bindings-GLFW-3.2.1.0: glfw/src/nsgl_context.m
//========================================================================
// GLFW 3.2 OS X - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2009-2016 Camilla Berglund <elmindreda@glfw.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
static void makeContextCurrentNSGL(_GLFWwindow* window)
{
if (window)
[window->context.nsgl.object makeCurrentContext];
else
[NSOpenGLContext clearCurrentContext];
_glfwPlatformSetCurrentContext(window);
}
static void swapBuffersNSGL(_GLFWwindow* window)
{
// ARP appears to be unnecessary, but this is future-proof
[window->context.nsgl.object flushBuffer];
}
static void swapIntervalNSGL(int interval)
{
_GLFWwindow* window = _glfwPlatformGetCurrentContext();
GLint sync = interval;
[window->context.nsgl.object setValues:&sync
forParameter:NSOpenGLCPSwapInterval];
}
static int extensionSupportedNSGL(const char* extension)
{
// There are no NSGL extensions
return GLFW_FALSE;
}
static GLFWglproc getProcAddressNSGL(const char* procname)
{
CFStringRef symbolName = CFStringCreateWithCString(kCFAllocatorDefault,
procname,
kCFStringEncodingASCII);
GLFWglproc symbol = CFBundleGetFunctionPointerForName(_glfw.nsgl.framework,
symbolName);
CFRelease(symbolName);
return symbol;
}
// Destroy the OpenGL context
//
static void destroyContextNSGL(_GLFWwindow* window)
{
[window->context.nsgl.pixelFormat release];
window->context.nsgl.pixelFormat = nil;
[window->context.nsgl.object release];
window->context.nsgl.object = nil;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize OpenGL support
//
GLFWbool _glfwInitNSGL(void)
{
if (_glfw.nsgl.framework)
return GLFW_TRUE;
_glfw.nsgl.framework =
CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengl"));
if (_glfw.nsgl.framework == NULL)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"NSGL: Failed to locate OpenGL framework");
return GLFW_FALSE;
}
return GLFW_TRUE;
}
// Terminate OpenGL support
//
void _glfwTerminateNSGL(void)
{
}
// Create the OpenGL context
//
GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig)
{
unsigned int attributeCount = 0;
if (ctxconfig->client == GLFW_OPENGL_ES_API)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"NSGL: OpenGL ES is not available on OS X");
return GLFW_FALSE;
}
if (ctxconfig->major == 3 && ctxconfig->minor < 2)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"NSGL: The targeted version of OS X does not support OpenGL 3.0 or 3.1");
return GLFW_FALSE;
}
if (ctxconfig->major > 2)
{
if (!ctxconfig->forward)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"NSGL: The targeted version of OS X only supports forward-compatible contexts for OpenGL 3.2 and above");
return GLFW_FALSE;
}
if (ctxconfig->profile != GLFW_OPENGL_CORE_PROFILE)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"NSGL: The targeted version of OS X only supports core profile contexts for OpenGL 3.2 and above");
return GLFW_FALSE;
}
}
// Context robustness modes (GL_KHR_robustness) are not yet supported on
// OS X but are not a hard constraint, so ignore and continue
// Context release behaviors (GL_KHR_context_flush_control) are not yet
// supported on OS X but are not a hard constraint, so ignore and continue
#define ADD_ATTR(x) { attributes[attributeCount++] = x; }
#define ADD_ATTR2(x, y) { ADD_ATTR(x); ADD_ATTR(y); }
// Arbitrary array size here
NSOpenGLPixelFormatAttribute attributes[40];
ADD_ATTR(NSOpenGLPFAAccelerated);
ADD_ATTR(NSOpenGLPFAClosestPolicy);
#if MAC_OS_X_VERSION_MAX_ALLOWED >= 101000
if (ctxconfig->major >= 4)
{
ADD_ATTR2(NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion4_1Core);
}
else
#endif /*MAC_OS_X_VERSION_MAX_ALLOWED*/
if (ctxconfig->major >= 3)
{
ADD_ATTR2(NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core);
}
if (ctxconfig->major <= 2)
{
if (fbconfig->auxBuffers != GLFW_DONT_CARE)
ADD_ATTR2(NSOpenGLPFAAuxBuffers, fbconfig->auxBuffers);
if (fbconfig->accumRedBits != GLFW_DONT_CARE &&
fbconfig->accumGreenBits != GLFW_DONT_CARE &&
fbconfig->accumBlueBits != GLFW_DONT_CARE &&
fbconfig->accumAlphaBits != GLFW_DONT_CARE)
{
const int accumBits = fbconfig->accumRedBits +
fbconfig->accumGreenBits +
fbconfig->accumBlueBits +
fbconfig->accumAlphaBits;
ADD_ATTR2(NSOpenGLPFAAccumSize, accumBits);
}
}
if (fbconfig->redBits != GLFW_DONT_CARE &&
fbconfig->greenBits != GLFW_DONT_CARE &&
fbconfig->blueBits != GLFW_DONT_CARE)
{
int colorBits = fbconfig->redBits +
fbconfig->greenBits +
fbconfig->blueBits;
// OS X needs non-zero color size, so set reasonable values
if (colorBits == 0)
colorBits = 24;
else if (colorBits < 15)
colorBits = 15;
ADD_ATTR2(NSOpenGLPFAColorSize, colorBits);
}
if (fbconfig->alphaBits != GLFW_DONT_CARE)
ADD_ATTR2(NSOpenGLPFAAlphaSize, fbconfig->alphaBits);
if (fbconfig->depthBits != GLFW_DONT_CARE)
ADD_ATTR2(NSOpenGLPFADepthSize, fbconfig->depthBits);
if (fbconfig->stencilBits != GLFW_DONT_CARE)
ADD_ATTR2(NSOpenGLPFAStencilSize, fbconfig->stencilBits);
if (fbconfig->stereo)
ADD_ATTR(NSOpenGLPFAStereo);
if (fbconfig->doublebuffer)
ADD_ATTR(NSOpenGLPFADoubleBuffer);
if (fbconfig->samples != GLFW_DONT_CARE)
{
if (fbconfig->samples == 0)
{
ADD_ATTR2(NSOpenGLPFASampleBuffers, 0);
}
else
{
ADD_ATTR2(NSOpenGLPFASampleBuffers, 1);
ADD_ATTR2(NSOpenGLPFASamples, fbconfig->samples);
}
}
// NOTE: All NSOpenGLPixelFormats on the relevant cards support sRGB
// framebuffer, so there's no need (and no way) to request it
ADD_ATTR(0);
#undef ADD_ATTR
#undef ADD_ATTR2
window->context.nsgl.pixelFormat =
[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
if (window->context.nsgl.pixelFormat == nil)
{
_glfwInputError(GLFW_FORMAT_UNAVAILABLE,
"NSGL: Failed to find a suitable pixel format");
return GLFW_FALSE;
}
NSOpenGLContext* share = NULL;
if (ctxconfig->share)
share = ctxconfig->share->context.nsgl.object;
window->context.nsgl.object =
[[NSOpenGLContext alloc] initWithFormat:window->context.nsgl.pixelFormat
shareContext:share];
if (window->context.nsgl.object == nil)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"NSGL: Failed to create OpenGL context");
return GLFW_FALSE;
}
[window->context.nsgl.object setView:window->ns.view];
window->context.makeCurrent = makeContextCurrentNSGL;
window->context.swapBuffers = swapBuffersNSGL;
window->context.swapInterval = swapIntervalNSGL;
window->context.extensionSupported = extensionSupportedNSGL;
window->context.getProcAddress = getProcAddressNSGL;
window->context.destroy = destroyContextNSGL;
return GLFW_TRUE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI id glfwGetNSGLContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(nil);
if (window->context.client == GLFW_NO_API)
{
_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
return NULL;
}
return window->context.nsgl.object;
}