h-raylib-5.6.0.0: raylib/src/external/rlsw.h
/**********************************************************************************************
*
* rlsw v1.0 - 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 just defining some internal
* values before library inclusion (default values listed):
*
* #define SW_GL_FRAMEBUFFER_COPY_BGRA true
* #define SW_GL_BINDING_COPY_TEXTURE true
* #define SW_COLOR_BUFFER_BITS 24
* #define SW_DEPTH_BUFFER_BITS 16
* #define SW_MAX_PROJECTION_STACK_SIZE 2
* #define SW_MAX_MODELVIEW_STACK_SIZE 8
* #define SW_MAX_TEXTURE_STACK_SIZE 2
* #define SW_MAX_TEXTURES 128
*
*
* 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
#include <stdbool.h>
#include <stdint.h>
//----------------------------------------------------------------------------------
// 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_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
#ifndef SW_GL_FRAMEBUFFER_COPY_BGRA
#define SW_GL_FRAMEBUFFER_COPY_BGRA true
#endif
#ifndef SW_COLOR_BUFFER_BITS
#define SW_COLOR_BUFFER_BITS 32 //< 32 (rgba), 16 (rgb packed) or 8 (rgb packed)
#endif
#ifndef SW_DEPTH_BUFFER_BITS
#define SW_DEPTH_BUFFER_BITS 16 //< 32, 24 or 16
#endif
#ifndef SW_MAX_PROJECTION_STACK_SIZE
#define SW_MAX_PROJECTION_STACK_SIZE 2
#endif
#ifndef SW_MAX_MODELVIEW_STACK_SIZE
#define SW_MAX_MODELVIEW_STACK_SIZE 8
#endif
#ifndef SW_MAX_TEXTURE_STACK_SIZE
#define SW_MAX_TEXTURE_STACK_SIZE 2
#endif
#ifndef SW_MAX_TEXTURES
#define SW_MAX_TEXTURES 128
#endif
// Under normal circumstances, clipping a polygon can add at most one vertex per clipping plane
// Considering the largest polygon involved is a quadrilateral (4 vertices),
// and that clipping occurs against both the frustum (6 planes) and the scissors (4 planes),
// the maximum number of vertices after clipping is:
// 4 (original vertices) + 6 (frustum planes) + 4 (scissors planes) = 14
#ifndef SW_MAX_CLIPPED_POLYGON_VERTICES
#define SW_MAX_CLIPPED_POLYGON_VERTICES 14
#endif
#ifndef SW_CLIP_EPSILON
#define SW_CLIP_EPSILON 1e-4f
#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_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_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
// 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
//----------------------------------------------------------------------------------
// OpenGL Bindings to rlsw
//----------------------------------------------------------------------------------
#define glReadPixels(x, y, w, h, f, t, p) swCopyFramebuffer((x), (y), (w), (h), (f), (t), (p))
#define glEnable(state) swEnable((state))
#define glDisable(state) swDisable((state))
#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 glTexImage2D(tr, l, if, w, h, b, f, t, p) swTexImage2D((w), (h), (f), (t), (p))
#define glTexParameteri(tr, pname, param) swTexParameteri((pname), (param))
#define glBindTexture(tr, id) swBindTexture((id))
// 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 glTexSubImage2D(X,Y,Z,W,A,B,C,D,E) ((void)(X),(void)(Y),(void)(Z),(void)(W),(void)(A),(void)(B),(void)(C),(void)(D),(void)(E))
#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_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
} 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_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,
} SWformat;
typedef enum {
SW_UNSIGNED_BYTE = GL_UNSIGNED_BYTE,
SW_BYTE = GL_BYTE,
SW_UNSIGNED_SHORT = GL_UNSIGNED_SHORT,
SW_SHORT = GL_SHORT,
SW_UNSIGNED_INT = GL_UNSIGNED_INT,
SW_INT = GL_INT,
SW_FLOAT = GL_FLOAT
} SWtype;
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_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,
} SWerrcode;
//------------------------------------------------------------------------------------
// Functions Declaration - Public API
//------------------------------------------------------------------------------------
SWAPI bool swInit(int w, int h);
SWAPI void swClose(void);
SWAPI bool swResizeFramebuffer(int w, int h);
SWAPI void swCopyFramebuffer(int x, int y, int w, int h, SWformat format, SWtype type, void *pixels);
SWAPI void swBlitFramebuffer(int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, SWformat format, SWtype type, void *pixels);
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 swTexImage2D(int width, int height, SWformat format, SWtype type, const void *data);
SWAPI void swTexParameteri(int param, int value);
SWAPI void swBindTexture(uint32_t id);
#endif // RLSW_H
/***********************************************************************************
*
* RLSW IMPLEMENTATION
*
************************************************************************************/
#define RLSW_IMPLEMENTATION
#if defined(RLSW_IMPLEMENTATION)
#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 SW_SUPPORT_LOG_INFO
#if defined(SW_SUPPORT_LOG_INFO) //&& defined(_DEBUG) // WARNING: LOG() output required for this tool
#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(_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 defined(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 // RLSW_USE_SIMD_INTRINSICS
#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)
#define SW_COLOR_PIXEL_SIZE (SW_COLOR_BUFFER_BITS >> 3)
#define SW_DEPTH_PIXEL_SIZE (SW_DEPTH_BUFFER_BITS >> 3)
#define SW_PIXEL_SIZE (SW_COLOR_PIXEL_SIZE + SW_DEPTH_PIXEL_SIZE)
#if (SW_PIXEL_SIZE <= 4)
#define SW_PIXEL_ALIGNMENT 4
#else // if (SW_PIXEL_SIZE <= 8)
#define SW_PIXEL_ALIGNMENT 8
#endif
#if (SW_COLOR_BUFFER_BITS == 8)
#define SW_COLOR_TYPE uint8_t
#define SW_COLOR_IS_PACKED 1
#define SW_COLOR_PACK_COMP 1
#define SW_PACK_COLOR(r,g,b) ((((uint8_t)((r)*7+0.5f))&0x07)<<5 | (((uint8_t)((g)*7+0.5f))&0x07)<<2 | ((uint8_t)((b)*3+0.5f))&0x03)
#define SW_UNPACK_R(p) (((p)>>5)&0x07)
#define SW_UNPACK_G(p) (((p)>>2)&0x07)
#define SW_UNPACK_B(p) ((p)&0x03)
#define SW_SCALE_R(v) ((v)*255+3)/7
#define SW_SCALE_G(v) ((v)*255+3)/7
#define SW_SCALE_B(v) ((v)*255+1)/3
#define SW_TO_FLOAT_R(v) ((v)*(1.0f/7.0f))
#define SW_TO_FLOAT_G(v) ((v)*(1.0f/7.0f))
#define SW_TO_FLOAT_B(v) ((v)*(1.0f/3.0f))
#elif (SW_COLOR_BUFFER_BITS == 16)
#define SW_COLOR_TYPE uint16_t
#define SW_COLOR_IS_PACKED 1
#define SW_COLOR_PACK_COMP 1
#define SW_PACK_COLOR(r,g,b) ((((uint16_t)((r)*31+0.5f))&0x1F)<<11 | (((uint16_t)((g)*63+0.5f))&0x3F)<<5 | ((uint16_t)((b)*31+0.5f))&0x1F)
#define SW_UNPACK_R(p) (((p)>>11)&0x1F)
#define SW_UNPACK_G(p) (((p)>>5)&0x3F)
#define SW_UNPACK_B(p) ((p)&0x1F)
#define SW_SCALE_R(v) ((v)*255+15)/31
#define SW_SCALE_G(v) ((v)*255+31)/63
#define SW_SCALE_B(v) ((v)*255+15)/31
#define SW_TO_FLOAT_R(v) ((v)*(1.0f/31.0f))
#define SW_TO_FLOAT_G(v) ((v)*(1.0f/63.0f))
#define SW_TO_FLOAT_B(v) ((v)*(1.0f/31.0f))
#else // 32 bits
#define SW_COLOR_TYPE uint8_t
#define SW_COLOR_IS_PACKED 0
#define SW_COLOR_PACK_COMP 4
#endif
#if (SW_DEPTH_BUFFER_BITS == 16)
#define SW_DEPTH_TYPE uint16_t
#define SW_DEPTH_IS_PACKED 1
#define SW_DEPTH_PACK_COMP 1
#define SW_DEPTH_MAX UINT16_MAX
#define SW_DEPTH_SCALE (1.0f/UINT16_MAX)
#define SW_PACK_DEPTH(d) ((SW_DEPTH_TYPE)((d)*SW_DEPTH_MAX))
#define SW_UNPACK_DEPTH(p) (p)
#elif (SW_DEPTH_BUFFER_BITS == 24)
#define SW_DEPTH_TYPE uint8_t
#define SW_DEPTH_IS_PACKED 0
#define SW_DEPTH_PACK_COMP 3
#define SW_DEPTH_MAX 0xFFFFFFU
#define SW_DEPTH_SCALE (1.0f/0xFFFFFFU)
#define SW_PACK_DEPTH_0(d) ((uint8_t)(((uint32_t)((d)*SW_DEPTH_MAX)>>16)&0xFFU))
#define SW_PACK_DEPTH_1(d) ((uint8_t)(((uint32_t)((d)*SW_DEPTH_MAX)>>8)&0xFFU))
#define SW_PACK_DEPTH_2(d) ((uint8_t)((uint32_t)((d)*SW_DEPTH_MAX)&0xFFU))
#define SW_UNPACK_DEPTH(p) ((((uint32_t)(p)[0]<<16)|((uint32_t)(p)[1]<<8)|(uint32_t)(p)[2]))
#else // 32 bits
#define SW_DEPTH_TYPE float
#define SW_DEPTH_IS_PACKED 1
#define SW_DEPTH_PACK_COMP 1
#define SW_DEPTH_MAX 1.0f
#define SW_DEPTH_SCALE 1.0f
#define SW_PACK_DEPTH(d) ((SW_DEPTH_TYPE)(d))
#define SW_UNPACK_DEPTH(p) (p)
#endif
#define SW_STATE_CHECK(flags) (SW_STATE_CHECK_EX(RLSW.stateFlags, (flags)))
#define SW_STATE_CHECK_EX(state, flags) (((state) & (flags)) == (flags))
#define SW_STATE_SCISSOR_TEST (1 << 0)
#define SW_STATE_TEXTURE_2D (1 << 1)
#define SW_STATE_DEPTH_TEST (1 << 2)
#define SW_STATE_CULL_FACE (1 << 3)
#define SW_STATE_BLEND (1 << 4)
//----------------------------------------------------------------------------------
// Module Types and Structures Definition
//----------------------------------------------------------------------------------
// Pixel data format type
// NOTE: Enum aligned with raylib PixelFormat
typedef enum {
SW_PIXELFORMAT_UNKNOWN = 0,
SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE, // 8 bit per pixel (no alpha)
SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA, // 8*2 bpp (2 channels)
SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5, // 16 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8, // 24 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1, // 16 bpp (1 bit alpha)
SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4, // 16 bpp (4 bit alpha)
SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8, // 32 bpp
SW_PIXELFORMAT_UNCOMPRESSED_R32, // 32 bpp (1 channel - float)
SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32, // 32*3 bpp (3 channels - float)
SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32, // 32*4 bpp (4 channels - float)
SW_PIXELFORMAT_UNCOMPRESSED_R16, // 16 bpp (1 channel - half float)
SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16, // 16*3 bpp (3 channels - half float)
SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16, // 16*4 bpp (4 channels - half float)
} sw_pixelformat_t;
typedef void (*sw_factor_f)(
float *SW_RESTRICT factor,
const float *SW_RESTRICT src,
const float *SW_RESTRICT dst
);
typedef float sw_matrix_t[4*4];
typedef uint16_t sw_half_t;
typedef struct {
float position[4]; // Position coordinates
float texcoord[2]; // Texture coordinates
float color[4]; // Color value (RGBA)
float homogeneous[4]; // Homogeneous coordinates
float screen[2]; // Screen coordinates
} sw_vertex_t;
typedef struct {
uint8_t *pixels; // Texture pixels (RGBA32)
int width, height; // Dimensions of the texture
int wMinus1, hMinus1; // Dimensions minus one
SWfilter minFilter; // Minification filter
SWfilter magFilter; // Magnification filter
SWwrap sWrap; // texcoord.x wrap mode
SWwrap tWrap; // texcoord.y wrap mode
float tx; // Texel width
float ty; // Texel height
} sw_texture_t;
// Pixel data type
typedef SW_ALIGN(SW_PIXEL_ALIGNMENT) struct {
SW_COLOR_TYPE color[SW_COLOR_PACK_COMP];
SW_DEPTH_TYPE depth[SW_DEPTH_PACK_COMP];
#if (SW_PIXEL_SIZE % SW_PIXEL_ALIGNMENT != 0)
uint8_t padding[SW_PIXEL_ALIGNMENT - SW_PIXEL_SIZE % SW_PIXEL_ALIGNMENT];
#endif
} sw_pixel_t;
typedef struct {
sw_pixel_t *pixels;
int width;
int height;
int allocSz;
} sw_framebuffer_t;
typedef struct {
sw_framebuffer_t framebuffer; // Main framebuffer
sw_pixel_t clearValue; // Clear value of the framebuffer
float vpCenter[2]; // Viewport center
float vpHalf[2]; // Viewport half dimensions
int vpSize[2]; // Viewport dimensions (minus one)
int vpMin[2]; // Viewport minimum renderable point (top-left)
int vpMax[2]; // Viewport maximum renderable point (bottom-right)
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
uint32_t currentTexture; // Current active texture id
struct {
float *positions;
float *texcoords;
uint8_t *colors;
} array;
struct {
float texcoord[2];
float color[4];
} current;
sw_vertex_t vertexBuffer[SW_MAX_CLIPPED_POLYGON_VERTICES]; // Buffer used for storing primitive vertices, used for processing and rendering
int vertexCounter; // Number of vertices in 'ctx.vertexBuffer'
SWdraw drawMode; // Current primitive mode (e.g., lines, triangles)
SWpoly polyMode; // Current polygon filling mode (e.g., lines, triangles)
int reqVertices; // Number of vertices required for the primitive being drawn
float pointRadius; // Rasterized point radius
float lineWidth; // Rasterized line width
sw_matrix_t stackProjection[SW_MAX_PROJECTION_STACK_SIZE]; // Projection matrix stack for push/pop operations
sw_matrix_t stackModelview[SW_MAX_MODELVIEW_STACK_SIZE]; // Modelview matrix stack for push/pop operations
sw_matrix_t stackTexture[SW_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
bool isDirtyMVP; // Indicates if the MVP matrix should be rebuilt
SWfactor srcFactor;
SWfactor dstFactor;
sw_factor_f srcFactorFunc;
sw_factor_f dstFactorFunc;
SWface cullFace; // Faces to cull
SWerrcode errCode; // Last error code
sw_texture_t *loadedTextures;
int loadedTextureCount;
uint32_t *freeTextureIds;
int freeTextureIdCount;
uint32_t stateFlags;
} sw_context_t;
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
static sw_context_t RLSW = { 0 };
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
static 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 inline void sw_matrix_mul_rst(float *SW_RESTRICT dst, const float *SW_RESTRICT left, const float *SW_RESTRICT right)
{
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];
}
static 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 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 inline float sw_fract(float x)
{
return (x - floorf(x));
}
static inline int sw_clampi(int v, int min, int max)
{
if (v < min) return min;
if (v > max) return max;
return v;
}
static inline void sw_lerp_vertex_PTCH(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;
// 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;
// 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;
// Homogeneous coordinate interpolation (4 components)
out->homogeneous[0] = a->homogeneous[0]*tInv + b->homogeneous[0]*t;
out->homogeneous[1] = a->homogeneous[1]*tInv + b->homogeneous[1]*t;
out->homogeneous[2] = a->homogeneous[2]*tInv + b->homogeneous[2]*t;
out->homogeneous[3] = a->homogeneous[3]*tInv + b->homogeneous[3]*t;
}
static inline void sw_get_vertex_grad_PTCH(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT a, const sw_vertex_t *SW_RESTRICT b, float scale)
{
// Calculate gradients for Position
out->position[0] = (b->position[0] - a->position[0])*scale;
out->position[1] = (b->position[1] - a->position[1])*scale;
out->position[2] = (b->position[2] - a->position[2])*scale;
out->position[3] = (b->position[3] - a->position[3])*scale;
// Calculate gradients for Texture coordinates
out->texcoord[0] = (b->texcoord[0] - a->texcoord[0])*scale;
out->texcoord[1] = (b->texcoord[1] - a->texcoord[1])*scale;
// Calculate gradients for Color
out->color[0] = (b->color[0] - a->color[0])*scale;
out->color[1] = (b->color[1] - a->color[1])*scale;
out->color[2] = (b->color[2] - a->color[2])*scale;
out->color[3] = (b->color[3] - a->color[3])*scale;
// Calculate gradients for Homogeneous coordinates
out->homogeneous[0] = (b->homogeneous[0] - a->homogeneous[0])*scale;
out->homogeneous[1] = (b->homogeneous[1] - a->homogeneous[1])*scale;
out->homogeneous[2] = (b->homogeneous[2] - a->homogeneous[2])*scale;
out->homogeneous[3] = (b->homogeneous[3] - a->homogeneous[3])*scale;
}
static inline void sw_add_vertex_grad_PTCH(sw_vertex_t *SW_RESTRICT out, const sw_vertex_t *SW_RESTRICT gradients)
{
// Add gradients to Position
out->position[0] += gradients->position[0];
out->position[1] += gradients->position[1];
out->position[2] += gradients->position[2];
out->position[3] += gradients->position[3];
// Add gradients to Texture coordinates
out->texcoord[0] += gradients->texcoord[0];
out->texcoord[1] += gradients->texcoord[1];
// Add gradients to Color
out->color[0] += gradients->color[0];
out->color[1] += gradients->color[1];
out->color[2] += gradients->color[2];
out->color[3] += gradients->color[3];
// Add gradients to Homogeneous coordinates
out->homogeneous[0] += gradients->homogeneous[0];
out->homogeneous[1] += gradients->homogeneous[1];
out->homogeneous[2] += gradients->homogeneous[2];
out->homogeneous[3] += gradients->homogeneous[3];
}
static inline void sw_add_vertex_grad_scaled_PTCH(
sw_vertex_t *SW_RESTRICT out,
const sw_vertex_t *SW_RESTRICT gradients,
float scale)
{
// Add gradients to Position
out->position[0] += gradients->position[0]*scale;
out->position[1] += gradients->position[1]*scale;
out->position[2] += gradients->position[2]*scale;
out->position[3] += gradients->position[3]*scale;
// Add gradients to Texture coordinates
out->texcoord[0] += gradients->texcoord[0]*scale;
out->texcoord[1] += gradients->texcoord[1]*scale;
// Add gradients to Color
out->color[0] += gradients->color[0]*scale;
out->color[1] += gradients->color[1]*scale;
out->color[2] += gradients->color[2]*scale;
out->color[3] += gradients->color[3]*scale;
// Add gradients to Homogeneous coordinates
out->homogeneous[0] += gradients->homogeneous[0]*scale;
out->homogeneous[1] += gradients->homogeneous[1]*scale;
out->homogeneous[2] += gradients->homogeneous[2]*scale;
out->homogeneous[3] += gradients->homogeneous[3]*scale;
}
static inline void sw_float_to_unorm8_simd(uint8_t dst[4], const float src[4])
{
#if defined(SW_HAS_NEON)
float32x4_t values = vld1q_f32(src);
float32x4_t scaled = vmulq_n_f32(values, 255.0f);
int32x4_t clamped_s32 = vcvtq_s32_f32(scaled); // f32 -> s32 (truncated)
int16x4_t narrow16_s = vqmovn_s32(clamped_s32);
int16x8_t combined16_s = vcombine_s16(narrow16_s, narrow16_s);
uint8x8_t narrow8_u = vqmovun_s16(combined16_s);
vst1_lane_u32((uint32_t*)dst, vreinterpret_u32_u8(narrow8_u), 0);
#elif defined(SW_HAS_SSE41)
__m128 values = _mm_loadu_ps(src);
__m128 scaled = _mm_mul_ps(values, _mm_set1_ps(255.0f));
__m128i clamped = _mm_cvtps_epi32(scaled); // f32 -> s32 (truncated)
clamped = _mm_packus_epi32(clamped, clamped); // s32 -> u16 (saturated < 0 to 0)
clamped = _mm_packus_epi16(clamped, clamped); // u16 -> u8 (saturated > 255 to 255)
*(uint32_t*)dst = _mm_cvtsi128_si32(clamped);
#elif defined(SW_HAS_SSE2)
__m128 values = _mm_loadu_ps(src);
__m128 scaled = _mm_mul_ps(values, _mm_set1_ps(255.0f));
__m128i clamped = _mm_cvtps_epi32(scaled); // f32 -> s32 (truncated)
clamped = _mm_packs_epi32(clamped, clamped); // s32 -> s16 (saturated)
clamped = _mm_packus_epi16(clamped, clamped); // s16 -> u8 (saturated < 0 to 0)
*(uint32_t*)dst = _mm_cvtsi128_si32(clamped);
#elif defined(SW_HAS_RVV)
// TODO: Sample code generated by AI, needs testing and review
// 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
// Clamp to [0.0f, 1.0f]
vfloat32m1_t vzero = __riscv_vfmv_v_f_f32m1(0.0f, vl);
vfloat32m1_t vone = __riscv_vfmv_v_f_f32m1(1.0f, vl);
vsrc = __riscv_vfmin_vv_f32m1(vsrc, vone, vl);
vsrc = __riscv_vfmax_vv_f32m1(vsrc, vzero, vl);
// 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
for (int i = 0; i < 4; i++)
{
float val = src[i]*255.0f;
val = (val > 255.0f)? 255.0f : val;
val = (val < 0.0f)? 0.0f : val;
dst[i] = (uint8_t)val;
}
#endif
}
static inline void sw_float_from_unorm8_simd(float dst[4], const uint8_t src[4])
{
#if defined(SW_HAS_NEON)
uint8x8_t bytes8 = vld1_u8(src); //< Read 8 bytes, faster, but let's hope we're not at the end of the page (unlikely)...
uint16x8_t bytes16 = vmovl_u8(bytes8);
uint32x4_t ints = vmovl_u16(vget_low_u16(bytes16));
float32x4_t floats = vcvtq_f32_u32(ints);
floats = vmulq_n_f32(floats, SW_INV_255);
vst1q_f32(dst, floats);
#elif defined(SW_HAS_SSE41)
__m128i bytes = _mm_cvtsi32_si128(*(const uint32_t *)src);
__m128i ints = _mm_cvtepu8_epi32(bytes);
__m128 floats = _mm_cvtepi32_ps(ints);
floats = _mm_mul_ps(floats, _mm_set1_ps(SW_INV_255));
_mm_storeu_ps(dst, floats);
#elif defined(SW_HAS_SSE2)
__m128i bytes = _mm_cvtsi32_si128(*(const uint32_t *)src);
bytes = _mm_unpacklo_epi8(bytes, _mm_setzero_si128());
__m128i ints = _mm_unpacklo_epi16(bytes, _mm_setzero_si128());
__m128 floats = _mm_cvtepi32_ps(ints);
floats = _mm_mul_ps(floats, _mm_set1_ps(SW_INV_255));
_mm_storeu_ps(dst, floats);
#elif defined(SW_HAS_RVV)
// TODO: 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
#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
}
// Half conversion functions
static inline uint32_t sw_half_to_float_ui(uint16_t h)
{
uint32_t s = (uint32_t)(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 we preserve NaN payload as a byproduct of unifying inf/nan cases
// 112 is an exponent bias fixup; since we already applied it once, applying it twice converts 31 to 255
r += (em >= (31 << 10))? (112 << 23) : 0;
return s | r;
}
static inline float sw_half_to_float(sw_half_t y)
{
union { float f; uint32_t i; } v = { .i = sw_half_to_float_ui(y) };
return v.f;
}
static inline uint16_t sw_half_from_float_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 we convert all types of NaN to qNaN
h = (em > (255 << 23))? 0x7e00 : h;
return (uint16_t)(s | h);
}
static inline sw_half_t sw_half_from_float(float i)
{
union { float f; uint32_t i; } v;
v.f = i;
return sw_half_from_float_ui(v.i);
}
// Framebuffer management functions
//-------------------------------------------------------------------------------------------
static inline bool sw_framebuffer_load(int w, int h)
{
int size = w*h;
RLSW.framebuffer.pixels = SW_MALLOC(sizeof(sw_pixel_t)*size);
if (RLSW.framebuffer.pixels == NULL) return false;
RLSW.framebuffer.width = w;
RLSW.framebuffer.height = h;
RLSW.framebuffer.allocSz = size;
return true;
}
static inline bool sw_framebuffer_resize(int w, int h)
{
int newSize = w*h;
if (newSize <= RLSW.framebuffer.allocSz)
{
RLSW.framebuffer.width = w;
RLSW.framebuffer.height = h;
return true;
}
void *newPixels = SW_REALLOC(RLSW.framebuffer.pixels, sizeof(sw_pixel_t)*newSize);
if (newPixels == NULL) return false;
RLSW.framebuffer.pixels = newPixels;
RLSW.framebuffer.width = w;
RLSW.framebuffer.height = h;
RLSW.framebuffer.allocSz = newSize;
return true;
}
static inline void sw_framebuffer_read_color(float dst[4], const sw_pixel_t *src)
{
#if SW_COLOR_IS_PACKED
SW_COLOR_TYPE pixel = src->color[0];
dst[0] = SW_TO_FLOAT_R(SW_UNPACK_R(pixel));
dst[1] = SW_TO_FLOAT_G(SW_UNPACK_G(pixel));
dst[2] = SW_TO_FLOAT_B(SW_UNPACK_B(pixel));
dst[3] = 1.0f;
#else
sw_float_from_unorm8_simd(dst, src->color);
#endif
}
static inline void sw_framebuffer_read_color8(uint8_t dst[4], const sw_pixel_t *src)
{
#if SW_COLOR_IS_PACKED
SW_COLOR_TYPE pixel = src->color[0];
dst[0] = SW_SCALE_R(SW_UNPACK_R(pixel));
dst[1] = SW_SCALE_G(SW_UNPACK_G(pixel));
dst[2] = SW_SCALE_B(SW_UNPACK_B(pixel));
dst[3] = 255;
#else
const SW_COLOR_TYPE *p = src->color;
dst[0] = p[0];
dst[1] = p[1];
dst[2] = p[2];
dst[3] = p[3];
#endif
}
static inline float sw_framebuffer_read_depth(const sw_pixel_t *src)
{
#if SW_DEPTH_IS_PACKED
return src->depth[0]*SW_DEPTH_SCALE;
#else
return SW_UNPACK_DEPTH(src->depth)*SW_DEPTH_SCALE;
#endif
}
static inline void sw_framebuffer_write_color(sw_pixel_t *dst, const float src[4])
{
#if SW_COLOR_IS_PACKED
dst->color[0] = SW_PACK_COLOR(src[0], src[1], src[2]);
#else
sw_float_to_unorm8_simd(dst->color, src);
#endif
}
static inline void sw_framebuffer_write_depth(sw_pixel_t *dst, float depth)
{
depth = sw_saturate(depth); // REVIEW: An overflow can occur in certain circumstances with clipping, and needs to be reviewed...
#if SW_DEPTH_IS_PACKED
dst->depth[0] = SW_PACK_DEPTH(depth);
#else
dst->depth[0] = SW_PACK_DEPTH_0(depth);
dst->depth[1] = SW_PACK_DEPTH_1(depth);
dst->depth[2] = SW_PACK_DEPTH_2(depth);
#endif
}
static inline void sw_framebuffer_fill_color(sw_pixel_t *ptr, int size, const SW_COLOR_TYPE color[SW_COLOR_PACK_COMP])
{
if (RLSW.stateFlags & SW_STATE_SCISSOR_TEST)
{
int w = RLSW.scMax[0] - RLSW.scMin[0] + 1;
for (int y = RLSW.scMin[1]; y <= RLSW.scMax[1]; y++)
{
sw_pixel_t *row = ptr + y*RLSW.framebuffer.width + RLSW.scMin[0];
for (int x = 0; x < w; x++, row++)
{
for (int i = 0; i < SW_COLOR_PACK_COMP; i++) row->color[i] = color[i];
}
}
}
else
{
for (int i = 0; i < size; i++, ptr++)
{
for (int j = 0; j < SW_COLOR_PACK_COMP; j++) ptr->color[j] = color[j];
}
}
}
static inline void sw_framebuffer_fill_depth(sw_pixel_t *ptr, int size, const SW_DEPTH_TYPE depth[SW_DEPTH_PACK_COMP])
{
if (RLSW.stateFlags & SW_STATE_SCISSOR_TEST)
{
int w = RLSW.scMax[0] - RLSW.scMin[0] + 1;
for (int y = RLSW.scMin[1]; y <= RLSW.scMax[1]; y++)
{
sw_pixel_t *row = ptr + y*RLSW.framebuffer.width + RLSW.scMin[0];
for (int x = 0; x < w; x++, row++)
{
for (int i = 0; i < SW_DEPTH_PACK_COMP; i++) row->depth[i] = depth[i];
}
}
}
else
{
for (int i = 0; i < size; i++, ptr++)
{
for (int j = 0; j < SW_DEPTH_PACK_COMP; j++) ptr->depth[j] = depth[j];
}
}
}
static inline void sw_framebuffer_fill(sw_pixel_t *ptr, int size, sw_pixel_t value)
{
if (RLSW.stateFlags & SW_STATE_SCISSOR_TEST)
{
int w = RLSW.scMax[0] - RLSW.scMin[0] + 1;
for (int y = RLSW.scMin[1]; y <= RLSW.scMax[1]; y++)
{
sw_pixel_t *row = ptr + y*RLSW.framebuffer.width + RLSW.scMin[0];
for (int x = 0; x < w; x++, row++) *row = value;
}
}
else
{
for (int i = 0; i < size; i++, ptr++) *ptr = value;
}
}
static inline void sw_framebuffer_copy_fast(void* dst)
{
int size = RLSW.framebuffer.width*RLSW.framebuffer.height;
const sw_pixel_t *pixels = RLSW.framebuffer.pixels;
#if SW_COLOR_BUFFER_BITS == 8
uint8_t *dst8 = (uint8_t*)dst;
for (int i = 0; i < size; i++) dst8[i] = pixels[i].color[0];
#elif SW_COLOR_BUFFER_BITS == 16
uint16_t *dst16 = (uint16_t*)dst;
for (int i = 0; i < size; i++) dst16[i] = *(uint16_t*)pixels[i].color;
#else // 32 bits
uint32_t *dst32 = (uint32_t*)dst;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
for (int i = 0; i < size; i++)
{
const uint8_t *c = pixels[i].color;
dst32[i] = (uint32_t)c[2] | ((uint32_t)c[1] << 8) | ((uint32_t)c[0] << 16) | ((uint32_t)c[3] << 24);
}
#else // RGBA
for (int i = 0; i < size; i++) dst32[i] = *(uint32_t*)pixels[i].color;
#endif
#endif
}
#define DEFINE_FRAMEBUFFER_COPY_BEGIN(name, DST_PTR_T) \
static inline void sw_framebuffer_copy_to_##name(int x, int y, int w, int h, DST_PTR_T *dst) \
{ \
const int stride = RLSW.framebuffer.width; \
const sw_pixel_t *src = RLSW.framebuffer.pixels + (y*stride + x); \
\
for (int iy = 0; iy < h; iy++) { \
const sw_pixel_t *line = src; \
for (int ix = 0; ix < w; ix++) { \
uint8_t color[4]; \
sw_framebuffer_read_color8(color, line); \
#define DEFINE_FRAMEBUFFER_COPY_END() \
++line; \
} \
src += stride; \
} \
}
DEFINE_FRAMEBUFFER_COPY_BEGIN(GRAYSCALE, uint8_t)
{
// NTSC grayscale conversion: Y = 0.299R + 0.587G + 0.114B
uint8_t gray = (uint8_t)((color[0]*299 + color[1]*587 + color[2]*114 + 500)/1000);
*dst++ = gray;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(GRAYALPHA, uint8_t)
{
// Convert RGB to grayscale using NTSC formula
uint8_t gray = (uint8_t)((color[0]*299 + color[1]*587 + color[2]*114 + 500)/1000);
dst[0] = gray;
dst[1] = color[3]; // alpha
dst += 2;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(R5G6B5, uint16_t)
{
// Convert 8-bit RGB to 5:6:5 format
uint8_t r5 = (color[0]*31 + 127)/255;
uint8_t g6 = (color[1]*63 + 127)/255;
uint8_t b5 = (color[2]*31 + 127)/255;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t rgb565 = (b5 << 11) | (g6 << 5) | r5;
#else // RGBA
uint16_t rgb565 = (r5 << 11) | (g6 << 5) | b5;
#endif
*dst++ = rgb565;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(R8G8B8, uint8_t)
{
#if SW_GL_FRAMEBUFFER_COPY_BGRA
dst[0] = color[2];
dst[1] = color[1];
dst[2] = color[0];
#else // RGBA
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
#endif
dst += 3;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(R5G5B5A1, uint16_t)
{
uint8_t r5 = (color[0]*31 + 127)/255;
uint8_t g5 = (color[1]*31 + 127)/255;
uint8_t b5 = (color[2]*31 + 127)/255;
uint8_t a1 = (color[3] >= 128)? 1 : 0;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t pixel = (b5 << 11) | (g5 << 6) | (r5 << 1) | a1;
#else // RGBA
uint16_t pixel = (r5 << 11) | (g5 << 6) | (b5 << 1) | a1;
#endif
*dst++ = pixel;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(R4G4B4A4, uint16_t)
{
uint8_t r4 = (color[0]*15 + 127)/255;
uint8_t g4 = (color[1]*15 + 127)/255;
uint8_t b4 = (color[2]*15 + 127)/255;
uint8_t a4 = (color[3]*15 + 127)/255;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t pixel = (b4 << 12) | (g4 << 8) | (r4 << 4) | a4;
#else // RGBA
uint16_t pixel = (r4 << 12) | (g4 << 8) | (b4 << 4) | a4;
#endif
*dst++ = pixel;
}
DEFINE_FRAMEBUFFER_COPY_END()
DEFINE_FRAMEBUFFER_COPY_BEGIN(R8G8B8A8, uint8_t)
{
#if SW_GL_FRAMEBUFFER_COPY_BGRA
dst[0] = color[2];
dst[1] = color[1];
dst[2] = color[0];
#else // RGBA
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
#endif
dst[3] = color[3];
dst += 4;
}
DEFINE_FRAMEBUFFER_COPY_END()
#define DEFINE_FRAMEBUFFER_BLIT_BEGIN(name, DST_PTR_T) \
static inline void sw_framebuffer_blit_to_##name( \
int xDst, int yDst, int wDst, int hDst, \
int xSrc, int ySrc, int wSrc, int hSrc, \
DST_PTR_T *dst) \
{ \
const sw_pixel_t *srcBase = RLSW.framebuffer.pixels; \
const int fbWidth = RLSW.framebuffer.width; \
\
const uint32_t xScale = ((uint32_t)wSrc << 16)/(uint32_t)wDst; \
const uint32_t yScale = ((uint32_t)hSrc << 16)/(uint32_t)hDst; \
\
for (int dy = 0; dy < hDst; dy++) { \
uint32_t yFix = ((uint32_t)ySrc << 16) + dy*yScale; \
int sy = yFix >> 16; \
const sw_pixel_t *srcLine = srcBase + sy*fbWidth + xSrc; \
\
const sw_pixel_t *srcPtr = srcLine; \
for (int dx = 0; dx < wDst; dx++) { \
uint32_t xFix = dx*xScale; \
int sx = xFix >> 16; \
const sw_pixel_t *pixel = srcPtr + sx; \
uint8_t color[4]; \
sw_framebuffer_read_color8(color, pixel);
#define DEFINE_FRAMEBUFFER_BLIT_END() \
} \
} \
}
DEFINE_FRAMEBUFFER_BLIT_BEGIN(GRAYSCALE, uint8_t)
{
uint8_t gray = (uint8_t)((color[0]*299 + color[1]*587 + color[2]*114 + 500)/1000);
*dst++ = gray;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(GRAYALPHA, uint8_t)
{
uint8_t gray = (uint8_t)((color[0]*299 + color[1]*587 + color[2]*114 + 500)/1000);
dst[0] = gray;
dst[1] = color[3]; // alpha
dst += 2;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(R5G6B5, uint16_t)
{
uint8_t r5 = (color[0]*31 + 127)/255;
uint8_t g6 = (color[1]*63 + 127)/255;
uint8_t b5 = (color[2]*31 + 127)/255;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t rgb565 = (b5 << 11) | (g6 << 5) | r5;
#else // RGBA
uint16_t rgb565 = (r5 << 11) | (g6 << 5) | b5;
#endif
*dst++ = rgb565;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(R8G8B8, uint8_t)
{
#if SW_GL_FRAMEBUFFER_COPY_BGRA
dst[0] = color[2];
dst[1] = color[1];
dst[2] = color[0];
#else // RGBA
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
#endif
dst += 3;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(R5G5B5A1, uint16_t)
{
uint8_t r5 = (color[0]*31 + 127)/255;
uint8_t g5 = (color[1]*31 + 127)/255;
uint8_t b5 = (color[2]*31 + 127)/255;
uint8_t a1 = (color[3] >= 128)? 1 : 0;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t pixel = (b5 << 11) | (g5 << 6) | (r5 << 1) | a1;
#else // RGBA
uint16_t pixel = (r5 << 11) | (g5 << 6) | (b5 << 1) | a1;
#endif
*dst++ = pixel;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(R4G4B4A4, uint16_t)
{
uint8_t r4 = (color[0]*15 + 127)/255;
uint8_t g4 = (color[1]*15 + 127)/255;
uint8_t b4 = (color[2]*15 + 127)/255;
uint8_t a4 = (color[3]*15 + 127)/255;
#if SW_GL_FRAMEBUFFER_COPY_BGRA
uint16_t pixel = (b4 << 12) | (g4 << 8) | (r4 << 4) | a4;
#else // RGBA
uint16_t pixel = (r4 << 12) | (g4 << 8) | (b4 << 4) | a4;
#endif
*dst++ = pixel;
}
DEFINE_FRAMEBUFFER_BLIT_END()
DEFINE_FRAMEBUFFER_BLIT_BEGIN(R8G8B8A8, uint8_t)
{
#if SW_GL_FRAMEBUFFER_COPY_BGRA
dst[0] = color[2];
dst[1] = color[1];
dst[2] = color[0];
#else // RGBA
dst[0] = color[0];
dst[1] = color[1];
dst[2] = color[2];
#endif
dst[3] = color[3];
dst += 4;
}
DEFINE_FRAMEBUFFER_BLIT_END()
//-------------------------------------------------------------------------------------------
// Pixel format management functions
//-------------------------------------------------------------------------------------------
static inline int sw_get_pixel_format(SWformat format, SWtype type)
{
int channels = 0;
int bitsPerChannel = 8; // Default: 8 bits per channel
// 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_UNCOMPRESSED_GRAYSCALE;
if (channels == 2) return SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA;
if (channels == 3) return SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8;
if (channels == 4) return SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8;
}
else if (bitsPerChannel == 16)
{
if (channels == 1) return SW_PIXELFORMAT_UNCOMPRESSED_R16;
if (channels == 3) return SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16;
if (channels == 4) return SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16;
}
else if (bitsPerChannel == 32)
{
if (channels == 1) return SW_PIXELFORMAT_UNCOMPRESSED_R32;
if (channels == 3) return SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32;
if (channels == 4) return SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32;
}
return SW_PIXELFORMAT_UNKNOWN;
}
static inline void sw_get_pixel(uint8_t *color, const void *pixels, uint32_t offset, sw_pixelformat_t format)
{
switch (format)
{
case SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE:
{
uint8_t gray = ((const uint8_t*)pixels)[offset];
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA:
{
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];
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5:
{
uint16_t pixel = ((const uint16_t*)pixels)[offset];
color[0] = ((pixel >> 11) & 0x1F)*255/31; // R (5 bits)
color[1] = ((pixel >> 5) & 0x3F)*255/63; // G (6 bits)
color[2] = (pixel & 0x1F)*255/31; // B (5 bits)
color[3] = 255;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8:
{
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;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1:
{
uint16_t pixel = ((const uint16_t*)pixels)[offset];
color[0] = ((pixel >> 11) & 0x1F)*255/31; // R (5 bits)
color[1] = ((pixel >> 6) & 0x1F)*255/31; // G (5 bits)
color[2] = ((pixel >> 1) & 0x1F)*255/31; // B (5 bits)
color[3] = (pixel & 0x01)*255; // A (1 bit)
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4:
{
uint16_t pixel = ((const uint16_t*)pixels)[offset];
color[0] = ((pixel >> 12) & 0x0F)*255/15; // R (4 bits)
color[1] = ((pixel >> 8) & 0x0F)*255/15; // G (4 bits)
color[2] = ((pixel >> 4) & 0x0F)*255/15; // B (4 bits)
color[3] = (pixel & 0x0F)*255/15; // A (4 bits)
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8:
{
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];
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R32:
{
float val = ((const float*)pixels)[offset];
uint8_t gray = (uint8_t)(val*255.0f);
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32:
{
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;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32:
{
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);
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R16:
{
uint16_t val = ((const uint16_t*)pixels)[offset];
uint8_t gray = sw_half_to_float(val)*SW_INV_255;
color[0] = gray;
color[1] = gray;
color[2] = gray;
color[3] = 255;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16:
{
const uint16_t *src = &((const uint16_t*)pixels)[offset*3];
color[0] = sw_half_to_float(src[0])*SW_INV_255;
color[1] = sw_half_to_float(src[1])*SW_INV_255;
color[2] = sw_half_to_float(src[2])*SW_INV_255;
color[3] = 255;
break;
}
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16:
{
const uint16_t *src = &((const uint16_t*)pixels)[offset*4];
color[0] = sw_half_to_float(src[0])*SW_INV_255;
color[1] = sw_half_to_float(src[1])*SW_INV_255;
color[2] = sw_half_to_float(src[2])*SW_INV_255;
color[3] = sw_half_to_float(src[3])*SW_INV_255;
break;
}
case SW_PIXELFORMAT_UNKNOWN:
default:
{
color[0] = 0;
color[1] = 0;
color[2] = 0;
color[3] = 0;
break;
}
}
}
//-------------------------------------------------------------------------------------------
// Texture sampling functionality
//-------------------------------------------------------------------------------------------
static inline void sw_texture_fetch(float* color, const sw_texture_t* tex, int x, int y)
{
sw_float_from_unorm8_simd(color, &tex->pixels[4*(y*tex->width + x)]);
}
static inline void sw_texture_sample_nearest(float *color, const sw_texture_t *tex, float u, float v)
{
u = (tex->sWrap == SW_REPEAT)? sw_fract(u) : sw_saturate(u);
v = (tex->tWrap == SW_REPEAT)? sw_fract(v) : sw_saturate(v);
int x = u*tex->width;
int y = v*tex->height;
sw_texture_fetch(color, tex, x, y);
}
static inline void sw_texture_sample_linear(float *color, const sw_texture_t *tex, float u, float v)
{
// TODO: With a bit more cleverness we could clearly reduce the
// number of operations here, but for now it works fine
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;
// NOTE: If the textures are POT we could avoid the division for SW_REPEAT
if (tex->sWrap == SW_CLAMP)
{
x0 = (x0 > tex->wMinus1)? tex->wMinus1 : x0;
x1 = (x1 > tex->wMinus1)? tex->wMinus1 : x1;
}
else
{
x0 = (x0%tex->width + tex->width)%tex->width;
x1 = (x1%tex->width + tex->width)%tex->width;
}
if (tex->tWrap == SW_CLAMP)
{
y0 = (y0 > tex->hMinus1)? tex->hMinus1 : y0;
y1 = (y1 > tex->hMinus1)? tex->hMinus1 : y1;
}
else
{
y0 = (y0%tex->height + tex->height)%tex->height;
y1 = (y1%tex->height + tex->height)%tex->height;
}
float c00[4], c10[4], c01[4], c11[4];
sw_texture_fetch(c00, tex, x0, y0);
sw_texture_fetch(c10, tex, x1, y0);
sw_texture_fetch(c01, tex, x0, y1);
sw_texture_fetch(c11, tex, x1, y1);
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);
}
}
static inline void sw_texture_sample(float *color, const sw_texture_t *tex, float u, float v, float dUdx, float dUdy, float dVdx, float dVdy)
{
// Previous method: There is 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;
// Calculate the derivatives for each axis
float dU2 = dUdx*dUdx + dUdy*dUdy;
float dV2 = dVdx*dVdx + dVdy*dVdy;
float L2 = (dU2 > dV2)? dU2 : dV2;
SWfilter filter = (L2 > 1.0f)? tex->minFilter : tex->magFilter;
switch (filter)
{
case SW_NEAREST: sw_texture_sample_nearest(color, tex, u, v); break;
case SW_LINEAR: sw_texture_sample_linear(color, tex, u, v); break;
default: break;
}
}
//-------------------------------------------------------------------------------------------
// Color blending functionality
//-------------------------------------------------------------------------------------------
static inline void sw_factor_zero(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = factor[1] = factor[2] = factor[3] = 0.0f;
}
static inline void sw_factor_one(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = factor[1] = factor[2] = factor[3] = 1.0f;
}
static inline void sw_factor_src_color(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = src[0]; factor[1] = src[1]; factor[2] = src[2]; factor[3] = src[3];
}
static inline void sw_factor_one_minus_src_color(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = 1.0f - src[0]; factor[1] = 1.0f - src[1];
factor[2] = 1.0f - src[2]; factor[3] = 1.0f - src[3];
}
static inline void sw_factor_src_alpha(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = factor[1] = factor[2] = factor[3] = src[3];
}
static inline void sw_factor_one_minus_src_alpha(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
float invAlpha = 1.0f - src[3];
factor[0] = factor[1] = factor[2] = factor[3] = invAlpha;
}
static inline void sw_factor_dst_alpha(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = factor[1] = factor[2] = factor[3] = dst[3];
}
static inline void sw_factor_one_minus_dst_alpha(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
float invAlpha = 1.0f - dst[3];
factor[0] = factor[1] = factor[2] = factor[3] = invAlpha;
}
static inline void sw_factor_dst_color(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = dst[0]; factor[1] = dst[1]; factor[2] = dst[2]; factor[3] = dst[3];
}
static inline void sw_factor_one_minus_dst_color(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = 1.0f - dst[0]; factor[1] = 1.0f - dst[1];
factor[2] = 1.0f - dst[2]; factor[3] = 1.0f - dst[3];
}
static inline void sw_factor_src_alpha_saturate(float *SW_RESTRICT factor, const float *SW_RESTRICT src, const float *SW_RESTRICT dst)
{
factor[0] = factor[1] = factor[2] = 1.0f;
factor[3] = (src[3] < 1.0f)? src[3] : 1.0f;
}
static inline void sw_blend_colors(float *SW_RESTRICT dst/*[4]*/, const float *SW_RESTRICT src/*[4]*/)
{
float srcFactor[4], dstFactor[4];
RLSW.srcFactorFunc(srcFactor, src, dst);
RLSW.dstFactorFunc(dstFactor, src, dst);
dst[0] = srcFactor[0]*src[0] + dstFactor[0]*dst[0];
dst[1] = srcFactor[1]*src[1] + dstFactor[1]*dst[1];
dst[2] = srcFactor[2]*src[2] + dstFactor[2]*dst[2];
dst[3] = srcFactor[3]*src[3] + dstFactor[3]*dst[3];
}
//-------------------------------------------------------------------------------------------
// Projection helper functions
//-------------------------------------------------------------------------------------------
static inline void sw_project_ndc_to_screen(float screen[2], const float ndc[4])
{
screen[0] = RLSW.vpCenter[0] + ndc[0]*RLSW.vpHalf[0] + 0.5f;
screen[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 inline 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->homogeneous); \
int outputCount = 0; \
\
for (int i = 0; i < n; i++) { \
const sw_vertex_t *curr = &input[i]; \
int currInside = FUNC_IS_INSIDE(curr->homogeneous); \
\
/* If transition between interior/exterior, calculate intersection point */ \
if (prevInside != currInside) { \
float t = FUNC_COMPUTE_T(prev->homogeneous, curr->homogeneous); \
sw_lerp_vertex_PTCH(&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 inline 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.stateFlags & 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);
}
// Triangle rendering logic
//-------------------------------------------------------------------------------------------
static inline 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,
// we perform the winding order test in homogeneous coordinates 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 homogeneous coordinates into local variables
const float *h0 = RLSW.vertexBuffer[0].homogeneous;
const float *h1 = RLSW.vertexBuffer[1].homogeneous;
const float *h2 = RLSW.vertexBuffer[2].homogeneous;
// Compute a value proportional to the signed area in the projected 2D plane,
// calculated directly using homogeneous 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 homogeneous
// space and its relationship to the projected 2D winding order, even with
// negative w values
// The determinant formula used here is:
// h0.x*(h1.y*h2.w - h2.y*h1.w) +
// h1.x*(h2.y*h0.w - h0.y*h2.w) +
// h2.x*(h0.y*h1.w - h1.y*h0.w)
const float hSgnArea =
h0[0]*(h1[1]*h2[3] - h2[1]*h1[3]) +
h1[0]*(h2[1]*h0[3] - h0[1]*h2[3]) +
h2[0]*(h0[1]*h1[3] - h1[1]*h0[3]);
// Discard the triangle if its winding order (determined by the sign
// of the homogeneous area/determinant) matches the culled direction
// A positive hSgnArea 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 hSgnArea 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)? (hSgnArea < 0) : (hSgnArea > 0); // Cull if winding is "clockwise" : "counter-clockwise"
}
static inline void sw_triangle_clip_and_project(void)
{
sw_vertex_t *polygon = RLSW.vertexBuffer;
int *vertexCounter = &RLSW.vertexCounter;
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 = 1.0f/v->homogeneous[3];
v->homogeneous[3] = wRcp;
// Division of XYZ coordinates by weight
v->homogeneous[0] *= wRcp;
v->homogeneous[1] *= wRcp;
v->homogeneous[2] *= 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->screen, v->homogeneous);
}
}
}
#define DEFINE_TRIANGLE_RASTER_SCANLINE(FUNC_NAME, ENABLE_TEXTURE, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND) \
static inline void FUNC_NAME(const sw_texture_t *tex, const sw_vertex_t *start, \
const sw_vertex_t *end, float dUdy, float dVdy) \
{ \
/* Gets the start and end coordinates */ \
int xStart = (int)start->screen[0]; \
int xEnd = (int)end->screen[0]; \
\
/* Avoid empty lines */ \
if (xStart == xEnd) return; \
\
/* Compute the subpixel distance to traverse before the first pixel */ \
float xSubstep = 1.0f - sw_fract(start->screen[0]); \
\
/* Compute the inverse horizontal distance along the X axis */ \
float dxRcp = 1.0f/(end->screen[0] - start->screen[0]); \
\
/* Compute the interpolation steps along the X axis */ \
float dZdx = (end->homogeneous[2] - start->homogeneous[2])*dxRcp; \
float dWdx = (end->homogeneous[3] - start->homogeneous[3])*dxRcp; \
\
float dCdx[4] = { \
(end->color[0] - start->color[0])*dxRcp, \
(end->color[1] - start->color[1])*dxRcp, \
(end->color[2] - start->color[2])*dxRcp, \
(end->color[3] - start->color[3])*dxRcp \
}; \
\
float dUdx = 0.0f; \
float dVdx = 0.0f; \
if (ENABLE_TEXTURE) { \
dUdx = (end->texcoord[0] - start->texcoord[0])*dxRcp; \
dVdx = (end->texcoord[1] - start->texcoord[1])*dxRcp; \
} \
\
/* Initializing the interpolation starting values */ \
float z = start->homogeneous[2] + dZdx*xSubstep; \
float w = start->homogeneous[3] + dWdx*xSubstep; \
\
float color[4] = { \
start->color[0] + dCdx[0]*xSubstep, \
start->color[1] + dCdx[1]*xSubstep, \
start->color[2] + dCdx[2]*xSubstep, \
start->color[3] + dCdx[3]*xSubstep \
}; \
\
float u = 0.0f; \
float v = 0.0f; \
if (ENABLE_TEXTURE) { \
u = start->texcoord[0] + dUdx*xSubstep; \
v = start->texcoord[1] + dVdx*xSubstep; \
} \
\
/* Pre-calculate the starting pointers for the framebuffer row */ \
int y = (int)start->screen[1]; \
sw_pixel_t *ptr = RLSW.framebuffer.pixels + y*RLSW.framebuffer.width + xStart; \
\
/* Scanline rasterization */ \
for (int x = xStart; x < xEnd; x++) \
{ \
float wRcp = 1.0f/w; \
float srcColor[4] = { \
color[0]*wRcp, \
color[1]*wRcp, \
color[2]*wRcp, \
color[3]*wRcp \
}; \
\
if (ENABLE_DEPTH_TEST) \
{ \
/* TODO: Implement different depth funcs? */ \
float depth = sw_framebuffer_read_depth(ptr); \
if (z > depth) goto discard; \
} \
\
/* TODO: Implement depth mask */ \
sw_framebuffer_write_depth(ptr, z); \
\
if (ENABLE_TEXTURE) \
{ \
float texColor[4]; \
float s = u*wRcp; \
float t = v*wRcp; \
sw_texture_sample(texColor, tex, s, t, dUdx, dUdy, dVdx, dVdy); \
srcColor[0] *= texColor[0]; \
srcColor[1] *= texColor[1]; \
srcColor[2] *= texColor[2]; \
srcColor[3] *= texColor[3]; \
} \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
sw_framebuffer_read_color(dstColor, ptr); \
sw_blend_colors(dstColor, srcColor); \
sw_framebuffer_write_color(ptr, dstColor); \
} \
else \
{ \
sw_framebuffer_write_color(ptr, srcColor); \
} \
\
/* Increment the interpolation parameter, UVs, and pointers */ \
discard: \
z += dZdx; \
w += dWdx; \
color[0] += dCdx[0]; \
color[1] += dCdx[1]; \
color[2] += dCdx[2]; \
color[3] += dCdx[3]; \
if (ENABLE_TEXTURE) \
{ \
u += dUdx; \
v += dVdx; \
} \
++ptr; \
} \
}
#define DEFINE_TRIANGLE_RASTER(FUNC_NAME, FUNC_SCANLINE, ENABLE_TEXTURE) \
static inline void FUNC_NAME(const sw_vertex_t *v0, const sw_vertex_t *v1, \
const sw_vertex_t *v2, const sw_texture_t *tex) \
{ \
/* Swap vertices by increasing y */ \
if (v0->screen[1] > v1->screen[1]) { const sw_vertex_t *tmp = v0; v0 = v1; v1 = tmp; } \
if (v1->screen[1] > v2->screen[1]) { const sw_vertex_t *tmp = v1; v1 = v2; v2 = tmp; } \
if (v0->screen[1] > v1->screen[1]) { const sw_vertex_t *tmp = v0; v0 = v1; v1 = tmp; } \
\
/* Extracting coordinates from the sorted vertices */ \
float x0 = v0->screen[0], y0 = v0->screen[1]; \
float x1 = v1->screen[0], y1 = v1->screen[1]; \
float x2 = v2->screen[0], y2 = v2->screen[1]; \
\
/* Compute height differences */ \
float h02 = y2 - y0; \
float h01 = y1 - y0; \
float h12 = y2 - y1; \
\
if (h02 < 1e-6f) return; \
\
/* Precompute the inverse values without additional checks */ \
float h02Rcp = 1.0f/h02; \
float h01Rcp = (h01 > 1e-6f)? 1.0f/h01 : 0.0f; \
float h12Rcp = (h12 > 1e-6f)? 1.0f/h12 : 0.0f; \
\
/* Pre-calculation of slopes */ \
float dXdy02 = (x2 - x0)*h02Rcp; \
float dXdy01 = (x1 - x0)*h01Rcp; \
float dXdy12 = (x2 - x1)*h12Rcp; \
\
/* Y subpixel correction */ \
float y0Substep = 1.0f - sw_fract(y0); \
float y1Substep = 1.0f - sw_fract(y1); \
\
/* Y bounds (vertical clipping) */ \
int yTop = (int)y0; \
int yMid = (int)y1; \
int yBot = (int)y2; \
\
/* Compute gradients for each side of the triangle */ \
sw_vertex_t dVXdy02, dVXdy01, dVXdy12; \
sw_get_vertex_grad_PTCH(&dVXdy02, v0, v2, h02Rcp); \
sw_get_vertex_grad_PTCH(&dVXdy01, v0, v1, h01Rcp); \
sw_get_vertex_grad_PTCH(&dVXdy12, v1, v2, h12Rcp); \
\
/* Get a copy of vertices for interpolation and apply substep correction */ \
sw_vertex_t vLeft = *v0, vRight = *v0; \
sw_add_vertex_grad_scaled_PTCH(&vLeft, &dVXdy02, y0Substep); \
sw_add_vertex_grad_scaled_PTCH(&vRight, &dVXdy01, y0Substep); \
\
vLeft.screen[0] += dXdy02*y0Substep; \
vRight.screen[0] += dXdy01*y0Substep; \
\
/* Scanline for the upper part of the triangle */ \
for (int y = yTop; y < yMid; y++) \
{ \
vLeft.screen[1] = vRight.screen[1] = y; \
\
if (vLeft.screen[0] < vRight.screen[0]) FUNC_SCANLINE(tex, &vLeft, &vRight, dVXdy02.texcoord[0], dVXdy02.texcoord[1]); \
else FUNC_SCANLINE(tex, &vRight, &vLeft, dVXdy02.texcoord[0], dVXdy02.texcoord[1]); \
\
sw_add_vertex_grad_PTCH(&vLeft, &dVXdy02); \
vLeft.screen[0] += dXdy02; \
\
sw_add_vertex_grad_PTCH(&vRight, &dVXdy01); \
vRight.screen[0] += dXdy01; \
} \
\
/* Get a copy of next right for interpolation and apply substep correction */ \
vRight = *v1; \
sw_add_vertex_grad_scaled_PTCH(&vRight, &dVXdy12, y1Substep); \
vRight.screen[0] += dXdy12*y1Substep; \
\
/* Scanline for the lower part of the triangle */ \
for (int y = yMid; y < yBot; y++) \
{ \
vLeft.screen[1] = vRight.screen[1] = y; \
\
if (vLeft.screen[0] < vRight.screen[0]) FUNC_SCANLINE(tex, &vLeft, &vRight, dVXdy02.texcoord[0], dVXdy02.texcoord[1]); \
else FUNC_SCANLINE(tex, &vRight, &vLeft, dVXdy02.texcoord[0], dVXdy02.texcoord[1]); \
\
sw_add_vertex_grad_PTCH(&vLeft, &dVXdy02); \
vLeft.screen[0] += dXdy02; \
\
sw_add_vertex_grad_PTCH(&vRight, &dVXdy12); \
vRight.screen[0] += dXdy12; \
} \
}
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline, 0, 0, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX, 1, 0, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_DEPTH, 0, 1, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_BLEND, 0, 0, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_DEPTH, 1, 1, 0)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_BLEND, 1, 0, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_DEPTH_BLEND, 0, 1, 1)
DEFINE_TRIANGLE_RASTER_SCANLINE(sw_triangle_raster_scanline_TEX_DEPTH_BLEND, 1, 1, 1)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster, sw_triangle_raster_scanline, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX, sw_triangle_raster_scanline_TEX, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_DEPTH, sw_triangle_raster_scanline_DEPTH, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_BLEND, sw_triangle_raster_scanline_BLEND, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH, sw_triangle_raster_scanline_TEX_DEPTH, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_BLEND, sw_triangle_raster_scanline_TEX_BLEND, true)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_DEPTH_BLEND, sw_triangle_raster_scanline_DEPTH_BLEND, false)
DEFINE_TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH_BLEND, sw_triangle_raster_scanline_TEX_DEPTH_BLEND, true)
static inline void sw_triangle_render(void)
{
if (RLSW.stateFlags & SW_STATE_CULL_FACE)
{
if (!sw_triangle_face_culling()) return;
}
sw_triangle_clip_and_project();
if (RLSW.vertexCounter < 3) return;
#define TRIANGLE_RASTER(RASTER_FUNC) \
{ \
for (int i = 0; i < RLSW.vertexCounter - 2; i++) \
{ \
RASTER_FUNC( \
&RLSW.vertexBuffer[0], \
&RLSW.vertexBuffer[i + 1], \
&RLSW.vertexBuffer[i + 2], \
&RLSW.loadedTextures[RLSW.currentTexture] \
); \
} \
}
uint32_t state = RLSW.stateFlags;
if (RLSW.currentTexture == 0) state &= ~SW_STATE_TEXTURE_2D;
if ((RLSW.srcFactor == SW_ONE) && (RLSW.dstFactor == SW_ZERO)) state &= ~SW_STATE_BLEND;
if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_DEPTH_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_TEX_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST)) TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH)
else if (SW_STATE_CHECK_EX(state, SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST)) TRIANGLE_RASTER(sw_triangle_raster_DEPTH)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D)) TRIANGLE_RASTER(sw_triangle_raster_TEX)
else TRIANGLE_RASTER(sw_triangle_raster)
#undef TRIANGLE_RASTER
}
//-------------------------------------------------------------------------------------------
// Quad rendering logic
//-------------------------------------------------------------------------------------------
static inline 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,
// we perform the winding order test in homogeneous coordinates 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. We use the homogeneous triangle
// winding test on this first triangle
// Preload homogeneous coordinates into local variables
const float *h0 = RLSW.vertexBuffer[0].homogeneous;
const float *h1 = RLSW.vertexBuffer[1].homogeneous;
const float *h2 = RLSW.vertexBuffer[2].homogeneous;
// NOTE: h3 is not needed for this test
// const float *h3 = RLSW.vertexBuffer[3].homogeneous;
// Compute a value proportional to the signed area of the triangle P0 P1 P2
// in the projected 2D plane, calculated directly using homogeneous 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 homogeneous space and its relationship to the projected 2D winding order,
// even with negative w values
// The determinant formula used here is:
// h0.x*(h1.y*h2.w - h2.y*h1.w) +
// h1.x*(h2.y*h0.w - h0.y*h2.w) +
// h2.x*(h0.y*h1.w - h1.y*h0.w)
const float hSgnArea =
h0[0]*(h1[1]*h2[3] - h2[1]*h1[3]) +
h1[0]*(h2[1]*h0[3] - h0[1]*h2[3]) +
h2[0]*(h0[1]*h1[3] - h1[1]*h0[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 hSgnArea typically corresponds to a counter-clockwise
// winding in the projected space when all w > 0
// A value of 0 for hSgnArea 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)? (hSgnArea < 0.0f) : (hSgnArea > 0.0f); // Cull if winding is "clockwise" : "counter-clockwise"
}
static inline void sw_quad_clip_and_project(void)
{
sw_vertex_t *polygon = RLSW.vertexBuffer;
int *vertexCounter = &RLSW.vertexCounter;
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 = 1.0f/v->homogeneous[3];
v->homogeneous[3] = wRcp;
// Division of XYZ coordinates by weight
v->homogeneous[0] *= wRcp;
v->homogeneous[1] *= wRcp;
v->homogeneous[2] *= 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->screen, v->homogeneous);
}
}
}
static inline bool sw_quad_is_axis_aligned(void)
{
// Reject quads with perspective projection
// The fast path assumes affine (non-perspective) quads,
// so we require all vertices to have homogeneous w = 1.0
for (int i = 0; i < 4; i++)
{
if (RLSW.vertexBuffer[i].homogeneous[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.vertexBuffer[0].screen;
const float *p1 = RLSW.vertexBuffer[1].screen;
const float *p2 = RLSW.vertexBuffer[2].screen;
const float *p3 = RLSW.vertexBuffer[3].screen;
// 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 inline void sw_quad_sort_cw(const sw_vertex_t* *output)
{
const sw_vertex_t *input = RLSW.vertexBuffer;
// Calculate the centroid of the quad
float cx = (input[0].screen[0] + input[1].screen[0] +
input[2].screen[0] + input[3].screen[0])*0.25f;
float cy = (input[0].screen[1] + input[1].screen[1] +
input[2].screen[1] + input[3].screen[1])*0.25f;
// Calculate the angle of each vertex relative to the center
// and assign them directly to their correct position
const sw_vertex_t *corners[4] = { 0 };
for (int i = 0; i < 4; i++)
{
float dx = input[i].screen[0] - cx;
float dy = input[i].screen[1] - cy;
// Determine the quadrant (clockwise from top-left)
// top-left: dx < 0, dy < 0
// top-right: dx >= 0, dy < 0
// bottom-right: dx >= 0, dy >= 0
// bottom-left: dx < 0, dy >= 0
int idx;
if (dy < 0) idx = (dx < 0)? 0 : 1; // Top row
else idx = (dx < 0)? 3 : 2; // Bottom row
corners[idx] = &input[i];
}
output[0] = corners[0]; // top-left
output[1] = corners[1]; // top-right
output[2] = corners[2]; // bottom-right
output[3] = corners[3]; // bottom-left
}
// TODO: REVIEW: Could a perfectly aligned quad, where one of the four points has a different depth,
// still appear perfectly aligned from a certain point of view?
// Because in that case, we would still need to perform perspective division for textures and colors...
#define DEFINE_QUAD_RASTER_AXIS_ALIGNED(FUNC_NAME, ENABLE_TEXTURE, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND) \
static inline void FUNC_NAME(void) \
{ \
const sw_vertex_t *sortedVerts[4]; \
sw_quad_sort_cw(sortedVerts); \
\
const sw_vertex_t *v0 = sortedVerts[0]; \
const sw_vertex_t *v1 = sortedVerts[1]; \
const sw_vertex_t *v2 = sortedVerts[2]; \
const sw_vertex_t *v3 = sortedVerts[3]; \
\
/* Screen bounds (axis-aligned) */ \
int xMin = (int)v0->screen[0]; \
int yMin = (int)v0->screen[1]; \
int xMax = (int)v2->screen[0]; \
int yMax = (int)v2->screen[1]; \
\
float w = v2->screen[0] - v0->screen[0]; \
float h = v2->screen[1] - v0->screen[1]; \
\
if ((w == 0) || (h == 0)) return; \
\
float wRcp = (w > 0.0f)? 1.0f/w : 0.0f; \
float hRcp = (h > 0.0f)? 1.0f/h : 0.0f; \
\
/* Subpixel corrections */ \
float xSubstep = 1.0f - sw_fract(v0->screen[0]); \
float ySubstep = 1.0f - sw_fract(v0->screen[1]); \
\
/* Calculation of vertex gradients in X and Y */ \
float dUdx = 0.0f, dVdx = 0.0f; \
float dUdy = 0.0f, dVdy = 0.0f; \
if (ENABLE_TEXTURE) { \
dUdx = (v1->texcoord[0] - v0->texcoord[0])*wRcp; \
dVdx = (v1->texcoord[1] - v0->texcoord[1])*wRcp; \
dUdy = (v3->texcoord[0] - v0->texcoord[0])*hRcp; \
dVdy = (v3->texcoord[1] - v0->texcoord[1])*hRcp; \
} \
\
float dCdx[4], dCdy[4]; \
dCdx[0] = (v1->color[0] - v0->color[0])*wRcp; \
dCdx[1] = (v1->color[1] - v0->color[1])*wRcp; \
dCdx[2] = (v1->color[2] - v0->color[2])*wRcp; \
dCdx[3] = (v1->color[3] - v0->color[3])*wRcp; \
dCdy[0] = (v3->color[0] - v0->color[0])*hRcp; \
dCdy[1] = (v3->color[1] - v0->color[1])*hRcp; \
dCdy[2] = (v3->color[2] - v0->color[2])*hRcp; \
dCdy[3] = (v3->color[3] - v0->color[3])*hRcp; \
\
float dZdx, dZdy; \
dZdx = (v1->homogeneous[2] - v0->homogeneous[2])*wRcp; \
dZdy = (v3->homogeneous[2] - v0->homogeneous[2])*hRcp; \
\
/* Start of quad rasterization */ \
const sw_texture_t *tex; \
if (ENABLE_TEXTURE) tex = &RLSW.loadedTextures[RLSW.currentTexture]; \
\
sw_pixel_t *pixels = RLSW.framebuffer.pixels; \
int wDst = RLSW.framebuffer.width; \
\
float zScanline = v0->homogeneous[2] + dZdx*xSubstep + dZdy*ySubstep; \
float uScanline = v0->texcoord[0] + dUdx*xSubstep + dUdy*ySubstep; \
float vScanline = v0->texcoord[1] + dVdx*xSubstep + dVdy*ySubstep; \
\
float colorScanline[4] = { \
v0->color[0] + dCdx[0]*xSubstep + dCdy[0]*ySubstep, \
v0->color[1] + dCdx[1]*xSubstep + dCdy[1]*ySubstep, \
v0->color[2] + dCdx[2]*xSubstep + dCdy[2]*ySubstep, \
v0->color[3] + dCdx[3]*xSubstep + dCdy[3]*ySubstep \
}; \
\
for (int y = yMin; y < yMax; y++) \
{ \
sw_pixel_t *ptr = pixels + y*wDst + xMin; \
\
float z = zScanline; \
float u = uScanline; \
float v = vScanline; \
\
float color[4] = { \
colorScanline[0], \
colorScanline[1], \
colorScanline[2], \
colorScanline[3] \
}; \
\
/* Scanline rasterization */ \
for (int x = xMin; x < xMax; x++) \
{ \
/* Pixel color computation */ \
float srcColor[4] = { \
color[0], \
color[1], \
color[2], \
color[3] \
}; \
\
/* Test and write depth */ \
if (ENABLE_DEPTH_TEST) \
{ \
/* TODO: Implement different depth funcs? */ \
float depth = sw_framebuffer_read_depth(ptr); \
if (z > depth) goto discard; \
} \
\
/* TODO: Implement depth mask */ \
sw_framebuffer_write_depth(ptr, z); \
\
if (ENABLE_TEXTURE) \
{ \
float texColor[4]; \
sw_texture_sample(texColor, tex, u, v, dUdx, dUdy, dVdx, dVdy); \
srcColor[0] *= texColor[0]; \
srcColor[1] *= texColor[1]; \
srcColor[2] *= texColor[2]; \
srcColor[3] *= texColor[3]; \
} \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
sw_framebuffer_read_color(dstColor, ptr); \
sw_blend_colors(dstColor, srcColor); \
sw_framebuffer_write_color(ptr, dstColor); \
} \
else sw_framebuffer_write_color(ptr, srcColor); \
\
discard: \
z += dZdx; \
color[0] += dCdx[0]; \
color[1] += dCdx[1]; \
color[2] += dCdx[2]; \
color[3] += dCdx[3]; \
if (ENABLE_TEXTURE) \
{ \
u += dUdx; \
v += dVdx; \
} \
++ptr; \
} \
\
zScanline += dZdy; \
colorScanline[0] += dCdy[0]; \
colorScanline[1] += dCdy[1]; \
colorScanline[2] += dCdy[2]; \
colorScanline[3] += dCdy[3]; \
\
if (ENABLE_TEXTURE) \
{ \
uScanline += dUdy; \
vScanline += dVdy; \
} \
} \
}
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned, 0, 0, 0)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_TEX, 1, 0, 0)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_DEPTH, 0, 1, 0)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_BLEND, 0, 0, 1)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_TEX_DEPTH, 1, 1, 0)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_TEX_BLEND, 1, 0, 1)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_DEPTH_BLEND, 0, 1, 1)
DEFINE_QUAD_RASTER_AXIS_ALIGNED(sw_quad_raster_axis_aligned_TEX_DEPTH_BLEND, 1, 1, 1)
static inline void sw_quad_render(void)
{
if (RLSW.stateFlags & SW_STATE_CULL_FACE)
{
if (!sw_quad_face_culling()) return;
}
sw_quad_clip_and_project();
if (RLSW.vertexCounter < 3) return;
uint32_t state = RLSW.stateFlags;
if (RLSW.currentTexture == 0) state &= ~SW_STATE_TEXTURE_2D;
if ((RLSW.srcFactor == SW_ONE) && (RLSW.dstFactor == SW_ZERO)) state &= ~SW_STATE_BLEND;
if ((RLSW.vertexCounter == 4) && sw_quad_is_axis_aligned())
{
if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_quad_raster_axis_aligned_TEX_DEPTH_BLEND();
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_quad_raster_axis_aligned_DEPTH_BLEND();
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_BLEND)) sw_quad_raster_axis_aligned_TEX_BLEND();
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST)) sw_quad_raster_axis_aligned_TEX_DEPTH();
else if (SW_STATE_CHECK_EX(state, SW_STATE_BLEND)) sw_quad_raster_axis_aligned_BLEND();
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST)) sw_quad_raster_axis_aligned_DEPTH();
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D)) sw_quad_raster_axis_aligned_TEX();
else sw_quad_raster_axis_aligned();
return;
}
#define TRIANGLE_RASTER(RASTER_FUNC) \
{ \
for (int i = 0; i < RLSW.vertexCounter - 2; i++) \
{ \
RASTER_FUNC( \
&RLSW.vertexBuffer[0], \
&RLSW.vertexBuffer[i + 1], \
&RLSW.vertexBuffer[i + 2], \
&RLSW.loadedTextures[RLSW.currentTexture] \
); \
} \
}
if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_DEPTH_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_TEX_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D | SW_STATE_DEPTH_TEST)) TRIANGLE_RASTER(sw_triangle_raster_TEX_DEPTH)
else if (SW_STATE_CHECK_EX(state, SW_STATE_BLEND)) TRIANGLE_RASTER(sw_triangle_raster_BLEND)
else if (SW_STATE_CHECK_EX(state, SW_STATE_DEPTH_TEST)) TRIANGLE_RASTER(sw_triangle_raster_DEPTH)
else if (SW_STATE_CHECK_EX(state, SW_STATE_TEXTURE_2D)) TRIANGLE_RASTER(sw_triangle_raster_TEX)
else TRIANGLE_RASTER(sw_triangle_raster)
#undef TRIANGLE_RASTER
}
//-------------------------------------------------------------------------------------------
// Line rendering logic
//-------------------------------------------------------------------------------------------
static inline 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 inline bool sw_line_clip(sw_vertex_t *v0, sw_vertex_t *v1)
{
float t0 = 0.0f, t1 = 1.0f;
float dH[4], dC[4];
for (int i = 0; i < 4; i++)
{
dH[i] = v1->homogeneous[i] - v0->homogeneous[i];
dC[i] = v1->color[i] - v0->color[i];
}
// Clipping Liang-Barsky
if (!sw_line_clip_coord(v0->homogeneous[3] - v0->homogeneous[0], -dH[3] + dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[3] + v0->homogeneous[0], -dH[3] - dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[3] - v0->homogeneous[1], -dH[3] + dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[3] + v0->homogeneous[1], -dH[3] - dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[3] - v0->homogeneous[2], -dH[3] + dH[2], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[3] + v0->homogeneous[2], -dH[3] - dH[2], &t0, &t1)) return false;
// Clipping Scissor
if (RLSW.stateFlags & SW_STATE_SCISSOR_TEST)
{
if (!sw_line_clip_coord(v0->homogeneous[0] - RLSW.scClipMin[0]*v0->homogeneous[3], RLSW.scClipMin[0]*dH[3] - dH[0], &t0, &t1)) return false;
if (!sw_line_clip_coord(RLSW.scClipMax[0]*v0->homogeneous[3] - v0->homogeneous[0], dH[0] - RLSW.scClipMax[0]*dH[3], &t0, &t1)) return false;
if (!sw_line_clip_coord(v0->homogeneous[1] - RLSW.scClipMin[1]*v0->homogeneous[3], RLSW.scClipMin[1]*dH[3] - dH[1], &t0, &t1)) return false;
if (!sw_line_clip_coord(RLSW.scClipMax[1]*v0->homogeneous[3] - v0->homogeneous[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->homogeneous[i] = v0->homogeneous[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->homogeneous[i] += t0*dH[i];
v0->color[i] += t0*dC[i];
}
}
return true;
}
static inline bool sw_line_clip_and_project(sw_vertex_t *v0, sw_vertex_t *v1)
{
if (!sw_line_clip(v0, v1)) return false;
// Convert homogeneous coordinates to NDC
v0->homogeneous[3] = 1.0f/v0->homogeneous[3];
v1->homogeneous[3] = 1.0f/v1->homogeneous[3];
for (int i = 0; i < 3; i++)
{
v0->homogeneous[i] *= v0->homogeneous[3];
v1->homogeneous[i] *= v1->homogeneous[3];
}
// Convert NDC coordinates to screen space
sw_project_ndc_to_screen(v0->screen, v0->homogeneous);
sw_project_ndc_to_screen(v1->screen, v1->homogeneous);
return true;
}
#define DEFINE_LINE_RASTER(FUNC_NAME, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND) \
static inline void FUNC_NAME(const sw_vertex_t *v0, const sw_vertex_t *v1) \
{ \
float x0 = v0->screen[0]; \
float y0 = v0->screen[1]; \
float x1 = v1->screen[0]; \
float y1 = v1->screen[1]; \
\
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); \
} \
\
/* Compute per pixel increments */ \
float xInc = dx/steps; \
float yInc = dy/steps; \
float stepRcp = 1.0f/steps; \
\
float zInc = (v1->homogeneous[2] - v0->homogeneous[2])*stepRcp; \
float rInc = (v1->color[0] - v0->color[0])*stepRcp; \
float gInc = (v1->color[1] - v0->color[1])*stepRcp; \
float bInc = (v1->color[2] - v0->color[2])*stepRcp; \
float aInc = (v1->color[3] - v0->color[3])*stepRcp; \
\
/* Initializing the interpolation starting values */ \
float x = x0 + xInc*substep; \
float y = y0 + yInc*substep; \
float z = v0->homogeneous[2] + zInc*substep; \
float r = v0->color[0] + rInc*substep; \
float g = v0->color[1] + gInc*substep; \
float b = v0->color[2] + bInc*substep; \
float a = v0->color[3] + aInc*substep; \
\
const int fbWidth = RLSW.framebuffer.width; \
sw_pixel_t *pixels = RLSW.framebuffer.pixels; \
\
int numPixels = (int)(steps - substep) + 1; \
\
for (int i = 0; i < numPixels; i++) \
{ \
/* REVIEW: May require reviewing projection details */ \
int px = (int)(x - 0.5f); \
int py = (int)(y - 0.5f); \
\
sw_pixel_t *ptr = pixels + py*fbWidth + px; \
\
if (ENABLE_DEPTH_TEST) \
{ \
float depth = sw_framebuffer_read_depth(ptr); \
if (z > depth) goto discard; \
} \
\
sw_framebuffer_write_depth(ptr, z); \
\
float color[4] = {r, g, b, a}; \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
sw_framebuffer_read_color(dstColor, ptr); \
sw_blend_colors(dstColor, color); \
sw_framebuffer_write_color(ptr, dstColor); \
} \
else sw_framebuffer_write_color(ptr, color); \
\
discard: \
x += xInc; y += yInc; z += zInc; \
r += rInc; g += gInc; b += bInc; a += aInc; \
} \
}
#define DEFINE_LINE_THICK_RASTER(FUNC_NAME, RASTER_FUNC) \
void FUNC_NAME(const sw_vertex_t *v1, const sw_vertex_t *v2) \
{ \
sw_vertex_t tv1, tv2; \
\
int x1 = (int)v1->screen[0]; \
int y1 = (int)v1->screen[1]; \
int x2 = (int)v2->screen[0]; \
int y2 = (int)v2->screen[1]; \
\
int dx = x2 - x1; \
int dy = y2 - y1; \
\
RASTER_FUNC(v1, v2); \
\
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++) \
{ \
tv1 = *v1, tv2 = *v2; \
tv1.screen[1] -= i; \
tv2.screen[1] -= i; \
RASTER_FUNC(&tv1, &tv2); \
tv1 = *v1, tv2 = *v2; \
tv1.screen[1] += i; \
tv2.screen[1] += i; \
RASTER_FUNC(&tv1, &tv2); \
} \
} \
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++) \
{ \
tv1 = *v1, tv2 = *v2; \
tv1.screen[0] -= i; \
tv2.screen[0] -= i; \
RASTER_FUNC(&tv1, &tv2); \
tv1 = *v1, tv2 = *v2; \
tv1.screen[0] += i; \
tv2.screen[0] += i; \
RASTER_FUNC(&tv1, &tv2); \
} \
} \
}
DEFINE_LINE_RASTER(sw_line_raster, 0, 0)
DEFINE_LINE_RASTER(sw_line_raster_DEPTH, 1, 0)
DEFINE_LINE_RASTER(sw_line_raster_BLEND, 0, 1)
DEFINE_LINE_RASTER(sw_line_raster_DEPTH_BLEND, 1, 1)
DEFINE_LINE_THICK_RASTER(sw_line_thick_raster, sw_line_raster)
DEFINE_LINE_THICK_RASTER(sw_line_thick_raster_DEPTH, sw_line_raster_DEPTH)
DEFINE_LINE_THICK_RASTER(sw_line_thick_raster_BLEND, sw_line_raster_BLEND)
DEFINE_LINE_THICK_RASTER(sw_line_thick_raster_DEPTH_BLEND, sw_line_raster_DEPTH_BLEND)
static inline void sw_line_render(sw_vertex_t *vertices)
{
if (!sw_line_clip_and_project(&vertices[0], &vertices[1])) return;
if (RLSW.lineWidth >= 2.0f)
{
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_line_thick_raster_DEPTH_BLEND(&vertices[0], &vertices[1]);
else if (SW_STATE_CHECK(SW_STATE_BLEND)) sw_line_thick_raster_BLEND(&vertices[0], &vertices[1]);
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) sw_line_thick_raster_DEPTH(&vertices[0], &vertices[1]);
else sw_line_thick_raster(&vertices[0], &vertices[1]);
}
else
{
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_line_raster_DEPTH_BLEND(&vertices[0], &vertices[1]);
else if (SW_STATE_CHECK(SW_STATE_BLEND)) sw_line_raster_BLEND(&vertices[0], &vertices[1]);
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) sw_line_raster_DEPTH(&vertices[0], &vertices[1]);
else sw_line_raster(&vertices[0], &vertices[1]);
}
}
//-------------------------------------------------------------------------------------------
// Point rendering logic
//-------------------------------------------------------------------------------------------
static inline bool sw_point_clip_and_project(sw_vertex_t *v)
{
if (v->homogeneous[3] != 1.0f)
{
for (int_fast8_t i = 0; i < 3; i++)
{
if ((v->homogeneous[i] < -v->homogeneous[3]) || (v->homogeneous[i] > v->homogeneous[3])) return false;
}
v->homogeneous[3] = 1.0f/v->homogeneous[3];
v->homogeneous[0] *= v->homogeneous[3];
v->homogeneous[1] *= v->homogeneous[3];
v->homogeneous[2] *= v->homogeneous[3];
}
sw_project_ndc_to_screen(v->screen, v->homogeneous);
const int *min = NULL, *max = NULL;
if (RLSW.stateFlags & SW_STATE_SCISSOR_TEST)
{
min = RLSW.scMin;
max = RLSW.scMax;
}
else
{
min = RLSW.vpMin;
max = RLSW.vpMax;
}
bool insideX = (v->screen[0] - RLSW.pointRadius < max[0]) && (v->screen[0] + RLSW.pointRadius > min[0]);
bool insideY = (v->screen[1] - RLSW.pointRadius < max[1]) && (v->screen[1] + RLSW.pointRadius > min[1]);
return (insideX && insideY);
}
#define DEFINE_POINT_RASTER(FUNC_NAME, ENABLE_DEPTH_TEST, ENABLE_COLOR_BLEND, CHECK_BOUNDS) \
static inline void FUNC_NAME(int x, int y, float z, const float color[4]) \
{ \
if (CHECK_BOUNDS == 1) \
{ \
if ((x < RLSW.vpMin[0]) || (x >= RLSW.vpMax[0])) return; \
if ((y < RLSW.vpMin[1]) || (y >= RLSW.vpMax[1])) return; \
} \
else if (CHECK_BOUNDS == SW_SCISSOR_TEST) \
{ \
if ((x < RLSW.scMin[0]) || (x >= RLSW.scMax[0])) return; \
if ((y < RLSW.scMin[1]) || (y >= RLSW.scMax[1])) return; \
} \
\
int offset = y*RLSW.framebuffer.width + x; \
sw_pixel_t *ptr = RLSW.framebuffer.pixels + offset; \
\
if (ENABLE_DEPTH_TEST) \
{ \
float depth = sw_framebuffer_read_depth(ptr); \
if (z > depth) return; \
} \
\
sw_framebuffer_write_depth(ptr, z); \
\
if (ENABLE_COLOR_BLEND) \
{ \
float dstColor[4]; \
sw_framebuffer_read_color(dstColor, ptr); \
sw_blend_colors(dstColor, color); \
sw_framebuffer_write_color(ptr, dstColor); \
} \
else sw_framebuffer_write_color(ptr, color); \
}
#define DEFINE_POINT_THICK_RASTER(FUNC_NAME, RASTER_FUNC) \
static inline void FUNC_NAME(sw_vertex_t *v) \
{ \
int cx = v->screen[0]; \
int cy = v->screen[1]; \
float cz = v->homogeneous[2]; \
int radius = RLSW.pointRadius; \
const float *color = v->color; \
\
int x = 0; \
int y = radius; \
int d = 3 - 2*radius; \
\
while (x <= y) \
{ \
for (int i = -x; i <= x; i++) \
{ \
RASTER_FUNC(cx + i, cy + y, cz, color); \
RASTER_FUNC(cx + i, cy - y, cz, color); \
} \
for (int i = -y; i <= y; i++) \
{ \
RASTER_FUNC(cx + i, cy + x, cz, color); \
RASTER_FUNC(cx + i, cy - x, cz, color); \
} \
if (d > 0) \
{ \
y--; \
d = d + 4*(x - y) + 10; \
} \
else d = d + 4*x + 6; \
x++; \
} \
}
DEFINE_POINT_RASTER(sw_point_raster, 0, 0, 0)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH, 1, 0, 0)
DEFINE_POINT_RASTER(sw_point_raster_BLEND, 0, 1, 0)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH_BLEND, 1, 1, 0)
DEFINE_POINT_RASTER(sw_point_raster_CHECK, 0, 0, 1)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH_CHECK, 1, 0, 1)
DEFINE_POINT_RASTER(sw_point_raster_BLEND_CHECK, 0, 1, 1)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH_BLEND_CHECK, 1, 1, 1)
DEFINE_POINT_RASTER(sw_point_raster_CHECK_SCISSOR, 0, 0, SW_SCISSOR_TEST)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH_CHECK_SCISSOR, 1, 0, SW_SCISSOR_TEST)
DEFINE_POINT_RASTER(sw_point_raster_BLEND_CHECK_SCISSOR, 0, 1, SW_SCISSOR_TEST)
DEFINE_POINT_RASTER(sw_point_raster_DEPTH_BLEND_CHECK_SCISSOR, 1, 1, SW_SCISSOR_TEST)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster, sw_point_raster_CHECK)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_DEPTH, sw_point_raster_DEPTH_CHECK)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_BLEND, sw_point_raster_BLEND_CHECK)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_DEPTH_BLEND, sw_point_raster_DEPTH_BLEND_CHECK)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_SCISSOR, sw_point_raster_CHECK_SCISSOR)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_DEPTH_SCISSOR, sw_point_raster_DEPTH_CHECK_SCISSOR)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_BLEND_SCISSOR, sw_point_raster_BLEND_CHECK_SCISSOR)
DEFINE_POINT_THICK_RASTER(sw_point_thick_raster_DEPTH_BLEND_SCISSOR, sw_point_raster_DEPTH_BLEND_CHECK_SCISSOR)
static inline void sw_point_render(sw_vertex_t *v)
{
if (!sw_point_clip_and_project(v)) return;
if (RLSW.pointRadius >= 1.0f)
{
if (SW_STATE_CHECK(SW_STATE_SCISSOR_TEST))
{
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_point_thick_raster_DEPTH_BLEND_SCISSOR(v);
else if (SW_STATE_CHECK(SW_STATE_BLEND)) sw_point_thick_raster_BLEND_SCISSOR(v);
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) sw_point_thick_raster_DEPTH_SCISSOR(v);
else sw_point_thick_raster_SCISSOR(v);
}
else
{
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_point_thick_raster_DEPTH_BLEND(v);
else if (SW_STATE_CHECK(SW_STATE_BLEND)) sw_point_thick_raster_BLEND(v);
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) sw_point_thick_raster_DEPTH(v);
else sw_point_thick_raster(v);
}
}
else
{
if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST | SW_STATE_BLEND)) sw_point_raster_DEPTH_BLEND(v->screen[0], v->screen[1], v->homogeneous[2], v->color);
else if (SW_STATE_CHECK(SW_STATE_BLEND)) sw_point_raster_BLEND(v->screen[0], v->screen[1], v->homogeneous[2], v->color);
else if (SW_STATE_CHECK(SW_STATE_DEPTH_TEST)) sw_point_raster_DEPTH(v->screen[0], v->screen[1], v->homogeneous[2], v->color);
else sw_point_raster(v->screen[0], v->screen[1], v->homogeneous[2], v->color);
}
}
//-------------------------------------------------------------------------------------------
// Polygon modes rendering logic
//-------------------------------------------------------------------------------------------
static inline void sw_poly_point_render(void)
{
for (int i = 0; i < RLSW.vertexCounter; i++) sw_point_render(&RLSW.vertexBuffer[i]);
}
static inline void sw_poly_line_render(void)
{
const sw_vertex_t *vertices = RLSW.vertexBuffer;
int cm1 = RLSW.vertexCounter - 1;
for (int i = 0; i < cm1; i++)
{
sw_vertex_t verts[2] = { vertices[i], vertices[i + 1] };
sw_line_render(verts);
}
sw_vertex_t verts[2] = { vertices[cm1], vertices[0] };
sw_line_render(verts);
}
static inline void sw_poly_fill_render(void)
{
switch (RLSW.drawMode)
{
case SW_POINTS: sw_point_render(&RLSW.vertexBuffer[0]); break;
case SW_LINES: sw_line_render(RLSW.vertexBuffer); break;
case SW_TRIANGLES: sw_triangle_render(); break;
case SW_QUADS: sw_quad_render(); break;
}
}
//-------------------------------------------------------------------------------------------
// Immediate rendering logic
//-------------------------------------------------------------------------------------------
void sw_immediate_push_vertex(const float position[4], const float color[4], const float texcoord[2])
{
// Copy the attributes in the current vertex
sw_vertex_t *vertex = &RLSW.vertexBuffer[RLSW.vertexCounter++];
for (int i = 0; i < 4; i++)
{
vertex->position[i] = position[i];
if (i < 2) vertex->texcoord[i] = texcoord[i];
vertex->color[i] = color[i];
}
// Calculate homogeneous coordinates
const float *m = RLSW.matMVP, *v = vertex->position;
vertex->homogeneous[0] = m[0]*v[0] + m[4]*v[1] + m[8]*v[2] + m[12]*v[3];
vertex->homogeneous[1] = m[1]*v[0] + m[5]*v[1] + m[9]*v[2] + m[13]*v[3];
vertex->homogeneous[2] = m[2]*v[0] + m[6]*v[1] + m[10]*v[2] + m[14]*v[3];
vertex->homogeneous[3] = m[3]*v[0] + m[7]*v[1] + m[11]*v[2] + m[15]*v[3];
// Immediate rendering of the primitive if the required number is reached
if (RLSW.vertexCounter == RLSW.reqVertices)
{
switch (RLSW.polyMode)
{
case SW_FILL: sw_poly_fill_render(); break;
case SW_LINE: sw_poly_line_render(); break;
case SW_POINT: sw_poly_point_render(); break;
default: break;
}
RLSW.vertexCounter = 0;
}
}
//-------------------------------------------------------------------------------------------
// Validity check helper functions
//-------------------------------------------------------------------------------------------
static inline bool sw_is_texture_valid(uint32_t id)
{
bool valid = true;
if (id == 0) valid = false;
else if (id >= SW_MAX_TEXTURES) valid = false;
else if (RLSW.loadedTextures[id].pixels == NULL) valid = false;
return true;
}
static inline bool sw_is_texture_filter_valid(int filter)
{
return ((filter == SW_NEAREST) || (filter == SW_LINEAR));
}
static inline bool sw_is_texture_wrap_valid(int wrap)
{
return ((wrap == SW_REPEAT) || (wrap == SW_CLAMP));
}
static inline 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 inline 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 inline bool sw_is_face_valid(int face)
{
return (face == SW_FRONT || face == SW_BACK);
}
static inline bool sw_is_blend_src_factor_valid(int blend)
{
bool result = false;
switch (blend)
{
case SW_ZERO:
case SW_ONE:
case SW_SRC_COLOR:
case SW_ONE_MINUS_SRC_COLOR:
case SW_SRC_ALPHA:
case SW_ONE_MINUS_SRC_ALPHA:
case SW_DST_ALPHA:
case SW_ONE_MINUS_DST_ALPHA:
case SW_DST_COLOR:
case SW_ONE_MINUS_DST_COLOR:
case SW_SRC_ALPHA_SATURATE: result = true; break;
default: break;
}
return result;
}
static inline bool sw_is_blend_dst_factor_valid(int blend)
{
bool result = false;
switch (blend)
{
case SW_ZERO:
case SW_ONE:
case SW_SRC_COLOR:
case SW_ONE_MINUS_SRC_COLOR:
case SW_SRC_ALPHA:
case SW_ONE_MINUS_SRC_ALPHA:
case SW_DST_ALPHA:
case SW_ONE_MINUS_DST_ALPHA:
case SW_DST_COLOR:
case SW_ONE_MINUS_DST_COLOR: result = true; break;
default: break;
}
return result;
}
//-------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
bool swInit(int w, int h)
{
if (!sw_framebuffer_load(w, h)) { swClose(); return false; }
swViewport(0, 0, w, h);
swScissor(0, 0, w, h);
RLSW.loadedTextures = (sw_texture_t *)SW_MALLOC(SW_MAX_TEXTURES*sizeof(sw_texture_t));
if (RLSW.loadedTextures == NULL) { swClose(); return false; }
RLSW.freeTextureIds = (uint32_t *)SW_MALLOC(SW_MAX_TEXTURES*sizeof(uint32_t));
if (RLSW.loadedTextures == NULL) { swClose(); return false; }
const float clearColor[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
sw_framebuffer_write_color(&RLSW.clearValue, clearColor);
sw_framebuffer_write_depth(&RLSW.clearValue, 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.current.texcoord[0] = 0.0f;
RLSW.current.texcoord[1] = 0.0f;
RLSW.current.color[0] = 1.0f;
RLSW.current.color[1] = 1.0f;
RLSW.current.color[2] = 1.0f;
RLSW.current.color[3] = 1.0f;
RLSW.srcFactor = SW_SRC_ALPHA;
RLSW.dstFactor = SW_ONE_MINUS_SRC_ALPHA;
RLSW.srcFactorFunc = sw_factor_src_alpha;
RLSW.dstFactorFunc = sw_factor_one_minus_src_alpha;
RLSW.polyMode = SW_FILL;
RLSW.cullFace = SW_BACK;
static uint32_t defaultTex[3*2*2] = {
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
RLSW.loadedTextures[0].pixels = (uint8_t*)defaultTex;
RLSW.loadedTextures[0].width = 2;
RLSW.loadedTextures[0].height = 2;
RLSW.loadedTextures[0].wMinus1 = 1;
RLSW.loadedTextures[0].hMinus1 = 1;
RLSW.loadedTextures[0].minFilter = SW_NEAREST;
RLSW.loadedTextures[0].magFilter = SW_NEAREST;
RLSW.loadedTextures[0].sWrap = SW_REPEAT;
RLSW.loadedTextures[0].tWrap = SW_REPEAT;
RLSW.loadedTextures[0].tx = 0.5f;
RLSW.loadedTextures[0].ty = 0.5f;
RLSW.loadedTextureCount = 1;
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)
{
// NOTE: Starts at texture 1, texture 0 does not have to be freed
for (int i = 1; i < RLSW.loadedTextureCount; i++)
{
if (sw_is_texture_valid(i))
{
SW_FREE(RLSW.loadedTextures[i].pixels);
}
}
SW_FREE(RLSW.framebuffer.pixels);
SW_FREE(RLSW.loadedTextures);
SW_FREE(RLSW.freeTextureIds);
RLSW = SW_CURLY_INIT(sw_context_t) { 0 };
}
bool swResizeFramebuffer(int w, int h)
{
return sw_framebuffer_resize(w, h);
}
void swCopyFramebuffer(int x, int y, int w, int h, SWformat format, SWtype type, void *pixels)
{
sw_pixelformat_t pFormat = (sw_pixelformat_t)sw_get_pixel_format(format, type);
if (w <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (h <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (w > RLSW.framebuffer.width) w = RLSW.framebuffer.width;
if (h > RLSW.framebuffer.height) h = RLSW.framebuffer.height;
x = sw_clampi(x, 0, w);
y = sw_clampi(y, 0, h);
if ((x >= w) || (y >= h)) return;
if ((x == 0) && (y == 0) && (w == RLSW.framebuffer.width) && (h == RLSW.framebuffer.height))
{
#if SW_COLOR_BUFFER_BITS == 32
if (pFormat == SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8)
{
sw_framebuffer_copy_fast(pixels);
return;
}
#elif SW_COLOR_BUFFER_BITS == 16
if (pFormat == SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5)
{
sw_framebuffer_copy_fast(pixels);
return;
}
#endif
}
switch (pFormat)
{
case SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE: sw_framebuffer_copy_to_GRAYALPHA(x, y, w, h, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA: sw_framebuffer_copy_to_GRAYALPHA(x, y, w, h, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5: sw_framebuffer_copy_to_R5G6B5(x, y, w, h, (uint16_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8: sw_framebuffer_copy_to_R8G8B8(x, y, w, h, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1: sw_framebuffer_copy_to_R5G5B5A1(x, y, w, h, (uint16_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4: sw_framebuffer_copy_to_R4G4B4A4(x, y, w, h, (uint16_t *)pixels); break;
//case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8: sw_framebuffer_copy_to_R8G8B8A8(x, y, w, h, (uint8_t *)pixels); break;
// Below: not implemented
case SW_PIXELFORMAT_UNCOMPRESSED_R32:
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32:
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32:
case SW_PIXELFORMAT_UNCOMPRESSED_R16:
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16:
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16:
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swBlitFramebuffer(int xDst, int yDst, int wDst, int hDst, int xSrc, int ySrc, int wSrc, int hSrc, SWformat format, SWtype type, void *pixels)
{
sw_pixelformat_t pFormat = (sw_pixelformat_t)sw_get_pixel_format(format, type);
if (wSrc <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (hSrc <= 0) { RLSW.errCode = SW_INVALID_VALUE; return; }
if (wSrc > RLSW.framebuffer.width) wSrc = RLSW.framebuffer.width;
if (hSrc > RLSW.framebuffer.height) hSrc = RLSW.framebuffer.height;
xSrc = sw_clampi(xSrc, 0, wSrc);
ySrc = sw_clampi(ySrc, 0, hSrc);
// Check if the sizes are identical after clamping the source to avoid unexpected issues
// REVIEW: This repeats the operations if true, so we could make a copy function without these checks
if (xDst == xSrc && yDst == ySrc && wDst == wSrc && hDst == hSrc)
{
swCopyFramebuffer(xSrc, ySrc, wSrc, hSrc, format, type, pixels);
}
switch (pFormat)
{
case SW_PIXELFORMAT_UNCOMPRESSED_GRAYSCALE: sw_framebuffer_blit_to_GRAYALPHA(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_GRAY_ALPHA: sw_framebuffer_blit_to_GRAYALPHA(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G6B5: sw_framebuffer_blit_to_R5G6B5(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint16_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8: sw_framebuffer_blit_to_R8G8B8(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint8_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R5G5B5A1: sw_framebuffer_blit_to_R5G5B5A1(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint16_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R4G4B4A4: sw_framebuffer_blit_to_R4G4B4A4(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint16_t *)pixels); break;
case SW_PIXELFORMAT_UNCOMPRESSED_R8G8B8A8: sw_framebuffer_blit_to_R8G8B8A8(xDst, yDst, wDst, hDst, xSrc, ySrc, wSrc, hSrc, (uint8_t *)pixels); break;
// Below: not implemented
case SW_PIXELFORMAT_UNCOMPRESSED_R32:
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32:
case SW_PIXELFORMAT_UNCOMPRESSED_R32G32B32A32:
case SW_PIXELFORMAT_UNCOMPRESSED_R16:
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16:
case SW_PIXELFORMAT_UNCOMPRESSED_R16G16B16A16:
default:
RLSW.errCode = SW_INVALID_ENUM;
break;
}
}
void swEnable(SWstate state)
{
switch (state)
{
case SW_SCISSOR_TEST: RLSW.stateFlags |= SW_STATE_SCISSOR_TEST; break;
case SW_TEXTURE_2D: RLSW.stateFlags |= SW_STATE_TEXTURE_2D; break;
case SW_DEPTH_TEST: RLSW.stateFlags |= SW_STATE_DEPTH_TEST; break;
case SW_CULL_FACE: RLSW.stateFlags |= SW_STATE_CULL_FACE; break;
case SW_BLEND: RLSW.stateFlags |= SW_STATE_BLEND; break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swDisable(SWstate state)
{
switch (state)
{
case SW_SCISSOR_TEST: RLSW.stateFlags &= ~SW_STATE_SCISSOR_TEST; break;
case SW_TEXTURE_2D: RLSW.stateFlags &= ~SW_STATE_TEXTURE_2D; break;
case SW_DEPTH_TEST: RLSW.stateFlags &= ~SW_STATE_DEPTH_TEST; break;
case SW_CULL_FACE: RLSW.stateFlags &= ~SW_STATE_CULL_FACE; break;
case SW_BLEND: RLSW.stateFlags &= ~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;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swGetFloatv(SWget name, float *v)
{
switch (name)
{
case SW_COLOR_CLEAR_VALUE:
{
sw_framebuffer_read_color(v, &RLSW.clearValue);
} break;
case SW_DEPTH_CLEAR_VALUE:
{
v[0] = sw_framebuffer_read_depth(&RLSW.clearValue);
} break;
case SW_CURRENT_COLOR:
{
v[0] = RLSW.vertexBuffer[RLSW.vertexCounter - 1].color[0];
v[1] = RLSW.vertexBuffer[RLSW.vertexCounter - 1].color[1];
v[2] = RLSW.vertexBuffer[RLSW.vertexCounter - 1].color[2];
v[3] = RLSW.vertexBuffer[RLSW.vertexCounter - 1].color[3];
} break;
case SW_CURRENT_TEXTURE_COORDS:
{
v[0] = RLSW.vertexBuffer[RLSW.vertexCounter - 1].texcoord[0];
v[1] = RLSW.vertexBuffer[RLSW.vertexCounter - 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 Header"; break;
case SW_RENDERER: result = "RLSW Software Renderer"; break;
case SW_VERSION: result = "RLSW 1.0"; break;
case SW_EXTENSIONS: result = "None"; 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];
RLSW.vpMin[0] = sw_clampi(x, 0, RLSW.framebuffer.width - 1);
RLSW.vpMin[1] = sw_clampi(y, 0, RLSW.framebuffer.height - 1);
RLSW.vpMax[0] = sw_clampi(x + width, 0, RLSW.framebuffer.width - 1);
RLSW.vpMax[1] = sw_clampi(y + height, 0, RLSW.framebuffer.height - 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] = sw_clampi(x, 0, RLSW.framebuffer.width - 1);
RLSW.scMin[1] = sw_clampi(y, 0, RLSW.framebuffer.height - 1);
RLSW.scMax[0] = sw_clampi(x + width, 0, RLSW.framebuffer.width - 1);
RLSW.scMax[1] = sw_clampi(y + height, 0, RLSW.framebuffer.height - 1);
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.scClipMax[1] = 1.0f - (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]);
RLSW.scClipMin[1] = 1.0f - (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]);
}
void swClearColor(float r, float g, float b, float a)
{
float v[4] = { r, g, b, a };
sw_framebuffer_write_color(&RLSW.clearValue, v);
}
void swClearDepth(float depth)
{
sw_framebuffer_write_depth(&RLSW.clearValue, depth);
}
void swClear(uint32_t bitmask)
{
int size = RLSW.framebuffer.width*RLSW.framebuffer.height;
if ((bitmask & (SW_COLOR_BUFFER_BIT | SW_DEPTH_BUFFER_BIT)) == (SW_COLOR_BUFFER_BIT | SW_DEPTH_BUFFER_BIT))
{
sw_framebuffer_fill(RLSW.framebuffer.pixels, size, RLSW.clearValue);
}
else if (bitmask & (SW_COLOR_BUFFER_BIT))
{
sw_framebuffer_fill_color(RLSW.framebuffer.pixels, size, RLSW.clearValue.color);
}
else if (bitmask & SW_DEPTH_BUFFER_BIT)
{
sw_framebuffer_fill_depth(RLSW.framebuffer.pixels, size, RLSW.clearValue.depth);
}
}
void swBlendFunc(SWfactor sfactor, SWfactor dfactor)
{
if (!sw_is_blend_src_factor_valid(sfactor) ||
!sw_is_blend_dst_factor_valid(dfactor))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
RLSW.srcFactor = sfactor;
RLSW.dstFactor = dfactor;
switch (sfactor)
{
case SW_ZERO: RLSW.srcFactorFunc = sw_factor_zero; break;
case SW_ONE: RLSW.srcFactorFunc = sw_factor_one; break;
case SW_SRC_COLOR: RLSW.srcFactorFunc = sw_factor_src_color; break;
case SW_ONE_MINUS_SRC_COLOR: RLSW.srcFactorFunc = sw_factor_one_minus_src_color; break;
case SW_SRC_ALPHA: RLSW.srcFactorFunc = sw_factor_src_alpha; break;
case SW_ONE_MINUS_SRC_ALPHA: RLSW.srcFactorFunc = sw_factor_one_minus_src_alpha; break;
case SW_DST_ALPHA: RLSW.srcFactorFunc = sw_factor_dst_alpha; break;
case SW_ONE_MINUS_DST_ALPHA: RLSW.srcFactorFunc = sw_factor_one_minus_dst_alpha; break;
case SW_DST_COLOR: RLSW.srcFactorFunc = sw_factor_dst_color; break;
case SW_ONE_MINUS_DST_COLOR: RLSW.srcFactorFunc = sw_factor_one_minus_dst_color; break;
case SW_SRC_ALPHA_SATURATE: RLSW.srcFactorFunc = sw_factor_src_alpha_saturate; break;
default: break;
}
switch (dfactor)
{
case SW_ZERO: RLSW.dstFactorFunc = sw_factor_zero; break;
case SW_ONE: RLSW.dstFactorFunc = sw_factor_one; break;
case SW_SRC_COLOR: RLSW.dstFactorFunc = sw_factor_src_color; break;
case SW_ONE_MINUS_SRC_COLOR: RLSW.dstFactorFunc = sw_factor_one_minus_src_color; break;
case SW_SRC_ALPHA: RLSW.dstFactorFunc = sw_factor_src_alpha; break;
case SW_ONE_MINUS_SRC_ALPHA: RLSW.dstFactorFunc = sw_factor_one_minus_src_alpha; break;
case SW_DST_ALPHA: RLSW.dstFactorFunc = sw_factor_dst_alpha; break;
case SW_ONE_MINUS_DST_ALPHA: RLSW.dstFactorFunc = sw_factor_one_minus_dst_alpha; break;
case SW_DST_COLOR: RLSW.dstFactorFunc = sw_factor_dst_color; break;
case SW_ONE_MINUS_DST_COLOR: RLSW.dstFactorFunc = sw_factor_one_minus_dst_color; break;
case SW_SRC_ALPHA_SATURATE: break;
default: break;
}
}
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 >= SW_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 >= SW_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 >= SW_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];
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];
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];
} 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;
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;
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;
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;
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;
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 the draw mode is valid
if (!sw_is_draw_mode_valid(mode))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
// 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]);
RLSW.isDirtyMVP = false;
}
// Obtain the number of vertices needed for this primitive
switch (mode)
{
case SW_POINTS: RLSW.reqVertices = 1; break;
case SW_LINES: RLSW.reqVertices = 2; break;
case SW_TRIANGLES: RLSW.reqVertices = 3; break;
case SW_QUADS: RLSW.reqVertices = 4; break;
}
// Initialize required values
RLSW.vertexCounter = 0;
RLSW.drawMode = mode;
}
void swEnd(void)
{
RLSW.drawMode = (SWdraw)0;
}
void swVertex2i(int x, int y)
{
const float v[4] = { (float)x, (float)y, 0.0f, 1.0f };
sw_immediate_push_vertex(v, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex2f(float x, float y)
{
const float v[4] = { x, y, 0.0f, 1.0f };
sw_immediate_push_vertex(v, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex2fv(const float *v)
{
const float v4[4] = { v[0], v[1], 0.0f, 1.0f };
sw_immediate_push_vertex(v4, RLSW.current.color, RLSW.current.texcoord);
}
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, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex3f(float x, float y, float z)
{
const float v[4] = { x, y, z, 1.0f };
sw_immediate_push_vertex(v, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex3fv(const float *v)
{
const float v4[4] = { v[0], v[1], v[2], 1.0f };
sw_immediate_push_vertex(v4, RLSW.current.color, RLSW.current.texcoord);
}
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, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex4f(float x, float y, float z, float w)
{
const float v[4] = { x, y, z, w };
sw_immediate_push_vertex(v, RLSW.current.color, RLSW.current.texcoord);
}
void swVertex4fv(const float *v)
{
sw_immediate_push_vertex(v, RLSW.current.color, RLSW.current.texcoord);
}
void swColor3ub(uint8_t r, uint8_t g, uint8_t b)
{
float cv[4];
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;
swColor4fv(cv);
}
void swColor3ubv(const uint8_t *v)
{
float cv[4];
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;
swColor4fv(cv);
}
void swColor3f(float r, float g, float b)
{
float cv[4];
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor3fv(const float *v)
{
float cv[4];
cv[0] = v[0];
cv[1] = v[1];
cv[2] = v[2];
cv[3] = 1.0f;
swColor4fv(cv);
}
void swColor4ub(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
{
float cv[4];
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;
swColor4fv(cv);
}
void swColor4ubv(const uint8_t *v)
{
float cv[4];
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;
swColor4fv(cv);
}
void swColor4f(float r, float g, float b, float a)
{
float cv[4];
cv[0] = r;
cv[1] = g;
cv[2] = b;
cv[3] = a;
swColor4fv(cv);
}
void swColor4fv(const float *v)
{
for (int i = 0; i < 4; i++) RLSW.current.color[i] = v[i];
}
void swTexCoord2f(float u, float v)
{
const float *m = RLSW.stackTexture[RLSW.stackTextureCounter - 1];
RLSW.current.texcoord[0] = m[0]*u + m[4]*v + m[12];
RLSW.current.texcoord[1] = m[1]*u + m[5]*v + m[13];
}
void swTexCoord2fv(const float *v)
{
const float *m = RLSW.stackTexture[RLSW.stackTextureCounter - 1];
RLSW.current.texcoord[0] = m[0]*v[0] + m[4]*v[1] + m[12];
RLSW.current.texcoord[1] = m[1]*v[0] + m[5]*v[1] + m[13];
}
void swBindArray(SWarray type, void *buffer)
{
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 (RLSW.array.positions == 0)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
swBegin(mode);
{
const float *texMatrix = RLSW.stackTexture[RLSW.stackTextureCounter - 1];
const float *defaultTexcoord = RLSW.current.texcoord;
const float *defaultColor = RLSW.current.color;
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++)
{
float u, v;
if (texcoords)
{
int idx = 2*i;
u = texcoords[idx];
v = texcoords[idx + 1];
}
else
{
u = defaultTexcoord[0];
v = defaultTexcoord[1];
}
float texcoord[2];
texcoord[0] = texMatrix[0]*u + texMatrix[4]*v + texMatrix[12];
texcoord[1] = texMatrix[1]*u + texMatrix[5]*v + texMatrix[13];
float color[4] = {
defaultColor[0],
defaultColor[1],
defaultColor[2],
defaultColor[3]
};
if (colors)
{
int idx = 4*i;
color[0] *= (float)colors[idx]*SW_INV_255;
color[1] *= (float)colors[idx + 1]*SW_INV_255;
color[2] *= (float)colors[idx + 2]*SW_INV_255;
color[3] *= (float)colors[idx + 3]*SW_INV_255;
}
int idx = 3*i;
float position[4] = {
positions[idx],
positions[idx + 1],
positions[idx + 2],
1.0f
};
sw_immediate_push_vertex(position, color, texcoord);
}
}
swEnd();
}
void swDrawElements(SWdraw mode, int count, int type, const void *indices)
{
if (RLSW.array.positions == 0)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
if (count < 0)
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
const uint8_t *indicesUb = NULL;
const uint16_t *indicesUs = NULL;
const uint32_t *indicesUi = NULL;
switch (type)
{
case SW_UNSIGNED_BYTE:
indicesUb = (const uint8_t *)indices;
break;
case SW_UNSIGNED_SHORT:
indicesUs = (const uint16_t *)indices;
break;
case SW_UNSIGNED_INT:
indicesUi = (const uint32_t *)indices;
break;
default:
RLSW.errCode = SW_INVALID_ENUM;
return;
}
swBegin(mode);
{
const float *texMatrix = RLSW.stackTexture[RLSW.stackTextureCounter - 1];
const float *defaultTexcoord = RLSW.current.texcoord;
const float *defaultColor = RLSW.current.color;
const float *positions = RLSW.array.positions;
const float *texcoords = RLSW.array.texcoords;
const uint8_t *colors = RLSW.array.colors;
for (int i = 0; i < count; i++)
{
int index = indicesUb? indicesUb[i] :
(indicesUs? indicesUs[i] : indicesUi[i]);
float u, v;
if (texcoords)
{
int idx = 2*index;
u = texcoords[idx];
v = texcoords[idx + 1];
}
else
{
u = defaultTexcoord[0];
v = defaultTexcoord[1];
}
float texcoord[2];
texcoord[0] = texMatrix[0]*u + texMatrix[4]*v + texMatrix[12];
texcoord[1] = texMatrix[1]*u + texMatrix[5]*v + texMatrix[13];
float color[4] = {
defaultColor[0],
defaultColor[1],
defaultColor[2],
defaultColor[3]
};
if (colors)
{
int idx = 4*index;
color[0] *= (float)colors[idx]*SW_INV_255;
color[1] *= (float)colors[idx + 1]*SW_INV_255;
color[2] *= (float)colors[idx + 2]*SW_INV_255;
color[3] *= (float)colors[idx + 3]*SW_INV_255;
}
int idx = 3*index;
float position[4] = {
positions[idx],
positions[idx + 1],
positions[idx + 2],
1.0f
};
sw_immediate_push_vertex(position, color, texcoord);
}
}
swEnd();
}
void swGenTextures(int count, uint32_t *textures)
{
if ((count == 0) || (textures == NULL)) return;
for (int i = 0; i < count; i++)
{
if (RLSW.loadedTextureCount >= SW_MAX_TEXTURES)
{
RLSW.errCode = SW_STACK_OVERFLOW; // WARNING: Out of memory, not really stack overflow
return;
}
uint32_t id = 0;
if (RLSW.freeTextureIdCount > 0) id = RLSW.freeTextureIds[--RLSW.freeTextureIdCount];
else id = RLSW.loadedTextureCount++;
RLSW.loadedTextures[id] = RLSW.loadedTextures[0];
textures[i] = id;
}
}
void swDeleteTextures(int count, uint32_t *textures)
{
if ((count == 0) || (textures == NULL)) return;
for (int i = 0; i < count; i++)
{
if (!sw_is_texture_valid(textures[i]))
{
RLSW.errCode = SW_INVALID_VALUE;
continue;
}
SW_FREE(RLSW.loadedTextures[textures[i]].pixels);
RLSW.loadedTextures[textures[i]].pixels = NULL;
RLSW.freeTextureIds[RLSW.freeTextureIdCount++] = textures[i];
}
}
void swTexImage2D(int width, int height, SWformat format, SWtype type, const void *data)
{
uint32_t id = RLSW.currentTexture;
if (!sw_is_texture_valid(id))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
int pixelFormat = sw_get_pixel_format(format, type);
if (pixelFormat <= SW_PIXELFORMAT_UNKNOWN)
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
sw_texture_t *texture = &RLSW.loadedTextures[id];
int size = width*height;
texture->pixels = SW_MALLOC(4*size);
if (texture->pixels == NULL)
{
RLSW.errCode = SW_STACK_OVERFLOW; // WARNING: Out of memory...
return;
}
for (int i = 0; i < size; i++)
{
uint32_t *dst = &((uint32_t*)texture->pixels)[i];
sw_get_pixel((uint8_t*)dst, data, i, pixelFormat);
}
texture->width = width;
texture->height = height;
texture->wMinus1 = width - 1;
texture->hMinus1 = height - 1;
texture->tx = 1.0f/width;
texture->ty = 1.0f/height;
}
void swTexParameteri(int param, int value)
{
uint32_t id = RLSW.currentTexture;
if (!sw_is_texture_valid(id))
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
sw_texture_t *texture = &RLSW.loadedTextures[id];
switch (param)
{
case SW_TEXTURE_MIN_FILTER:
{
if (!sw_is_texture_filter_valid(value))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->minFilter = (SWfilter)value;
} break;
case SW_TEXTURE_MAG_FILTER:
{
if (!sw_is_texture_filter_valid(value))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->magFilter = (SWfilter)value;
} break;
case SW_TEXTURE_WRAP_S:
{
if (!sw_is_texture_wrap_valid(value))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->sWrap = (SWwrap)value;
} break;
case SW_TEXTURE_WRAP_T:
{
if (!sw_is_texture_wrap_valid(value))
{
RLSW.errCode = SW_INVALID_ENUM;
return;
}
texture->tWrap = (SWwrap)value;
} break;
default: RLSW.errCode = SW_INVALID_ENUM; break;
}
}
void swBindTexture(uint32_t id)
{
if (id >= SW_MAX_TEXTURES)
{
RLSW.errCode = SW_INVALID_VALUE;
return;
}
if (RLSW.loadedTextures[id].pixels == NULL)
{
RLSW.errCode = SW_INVALID_OPERATION;
return;
}
RLSW.currentTexture = id;
}
#endif // RLSW_IMPLEMENTATION