h-raylib-6.1.0.0: raylib/src/external/rlsw.h
/**********************************************************************************************
*
* rlsw v1.6 - An OpenGL 1.1-style software renderer implementation
*
* DESCRIPTION:
* rlsw is a custom OpenGL 1.1-style implementation on software, intended to provide all
* functionality available on rlgl.h library used by raylib, becoming a direct software
* rendering replacement for OpenGL 1.1 backend and allowing to run raylib on GPU-less
* devices when required
*
* FEATURES:
* - Rendering to custom internal framebuffer with multiple color modes supported:
* - Color buffer: RGB - 8-bit (3:3:2) | RGB - 16-bit (5:6:5) | RGB - 24-bit (8:8:8)
* - Depth buffer: D - 8-bit (unorm) | D - 16-bit (unorm) | D - 24-bit (unorm)
* - Rendering modes supported: POINT, LINES, TRIANGLE, QUADS
* - Additional features: Polygon modes, Point width, Line width
* - Clipping support for all rendering modes
* - Texture features supported:
* - All uncompressed texture formats supported by raylib
* - Texture Minification/Magnification checks
* - Point and Bilinear filtering
* - Texture Wrap Modes with separate checks for S/T coordinates
* - Vertex Arrays support with direct primitive drawing mode
* - Matrix Stack support (Matrix Push/Pop)
* - Other GL misc features:
* - GL-style getter functions
* - Framebuffer resizing
* - Perspective correction
* - Scissor clipping
* - Depth testing
* - Blend modes
* - Face culling
*
* ADDITIONAL NOTES:
* Check PR for more info: https://github.com/raysan5/raylib/pull/4832
*
* CONFIGURATION:
* #define RLSW_IMPLEMENTATION
* Generates the implementation of the library into the included file
* If not defined, the library is in header only mode and can be included in other headers
* or source files without problems. But only ONE file should hold the implementation
*
* #define RLSW_USE_SIMD_INTRINSICS
* Detect and use SIMD intrinsics on the host compilation platform
* SIMD could improve rendering considerable vectorizing some raster operations
* but the target platforms running the compiled program with SIMD enabled
* must support the SIMD the program has been built for, making them only
* recommended under specific situations and only if the developers know
* what are they doing; this flag is not defined by default
*
* rlsw capabilities could be customized defining some internal
* values before library inclusion (default values listed):
*
* #define RLSW_FRAMEBUFFER_OUTPUT_BGRA true
* #define RLSW_FRAMEBUFFER_COLOR_TYPE R8G8B8A8
* #define RLSW_FRAMEBUFFER_DEPTH_TYPE D32
* #define RLSW_MAX_PROJECTION_STACK_SIZE 2
* #define RLSW_MAX_MODELVIEW_STACK_SIZE 8
* #define RLSW_MAX_TEXTURE_STACK_SIZE 2
* #define RLSW_MAX_TEXTURES 128
* #define RLSW_DOUBLE_BUFFERING 0
*
*
* LICENSE: MIT
*
* Copyright (c) 2025-2026 Le Juez Victor (@Bigfoot71), reviewed by Ramon Santamaria (@raysan5)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
**********************************************************************************************/
#ifndef RLSW_H
#define RLSW_H
#define RLSW_VERSION "1.6"
#include <stdbool.h>
#include <stdint.h>
//----------------------------------------------------------------------------------
// RLSW Configuration
//----------------------------------------------------------------------------------
#ifndef RLSW_FRAMEBUFFER_OUTPUT_BGRA
#define RLSW_FRAMEBUFFER_OUTPUT_BGRA true
#endif
#ifndef RLSW_FRAMEBUFFER_COLOR_TYPE
#define RLSW_FRAMEBUFFER_COLOR_TYPE R8G8B8A8 // Or R5G6B5, R3G3B2, etc; see `sw_pixelformat_t`
#endif
#ifndef RLSW_FRAMEBUFFER_DEPTH_TYPE
#define RLSW_FRAMEBUFFER_DEPTH_TYPE D32 // Or D16, D8
#endif
#ifndef RLSW_MAX_PROJECTION_STACK_SIZE
#define RLSW_MAX_PROJECTION_STACK_SIZE 2
#endif
#ifndef RLSW_MAX_MODELVIEW_STACK_SIZE
#define RLSW_MAX_MODELVIEW_STACK_SIZE 8
#endif
#ifndef RLSW_MAX_TEXTURE_STACK_SIZE
#define RLSW_MAX_TEXTURE_STACK_SIZE 2
#endif
#ifndef RLSW_MAX_FRAMEBUFFERS
#define RLSW_MAX_FRAMEBUFFERS 8
#endif
#ifndef RLSW_MAX_TEXTURES
#define RLSW_MAX_TEXTURES 128
#endif
#ifndef RLSW_DOUBLE_BUFFERING
#define RLSW_DOUBLE_BUFFERING 0
#endif
// Enable the use of a lookup table for uint8_t to float conversion
// Requires an additional 1KB of global memory
// Disabled when SIMD intrinsics are enabled
#ifndef RLSW_USE_COLOR_LUT
#if RLSW_USE_SIMD_INTRINSICS
#define RLSW_USE_COLOR_LUT false
#else
#define RLSW_USE_COLOR_LUT true
#endif
#endif
// Full NPOT texture support (enabled by default)
// When disabled, SW_REPEAT requires POT on its axis (fast bitmask wrap)
// SW_CLAMP remains supported for any dimension, per-axis
#ifndef RLSW_SUPPORT_NPOT_TEXTURE
# define RLSW_SUPPORT_NPOT_TEXTURE true
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
// Function specifiers definition
#ifndef SWAPI
#define SWAPI // Functions defined as 'extern' by default (implicit specifiers)
#endif
#ifndef SW_MALLOC
#define SW_MALLOC(sz) malloc(sz)
#endif
#ifndef SW_CALLOC
#define SW_CALLOC(n,sz) calloc(n,sz)
#endif
#ifndef SW_REALLOC
#define SW_REALLOC(ptr, newSz) realloc(ptr, newSz)
#endif
#ifndef SW_FREE
#define SW_FREE(ptr) free(ptr)
#endif
#ifndef SW_RESTRICT
#ifdef _MSC_VER
#define SW_RESTRICT __restrict
#else
#define SW_RESTRICT restrict
#endif
#endif
//----------------------------------------------------------------------------------
// OpenGL Compatibility Types
//----------------------------------------------------------------------------------
typedef unsigned int GLenum;
typedef unsigned char GLboolean;
typedef unsigned int GLbitfield;
typedef void GLvoid;
typedef signed char GLbyte;
typedef short GLshort;
typedef int GLint;
typedef unsigned char GLubyte;
typedef unsigned short GLushort;
typedef unsigned int GLuint;
typedef int GLsizei;
typedef float GLfloat;
typedef float GLclampf;
typedef double GLdouble;
typedef double GLclampd;
//----------------------------------------------------------------------------------
// OpenGL Definitions
// NOTE: Not used/supported definitions are commented
//----------------------------------------------------------------------------------
#define GL_FALSE 0
#define GL_TRUE 1
#define GL_SCISSOR_TEST 0x0C11
#define GL_TEXTURE_2D 0x0DE1
#define GL_DEPTH_TEST 0x0B71
#define GL_CULL_FACE 0x0B44
#define GL_BLEND 0x0BE2
#define GL_VENDOR 0x1F00
#define GL_RENDERER 0x1F01
#define GL_VERSION 0x1F02
#define GL_EXTENSIONS 0x1F03
#define GL_SHADING_LANGUAGE_VERSION 0x8B8C
//#define GL_ATTRIB_STACK_DEPTH 0x0BB0
//#define GL_CLIENT_ATTRIB_STACK_DEPTH 0x0BB1
#define GL_COLOR_CLEAR_VALUE 0x0C22
#define GL_DEPTH_CLEAR_VALUE 0x0B73
//#define GL_COLOR_WRITEMASK 0x0C23
//#define GL_CURRENT_INDEX 0x0B01
#define GL_CURRENT_COLOR 0x0B00
//#define GL_CURRENT_NORMAL 0x0B02
//#define GL_CURRENT_RASTER_COLOR 0x0B04
//#define GL_CURRENT_RASTER_DISTANCE 0x0B09
//#define GL_CURRENT_RASTER_INDEX 0x0B05
//#define GL_CURRENT_RASTER_POSITION 0x0B07
//#define GL_CURRENT_RASTER_TEXTURE_COORDS 0x0B06
//#define GL_CURRENT_RASTER_POSITION_VALID 0x0B08
#define GL_CURRENT_TEXTURE_COORDS 0x0B03
#define GL_POINT_SIZE 0x0B11
#define GL_LINE_WIDTH 0x0B21
//#define GL_INDEX_CLEAR_VALUE 0x0C20
//#define GL_INDEX_MODE 0x0C30
//#define GL_INDEX_WRITEMASK 0x0C21
#define GL_MODELVIEW_MATRIX 0x0BA6
#define GL_MODELVIEW_STACK_DEPTH 0x0BA3
//#define GL_NAME_STACK_DEPTH 0x0D70
#define GL_PROJECTION_MATRIX 0x0BA7
#define GL_PROJECTION_STACK_DEPTH 0x0BA4
//#define GL_RENDER_MODE 0x0C40
//#define GL_RGBA_MODE 0x0C31
#define GL_TEXTURE_MATRIX 0x0BA8
#define GL_TEXTURE_STACK_DEPTH 0x0BA5
#define GL_VIEWPORT 0x0BA2
#define GL_COLOR_BUFFER_BIT 0x00004000
#define GL_DEPTH_BUFFER_BIT 0x00000100
#define GL_MODELVIEW 0x1700
#define GL_PROJECTION 0x1701
#define GL_TEXTURE 0x1702
#define GL_VERTEX_ARRAY 0x8074
#define GL_NORMAL_ARRAY 0x8075 // WARNING: Not implemented (defined for RLGL)
#define GL_COLOR_ARRAY 0x8076
//#define GL_INDEX_ARRAY 0x8077
#define GL_TEXTURE_COORD_ARRAY 0x8078
#define GL_POINTS 0x0000
#define GL_LINES 0x0001
//#define GL_LINE_LOOP 0x0002
//#define GL_LINE_STRIP 0x0003
#define GL_TRIANGLES 0x0004
//#define GL_TRIANGLE_STRIP 0x0005
//#define GL_TRIANGLE_FAN 0x0006
#define GL_QUADS 0x0007
//#define GL_QUAD_STRIP 0x0008
//#define GL_POLYGON 0x0009
#define GL_POINT 0x1B00
#define GL_LINE 0x1B01
#define GL_FILL 0x1B02
#define GL_FRONT 0x0404
#define GL_BACK 0x0405
#define GL_ZERO 0
#define GL_ONE 1
#define GL_SRC_COLOR 0x0300
#define GL_ONE_MINUS_SRC_COLOR 0x0301
#define GL_SRC_ALPHA 0x0302
#define GL_ONE_MINUS_SRC_ALPHA 0x0303
#define GL_DST_ALPHA 0x0304
#define GL_ONE_MINUS_DST_ALPHA 0x0305
#define GL_DST_COLOR 0x0306
#define GL_ONE_MINUS_DST_COLOR 0x0307
#define GL_SRC_ALPHA_SATURATE 0x0308
#define GL_NEAREST 0x2600
#define GL_LINEAR 0x2601
#define GL_REPEAT 0x2901
#define GL_CLAMP 0x2900
#define GL_TEXTURE_MAG_FILTER 0x2800
#define GL_TEXTURE_MIN_FILTER 0x2801
#define GL_TEXTURE_WRAP_S 0x2802
#define GL_TEXTURE_WRAP_T 0x2803
#define GL_NO_ERROR 0
#define GL_INVALID_ENUM 0x0500
#define GL_INVALID_VALUE 0x0501
#define GL_INVALID_OPERATION 0x0502
#define GL_STACK_OVERFLOW 0x0503
#define GL_STACK_UNDERFLOW 0x0504
#define GL_OUT_OF_MEMORY 0x0505
#define GL_ALPHA 0x1906
#define GL_LUMINANCE 0x1909
#define GL_LUMINANCE_ALPHA 0x190A
#define GL_RGB 0x1907
#define GL_RGBA 0x1908
#define GL_DEPTH_COMPONENT 0x1902
#define GL_BYTE 0x1400
#define GL_UNSIGNED_BYTE 0x1401
#define GL_SHORT 0x1402
#define GL_UNSIGNED_SHORT 0x1403
#define GL_INT 0x1404
#define GL_UNSIGNED_INT 0x1405
#define GL_FLOAT 0x1406
#define GL_UNSIGNED_BYTE_3_3_2 0x8032
#define GL_UNSIGNED_SHORT_5_6_5 0x8363
#define GL_UNSIGNED_SHORT_4_4_4_4 0x8033
#define GL_UNSIGNED_SHORT_5_5_5_1 0x8034
// OpenGL internal formats (not all are supported; see SWinternalformat)
#define GL_ALPHA4 0x803B
#define GL_ALPHA8 0x803C
#define GL_ALPHA12 0x803D
#define GL_ALPHA16 0x803E
#define GL_LUMINANCE4 0x803F
#define GL_LUMINANCE8 0x8040
#define GL_LUMINANCE12 0x8041
#define GL_LUMINANCE16 0x8042
#define GL_LUMINANCE4_ALPHA4 0x8043
#define GL_LUMINANCE6_ALPHA2 0x8044
#define GL_LUMINANCE8_ALPHA8 0x8045
#define GL_LUMINANCE12_ALPHA4 0x8046
#define GL_LUMINANCE12_ALPHA12 0x8047
#define GL_LUMINANCE16_ALPHA16 0x8048
#define GL_INTENSITY 0x8049
#define GL_INTENSITY4 0x804A
#define GL_INTENSITY8 0x804B
#define GL_INTENSITY12 0x804C
#define GL_INTENSITY16 0x804D
#define GL_R3_G3_B2 0x2A10
#define GL_RGB4 0x804F
#define GL_RGB5 0x8050
#define GL_RGB8 0x8051
#define GL_RGB10 0x8052
#define GL_RGB12 0x8053
#define GL_RGB16 0x8054
#define GL_RGBA2 0x8055
#define GL_RGBA4 0x8056
#define GL_RGB5_A1 0x8057
#define GL_RGBA8 0x8058
#define GL_RGB10_A2 0x8059
#define GL_RGBA12 0x805A
#define GL_RGBA16 0x805B
// OpenGL internal formats extension
#define GL_DEPTH_COMPONENT16 0x81A5
#define GL_DEPTH_COMPONENT24 0x81A6
#define GL_DEPTH_COMPONENT32 0x81A7
#define GL_DEPTH_COMPONENT32F 0x8CAC
#define GL_R16F 0x822D
#define GL_RGB16F 0x881B
#define GL_RGBA16F 0x881A
#define GL_R32F 0x822E
#define GL_RGB32F 0x8815
#define GL_RGBA32F 0x8814
// OpenGL GL_EXT_framebuffer_object
#define GL_DRAW_FRAMEBUFFER_BINDING 0x8CA6
#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE 0x8CD0
#define GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME 0x8CD1
#define GL_FRAMEBUFFER_COMPLETE 0x8CD5
#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT 0x8CD6
#define GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
#define GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS 0x8CD9
#define GL_FRAMEBUFFER_UNSUPPORTED 0x8CDD
#define GL_COLOR_ATTACHMENT0 0x8CE0
#define GL_DEPTH_ATTACHMENT 0x8D00
#define GL_STENCIL_ATTACHMENT 0x8D20 // WARNING: Not implemented (defined for RLGL)
// OpenGL Definitions NOT USED
#define GL_PERSPECTIVE_CORRECTION_HINT 0x0C50
#define GL_PACK_ALIGNMENT 0x0D05
#define GL_UNPACK_ALIGNMENT 0x0CF5
#define GL_LINE_SMOOTH 0x0B20
#define GL_SMOOTH 0x1D01
#define GL_NICEST 0x1102
#define GL_CCW 0x0901
#define GL_CW 0x0900
#define GL_NEVER 0x0200
#define GL_LESS 0x0201
#define GL_EQUAL 0x0202
#define GL_LEQUAL 0x0203
#define GL_GREATER 0x0204
#define GL_NOTEQUAL 0x0205
#define GL_GEQUAL 0x0206
#define GL_ALWAYS 0x0207
#define GL_RENDERBUFFER 0x8D41
#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516
#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518
#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A
#define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517
#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519
//----------------------------------------------------------------------------------
// OpenGL Bindings to rlsw
//----------------------------------------------------------------------------------
#define glReadPixels(x, y, w, h, f, t, p) swReadPixels((x), (y), (w), (h), (f), (t), (p))
#define glEnable(state) swEnable((state))
#define glDisable(state) swDisable((state))
#define glGetIntegerv(pname, params) swGetIntegerv((pname), (params))
#define glGetFloatv(pname, params) swGetFloatv((pname), (params))
#define glGetString(pname) swGetString((pname))
#define glGetError() swGetError()
#define glViewport(x, y, w, h) swViewport((x), (y), (w), (h))
#define glScissor(x, y, w, h) swScissor((x), (y), (w), (h))
#define glClearColor(r, g, b, a) swClearColor((r), (g), (b), (a))
#define glClearDepth(d) swClearDepth((d))
#define glClear(bitmask) swClear((bitmask))
#define glBlendFunc(sfactor, dfactor) swBlendFunc((sfactor), (dfactor))
#define glPolygonMode(face, mode) swPolygonMode((mode))
#define glCullFace(face) swCullFace((face))
#define glPointSize(size) swPointSize((size))
#define glLineWidth(width) swLineWidth((width))
#define glMatrixMode(mode) swMatrixMode((mode))
#define glPushMatrix() swPushMatrix()
#define glPopMatrix() swPopMatrix()
#define glLoadIdentity() swLoadIdentity()
#define glTranslatef(x, y, z) swTranslatef((x), (y), (z))
#define glRotatef(a, x, y, z) swRotatef((a), (x), (y), (z))
#define glScalef(x, y, z) swScalef((x), (y), (z))
#define glMultMatrixf(v) swMultMatrixf((v))
#define glFrustum(l, r, b, t, n, f) swFrustum((l), (r), (b), (t), (n), (f))
#define glOrtho(l, r, b, t, n, f) swOrtho((l), (r), (b), (t), (n), (f))
#define glBegin(mode) swBegin((mode))
#define glEnd() swEnd()
#define glVertex2i(x, y) swVertex2i((x), (y))
#define glVertex2f(x, y) swVertex2f((x), (y))
#define glVertex2fv(v) swVertex2fv((v))
#define glVertex3i(x, y, z) swVertex3i((x), (y), (z))
#define glVertex3f(x, y, z) swVertex3f((x), (y), (z))
#define glvertex3fv(v) swVertex3fv((v))
#define glVertex4i(x, y, z, w) swVertex4i((x), (y), (z), (w))
#define glVertex4f(x, y, z, w) swVertex4f((x), (y), (z), (w))
#define glVertex4fv(v) swVertex4fv((v))
#define glColor3ub(r, g, b) swColor3ub((r), (g), (b))
#define glColor3ubv(v) swColor3ubv((v))
#define glColor3f(r, g, b) swColor3f((r), (g), (b))
#define glColor3fv(v) swColor3fv((v))
#define glColor4ub(r, g, b, a) swColor4ub((r), (g), (b), (a))
#define glColor4ubv(v) swColor4ubv((v))
#define glColor4f(r, g, b, a) swColor4f((r), (g), (b), (a))
#define glColor4fv(v) swColor4fv((v))
#define glTexCoord2f(u, v) swTexCoord2f((u), (v))
#define glTexCoord2fv(v) swTexCoord2fv((v))
#define glEnableClientState(t) ((void)(t))
#define glDisableClientState(t) swBindArray((t), 0)
#define glVertexPointer(sz, t, s, p) swBindArray(SW_VERTEX_ARRAY, (p))
#define glTexCoordPointer(sz, t, s, p) swBindArray(SW_TEXTURE_COORD_ARRAY, (p))
#define glColorPointer(sz, t, s, p) swBindArray(SW_COLOR_ARRAY, (p))
#define glDrawArrays(m, o, c) swDrawArrays((m), (o), (c))
#define glDrawElements(m,c,t,i) swDrawElements((m),(c),(t),(i))
#define glGenTextures(c, v) swGenTextures((c), (v))
#define glDeleteTextures(c, v) swDeleteTextures((c), (v))
#define glBindTexture(tr, id) swBindTexture((id))
#define glTexImage2D(tr, l, if, w, h, b, f, t, p) swTexImage2D((w), (h), (f), (t), (p))
#define glTexSubImage2D(tr, l, x, y, w, h, f, t, p) swTexSubImage2D((x), (y), (w), (h), (f), (t), (p));
#define glTexParameteri(tr, pname, param) swTexParameteri((pname), (param))
// OpenGL GL_EXT_framebuffer_object
#define glGenFramebuffers(c, v) swGenFramebuffers((c), (v))
#define glDeleteFramebuffers(c, v) swDeleteFramebuffers((c), (v))
#define glBindFramebuffer(tr, id) swBindFramebuffer((id))
#define glFramebufferTexture2D(tr, a, t, tex, ml) swFramebufferTexture2D((a), (tex))
#define glFramebufferRenderbuffer(tr, a, rbtr, rb) swFramebufferTexture2D((a), (rb))
#define glCheckFramebufferStatus(tr) swCheckFramebufferStatus()
#define glGetFramebufferAttachmentParameteriv(tr, a, p, v) swGetFramebufferAttachmentParameteriv((a), (p), (v))
#define glGenRenderbuffers(c, v) swGenTextures((c), (v))
#define glDeleteRenderbuffers(c, v) swDeleteTextures((c), (v))
#define glBindRenderbuffer(tr, rb) swBindTexture((rb))
#define glRenderbufferStorage(tr, f, w, h) swTexStorage2D((w), (h), (f))
// OpenGL functions NOT IMPLEMENTED by rlsw
#define glDepthMask(X) ((void)(X))
#define glColorMask(X,Y,Z,W) ((void)(X),(void)(Y),(void)(Z),(void)(W))
#define glPixelStorei(X,Y) ((void)(X),(void)(Y))
#define glHint(X,Y) ((void)(X),(void)(Y))
#define glShadeModel(X) ((void)(X))
#define glFrontFace(X) ((void)(X))
#define glDepthFunc(X) ((void)(X))
#define glGetTexImage(X,Y,Z,W,A) ((void)(X),(void)(Y),(void)(Z),(void)(W),(void)(A))
#define glNormal3f(X,Y,Z) ((void)(X),(void)(Y),(void)(Z))
#define glNormal3fv(X) ((void)(X))
#define glNormalPointer(X,Y,Z) ((void)(X),(void)(Y),(void)(Z))
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
typedef enum {
SW_SCISSOR_TEST = GL_SCISSOR_TEST,
SW_TEXTURE_2D = GL_TEXTURE_2D,
SW_DEPTH_TEST = GL_DEPTH_TEST,
SW_CULL_FACE = GL_CULL_FACE,
SW_BLEND = GL_BLEND
} SWstate;
typedef enum {
SW_VENDOR = GL_VENDOR,
SW_RENDERER = GL_RENDERER,
SW_VERSION = GL_VERSION,
SW_EXTENSIONS = GL_EXTENSIONS,
SW_SHADING_LANGUAGE_VERSION = GL_SHADING_LANGUAGE_VERSION,
SW_COLOR_CLEAR_VALUE = GL_COLOR_CLEAR_VALUE,
SW_DEPTH_CLEAR_VALUE = GL_DEPTH_CLEAR_VALUE,
SW_CURRENT_COLOR = GL_CURRENT_COLOR,
SW_CURRENT_TEXTURE_COORDS = GL_CURRENT_TEXTURE_COORDS,
SW_POINT_SIZE = GL_POINT_SIZE,
SW_LINE_WIDTH = GL_LINE_WIDTH,
SW_MODELVIEW_MATRIX = GL_MODELVIEW_MATRIX,
SW_MODELVIEW_STACK_DEPTH = GL_MODELVIEW_STACK_DEPTH,
SW_PROJECTION_MATRIX = GL_PROJECTION_MATRIX,
SW_PROJECTION_STACK_DEPTH = GL_PROJECTION_STACK_DEPTH,
SW_TEXTURE_MATRIX = GL_TEXTURE_MATRIX,
SW_TEXTURE_STACK_DEPTH = GL_TEXTURE_STACK_DEPTH,
SW_VIEWPORT = GL_VIEWPORT,
SW_DRAW_FRAMEBUFFER_BINDING = GL_DRAW_FRAMEBUFFER_BINDING,
} SWget;
typedef enum {
SW_COLOR_BUFFER_BIT = GL_COLOR_BUFFER_BIT,
SW_DEPTH_BUFFER_BIT = GL_DEPTH_BUFFER_BIT
} SWbuffer;
typedef enum {
SW_PROJECTION = GL_PROJECTION,
SW_MODELVIEW = GL_MODELVIEW,
SW_TEXTURE = GL_TEXTURE
} SWmatrix;
typedef enum {
SW_VERTEX_ARRAY = GL_VERTEX_ARRAY,
SW_TEXTURE_COORD_ARRAY = GL_TEXTURE_COORD_ARRAY,
SW_COLOR_ARRAY = GL_COLOR_ARRAY
} SWarray;
typedef enum {
SW_DRAW_INVALID = -1,
SW_POINTS = GL_POINTS,
SW_LINES = GL_LINES,
SW_TRIANGLES = GL_TRIANGLES,
SW_QUADS = GL_QUADS
} SWdraw;
typedef enum {
SW_POINT = GL_POINT,
SW_LINE = GL_LINE,
SW_FILL = GL_FILL
} SWpoly;
typedef enum {
SW_FRONT = GL_FRONT,
SW_BACK = GL_BACK,
} SWface;
typedef enum {
SW_ZERO = GL_ZERO,
SW_ONE = GL_ONE,
SW_SRC_COLOR = GL_SRC_COLOR,
SW_ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
SW_SRC_ALPHA = GL_SRC_ALPHA,
SW_ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA,
SW_DST_ALPHA = GL_DST_ALPHA,
SW_ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA,
SW_DST_COLOR = GL_DST_COLOR,
SW_ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR,
SW_SRC_ALPHA_SATURATE = GL_SRC_ALPHA_SATURATE
} SWfactor;
typedef enum {
SW_LUMINANCE = GL_LUMINANCE,
SW_LUMINANCE_ALPHA = GL_LUMINANCE_ALPHA,
SW_RGB = GL_RGB,
SW_RGBA = GL_RGBA,
SW_DEPTH_COMPONENT = GL_DEPTH_COMPONENT,
} SWformat;
typedef enum {
SW_UNSIGNED_BYTE = GL_UNSIGNED_BYTE,
SW_UNSIGNED_BYTE_3_3_2 = GL_UNSIGNED_BYTE_3_3_2,
SW_BYTE = GL_BYTE,
SW_UNSIGNED_SHORT = GL_UNSIGNED_SHORT,
SW_UNSIGNED_SHORT_5_6_5 = GL_UNSIGNED_SHORT_5_6_5,
SW_UNSIGNED_SHORT_4_4_4_4 = GL_UNSIGNED_SHORT_4_4_4_4,
SW_UNSIGNED_SHORT_5_5_5_1 = GL_UNSIGNED_SHORT_5_5_5_1,
SW_SHORT = GL_SHORT,
SW_UNSIGNED_INT = GL_UNSIGNED_INT,
SW_INT = GL_INT,
SW_FLOAT = GL_FLOAT
} SWtype;
typedef enum {
SW_LUMINANCE8 = GL_LUMINANCE8,
SW_LUMINANCE8_ALPHA8 = GL_LUMINANCE8_ALPHA8,
SW_R3_G3_B2 = GL_R3_G3_B2,
SW_RGB8 = GL_RGB8,
SW_RGBA4 = GL_RGBA4,
SW_RGB5_A1 = GL_RGB5_A1,
SW_RGBA8 = GL_RGBA8,
SW_R16F = GL_R16F,
SW_RGB16F = GL_RGB16F,
SW_RGBA16F = GL_RGBA16F,
SW_R32F = GL_R32F,
SW_RGB32F = GL_RGB32F,
SW_RGBA32F = GL_RGBA32F,
SW_DEPTH_COMPONENT16 = GL_DEPTH_COMPONENT16,
SW_DEPTH_COMPONENT24 = GL_DEPTH_COMPONENT24,
SW_DEPTH_COMPONENT32 = GL_DEPTH_COMPONENT32,
SW_DEPTH_COMPONENT32F = GL_DEPTH_COMPONENT32F,
//SW_R5_G6_B5, // Not defined by OpenGL
} SWinternalformat;
typedef enum {
SW_NEAREST = GL_NEAREST,
SW_LINEAR = GL_LINEAR
} SWfilter;
typedef enum {
SW_REPEAT = GL_REPEAT,
SW_CLAMP = GL_CLAMP,
} SWwrap;
typedef enum {
SW_TEXTURE_MIN_FILTER = GL_TEXTURE_MIN_FILTER,
SW_TEXTURE_MAG_FILTER = GL_TEXTURE_MAG_FILTER,
SW_TEXTURE_WRAP_S = GL_TEXTURE_WRAP_S,
SW_TEXTURE_WRAP_T = GL_TEXTURE_WRAP_T
} SWtexparam;
typedef enum {
SW_COLOR_ATTACHMENT = GL_COLOR_ATTACHMENT0,
SW_DEPTH_ATTACHMENT = GL_DEPTH_ATTACHMENT,
} SWattachment;
typedef enum {
SW_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME = GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
SW_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
} SWattachget;
typedef enum {
SW_FRAMEBUFFER_COMPLETE = GL_FRAMEBUFFER_COMPLETE,
SW_FRAMEBUFFER_INCOMPLETE_ATTACHMENT = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
SW_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
SW_FRAMEBUFFER_INCOMPLETE_DIMENSIONS = GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS,
} SWfbstatus;
typedef enum {
SW_NO_ERROR = GL_NO_ERROR,
SW_INVALID_ENUM = GL_INVALID_ENUM,
SW_INVALID_VALUE = GL_INVALID_VALUE,
SW_STACK_OVERFLOW = GL_STACK_OVERFLOW,
SW_STACK_UNDERFLOW = GL_STACK_UNDERFLOW,
SW_INVALID_OPERATION = GL_INVALID_OPERATION,
SW_OUT_OF_MEMORY = GL_OUT_OF_MEMORY,
} SWerrcode;
//------------------------------------------------------------------------------------
// Functions Declaration - Public API
//------------------------------------------------------------------------------------
SWAPI bool swInit(int w, int h);
SWAPI void swClose(void);
SWAPI bool swResize(int w, int h);
SWAPI void swReadPixels(int x, int y, int w, int h, SWformat format, SWtype type, void *pixels);
SWAPI void swBlitPixels(int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, SWformat format, SWtype type, void *pixels);
SWAPI void *swGetColorBuffer(int *width, int *height); // Restored for ESP-IDF compatibility
SWAPI void swSwapColorBuffers(void); // Swap software renderer color/back buffers by pointer only
SWAPI void swEnable(SWstate state);
SWAPI void swDisable(SWstate state);
SWAPI void swGetFloatv(SWget name, float *v);
SWAPI const char *swGetString(SWget name);
SWAPI SWerrcode swGetError(void);
SWAPI void swViewport(int x, int y, int width, int height);
SWAPI void swScissor(int x, int y, int width, int height);
SWAPI void swClearColor(float r, float g, float b, float a);
SWAPI void swClearDepth(float depth);
SWAPI void swClear(uint32_t bitmask);
SWAPI void swBlendFunc(SWfactor sfactor, SWfactor dfactor);
SWAPI void swPolygonMode(SWpoly mode);
SWAPI void swCullFace(SWface face);
SWAPI void swPointSize(float size);
SWAPI void swLineWidth(float width);
SWAPI void swMatrixMode(SWmatrix mode);
SWAPI void swPushMatrix(void);
SWAPI void swPopMatrix(void);
SWAPI void swLoadIdentity(void);
SWAPI void swTranslatef(float x, float y, float z);
SWAPI void swRotatef(float angle, float x, float y, float z);
SWAPI void swScalef(float x, float y, float z);
SWAPI void swMultMatrixf(const float *mat);
SWAPI void swFrustum(double left, double right, double bottom, double top, double znear, double zfar);
SWAPI void swOrtho(double left, double right, double bottom, double top, double znear, double zfar);
SWAPI void swBegin(SWdraw mode);
SWAPI void swEnd(void);
SWAPI void swVertex2i(int x, int y);
SWAPI void swVertex2f(float x, float y);
SWAPI void swVertex2fv(const float *v);
SWAPI void swVertex3i(int x, int y, int z);
SWAPI void swVertex3f(float x, float y, float z);
SWAPI void swVertex3fv(const float *v);
SWAPI void swVertex4i(int x, int y, int z, int w);
SWAPI void swVertex4f(float x, float y, float z, float w);
SWAPI void swVertex4fv(const float *v);
SWAPI void swColor3ub(uint8_t r, uint8_t g, uint8_t b);
SWAPI void swColor3ubv(const uint8_t *v);
SWAPI void swColor3f(float r, float g, float b);
SWAPI void swColor3fv(const float *v);
SWAPI void swColor4ub(uint8_t r, uint8_t g, uint8_t b, uint8_t a);
SWAPI void swColor4ubv(const uint8_t *v);
SWAPI void swColor4f(float r, float g, float b, float a);
SWAPI void swColor4fv(const float *v);
SWAPI void swTexCoord2f(float u, float v);
SWAPI void swTexCoord2fv(const float *v);
SWAPI void swBindArray(SWarray type, void *buffer);
SWAPI void swDrawArrays(SWdraw mode, int offset, int count);
SWAPI void swDrawElements(SWdraw mode, int count, int type, const void *indices);
SWAPI void swGenTextures(int count, uint32_t *textures);
SWAPI void swDeleteTextures(int count, uint32_t *textures);
SWAPI void swBindTexture(uint32_t id);
SWAPI void swTexImage2D(int width, int height, SWformat format, SWtype type, const void *data);
SWAPI void swTexSubImage2D(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *pixels);
SWAPI void swTexParameteri(int param, int value);
SWAPI void swGenFramebuffers(int count, uint32_t *framebuffers);
SWAPI void swDeleteFramebuffers(int count, uint32_t *framebuffers);
SWAPI void swBindFramebuffer(uint32_t id);
SWAPI void swFramebufferTexture2D(SWattachment attach, uint32_t texture);
SWAPI SWfbstatus swCheckFramebufferStatus(void);
SWAPI void swGetFramebufferAttachmentParameteriv(SWattachment attachment, SWattachget property, int *v);
#endif // RLSW_H
/***********************************************************************************
*
* RLSW IMPLEMENTATION
*
************************************************************************************/
#if defined(RLSW_IMPLEMENTATION)
#undef RLSW_IMPLEMENTATION // Undef to allow template expanding without implementation redefinition
#include <stdlib.h> // Required for: malloc(), free()
#include <stddef.h> // Required for: NULL, size_t, uint8_t, uint16_t, uint32_t...
#include <math.h> // Required for: sinf(), cosf(), floorf(), fabsf(), sqrtf(), roundf()
// Simple log system to avoid printf() calls if required
// NOTE: Avoiding those calls, also avoids const strings memory usage
#define RLSW_SUPPORT_LOG_INFO
#if defined(RLSW_SUPPORT_LOG_INFO)
#include <stdio.h>
#define SW_LOG(...) printf(__VA_ARGS__)
#else
#define SW_LOG(...)
#endif
#if defined(_MSC_VER)
#define SW_ALIGN(x) __declspec(align(x))
#elif defined(__GNUC__) || defined(__clang__)
#define SW_ALIGN(x) __attribute__((aligned(x)))
#else
#define SW_ALIGN(x) // Do nothing if not available
#endif
#if defined(NDEBUG)
#if defined(_MSC_VER)
#define SW_INLINE __forceinline
#elif defined(__GNUC__) || defined(__clang__)
#define SW_INLINE inline __attribute__((always_inline))
#else
#define SW_INLINE inline
#endif
#else
#define SW_INLINE inline
#endif
#if defined(_M_X64) || defined(__x86_64__)
#define SW_ARCH_X86_64
#elif defined(_M_IX86) || defined(__i386__)
#define SW_ARCH_X86
#elif defined(_M_ARM) || defined(__arm__)
#define SW_ARCH_ARM32
#elif defined(_M_ARM64) || defined(__aarch64__)
#define SW_ARCH_ARM64
#elif defined(__riscv)
#define SW_ARCH_RISCV
#endif
#if RLSW_USE_SIMD_INTRINSICS
// Check for SIMD vector instructions
// NOTE: Compiler is responsible to enable required flags for host device,
// supported features are detected at compiler init but varies depending on compiler
// TODO: This logic must be reviewed to avoid the inclusion of multiple headers
// and enable the higher level of SIMD available
#if defined(__FMA__) && defined(__AVX2__)
#define SW_HAS_FMA_AVX2
#include <immintrin.h>
#elif defined(__FMA__) && defined(__AVX__)
#define SW_HAS_FMA_AVX
#include <immintrin.h>
#elif defined(__AVX2__)
#define SW_HAS_AVX2
#include <immintrin.h>
#elif defined(__AVX__)
#define SW_HAS_AVX
#include <immintrin.h>
#endif
#if defined(__SSE4_2__)
#define SW_HAS_SSE42
#include <nmmintrin.h>
#elif defined(__SSE4_1__)
#define SW_HAS_SSE41
#include <smmintrin.h>
#elif defined(__SSSE3__)
#define SW_HAS_SSSE3
#include <tmmintrin.h>
#elif defined(__SSE3__)
#define SW_HAS_SSE3
#include <pmmintrin.h>
#elif defined(__SSE2__) || (defined(_M_AMD64) || defined(_M_X64)) // SSE2 x64
#define SW_HAS_SSE2
#include <emmintrin.h>
#elif defined(__SSE__)
#define SW_HAS_SSE
#include <xmmintrin.h>
#endif
#if defined(__ARM_NEON) || defined(__aarch64__)
#if defined(__ARM_FEATURE_FMA)
#define SW_HAS_NEON_FMA
#else
#define SW_HAS_NEON
#endif
#include <arm_neon.h>
#endif
#if defined(__riscv_vector)
// NOTE: Requires compilation flags: -march=rv64gcv -mabi=lp64d
#define SW_HAS_RVV
#include <riscv_vector.h>
#endif
#endif
// ESP-DSP acceleration: ESP-IDF ships an optimized math library that includes
// `dspm_mult_4x4x4_f32` (4x4 matrix multiply) and `dspm_mult_4x4x1_f32` (matrix * vector)
// These are S3-tuned hand-vectorized kernels that beat the scalar versions for both throughput and code-size
// Detection is opt-in to keep the dependency optional: define SW_USE_ESP_DSP from your build system
#if defined(ESP_PLATFORM) && defined(SW_USE_ESP_DSP)
#define SW_HAS_ESP_DSP
#include "dspm_mult.h"
#endif
#ifdef __cplusplus
#define SW_CURLY_INIT(name) name
#else
#define SW_CURLY_INIT(name) (name)
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#define SW_PI 3.14159265358979323846f
#define SW_INV_255 0.00392156862745098f // 1.0f/255.0f
#define SW_DEG2RAD (SW_PI/180.0f)
#define SW_RAD2DEG (180.0f/SW_PI)
// When clipping a convex polygon against a plane, at most one vertex is added
// Starting from a quadrilateral (4 vertices), clipped sequentially against
// the frustum (6 planes) then the scissor rectangle (4 planes):
// 4 + 6 + 4 = 14 vertices maximum
#define SW_MAX_CLIPPED_POLYGON_VERTICES 14
#define SW_CLIP_EPSILON 1e-4f
#define SW_HANDLE_NULL 0u
#define SW_POOL_SLOT_LIVE 0x80u // bit7 of the generation byte
#define SW_POOL_SLOT_VER_MASK 0x7Fu // bits6:0 = anti-ABA counter
#define SW_CONCAT(a, b) a##b
#define SW_CONCATX(a, b) SW_CONCAT(a, b)
#define SW_FRAMEBUFFER_COLOR8_GET(c,p,o) SW_CONCATX(sw_pixel_read_color8_, RLSW_FRAMEBUFFER_COLOR_TYPE)((c),(p),(o))
#define SW_FRAMEBUFFER_COLOR_GET(c,p,o) SW_CONCATX(sw_pixel_read_color_, RLSW_FRAMEBUFFER_COLOR_TYPE)((c),(p),(o))
#define SW_FRAMEBUFFER_COLOR_SET(p,c,o) SW_CONCATX(sw_pixel_write_color_, RLSW_FRAMEBUFFER_COLOR_TYPE)((p),(c),(o))
#define SW_FRAMEBUFFER_DEPTH_GET(p,o) SW_CONCATX(sw_pixel_read_depth_, RLSW_FRAMEBUFFER_DEPTH_TYPE)((p),(o))
#define SW_FRAMEBUFFER_DEPTH_SET(p,d,o) SW_CONCATX(sw_pixel_write_depth_, RLSW_FRAMEBUFFER_DEPTH_TYPE)((p),(d),(o))
#define SW_FRAMEBUFFER_COLOR_FORMAT SW_CONCATX(SW_PIXELFORMAT_COLOR_, RLSW_FRAMEBUFFER_COLOR_TYPE)
#define SW_FRAMEBUFFER_DEPTH_FORMAT SW_CONCATX(SW_PIXELFORMAT_DEPTH_, RLSW_FRAMEBUFFER_DEPTH_TYPE)
#define SW_FRAMEBUFFER_COLOR_SIZE SW_PIXELFORMAT_SIZE[SW_FRAMEBUFFER_COLOR_FORMAT]
#define SW_FRAMEBUFFER_DEPTH_SIZE SW_PIXELFORMAT_SIZE[SW_FRAMEBUFFER_DEPTH_FORMAT]
#define SW_STATE_NONE 0 /* Pseudo state used for the rasterizer variant with no pipeline state enabled */
#define SW_STATE_SCISSOR_TEST (1 << 0)
#define SW_STATE_COLOR_INTERP (1 << 1)
#define SW_STATE_TEXTURE_2D (1 << 2)
#define SW_STATE_DEPTH_TEST (1 << 3)
#define SW_STATE_CULL_FACE (1 << 4)
#define SW_STATE_BLEND (1 << 5)
#define SW_BLEND_FLAG_NOOP (1 << 0)
#define SW_BLEND_FLAG_NEEDS_ALPHA (1 << 1)
//----------------------------------------------------------------------------------
// Module Types and Structures Definition
//----------------------------------------------------------------------------------
// Aliases types
typedef uint32_t sw_handle_t;
typedef uint16_t sw_half_t;
// Pixel data format type
typedef enum {
SW_PIXELFORMAT_UNKNOWN = 0,
SW_PIXELFORMAT_COLOR_GRAYSCALE, // 8 bit per pixel (no alpha)
SW_PIXELFORMAT_COLOR_GRAYALPHA, // 8*2 bpp (2 channels)
SW_PIXELFORMAT_COLOR_R3G3B2, // 8 bpp
SW_PIXELFORMAT_COLOR_R5G6B5, // 16 bpp
SW_PIXELFORMAT_COLOR_R8G8B8, // 24 bpp
SW_PIXELFORMAT_COLOR_R5G5B5A1, // 16 bpp (1 bit alpha)
SW_PIXELFORMAT_COLOR_R4G4B4A4, // 16 bpp (4 bit alpha)
SW_PIXELFORMAT_COLOR_R8G8B8A8, // 32 bpp
SW_PIXELFORMAT_COLOR_R32, // 32 bpp (1 channel - float)
SW_PIXELFORMAT_COLOR_R32G32B32, // 32*3 bpp (3 channels - float)
SW_PIXELFORMAT_COLOR_R32G32B32A32, // 32*4 bpp (4 channels - float)
SW_PIXELFORMAT_COLOR_R16, // 16 bpp (1 channel - half float)
SW_PIXELFORMAT_COLOR_R16G16B16, // 16*3 bpp (3 channels - half float)
SW_PIXELFORMAT_COLOR_R16G16B16A16, // 16*4 bpp (4 channels - half float)
SW_PIXELFORMAT_DEPTH_D8, // 1 bpp
SW_PIXELFORMAT_DEPTH_D16, // 2 bpp
SW_PIXELFORMAT_DEPTH_D32, // 4 bpp
SW_PIXELFORMAT_COUNT
} sw_pixelformat_t;
typedef enum {
SW_PIXEL_ALPHA_NONE = 0, // No transparency
SW_PIXEL_ALPHA_BIN, // Binary transparency
SW_PIXEL_ALPHA_YES, // Contains transparency
} sw_pixel_alpha_t;
// Forward declarations
typedef struct sw_texture sw_texture_t;
typedef struct sw_vertex sw_vertex_t;
// Pixel getter functions
typedef void (*sw_pixel_read_color8_f)(uint8_t *SW_RESTRICT, const void *SW_RESTRICT, uint32_t);
typedef void (*sw_pixel_read_color_f)(float *SW_RESTRICT, const void *SW_RESTRICT, uint32_t);
// Pixel setter functions
typedef void (*sw_pixel_write_color8_f)(void *SW_RESTRICT, const uint8_t *SW_RESTRICT, uint32_t);
typedef void (*sw_pixel_write_color_f)(void *SW_RESTRICT, const float *SW_RESTRICT, uint32_t);
// Texture sampler function
typedef void (*sw_texture_sampler_f)(float *SW_RESTRICT, const sw_texture_t *SW_RESTRICT, float, float);
// Color blending function
typedef void (*sw_blend_f)(float *SW_RESTRICT, const float *SW_RESTRICT);
// Rasterizer functions
typedef void (*sw_raster_triangle_f)(const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*);
typedef void (*sw_raster_quad_f)(const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*);
typedef void (*sw_raster_line_f)(const sw_vertex_t*, const sw_vertex_t*);
typedef void (*sw_raster_point_f)(const sw_vertex_t*);
typedef float sw_matrix_t[4*4];
typedef struct sw_vertex {
float position[4]; // Clip space (x,y,z,w) -> NDC (after /w) -> screen space (x,y,z,1/w)
float color[4]; // Color value (RGBA)
float texcoord[2]; // Texture coordinates
} sw_vertex_t;
typedef struct sw_texture {
void *pixels; // Texture pixels
sw_pixel_read_color8_f readColor8; // Texel read RGBA8
sw_pixel_read_color_f readColor; // Texel read RGBA32F
sw_pixelformat_t format; // Texture format
sw_pixel_alpha_t alpha; // Texture alpha mode
int width, height; // Dimensions of the texture
int wMinus1, hMinus1; // Dimensions minus one
int allocSz; // Allocated size
SWfilter minFilter; // Minification filter
SWfilter magFilter; // Magnification filter
SWwrap sWrap; // Wrap mode for texcoord.x
SWwrap tWrap; // Wrap mode for texcoord.y
float tx; // Texel width
float ty; // Texel height
} sw_texture_t;
typedef struct {
sw_texture_t color; // Default framebuffer color texture
#if RLSW_DOUBLE_BUFFERING
sw_texture_t backColor; // Back buffer for multicore.
#endif
sw_texture_t depth; // Default framebuffer depth texture
} sw_default_framebuffer_t;
typedef struct {
sw_handle_t colorAttachment; // Framebuffer color attachment id
sw_handle_t depthAttachment; // Framebuffer depth attachment id
} sw_framebuffer_t;
typedef struct {
void *data; // Flat storage [capacity*stride] bytes
uint8_t *gen; // Generation per slot [capacity]
uint32_t *freeList; // Free indices stack [capacity]
int freeCount;
int watermark; // Next blank index (starts at 1, skips 0)
int capacity;
size_t stride;
} sw_pool_t;
// Graphic context data structure
typedef struct {
sw_default_framebuffer_t framebuffer; // Default framebuffer
float clearColor[4]; // Clear color of the framebuffer
float clearDepth; // Clear depth of the framebuffer
float vpCenter[2]; // Viewport center
float vpHalf[2]; // Viewport half dimensions
int vpSize[2]; // Viewport dimensions
int scMin[2]; // Scissor rectangle minimum renderable point (top-left)
int scMax[2]; // Scissor rectangle maximum renderable point (bottom-right)
float scClipMin[2]; // Scissor rectangle minimum renderable point in clip space
float scClipMax[2]; // Scissor rectangle maximum renderable point in clip space
struct {
sw_vertex_t buffer[SW_MAX_CLIPPED_POLYGON_VERTICES]; // Buffer used for storing primitive vertices, used for processing and rendering
int vertexCount; // Number of vertices in the primtive buffer
float color[4]; // Current color for the next pushed vertex
float texcoord[2]; // Current texture coordinates for the next push vertex
bool hasColorAlpha; // Flag indicating whether the current primitive contains transparency
} primitive;
struct {
float *positions;
float *texcoords;
uint8_t *colors;
} array;
SWdraw drawMode; // Current primitive mode (e.g., lines, triangles)
SWpoly polyMode; // Current polygon filling mode (e.g., lines, triangles)
float pointRadius; // Rasterized point radius
float lineWidth; // Rasterized line width
sw_matrix_t stackProjection[RLSW_MAX_PROJECTION_STACK_SIZE]; // Projection matrix stack for push/pop operations
sw_matrix_t stackModelview[RLSW_MAX_MODELVIEW_STACK_SIZE]; // Modelview matrix stack for push/pop operations
sw_matrix_t stackTexture[RLSW_MAX_TEXTURE_STACK_SIZE]; // Texture matrix stack for push/pop operations
uint32_t stackProjectionCounter; // Counter for matrix stack operations
uint32_t stackModelviewCounter; // Counter for matrix stack operations
uint32_t stackTextureCounter; // Counter for matrix stack operations
SWmatrix currentMatrixMode; // Current matrix mode (e.g., sw_MODELVIEW, sw_PROJECTION)
sw_matrix_t *currentMatrix; // Pointer to the currently used matrix according to the mode
sw_matrix_t matMVP; // Model view projection matrix, calculated and used internally
#ifdef SW_HAS_ESP_DSP
float matMVP_rm[16]; // Row-major MVP, kept in sync for esp-dsp dspm_mult_4x4x1_f32 vertex transform
#endif
bool isDirtyMVP; // Indicates if the MVP matrix should be rebuilt
sw_handle_t boundFramebufferId; // Framebuffer currently bound
sw_texture_t *colorBuffer; // Color buffer currently bound
// NOTE: don't need backBuffer because it's already in the sw_default_framebuffer_t struct.
sw_texture_t *depthBuffer; // Depth buffer currently bound
sw_pool_t framebufferPool; // Framebuffer object pool
sw_texture_t *boundTexture; // Texture currently bound
sw_pool_t texturePool; // Texture object pool
SWfactor srcFactor; // Source blending factor
SWfactor dstFactor; // Destination bleending factor
uint32_t blendFlags; // Flags about the current blend mode
sw_blend_f blendFunc; // Source blend function
SWface cullFace; // Faces to cull
SWerrcode errCode; // Last error code
uint32_t userState; // User-defined pipeline state
uint32_t rasterState; // Cleaned pipeline state for the rasterizer
} sw_context_t;
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
static sw_context_t RLSW = { 0 };
#if RLSW_USE_COLOR_LUT
static float SW_LUT_UINT8_TO_FLOAT[256] = { 0 };
#endif
//----------------------------------------------------------------------------------
// Internal Constants Definition
//----------------------------------------------------------------------------------
// Pixel formats that has an alpha channel
static const sw_pixel_alpha_t SW_PIXELFORMAT_ALPHA[SW_PIXELFORMAT_COUNT] =
{
[SW_PIXELFORMAT_COLOR_GRAYSCALE] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_GRAYALPHA] = SW_PIXEL_ALPHA_YES,
[SW_PIXELFORMAT_COLOR_R3G3B2] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R5G6B5] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R8G8B8] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R5G5B5A1] = SW_PIXEL_ALPHA_BIN,
[SW_PIXELFORMAT_COLOR_R4G4B4A4] = SW_PIXEL_ALPHA_YES,
[SW_PIXELFORMAT_COLOR_R8G8B8A8] = SW_PIXEL_ALPHA_YES,
[SW_PIXELFORMAT_COLOR_R32] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R32G32B32] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R32G32B32A32] = SW_PIXEL_ALPHA_YES,
[SW_PIXELFORMAT_COLOR_R16] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R16G16B16] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_COLOR_R16G16B16A16] = SW_PIXEL_ALPHA_YES,
[SW_PIXELFORMAT_DEPTH_D8] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_DEPTH_D16] = SW_PIXEL_ALPHA_NONE,
[SW_PIXELFORMAT_DEPTH_D32] = SW_PIXEL_ALPHA_NONE,
};
// Pixel formats sizes in bytes
static const int SW_PIXELFORMAT_SIZE[SW_PIXELFORMAT_COUNT] =
{
[SW_PIXELFORMAT_COLOR_GRAYSCALE] = 1,
[SW_PIXELFORMAT_COLOR_GRAYALPHA] = 2,
[SW_PIXELFORMAT_COLOR_R3G3B2] = 1,
[SW_PIXELFORMAT_COLOR_R5G6B5] = 2,
[SW_PIXELFORMAT_COLOR_R8G8B8] = 3,
[SW_PIXELFORMAT_COLOR_R5G5B5A1] = 2,
[SW_PIXELFORMAT_COLOR_R4G4B4A4] = 2,
[SW_PIXELFORMAT_COLOR_R8G8B8A8] = 4,
[SW_PIXELFORMAT_COLOR_R32] = 4,
[SW_PIXELFORMAT_COLOR_R32G32B32] = 12,
[SW_PIXELFORMAT_COLOR_R32G32B32A32] = 16,
[SW_PIXELFORMAT_COLOR_R16] = 2,
[SW_PIXELFORMAT_COLOR_R16G16B16] = 6,
[SW_PIXELFORMAT_COLOR_R16G16B16A16] = 8,
[SW_PIXELFORMAT_DEPTH_D8] = 1,
[SW_PIXELFORMAT_DEPTH_D16] = 2,
[SW_PIXELFORMAT_DEPTH_D32] = 4,
};
static const int SW_PRIMITIVE_VERTEX_COUNT[] =
{
// Remember that this is acceptable; these are small indices
[SW_POINTS] = 1,
[SW_LINES] = 2,
[SW_TRIANGLES] = 3,
[SW_QUADS] = 4,
};
//----------------------------------------------------------------------------------
// Internal Functions Definitions
//----------------------------------------------------------------------------------
// Common helper macros
//----------------------------------------------------------------------------------
#define SW_VEC_OP(expr, i_name, count) do { \
for (int i_name = 0; i_name < (count); i_name++) expr; \
} while (0)
//----------------------------------------------------------------------------------
// Math helper functions
//----------------------------------------------------------------------------------
static SW_INLINE void sw_matrix_id(sw_matrix_t dst)
{
dst[0] = 1, dst[1] = 0, dst[2] = 0, dst[3] = 0;
dst[4] = 0, dst[5] = 1, dst[6] = 0, dst[7] = 0;
dst[8] = 0, dst[9] = 0, dst[10] = 1, dst[11] = 0;
dst[12] = 0, dst[13] = 0, dst[14] = 0, dst[15] = 1;
}
static void sw_matrix_mul_rst(float *SW_RESTRICT dst, const float *SW_RESTRICT left, const float *SW_RESTRICT right)
{
#ifdef SW_HAS_ESP_DSP
// dspm_mult_4x4x4_f32 treats its operands as row-major. rlsw stores matrices
// column-major, so passing them flat is equivalent to passing transposes:
// dspm_mult(L^T, R^T) computes (L^T)*(R^T) = (R*L)^T, written back into a
// flat array gives the same bit pattern as the column-major product (R*L)
// -- exactly the semantic the scalar fallback below has
dspm_mult_4x4x4_f32(left, right, dst);
#else
float l00 = left[0], l01 = left[1], l02 = left[2], l03 = left[3];
float l10 = left[4], l11 = left[5], l12 = left[6], l13 = left[7];
float l20 = left[8], l21 = left[9], l22 = left[10], l23 = left[11];
float l30 = left[12], l31 = left[13], l32 = left[14], l33 = left[15];
dst[0] = l00*right[0] + l01*right[4] + l02*right[8] + l03*right[12];
dst[4] = l10*right[0] + l11*right[4] + l12*right[8] + l13*right[12];
dst[8] = l20*right[0] + l21*right[4] + l22*right[8] + l23*right[12];
dst[12] = l30*right[0] + l31*right[4] + l32*right[8] + l33*right[12];
dst[1] = l00*right[1] + l01*right[5] + l02*right[9] + l03*right[13];
dst[5] = l10*right[1] + l11*right[5] + l12*right[9] + l13*right[13];
dst[9] = l20*right[1] + l21*right[5] + l22*right[9] + l23*right[13];
dst[13] = l30*right[1] + l31*right[5] + l32*right[9] + l33*right[13];
dst[2] = l00*right[2] + l01*right[6] + l02*right[10] + l03*right[14];
dst[6] = l10*right[2] + l11*right[6] + l12*right[10] + l13*right[14];
dst[10] = l20*right[2] + l21*right[6] + l22*right[10] + l23*right[14];
dst[14] = l30*right[2] + l31*right[6] + l32*right[10] + l33*right[14];
dst[3] = l00*right[3] + l01*right[7] + l02*right[11] + l03*right[15];
dst[7] = l10*right[3] + l11*right[7] + l12*right[11] + l13*right[15];
dst[11] = l20*right[3] + l21*right[7] + l22*right[11] + l23*right[15];
dst[15] = l30*right[3] + l31*right[7] + l32*right[11] + l33*right[15];
#endif
}
static SW_INLINE void sw_matrix_mul(sw_matrix_t dst, const sw_matrix_t left, const sw_matrix_t right)
{
float result[16];
sw_matrix_mul_rst(result, left, right);
for (int i = 0; i < 16; i++) dst[i] = result[i];
}
static SW_INLINE int sw_clamp_int(int v, int min, int max)
{
if (v < min) return min;
if (v > max) return max;
return v;
}
static SW_INLINE int sw_clamp(float v, float min, float max)
{
if (v < min) return min;
if (v > max) return max;
return v;
}
static SW_INLINE float sw_saturate(float x)
{
union { float f; uint32_t u; } fb;
fb.f = x;
// Check if x < 0.0f
// If sign bit is set (MSB), x is negative
if ((fb.u & 0x80000000) != 0) return 0.0f;
// Check if x > 1.0f
// Works for positive floats: IEEE 754 ordering matches integer ordering
if (fb.u > 0x3F800000) return 1.0f;
// x is in [0.0f, 1.0f]
return x;
}
static SW_INLINE float sw_fract(float x)
{
return (x - floorf(x));
}
static SW_INLINE float sw_rcp(float x)
{
#if defined(__XTENSA__)
// Xtensa architecture optimization
// Fast reciprocal: 1-ULP accurate in ~7 instructions using the
// hardware `recip0.s` seed + two Newton-Raphson refinement steps
// All work stays in FPU registers — no `__divsf3` software call
// Hot-path divisions in the rasterizer (span/triangle setup, perspective divide, etc.) call this
// On non-Xtensa targets it transparently expands to `1.0f / x`, so generated code is identical to before
float result, temp;
__asm__(
"recip0.s %0, %2\n"
"const.s %1, 1\n"
"msub.s %1, %2, %0\n"
"madd.s %0, %0, %1\n"
"const.s %1, 1\n"
"msub.s %1, %2, %0\n"
"maddn.s %0, %0, %1\n"
: "=&f"(result), "=&f"(temp) : "f"(x)
);
return result;
#else
return 1.0f/x;
#endif
}
static SW_INLINE uint8_t sw_luminance8(const uint8_t *color)
{
return (uint8_t)((color[0]*77 + color[1]*150 + color[2]*29) >> 8);
}
static SW_INLINE float sw_luminance(const float *color)
{
return color[0]*0.299f + color[1]*0.587f + color[2]*0.114f;
}
static void sw_lerp_vertex_PCT(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT a, const sw_vertex_t *SW_RESTRICT b, float t)
{
const float tInv = 1.0f - t;
// Position interpolation (4 components)
out->position[0] = a->position[0]*tInv + b->position[0]*t;
out->position[1] = a->position[1]*tInv + b->position[1]*t;
out->position[2] = a->position[2]*tInv + b->position[2]*t;
out->position[3] = a->position[3]*tInv + b->position[3]*t;
// Color interpolation (4 components)
out->color[0] = a->color[0]*tInv + b->color[0]*t;
out->color[1] = a->color[1]*tInv + b->color[1]*t;
out->color[2] = a->color[2]*tInv + b->color[2]*t;
out->color[3] = a->color[3]*tInv + b->color[3]*t;
// Texture coordinate interpolation (2 components)
out->texcoord[0] = a->texcoord[0]*tInv + b->texcoord[0]*t;
out->texcoord[1] = a->texcoord[1]*tInv + b->texcoord[1]*t;
}
// Half conversion functions
static SW_INLINE uint16_t sw_float_to_half_ui(uint32_t ui)
{
int32_t s = (ui >> 16) & 0x8000;
int32_t em = ui & 0x7fffffff;
// Bias exponent and round to nearest; 112 is relative exponent bias (127-15)
int32_t h = (em - (112 << 23) + (1 << 12)) >> 13;
// Underflow: flush to zero; 113 encodes exponent -14
h = (em < (113 << 23))? 0 : h;
// Overflow: infinity; 143 encodes exponent 16
h = (em >= (143 << 23))? 0x7c00 : h;
// NaN; note that all types of NaN are converted to qNaN
h = (em > (255 << 23))? 0x7e00 : h;
return (uint16_t)(s | h);
}
static SW_INLINE uint32_t sw_half_to_float_ui(uint16_t h)
{
uint32_t s = (unsigned)(h & 0x8000) << 16;
int32_t em = h & 0x7fff;
// Bias exponent and pad mantissa with 0; 112 is relative exponent bias (127-15)
int32_t r = (em + (112 << 10)) << 13;
// Denormal: flush to zero
r = (em < (1 << 10))? 0 : r;
// Infinity/NaN; note that NaN payload is preeserved as a byproduct of unifying inf/nan cases
// 112 is an exponent bias fixup; since it was already applied once, applying it twice converts 31 to 255
r += (em >= (31 << 10))? (112 << 23) : 0;
return s | r;
}
static SW_INLINE sw_half_t sw_float_to_half(float i)
{
union { float f; uint32_t i; } v;
v.f = i;
return sw_float_to_half_ui(v.i);
}
static SW_INLINE float sw_half_to_float(sw_half_t y)
{
union { float f; uint32_t i; } v;
v.i = sw_half_to_float_ui(y);
return v.f;
}
static SW_INLINE uint8_t sw_expand_1to8(uint32_t v) { return v? 255 : 0; }
static SW_INLINE uint8_t sw_expand_2to8(uint32_t v) { return (uint8_t)(v*85); }
static SW_INLINE uint8_t sw_expand_3to8(uint32_t v) { return (uint8_t)((v << 5) | (v << 2) | (v >> 1)); }
static SW_INLINE uint8_t sw_expand_4to8(uint32_t v) { return (uint8_t)((v << 4) | v); }
static SW_INLINE uint8_t sw_expand_5to8(uint32_t v) { return (uint8_t)((v << 3) | (v >> 2)); }
static SW_INLINE uint8_t sw_expand_6to8(uint32_t v) { return (uint8_t)((v << 2) | (v >> 4)); }
static SW_INLINE uint32_t sw_compress_8to1(uint8_t v) { return v >> 7; }
static SW_INLINE uint32_t sw_compress_8to2(uint8_t v) { return v >> 6; }
static SW_INLINE uint32_t sw_compress_8to3(uint8_t v) { return v >> 5; }
static SW_INLINE uint32_t sw_compress_8to4(uint8_t v) { return v >> 4; }
static SW_INLINE uint32_t sw_compress_8to5(uint8_t v) { return v >> 3; }
static SW_INLINE uint32_t sw_compress_8to6(uint8_t v) { return v >> 2; }
static SW_INLINE void sw_color8_to_color(float *SW_RESTRICT dst, const uint8_t *SW_RESTRICT src)
{
#if defined(SW_HAS_NEON)
uint8x8_t bytes = vreinterpret_u8_u32(vld1_dup_u32((const uint32_t *)src));
uint16x8_t words = vmovl_u8(bytes);
uint32x4_t dwords = vmovl_u16(vget_low_u16(words));
float32x4_t fvals = vmulq_f32(vcvtq_f32_u32(dwords), vdupq_n_f32(SW_INV_255));
vst1q_f32(dst, fvals);
#elif defined(SW_HAS_SSE41)
__m128i bytes = _mm_loadu_si32(src);
__m128 fvals = _mm_mul_ps(_mm_cvtepi32_ps(_mm_cvtepu8_epi32(bytes)), _mm_set1_ps(SW_INV_255));
_mm_storeu_ps(dst, fvals);
#elif defined(SW_HAS_SSE2)
__m128i zero = _mm_setzero_si128();
__m128i bytes = _mm_loadu_si32(src);
__m128i words = _mm_unpacklo_epi8(bytes, zero);
__m128i dwords = _mm_unpacklo_epi16(words, zero);
__m128 fvals = _mm_mul_ps(_mm_cvtepi32_ps(dwords), _mm_set1_ps(SW_INV_255));
_mm_storeu_ps(dst, fvals);
#elif defined(SW_HAS_RVV)
// TODO: WARNING: Sample code generated by AI, needs testing and review
size_t vl = __riscv_vsetvl_e8m1(4); // Set vector length for 8-bit input elements
vuint8m1_t vsrc_u8 = __riscv_vle8_v_u8m1(src, vl); // Load 4 unsigned 8-bit integers
vuint32m1_t vsrc_u32 = __riscv_vwcvt_xu_u_v_u32m1(vsrc_u8, vl); // Widen to 32-bit unsigned integers
vfloat32m1_t vsrc_f32 = __riscv_vfcvt_f_xu_v_f32m1(vsrc_u32, vl); // Convert to float32
vfloat32m1_t vnorm = __riscv_vfmul_vf_f32m1(vsrc_f32, SW_INV_255, vl); // Multiply by 1/255.0 to normalize
__riscv_vse32_v_f32m1(dst, vnorm, vl); // Store result
#elif RLSW_USE_COLOR_LUT
dst[0] = SW_LUT_UINT8_TO_FLOAT[src[0]];
dst[1] = SW_LUT_UINT8_TO_FLOAT[src[1]];
dst[2] = SW_LUT_UINT8_TO_FLOAT[src[2]];
dst[3] = SW_LUT_UINT8_TO_FLOAT[src[3]];
#else
dst[0] = (float)src[0]*SW_INV_255;
dst[1] = (float)src[1]*SW_INV_255;
dst[2] = (float)src[2]*SW_INV_255;
dst[3] = (float)src[3]*SW_INV_255;
#endif
}
static SW_INLINE void sw_color_to_color8(uint8_t *SW_RESTRICT dst, const float *SW_RESTRICT src)
{
#if defined(SW_HAS_NEON)
float32x4_t fvals = vmulq_f32(vld1q_f32(src), vdupq_n_f32(255.0f));
uint32x4_t i32 = vcvtq_u32_f32(fvals);
uint16x4_t i16 = vmovn_u32(i32);
uint8x8_t i8 = vmovn_u16(vcombine_u16(i16, i16));
vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(i8), 0);
#elif defined(SW_HAS_SSE41)
__m128 fvals = _mm_mul_ps(_mm_loadu_ps(src), _mm_set1_ps(255.0f));
__m128i i32 = _mm_cvttps_epi32(fvals);
__m128i i16 = _mm_packus_epi32(i32, i32);
__m128i i8 = _mm_packus_epi16(i16, i16);
_mm_storeu_si32(dst, i8);
#elif defined(SW_HAS_SSE2)
__m128 fvals = _mm_mul_ps(_mm_loadu_ps(src), _mm_set1_ps(255.0f));
__m128i i32 = _mm_cvttps_epi32(fvals);
__m128i i16 = _mm_packs_epi32(i32, i32);
__m128i i8 = _mm_packus_epi16(i16, i16);
_mm_storeu_si32(dst, i8);
#elif defined(SW_HAS_RVV)
// TODO: WARNING: Sample code generated by AI, needs testing and review
// REVIEW: It shouldn't perform so many operations; take inspiration from other versions
// NOTE: RVV 1.0 specs define the use of __riscv_ prefix for instrinsic functions
size_t vl = __riscv_vsetvl_e32m1(4); // Load up to 4 floats into a vector register
vfloat32m1_t vsrc = __riscv_vle32_v_f32m1(src, vl); // Load float32 values
// Multiply by 255.0f and add 0.5f for rounding
vfloat32m1_t vscaled = __riscv_vfmul_vf_f32m1(vsrc, 255.0f, vl);
vscaled = __riscv_vfadd_vf_f32m1(vscaled, 0.5f, vl);
// Convert to unsigned integer (truncate toward zero)
vuint32m1_t vu32 = __riscv_vfcvt_xu_f_v_u32m1(vscaled, vl);
// Narrow from u32 -> u8
vuint8m1_t vu8 = __riscv_vnclipu_wx_u8m1(vu32, 0, vl); // Round toward zero
__riscv_vse8_v_u8m1(dst, vu8, vl); // Store result
#else
dst[0] = (uint8_t)(src[0]*255.0f);
dst[1] = (uint8_t)(src[1]*255.0f);
dst[2] = (uint8_t)(src[2]*255.0f);
dst[3] = (uint8_t)(src[3]*255.0f);
#endif
}
//-------------------------------------------------------------------------------------------
// Object pool functions
//-------------------------------------------------------------------------------------------
static bool sw_pool_init(sw_pool_t *pool, int capacity, size_t stride)
{
*pool = (sw_pool_t) { 0 };
pool->data = SW_CALLOC(capacity, stride);
pool->gen = SW_CALLOC(capacity, sizeof(uint8_t));
pool->freeList = SW_MALLOC(capacity*sizeof(uint32_t));
if (!pool->data || !pool->gen || !pool->freeList)
{
SW_FREE(pool->data);
SW_FREE(pool->gen);
SW_FREE(pool->freeList);
return false;
}
pool->watermark = 1;
pool->capacity = capacity;
pool->stride = stride;
return true;
}
static void sw_pool_destroy(sw_pool_t *pool)
{
SW_FREE(pool->data);
SW_FREE(pool->gen);
SW_FREE(pool->freeList);
*pool = (sw_pool_t) { 0 };
}
static sw_handle_t sw_pool_alloc(sw_pool_t *pool)
{
uint32_t index;
if (pool->freeCount > 0)
{
index = pool->freeList[--pool->freeCount];
}
else
{
if (pool->watermark >= pool->capacity) return SW_HANDLE_NULL;
index = (uint32_t)pool->watermark++;
}
uint8_t ver = ((pool->gen[index] & SW_POOL_SLOT_VER_MASK) + 1) & SW_POOL_SLOT_VER_MASK;
if (ver == 0) ver = 1;
pool->gen[index] = SW_POOL_SLOT_LIVE | ver;
uint8_t *slot = (uint8_t *)pool->data + index*pool->stride;
for (size_t i = 0; i < pool->stride; i++) slot[i] = 0;
return (sw_handle_t)index;
}
static void *sw_pool_get(const sw_pool_t *pool, sw_handle_t handle)
{
if (handle == SW_HANDLE_NULL) return NULL;
if ((int)handle >= pool->capacity) return NULL;
if (!(pool->gen[handle] & SW_POOL_SLOT_LIVE)) return NULL;
return (char *)pool->data + handle*pool->stride;
}
static bool sw_pool_valid(const sw_pool_t *pool, sw_handle_t handle)
{
return sw_pool_get(pool, handle) != NULL;
}
static bool sw_pool_free(sw_pool_t *pool, sw_handle_t handle)
{
if (!sw_pool_valid(pool, handle)) return false;
pool->gen[handle] &= SW_POOL_SLOT_VER_MASK; // delete live flag
pool->freeList[pool->freeCount++] = handle;
return true;
}
//-------------------------------------------------------------------------------------------
// Validity check helper functions
//-------------------------------------------------------------------------------------------
static SW_INLINE bool sw_is_texture_valid(sw_handle_t id)
{
return sw_pool_valid(&RLSW.texturePool, id);
}
static SW_INLINE bool sw_is_texture_complete(sw_texture_t *tex)
{
return (tex != NULL) && (tex->pixels != NULL);
}
static SW_INLINE bool sw_is_texture_filter_valid(int filter)
{
return ((filter == SW_NEAREST) || (filter == SW_LINEAR));
}
static SW_INLINE bool sw_is_texture_wrap_valid(int wrap)
{
return ((wrap == SW_REPEAT) || (wrap == SW_CLAMP));
}
static bool sw_is_draw_mode_valid(int mode)
{
bool result = false;
switch (mode)
{
case SW_POINTS:
case SW_LINES:
case SW_TRIANGLES:
case SW_QUADS: result = true; break;
default: break;
}
return result;
}
static bool sw_is_poly_mode_valid(int mode)
{
bool result = false;
switch (mode)
{
case SW_POINT:
case SW_LINE:
case SW_FILL: result = true; break;
default: break;
}
return result;
}
static SW_INLINE bool sw_is_face_valid(int face)
{
return (face == SW_FRONT || face == SW_BACK);
}
static SW_INLINE bool sw_is_ready_to_render(void)
{
return (swCheckFramebufferStatus() == SW_FRAMEBUFFER_COMPLETE);
}
//-------------------------------------------------------------------------------------------
// Pixel management functions
//-------------------------------------------------------------------------------------------
static int sw_pixel_get_format(SWformat format, SWtype type)
{
int channels = 0;
int bitsPerChannel = 8; // Default: 8 bits per channel
// Handle case where format is a depth component
if (format == SW_DEPTH_COMPONENT)
{
switch (type)
{
case SW_UNSIGNED_BYTE: return SW_PIXELFORMAT_DEPTH_D8;
case SW_BYTE: return SW_PIXELFORMAT_DEPTH_D8;
case SW_UNSIGNED_SHORT: return SW_PIXELFORMAT_DEPTH_D16;
case SW_SHORT: return SW_PIXELFORMAT_DEPTH_D16;
case SW_UNSIGNED_INT: return SW_PIXELFORMAT_DEPTH_D32;
case SW_INT: return SW_PIXELFORMAT_DEPTH_D32;
case SW_FLOAT: return SW_PIXELFORMAT_DEPTH_D32;
default: return SW_PIXELFORMAT_UNKNOWN;
}
}
// Handle case where the type is a packed color
switch (type)
{
case SW_UNSIGNED_BYTE_3_3_2: return SW_PIXELFORMAT_COLOR_R3G3B2;
case SW_UNSIGNED_SHORT_5_6_5: return SW_PIXELFORMAT_COLOR_R5G6B5;
case SW_UNSIGNED_SHORT_4_4_4_4: return SW_PIXELFORMAT_COLOR_R4G4B4A4;
case SW_UNSIGNED_SHORT_5_5_5_1: return SW_PIXELFORMAT_COLOR_R5G5B5A1;
default: break;
}
// Determine the number of channels (format)
switch (format)
{
case SW_LUMINANCE: channels = 1; break;
case SW_LUMINANCE_ALPHA: channels = 2; break;
case SW_RGB: channels = 3; break;
case SW_RGBA: channels = 4; break;
default: return SW_PIXELFORMAT_UNKNOWN;
}
// Determine the depth of each channel (type)
switch (type)
{
case SW_UNSIGNED_BYTE: bitsPerChannel = 8; break;
case SW_BYTE: bitsPerChannel = 8; break;
case SW_UNSIGNED_SHORT: bitsPerChannel = 16; break;
case SW_SHORT: bitsPerChannel = 16; break;
case SW_UNSIGNED_INT: bitsPerChannel = 32; break;
case SW_INT: bitsPerChannel = 32; break;
case SW_FLOAT: bitsPerChannel = 32; break;
default: return SW_PIXELFORMAT_UNKNOWN;
}
// Map the format and type to the correct internal format
if (bitsPerChannel == 8)
{
if (channels == 1) return SW_PIXELFORMAT_COLOR_GRAYSCALE;
if (channels == 2) return SW_PIXELFORMAT_COLOR_GRAYALPHA;
if (channels == 3) return SW_PIXELFORMAT_COLOR_R8G8B8;
if (channels == 4) return SW_PIXELFORMAT_COLOR_R8G8B8A8;
}
else if (bitsPerChannel == 16)
{
if (channels == 1) return SW_PIXELFORMAT_COLOR_R16;
if (channels == 3) return SW_PIXELFORMAT_COLOR_R16G16B16;
if (channels == 4) return SW_PIXELFORMAT_COLOR_R16G16B16A16;
}
else if (bitsPerChannel == 32)
{
if (channels == 1) return SW_PIXELFORMAT_COLOR_R32;
if (channels == 3) return SW_PIXELFORMAT_COLOR_R32G32B32;
if (channels == 4) return SW_PIXELFORMAT_COLOR_R32G32B32A32;
}
return SW_PIXELFORMAT_UNKNOWN;
}
static bool sw_pixel_is_depth_format(sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_DEPTH_D8:
case SW_PIXELFORMAT_DEPTH_D16:
case SW_PIXELFORMAT_DEPTH_D32: return true;
default: break;
}
return false;
}
static void sw_pixel_read_color8_GRAYSCALE(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t gray = ((const uint8_t *)pixels)[offset];
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
}
static void sw_pixel_read_color8_GRAYALPHA(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint8_t *src = &((const uint8_t *)pixels)[offset*2];
color[0] = src[0];
color[1] = src[0];
color[2] = src[0];
color[3] = src[1];
}
static void sw_pixel_read_color8_R3G3B2(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t pixel = ((const uint8_t *)pixels)[offset];
color[0] = sw_expand_3to8((pixel >> 5) & 0x07);
color[1] = sw_expand_3to8((pixel >> 2) & 0x07);
color[2] = sw_expand_2to8( pixel & 0x03);
color[3] = 255;
}
static void sw_pixel_read_color8_R5G6B5(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint16_t pixel = ((const uint16_t *)pixels)[offset];
color[0] = sw_expand_5to8((pixel >> 11) & 0x1F);
color[1] = sw_expand_6to8((pixel >> 5) & 0x3F);
color[2] = sw_expand_5to8( pixel & 0x1F);
color[3] = 255;
}
static void sw_pixel_read_color8_R8G8B8(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint8_t *src = &((const uint8_t *)pixels)[offset*3];
color[0] = src[0];
color[1] = src[1];
color[2] = src[2];
color[3] = 255;
}
static void sw_pixel_read_color8_R5G5B5A1(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint16_t pixel = ((const uint16_t *)pixels)[offset];
color[0] = sw_expand_5to8((pixel >> 11) & 0x1F);
color[1] = sw_expand_5to8((pixel >> 6) & 0x1F);
color[2] = sw_expand_5to8((pixel >> 1) & 0x1F);
color[3] = sw_expand_1to8( pixel & 0x01);
}
static void sw_pixel_read_color8_R4G4B4A4(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint16_t pixel = ((const uint16_t *)pixels)[offset];
color[0] = sw_expand_4to8((pixel >> 12) & 0x0F);
color[1] = sw_expand_4to8((pixel >> 8) & 0x0F);
color[2] = sw_expand_4to8((pixel >> 4) & 0x0F);
color[3] = sw_expand_4to8( pixel & 0x0F);
}
static void sw_pixel_read_color8_R8G8B8A8(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint8_t *src = &((const uint8_t *)pixels)[offset*4];
color[0] = src[0];
color[1] = src[1];
color[2] = src[2];
color[3] = src[3];
}
static void sw_pixel_read_color8_R32(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t gray = (uint8_t)(((const float *)pixels)[offset]*255.0f);
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
}
static void sw_pixel_read_color8_R32G32B32(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const float *src = &((const float *)pixels)[offset*3];
color[0] = (uint8_t)(src[0]*255.0f);
color[1] = (uint8_t)(src[1]*255.0f);
color[2] = (uint8_t)(src[2]*255.0f);
color[3] = 255;
}
static void sw_pixel_read_color8_R32G32B32A32(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const float *src = &((const float *)pixels)[offset*4];
color[0] = (uint8_t)(src[0]*255.0f);
color[1] = (uint8_t)(src[1]*255.0f);
color[2] = (uint8_t)(src[2]*255.0f);
color[3] = (uint8_t)(src[3]*255.0f);
}
static void sw_pixel_read_color8_R16(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t gray = (uint8_t)(sw_half_to_float(((const uint16_t *)pixels)[offset])*255.0f);
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
}
static void sw_pixel_read_color8_R16G16B16(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint16_t *src = &((const uint16_t *)pixels)[offset*3];
color[0] = (uint8_t)(sw_half_to_float(src[0])*255.0f);
color[1] = (uint8_t)(sw_half_to_float(src[1])*255.0f);
color[2] = (uint8_t)(sw_half_to_float(src[2])*255.0f);
color[3] = 255;
}
static void sw_pixel_read_color8_R16G16B16A16(uint8_t *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint16_t *src = &((const uint16_t *)pixels)[offset*4];
color[0] = (uint8_t)(sw_half_to_float(src[0])*255.0f);
color[1] = (uint8_t)(sw_half_to_float(src[1])*255.0f);
color[2] = (uint8_t)(sw_half_to_float(src[2])*255.0f);
color[3] = (uint8_t)(sw_half_to_float(src[3])*255.0f);
}
static sw_pixel_read_color8_f sw_pixel_get_read_color8_func(sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_COLOR_GRAYSCALE: return sw_pixel_read_color8_GRAYSCALE;
case SW_PIXELFORMAT_COLOR_GRAYALPHA: return sw_pixel_read_color8_GRAYALPHA;
case SW_PIXELFORMAT_COLOR_R3G3B2: return sw_pixel_read_color8_R3G3B2;
case SW_PIXELFORMAT_COLOR_R5G6B5: return sw_pixel_read_color8_R5G6B5;
case SW_PIXELFORMAT_COLOR_R8G8B8: return sw_pixel_read_color8_R8G8B8;
case SW_PIXELFORMAT_COLOR_R5G5B5A1: return sw_pixel_read_color8_R5G5B5A1;
case SW_PIXELFORMAT_COLOR_R4G4B4A4: return sw_pixel_read_color8_R4G4B4A4;
case SW_PIXELFORMAT_COLOR_R8G8B8A8: return sw_pixel_read_color8_R8G8B8A8;
case SW_PIXELFORMAT_COLOR_R32: return sw_pixel_read_color8_R32;
case SW_PIXELFORMAT_COLOR_R32G32B32: return sw_pixel_read_color8_R32G32B32;
case SW_PIXELFORMAT_COLOR_R32G32B32A32: return sw_pixel_read_color8_R32G32B32A32;
case SW_PIXELFORMAT_COLOR_R16: return sw_pixel_read_color8_R16;
case SW_PIXELFORMAT_COLOR_R16G16B16: return sw_pixel_read_color8_R16G16B16;
case SW_PIXELFORMAT_COLOR_R16G16B16A16: return sw_pixel_read_color8_R16G16B16A16;
case SW_PIXELFORMAT_UNKNOWN:
case SW_PIXELFORMAT_DEPTH_D8:
case SW_PIXELFORMAT_DEPTH_D16:
case SW_PIXELFORMAT_DEPTH_D32:
case SW_PIXELFORMAT_COUNT:
default: break;
}
return NULL;
}
static void sw_pixel_write_color8_GRAYSCALE(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
((uint8_t *)pixels)[offset] = sw_luminance8(color);
}
static void sw_pixel_write_color8_GRAYALPHA(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint8_t *dst = &((uint8_t *)pixels)[offset*2];
dst[0] = sw_luminance8(color);
dst[1] = color[3];
}
static void sw_pixel_write_color8_R3G3B2(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint8_t pixel = (sw_compress_8to3(color[0]) << 5)
| (sw_compress_8to3(color[1]) << 2)
| sw_compress_8to2(color[2]);
((uint8_t *)pixels)[offset] = pixel;
}
static void sw_pixel_write_color8_R5G6B5(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint16_t pixel = (sw_compress_8to5(color[0]) << 11)
| (sw_compress_8to6(color[1]) << 5)
| sw_compress_8to5(color[2]);
((uint16_t *)pixels)[offset] = pixel;
}
static void sw_pixel_write_color8_R8G8B8(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint8_t *dst = &((uint8_t *)pixels)[offset*3];
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
}
static void sw_pixel_write_color8_R5G5B5A1(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint16_t pixel = (sw_compress_8to5(color[0]) << 11)
| (sw_compress_8to5(color[1]) << 6)
| (sw_compress_8to5(color[2]) << 1)
| sw_compress_8to1(color[3]);
((uint16_t *)pixels)[offset] = pixel;
}
static void sw_pixel_write_color8_R4G4B4A4(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint16_t pixel = (sw_compress_8to4(color[0]) << 12)
| (sw_compress_8to4(color[1]) << 8)
| (sw_compress_8to4(color[2]) << 4)
| sw_compress_8to4(color[3]);
((uint16_t *)pixels)[offset] = pixel;
}
static void sw_pixel_write_color8_R8G8B8A8(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint8_t *dst = &((uint8_t *)pixels)[offset*4];
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
dst[3] = color[3];
}
static void sw_pixel_write_color8_R32(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
((float *)pixels)[offset] = sw_luminance8(color)*SW_INV_255;
}
static void sw_pixel_write_color8_R32G32B32(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
float *dst = &((float *)pixels)[offset*3];
dst[0] = color[0]*SW_INV_255;
dst[1] = color[1]*SW_INV_255;
dst[2] = color[2]*SW_INV_255;
}
static void sw_pixel_write_color8_R32G32B32A32(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
float *dst = &((float *)pixels)[offset*4];
dst[0] = color[0]*SW_INV_255;
dst[1] = color[1]*SW_INV_255;
dst[2] = color[2]*SW_INV_255;
dst[3] = color[3]*SW_INV_255;
}
static void sw_pixel_write_color8_R16(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
((uint16_t *)pixels)[offset] = sw_float_to_half(sw_luminance8(color)*SW_INV_255);
}
static void sw_pixel_write_color8_R16G16B16(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint16_t *dst = &((uint16_t *)pixels)[offset*3];
dst[0] = sw_float_to_half(color[0]*SW_INV_255);
dst[1] = sw_float_to_half(color[1]*SW_INV_255);
dst[2] = sw_float_to_half(color[2]*SW_INV_255);
}
static void sw_pixel_write_color8_R16G16B16A16(void *SW_RESTRICT pixels, const uint8_t *SW_RESTRICT color, uint32_t offset)
{
uint16_t *dst = &((uint16_t *)pixels)[offset*4];
dst[0] = sw_float_to_half(color[0]*SW_INV_255);
dst[1] = sw_float_to_half(color[1]*SW_INV_255);
dst[2] = sw_float_to_half(color[2]*SW_INV_255);
dst[3] = sw_float_to_half(color[3]*SW_INV_255);
}
static sw_pixel_write_color8_f sw_pixel_get_write_color8_func(sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_COLOR_GRAYSCALE: return sw_pixel_write_color8_GRAYSCALE;
case SW_PIXELFORMAT_COLOR_GRAYALPHA: return sw_pixel_write_color8_GRAYALPHA;
case SW_PIXELFORMAT_COLOR_R3G3B2: return sw_pixel_write_color8_R3G3B2;
case SW_PIXELFORMAT_COLOR_R5G6B5: return sw_pixel_write_color8_R5G6B5;
case SW_PIXELFORMAT_COLOR_R8G8B8: return sw_pixel_write_color8_R8G8B8;
case SW_PIXELFORMAT_COLOR_R5G5B5A1: return sw_pixel_write_color8_R5G5B5A1;
case SW_PIXELFORMAT_COLOR_R4G4B4A4: return sw_pixel_write_color8_R4G4B4A4;
case SW_PIXELFORMAT_COLOR_R8G8B8A8: return sw_pixel_write_color8_R8G8B8A8;
case SW_PIXELFORMAT_COLOR_R32: return sw_pixel_write_color8_R32;
case SW_PIXELFORMAT_COLOR_R32G32B32: return sw_pixel_write_color8_R32G32B32;
case SW_PIXELFORMAT_COLOR_R32G32B32A32: return sw_pixel_write_color8_R32G32B32A32;
case SW_PIXELFORMAT_COLOR_R16: return sw_pixel_write_color8_R16;
case SW_PIXELFORMAT_COLOR_R16G16B16: return sw_pixel_write_color8_R16G16B16;
case SW_PIXELFORMAT_COLOR_R16G16B16A16: return sw_pixel_write_color8_R16G16B16A16;
case SW_PIXELFORMAT_UNKNOWN:
case SW_PIXELFORMAT_DEPTH_D8:
case SW_PIXELFORMAT_DEPTH_D16:
case SW_PIXELFORMAT_DEPTH_D32:
case SW_PIXELFORMAT_COUNT:
default: break;
}
return NULL;
}
static void sw_pixel_read_color_GRAYSCALE(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
float gray = ((const uint8_t *)pixels)[offset]*SW_INV_255;
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 1.0f;
}
static void sw_pixel_read_color_GRAYALPHA(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint8_t *src = &((const uint8_t *)pixels)[offset*2];
float gray = src[0]*SW_INV_255;
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = src[1]*SW_INV_255;
}
static void sw_pixel_read_color_R3G3B2(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t unpack[4];
sw_pixel_read_color8_R3G3B2(unpack, pixels, offset);
sw_color8_to_color(color, unpack);
}
static void sw_pixel_read_color_R5G6B5(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t unpack[4];
sw_pixel_read_color8_R5G6B5(unpack, pixels, offset);
sw_color8_to_color(color, unpack);
}
static void sw_pixel_read_color_R8G8B8(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t unpack[4];
sw_pixel_read_color8_R8G8B8(unpack, pixels, offset);
sw_color8_to_color(color, unpack);
}
static void sw_pixel_read_color_R5G5B5A1(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t unpack[4];
sw_pixel_read_color8_R5G5B5A1(unpack, pixels, offset);
sw_color8_to_color(color, unpack);
}
static void sw_pixel_read_color_R4G4B4A4(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
uint8_t unpack[4];
sw_pixel_read_color8_R4G4B4A4(unpack, pixels, offset);
sw_color8_to_color(color, unpack);
}
static void sw_pixel_read_color_R8G8B8A8(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
sw_color8_to_color(color, &((const uint8_t *)pixels)[offset*4]);
}
static void sw_pixel_read_color_R32(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
float val = ((const float *)pixels)[offset];
color[0] = val;
color[1] = val;
color[2] = val;
color[3] = 1.0f;
}
static void sw_pixel_read_color_R32G32B32(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const float *src = &((const float *)pixels)[offset*3];
color[0] = src[0];
color[1] = src[1];
color[2] = src[2];
color[3] = 1.0f;
}
static void sw_pixel_read_color_R32G32B32A32(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const float *src = &((const float *)pixels)[offset*4];
color[0] = src[0];
color[1] = src[1];
color[2] = src[2];
color[3] = src[3];
}
static void sw_pixel_read_color_R16(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
float val = sw_half_to_float(((const uint16_t *)pixels)[offset]);
color[0] = val;
color[1] = val;
color[2] = val;
color[3] = 1.0f;
}
static void sw_pixel_read_color_R16G16B16(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint16_t *src = &((const uint16_t *)pixels)[offset*3];
color[0] = sw_half_to_float(src[0]);
color[1] = sw_half_to_float(src[1]);
color[2] = sw_half_to_float(src[2]);
color[3] = 1.0f;
}
static void sw_pixel_read_color_R16G16B16A16(float *SW_RESTRICT color, const void *SW_RESTRICT pixels, uint32_t offset)
{
const uint16_t *src = &((const uint16_t *)pixels)[offset*4];
color[0] = sw_half_to_float(src[0]);
color[1] = sw_half_to_float(src[1]);
color[2] = sw_half_to_float(src[2]);
color[3] = sw_half_to_float(src[3]);
}
static sw_pixel_read_color_f sw_pixel_get_read_color_func(sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_COLOR_GRAYSCALE: return sw_pixel_read_color_GRAYSCALE;
case SW_PIXELFORMAT_COLOR_GRAYALPHA: return sw_pixel_read_color_GRAYALPHA;
case SW_PIXELFORMAT_COLOR_R3G3B2: return sw_pixel_read_color_R3G3B2;
case SW_PIXELFORMAT_COLOR_R5G6B5: return sw_pixel_read_color_R5G6B5;
case SW_PIXELFORMAT_COLOR_R8G8B8: return sw_pixel_read_color_R8G8B8;
case SW_PIXELFORMAT_COLOR_R5G5B5A1: return sw_pixel_read_color_R5G5B5A1;
case SW_PIXELFORMAT_COLOR_R4G4B4A4: return sw_pixel_read_color_R4G4B4A4;
case SW_PIXELFORMAT_COLOR_R8G8B8A8: return sw_pixel_read_color_R8G8B8A8;
case SW_PIXELFORMAT_COLOR_R32: return sw_pixel_read_color_R32;
case SW_PIXELFORMAT_COLOR_R32G32B32: return sw_pixel_read_color_R32G32B32;
case SW_PIXELFORMAT_COLOR_R32G32B32A32: return sw_pixel_read_color_R32G32B32A32;
case SW_PIXELFORMAT_COLOR_R16: return sw_pixel_read_color_R16;
case SW_PIXELFORMAT_COLOR_R16G16B16: return sw_pixel_read_color_R16G16B16;
case SW_PIXELFORMAT_COLOR_R16G16B16A16: return sw_pixel_read_color_R16G16B16A16;
case SW_PIXELFORMAT_UNKNOWN:
case SW_PIXELFORMAT_DEPTH_D8:
case SW_PIXELFORMAT_DEPTH_D16:
case SW_PIXELFORMAT_DEPTH_D32:
case SW_PIXELFORMAT_COUNT:
default: break;
}
return NULL;
}
static void sw_pixel_write_color_GRAYSCALE(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
((uint8_t *)pixels)[offset] = (uint8_t)(sw_luminance(color)*255.0f);
}
static void sw_pixel_write_color_GRAYALPHA(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t *dst = &((uint8_t *)pixels)[offset*2];
dst[0] = (uint8_t)(sw_luminance(color)*255.0f);
dst[1] = (uint8_t)(color[3]*255.0f);
}
static void sw_pixel_write_color_R3G3B2(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t color8[4];
sw_color_to_color8(color8, color);
sw_pixel_write_color8_R3G3B2(pixels, color8, offset);
}
static void sw_pixel_write_color_R5G6B5(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t color8[4];
sw_color_to_color8(color8, color);
sw_pixel_write_color8_R5G6B5(pixels, color8, offset);
}
static void sw_pixel_write_color_R8G8B8(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t color8[4];
sw_color_to_color8(color8, color);
sw_pixel_write_color8_R8G8B8(pixels, color8, offset);
}
static void sw_pixel_write_color_R5G5B5A1(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t color8[4];
sw_color_to_color8(color8, color);
sw_pixel_write_color8_R5G5B5A1(pixels, color8, offset);
}
static void sw_pixel_write_color_R4G4B4A4(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint8_t color8[4];
sw_color_to_color8(color8, color);
sw_pixel_write_color8_R4G4B4A4(pixels, color8, offset);
}
static void sw_pixel_write_color_R8G8B8A8(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
sw_color_to_color8(&((uint8_t *)pixels)[offset*4], color);
}
static void sw_pixel_write_color_R32(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
((float *)pixels)[offset] = sw_luminance(color);
}
static void sw_pixel_write_color_R32G32B32(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
float *dst = &((float *)pixels)[offset*3];
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
}
static void sw_pixel_write_color_R32G32B32A32(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
float *dst = &((float *)pixels)[offset*4];
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
dst[3] = color[3];
}
static void sw_pixel_write_color_R16(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
((uint16_t *)pixels)[offset] = sw_float_to_half(sw_luminance(color));
}
static void sw_pixel_write_color_R16G16B16(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint16_t *dst = &((uint16_t *)pixels)[offset*3];
dst[0] = sw_float_to_half(color[0]);
dst[1] = sw_float_to_half(color[1]);
dst[2] = sw_float_to_half(color[2]);
}
static void sw_pixel_write_color_R16G16B16A16(void *SW_RESTRICT pixels, const float *SW_RESTRICT color, uint32_t offset)
{
uint16_t *dst = &((uint16_t *)pixels)[offset*4];
dst[0] = sw_float_to_half(color[0]);
dst[1] = sw_float_to_half(color[1]);
dst[2] = sw_float_to_half(color[2]);
dst[3] = sw_float_to_half(color[3]);
}
static sw_pixel_write_color_f sw_pixel_get_write_color_func(sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_COLOR_GRAYSCALE: return sw_pixel_write_color_GRAYSCALE;
case SW_PIXELFORMAT_COLOR_GRAYALPHA: return sw_pixel_write_color_GRAYALPHA;
case SW_PIXELFORMAT_COLOR_R3G3B2: return sw_pixel_write_color_R3G3B2;
case SW_PIXELFORMAT_COLOR_R5G6B5: return sw_pixel_write_color_R5G6B5;
case SW_PIXELFORMAT_COLOR_R8G8B8: return sw_pixel_write_color_R8G8B8;
case SW_PIXELFORMAT_COLOR_R5G5B5A1: return sw_pixel_write_color_R5G5B5A1;
case SW_PIXELFORMAT_COLOR_R4G4B4A4: return sw_pixel_write_color_R4G4B4A4;
case SW_PIXELFORMAT_COLOR_R8G8B8A8: return sw_pixel_write_color_R8G8B8A8;
case SW_PIXELFORMAT_COLOR_R32: return sw_pixel_write_color_R32;
case SW_PIXELFORMAT_COLOR_R32G32B32: return sw_pixel_write_color_R32G32B32;
case SW_PIXELFORMAT_COLOR_R32G32B32A32: return sw_pixel_write_color_R32G32B32A32;
case SW_PIXELFORMAT_COLOR_R16: return sw_pixel_write_color_R16;
case SW_PIXELFORMAT_COLOR_R16G16B16: return sw_pixel_write_color_R16G16B16;
case SW_PIXELFORMAT_COLOR_R16G16B16A16: return sw_pixel_write_color_R16G16B16A16;
case SW_PIXELFORMAT_UNKNOWN:
case SW_PIXELFORMAT_DEPTH_D8:
case SW_PIXELFORMAT_DEPTH_D16:
case SW_PIXELFORMAT_DEPTH_D32:
case SW_PIXELFORMAT_COUNT:
default: break;
}
return NULL;
}
static float sw_pixel_read_depth_D8(const void *pixels, uint32_t offset)
{
return (float)((uint8_t *)pixels)[offset]*SW_INV_255;
}
static float sw_pixel_read_depth_D16(const void *pixels, uint32_t offset)
{
return (float)((uint16_t *)pixels)[offset]/UINT16_MAX;
}
static float sw_pixel_read_depth_D32(const void *pixels, uint32_t offset)
{
return ((float *)pixels)[offset];
}
static void sw_pixel_write_depth_D8(void *pixels, float depth, uint32_t offset)
{
((uint8_t *)pixels)[offset] = (uint8_t)(depth*UINT8_MAX);
}
static void sw_pixel_write_depth_D16(void *pixels, float depth, uint32_t offset)
{
((uint16_t *)pixels)[offset] = (uint16_t)(depth*UINT16_MAX);
}
static void sw_pixel_write_depth_D32(void *pixels, float depth, uint32_t offset)
{
((float *)pixels)[offset] = depth;
}
//-------------------------------------------------------------------------------------------
// Texture functionality
//-------------------------------------------------------------------------------------------
static bool sw_texture_alloc(sw_texture_t *texture, const void *data, int w, int h, sw_pixelformat_t format)
{
bool isDepth = sw_pixel_is_depth_format(format);
int bpp = SW_PIXELFORMAT_SIZE[format];
int newSize = w*h*bpp;
if (texture->pixels == NULL)
{
texture->minFilter = SW_NEAREST;
texture->magFilter = SW_NEAREST;
texture->sWrap = SW_CLAMP;
texture->tWrap = SW_CLAMP;
}
if (newSize > texture->allocSz)
{
void *ptr = SW_REALLOC(texture->pixels, newSize);
if (!ptr) { RLSW.errCode = SW_OUT_OF_MEMORY; return false; }
texture->allocSz = newSize;
texture->pixels = ptr;
}
uint8_t *dst = texture->pixels;
const uint8_t *src = data;
sw_pixel_read_color8_f readColor8 = NULL;
sw_pixel_read_color_f readColor = NULL;
if (!isDepth)
{
readColor8 = sw_pixel_get_read_color8_func(format);
readColor = sw_pixel_get_read_color_func(format);
}
sw_pixel_alpha_t pixelAlpha = SW_PIXELFORMAT_ALPHA[format];
bool alphaFound = !data; // No data: assume transparency
if (data && !isDepth)
{
for (int i = 0; i < newSize; i++) dst[i] = src[i];
if (pixelAlpha != SW_PIXEL_ALPHA_NONE)
{
for (int i = 0; i < newSize; i += bpp)
{
uint8_t color[4] = { 0 };
readColor8(color, &src[i], 0);
if (color[3] < 255) { alphaFound = true; break; }
}
}
}
else
{
for (int i = 0; i < newSize; i++) dst[i] = 0;
}
texture->readColor8 = readColor8;
texture->readColor = readColor;
texture->format = format;
texture->alpha = alphaFound? pixelAlpha : SW_PIXEL_ALPHA_NONE;
texture->width = w;
texture->height = h;
texture->wMinus1 = w - 1;
texture->hMinus1 = h - 1;
texture->tx = 1.0f/w;
texture->ty = 1.0f/h;
return true;
}
static void sw_texture_free(sw_texture_t *texture)
{
SW_FREE(texture->pixels);
}
static void sw_texture_sample_nearest(float *SW_RESTRICT color, const sw_texture_t *SW_RESTRICT tex, float u, float v)
{
int x, y;
#if RLSW_SUPPORT_NPOT_TEXTURE
if (tex->sWrap == SW_REPEAT) x = (int)(sw_fract(u)*tex->width);
else x = (int)(sw_saturate(u)*tex->width);
if (tex->tWrap == SW_REPEAT) y = (int)(sw_fract(v)*tex->height);
else y = (int)(sw_saturate(v)*tex->height);
#else
if (tex->sWrap == SW_REPEAT) x = (int)(u*tex->width) & tex->wMinus1;
else x = (int)(sw_saturate(u)*tex->width);
if (tex->tWrap == SW_REPEAT) y = (int)(v*tex->height) & tex->hMinus1;
else y = (int)(sw_saturate(v)*tex->height);
#endif
tex->readColor(color, tex->pixels, y*tex->width + x);
}
static void sw_texture_sample_linear(float *SW_RESTRICT color, const sw_texture_t *SW_RESTRICT tex, float u, float v)
{
float xf = (u*tex->width) - 0.5f;
float yf = (v*tex->height) - 0.5f;
float fx = sw_fract(xf);
float fy = sw_fract(yf);
int x0 = (int)xf;
int y0 = (int)yf;
int x1 = x0 + 1;
int y1 = y0 + 1;
if (tex->sWrap == SW_REPEAT)
{
#if RLSW_SUPPORT_NPOT_TEXTURE
x0 = (x0%tex->width + tex->width)%tex->width;
x1 = (x1%tex->width + tex->width)%tex->width;
#else
x0 = x0 & tex->wMinus1;
x1 = x1 & tex->wMinus1;
#endif
}
else
{
x0 = sw_clamp_int(x0, 0, tex->wMinus1);
x1 = sw_clamp_int(x1, 0, tex->wMinus1);
}
if (tex->tWrap == SW_REPEAT)
{
#if RLSW_SUPPORT_NPOT_TEXTURE
y0 = (y0%tex->height + tex->height)%tex->height;
y1 = (y1%tex->height + tex->height)%tex->height;
#else
y0 = y0 & tex->hMinus1;
y1 = y1 & tex->hMinus1;
#endif
}
else
{
y0 = sw_clamp_int(y0, 0, tex->hMinus1);
y1 = sw_clamp_int(y1, 0, tex->hMinus1);
}
float c00[4], c10[4], c01[4], c11[4];
tex->readColor(c00, tex->pixels, y0*tex->width + x0);
tex->readColor(c10, tex->pixels, y0*tex->width + x1);
tex->readColor(c01, tex->pixels, y1*tex->width + x0);
tex->readColor(c11, tex->pixels, y1*tex->width + x1);
for (int i = 0; i < 4; i++)
{
float t = c00[i] + fx*(c10[i] - c00[i]);
float b = c01[i] + fx*(c11[i] - c01[i]);
color[i] = t + fy*(b - t);
}
}
// Resolves which sample function to use from the texel-to-pixel derivative magnitude
static sw_texture_sampler_f sw_texture_pick_sampler(const sw_texture_t *tex, const float dTdx[2], const float dTdy[2])
{
// NOTE: Commented there is the previous method used
// There was no need to compute the square root because
// using the squared value, the comparison remains (L2 > 1.0f*1.0f)
//float du = sqrtf(dUdx*dUdx + dUdy*dUdy);
//float dv = sqrtf(dVdx*dVdx + dVdy*dVdy);
//float L = (du > dv)? du : dv;
float dU2 = dTdx[0]*dTdx[0] + dTdy[0]*dTdy[0];
float dV2 = dTdx[1]*dTdx[1] + dTdy[1]*dTdy[1];
float L2 = (dU2 > dV2)? dU2 : dV2;
SWfilter filter = (L2 > 1.0f)? tex->minFilter : tex->magFilter;
return (filter == SW_LINEAR)? sw_texture_sample_linear : sw_texture_sample_nearest;
}
//-------------------------------------------------------------------------------------------
// Framebuffer management functions
//-------------------------------------------------------------------------------------------
static bool sw_default_framebuffer_alloc(sw_default_framebuffer_t *fb, int w, int h)
{
if (!sw_texture_alloc(&fb->color, NULL, w, h, SW_FRAMEBUFFER_COLOR_FORMAT))
{
return false;
}
#if RLSW_DOUBLE_BUFFERING
if (!sw_texture_alloc(&fb->backColor, NULL, w, h, SW_FRAMEBUFFER_COLOR_FORMAT))
{
return false;
}
#endif
if (!sw_texture_alloc(&fb->depth, NULL, w, h, SW_FRAMEBUFFER_DEPTH_FORMAT))
{
return false;
}
return true;
}
static void sw_default_framebuffer_free(sw_default_framebuffer_t *fb)
{
sw_texture_free(&fb->color);
sw_texture_free(&fb->depth);
#if RLSW_DOUBLE_BUFFERING
sw_texture_free(&fb->backColor);
#endif
}
static void sw_framebuffer_fill_color(sw_texture_t *colorBuffer, const float color[4])
{
// NOTE: MSVC doesn't support VLA, so the largest possible size is allocated: 16 bytes
//uint8_t pixel[SW_FRAMEBUFFER_COLOR_SIZE] = { 0 };
uint8_t pixel[16] = { 0 };
SW_FRAMEBUFFER_COLOR_SET(pixel, color, 0);
uint8_t *dst = (uint8_t *)colorBuffer->pixels;
if (RLSW.userState & SW_STATE_SCISSOR_TEST)
{
int xMin = sw_clamp_int(RLSW.scMin[0], 0, colorBuffer->width - 1);
int xMax = sw_clamp_int(RLSW.scMax[0], 0, colorBuffer->width - 1);
int yMin = sw_clamp_int(RLSW.scMin[1], 0, colorBuffer->height - 1);
int yMax = sw_clamp_int(RLSW.scMax[1], 0, colorBuffer->height - 1);
int w = xMax - xMin;
for (int y = yMin; y <= yMax; y++)
{
uint8_t *row = dst + (y*colorBuffer->width + xMin)*SW_FRAMEBUFFER_COLOR_SIZE;
for (int x = 0; x <= w; x++, row += SW_FRAMEBUFFER_COLOR_SIZE)
{
for (int b = 0; b < SW_FRAMEBUFFER_COLOR_SIZE; b++) row[b] = pixel[b];
}
}
}
else
{
int size = colorBuffer->width*colorBuffer->height;
for (int i = 0; i < size; i++)
{
for (int b = 0; b < SW_FRAMEBUFFER_COLOR_SIZE; b++)
{
dst[i*SW_FRAMEBUFFER_COLOR_SIZE + b] = pixel[b];
}
}
}
}
static void sw_framebuffer_fill_depth(sw_texture_t *depthBuffer, float depth)
{
// NOTE: MSVC doesn't support VLA, so the largest possible size is allocated: 4 bytes
//uint8_t pixel[SW_FRAMEBUFFER_DEPTH_SIZE] = { 0 };
uint8_t pixel[4] = { 0 };
SW_FRAMEBUFFER_DEPTH_SET(pixel, depth, 0);
uint8_t *dst = (uint8_t *)depthBuffer->pixels;
if (RLSW.userState & SW_STATE_SCISSOR_TEST)
{
int xMin = sw_clamp_int(RLSW.scMin[0], 0, depthBuffer->width - 1);
int xMax = sw_clamp_int(RLSW.scMax[0], 0, depthBuffer->width - 1);
int yMin = sw_clamp_int(RLSW.scMin[1], 0, depthBuffer->height - 1);
int yMax = sw_clamp_int(RLSW.scMax[1], 0, depthBuffer->height - 1);
int w = xMax - xMin;
for (int y = yMin; y <= yMax; y++)
{
uint8_t *row = dst + (y*depthBuffer->width + xMin)*SW_FRAMEBUFFER_DEPTH_SIZE;
for (int x = 0; x <= w; x++, row += SW_FRAMEBUFFER_DEPTH_SIZE)
{
for (int b = 0; b < SW_FRAMEBUFFER_DEPTH_SIZE; b++) row[b] = pixel[b];
}
}
}
else
{
int size = depthBuffer->width*depthBuffer->height;
for (int i = 0; i < size; i++)
{
for (int b = 0; b < SW_FRAMEBUFFER_DEPTH_SIZE; b++)
{
dst[i*SW_FRAMEBUFFER_DEPTH_SIZE + b] = pixel[b];
}
}
}
}
static void sw_framebuffer_output_fast(void *dst, const sw_texture_t *buffer)
{
int width = buffer->width;
int height = buffer->height;
uint8_t *d = (uint8_t *)dst;
#if RLSW_FRAMEBUFFER_OUTPUT_BGRA && (SW_FRAMEBUFFER_COLOR_FORMAT == SW_PIXELFORMAT_COLOR_R8G8B8A8)
for (int y = height - 1; y >= 0; y--)
{
const uint8_t *src = (uint8_t *)(buffer->pixels) + y*width*4;
for (int x = 0; x < width; x++, src += 4, d += 4)
{
d[0] = src[2];
d[1] = src[1];
d[2] = src[0];
d[3] = src[3];
}
}
#elif RLSW_FRAMEBUFFER_OUTPUT_BGRA && (SW_FRAMEBUFFER_COLOR_FORMAT == SW_PIXELFORMAT_COLOR_R8G8B8)
for (int y = height - 1; y >= 0; y--)
{
const uint8_t *src = (uint8_t *)(buffer->pixels) + y*width*3;
for (int x = 0; x < width; x++, src += 3, d += 3)
{
d[0] = src[2];
d[1] = src[1];
d[2] = src[0];
}
}
#else
int rowBytes = width*SW_FRAMEBUFFER_COLOR_SIZE;
for (int y = height - 1; y >= 0; y--)
{
const uint8_t *src = (uint8_t *)(buffer->pixels) + y*rowBytes;
for (int i = 0; i < rowBytes; i++) d[i] = src[i];
d += rowBytes;
}
#endif
}
static void sw_framebuffer_output_copy(void *dst, const sw_texture_t *buffer, int x, int y, int w, int h, sw_pixelformat_t format)
{
int stride = buffer->width;
int dstPixelSize = SW_PIXELFORMAT_SIZE[format];
sw_pixel_write_color8_f setColor8 = sw_pixel_get_write_color8_func(format);
const uint8_t *src = (uint8_t *)(buffer->pixels) + ((y + h - 1)*stride + x)*SW_FRAMEBUFFER_COLOR_SIZE;
uint8_t *d = dst;
for (int iy = 0; iy < h; iy++)
{
const uint8_t *line = src;
uint8_t *dline = d;
for (int ix = 0; ix < w; ix++)
{
uint8_t color[4];
SW_FRAMEBUFFER_COLOR8_GET(color, line, 0);
#if RLSW_FRAMEBUFFER_OUTPUT_BGRA
if (format == SW_PIXELFORMAT_COLOR_R8G8B8A8 || format == SW_PIXELFORMAT_COLOR_R8G8B8)
{
uint8_t tmp = color[0]; color[0] = color[2]; color[2] = tmp;
}
#endif
setColor8(dline, color, 0);
line += SW_FRAMEBUFFER_COLOR_SIZE;
dline += dstPixelSize;
}
src -= stride*SW_FRAMEBUFFER_COLOR_SIZE;
d += w*dstPixelSize;
}
}
static void sw_framebuffer_output_blit(void *dst, const sw_texture_t *buffer,
int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, sw_pixelformat_t format)
{
const uint8_t *srcBase = buffer->pixels;
int fbWidth = buffer->width;
int dstPixelSize = SW_PIXELFORMAT_SIZE[format];
sw_pixel_write_color8_f setColor8 = sw_pixel_get_write_color8_func(format);
uint32_t xScale = ((uint32_t)wSrc << 16)/(uint32_t)wDst;
uint32_t yScale = ((uint32_t)hSrc << 16)/(uint32_t)hDst;
int ySrcLast = ySrc + hSrc - 1;
uint8_t *d = (uint8_t *)dst;
for (int dy = 0; dy < hDst; dy++)
{
int sy = ySrcLast - (int)(dy*yScale >> 16);
const uint8_t *srcLine = srcBase + (sy*fbWidth + xSrc)*SW_FRAMEBUFFER_COLOR_SIZE;
uint8_t *dline = d;
for (int dx = 0; dx < wDst; dx++)
{
int sx = (int)(dx*xScale >> 16);
const uint8_t *pixel = srcLine + sx*SW_FRAMEBUFFER_COLOR_SIZE;
uint8_t color[4];
SW_FRAMEBUFFER_COLOR8_GET(color, pixel, 0);
#if RLSW_FRAMEBUFFER_OUTPUT_BGRA
if (format == SW_PIXELFORMAT_COLOR_R8G8B8A8 || format == SW_PIXELFORMAT_COLOR_R8G8B8)
{
uint8_t tmp = color[0]; color[0] = color[2]; color[2] = tmp;
}
#endif
setColor8(dline, color, 0);
dline += dstPixelSize;
}
d += wDst*dstPixelSize;
}
}
//-------------------------------------------------------------------------------------------
// Color blending functionality
//-------------------------------------------------------------------------------------------
// Blend factor component macros: SW_BF_XXX(src, dst, component_index)
// Each expands to the scalar factor value for one RGBA channel
#define SW_BF_ZERO(s,d,i) 0.0f
#define SW_BF_ONE(s,d,i) 1.0f
#define SW_BF_SRC_COLOR(s,d,i) (s)[i]
#define SW_BF_ONE_MINUS_SRC_COLOR(s,d,i) (1.0f-(s)[i])
#define SW_BF_SRC_ALPHA(s,d,i) (s)[3]
#define SW_BF_ONE_MINUS_SRC_ALPHA(s,d,i) (1.0f-(s)[3])
#define SW_BF_DST_ALPHA(s,d,i) (d)[3]
#define SW_BF_ONE_MINUS_DST_ALPHA(s,d,i) (1.0f-(d)[3])
#define SW_BF_DST_COLOR(s,d,i) (d)[i]
#define SW_BF_ONE_MINUS_DST_COLOR(s,d,i) (1.0f-(d)[i])
#define SW_BF_SRC_ALPHA_SATURATE(s,d,i) (((i)<3)? 1.0f : (((s)[3]<1.0f)?(s)[3]:1.0f))
// Generates one specialized blend function for a (sfactor, dfactor) pair
#define DEFINE_BLEND_FUNC(sn, dn, SF, DF) \
static void sw_blend_##sn##_##dn(float *SW_RESTRICT dst, const float *SW_RESTRICT src) \
{ \
dst[0] = SF(src,dst,0)*src[0] + DF(src,dst,0)*dst[0]; \
dst[1] = SF(src,dst,1)*src[1] + DF(src,dst,1)*dst[1]; \
dst[2] = SF(src,dst,2)*src[2] + DF(src,dst,2)*dst[2]; \
dst[3] = SF(src,dst,3)*src[3] + DF(src,dst,3)*dst[3]; \
}
// Master factor list: X(c_name, gl_enum, compact_index, SW_BF_macro)
// compact_index is used to index SW_BLEND_TABLE (GL enums are non contiguous)
#define FOREACH_FACTOR(X) \
X(ZERO, SW_ZERO, 0, SW_BF_ZERO ) \
X(ONE, SW_ONE, 1, SW_BF_ONE ) \
X(SRC_COLOR, SW_SRC_COLOR, 2, SW_BF_SRC_COLOR ) \
X(ONE_MINUS_SRC_COLOR, SW_ONE_MINUS_SRC_COLOR, 3, SW_BF_ONE_MINUS_SRC_COLOR) \
X(SRC_ALPHA, SW_SRC_ALPHA, 4, SW_BF_SRC_ALPHA ) \
X(ONE_MINUS_SRC_ALPHA, SW_ONE_MINUS_SRC_ALPHA, 5, SW_BF_ONE_MINUS_SRC_ALPHA) \
X(DST_ALPHA, SW_DST_ALPHA, 6, SW_BF_DST_ALPHA ) \
X(ONE_MINUS_DST_ALPHA, SW_ONE_MINUS_DST_ALPHA, 7, SW_BF_ONE_MINUS_DST_ALPHA) \
X(DST_COLOR, SW_DST_COLOR, 8, SW_BF_DST_COLOR ) \
X(ONE_MINUS_DST_COLOR, SW_ONE_MINUS_DST_COLOR, 9, SW_BF_ONE_MINUS_DST_COLOR) \
X(SRC_ALPHA_SATURATE, SW_SRC_ALPHA_SATURATE, 10, SW_BF_SRC_ALPHA_SATURATE )
// Same list but forwards 3 extra args (A, B, C) to X
#define FOREACH_FACTOR_WITH(X, A, B, C) \
X(ZERO, SW_ZERO, 0, SW_BF_ZERO, A,B,C) \
X(ONE, SW_ONE, 1, SW_BF_ONE, A,B,C) \
X(SRC_COLOR, SW_SRC_COLOR, 2, SW_BF_SRC_COLOR, A,B,C) \
X(ONE_MINUS_SRC_COLOR, SW_ONE_MINUS_SRC_COLOR, 3, SW_BF_ONE_MINUS_SRC_COLOR,A,B,C) \
X(SRC_ALPHA, SW_SRC_ALPHA, 4, SW_BF_SRC_ALPHA, A,B,C) \
X(ONE_MINUS_SRC_ALPHA, SW_ONE_MINUS_SRC_ALPHA, 5, SW_BF_ONE_MINUS_SRC_ALPHA,A,B,C) \
X(DST_ALPHA, SW_DST_ALPHA, 6, SW_BF_DST_ALPHA, A,B,C) \
X(ONE_MINUS_DST_ALPHA, SW_ONE_MINUS_DST_ALPHA, 7, SW_BF_ONE_MINUS_DST_ALPHA,A,B,C) \
X(DST_COLOR, SW_DST_COLOR, 8, SW_BF_DST_COLOR, A,B,C) \
X(ONE_MINUS_DST_COLOR, SW_ONE_MINUS_DST_COLOR, 9, SW_BF_ONE_MINUS_DST_COLOR,A,B,C) \
X(SRC_ALPHA_SATURATE, SW_SRC_ALPHA_SATURATE, 10, SW_BF_SRC_ALPHA_SATURATE, A,B,C)
// Inner loop: receives dst factor + forwarded (sn, si, sf) from outer loop
#define GEN_COMBO(dn, de, di, df, sn, si, sf) DEFINE_BLEND_FUNC(sn, dn, sf, df)
// Outer loop: for each src factor, iterate all dst factors
#define GEN_ROW(sn, se, si, sf) FOREACH_FACTOR_WITH(GEN_COMBO, sn, si, sf)
// Generates all 121 sw_blend_SFACTOR_DFACTOR functions
FOREACH_FACTOR(GEN_ROW)
#undef GEN_COMBO
#undef GEN_ROW
// Inner loop: emits one table entry using compact indices (not GL enum values)
#define GEN_TABLE_ENTRY(dn, de, di, df, sn, si, sf) [si][di] = sw_blend_##sn##_##dn,
// Outer loop: fills one row of the table for a given src factor
#define GEN_TABLE_ROW(sn, se, si, sf) FOREACH_FACTOR_WITH(GEN_TABLE_ENTRY, sn, si, sf)
// 2D dispatch table indexed by compact src/dst factor indices
#define SW_BLEND_FACTOR_COUNT 11
static const sw_blend_f SW_BLEND_TABLE[SW_BLEND_FACTOR_COUNT][SW_BLEND_FACTOR_COUNT] = {
FOREACH_FACTOR(GEN_TABLE_ROW)
};
#undef GEN_TABLE_ENTRY
#undef GEN_TABLE_ROW
// Maps a GL blend factor enum to its compact table index
static int sw_blend_factor_index(SWfactor f)
{
switch (f)
{
case SW_ZERO: return 0;
case SW_ONE: return 1;
case SW_SRC_COLOR: return 2;
case SW_ONE_MINUS_SRC_COLOR: return 3;
case SW_SRC_ALPHA: return 4;
case SW_ONE_MINUS_SRC_ALPHA: return 5;
case SW_DST_ALPHA: return 6;
case SW_ONE_MINUS_DST_ALPHA: return 7;
case SW_DST_COLOR: return 8;
case SW_ONE_MINUS_DST_COLOR: return 9;
case SW_SRC_ALPHA_SATURATE: return 10;
default: return -1;
}
}
static bool sw_blend_factor_needs_alpha(SWfactor f)
{
switch (f)
{
case SW_SRC_ALPHA:
case SW_ONE_MINUS_SRC_ALPHA:
case SW_DST_ALPHA:
case SW_ONE_MINUS_DST_ALPHA:
case SW_SRC_ALPHA_SATURATE: return true;
default: break;
}
return false;
}
static uint32_t sw_blend_compute_flags(SWfactor src, SWfactor dst)
{
uint32_t flags = 0;
// Blend is a no-op: result = src*1 + dst*0 = src
if (src == SW_ONE && dst == SW_ZERO) flags |= SW_BLEND_FLAG_NOOP;
// Factors that depend on the alpha channel
if (sw_blend_factor_needs_alpha(src) || sw_blend_factor_needs_alpha(dst)) flags |= SW_BLEND_FLAG_NEEDS_ALPHA;
return flags;
}
//-------------------------------------------------------------------------------------------
// Projection helper functions
//-------------------------------------------------------------------------------------------
static void sw_project_ndc_to_screen(float ndc[4])
{
ndc[0] = RLSW.vpCenter[0] + ndc[0]*RLSW.vpHalf[0] + 0.5f;
ndc[1] = RLSW.vpCenter[1] + ndc[1]*RLSW.vpHalf[1] + 0.5f;
}
//-------------------------------------------------------------------------------------------
// Polygon clipping management
//-------------------------------------------------------------------------------------------
#define DEFINE_CLIP_FUNC(name, FUNC_IS_INSIDE, FUNC_COMPUTE_T) \
static int sw_clip_##name( \
sw_vertex_t output[SW_MAX_CLIPPED_POLYGON_VERTICES], \
const sw_vertex_t input[SW_MAX_CLIPPED_POLYGON_VERTICES], \
int n) \
{ \
const sw_vertex_t *prev = &input[n - 1]; \
int prevInside = FUNC_IS_INSIDE(prev->position); \
int outputCount = 0; \
\
for (int i = 0; i < n; i++) { \
const sw_vertex_t *curr = &input[i]; \
int currInside = FUNC_IS_INSIDE(curr->position); \
\
/* If transition between interior/exterior, calculate intersection point */ \
if (prevInside != currInside) { \
float t = FUNC_COMPUTE_T(prev->position, curr->position); \
sw_lerp_vertex_PCT(&output[outputCount++], prev, curr, t); \
} \
\
/* If current vertex inside, add it */ \
if (currInside) { \
output[outputCount++] = *curr; \
} \
\
prev = curr; \
prevInside = currInside; \
} \
\
return outputCount; \
}
//-------------------------------------------------------------------------------------------
// Frustum cliping functions
//-------------------------------------------------------------------------------------------
#define IS_INSIDE_PLANE_W(h) ((h)[3] >= SW_CLIP_EPSILON)
#define IS_INSIDE_PLANE_X_POS(h) ( (h)[0] < (h)[3]) // Exclusive for +X
#define IS_INSIDE_PLANE_X_NEG(h) (-(h)[0] < (h)[3]) // Exclusive for -X
#define IS_INSIDE_PLANE_Y_POS(h) ( (h)[1] < (h)[3]) // Exclusive for +Y
#define IS_INSIDE_PLANE_Y_NEG(h) (-(h)[1] < (h)[3]) // Exclusive for -Y
#define IS_INSIDE_PLANE_Z_POS(h) ( (h)[2] <= (h)[3]) // Inclusive for +Z
#define IS_INSIDE_PLANE_Z_NEG(h) (-(h)[2] <= (h)[3]) // Inclusive for -Z
#define COMPUTE_T_PLANE_W(hPrev, hCurr) ((SW_CLIP_EPSILON - (hPrev)[3])/((hCurr)[3] - (hPrev)[3]))
#define COMPUTE_T_PLANE_X_POS(hPrev, hCurr) (((hPrev)[3] - (hPrev)[0])/(((hPrev)[3] - (hPrev)[0]) - ((hCurr)[3] - (hCurr)[0])))
#define COMPUTE_T_PLANE_X_NEG(hPrev, hCurr) (((hPrev)[3] + (hPrev)[0])/(((hPrev)[3] + (hPrev)[0]) - ((hCurr)[3] + (hCurr)[0])))
#define COMPUTE_T_PLANE_Y_POS(hPrev, hCurr) (((hPrev)[3] - (hPrev)[1])/(((hPrev)[3] - (hPrev)[1]) - ((hCurr)[3] - (hCurr)[1])))
#define COMPUTE_T_PLANE_Y_NEG(hPrev, hCurr) (((hPrev)[3] + (hPrev)[1])/(((hPrev)[3] + (hPrev)[1]) - ((hCurr)[3] + (hCurr)[1])))
#define COMPUTE_T_PLANE_Z_POS(hPrev, hCurr) (((hPrev)[3] - (hPrev)[2])/(((hPrev)[3] - (hPrev)[2]) - ((hCurr)[3] - (hCurr)[2])))
#define COMPUTE_T_PLANE_Z_NEG(hPrev, hCurr) (((hPrev)[3] + (hPrev)[2])/(((hPrev)[3] + (hPrev)[2]) - ((hCurr)[3] + (hCurr)[2])))
DEFINE_CLIP_FUNC(w, IS_INSIDE_PLANE_W, COMPUTE_T_PLANE_W)
DEFINE_CLIP_FUNC(x_pos, IS_INSIDE_PLANE_X_POS, COMPUTE_T_PLANE_X_POS)
DEFINE_CLIP_FUNC(x_neg, IS_INSIDE_PLANE_X_NEG, COMPUTE_T_PLANE_X_NEG)
DEFINE_CLIP_FUNC(y_pos, IS_INSIDE_PLANE_Y_POS, COMPUTE_T_PLANE_Y_POS)
DEFINE_CLIP_FUNC(y_neg, IS_INSIDE_PLANE_Y_NEG, COMPUTE_T_PLANE_Y_NEG)
DEFINE_CLIP_FUNC(z_pos, IS_INSIDE_PLANE_Z_POS, COMPUTE_T_PLANE_Z_POS)
DEFINE_CLIP_FUNC(z_neg, IS_INSIDE_PLANE_Z_NEG, COMPUTE_T_PLANE_Z_NEG)
//-------------------------------------------------------------------------------------------
// Scissor clip functions
//-------------------------------------------------------------------------------------------
#define COMPUTE_T_SCISSOR_X_MIN(hPrev, hCurr) (((RLSW.scClipMin[0])*(hPrev)[3] - (hPrev)[0])/(((hCurr)[0] - (RLSW.scClipMin[0])*(hCurr)[3]) - ((hPrev)[0] - (RLSW.scClipMin[0])*(hPrev)[3])))
#define COMPUTE_T_SCISSOR_X_MAX(hPrev, hCurr) (((RLSW.scClipMax[0])*(hPrev)[3] - (hPrev)[0])/(((hCurr)[0] - (RLSW.scClipMax[0])*(hCurr)[3]) - ((hPrev)[0] - (RLSW.scClipMax[0])*(hPrev)[3])))
#define COMPUTE_T_SCISSOR_Y_MIN(hPrev, hCurr) (((RLSW.scClipMin[1])*(hPrev)[3] - (hPrev)[1])/(((hCurr)[1] - (RLSW.scClipMin[1])*(hCurr)[3]) - ((hPrev)[1] - (RLSW.scClipMin[1])*(hPrev)[3])))
#define COMPUTE_T_SCISSOR_Y_MAX(hPrev, hCurr) (((RLSW.scClipMax[1])*(hPrev)[3] - (hPrev)[1])/(((hCurr)[1] - (RLSW.scClipMax[1])*(hCurr)[3]) - ((hPrev)[1] - (RLSW.scClipMax[1])*(hPrev)[3])))
#define IS_INSIDE_SCISSOR_X_MIN(h) ((h)[0] >= (RLSW.scClipMin[0])*(h)[3])
#define IS_INSIDE_SCISSOR_X_MAX(h) ((h)[0] <= (RLSW.scClipMax[0])*(h)[3])
#define IS_INSIDE_SCISSOR_Y_MIN(h) ((h)[1] >= (RLSW.scClipMin[1])*(h)[3])
#define IS_INSIDE_SCISSOR_Y_MAX(h) ((h)[1] <= (RLSW.scClipMax[1])*(h)[3])
DEFINE_CLIP_FUNC(scissor_x_min, IS_INSIDE_SCISSOR_X_MIN, COMPUTE_T_SCISSOR_X_MIN)
DEFINE_CLIP_FUNC(scissor_x_max, IS_INSIDE_SCISSOR_X_MAX, COMPUTE_T_SCISSOR_X_MAX)
DEFINE_CLIP_FUNC(scissor_y_min, IS_INSIDE_SCISSOR_Y_MIN, COMPUTE_T_SCISSOR_Y_MIN)
DEFINE_CLIP_FUNC(scissor_y_max, IS_INSIDE_SCISSOR_Y_MAX, COMPUTE_T_SCISSOR_Y_MAX)
//-------------------------------------------------------------------------------------------
// Main polygon clip function
static bool sw_polygon_clip(sw_vertex_t polygon[SW_MAX_CLIPPED_POLYGON_VERTICES], int *vertexCounter)
{
static sw_vertex_t tmp[SW_MAX_CLIPPED_POLYGON_VERTICES];
int n = *vertexCounter;
#define CLIP_AGAINST_PLANE(FUNC_CLIP) \
{ \
n = FUNC_CLIP(tmp, polygon, n); \
if (n < 3) \
{ \
*vertexCounter = 0; \
return false; \
} \
for (int i = 0; i < n; i++) polygon[i] = tmp[i]; \
}
CLIP_AGAINST_PLANE(sw_clip_w);
CLIP_AGAINST_PLANE(sw_clip_x_pos);
CLIP_AGAINST_PLANE(sw_clip_x_neg);
CLIP_AGAINST_PLANE(sw_clip_y_pos);
CLIP_AGAINST_PLANE(sw_clip_y_neg);
CLIP_AGAINST_PLANE(sw_clip_z_pos);
CLIP_AGAINST_PLANE(sw_clip_z_neg);
if (RLSW.userState & SW_STATE_SCISSOR_TEST)
{
CLIP_AGAINST_PLANE(sw_clip_scissor_x_min);
CLIP_AGAINST_PLANE(sw_clip_scissor_x_max);
CLIP_AGAINST_PLANE(sw_clip_scissor_y_min);
CLIP_AGAINST_PLANE(sw_clip_scissor_y_max);
}
*vertexCounter = n;
return (n >= 3);
}
// Rasterizer variant generation macros
//-------------------------------------------------------------------------------------------
// Argument count (1-4)
#define SW_NARGS_(_1,_2,_3,_4,N,...) N
#define SW_NARGS(...) SW_NARGS_(__VA_ARGS__,4,3,2,1)
// State tokens -> OR'd SW_STATE_xxx flags
#define SW_OR1(a) (SW_STATE_##a)
#define SW_OR2(a,b) (SW_STATE_##a | SW_STATE_##b)
#define SW_OR3(a,b,c) (SW_STATE_##a | SW_STATE_##b | SW_STATE_##c)
#define SW_OR4(a,b,c,d) (SW_STATE_##a | SW_STATE_##b | SW_STATE_##c | SW_STATE_##d)
#define SW_FLAGS_(N, ...) SW_CONCATX(SW_OR, N)(__VA_ARGS__)
#define SW_FLAGS(...) SW_FLAGS_(SW_NARGS(__VA_ARGS__), __VA_ARGS__)
// State tokens -> function name suffix
#define SW_CAT1(a) a
#define SW_CAT2(a,b) a##_##b
#define SW_CAT3(a,b,c) a##_##b##_##c
#define SW_CAT4(a,b,c,d) a##_##b##_##c##_##d
#define SW_NAME_(N, ...) SW_CONCATX(SW_CAT, N)(__VA_ARGS__)
#define SW_NAME(...) SW_NAME_(SW_NARGS(__VA_ARGS__), __VA_ARGS__)
// Forward decl for one variant; SIG is a parenthesized param list
#define SW_RASTER_FWD(PREFIX, SIG, ...) \
static void SW_CONCATX(PREFIX, SW_NAME(__VA_ARGS__)) SIG;
// Dispatch table entry for one variant
#define SW_RASTER_ENTRY(PREFIX, ...) \
[SW_FLAGS(__VA_ARGS__)] = SW_CONCATX(PREFIX, SW_NAME(__VA_ARGS__)),
// Variant lists: X(STATES...) invoked once per specialization
// Triangle/quad: COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND
#define SW_RASTER_VARIANTS_4(X, ...) \
X(__VA_ARGS__, NONE) \
X(__VA_ARGS__, COLOR_INTERP) \
X(__VA_ARGS__, TEXTURE_2D) \
X(__VA_ARGS__, DEPTH_TEST) \
X(__VA_ARGS__, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, TEXTURE_2D) \
X(__VA_ARGS__, COLOR_INTERP, DEPTH_TEST) \
X(__VA_ARGS__, COLOR_INTERP, BLEND) \
X(__VA_ARGS__, TEXTURE_2D, DEPTH_TEST) \
X(__VA_ARGS__, TEXTURE_2D, BLEND) \
X(__VA_ARGS__, DEPTH_TEST, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, TEXTURE_2D, DEPTH_TEST) \
X(__VA_ARGS__, COLOR_INTERP, TEXTURE_2D, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, DEPTH_TEST, BLEND) \
X(__VA_ARGS__, TEXTURE_2D, DEPTH_TEST, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND)
// Variant lists: X(STATES...) invoked once per specialization
// Line: COLOR_INTERP, DEPTH_TEST, BLEND
#define SW_RASTER_VARIANTS_3(X, ...) \
X(__VA_ARGS__, NONE) \
X(__VA_ARGS__, COLOR_INTERP) \
X(__VA_ARGS__, DEPTH_TEST) \
X(__VA_ARGS__, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, DEPTH_TEST) \
X(__VA_ARGS__, COLOR_INTERP, BLEND) \
X(__VA_ARGS__, DEPTH_TEST, BLEND) \
X(__VA_ARGS__, COLOR_INTERP, DEPTH_TEST, BLEND)
// Point: DEPTH_TEST, BLEND
#define SW_RASTER_VARIANTS_2(X, ...) \
X(__VA_ARGS__, NONE) \
X(__VA_ARGS__, DEPTH_TEST) \
X(__VA_ARGS__, BLEND) \
X(__VA_ARGS__, DEPTH_TEST, BLEND)
//-------------------------------------------------------------------------------------------
// Triangle rasterizer variant dispatch
//-------------------------------------------------------------------------------------------
#define SW_RASTER_TRIANGLE_STATE_MASK SW_FLAGS(COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND)
#define SW_RASTER_TRIANGLE_STATES NONE
#include __FILE__ // IWYU pragma: keep
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES TEXTURE_2D
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES DEPTH_TEST
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, TEXTURE_2D
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES TEXTURE_2D, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES TEXTURE_2D, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, TEXTURE_2D, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, TEXTURE_2D, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES TEXTURE_2D, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_STATES COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_TRIANGLE_STATES
// Forward declarations for static analyzer like clangd that do not handle self-inclusion correctly
SW_RASTER_VARIANTS_4(SW_RASTER_FWD, sw_raster_triangle_, (const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*)) // NOLINT
static const sw_raster_triangle_f SW_RASTER_TRIANGLE_TABLE[] = {
SW_RASTER_VARIANTS_4(SW_RASTER_ENTRY, sw_raster_triangle_)
};
//-------------------------------------------------------------------------------------------
// Quad rasterizer variant dispatch
//-------------------------------------------------------------------------------------------
#define SW_RASTER_QUAD_STATE_MASK SW_FLAGS(COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND)
#define SW_RASTER_QUAD_STATES NONE
#include __FILE__ // IWYU pragma: keep
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES TEXTURE_2D
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES DEPTH_TEST
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, TEXTURE_2D
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES TEXTURE_2D, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES TEXTURE_2D, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, TEXTURE_2D, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, TEXTURE_2D, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES TEXTURE_2D, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_STATES COLOR_INTERP, TEXTURE_2D, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_QUAD_STATES
// Forward declarations for static analyzer like clangd that do not handle self-inclusion correctly
SW_RASTER_VARIANTS_4(SW_RASTER_FWD, sw_raster_quad_, (const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*, const sw_vertex_t*)) // NOLINT
static const sw_raster_quad_f SW_RASTER_QUAD_TABLE[] = {
SW_RASTER_VARIANTS_4(SW_RASTER_ENTRY, sw_raster_quad_)
};
//-------------------------------------------------------------------------------------------
// Line rasterizer variant dispatch
//-------------------------------------------------------------------------------------------
#define SW_RASTER_LINE_STATE_MASK SW_FLAGS(COLOR_INTERP, DEPTH_TEST, BLEND)
#define SW_RASTER_LINE_STATES NONE
#include __FILE__ // IWYU pragma: keep
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES COLOR_INTERP
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES DEPTH_TEST
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES BLEND
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES COLOR_INTERP, DEPTH_TEST
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES COLOR_INTERP, BLEND
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_STATES COLOR_INTERP, DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_LINE_STATES
// Forward declarations for static analyzer like clangd that do not handle self-inclusion correctly
SW_RASTER_VARIANTS_3(SW_RASTER_FWD, sw_raster_line_, (const sw_vertex_t*, const sw_vertex_t*)) // NOLINT
static const sw_raster_line_f SW_RASTER_LINE_TABLE[] = {
SW_RASTER_VARIANTS_3(SW_RASTER_ENTRY, sw_raster_line_)
};
//-------------------------------------------------------------------------------------------
// Point rasterizer variant dispatch
//-------------------------------------------------------------------------------------------
#define SW_RASTER_POINT_STATE_MASK SW_FLAGS(DEPTH_TEST, BLEND)
#define SW_RASTER_POINT_STATES NONE
#include __FILE__ // IWYU pragma: keep
#undef SW_RASTER_POINT_STATES
#define SW_RASTER_POINT_STATES DEPTH_TEST
#include __FILE__
#undef SW_RASTER_POINT_STATES
#define SW_RASTER_POINT_STATES BLEND
#include __FILE__
#undef SW_RASTER_POINT_STATES
#define SW_RASTER_POINT_STATES DEPTH_TEST, BLEND
#include __FILE__
#undef SW_RASTER_POINT_STATES
// Forward declarations for static analyzer like clangd that do not handle self-inclusion correctly
SW_RASTER_VARIANTS_2(SW_RASTER_FWD, sw_raster_point_, (const sw_vertex_t*)) // NOLINT
static const sw_raster_point_f SW_RASTER_POINT_TABLE[] = {
SW_RASTER_VARIANTS_2(SW_RASTER_ENTRY, sw_raster_point_)
};
//-------------------------------------------------------------------------------------------
// Triangle rendering logic
//-------------------------------------------------------------------------------------------
static bool sw_triangle_face_culling(void)
{
// NOTE: Face culling is done before clipping to avoid unnecessary computations
// To handle triangles crossing the w=0 plane correctly,
// the winding order test is performeed in clip space directly,
// before the perspective division (division by w)
// This test determines the orientation of the triangle in the (x,y,w) plane,
// which corresponds to the projected 2D winding order sign,
// even with negative w values
// Preload clip coordinates into local variables
const float *p0 = RLSW.primitive.buffer[0].position;
const float *p1 = RLSW.primitive.buffer[1].position;
const float *p2 = RLSW.primitive.buffer[2].position;
// Compute a value proportional to the signed area in the projected 2D plane,
// calculated directly using clip coordinates BEFORE division by w
// This is the determinant of the matrix formed by the (x, y, w) components
// of the vertices, which correctly captures the winding order in clip
// space and its relationship to the projected 2D winding order, even with
// negative w values
// The determinant formula used here is:
// p0.x*(p1.y*p2.w - p2.y*p1.w) +
// p1.x*(p2.y*p0.w - p0.y*p2.w) +
// p2.x*(p0.y*p1.w - p1.y*p0.w)
const float sgnArea =
p0[0]*(p1[1]*p2[3] - p2[1]*p1[3]) +
p1[0]*(p2[1]*p0[3] - p0[1]*p2[3]) +
p2[0]*(p0[1]*p1[3] - p1[1]*p0[3]);
// Discard the triangle if its winding order (determined by the sign
// of the homogeneous area/determinant) matches the culled direction
// A positive sgnArea typically corresponds to a counter-clockwise
// winding in the projected space when all w > 0
// This test is robust for points with w > 0 or w < 0, correctly
// capturing the change in orientation when crossing the w=0 plane
// The culling logic remains the same based on the signed area/determinant
// A value of 0 for sgnArea means the points are collinear in (x, y, w)
// space, which corresponds to a degenerate triangle projection
// Such triangles are typically not culled by this test (0 < 0 is false, 0 > 0 is false)
// and should be handled by the clipper if necessary
return (RLSW.cullFace == SW_FRONT)? (sgnArea < 0) : (sgnArea > 0); // Cull if winding is "clockwise" : "counter-clockwise"
}
static void sw_triangle_clip_and_project(void)
{
sw_vertex_t *polygon = RLSW.primitive.buffer;
int *vertexCounter = &RLSW.primitive.vertexCount;
if (sw_polygon_clip(polygon, vertexCounter))
{
// Transformation to screen space and normalization
for (int i = 0; i < *vertexCounter; i++)
{
sw_vertex_t *v = &polygon[i];
// Calculation of the reciprocal of W for normalization
// as well as perspective-correct attributes
const float wRcp = sw_rcp(v->position[3]);
// Division of XYZ coordinates by weight
v->position[0] *= wRcp;
v->position[1] *= wRcp;
v->position[2] *= wRcp;
v->position[3] = wRcp;
// Division of texture coordinates (perspective-correct)
v->texcoord[0] *= wRcp;
v->texcoord[1] *= wRcp;
// Division of colors (perspective-correct)
v->color[0] *= wRcp;
v->color[1] *= wRcp;
v->color[2] *= wRcp;
v->color[3] *= wRcp;
// Transformation to screen space
sw_project_ndc_to_screen(v->position);
}
}
}
static void sw_triangle_render(uint32_t state)
{
if (RLSW.userState & SW_STATE_CULL_FACE)
{
if (!sw_triangle_face_culling()) return;
}
sw_triangle_clip_and_project();
if (RLSW.primitive.vertexCount < 3) return;
state &= SW_RASTER_TRIANGLE_STATE_MASK;
for (int i = 0; i < RLSW.primitive.vertexCount - 2; i++)
{
SW_RASTER_TRIANGLE_TABLE[state](
&RLSW.primitive.buffer[0],
&RLSW.primitive.buffer[i + 1],
&RLSW.primitive.buffer[i + 2]
);
}
}
//-------------------------------------------------------------------------------------------
// Quad rendering logic
//-------------------------------------------------------------------------------------------
static bool sw_quad_face_culling(void)
{
// NOTE: Face culling is done before clipping to avoid unnecessary computations
// To handle quads crossing the w=0 plane correctly,
// the winding order test is performed in clip space directly,
// before the perspective division (division by w)
// For a convex quad with vertices P0, P1, P2, P3 in sequential order,
// the winding order of the quad is the same as the winding order
// of the triangle P0 P1 P2. The triangle in clip space is used on
// winding test on this first triangle
// Preload clip coordinates into local variables
const float *p0 = RLSW.primitive.buffer[0].position;
const float *p1 = RLSW.primitive.buffer[1].position;
const float *p2 = RLSW.primitive.buffer[2].position;
// NOTE: h3 is not needed for this test
// const float *h3 = RLSW.primitive.buffer[3].position;
// Compute a value proportional to the signed area of the triangle P0 P1 P2
// in the projected 2D plane, calculated directly using clip coordinates
// BEFORE division by w
// This is the determinant of the matrix formed by the (x, y, w) components
// of the vertices P0, P1, and P2. Its sign correctly indicates the winding order
// in clip space and its relationship to the projected 2D winding order,
// even with negative w values
// The determinant formula used here is:
// p0.x*(p1.y*p2.w - p2.y*p1.w) +
// p1.x*(p2.y*p0.w - p0.y*p2.w) +
// p2.x*(p0.y*p1.w - p1.y*p0.w)
const float sgnArea =
p0[0]*(p1[1]*p2[3] - p2[1]*p1[3]) +
p1[0]*(p2[1]*p0[3] - p0[1]*p2[3]) +
p2[0]*(p0[1]*p1[3] - p1[1]*p0[3]);
// Perform face culling based on the winding order determined by the sign
// of the homogeneous area/determinant of triangle P0 P1 P2
// This test is robust for points with w > 0 or w < 0 within the triangle,
// correctly capturing the change in orientation when crossing the w=0 plane
// A positive sgnArea typically corresponds to a counter-clockwise
// winding in the projected space when all w > 0
// A value of 0 for sgnArea means P0, P1, P2 are collinear in (x, y, w)
// space, which corresponds to a degenerate triangle projection
// Such quads might also be degenerate or non-planar
// They are typically not culled by this test (0 < 0 is false, 0 > 0 is false)
// and should be handled by the clipper if necessary
return (RLSW.cullFace == SW_FRONT)? (sgnArea < 0.0f) : (sgnArea > 0.0f); // Cull if winding is "clockwise" : "counter-clockwise"
}
static void sw_quad_clip_and_project(void)
{
sw_vertex_t *polygon = RLSW.primitive.buffer;
int *vertexCounter = &RLSW.primitive.vertexCount;
if (sw_polygon_clip(polygon, vertexCounter))
{
// Transformation to screen space and normalization
for (int i = 0; i < *vertexCounter; i++)
{
sw_vertex_t *v = &polygon[i];
// Calculation of the reciprocal of W for normalization
// as well as perspective-correct attributes
const float wRcp = sw_rcp(v->position[3]);
// Division of XYZ coordinates by weight
v->position[0] *= wRcp;
v->position[1] *= wRcp;
v->position[2] *= wRcp;
v->position[3] = wRcp;
// Division of texture coordinates (perspective-correct)
v->texcoord[0] *= wRcp;
v->texcoord[1] *= wRcp;
// Division of colors (perspective-correct)
v->color[0] *= wRcp;
v->color[1] *= wRcp;
v->color[2] *= wRcp;
v->color[3] *= wRcp;
// Transformation to screen space
sw_project_ndc_to_screen(v->position);
}
}
}
static bool sw_quad_is_axis_aligned(void)
{
// Reject quads with perspective projection
// The fast path assumes affine (non-perspective) quads,
// so it's required for all vertices to have homogeneous w = 1.0
for (int i = 0; i < 4; i++)
{
if (RLSW.primitive.buffer[i].position[3] != 1.0f) return false;
}
// Epsilon tolerance in screen space (pixels)
const float epsilon = 0.5f;
// Fetch screen-space positions for the four quad vertices
const float *p0 = RLSW.primitive.buffer[0].position;
const float *p1 = RLSW.primitive.buffer[1].position;
const float *p2 = RLSW.primitive.buffer[2].position;
const float *p3 = RLSW.primitive.buffer[3].position;
// Compute edge vectors between consecutive vertices
// These define the four sides of the quad in screen space
float dx01 = p1[0] - p0[0], dy01 = p1[1] - p0[1];
float dx12 = p2[0] - p1[0], dy12 = p2[1] - p1[1];
float dx23 = p3[0] - p2[0], dy23 = p3[1] - p2[1];
float dx30 = p0[0] - p3[0], dy30 = p0[1] - p3[1];
// Each edge must be either horizontal or vertical within epsilon tolerance
// If any edge deviates significantly from either axis, the quad is not axis-aligned
if (!((fabsf(dy01) < epsilon) || (fabsf(dx01) < epsilon))) return false;
if (!((fabsf(dy12) < epsilon) || (fabsf(dx12) < epsilon))) return false;
if (!((fabsf(dy23) < epsilon) || (fabsf(dx23) < epsilon))) return false;
if (!((fabsf(dy30) < epsilon) || (fabsf(dx30) < epsilon))) return false;
return true;
}
static void sw_quad_render(uint32_t state)
{
if (RLSW.userState & SW_STATE_CULL_FACE)
{
if (!sw_quad_face_culling()) return;
}
sw_quad_clip_and_project();
if (RLSW.primitive.vertexCount < 3) return;
state &= SW_RASTER_QUAD_STATE_MASK;
if ((RLSW.primitive.vertexCount == 4) && sw_quad_is_axis_aligned())
{
SW_RASTER_QUAD_TABLE[state](
&RLSW.primitive.buffer[0],
&RLSW.primitive.buffer[1],
&RLSW.primitive.buffer[2],
&RLSW.primitive.buffer[3]
);
}
else
{
for (int i = 0; i < RLSW.primitive.vertexCount - 2; i++)
{
SW_RASTER_TRIANGLE_TABLE[state](
&RLSW.primitive.buffer[0],
&RLSW.primitive.buffer[i + 1],
&RLSW.primitive.buffer[i + 2]
);
}
}
}
//-------------------------------------------------------------------------------------------
// Line rendering logic
//-------------------------------------------------------------------------------------------
static bool sw_line_clip_coord(float q, float p, float *t0, float *t1)
{
if (fabsf(p) < SW_CLIP_EPSILON)
{
// Check if the line is entirely outside the window
if (q < -SW_CLIP_EPSILON) return 0; // Completely outside
return 1; // Completely inside or on the edges
}
const float r = q/p;
if (p < 0)
{
if (r > *t1) return 0;
if (r > *t0) *t0 = r;
}
else
{
if (r < *t0) return 0;
if (r < *t1) *t1 = r;
}
return 1;
}
static bool sw_line_clip(sw_vertex_t *v0, sw_vertex_t *v1)
{
float t0 = 0.0f, t1 = 1.0f;
float dH[4] = { 0 };
float dC[4] = { 0 };
for (int i = 0; i < 4; i++)
{
dH[i] = v1->position[i] - v0->position[i];
dC[i] = v1->color[i] - v0->color[i];
}
// Clipping Liang-Barsky
if (!sw_line_clip_coord(v0->position[3] - v0->position[0], -dH[3] + dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[3] + v0->position[0], -dH[3] - dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[3] - v0->position[1], -dH[3] + dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[3] + v0->position[1], -dH[3] - dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[3] - v0->position[2], -dH[3] + dH[2], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[3] + v0->position[2], -dH[3] - dH[2], &t0, &t1)) return false;
// Clipping Scissor
if (RLSW.userState & SW_STATE_SCISSOR_TEST)
{
if (!sw_line_clip_coord(v0->position[0] - RLSW.scClipMin[0]*v0->position[3], RLSW.scClipMin[0]*dH[3] - dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(RLSW.scClipMax[0]*v0->position[3] - v0->position[0], dH[0] - RLSW.scClipMax[0]*dH[3], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->position[1] - RLSW.scClipMin[1]*v0->position[3], RLSW.scClipMin[1]*dH[3] - dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(RLSW.scClipMax[1]*v0->position[3] - v0->position[1], dH[1] - RLSW.scClipMax[1]*dH[3], &t0, &t1)) return false;
}
// Interpolation of new coordinates
if (t1 < 1.0f)
{
for (int i = 0; i < 4; i++)
{
v1->position[i] = v0->position[i] + t1*dH[i];
v1->color[i] = v0->color[i] + t1*dC[i];
}
}
if (t0 > 0.0f)
{
for (int i = 0; i < 4; i++)
{
v0->position[i] += t0*dH[i];
v0->color[i] += t0*dC[i];
}
}
return true;
}
static bool sw_line_clip_and_project(sw_vertex_t *v0, sw_vertex_t *v1)
{
if (!sw_line_clip(v0, v1)) return false;
// Convert clip coordinates to NDC
v0->position[3] = sw_rcp(v0->position[3]);
v1->position[3] = sw_rcp(v1->position[3]);
for (int i = 0; i < 3; i++)
{
v0->position[i] *= v0->position[3];
v1->position[i] *= v1->position[3];
}
// Convert NDC coordinates to screen space
sw_project_ndc_to_screen(v0->position);
sw_project_ndc_to_screen(v1->position);
// NDC +1.0 projects to exactly (width + 0.5f), which truncates out of bounds
// The clamp is at most 0.5px on a boundary endpoint, it's visually imperceptible
v0->position[0] = sw_clamp(v0->position[0], 0.0f, (float)(RLSW.colorBuffer->width - 1) + 0.5f);
v0->position[1] = sw_clamp(v0->position[1], 0.0f, (float)(RLSW.colorBuffer->height - 1) + 0.5f);
v1->position[0] = sw_clamp(v1->position[0], 0.0f, (float)(RLSW.colorBuffer->width - 1) + 0.5f);
v1->position[1] = sw_clamp(v1->position[1], 0.0f, (float)(RLSW.colorBuffer->height - 1) + 0.5f);
return true;
}
static void sw_line_render(uint32_t state, sw_vertex_t *vertices)
{
if (!sw_line_clip_and_project(&vertices[0], &vertices[1])) return;
state &= SW_RASTER_LINE_STATE_MASK;
SW_RASTER_LINE_TABLE[state](&vertices[0], &vertices[1]);
}
//-------------------------------------------------------------------------------------------
// Point rendering logic
//-------------------------------------------------------------------------------------------
static bool sw_point_clip_and_project(sw_vertex_t *v)
{
if (v->position[3] != 1.0f)
{
for (int_fast8_t i = 0; i < 3; i++)
{
if ((v->position[i] < -v->position[3]) || (v->position[i] > v->position[3])) return false;
}
v->position[3] = sw_rcp(v->position[3]);
v->position[0] *= v->position[3];
v->position[1] *= v->position[3];
v->position[2] *= v->position[3];
}
sw_project_ndc_to_screen(v->position);
int min[2] = { 0, 0 };
int max[2] = { RLSW.colorBuffer->width, RLSW.colorBuffer->height };
if (RLSW.userState & SW_STATE_SCISSOR_TEST)
{
min[0] = sw_clamp_int(RLSW.scMin[0], 0, RLSW.colorBuffer->width);
min[1] = sw_clamp_int(RLSW.scMin[1], 0, RLSW.colorBuffer->height);
max[0] = sw_clamp_int(RLSW.scMax[0], 0, RLSW.colorBuffer->width);
max[1] = sw_clamp_int(RLSW.scMax[1], 0, RLSW.colorBuffer->height);
}
bool insideX = (v->position[0] - RLSW.pointRadius < max[0]) && (v->position[0] + RLSW.pointRadius > min[0]);
bool insideY = (v->position[1] - RLSW.pointRadius < max[1]) && (v->position[1] + RLSW.pointRadius > min[1]);
return (insideX && insideY);
}
static void sw_point_render(uint32_t state, sw_vertex_t *v)
{
if (!sw_point_clip_and_project(v)) return;
state &= SW_RASTER_POINT_STATE_MASK;
SW_RASTER_POINT_TABLE[state](v);
}
//-------------------------------------------------------------------------------------------
// Polygon modes rendering logic
//-------------------------------------------------------------------------------------------
static void sw_poly_point_render(uint32_t state)
{
for (int i = 0; i < RLSW.primitive.vertexCount; i++) sw_point_render(state, &RLSW.primitive.buffer[i]);
}
static void sw_poly_line_render(uint32_t state)
{
const sw_vertex_t *vertices = RLSW.primitive.buffer;
int cm1 = RLSW.primitive.vertexCount - 1;
for (int i = 0; i < cm1; i++)
{
sw_vertex_t verts[2] = { vertices[i], vertices[i + 1] };
sw_line_render(state, verts);
}
sw_vertex_t verts[2] = { vertices[cm1], vertices[0] };
sw_line_render(state, verts);
}
static void sw_poly_fill_render(uint32_t state)
{
switch (RLSW.drawMode)
{
case SW_POINTS: sw_point_render(state, &RLSW.primitive.buffer[0]); break;
case SW_LINES: sw_line_render(state, RLSW.primitive.buffer); break;
case SW_TRIANGLES: sw_triangle_render(state); break;
case SW_QUADS: sw_quad_render(state); break;
default: break;
}
}
//-------------------------------------------------------------------------------------------
// Immediate rendering logic
//-------------------------------------------------------------------------------------------
static void sw_immediate_begin(SWdraw mode)
{
// NOTE: Any checks to ensure command recording can start must be performed before calling this function
// Recalculate the MVP if this is needed
if (RLSW.isDirtyMVP)
{
sw_matrix_mul_rst(RLSW.matMVP,
RLSW.stackModelview[RLSW.stackModelviewCounter - 1],
RLSW.stackProjection[RLSW.stackProjectionCounter - 1]);
#ifdef SW_HAS_ESP_DSP
// Pre-transpose to row-major so dspm_mult_4x4x1_f32(matMVP_rm, v, out)
// computes M*v directly in the per-vertex hot path; 16 scalar copies
// per MVP update vs saving ~20 cycles per vertex transform
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
RLSW.matMVP_rm[4*i + j] = RLSW.matMVP[4*j + i];
}
}
#endif
RLSW.isDirtyMVP = false;
}
// Disable pipeline states that are incompatible with the global state
uint32_t state = RLSW.userState;
if (!sw_is_texture_complete(RLSW.depthBuffer)) state &= ~SW_STATE_DEPTH_TEST;
if (!sw_is_texture_complete(RLSW.boundTexture)) state &= ~SW_STATE_TEXTURE_2D;
else if (sw_pixel_is_depth_format(RLSW.boundTexture->format)) state &= ~SW_STATE_TEXTURE_2D;
// Initialize required values
RLSW.primitive.hasColorAlpha = false;
RLSW.primitive.vertexCount = 0;
RLSW.rasterState = state;
RLSW.drawMode = mode;
}
static bool sw_immediate_is_active(void)
{
return (RLSW.drawMode != SW_DRAW_INVALID);
}
static void sw_immediate_set_color(const float color[4])
{
RLSW.primitive.color[0] = color[0];
RLSW.primitive.color[1] = color[1];
RLSW.primitive.color[2] = color[2];
RLSW.primitive.color[3] = color[3];
}
static void sw_immediate_set_texcoord(const float texcoord[2])
{
const float *m = RLSW.stackTexture[RLSW.stackTextureCounter - 1];
RLSW.primitive.texcoord[0] = m[0]*texcoord[0] + m[4]*texcoord[1] + m[12];
RLSW.primitive.texcoord[1] = m[1]*texcoord[0] + m[5]*texcoord[1] + m[13];
}
static void sw_immediate_push_vertex(const float position[4])
{
// Check if the draw mode is valid
if (!sw_is_draw_mode_valid(RLSW.drawMode))
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
// Gets the current vertex
sw_vertex_t *vertex = &RLSW.primitive.buffer[RLSW.primitive.vertexCount++];
// Calculate clip coordinates
#ifdef SW_HAS_ESP_DSP
// dspm_mult_4x4x1_f32 declares its inputs non-const; rlsw treats them as
// read-only and the cast is safe (the kernel only loads from B)
dspm_mult_4x4x1_f32(RLSW.matMVP_rm, (float *)position, vertex->position);
#else
const float *m = RLSW.matMVP;
vertex->position[0] = m[0]*position[0] + m[4]*position[1] + m[8]*position[2] + m[12]*position[3];
vertex->position[1] = m[1]*position[0] + m[5]*position[1] + m[9]*position[2] + m[13]*position[3];
vertex->position[2] = m[2]*position[0] + m[6]*position[1] + m[10]*position[2] + m[14]*position[3];
vertex->position[3] = m[3]*position[0] + m[7]*position[1] + m[11]*position[2] + m[15]*position[3];
#endif
// Copy the attributes in the current vertex
for (int i = 0; i < 4; i++) vertex->color[i] = RLSW.primitive.color[i];
for (int i = 0; i < 2; i++) vertex->texcoord[i] = RLSW.primitive.texcoord[i];
// Track whether any vertex in this primitive has alpha < 1.0
RLSW.primitive.hasColorAlpha |= (vertex->color[3] < 1.0f);
// Immediate rendering of the primitive if the required number is reached
if (RLSW.primitive.vertexCount == SW_PRIMITIVE_VERTEX_COUNT[RLSW.drawMode])
{
uint32_t state = RLSW.rasterState;
// Reduces blend mode costs when it's possible
if (state & SW_STATE_BLEND)
{
if (RLSW.blendFlags & SW_BLEND_FLAG_NOOP) state &= ~SW_STATE_BLEND;
else if ((RLSW.blendFlags & SW_BLEND_FLAG_NEEDS_ALPHA) && (!RLSW.primitive.hasColorAlpha))
{
if (!(state & SW_STATE_TEXTURE_2D) || (RLSW.boundTexture->alpha == SW_PIXEL_ALPHA_NONE)) state &= ~SW_STATE_BLEND;
}
}
// Determine whether colors should be interpolated
const float *ref = RLSW.primitive.buffer[0].color;
for (int i = 1; i < RLSW.primitive.vertexCount; ++i)
{
const float *c = RLSW.primitive.buffer[i].color;
if (c[0] != ref[0] || c[1] != ref[1] || c[2] != ref[2] || c[3] != ref[3])
{
state |= SW_STATE_COLOR_INTERP;
break;
}
}
switch (RLSW.polyMode)
{
case SW_FILL: sw_poly_fill_render(state); break;
case SW_LINE: sw_poly_line_render(state); break;
case SW_POINT: sw_poly_point_render(state); break;
default: break;
}
RLSW.primitive.hasColorAlpha = false;
RLSW.primitive.vertexCount = 0;
}
}
static void sw_immediate_end(void)
{
RLSW.drawMode = SW_DRAW_INVALID;
}
//-------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
bool swInit(int w, int h)
{
if (!sw_default_framebuffer_alloc(&RLSW.framebuffer, w, h))
{
swClose();
return false;
}
if (!sw_pool_init(&RLSW.framebufferPool, RLSW_MAX_FRAMEBUFFERS, sizeof(sw_framebuffer_t)))
{
swClose();
return false;
}
if (!sw_pool_init(&RLSW.texturePool, RLSW_MAX_TEXTURES, sizeof(sw_texture_t)))
{
swClose();
return false;
}
RLSW.colorBuffer = &RLSW.framebuffer.color;
RLSW.depthBuffer = &RLSW.framebuffer.depth;
swViewport(0, 0, w, h);
swScissor(0, 0, w, h);
RLSW.clearColor[0] = 0.0f;
RLSW.clearColor[1] = 0.0f;
RLSW.clearColor[2] = 0.0f;
RLSW.clearColor[3] = 1.0f;
RLSW.clearDepth = 1.0f;
RLSW.currentMatrixMode = SW_MODELVIEW;
RLSW.currentMatrix = &RLSW.stackModelview[0];
sw_matrix_id(RLSW.stackProjection[0]);
sw_matrix_id(RLSW.stackModelview[0]);
sw_matrix_id(RLSW.stackTexture[0]);
sw_matrix_id(RLSW.matMVP);
RLSW.stackProjectionCounter = 1;
RLSW.stackModelviewCounter = 1;
RLSW.stackTextureCounter = 1;
RLSW.isDirtyMVP = false;
RLSW.primitive.texcoord[0] = 0.0f;
RLSW.primitive.texcoord[1] = 0.0f;
RLSW.primitive.color[0] = 1.0f;
RLSW.primitive.color[1] = 1.0f;
RLSW.primitive.color[2] = 1.0f;
RLSW.primitive.color[3] = 1.0f;
RLSW.srcFactor = SW_SRC_ALPHA;
RLSW.dstFactor = SW_ONE_MINUS_SRC_ALPHA;
RLSW.blendFunc = sw_blend_SRC_ALPHA_ONE_MINUS_SRC_ALPHA;
RLSW.drawMode = SW_DRAW_INVALID;
RLSW.polyMode = SW_FILL;
RLSW.cullFace = SW_BACK;
#if RLSW_USE_COLOR_LUT
for (int i = 0; i < 256; i++) SW_LUT_UINT8_TO_FLOAT[i] = (float)i*SW_INV_255;
#endif
SW_LOG("INFO: RLSW: Software renderer initialized successfully\n");
#if defined(SW_HAS_FMA_AVX) && defined(SW_HAS_FMA_AVX2)
SW_LOG("INFO: RLSW: Using SIMD instructions: FMA AVX\n");
#endif
#if defined(SW_HAS_AVX) || defined(SW_HAS_AVX2)
SW_LOG("INFO: RLSW: Using SIMD instructions: AVX\n");
#endif
#if defined(SW_HAS_SSE) || defined(SW_HAS_SSE2) || defined(SW_HAS_SSE3) || defined(SW_HAS_SSSE3) || defined(SW_HAS_SSE41) || defined(SW_HAS_SSE42)
SW_LOG("INFO: RLSW: Using SIMD instructions: SSE\n");
#endif
#if defined(SW_HAS_NEON_FMA) || defined(SW_HAS_NEON)
SW_LOG("INFO: RLSW: Using SIMD instructions: NEON\n");
#endif
#if defined(SW_HAS_RVV)
SW_LOG("INFO: RLSW: Using SIMD instructions: RVV\n");
#endif
return true;
}
void swClose(void)
{
for (int i = 1; i < RLSW.texturePool.watermark; i++)
{
if (RLSW.texturePool.gen[i] & SW_POOL_SLOT_LIVE)
{
sw_texture_free((sw_texture_t *)RLSW.texturePool.data + i);
}
}
sw_pool_destroy(&RLSW.texturePool);
sw_pool_destroy(&RLSW.framebufferPool);
sw_default_framebuffer_free(&RLSW.framebuffer);
RLSW = SW_CURLY_INIT(sw_context_t) { 0 };
}
bool swResize(int w, int h)
{
return sw_default_framebuffer_alloc(&RLSW.framebuffer, w, h);
}
void swReadPixels(int x, int y, int w, int h, SWformat format, SWtype type, void *pixels)
{
// REVIEW: Handle depth buffer copy here or consider it as an error ?
if (format == SW_DEPTH_COMPONENT) { RLSW.errCode = SW_INVALID_ENUM; return; }
sw_pixelformat_t pFormat = (sw_pixelformat_t)sw_pixel_get_format(format, type);
if (pFormat <= SW_PIXELFORMAT_UNKNOWN) { RLSW.errCode = SW_INVALID_ENUM; return; }
if (w <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (h <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (w > RLSW.colorBuffer->width) w = RLSW.colorBuffer->width;
if (h > RLSW.colorBuffer->height) h = RLSW.colorBuffer->height;
x = sw_clamp_int(x, 0, w);
y = sw_clamp_int(y, 0, h);
if ((x >= w) || (y >= h)) return;
if ((pFormat == SW_FRAMEBUFFER_COLOR_FORMAT) && (x == 0) && (y == 0) && (w == RLSW.colorBuffer->width) && (h == RLSW.colorBuffer->height))
{
sw_framebuffer_output_fast(pixels, RLSW.colorBuffer);
}
else
{
sw_framebuffer_output_copy(pixels, RLSW.colorBuffer, x, y, w, h, pFormat);
}
}
void swBlitPixels(int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, SWformat format, SWtype type, void *pixels)
{
// REVIEW: Handle depth buffer copy here or consider it as an error ?
if (format == SW_DEPTH_COMPONENT) { RLSW.errCode = SW_INVALID_ENUM; return; }
sw_pixelformat_t pFormat = (sw_pixelformat_t)sw_pixel_get_format(format, type);
if (pFormat <= SW_PIXELFORMAT_UNKNOWN) { RLSW.errCode = SW_INVALID_ENUM; return; }
if (wSrc <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (hSrc <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (wSrc > RLSW.colorBuffer->width) wSrc = RLSW.colorBuffer->width;
if (hSrc > RLSW.colorBuffer->height) hSrc = RLSW.colorBuffer->height;
xSrc = sw_clamp_int(xSrc, 0, wSrc);
ySrc = sw_clamp_int(ySrc, 0, hSrc);
// Check if the sizes are identical after clamping the source to avoid unexpected issues
// TODO: REVIEW: This repeats the operations if true, so a copy function can be made without these checks
if ((xDst == xSrc) && (yDst == ySrc) && (wDst == wSrc) && (hDst == hSrc))
{
swReadPixels(xSrc, ySrc, wSrc, hSrc, format, type, pixels);
}
else
{
sw_framebuffer_output_blit(pixels, RLSW.colorBuffer, xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, pFormat);
}
}
// Get framefuffer pixel data pointer and size
void *swGetColorBuffer(int *width, int *height)
{
if (width != NULL) *width = RLSW.framebuffer.color.width;
if (height != NULL) *height = RLSW.framebuffer.color.height;
return RLSW.framebuffer.color.pixels;
}
void swSwapColorBuffers(void)
{
#if RLSW_DOUBLE_BUFFERING
sw_texture_t tmp = RLSW.framebuffer.color;
RLSW.framebuffer.color = RLSW.framebuffer.backColor;
RLSW.framebuffer.backColor = tmp;
// Only needs to know about current colorBuffer.
RLSW.colorBuffer = &RLSW.framebuffer.color;
#else
SW_LOG("WARNING: RLSW: swSwapColorBuffers not enabled (Define RLSW_DOUBLE_BUFFERING=1)\n");
#endif
}
void swEnable(SWstate state)
{
switch (state)
{
case SW_SCISSOR_TEST: RLSW.userState |= SW_STATE_SCISSOR_TEST; break;
case SW_TEXTURE_2D: RLSW.userState |= SW_STATE_TEXTURE_2D; break;
case SW_DEPTH_TEST: RLSW.userState |= SW_STATE_DEPTH_TEST; break;
case SW_CULL_FACE: RLSW.userState |= SW_STATE_CULL_FACE; break;
case SW_BLEND: RLSW.userState |= SW_STATE_BLEND; break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swDisable(SWstate state)
{
switch (state)
{
case SW_SCISSOR_TEST: RLSW.userState &= ~SW_STATE_SCISSOR_TEST; break;
case SW_TEXTURE_2D: RLSW.userState &= ~SW_STATE_TEXTURE_2D; break;
case SW_DEPTH_TEST: RLSW.userState &= ~SW_STATE_DEPTH_TEST; break;
case SW_CULL_FACE: RLSW.userState &= ~SW_STATE_CULL_FACE; break;
case SW_BLEND: RLSW.userState &= ~SW_STATE_BLEND; break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swGetIntegerv(SWget name, int *v)
{
switch (name)
{
case SW_MODELVIEW_STACK_DEPTH: *v = SW_MODELVIEW_STACK_DEPTH; break;
case SW_PROJECTION_STACK_DEPTH: *v = SW_PROJECTION_STACK_DEPTH; break;
case SW_TEXTURE_STACK_DEPTH: *v = SW_TEXTURE_STACK_DEPTH; break;
case SW_DRAW_FRAMEBUFFER_BINDING: *v = RLSW.boundFramebufferId; break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swGetFloatv(SWget name, float *v)
{
switch (name)
{
case SW_COLOR_CLEAR_VALUE:
{
v[0] = RLSW.clearColor[0];
v[1] = RLSW.clearColor[1];
v[2] = RLSW.clearColor[2];
v[3] = RLSW.clearColor[3];
} break;
case SW_DEPTH_CLEAR_VALUE:
{
v[0] = RLSW.clearDepth;
} break;
case SW_CURRENT_COLOR:
{
v[0] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].color[0];
v[1] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].color[1];
v[2] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].color[2];
v[3] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].color[3];
} break;
case SW_CURRENT_TEXTURE_COORDS:
{
v[0] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].texcoord[0];
v[1] = RLSW.primitive.buffer[RLSW.primitive.vertexCount - 1].texcoord[1];
} break;
case SW_POINT_SIZE:
{
v[0] = 2.0f*RLSW.pointRadius;
} break;
case SW_LINE_WIDTH:
{
v[0] = RLSW.lineWidth;
} break;
case SW_MODELVIEW_MATRIX:
{
for (int i = 0; i < 16; i++) v[i] = RLSW.stackModelview[RLSW.stackModelviewCounter - 1][i];
} break;
case SW_PROJECTION_MATRIX:
{
for (int i = 0; i < 16; i++) v[i] = RLSW.stackProjection[RLSW.stackProjectionCounter - 1][i];
} break;
case SW_TEXTURE_MATRIX:
{
for (int i = 0; i < 16; i++) v[i] = RLSW.stackTexture[RLSW.stackTextureCounter - 1][i];
} break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
const char *swGetString(SWget name)
{
const char *result = NULL;
switch (name)
{
case SW_VENDOR: result = "RLSW"; break;
case SW_RENDERER: result = "RLSW OpenGL Software Renderer"; break;
case SW_VERSION: result = RLSW_VERSION; break;
case SW_EXTENSIONS: result = "None"; break;
case SW_SHADING_LANGUAGE_VERSION: result = "Not supported"; break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
return result;
}
SWerrcode swGetError(void)
{
SWerrcode ret = RLSW.errCode;
RLSW.errCode = SW_NO_ERROR;
return ret;
}
void swViewport(int x, int y, int width, int height)
{
if ((width < 0) || (height < 0))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
RLSW.vpSize[0] = width;
RLSW.vpSize[1] = height;
RLSW.vpHalf[0] = width/2.0f;
RLSW.vpHalf[1] = height/2.0f;
RLSW.vpCenter[0] = (float)x + RLSW.vpHalf[0];
RLSW.vpCenter[1] = (float)y + RLSW.vpHalf[1];
}
void swScissor(int x, int y, int width, int height)
{
if ((width < 0) || (height < 0))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
RLSW.scMin[0] = x;
RLSW.scMin[1] = y;
RLSW.scMax[0] = x + width;
RLSW.scMax[1] = y + height;
RLSW.scClipMin[0] = (2.0f*(float)RLSW.scMin[0]/(float)RLSW.vpSize[0]) - 1.0f;
RLSW.scClipMax[0] = (2.0f*(float)RLSW.scMax[0]/(float)RLSW.vpSize[0]) - 1.0f;
RLSW.scClipMin[1] = (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]) - 1.0f;
RLSW.scClipMax[1] = (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]) - 1.0f;
}
void swClearColor(float r, float g, float b, float a)
{
RLSW.clearColor[0] = r;
RLSW.clearColor[1] = g;
RLSW.clearColor[2] = b;
RLSW.clearColor[3] = a;
}
void swClearDepth(float depth)
{
RLSW.clearDepth = depth;
}
void swClear(uint32_t bitmask)
{
if (!sw_is_ready_to_render()) return;
if ((bitmask & (SW_COLOR_BUFFER_BIT)) && (RLSW.colorBuffer != NULL) && (RLSW.colorBuffer->pixels != NULL))
{
sw_framebuffer_fill_color(RLSW.colorBuffer, RLSW.clearColor);
}
// Don't clear back buffer, it might be locked by another core.
if ((bitmask & (SW_DEPTH_BUFFER_BIT)) && (RLSW.depthBuffer != NULL) && (RLSW.depthBuffer->pixels != NULL))
{
sw_framebuffer_fill_depth(RLSW.depthBuffer, RLSW.clearDepth);
}
}
void swBlendFunc(SWfactor sfactor, SWfactor dfactor)
{
int sIndex = sw_blend_factor_index(sfactor);
if (sIndex < 0) { RLSW.errCode = SW_INVALID_ENUM; return; }
int dIndex = sw_blend_factor_index(dfactor);
if (dIndex < 0) { RLSW.errCode = SW_INVALID_ENUM; return; }
RLSW.srcFactor = sfactor;
RLSW.dstFactor = dfactor;
RLSW.blendFlags = sw_blend_compute_flags(sfactor, dfactor);
RLSW.blendFunc = SW_BLEND_TABLE[sIndex][dIndex];
}
void swPolygonMode(SWpoly mode)
{
if (!sw_is_poly_mode_valid(mode))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.polyMode = mode;
}
void swCullFace(SWface face)
{
if (!sw_is_face_valid(face))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.cullFace = face;
}
void swPointSize(float size)
{
RLSW.pointRadius = floorf(size*0.5f);
}
void swLineWidth(float width)
{
RLSW.lineWidth = roundf(width);
}
void swMatrixMode(SWmatrix mode)
{
switch (mode)
{
case SW_PROJECTION: RLSW.currentMatrix = &RLSW.stackProjection[RLSW.stackProjectionCounter - 1]; break;
case SW_MODELVIEW: RLSW.currentMatrix = &RLSW.stackModelview[RLSW.stackModelviewCounter - 1]; break;
case SW_TEXTURE: RLSW.currentMatrix = &RLSW.stackTexture[RLSW.stackTextureCounter - 1]; break;
default: RLSW.errCode = SW_INVALID_ENUM; return;
}
RLSW.currentMatrixMode = mode;
}
void swPushMatrix(void)
{
switch (RLSW.currentMatrixMode)
{
case SW_PROJECTION:
{
if (RLSW.stackProjectionCounter >= RLSW_MAX_PROJECTION_STACK_SIZE)
{
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
int iOld = RLSW.stackProjectionCounter - 1;
int iNew = RLSW.stackProjectionCounter++;
for (int i = 0; i < 16; i++)
{
RLSW.stackProjection[iNew][i] = RLSW.stackProjection[iOld][i];
}
RLSW.currentMatrix = &RLSW.stackProjection[iNew];
} break;
case SW_MODELVIEW:
{
if (RLSW.stackModelviewCounter >= RLSW_MAX_MODELVIEW_STACK_SIZE)
{
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
int iOld = RLSW.stackModelviewCounter - 1;
int iNew = RLSW.stackModelviewCounter++;
for (int i = 0; i < 16; i++)
{
RLSW.stackModelview[iNew][i] = RLSW.stackModelview[iOld][i];
}
RLSW.currentMatrix = &RLSW.stackModelview[iNew];
} break;
case SW_TEXTURE:
{
if (RLSW.stackTextureCounter >= RLSW_MAX_TEXTURE_STACK_SIZE)
{
RLSW.errCode = SW_STACK_OVERFLOW;
return;
}
int iOld = RLSW.stackTextureCounter - 1;
int iNew = RLSW.stackTextureCounter++;
for (int i = 0; i < 16; i++)
{
RLSW.stackTexture[iNew][i] = RLSW.stackTexture[iOld][i];
}
RLSW.currentMatrix = &RLSW.stackTexture[iNew];
} break;
default: break;
}
}
void swPopMatrix(void)
{
switch (RLSW.currentMatrixMode)
{
case SW_PROJECTION:
{
if (RLSW.stackProjectionCounter <= 0)
{
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
RLSW.currentMatrix = &RLSW.stackProjection[(--RLSW.stackProjectionCounter) - 1];
RLSW.isDirtyMVP = true; //< The MVP is considered to have been changed
} break;
case SW_MODELVIEW:
{
if (RLSW.stackModelviewCounter <= 0)
{
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
RLSW.currentMatrix = &RLSW.stackModelview[(--RLSW.stackModelviewCounter) - 1];
RLSW.isDirtyMVP = true; //< The MVP is considered to have been changed
} break;
case SW_TEXTURE:
{
if (RLSW.stackTextureCounter <= 0)
{
RLSW.errCode = SW_STACK_UNDERFLOW;
return;
}
RLSW.currentMatrix = &RLSW.stackTexture[(--RLSW.stackTextureCounter) - 1];
} break;
default: break;
}
}
void swLoadIdentity(void)
{
sw_matrix_id(*RLSW.currentMatrix);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swTranslatef(float x, float y, float z)
{
sw_matrix_t mat = { 0 };
sw_matrix_id(mat);
mat[12] = x;
mat[13] = y;
mat[14] = z;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swRotatef(float angle, float x, float y, float z)
{
angle *= SW_DEG2RAD;
float lengthSq = x*x + y*y + z*z;
if ((lengthSq != 1.0f) && (lengthSq != 0.0f))
{
float invLength = 1.0f/sqrtf(lengthSq);
x *= invLength;
y *= invLength;
z *= invLength;
}
float sinres = sinf(angle);
float cosres = cosf(angle);
float t = 1.0f - cosres;
sw_matrix_t mat = { 0 };
mat[0] = x*x*t + cosres;
mat[1] = y*x*t + z*sinres;
mat[2] = z*x*t - y*sinres;
mat[3] = 0.0f;
mat[4] = x*y*t - z*sinres;
mat[5] = y*y*t + cosres;
mat[6] = z*y*t + x*sinres;
mat[7] = 0.0f;
mat[8] = x*z*t + y*sinres;
mat[9] = y*z*t - x*sinres;
mat[10] = z*z*t + cosres;
mat[11] = 0.0f;
mat[12] = 0.0f;
mat[13] = 0.0f;
mat[14] = 0.0f;
mat[15] = 1.0f;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swScalef(float x, float y, float z)
{
sw_matrix_t mat = { 0 };
mat[0] = x, mat[1] = 0, mat[2] = 0, mat[3] = 0;
mat[4] = 0, mat[5] = y, mat[6] = 0, mat[7] = 0;
mat[8] = 0, mat[9] = 0, mat[10] = z, mat[11] = 0;
mat[12] = 0, mat[13] = 0, mat[14] = 0, mat[15] = 1;
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swMultMatrixf(const float *mat)
{
sw_matrix_mul(*RLSW.currentMatrix, mat, *RLSW.currentMatrix);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swFrustum(double left, double right, double bottom, double top, double znear, double zfar)
{
sw_matrix_t mat = { 0 };
double rl = right - left;
double tb = top - bottom;
double fn = zfar - znear;
mat[0] = (float)(znear*2.0)/rl;
mat[1] = 0.0f;
mat[2] = 0.0f;
mat[3] = 0.0f;
mat[4] = 0.0f;
mat[5] = (float)(znear*2.0)/tb;
mat[6] = 0.0f;
mat[7] = 0.0f;
mat[8] = (float)(right + left)/rl;
mat[9] = (float)(top + bottom)/tb;
mat[10] = -(float)(zfar + znear)/fn;
mat[11] = -1.0f;
mat[12] = 0.0f;
mat[13] = 0.0f;
mat[14] = -(zfar*znear*2.0)/fn;
mat[15] = 0.0f;
sw_matrix_mul(*RLSW.currentMatrix, *RLSW.currentMatrix, mat);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swOrtho(double left, double right, double bottom, double top, double znear, double zfar)
{
sw_matrix_t mat = { 0 };
double rl = right - left;
double tb = top - bottom;
double fn = zfar - znear;
mat[0] = 2.0f/(float)rl;
mat[1] = 0.0f;
mat[2] = 0.0f;
mat[3] = 0.0f;
mat[4] = 0.0f;
mat[5] = 2.0f/(float)tb;
mat[6] = 0.0f;
mat[7] = 0.0f;
mat[8] = 0.0f;
mat[9] = 0.0f;
mat[10] = -2.0f/(float)fn;
mat[11] = 0.0f;
mat[12] = -(float)(left + right)/rl;
mat[13] = -(float)(top + bottom)/tb;
mat[14] = -(float)(zfar + znear)/fn;
mat[15] = 1.0f;
sw_matrix_mul(*RLSW.currentMatrix, *RLSW.currentMatrix, mat);
if (RLSW.currentMatrixMode != SW_TEXTURE) RLSW.isDirtyMVP = true;
}
void swBegin(SWdraw mode)
{
// Check if render is possible
if (!sw_is_ready_to_render())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
// Check if the draw mode is valid
if (!sw_is_draw_mode_valid(mode))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
// Ensures that a recording has not already started (spec)
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
sw_immediate_begin(mode);
}
void swEnd(void)
{
// Ensures that a recording has already started (spec)
if (!sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
sw_immediate_end();
}
void swVertex2i(int x, int y)
{
const float v[4] = { (float)x, (float)y, 0.0f, 1.0f };
sw_immediate_push_vertex(v);
}
void swVertex2f(float x, float y)
{
const float v[4] = { x, y, 0.0f, 1.0f };
sw_immediate_push_vertex(v);
}
void swVertex2fv(const float *v)
{
const float v4[4] = { v[0], v[1], 0.0f, 1.0f };
sw_immediate_push_vertex(v4);
}
void swVertex3i(int x, int y, int z)
{
const float v[4] = { (float)x, (float)y, (float)z, 1.0f };
sw_immediate_push_vertex(v);
}
void swVertex3f(float x, float y, float z)
{
const float v[4] = { x, y, z, 1.0f };
sw_immediate_push_vertex(v);
}
void swVertex3fv(const float *v)
{
const float v4[4] = { v[0], v[1], v[2], 1.0f };
sw_immediate_push_vertex(v4);
}
void swVertex4i(int x, int y, int z, int w)
{
const float v[4] = { (float)x, (float)y, (float)z, (float)w };
sw_immediate_push_vertex(v);
}
void swVertex4f(float x, float y, float z, float w)
{
const float v[4] = { x, y, z, w };
sw_immediate_push_vertex(v);
}
void swVertex4fv(const float *v)
{
sw_immediate_push_vertex(v);
}
void swColor3ub(uint8_t r, uint8_t g, uint8_t b)
{
float cv[4] = { 0 };
cv[0] = (float)r*SW_INV_255;
cv[1] = (float)g*SW_INV_255;
cv[2] = (float)b*SW_INV_255;
cv[3] = 1.0f;
sw_immediate_set_color(cv);
}
void swColor3ubv(const uint8_t *v)
{
float cv[4] = { 0 };
cv[0] = (float)v[0]*SW_INV_255;
cv[1] = (float)v[1]*SW_INV_255;
cv[2] = (float)v[2]*SW_INV_255;
cv[3] = 1.0f;
sw_immediate_set_color(cv);
}
void swColor3f(float r, float g, float b)
{
float cv[4] = { 0 };
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = 1.0f;
sw_immediate_set_color(cv);
}
void swColor3fv(const float *v)
{
float cv[4] = { 0 };
cv[0] = v[0];
cv[1] = v[1];
cv[2] = v[2];
cv[3] = 1.0f;
sw_immediate_set_color(cv);
}
void swColor4ub(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
float cv[4] = { 0 };
cv[0] = (float)r*SW_INV_255;
cv[1] = (float)g*SW_INV_255;
cv[2] = (float)b*SW_INV_255;
cv[3] = (float)a*SW_INV_255;
sw_immediate_set_color(cv);
}
void swColor4ubv(const uint8_t *v)
{
float cv[4] = { 0 };
cv[0] = (float)v[0]*SW_INV_255;
cv[1] = (float)v[1]*SW_INV_255;
cv[2] = (float)v[2]*SW_INV_255;
cv[3] = (float)v[3]*SW_INV_255;
sw_immediate_set_color(cv);
}
void swColor4f(float r, float g, float b, float a)
{
float cv[4] = { 0 };
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = a;
sw_immediate_set_color(cv);
}
void swColor4fv(const float *v)
{
sw_immediate_set_color(v);
}
void swTexCoord2f(float u, float v)
{
const float texcoord[2] = { u, v };
sw_immediate_set_texcoord(texcoord);
}
void swTexCoord2fv(const float *v)
{
sw_immediate_set_texcoord(v);
}
void swBindArray(SWarray type, void *buffer)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
switch (type)
{
case SW_VERTEX_ARRAY: RLSW.array.positions = (float *)buffer; break;
case SW_TEXTURE_COORD_ARRAY: RLSW.array.texcoords = (float *)buffer; break;
case SW_COLOR_ARRAY: RLSW.array.colors = (uint8_t *)buffer; break;
default: break;
}
}
void swDrawArrays(SWdraw mode, int offset, int count)
{
if ((sw_immediate_is_active()) || (!sw_is_ready_to_render()) || (RLSW.array.positions == NULL))
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
sw_immediate_begin(mode);
{
const float *positions = RLSW.array.positions;
const float *texcoords = RLSW.array.texcoords;
const uint8_t *colors = RLSW.array.colors;
int end = offset + count;
for (int i = offset; i < end; i++)
{
if (texcoords) sw_immediate_set_texcoord(&texcoords[2*i]);
if (colors)
{
const uint8_t *c = &colors[4*i];
float color[4] = {
(float)c[0]*SW_INV_255,
(float)c[1]*SW_INV_255,
(float)c[2]*SW_INV_255,
(float)c[3]*SW_INV_255,
};
sw_immediate_set_color(color);
}
const float *p = &positions[3*i];
float position[4] = { p[0], p[1], p[2], 1.0f };
sw_immediate_push_vertex(position);
}
}
sw_immediate_end();
}
void swDrawElements(SWdraw mode, int count, int type, const void *indices)
{
if ((sw_immediate_is_active()) || (!sw_is_ready_to_render()) || (RLSW.array.positions == NULL))
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if ((count < 0) || (indices == NULL))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
if ((type != SW_UNSIGNED_BYTE) && (type != SW_UNSIGNED_SHORT) && (type != SW_UNSIGNED_INT))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
sw_immediate_begin(mode);
{
const float *positions = RLSW.array.positions;
const float *texcoords = RLSW.array.texcoords;
const uint8_t *colors = RLSW.array.colors;
const uint8_t *indicesUb = (type == SW_UNSIGNED_BYTE)? indices : NULL;
const uint16_t *indicesUs = (type == SW_UNSIGNED_SHORT)? indices : NULL;
const uint32_t *indicesUi = (type == SW_UNSIGNED_INT)? indices : NULL;
for (int i = 0; i < count; i++)
{
uint32_t index = indicesUb? (uint32_t)indicesUb[i] : (indicesUs? (uint32_t)indicesUs[i] : (uint32_t)indicesUi[i]);
if (texcoords) sw_immediate_set_texcoord(&texcoords[2*index]);
if (colors)
{
const uint8_t *c = &colors[4*index];
float color[4] = {
(float)c[0]*SW_INV_255,
(float)c[1]*SW_INV_255,
(float)c[2]*SW_INV_255,
(float)c[3]*SW_INV_255,
};
sw_immediate_set_color(color);
}
const float *p = &positions[3*index];
float position[4] = { p[0], p[1], p[2], 1.0f };
sw_immediate_push_vertex(position);
}
}
sw_immediate_end();
}
void swGenTextures(int count, sw_handle_t *textures)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (!count || !textures) return;
for (int i = 0; i < count; i++)
{
sw_handle_t h = sw_pool_alloc(&RLSW.texturePool);
if (h == SW_HANDLE_NULL) { RLSW.errCode = SW_OUT_OF_MEMORY; return; }
textures[i] = h;
}
}
void swDeleteTextures(int count, sw_handle_t *textures)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (!count || !textures) return;
for (int i = 0; i < count; i++)
{
sw_texture_t *tex = sw_pool_get(&RLSW.texturePool, textures[i]);
if (!tex) { RLSW.errCode = SW_INVALID_VALUE; continue; }
if (tex == RLSW.boundTexture) RLSW.boundTexture = NULL;
if (tex == RLSW.colorBuffer) RLSW.colorBuffer = NULL;
if (tex == RLSW.depthBuffer) RLSW.depthBuffer = NULL;
sw_texture_free(tex);
*tex = (sw_texture_t) { 0 };
sw_pool_free(&RLSW.texturePool, textures[i]);
}
}
void swBindTexture(sw_handle_t id)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (id == SW_HANDLE_NULL)
{
RLSW.boundTexture = NULL;
return;
}
if (!sw_is_texture_valid(id))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
RLSW.boundTexture = sw_pool_get(&RLSW.texturePool, id);
}
void swTexStorage2D(int width, int height, SWinternalformat format)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (RLSW.boundTexture == NULL) return;
int pixelFormat = SW_PIXELFORMAT_UNKNOWN;
switch (format)
{
case SW_LUMINANCE8: pixelFormat = SW_PIXELFORMAT_COLOR_GRAYSCALE; break;
case SW_LUMINANCE8_ALPHA8: pixelFormat = SW_PIXELFORMAT_COLOR_GRAYALPHA; break;
case SW_R3_G3_B2: pixelFormat = SW_PIXELFORMAT_COLOR_R3G3B2; break;
case SW_RGB8: pixelFormat = SW_PIXELFORMAT_COLOR_R8G8B8; break;
case SW_RGBA4: pixelFormat = SW_PIXELFORMAT_COLOR_R4G4B4A4; break;
case SW_RGB5_A1: pixelFormat = SW_PIXELFORMAT_COLOR_R5G5B5A1; break;
case SW_RGBA8: pixelFormat = SW_PIXELFORMAT_COLOR_R8G8B8A8; break;
case SW_R16F: pixelFormat = SW_PIXELFORMAT_COLOR_R16; break;
case SW_RGB16F: pixelFormat = SW_PIXELFORMAT_COLOR_R16G16B16; break;
case SW_RGBA16F: pixelFormat = SW_PIXELFORMAT_COLOR_R16G16B16A16; break;
case SW_R32F: pixelFormat = SW_PIXELFORMAT_COLOR_R32; break;
case SW_RGB32F: pixelFormat = SW_PIXELFORMAT_COLOR_R32G32B32; break;
case SW_RGBA32F: pixelFormat = SW_PIXELFORMAT_COLOR_R32G32B32A32; break;
case SW_DEPTH_COMPONENT16: pixelFormat = SW_PIXELFORMAT_DEPTH_D16; break;
case SW_DEPTH_COMPONENT24: pixelFormat = SW_PIXELFORMAT_DEPTH_D32; break;
case SW_DEPTH_COMPONENT32: pixelFormat = SW_PIXELFORMAT_DEPTH_D32; break;
case SW_DEPTH_COMPONENT32F: pixelFormat = SW_PIXELFORMAT_DEPTH_D32; break;
default: RLSW.errCode = SW_INVALID_ENUM; return;
}
(void)sw_texture_alloc(RLSW.boundTexture, NULL, width, height, pixelFormat);
}
void swTexImage2D(int width, int height, SWformat format, SWtype type, const void *data)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (RLSW.boundTexture == NULL) return;
int pixelFormat = sw_pixel_get_format(format, type);
if (pixelFormat <= SW_PIXELFORMAT_UNKNOWN) { RLSW.errCode = SW_INVALID_ENUM; return; }
(void)sw_texture_alloc(RLSW.boundTexture, data, width, height, pixelFormat);
}
void swTexSubImage2D(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *pixels)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (!sw_is_texture_complete(RLSW.boundTexture) || (!pixels) || (width <= 0) || (height <= 0))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
if ((x < 0) || (y < 0) || (x + width > RLSW.boundTexture->width) || (y + height > RLSW.boundTexture->height))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
sw_pixel_write_color_f writeColor = sw_pixel_get_write_color_func(RLSW.boundTexture->format);
if (writeColor == NULL) // probably a depth format
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
sw_pixelformat_t srcPixelFormat = sw_pixel_get_format(format, type);
sw_pixel_read_color_f readColor = sw_pixel_get_read_color_func(srcPixelFormat);
if (readColor == NULL)
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
const int srcPixelSize = SW_PIXELFORMAT_SIZE[srcPixelFormat];
const int dstPixelSize = SW_PIXELFORMAT_SIZE[RLSW.boundTexture->format];
const uint8_t *srcBytes = (const uint8_t *)pixels;
uint8_t *dstBytes = (uint8_t *)RLSW.boundTexture->pixels;
if (srcPixelFormat == RLSW.boundTexture->format)
{
const int rowSize = width*dstPixelSize;
const int dstStride = RLSW.boundTexture->width*dstPixelSize;
const int srcStride = width*srcPixelSize;
uint8_t *dstRow = dstBytes + (y*RLSW.boundTexture->width + x)*dstPixelSize;
const uint8_t *srcRow = srcBytes;
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < rowSize; ++i) dstRow[i] = srcRow[i];
dstRow += dstStride;
srcRow += srcStride;
}
return;
}
bool alphaFound = false;
for (int j = 0; j < height; ++j)
{
for (int i = 0; i < width; ++i)
{
float color[4];
const int srcPixelOffset = ((j*width) + i)*srcPixelSize;
const int dstPixelOffset = (((y + j)*RLSW.boundTexture->width) + (x + i))*dstPixelSize;
readColor(color, srcBytes, srcPixelOffset);
alphaFound |= (color[3] < 1.0f);
writeColor(dstBytes, color, dstPixelOffset);
}
}
RLSW.boundTexture->alpha = alphaFound? SW_PIXELFORMAT_ALPHA[srcPixelFormat] : SW_PIXEL_ALPHA_NONE;
}
void swTexParameteri(int param, int value)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (RLSW.boundTexture == NULL) return;
switch (param)
{
case SW_TEXTURE_MIN_FILTER:
{
if (!sw_is_texture_filter_valid(value)) { RLSW.errCode = SW_INVALID_ENUM; return; }
RLSW.boundTexture->minFilter = (SWfilter)value;
} break;
case SW_TEXTURE_MAG_FILTER:
{
if (!sw_is_texture_filter_valid(value)) { RLSW.errCode = SW_INVALID_ENUM; return; }
RLSW.boundTexture->magFilter = (SWfilter)value;
} break;
case SW_TEXTURE_WRAP_S:
{
if (!sw_is_texture_wrap_valid(value)) { RLSW.errCode = SW_INVALID_ENUM; return; }
#if !RLSW_SUPPORT_NPOT_TEXTURE
if (value == SW_REPEAT && (RLSW.boundTexture->width & RLSW.boundTexture->wMinus1) != 0)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
#endif
RLSW.boundTexture->sWrap = (SWwrap)value;
} break;
case SW_TEXTURE_WRAP_T:
{
if (!sw_is_texture_wrap_valid(value)) { RLSW.errCode = SW_INVALID_ENUM; return; }
#if !RLSW_SUPPORT_NPOT_TEXTURE
if (value == SW_REPEAT && (RLSW.boundTexture->height & RLSW.boundTexture->hMinus1) != 0)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
#endif
RLSW.boundTexture->tWrap = (SWwrap)value;
} break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swGenFramebuffers(int count, uint32_t *framebuffers)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (!count || !framebuffers) return;
for (int i = 0; i < count; i++)
{
sw_handle_t h = sw_pool_alloc(&RLSW.framebufferPool);
if (h == SW_HANDLE_NULL) { RLSW.errCode = SW_OUT_OF_MEMORY; return; }
framebuffers[i] = h;
}
}
void swDeleteFramebuffers(int count, uint32_t *framebuffers)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (!count || !framebuffers) return;
for (int i = 0; i < count; i++)
{
sw_framebuffer_t *fb = sw_pool_get(&RLSW.framebufferPool, framebuffers[i]);
if (!fb) { RLSW.errCode = SW_INVALID_VALUE; continue; }
if (framebuffers[i] == RLSW.boundFramebufferId)
{
RLSW.boundFramebufferId = SW_HANDLE_NULL;
RLSW.colorBuffer = &RLSW.framebuffer.color;
RLSW.depthBuffer = &RLSW.framebuffer.depth;
}
sw_pool_free(&RLSW.framebufferPool, framebuffers[i]);
}
}
void swBindFramebuffer(uint32_t id)
{
if (sw_immediate_is_active())
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (id == SW_HANDLE_NULL)
{
RLSW.boundFramebufferId = SW_HANDLE_NULL;
RLSW.colorBuffer = &RLSW.framebuffer.color;
RLSW.depthBuffer = &RLSW.framebuffer.depth;
return;
}
sw_framebuffer_t *fb = sw_pool_get(&RLSW.framebufferPool, id);
if (fb == NULL)
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
RLSW.boundFramebufferId = id;
RLSW.colorBuffer = sw_pool_get(&RLSW.texturePool, fb->colorAttachment);
// No back buffer available for binding rendertextures.
RLSW.depthBuffer = sw_pool_get(&RLSW.texturePool, fb->depthAttachment);
}
void swFramebufferTexture2D(SWattachment attach, uint32_t texture)
{
if ((sw_immediate_is_active()) || (RLSW.boundFramebufferId == SW_HANDLE_NULL))
{
RLSW.errCode = SW_INVALID_OPERATION; // not really standard but hey
return;
}
sw_framebuffer_t *fb = sw_pool_get(&RLSW.framebufferPool, RLSW.boundFramebufferId);
if (fb == NULL) return; // Should never happen
switch (attach)
{
case SW_COLOR_ATTACHMENT:
{
fb->colorAttachment = texture;
RLSW.colorBuffer = sw_pool_get(&RLSW.texturePool, texture);
} break;
case SW_DEPTH_ATTACHMENT:
{
fb->depthAttachment = texture;
RLSW.depthBuffer = sw_pool_get(&RLSW.texturePool, texture);
} break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
SWfbstatus swCheckFramebufferStatus(void)
{
if (RLSW.boundFramebufferId == SW_HANDLE_NULL) return SW_FRAMEBUFFER_COMPLETE;
if (RLSW.colorBuffer == NULL) return SW_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
if (!sw_is_texture_complete(RLSW.colorBuffer)) return SW_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
if (RLSW.colorBuffer->format != SW_FRAMEBUFFER_COLOR_FORMAT) return SW_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
if (RLSW.depthBuffer)
{
if (!sw_is_texture_complete(RLSW.depthBuffer)) return SW_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
if (RLSW.depthBuffer->format != SW_FRAMEBUFFER_DEPTH_FORMAT) return SW_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
if ((RLSW.colorBuffer->width != RLSW.depthBuffer->width) ||
(RLSW.colorBuffer->height != RLSW.depthBuffer->height)) return SW_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
}
return SW_FRAMEBUFFER_COMPLETE;
}
void swGetFramebufferAttachmentParameteriv(SWattachment attachment, SWattachget property, int *v)
{
if (RLSW.boundFramebufferId == SW_HANDLE_NULL)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (v == NULL)
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
sw_framebuffer_t *fb = sw_pool_get(&RLSW.framebufferPool, RLSW.boundFramebufferId);
if (fb == NULL) return; // Should never happen
switch (property)
{
case SW_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
{
if (attachment == SW_COLOR_ATTACHMENT) *v = fb->colorAttachment;
else if (attachment == SW_DEPTH_ATTACHMENT) *v = fb->depthAttachment;
} break;
case SW_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE: *v = GL_TEXTURE; break;
default: break;
}
}
#endif // RLSW_IMPLEMENTATION
//----------------------------------------------------------------------------------
// Template Rasterization Functions
//----------------------------------------------------------------------------------
// Triangle rasterization functions
//-------------------------------------------------------------------------------------------
#ifdef SW_RASTER_TRIANGLE_STATES
#define SW_RASTER_TRIANGLE_FLAGS SW_FLAGS(SW_RASTER_TRIANGLE_STATES)
#define SW_RASTER_TRIANGLE_SPAN SW_CONCATX(sw_raster_triangle_span_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
#define SW_RASTER_TRIANGLE SW_CONCATX(sw_raster_triangle_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
#define SW_SPAN_CTX SW_CONCATX(sw_span_ctx_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
// True when a perspective-correct interpolation pass is needed (color or UVs);
// lets SPAN skip all w-tracking and block subdivision otherwise
#define SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE \
(((SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP) || ((SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D))
#define SW_GRAD SW_CONCATX(sw_grad_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
#define SW_VADD SW_CONCATX(sw_vadd_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
#define SW_VMAD SW_CONCATX(sw_vmad_, SW_NAME(SW_RASTER_TRIANGLE_STATES))
// Per-triangle constants reused by every scanline: attribute x-derivatives
// (constant across a planar triangle) plus whatever is fixed once and for
// all when its interpolation is disabled (flat color, resolved sampler)
typedef struct
{
#if SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE
float dWdx;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
float dZdx;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
float dCdx[4];
#else
float flatColor[4];
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
float dTdx[2];
float dTdy[2];
sw_texture_sampler_f sample;
#endif
} SW_SPAN_CTX;
static SW_INLINE void SW_GRAD(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT a, const sw_vertex_t *SW_RESTRICT b, float scale)
{
SW_VEC_OP(out->position[i] = (b->position[i] - a->position[i])*scale, i, 4);
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(out->color[i] = (b->color[i] - a->color[i])*scale, i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(out->texcoord[i] = (b->texcoord[i] - a->texcoord[i])*scale, i, 2);
#endif
}
static SW_INLINE void SW_VADD(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT inc)
{
SW_VEC_OP(out->position[i] += inc->position[i], i, 4);
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(out->color[i] += inc->color[i], i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(out->texcoord[i] += inc->texcoord[i], i, 2);
#endif
}
static SW_INLINE void SW_VMAD(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT inc, float scale)
{
SW_VEC_OP(out->position[i] += inc->position[i]*scale, i, 4);
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(out->color[i] += inc->color[i]*scale, i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(out->texcoord[i] += inc->texcoord[i]*scale, i, 2);
#endif
}
static void SW_RASTER_TRIANGLE_SPAN(const sw_vertex_t *start, const sw_vertex_t *end, const SW_SPAN_CTX *ctx)
{
// Skip rows outside the framebuffer; can only trigger on FP rounding at
// clip boundaries since triangles are already clipped to the viewport
int y = (int)start->position[1];
if (y < 0 || y >= RLSW.colorBuffer->height) return;
// Gets the start/end coordinates and skip empty lines
int xStart = (int)start->position[0];
int xEnd = (int)end->position[0];
if (xStart == xEnd) return;
// Intercept the span bounds to ensure to not write before the framebuffer
int xLoopStart = (xStart >= 0)? xStart : 0;
int xLoopEnd = (xEnd <= RLSW.colorBuffer->width)? xEnd : RLSW.colorBuffer->width;
if (xLoopStart >= xLoopEnd) return; // Nothing to draw
// Compute the subpixel distance to traverse before the first pixel
// Also step further into them to move away from the colorbuffer edge
float xSubstep = 1.0f - sw_fract(start->position[0]);
float dxStart = (float)(xLoopStart - xStart);
float xOffset = xSubstep + dxStart;
// Pre-calculate the starting pointers for the framebuffer row
int baseOffset = y*RLSW.colorBuffer->width + xLoopStart;
uint8_t *cPtr = (uint8_t *)(RLSW.colorBuffer->pixels) + baseOffset*SW_FRAMEBUFFER_COLOR_SIZE;
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
uint8_t *dPtr = (uint8_t *)(RLSW.depthBuffer->pixels) + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
#endif
// Initializing the interpolation starting values
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
float z = start->position[2] + ctx->dZdx*xOffset;
#endif
#if SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE
float w = start->position[3] + ctx->dWdx*xOffset;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
float color[4];
SW_VEC_OP(color[i] = start->color[i] + ctx->dCdx[i]*xOffset, i, 4);
#else
// Flat: constant across the whole triangle, computed once for the whole span
const float *srcColor = ctx->flatColor;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
float texcoord[2];
SW_VEC_OP(texcoord[i] = start->texcoord[i] + ctx->dTdx[i]*xOffset, i, 2);
#endif
#define SW_AFFINE_BLOCK 16
int x = xLoopStart;
while (x < xLoopEnd)
{
#if SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE
// Clamp last block to remaining pixels
int blockEnd = x + SW_AFFINE_BLOCK;
if (blockEnd > xLoopEnd) blockEnd = xLoopEnd;
float blockLenF = (float)(blockEnd - x);
float blockLenRcp = sw_rcp(blockLenF);
// Only 2 '1/w' here; none inside the pixel loop
float wRcpA = sw_rcp(w);
float wB = w + ctx->dWdx*blockLenF;
float wRcpB = sw_rcp(wB);
#else
// Nothing perspective-correct to interpolate: one block covers the whole span
int blockEnd = xLoopEnd;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
// Perspective-correct color at both block endpoints, then affine gradient
float srcColor[4], dSrcColor[4];
SW_VEC_OP(srcColor[i] = color[i]*wRcpA, i, 4);
SW_VEC_OP(dSrcColor[i] = ((color[i] + ctx->dCdx[i]*blockLenF)*wRcpB - srcColor[i])*blockLenRcp, i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
// Perspective-correct UVs at both endpoints, then affine gradient
float tcAffine[2], dTcAffine[2];
SW_VEC_OP(tcAffine[i] = texcoord[i]*wRcpA, i, 2);
SW_VEC_OP(dTcAffine[i] = ((texcoord[i] + ctx->dTdx[i]*blockLenF)*wRcpB - tcAffine[i])*blockLenRcp, i, 2);
#endif
// Inner span pixel loop
for (; x < blockEnd; x++)
{
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
if (z <= depth)
{
SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
float finalColor[4];
ctx->sample(finalColor, RLSW.boundTexture, tcAffine[0], tcAffine[1]);
SW_VEC_OP(finalColor[i] *= srcColor[i], i, 4);
#define SW_FINAL_COLOR finalColor
#else
#define SW_FINAL_COLOR srcColor
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_BLEND
{
float dstColor[4];
SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
RLSW.blendFunc(dstColor, SW_FINAL_COLOR);
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
}
#else
SW_FRAMEBUFFER_COLOR_SET(cPtr, SW_FINAL_COLOR, 0);
#endif
#undef SW_FINAL_COLOR
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
}
#endif
// Advance unconditionally: depth test only guards the write above
cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
dPtr += SW_FRAMEBUFFER_DEPTH_SIZE;
z += ctx->dZdx;
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(srcColor[i] += dSrcColor[i], i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(tcAffine[i] += dTcAffine[i], i, 2);
#endif
}
#if SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE
// Advance perspective-space accumulators by the full block width
w = wB;
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(color[i] += ctx->dCdx[i]*blockLenF, i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(texcoord[i] += ctx->dTdx[i]*blockLenF, i, 2);
#endif
#endif
}
#undef SW_AFFINE_BLOCK
}
static void SW_RASTER_TRIANGLE(const sw_vertex_t *v0, const sw_vertex_t *v1, const sw_vertex_t *v2)
{
// Swap vertices by increasing Y
if (v0->position[1] > v1->position[1]) { const sw_vertex_t *tmp = v0; v0 = v1; v1 = tmp; }
if (v1->position[1] > v2->position[1]) { const sw_vertex_t *tmp = v1; v1 = v2; v2 = tmp; }
if (v0->position[1] > v1->position[1]) { const sw_vertex_t *tmp = v0; v0 = v1; v1 = tmp; }
// Extracting Y coordinates from the sorted vertices
float y0 = v0->position[1];
float y1 = v1->position[1];
float y2 = v2->position[1];
// Compute height differences
float h02 = y2 - y0;
float h01 = y1 - y0;
float h12 = y2 - y1;
if (h02 < 1e-6f) return; // Degenerate (zero screen height): nothing to rasterize
// Inverse edge dy for per-edge dV/dy (scanline interpolation)
float h02Rcp = sw_rcp(h02);
float h01Rcp = (h01 > 1e-6f)? sw_rcp(h01) : 0.0f;
float h12Rcp = (h12 > 1e-6f)? sw_rcp(h12) : 0.0f;
// D = twice the signed screen area; also the shared denominator of the
// barycentric plane solve used below for whole-triangle x/y derivatives
float e1x = v1->position[0] - v0->position[0];
float e2x = v2->position[0] - v0->position[0];
float D = e1x*h02 - e2x*h01;
if (fabsf(D) < 1e-9f) return; // Degenerate (zero screen area): nothing to rasterize
float DRcp = sw_rcp(D);
// Whole-triangle xy-derivatives of an affine attribute (constant for every scanline)
#define SW_DADX(A0, A1, A2) ((((A1)-(A0))*h02 - ((A2)-(A0))*h01)*DRcp)
#define SW_DADY(A0, A1, A2) ((((A2)-(A0))*e1x - ((A1)-(A0))*e2x)*DRcp)
SW_SPAN_CTX ctx;
#if SW_RASTER_TRIANGLE_NEEDS_PERSPECTIVE
ctx.dWdx = SW_DADX(v0->position[3], v1->position[3], v2->position[3]);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_DEPTH_TEST
ctx.dZdx = SW_DADX(v0->position[2], v1->position[2], v2->position[2]);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(ctx.dCdx[i] = SW_DADX(v0->color[i], v1->color[i], v2->color[i]), i, 4);
#else
float flatWRcp = sw_rcp(v0->position[3]);
SW_VEC_OP(ctx.flatColor[i] = v0->color[i]*flatWRcp, i, 4);
#endif
#if (SW_RASTER_TRIANGLE_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(ctx.dTdx[i] = SW_DADX(v0->texcoord[i], v1->texcoord[i], v2->texcoord[i]), i, 2);
SW_VEC_OP(ctx.dTdy[i] = SW_DADY(v0->texcoord[i], v1->texcoord[i], v2->texcoord[i]), i, 2);
ctx.sample = sw_texture_pick_sampler(RLSW.boundTexture, ctx.dTdx, ctx.dTdy);
#endif
#undef SW_DADX
#undef SW_DADY
// Compute gradients for each side of the triangle
sw_vertex_t dVXdy02, dVXdy01, dVXdy12;
SW_GRAD(&dVXdy02, v0, v2, h02Rcp);
SW_GRAD(&dVXdy01, v0, v1, h01Rcp);
SW_GRAD(&dVXdy12, v1, v2, h12Rcp);
// Y subpixel correction
float y0Substep = 1.0f - sw_fract(y0);
float y1Substep = 1.0f - sw_fract(y1);
// Get a copy of vertices for interpolation and apply substep correction
sw_vertex_t lVert = *v0, rVert = *v0;
SW_VMAD(&lVert, &dVXdy02, y0Substep);
SW_VMAD(&rVert, &dVXdy01, y0Substep);
// Y bounds (vertical clipping)
int yTop = (int)y0;
int yMid = (int)y1;
int yBot = (int)y2;
// Scanline for the upper part of the triangle
for (int y = yTop; y < yMid; y++)
{
lVert.position[1] = rVert.position[1] = y;
bool longSideIsLeft = (lVert.position[0] < rVert.position[0]);
const sw_vertex_t *a = longSideIsLeft? &lVert : &rVert;
const sw_vertex_t *b = longSideIsLeft? &rVert : &lVert;
SW_RASTER_TRIANGLE_SPAN(a, b, &ctx);
SW_VADD(&lVert, &dVXdy02);
SW_VADD(&rVert, &dVXdy01);
}
// Get a copy of next right for interpolation and apply substep correction
rVert = *v1;
SW_VMAD(&rVert, &dVXdy12, y1Substep);
// Scanline for the lower part of the triangle
for (int y = yMid; y < yBot; y++)
{
lVert.position[1] = rVert.position[1] = y;
bool longSideIsLeft = (lVert.position[0] < rVert.position[0]);
const sw_vertex_t *a = longSideIsLeft? &lVert : &rVert;
const sw_vertex_t *b = longSideIsLeft? &rVert : &lVert;
SW_RASTER_TRIANGLE_SPAN(a, b, &ctx);
SW_VADD(&lVert, &dVXdy02);
SW_VADD(&rVert, &dVXdy12);
}
}
#endif // SW_RASTER_TRIANGLE_STATES
//-------------------------------------------------------------------------------------------
// Quad rasterization functions
//-------------------------------------------------------------------------------------------
#ifdef SW_RASTER_QUAD_STATES
#define SW_RASTER_QUAD_FLAGS SW_FLAGS(SW_RASTER_QUAD_STATES)
#define SW_RASTER_QUAD SW_CONCATX(sw_raster_quad_, SW_NAME(SW_RASTER_QUAD_STATES))
// NOTE: This function should only render affine axis-aligned quads
// No perspective divide is applied after interpolation
static void SW_RASTER_QUAD(const sw_vertex_t *a, const sw_vertex_t *b,
const sw_vertex_t *c, const sw_vertex_t *d)
{
// Classify corners
// For axis-aligned quads x+y and x-y uniquely identify each corner
const sw_vertex_t *verts[4] = { a, b, c, d };
const sw_vertex_t *tl = verts[0], *tr = verts[0], *br = verts[0], *bl = verts[0];
float tlSum = tl->position[0] + tl->position[1];
float trDiff = tr->position[0] - tr->position[1];
float brSum = br->position[0] + br->position[1];
float blDiff = bl->position[0] - bl->position[1];
for (int i = 1; i < 4; i++)
{
float sum = verts[i]->position[0] + verts[i]->position[1];
float diff = verts[i]->position[0] - verts[i]->position[1];
if (sum < tlSum) { tl = verts[i]; tlSum = sum; }
if (diff > trDiff) { tr = verts[i]; trDiff = diff; }
if (sum > brSum) { br = verts[i]; brSum = sum; }
if (diff < blDiff) { bl = verts[i]; blDiff = diff; }
}
int xMin = (int)tl->position[0];
int yMin = (int)tl->position[1];
int xMax = (int)br->position[0];
int yMax = (int)br->position[1];
// Exit early if no pixels to draw. Use these later for loop boundaries
int yLoopMin = (yMin >= 0)? yMin : 0;
int xLoopMin = (xMin >= 0)? xMin : 0;
int yLoopMax = (yMax <= RLSW.colorBuffer->height)? yMax : RLSW.colorBuffer->height;
int xLoopMax = (xMax <= RLSW.colorBuffer->width)? xMax : RLSW.colorBuffer->width;
if (yLoopMin >= yLoopMax || xLoopMin >= xLoopMax) return;
float w = (float)(xMax - xMin);
float h = (float)(yMax - yMin);
if ((w <= 0) || (h <= 0)) return;
// Per-quad setup, independent of pipeline state
float wRcp = sw_rcp(w);
float hRcp = sw_rcp(h);
float xSubstep = 1.0f - sw_fract(tl->position[0]);
float ySubstep = 1.0f - sw_fract(tl->position[1]);
// Distance the in-bounds boundary is from the quad's edges, only on the left and top
float dxMin = (float)(xLoopMin - xMin);
float dyMin = (float)(yLoopMin - yMin);
int stride = RLSW.colorBuffer->width;
uint8_t *cPixels = RLSW.colorBuffer->pixels;
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
uint8_t *dPixels = RLSW.depthBuffer->pixels;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
// Gradients along X (tl->tr) and Y (tl->bl)
float dZdx = (tr->position[2] - tl->position[2])*wRcp;
float dZdy = (bl->position[2] - tl->position[2])*hRcp;
float zRow = tl->position[2] + dZdx*xSubstep + dZdy*ySubstep;
// Correct start by how far it's clipped outside the framebuffer
zRow += dZdy*dyMin + dZdx*dxMin;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_COLOR_INTERP
float dCdx[4], dCdy[4], cRow[4];
SW_VEC_OP(dCdx[i] = (tr->color[i] - tl->color[i])*wRcp, i, 4);
SW_VEC_OP(dCdy[i] = (bl->color[i] - tl->color[i])*hRcp, i, 4);
SW_VEC_OP(cRow[i] = tl->color[i] + dCdx[i]*xSubstep + dCdy[i]*ySubstep, i, 4);
SW_VEC_OP(cRow[i] += dCdx[i]*dxMin + dCdy[i]*dyMin, i, 4);
#else
const float *flatColor = tl->color;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
float dTdx[2], dTdy[2], tcRow[2];
SW_VEC_OP(dTdx[i] = (tr->texcoord[i] - tl->texcoord[i])*wRcp, i, 2);
SW_VEC_OP(dTdy[i] = (bl->texcoord[i] - tl->texcoord[i])*hRcp, i, 2);
SW_VEC_OP(tcRow[i] = tl->texcoord[i] + dTdx[i]*xSubstep + dTdy[i]*ySubstep, i, 2);
SW_VEC_OP(tcRow[i] += dTdy[i]*dyMin + dTdx[i]*dxMin, i, 2);
// Constant across the whole quad: resolved once, called directly per pixel
sw_texture_sampler_f sample = sw_texture_pick_sampler(RLSW.boundTexture, dTdx, dTdy);
#endif
for (int y = yLoopMin; y < yLoopMax; y++)
{
int baseOffset = y*stride + xLoopMin;
uint8_t *cPtr = cPixels + baseOffset*SW_FRAMEBUFFER_COLOR_SIZE;
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
uint8_t *dPtr = dPixels + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
float z = zRow;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
float tc[2] = { tcRow[0], tcRow[1] };
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_COLOR_INTERP
float color[4] = { cRow[0], cRow[1], cRow[2], cRow[3] };
#endif
for (int x = xLoopMin; x < xLoopMax; x++)
{
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_COLOR_INTERP
#define SW_QUAD_BASE_COLOR color
#else
#define SW_QUAD_BASE_COLOR flatColor
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
// Mutable copy: about to be modulated by the sampled texel below
float srcColor[4];
SW_VEC_OP(srcColor[i] = SW_QUAD_BASE_COLOR[i], i, 4);
#else
// Never mutated past this point: alias directly, no copy needed
const float *srcColor = SW_QUAD_BASE_COLOR;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
if (z <= depth)
{
SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
float texColor[4];
sample(texColor, RLSW.boundTexture, tc[0], tc[1]);
SW_VEC_OP(srcColor[i] *= texColor[i], i, 4);
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_BLEND
float dstColor[4];
SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
RLSW.blendFunc(dstColor, srcColor);
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
#else
SW_FRAMEBUFFER_COLOR_SET(cPtr, srcColor, 0);
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
}
#endif
// Move one pixel over without touching the original "start offset"
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(color[i] += dCdx[i], i, 4);
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
z += dZdx;
dPtr += SW_FRAMEBUFFER_DEPTH_SIZE;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(tc[i] += dTdx[i], i, 2);
#endif
cPtr += SW_FRAMEBUFFER_COLOR_SIZE;
}
// The for loop is clamped to the right side of the screen
// However, these cursor start vars are still on the left
// That's fine, advancing to the next row
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_DEPTH_TEST
zRow += dZdy;
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(cRow[i] += dCdy[i], i, 4);
#endif
#if (SW_RASTER_QUAD_FLAGS) & SW_STATE_TEXTURE_2D
SW_VEC_OP(tcRow[i] += dTdy[i], i, 2);
#endif
}
#undef SW_QUAD_BASE_COLOR
}
#endif // SW_RASTER_QUAD_STATES
//-------------------------------------------------------------------------------------------
// Line rasterization functions
//-------------------------------------------------------------------------------------------
#ifdef SW_RASTER_LINE_STATES
#define SW_RASTER_LINE_FLAGS SW_FLAGS(SW_RASTER_LINE_STATES)
#define SW_RASTER_LINE_THIN SW_CONCATX(sw_raster_line_thin_, SW_NAME(SW_RASTER_LINE_STATES))
#define SW_RASTER_LINE SW_CONCATX(sw_raster_line_, SW_NAME(SW_RASTER_LINE_STATES))
// Renders a single-pixel-wide line; internal building block for SW_RASTER_LINE
static void SW_RASTER_LINE_THIN(const sw_vertex_t *v0, const sw_vertex_t *v1)
{
// Convert from pixel-center convention (n+0.5) to pixel-origin convention (n)
float x0 = v0->position[0] - 0.5f;
float y0 = v0->position[1] - 0.5f;
float x1 = v1->position[0] - 0.5f;
float y1 = v1->position[1] - 0.5f;
float dx = x1 - x0;
float dy = y1 - y0;
// Compute dominant axis and subpixel offset
float steps, substep;
if (fabsf(dx) > fabsf(dy))
{
steps = fabsf(dx);
if (steps < 1.0f) return;
substep = (dx >= 0.0f)? (1.0f - sw_fract(x0)) : sw_fract(x0);
}
else
{
steps = fabsf(dy);
if (steps < 1.0f) return;
substep = (dy >= 0.0f)? (1.0f - sw_fract(y0)) : sw_fract(y0);
}
// Line setup, independent of pipeline state
float stepRcp = sw_rcp(steps);
float xInc = dx*stepRcp;
float yInc = dy*stepRcp;
int numPixels = (int)(steps - substep) + 1;
const int fbWidth = RLSW.colorBuffer->width;
uint8_t *cPixels = RLSW.colorBuffer->pixels;
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
uint8_t *dPixels = RLSW.depthBuffer->pixels;
#endif
// Initializing the interpolation starting values
float x = x0 + xInc*substep;
float y = y0 + yInc*substep;
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
float zInc = (v1->position[2] - v0->position[2])*stepRcp;
float z = v0->position[2] + zInc*substep;
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_COLOR_INTERP
float cInc[4], color[4];
SW_VEC_OP(cInc[i] = (v1->color[i] - v0->color[i])*stepRcp, i, 4);
SW_VEC_OP(color[i] = v0->color[i] + cInc[i]*substep, i, 4);
#else
// Flat: constant across the whole line, computed once for the whole loop
const float *srcColor = v0->color;
#endif
for (int i = 0; i < numPixels; i++)
{
int px = x;
int py = y;
int baseOffset = py*fbWidth + px;
uint8_t *cPtr = cPixels + baseOffset*SW_FRAMEBUFFER_COLOR_SIZE;
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
uint8_t *dPtr = dPixels + baseOffset*SW_FRAMEBUFFER_DEPTH_SIZE;
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
// TODO: Implement different depth funcs?
float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
if (z <= depth)
{
// TODO: Implement depth mask
SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_COLOR_INTERP
const float *srcColor = color;
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_BLEND
float dstColor[4];
SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
RLSW.blendFunc(dstColor, srcColor);
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
#else
SW_FRAMEBUFFER_COLOR_SET(cPtr, srcColor, 0);
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
}
#endif
// Advance unconditionally: depth test only guards the write above
x += xInc;
y += yInc;
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_DEPTH_TEST
z += zInc;
#endif
#if (SW_RASTER_LINE_FLAGS) & SW_STATE_COLOR_INTERP
SW_VEC_OP(color[i] += cInc[i], i, 4);
#endif
}
}
static void SW_RASTER_LINE(const sw_vertex_t *v0, const sw_vertex_t *v1)
{
if (RLSW.lineWidth < 2.0f)
{
SW_RASTER_LINE_THIN(v0, v1);
return;
}
sw_vertex_t tv0, tv1;
int x0 = (int)v0->position[0];
int y0 = (int)v0->position[1];
int x1 = (int)v1->position[0];
int y1 = (int)v1->position[1];
int dx = x1 - x0;
int dy = y1 - y0;
SW_RASTER_LINE_THIN(v0, v1);
if ((dx != 0) && (abs(dy/dx) < 1))
{
int wy = (int)((RLSW.lineWidth - 1.0f)*abs(dx)/sqrtf(dx*dx + dy*dy));
wy >>= 1;
for (int i = 1; i <= wy; i++)
{
tv0 = *v0, tv1 = *v1;
tv0.position[1] -= i;
tv1.position[1] -= i;
SW_RASTER_LINE_THIN(&tv0, &tv1);
tv0 = *v0, tv1 = *v1;
tv0.position[1] += i;
tv1.position[1] += i;
SW_RASTER_LINE_THIN(&tv0, &tv1);
}
}
else if (dy != 0)
{
int wx = (int)((RLSW.lineWidth - 1.0f)*abs(dy)/sqrtf(dx*dx + dy*dy));
wx >>= 1;
for (int i = 1; i <= wx; i++)
{
tv0 = *v0, tv1 = *v1;
tv0.position[0] -= i;
tv1.position[0] -= i;
SW_RASTER_LINE_THIN(&tv0, &tv1);
tv0 = *v0, tv1 = *v1;
tv0.position[0] += i;
tv1.position[0] += i;
SW_RASTER_LINE_THIN(&tv0, &tv1);
}
}
}
#endif // SW_RASTER_LINE_STATES
//-------------------------------------------------------------------------------------------
// Point rasterization functions
//-------------------------------------------------------------------------------------------
#ifdef SW_RASTER_POINT_STATES
#define SW_RASTER_POINT_FLAGS SW_FLAGS(SW_RASTER_POINT_STATES)
#define SW_RASTER_POINT_PIXEL SW_CONCATX(sw_raster_point_pixel_, SW_NAME(SW_RASTER_POINT_STATES))
#define SW_RASTER_POINT SW_CONCATX(sw_raster_point_, SW_NAME(SW_RASTER_POINT_STATES))
static void SW_RASTER_POINT_PIXEL(int x, int y, float z, const float color[4])
{
int offset = y*RLSW.colorBuffer->width + x;
#if (SW_RASTER_POINT_FLAGS) & SW_STATE_DEPTH_TEST
{
uint8_t *dPtr = (uint8_t *)(RLSW.depthBuffer->pixels) + offset*SW_FRAMEBUFFER_DEPTH_SIZE;
// TODO: Implement different depth funcs?
float depth = SW_FRAMEBUFFER_DEPTH_GET(dPtr, 0);
if (z > depth) return;
// TODO: Implement depth mask
SW_FRAMEBUFFER_DEPTH_SET(dPtr, z, 0);
}
#endif
uint8_t *cPtr = (uint8_t *)(RLSW.colorBuffer->pixels) + offset*SW_FRAMEBUFFER_COLOR_SIZE;
#if (SW_RASTER_POINT_FLAGS) & SW_STATE_BLEND
{
float dstColor[4];
SW_FRAMEBUFFER_COLOR_GET(dstColor, cPtr, 0);
RLSW.blendFunc(dstColor, color);
SW_FRAMEBUFFER_COLOR_SET(cPtr, dstColor, 0);
}
#else
{
SW_FRAMEBUFFER_COLOR_SET(cPtr, color, 0);
}
#endif
}
static void SW_RASTER_POINT(const sw_vertex_t *v)
{
int cx = v->position[0];
int cy = v->position[1];
float cz = v->position[2];
int radius = RLSW.pointRadius;
const float *color = v->color;
for (int dy = -radius; dy <= radius; dy++)
{
for (int dx = -radius; dx <= radius; dx++)
{
SW_RASTER_POINT_PIXEL(cx + dx, cy + dy, cz, color);
}
}
}
#endif // SW_RASTER_POINT_STATES
//-------------------------------------------------------------------------------------------