src/video/cocoa/SDL_cocoaopengl.m
author Ryan C. Gordon <icculus@icculus.org>
Wed, 24 Apr 2013 23:11:48 -0400
changeset 7108 732d2cac80c0
parent 7085 152cc7ddfa57
child 7152 e9ed46195235
permissions -rw-r--r--
Removed Cocoa OpenGL optimization that was probably good advice 10 years ago.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 /* NSOpenGL implementation of SDL OpenGL support */
    24 
    25 #if SDL_VIDEO_OPENGL_CGL
    26 #include "SDL_cocoavideo.h"
    27 
    28 #include <OpenGL/CGLTypes.h>
    29 #include <OpenGL/OpenGL.h>
    30 #include <OpenGL/CGLRenderers.h>
    31 
    32 #include "SDL_loadso.h"
    33 #include "SDL_opengl.h"
    34 
    35 #define DEFAULT_OPENGL  "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"
    36 
    37 
    38 #ifndef kCGLPFAOpenGLProfile
    39 #define kCGLPFAOpenGLProfile 99
    40 #endif
    41 #ifndef kCGLOGLPVersion_Legacy
    42 #define kCGLOGLPVersion_Legacy 0x1000
    43 #endif
    44 #ifndef kCGLOGLPVersion_3_2_Core
    45 #define kCGLOGLPVersion_3_2_Core 0x3200
    46 #endif
    47 
    48 
    49 int
    50 Cocoa_GL_LoadLibrary(_THIS, const char *path)
    51 {
    52     /* Load the OpenGL library */
    53     if (path == NULL) {
    54         path = SDL_getenv("SDL_OPENGL_LIBRARY");
    55     }
    56     if (path == NULL) {
    57         path = DEFAULT_OPENGL;
    58     }
    59     _this->gl_config.dll_handle = SDL_LoadObject(path);
    60     if (!_this->gl_config.dll_handle) {
    61         return -1;
    62     }
    63     SDL_strlcpy(_this->gl_config.driver_path, path,
    64                 SDL_arraysize(_this->gl_config.driver_path));
    65     return 0;
    66 }
    67 
    68 void *
    69 Cocoa_GL_GetProcAddress(_THIS, const char *proc)
    70 {
    71     return SDL_LoadFunction(_this->gl_config.dll_handle, proc);
    72 }
    73 
    74 void
    75 Cocoa_GL_UnloadLibrary(_THIS)
    76 {
    77     SDL_UnloadObject(_this->gl_config.dll_handle);
    78     _this->gl_config.dll_handle = NULL;
    79 }
    80 
    81 SDL_GLContext
    82 Cocoa_GL_CreateContext(_THIS, SDL_Window * window)
    83 {
    84     const int wantver = (_this->gl_config.major_version << 8) |
    85                         (_this->gl_config.minor_version);
    86     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    87     NSAutoreleasePool *pool;
    88     SDL_VideoDisplay *display = SDL_GetDisplayForWindow(window);
    89     SDL_DisplayData *displaydata = (SDL_DisplayData *)display->driverdata;
    90     NSOpenGLPixelFormatAttribute attr[32];
    91     NSOpenGLPixelFormat *fmt;
    92     NSOpenGLContext *context;
    93     int i = 0;
    94 
    95     if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
    96         SDL_SetError ("OpenGL ES not supported on this platform");
    97         return NULL;
    98     }
    99 
   100     /* Sadly, we'll have to update this as life progresses, since we need to
   101        set an enum for context profiles, not a context version number */
   102     if (wantver > 0x0302) {
   103         SDL_SetError ("OpenGL > 3.2 is not supported on this platform");
   104         return NULL;
   105     }
   106 
   107     pool = [[NSAutoreleasePool alloc] init];
   108 
   109     /* specify a profile if we're on Lion (10.7) or later. */
   110     if (data->osversion >= 0x1070) {
   111         NSOpenGLPixelFormatAttribute profile = kCGLOGLPVersion_Legacy;
   112         if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_CORE) {
   113             if (wantver == 0x0302) {
   114                 profile = kCGLOGLPVersion_3_2_Core;
   115             }
   116         }
   117         attr[i++] = kCGLPFAOpenGLProfile;
   118         attr[i++] = profile;
   119     }
   120 
   121 #ifndef FULLSCREEN_TOGGLEABLE
   122     if (window->flags & SDL_WINDOW_FULLSCREEN) {
   123         attr[i++] = NSOpenGLPFAFullScreen;
   124     }
   125 #endif
   126 
   127     attr[i++] = NSOpenGLPFAColorSize;
   128     attr[i++] = SDL_BYTESPERPIXEL(display->current_mode.format)*8;
   129 
   130     attr[i++] = NSOpenGLPFADepthSize;
   131     attr[i++] = _this->gl_config.depth_size;
   132 
   133     if (_this->gl_config.double_buffer) {
   134         attr[i++] = NSOpenGLPFADoubleBuffer;
   135     }
   136 
   137     if (_this->gl_config.stereo) {
   138         attr[i++] = NSOpenGLPFAStereo;
   139     }
   140 
   141     if (_this->gl_config.stencil_size) {
   142         attr[i++] = NSOpenGLPFAStencilSize;
   143         attr[i++] = _this->gl_config.stencil_size;
   144     }
   145 
   146     if ((_this->gl_config.accum_red_size +
   147          _this->gl_config.accum_green_size +
   148          _this->gl_config.accum_blue_size +
   149          _this->gl_config.accum_alpha_size) > 0) {
   150         attr[i++] = NSOpenGLPFAAccumSize;
   151         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;
   152     }
   153 
   154     if (_this->gl_config.multisamplebuffers) {
   155         attr[i++] = NSOpenGLPFASampleBuffers;
   156         attr[i++] = _this->gl_config.multisamplebuffers;
   157     }
   158 
   159     if (_this->gl_config.multisamplesamples) {
   160         attr[i++] = NSOpenGLPFASamples;
   161         attr[i++] = _this->gl_config.multisamplesamples;
   162         attr[i++] = NSOpenGLPFANoRecovery;
   163     }
   164 
   165     if (_this->gl_config.accelerated >= 0) {
   166         if (_this->gl_config.accelerated) {
   167             attr[i++] = NSOpenGLPFAAccelerated;
   168         } else {
   169             attr[i++] = NSOpenGLPFARendererID;
   170             attr[i++] = kCGLRendererGenericFloatID;
   171         }
   172     }
   173 
   174     attr[i++] = NSOpenGLPFAScreenMask;
   175     attr[i++] = CGDisplayIDToOpenGLDisplayMask(displaydata->display);
   176     attr[i] = 0;
   177 
   178     fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
   179     if (fmt == nil) {
   180         SDL_SetError ("Failed creating OpenGL pixel format");
   181         [pool release];
   182         return NULL;
   183     }
   184 
   185     context = [[NSOpenGLContext alloc] initWithFormat:fmt shareContext:nil];
   186 
   187     [fmt release];
   188 
   189     if (context == nil) {
   190         SDL_SetError ("Failed creating OpenGL context");
   191         [pool release];
   192         return NULL;
   193     }
   194 
   195     [pool release];
   196 
   197     if ( Cocoa_GL_MakeCurrent(_this, window, context) < 0 ) {
   198         Cocoa_GL_DeleteContext(_this, context);
   199         return NULL;
   200     }
   201 
   202     return context;
   203 }
   204 
   205 int
   206 Cocoa_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
   207 {
   208     NSAutoreleasePool *pool;
   209 
   210     pool = [[NSAutoreleasePool alloc] init];
   211 
   212     if (context) {
   213         SDL_WindowData *windowdata = (SDL_WindowData *)window->driverdata;
   214         NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
   215 
   216 #ifndef FULLSCREEN_TOGGLEABLE
   217         if (window->flags & SDL_WINDOW_FULLSCREEN) {
   218             [nscontext setFullScreen];
   219         } else
   220 #endif
   221         {
   222             [nscontext setView:[windowdata->nswindow contentView]];
   223             [nscontext update];
   224         }
   225         [nscontext makeCurrentContext];
   226     } else {
   227         [NSOpenGLContext clearCurrentContext];
   228     }
   229 
   230     [pool release];
   231     return 0;
   232 }
   233 
   234 int
   235 Cocoa_GL_SetSwapInterval(_THIS, int interval)
   236 {
   237     NSAutoreleasePool *pool;
   238     NSOpenGLContext *nscontext;
   239     GLint value;
   240     int status;
   241 
   242     pool = [[NSAutoreleasePool alloc] init];
   243 
   244     nscontext = [NSOpenGLContext currentContext];
   245     if (nscontext != nil) {
   246         value = interval;
   247         [nscontext setValues:&value forParameter:NSOpenGLCPSwapInterval];
   248         status = 0;
   249     } else {
   250         status = SDL_SetError("No current OpenGL context");
   251     }
   252 
   253     [pool release];
   254     return status;
   255 }
   256 
   257 int
   258 Cocoa_GL_GetSwapInterval(_THIS)
   259 {
   260     NSAutoreleasePool *pool;
   261     NSOpenGLContext *nscontext;
   262     GLint value;
   263     int status = 0;
   264 
   265     pool = [[NSAutoreleasePool alloc] init];
   266 
   267     nscontext = [NSOpenGLContext currentContext];
   268     if (nscontext != nil) {
   269         [nscontext getValues:&value forParameter:NSOpenGLCPSwapInterval];
   270         status = (int)value;
   271     }
   272 
   273     [pool release];
   274     return status;
   275 }
   276 
   277 void
   278 Cocoa_GL_SwapWindow(_THIS, SDL_Window * window)
   279 {
   280     NSAutoreleasePool *pool;
   281     NSOpenGLContext *nscontext;
   282 
   283     pool = [[NSAutoreleasePool alloc] init];
   284 
   285     /* FIXME: Do we need to get the context for the window? */
   286     [[NSOpenGLContext currentContext] flushBuffer];
   287 
   288     [pool release];
   289 }
   290 
   291 void
   292 Cocoa_GL_DeleteContext(_THIS, SDL_GLContext context)
   293 {
   294     NSAutoreleasePool *pool;
   295     NSOpenGLContext *nscontext = (NSOpenGLContext *)context;
   296 
   297     pool = [[NSAutoreleasePool alloc] init];
   298 
   299     [nscontext clearDrawable];
   300     [nscontext release];
   301 
   302     [pool release];
   303 }
   304 
   305 #endif /* SDL_VIDEO_OPENGL_CGL */
   306 
   307 /* vi: set ts=4 sw=4 expandtab: */