1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 (at) 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 */ 197 198
