src/video/cocoa/SDL_cocoaopengl.m
author Sam Lantinga <slouken@libsdl.org>
Thu, 12 Jul 2007 06:31:36 +0000
changeset 2178 114a541cfae2
parent 1973 81255f93dfcd
child 2540 56cf872c723a
permissions -rw-r--r--
Creating a context makes it current, per the documentation. Applied a variant of the multi-card OpenGL fix from SDL 1.2
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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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 "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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/* This is implemented in Mac OS X 10.3 and above */
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#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_3
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@implementation NSOpenGLContext(CGLContextAccess)
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- (CGLContextObj)CGLContextObj;
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{
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    return _contextAuxiliary;
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}
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@end
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#endif /* < 10.3 */
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int
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Cocoa_GL_LoadLibrary(_THIS, const char *path)
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{
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    if (_this->gl_config.driver_loaded) {
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        if (path) {
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            SDL_SetError("OpenGL library already loaded");
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            return -1;
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        } else {
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            ++_this->gl_config.driver_loaded;
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            return 0;
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        }
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    }
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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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    _this->gl_config.driver_loaded = 1;
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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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static void
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Cocoa_GL_UnloadLibrary(_THIS)
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{
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    if (_this->gl_config.driver_loaded > 0) {
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        if (--_this->gl_config.driver_loaded > 0) {
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            return;
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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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}
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static int
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Cocoa_GL_Initialize(_THIS)
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{
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    if (_this->gl_data) {
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        ++_this->gl_data->initialized;
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        return 0;
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    }
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    _this->gl_data =
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        (struct SDL_GLDriverData *) SDL_calloc(1,
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                                               sizeof(struct
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                                                      SDL_GLDriverData));
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    if (!_this->gl_data) {
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        SDL_OutOfMemory();
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        return -1;
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    }
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    _this->gl_data->initialized = 1;
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    if (Cocoa_GL_LoadLibrary(_this, NULL) < 0) {
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        return -1;
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    }
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    return 0;
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}
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static void
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Cocoa_GL_Shutdown(_THIS)
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{
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    if (!_this->gl_data || (--_this->gl_data->initialized > 0)) {
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        return;
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    }
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    Cocoa_GL_UnloadLibrary(_this);
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    SDL_free(_this->gl_data);
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    _this->gl_data = NULL;
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}
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int
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Cocoa_GL_SetupWindow(_THIS, SDL_Window * window)
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{
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    if (Cocoa_GL_Initialize(_this) < 0) {
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        return -1;
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    }
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    return 0;
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}
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void
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Cocoa_GL_CleanupWindow(_THIS, SDL_Window * window)
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{
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    Cocoa_GL_Shutdown(_this);
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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_GetDisplayFromWindow(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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    if (window->flags & SDL_WINDOW_FULLSCREEN) {
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        attr[i++] = NSOpenGLPFAFullScreen;
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    }
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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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        attr[i++] = NSOpenGLPFAAccelerated;
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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) {
1936
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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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   226
     * 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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   231
     */
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    #ifndef GLI_ARRAY_FUNC_CACHE_MAX
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   234
    #define GLI_ARRAY_FUNC_CACHE_MAX 284
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   235
    #endif
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   237
    #ifndef GLI_SUBMIT_FUNC_CACHE_MAX
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   238
    #define GLI_SUBMIT_FUNC_CACHE_MAX 280
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   239
    #endif
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   241
    {
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        long cache_max = 64;
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   243
        CGLContextObj ctx = [context CGLContextObj];
1936
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   244
        CGLSetParameter (ctx, GLI_SUBMIT_FUNC_CACHE_MAX, &cache_max);
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   245
        CGLSetParameter (ctx, GLI_ARRAY_FUNC_CACHE_MAX, &cache_max);
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diff changeset
   246
    }
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   248
    /* End Wisdom from Apple Engineer section. --ryan. */
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   250
    [pool release];
2178
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   252
    if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
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diff changeset
   253
        Cocoa_GL_DeleteContext(_this, context);
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   254
        return NULL;
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diff changeset
   255
    }
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   256
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diff changeset
   257
    return context;
1936
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diff changeset
   258
}
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int
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   261
Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
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   262
{
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   263
    NSAutoreleasePool *pool;
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   265
    pool = [[NSAutoreleasePool alloc] init];
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   267
    if (context) {
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   268
        SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
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   269
        NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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1973
81255f93dfcd Fixed fullscreen modes with Cocoa video driver.
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   271
        if (window->flags & SDL_WINDOW_FULLSCREEN) {
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   272
            [nscontext setFullScreen];
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diff changeset
   273
        } else {
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   274
            [nscontext setView:[windowdata->window contentView]];
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   275
            [nscontext update];
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diff changeset
   276
        }
1936
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        [nscontext makeCurrentContext];
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   278
    } else {
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   279
        [NSOpenGLContext clearCurrentContext];
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    }
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    [pool release];
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    return 0;
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}
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int
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Cocoa_GL_SetSwapInterval(_THIS, int interval)
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{
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    NSAutoreleasePool *pool;
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    NSOpenGLContext *nscontext;
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    long value;
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    int status;
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    pool = [[NSAutoreleasePool alloc] init];
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    nscontext = [NSOpenGLContext currentContext];
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    if (nscontext != nil) {
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        value = interval;
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        [nscontext setValues:&value forParameter:NSOpenGLCPSwapInterval];
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        status = 0;
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    } else {
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        SDL_SetError("No current OpenGL context");
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        status = -1;
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    }
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    [pool release];
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    return status;
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}
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int
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Cocoa_GL_GetSwapInterval(_THIS)
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{
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    NSAutoreleasePool *pool;
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    NSOpenGLContext *nscontext;
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    long value;
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    int status;
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    pool = [[NSAutoreleasePool alloc] init];
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    nscontext = [NSOpenGLContext currentContext];
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    if (nscontext != nil) {
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        [nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
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        status = (int)value;
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    } else {
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        SDL_SetError("No current OpenGL context");
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        status = -1;
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    }
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    [pool release];
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    return status;
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}
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void
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Cocoa_GL_SwapWindow(_THIS, SDL_Window * window)
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{
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    NSAutoreleasePool *pool;
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    NSOpenGLContext *nscontext;
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    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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   343
    if (nscontext != nil) {
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        [nscontext flushBuffer];
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   345
    }
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    [pool release];
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   348
}
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void
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Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context)
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   352
{
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   353
    NSAutoreleasePool *pool;
83946ee0ff1f Implemented OpenGL support on Mac OS X
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   354
    NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
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   356
    pool = [[NSAutoreleasePool alloc] init];
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   358
    [nscontext clearDrawable];
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   359
    [nscontext release];
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   361
    [pool release];
83946ee0ff1f Implemented OpenGL support on Mac OS X
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diff changeset
   362
}
83946ee0ff1f Implemented OpenGL support on Mac OS X
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   363
1952
420716272158 Implemented X11 OpenGL support.
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   364
#endif /* SDL_VIDEO_OPENGL_CGL */
1936
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/* vi: set ts=4 sw=4 expandtab: */