src/video/cocoa/SDL_cocoaopengl.m
author Sam Lantinga <slouken@libsdl.org>
Fri, 08 Apr 2011 13:03:26 -0700
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parent 5262 b530ef003506
child 6044 35448a5ea044
permissions -rw-r--r--
SDL 1.3 is now under the zlib license.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#include "SDL_cocoavideo.h"
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/* 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"
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#include "SDL_opengl.h"
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#define DEFAULT_OPENGL  "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"
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int
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Cocoa_GL_LoadLibrary(_THIS, const char *path)
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{
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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");
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    }
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    if (path == NULL) {
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        path = DEFAULT_OPENGL;
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    }
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    _this->gl_config.dll_handle = SDL_LoadObject(path);
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    if (!_this->gl_config.dll_handle) {
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        return -1;
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    }
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    SDL_strlcpy(_this->gl_config.driver_path, path,
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                SDL_arraysize(_this->gl_config.driver_path));
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    return 0;
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}
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void *
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Cocoa_GL_GetProcAddress(_THIS, const char *proc)
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{
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    return SDL_LoadFunction(_this->gl_config.dll_handle, proc);
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}
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void
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Cocoa_GL_UnloadLibrary(_THIS)
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{
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    SDL_UnloadObject(_this->gl_config.dll_handle);
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    _this->gl_config.dll_handle = NULL;
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}
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SDL_GLContext
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Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
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{
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    NSAutoreleasePool *pool;
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    SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
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    SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
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    NSOpenGLPixelFormatAttribute attr[32];
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    NSOpenGLPixelFormat *fmt;
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    NSOpenGLContext *context;
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    int i = 0;
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    pool = [[NSAutoreleasePool alloc] init];
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#ifndef FULLSCREEN_TOGGLEABLE
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    if (window->flags & SDL_WINDOW_FULLSCREEN) {
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        attr[i++] = NSOpenGLPFAFullScreen;
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    }
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#endif
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    attr[i++] = NSOpenGLPFAColorSize;
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    attr[i++] = SDL_BYTESPERPIXEL(display->current_mode.format)*8;
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    attr[i++] = NSOpenGLPFADepthSize;
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    attr[i++] = _this->gl_config.depth_size;
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    if (_this->gl_config.double_buffer) {
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        attr[i++] = NSOpenGLPFADoubleBuffer;
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    }
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    if (_this->gl_config.stereo) {
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        attr[i++] = NSOpenGLPFAStereo;
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    }
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    if (_this->gl_config.stencil_size) {
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        attr[i++] = NSOpenGLPFAStencilSize;
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        attr[i++] = _this->gl_config.stencil_size;
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    }
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    if ((_this->gl_config.accum_red_size +
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         _this->gl_config.accum_green_size +
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         _this->gl_config.accum_blue_size +
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         _this->gl_config.accum_alpha_size) > 0) {
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        attr[i++] = NSOpenGLPFAAccumSize;
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        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;
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    }
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    if (_this->gl_config.multisamplebuffers) {
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        attr[i++] = NSOpenGLPFASampleBuffers;
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        attr[i++] = _this->gl_config.multisamplebuffers;
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    }
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    if (_this->gl_config.multisamplesamples) {
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        attr[i++] = NSOpenGLPFASamples;
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        attr[i++] = _this->gl_config.multisamplesamples;
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        attr[i++] = NSOpenGLPFANoRecovery;
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    }
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    if (_this->gl_config.accelerated >= 0) {
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        if (_this->gl_config.accelerated) {
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            attr[i++] = NSOpenGLPFAAccelerated;
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        } else {
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            attr[i++] = NSOpenGLPFARendererID;
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            attr[i++] = kCGLRendererGenericFloatID;
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        }
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    }
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    attr[i++] = NSOpenGLPFAScreenMask;
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    attr[i++] = CGDisplayIDToOpenGLDisplayMask(displaydata->display);
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    attr[i] = 0;
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    fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
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    if (fmt == nil) {
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        SDL_SetError ("Failed creating OpenGL pixel format");
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        [pool release];
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        return NULL;
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    }
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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");
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        [pool release];
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        return NULL;
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    }
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    /*
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     * Wisdom from Apple engineer in reference to UT2003's OpenGL performance:
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     *  "You are blowing a couple of the internal OpenGL function caches. This
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     *  appears to be happening in the VAO case.  You can tell OpenGL to up
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     *  the cache size by issuing the following calls right after you create
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     *  the OpenGL context.  The default cache size is 16."    --ryan.
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     */
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    #ifndef GLI_ARRAY_FUNC_CACHE_MAX
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    #define GLI_ARRAY_FUNC_CACHE_MAX 284
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    #endif
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    #ifndef GLI_SUBMIT_FUNC_CACHE_MAX
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    #define GLI_SUBMIT_FUNC_CACHE_MAX 280
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    #endif
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    {
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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);
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        CGLSetParameter (ctx, GLI_ARRAY_FUNC_CACHE_MAX, &cache_max);
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    }
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    /* End Wisdom from Apple Engineer section. --ryan. */
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    [pool release];
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    if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
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        Cocoa_GL_DeleteContext(_this, context);
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        return NULL;
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    }
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    return context;
1936
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}
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int
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Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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{
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    NSAutoreleasePool *pool;
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    pool = [[NSAutoreleasePool alloc] init];
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    if (context) {
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        SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
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        NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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7a963be087ef Mostly fixed fullscreen mode on Mac OS X, and you can toggle it on and off.
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#ifndef FULLSCREEN_TOGGLEABLE
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81255f93dfcd Fixed fullscreen modes with Cocoa video driver.
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        if (window->flags & SDL_WINDOW_FULLSCREEN) {
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            [nscontext setFullScreen];
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        } else
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#endif
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   208
        {
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6512cba48440 Fixed Cocoa and OpenGL builds
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   209
            [nscontext setView:[windowdata->nswindow contentView]];
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            [nscontext update];
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diff changeset
   211
        }
1936
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        [nscontext makeCurrentContext];
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   213
    } else {
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   214
        [NSOpenGLContext clearCurrentContext];
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   215
    }
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   217
    [pool release];
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   218
    return 0;
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   219
}
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int
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   222
Cocoa_GL_SetSwapInterval(_THIS, int interval)
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{
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   224
    NSAutoreleasePool *pool;
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   225
    NSOpenGLContext *nscontext;
2703
18a472b6d745 Fixed compiler warning
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   226
    GLint value;
1936
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    int status;
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   229
    pool = [[NSAutoreleasePool alloc] init];
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   230
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   231
    nscontext = [NSOpenGLContext currentContext];
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diff changeset
   232
    if (nscontext != nil) {
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   233
        value = interval;
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   234
        [nscontext setValues:&value forParameter:NSOpenGLCPSwapInterval];
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   235
        status = 0;
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diff changeset
   236
    } else {
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   237
        SDL_SetError("No current OpenGL context");
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   238
        status = -1;
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diff changeset
   239
    }
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diff changeset
   240
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diff changeset
   241
    [pool release];
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diff changeset
   242
    return status;
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diff changeset
   243
}
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   244
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   245
int
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diff changeset
   246
Cocoa_GL_GetSwapInterval(_THIS)
83946ee0ff1f Implemented OpenGL support on Mac OS X
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diff changeset
   247
{
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diff changeset
   248
    NSAutoreleasePool *pool;
83946ee0ff1f Implemented OpenGL support on Mac OS X
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diff changeset
   249
    NSOpenGLContext *nscontext;
2703
18a472b6d745 Fixed compiler warning
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diff changeset
   250
    GLint value;
1936
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diff changeset
   251
    int status;
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   252
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   253
    pool = [[NSAutoreleasePool alloc] init];
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diff changeset
   254
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   255
    nscontext = [NSOpenGLContext currentContext];
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diff changeset
   256
    if (nscontext != nil) {
83946ee0ff1f Implemented OpenGL support on Mac OS X
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   257
        [nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
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diff changeset
   258
        status = (int)value;
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diff changeset
   259
    } else {
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   260
        SDL_SetError("No current OpenGL context");
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   261
        status = -1;
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diff changeset
   262
    }
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diff changeset
   263
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diff changeset
   264
    [pool release];
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diff changeset
   265
    return status;
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diff changeset
   266
}
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   267
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   268
void
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   269
Cocoa_GL_SwapWindow(_THIS, SDL_Window * window)
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diff changeset
   270
{
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   271
    NSAutoreleasePool *pool;
83946ee0ff1f Implemented OpenGL support on Mac OS X
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   272
    NSOpenGLContext *nscontext;
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   274
    pool = [[NSAutoreleasePool alloc] init];
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    /* FIXME: Do we need to get the context for the window? */
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    nscontext = [NSOpenGLContext currentContext];
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    if (nscontext != nil) {
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        [nscontext flushBuffer];
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    }
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    [pool release];
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}
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void
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Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context)
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{
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    NSAutoreleasePool *pool;
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    NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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    pool = [[NSAutoreleasePool alloc] init];
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    [nscontext clearDrawable];
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    [nscontext release];
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    [pool release];
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}
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#endif /* SDL_VIDEO_OPENGL_CGL */
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/* vi: set ts=4 sw=4 expandtab: */