| 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 | |