SDL-1.2.14
[sdl_omap.git] / src / video / maccommon / SDL_macgl.c
1 /*
2     SDL - Simple DirectMedia Layer
3     Copyright (C) 1997-2009 Sam Lantinga
4
5     This library is free software; you can redistribute it and/or
6     modify it under the terms of the GNU Lesser General Public
7     License as published by the Free Software Foundation; either
8     version 2.1 of the License, or (at your option) any later version.
9
10     This library is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13     Lesser General Public License for more details.
14
15     You should have received a copy of the GNU Lesser General Public
16     License along with this library; if not, write to the Free Software
17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18
19     Sam Lantinga
20     slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 /* AGL implementation of SDL OpenGL support */
25
26 #include "SDL_lowvideo.h"
27 #include "SDL_macgl_c.h"
28 #include "SDL_loadso.h"
29
30
31 /* krat: adding OpenGL support */
32 int Mac_GL_Init(_THIS)
33 {
34 #if SDL_VIDEO_OPENGL
35         AGLPixelFormat format;
36         int i = 0;
37         GLint attributes [ 26 ]; /* 26 is max possible in this setup */
38         GLboolean noerr;
39    
40         /* load the gl driver from a default path */
41         if ( ! this->gl_config.driver_loaded ) {
42                 /* no driver has been loaded, use default (ourselves) */
43                 if ( Mac_GL_LoadLibrary(this, NULL) < 0 ) {
44                         return(-1);
45                 }
46         }
47
48         attributes[i++] = AGL_RGBA;
49         if ( this->gl_config.red_size   != 0 &&
50              this->gl_config.blue_size  != 0 &&
51              this->gl_config.green_size != 0 ) {
52                 attributes[i++] = AGL_RED_SIZE;
53                 attributes[i++] = this->gl_config.red_size;
54                 attributes[i++] = AGL_GREEN_SIZE;
55                 attributes[i++] = this->gl_config.green_size;
56                 attributes[i++] = AGL_BLUE_SIZE;
57                 attributes[i++] = this->gl_config.blue_size;
58                 attributes[i++] = AGL_ALPHA_SIZE;
59                 attributes[i++] = this->gl_config.alpha_size;
60         }
61         if ( this->gl_config.double_buffer ) {
62                 attributes[i++] = AGL_DOUBLEBUFFER;
63         }
64         if ( this->gl_config.depth_size != 0 ) {
65                 attributes[i++] = AGL_DEPTH_SIZE;
66                 attributes[i++] = this->gl_config.depth_size;
67         }       
68         if ( this->gl_config.stencil_size != 0 ) {
69                 attributes[i++] = AGL_STENCIL_SIZE;
70                 attributes[i++] = this->gl_config.stencil_size;
71         }
72         if ( this->gl_config.accum_red_size   != 0 &&
73              this->gl_config.accum_blue_size  != 0 &&
74              this->gl_config.accum_green_size != 0 ) {
75                 
76                 attributes[i++] = AGL_ACCUM_RED_SIZE;
77                 attributes[i++] = this->gl_config.accum_red_size;
78                 attributes[i++] = AGL_ACCUM_GREEN_SIZE;
79                 attributes[i++] = this->gl_config.accum_green_size;
80                 attributes[i++] = AGL_ACCUM_BLUE_SIZE;
81                 attributes[i++] = this->gl_config.accum_blue_size;
82                 attributes[i++] = AGL_ACCUM_ALPHA_SIZE;
83                 attributes[i++] = this->gl_config.accum_alpha_size;
84         }
85         if ( this->gl_config.stereo ) {
86                 attributes[i++] = AGL_STEREO;
87         }
88 #if defined(AGL_SAMPLE_BUFFERS_ARB) && defined(AGL_SAMPLES_ARB)
89         if ( this->gl_config.multisamplebuffers != 0 ) {
90                 attributes[i++] = AGL_SAMPLE_BUFFERS_ARB;
91                 attributes[i++] = this->gl_config.multisamplebuffers;
92         }       
93         if ( this->gl_config.multisamplesamples != 0 ) {
94                 attributes[i++] = AGL_SAMPLES_ARB;
95                 attributes[i++] = this->gl_config.multisamplesamples;
96         }       
97 #endif
98         if ( this->gl_config.accelerated > 0 ) {
99                 attributes[i++] = AGL_ACCELERATED;
100                 attributes[i++] = AGL_NO_RECOVERY;
101         }
102
103         attributes[i++] = AGL_ALL_RENDERERS;
104         attributes[i]   = AGL_NONE;
105
106         format = aglChoosePixelFormat(NULL, 0, attributes);
107         if ( format == NULL ) {
108                 SDL_SetError("Couldn't match OpenGL desired format");
109                 return(-1);
110         }
111
112         glContext = aglCreateContext(format, NULL);
113         if ( glContext == NULL ) {
114                 SDL_SetError("Couldn't create OpenGL context");
115                 return(-1);
116         }
117         aglDestroyPixelFormat(format);
118
119     #if  TARGET_API_MAC_CARBON
120         noerr = aglSetDrawable(glContext, GetWindowPort(SDL_Window));
121     #else
122         noerr = aglSetDrawable(glContext, (AGLDrawable)SDL_Window);
123     #endif
124     
125         if(!noerr) {
126                 SDL_SetError("Unable to bind GL context to window");
127                 return(-1);
128         }
129         return(0);
130 #else
131         SDL_SetError("OpenGL support not configured");
132         return(-1);
133 #endif
134 }
135
136 void Mac_GL_Quit(_THIS)
137 {
138 #if SDL_VIDEO_OPENGL
139         if ( glContext != NULL ) {
140                 aglSetCurrentContext(NULL);
141                 aglSetDrawable(glContext, NULL);
142                 aglDestroyContext(glContext);           
143                 glContext = NULL;
144         }
145 #endif
146 }
147
148 #if SDL_VIDEO_OPENGL
149
150 /* Make the current context active */
151 int Mac_GL_MakeCurrent(_THIS)
152 {
153         int retval;
154
155         retval = 0;
156         if( ! aglSetCurrentContext(glContext) ) {
157                 SDL_SetError("Unable to make GL context current");
158                 retval = -1;
159         }
160         return(retval);
161 }
162
163 void Mac_GL_SwapBuffers(_THIS)
164 {
165         aglSwapBuffers(glContext);
166 }
167
168 int Mac_GL_LoadLibrary(_THIS, const char *location)
169 {
170         if (location == NULL)
171 #if __MACH__
172                 location = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
173 #else
174                 location = "OpenGLLibrary";
175 #endif
176
177         this->hidden->libraryHandle = SDL_LoadObject(location);
178
179         this->gl_config.driver_loaded = 1;
180         return (this->hidden->libraryHandle != NULL) ? 0 : -1;
181 }
182
183 void Mac_GL_UnloadLibrary(_THIS)
184 {
185         SDL_UnloadObject(this->hidden->libraryHandle);
186
187         this->hidden->libraryHandle = NULL;
188         this->gl_config.driver_loaded = 0;
189 }
190
191 void* Mac_GL_GetProcAddress(_THIS, const char *proc)
192 {
193         return SDL_LoadFunction( this->hidden->libraryHandle, proc );
194 }
195
196 #endif /* SDL_VIDEO_OPENGL */
197