1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2006 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 */
Mac_GL_Init(_THIS)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
Mac_GL_Quit(_THIS)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 */
Mac_GL_MakeCurrent(_THIS)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
Mac_GL_SwapBuffers(_THIS)163 void Mac_GL_SwapBuffers(_THIS)
164 {
165 aglSwapBuffers(glContext);
166 }
167
Mac_GL_LoadLibrary(_THIS,const char * location)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
Mac_GL_UnloadLibrary(_THIS)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
Mac_GL_GetProcAddress(_THIS,const char * proc)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
198