/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2009 Sam Lantinga

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 */

#if SDL_VIDEO_OPENGL_CGL

#include <OpenGL/CGLTypes.h>

#include <OpenGL/OpenGL.h>

#include <OpenGL/CGLRenderers.h>

#include "SDL_loadso.h"

#include "SDL_opengl.h"

#define DEFAULT_OPENGL "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"

/* This is implemented in Mac OS X 10.3 and above */

#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_3

@implementation NSOpenGLContext(CGLContextAccess)

- (CGLContextObj)CGLContextObj;

{

return _contextAuxiliary;

}

@end

#endif /* < 10.3 */

int

Cocoa_GL_LoadLibrary(_THIS, const char *path)

{

/* Load the OpenGL library */

if (path == NULL) {

path = SDL_getenv("SDL_OPENGL_LIBRARY");

}

if (path == NULL) {

path = DEFAULT_OPENGL;

}

_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

Cocoa_GL_UnloadLibrary(_THIS)

{

SDL_UnloadObject(_this->gl_config.dll_handle);

_this->gl_config.dll_handle = NULL;

}

SDL_GLContext

Cocoa_GL_CreateContext(_THIS, SDL_Window * window)

{

NSAutoreleasePool *pool;

SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);

SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;

NSOpenGLPixelFormatAttribute attr[32];

NSOpenGLPixelFormat *fmt;

NSOpenGLContext *context;

int i = 0;

pool = [[NSAutoreleasePool alloc] init];

if (window->flags & SDL_WINDOW_FULLSCREEN) {

attr[i++] = NSOpenGLPFAFullScreen;

}

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;

}

if (_this->gl_config.accelerated) {

attr[i++] = NSOpenGLPFAAccelerated;

} else {

attr[i++] = NSOpenGLPFARendererID;

attr[i++] = kCGLRendererGenericFloatID;

}

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;

}

context = [[NSOpenGLContext alloc] initWithFormat:fmt shareContext:nil];

[fmt release];

if (context == nil) {

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

{

long cache_max = 64;

CGLContextObj ctx = [context CGLContextObj];

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];

if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {

Cocoa_GL_DeleteContext(_this, context);

return NULL;

}

return context;

}

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;

if (window->flags & SDL_WINDOW_FULLSCREEN) {

[nscontext setFullScreen];

} else {

[nscontext setView:[windowdata->window contentView]];

[nscontext update];

}

[nscontext makeCurrentContext];

} else {

[NSOpenGLContext clearCurrentContext];

}

[pool release];

return 0;

}

int

Cocoa_GL_SetSwapInterval(_THIS, int interval)

{

NSAutoreleasePool *pool;

NSOpenGLContext *nscontext;

GLint value;

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;

GLint value;

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];

}

#endif /* SDL_VIDEO_OPENGL_CGL */

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