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SDL_cocoaopengl.m
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_cocoavideo.h"
/* NSOpenGL implementation of SDL OpenGL support */
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#if SDL_VIDEO_OPENGL_CGL
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#include <OpenGL/CGLTypes.h>
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#include <OpenGL/OpenGL.h>
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#include <OpenGL/CGLRenderers.h>
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#include "SDL_loadso.h"
#include "SDL_opengl.h"
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#define DEFAULT_OPENGL "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"
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int
Cocoa_GL_LoadLibrary(_THIS, const char *path)
{
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/* Load the OpenGL library */
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if (path == NULL) {
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path = SDL_getenv("SDL_OPENGL_LIBRARY");
}
if (path == NULL) {
path = DEFAULT_OPENGL;
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}
_this->gl_config.dll_handle = SDL_LoadObject(path);
if (!_this->gl_config.dll_handle) {
return -1;
}
SDL_strlcpy(_this->gl_config.driver_path, path,
SDL_arraysize(_this->gl_config.driver_path));
return 0;
}
void *
Cocoa_GL_GetProcAddress(_THIS, const char *proc)
{
return SDL_LoadFunction(_this->gl_config.dll_handle, proc);
}
void
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Cocoa_GL_UnloadLibrary(_THIS)
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SDL_UnloadObject(_this->gl_config.dll_handle);
_this->gl_config.dll_handle = NULL;
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}
SDL_GLContext
Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
{
NSAutoreleasePool *pool;
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SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
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SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
NSOpenGLPixelFormatAttribute attr[32];
NSOpenGLPixelFormat *fmt;
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NSOpenGLContext *context;
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int i = 0;
pool = [[NSAutoreleasePool alloc] init];
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#ifndef FULLSCREEN_TOGGLEABLE
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if (window->flags & SDL_WINDOW_FULLSCREEN) {
attr[i++] = NSOpenGLPFAFullScreen;
}
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attr[i++] = NSOpenGLPFAColorSize;
attr[i++] = SDL_BYTESPERPIXEL(display->current_mode.format)*8;
attr[i++] = NSOpenGLPFADepthSize;
attr[i++] = _this->gl_config.depth_size;
if (_this->gl_config.double_buffer) {
attr[i++] = NSOpenGLPFADoubleBuffer;
}
if (_this->gl_config.stereo) {
attr[i++] = NSOpenGLPFAStereo;
}
if (_this->gl_config.stencil_size) {
attr[i++] = NSOpenGLPFAStencilSize;
attr[i++] = _this->gl_config.stencil_size;
}
if ((_this->gl_config.accum_red_size +
_this->gl_config.accum_green_size +
_this->gl_config.accum_blue_size +
_this->gl_config.accum_alpha_size) > 0) {
attr[i++] = NSOpenGLPFAAccumSize;
attr[i++] = _this->gl_config.accum_red_size + _this->gl_config.accum_green_size + _this->gl_config.accum_blue_size + _this->gl_config.accum_alpha_size;
}
if (_this->gl_config.multisamplebuffers) {
attr[i++] = NSOpenGLPFASampleBuffers;
attr[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attr[i++] = NSOpenGLPFASamples;
attr[i++] = _this->gl_config.multisamplesamples;
attr[i++] = NSOpenGLPFANoRecovery;
}
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if (_this->gl_config.accelerated >= 0) {
if (_this->gl_config.accelerated) {
attr[i++] = NSOpenGLPFAAccelerated;
} else {
attr[i++] = NSOpenGLPFARendererID;
attr[i++] = kCGLRendererGenericFloatID;
}
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}
attr[i++] = NSOpenGLPFAScreenMask;
attr[i++] = CGDisplayIDToOpenGLDisplayMask(displaydata->display);
attr[i] = 0;
fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
if (fmt == nil) {
SDL_SetError ("Failed creating OpenGL pixel format");
[pool release];
return NULL;
}
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context = [[NSOpenGLContext alloc] initWithFormat:fmt shareContext:nil];
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[fmt release];
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if (context == nil) {
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SDL_SetError ("Failed creating OpenGL context");
[pool release];
return NULL;
}
/*
* Wisdom from Apple engineer in reference to UT2003's OpenGL performance:
* "You are blowing a couple of the internal OpenGL function caches. This
* appears to be happening in the VAO case. You can tell OpenGL to up
* the cache size by issuing the following calls right after you create
* the OpenGL context. The default cache size is 16." --ryan.
*/
#ifndef GLI_ARRAY_FUNC_CACHE_MAX
#define GLI_ARRAY_FUNC_CACHE_MAX 284
#endif
#ifndef GLI_SUBMIT_FUNC_CACHE_MAX
#define GLI_SUBMIT_FUNC_CACHE_MAX 280
#endif
{
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GLint cache_max = 64;
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CGLContextObj ctx = [context CGLContextObj];
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CGLSetParameter (ctx, GLI_SUBMIT_FUNC_CACHE_MAX, &cache_max);
CGLSetParameter (ctx, GLI_ARRAY_FUNC_CACHE_MAX, &cache_max);
}
/* End Wisdom from Apple Engineer section. --ryan. */
[pool release];
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if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
Cocoa_GL_DeleteContext(_this, context);
return NULL;
}
return context;
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}
int
Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
NSAutoreleasePool *pool;
pool = [[NSAutoreleasePool alloc] init];
if (context) {
SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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#ifndef FULLSCREEN_TOGGLEABLE
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if (window->flags & SDL_WINDOW_FULLSCREEN) {
[nscontext setFullScreen];
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} else
#endif
{
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[nscontext setView:[windowdata->nswindow contentView]];
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[nscontext update];
}
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[nscontext makeCurrentContext];
} else {
[NSOpenGLContext clearCurrentContext];
}
[pool release];
return 0;
}
int
Cocoa_GL_SetSwapInterval(_THIS, int interval)
{
NSAutoreleasePool *pool;
NSOpenGLContext *nscontext;
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GLint value;
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int status;
pool = [[NSAutoreleasePool alloc] init];
nscontext = [NSOpenGLContext currentContext];
if (nscontext != nil) {
value = interval;
[nscontext setValues:&value forParameter:NSOpenGLCPSwapInterval];
status = 0;
} else {
SDL_SetError("No current OpenGL context");
status = -1;
}
[pool release];
return status;
}
int
Cocoa_GL_GetSwapInterval(_THIS)
{
NSAutoreleasePool *pool;
NSOpenGLContext *nscontext;
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GLint value;
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int status;
pool = [[NSAutoreleasePool alloc] init];
nscontext = [NSOpenGLContext currentContext];
if (nscontext != nil) {
[nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
status = (int)value;
} else {
SDL_SetError("No current OpenGL context");
status = -1;
}
[pool release];
return status;
}
void
Cocoa_GL_SwapWindow(_THIS, SDL_Window * window)
{
NSAutoreleasePool *pool;
NSOpenGLContext *nscontext;
pool = [[NSAutoreleasePool alloc] init];
/* FIXME: Do we need to get the context for the window? */
nscontext = [NSOpenGLContext currentContext];
if (nscontext != nil) {
[nscontext flushBuffer];
}
[pool release];
}
void
Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context)
{
NSAutoreleasePool *pool;
NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
pool = [[NSAutoreleasePool alloc] init];
[nscontext clearDrawable];
[nscontext release];
[pool release];
}
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#endif /* SDL_VIDEO_OPENGL_CGL */
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/* vi: set ts=4 sw=4 expandtab: */