Mercurial > sdl-ios-xcode
annotate src/video/wincommon/SDL_wingl.c @ 252:e8157fcb3114
Updated the source with the correct e-mail address
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 14 Dec 2001 12:38:15 +0000 |
| parents | 74212992fb08 |
| children | f6ffac90895c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* WGL implementation of SDL OpenGL support */ | |
| 29 | |
| 30 #include <windows.h> | |
| 31 | |
| 32 #include "SDL_error.h" | |
| 33 #include "SDL_lowvideo.h" | |
| 34 #include "SDL_wingl_c.h" | |
| 35 | |
| 36 #ifdef HAVE_OPENGL | |
| 37 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" | |
| 38 #endif | |
| 39 | |
| 40 | |
| 41 int WIN_GL_SetupWindow(_THIS) | |
| 42 { | |
| 43 int retval; | |
| 44 #ifdef HAVE_OPENGL | |
| 45 int pixel_format; | |
| 46 | |
| 47 /* load the gl driver from a default path */ | |
| 48 if ( ! this->gl_config.driver_loaded ) { | |
| 49 /* no driver has been loaded, use default (ourselves) */ | |
| 50 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { | |
| 51 return(-1); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 /* Get the window device context for our OpenGL drawing */ | |
| 56 GL_hdc = GetDC(SDL_Window); | |
| 57 if ( GL_hdc == NULL ) { | |
| 58 SDL_SetError("Unable to get DC for SDL_Window"); | |
| 59 return(-1); | |
| 60 } | |
| 61 | |
| 62 /* Set up the pixel format descriptor with our needed format */ | |
| 63 memset(&GL_pfd, 0, sizeof(GL_pfd)); | |
| 64 GL_pfd.nSize = sizeof(GL_pfd); | |
| 65 GL_pfd.nVersion = 1; | |
| 66 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); | |
| 67 if ( this->gl_config.double_buffer ) { | |
| 68 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; | |
| 69 } | |
| 70 GL_pfd.iPixelType = PFD_TYPE_RGBA; | |
| 71 GL_pfd.cColorBits = this->gl_config.buffer_size; | |
| 72 GL_pfd.cRedBits = this->gl_config.red_size; | |
| 73 GL_pfd.cGreenBits = this->gl_config.green_size; | |
| 74 GL_pfd.cBlueBits = this->gl_config.blue_size; | |
| 75 GL_pfd.cAlphaBits = this->gl_config.alpha_size; | |
| 76 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; | |
| 77 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; | |
| 78 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; | |
| 79 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; | |
| 80 GL_pfd.cAccumBits = | |
| 81 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + | |
| 82 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); | |
| 83 GL_pfd.cDepthBits = this->gl_config.depth_size; | |
| 84 GL_pfd.cStencilBits = this->gl_config.stencil_size; | |
| 85 | |
| 86 /* Choose and set the closest available pixel format */ | |
| 87 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); | |
| 88 if ( !pixel_format ) { | |
| 89 SDL_SetError("No matching GL pixel format available"); | |
| 90 return(-1); | |
| 91 } | |
| 92 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { | |
| 93 SDL_SetError("Unable to set HDC pixel format"); | |
| 94 return(-1); | |
| 95 } | |
| 96 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); | |
| 97 | |
| 98 GL_hrc = this->gl_data->wglCreateContext(GL_hdc); | |
| 99 if( GL_hrc == NULL ) { | |
| 100 SDL_SetError("Unable to create GL context"); | |
| 101 return(-1); | |
| 102 } | |
| 103 gl_active = 1; | |
| 104 #else | |
| 105 SDL_SetError("WIN driver not configured with OpenGL"); | |
| 106 #endif | |
| 107 if ( gl_active ) { | |
| 108 retval = 0; | |
| 109 } else { | |
| 110 retval = -1; | |
| 111 } | |
| 112 return(retval); | |
| 113 } | |
| 114 | |
| 115 void WIN_GL_ShutDown(_THIS) | |
| 116 { | |
| 117 #ifdef HAVE_OPENGL | |
| 118 /* Clean up OpenGL */ | |
| 119 if ( GL_hrc ) { | |
| 120 this->gl_data->wglMakeCurrent(NULL, NULL); | |
| 121 this->gl_data->wglDeleteContext(GL_hrc); | |
| 122 GL_hrc = NULL; | |
| 123 } | |
| 124 if ( GL_hdc ) { | |
| 125 ReleaseDC(SDL_Window, GL_hdc); | |
| 126 GL_hdc = NULL; | |
| 127 } | |
| 128 gl_active = 0; | |
| 129 | |
| 130 WIN_GL_UnloadLibrary(this); | |
| 131 #endif /* HAVE_OPENGL */ | |
| 132 } | |
| 133 | |
| 134 #ifdef HAVE_OPENGL | |
| 135 | |
| 136 /* Make the current context active */ | |
| 137 int WIN_GL_MakeCurrent(_THIS) | |
| 138 { | |
| 139 int retval; | |
| 140 | |
| 141 retval = 0; | |
| 142 if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) { | |
| 143 SDL_SetError("Unable to make GL context current"); | |
| 144 retval = -1; | |
| 145 } | |
| 146 return(retval); | |
| 147 } | |
| 148 | |
| 149 /* Get attribute data from glX. */ | |
| 150 int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
| 151 { | |
| 152 int retval; | |
| 153 | |
| 154 retval = 0; | |
| 155 switch( attrib ) { | |
| 156 case SDL_GL_RED_SIZE: | |
| 157 *value = GL_pfd.cRedBits; | |
| 158 break; | |
| 159 case SDL_GL_GREEN_SIZE: | |
| 160 *value = GL_pfd.cGreenBits; | |
| 161 break; | |
| 162 case SDL_GL_BLUE_SIZE: | |
| 163 *value = GL_pfd.cBlueBits; | |
| 164 break; | |
| 165 case SDL_GL_ALPHA_SIZE: | |
| 166 *value = GL_pfd.cAlphaBits; | |
| 167 break; | |
| 168 case SDL_GL_DOUBLEBUFFER: | |
| 169 if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) { | |
| 170 *value = 1; | |
| 171 } else { | |
| 172 *value = 0; | |
| 173 } | |
| 174 break; | |
| 175 case SDL_GL_BUFFER_SIZE: | |
| 176 *value = GL_pfd.cColorBits; | |
| 177 break; | |
| 178 case SDL_GL_DEPTH_SIZE: | |
| 179 *value = GL_pfd.cDepthBits; | |
| 180 break; | |
| 181 case SDL_GL_STENCIL_SIZE: | |
| 182 *value = GL_pfd.cStencilBits; | |
| 183 break; | |
| 184 case SDL_GL_ACCUM_RED_SIZE: | |
| 185 *value = GL_pfd.cAccumRedBits; | |
| 186 break; | |
| 187 case SDL_GL_ACCUM_GREEN_SIZE: | |
| 188 *value = GL_pfd.cAccumGreenBits; | |
| 189 break; | |
| 190 case SDL_GL_ACCUM_BLUE_SIZE: | |
| 191 *value = GL_pfd.cAccumBlueBits; | |
| 192 break; | |
| 193 case SDL_GL_ACCUM_ALPHA_SIZE: | |
| 194 *value = GL_pfd.cAccumAlphaBits; | |
| 195 break; | |
| 196 default: | |
| 197 retval = -1; | |
| 198 break; | |
| 199 } | |
| 200 return retval; | |
| 201 } | |
| 202 | |
| 203 void WIN_GL_SwapBuffers(_THIS) | |
| 204 { | |
| 205 SwapBuffers(GL_hdc); | |
| 206 } | |
| 207 | |
| 208 #endif /* HAVE_OPENGL */ | |
| 209 | |
| 210 #ifdef HAVE_OPENGL | |
| 211 | |
| 212 void WIN_GL_UnloadLibrary(_THIS) | |
| 213 { | |
| 214 if ( this->gl_config.driver_loaded ) { | |
| 215 FreeLibrary((HMODULE)this->gl_config.dll_handle); | |
| 216 | |
| 217 this->gl_data->wglGetProcAddress = NULL; | |
| 218 this->gl_data->wglCreateContext = NULL; | |
| 219 this->gl_data->wglDeleteContext = NULL; | |
| 220 this->gl_data->wglMakeCurrent = NULL; | |
| 221 | |
| 222 this->gl_config.dll_handle = NULL; | |
| 223 this->gl_config.driver_loaded = 0; | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 /* Passing a NULL path means load pointers from the application */ | |
| 228 int WIN_GL_LoadLibrary(_THIS, const char* path) | |
| 229 { | |
| 230 HMODULE handle; | |
| 231 | |
| 232 if ( gl_active ) { | |
| 233 SDL_SetError("OpenGL context already created"); | |
| 234 return -1; | |
| 235 } | |
| 236 | |
| 237 if ( path == NULL ) { | |
| 238 path = DEFAULT_GL_DRIVER_PATH; | |
| 239 } | |
| 240 handle = LoadLibrary(path); | |
| 241 if ( handle == NULL ) { | |
| 242 SDL_SetError("Could not load OpenGL library"); | |
| 243 return -1; | |
| 244 } | |
| 245 | |
| 246 /* Unload the old driver and reset the pointers */ | |
| 247 WIN_GL_UnloadLibrary(this); | |
| 248 | |
| 249 /* Load new function pointers */ | |
| 250 this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *)) | |
| 251 GetProcAddress(handle, "wglGetProcAddress"); | |
| 252 this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC)) | |
| 253 GetProcAddress(handle, "wglCreateContext"); | |
| 254 this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC)) | |
| 255 GetProcAddress(handle, "wglDeleteContext"); | |
| 256 this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC)) | |
| 257 GetProcAddress(handle, "wglMakeCurrent"); | |
| 258 | |
| 259 if ( (this->gl_data->wglGetProcAddress == NULL) || | |
| 260 (this->gl_data->wglCreateContext == NULL) || | |
| 261 (this->gl_data->wglDeleteContext == NULL) || | |
| 262 (this->gl_data->wglMakeCurrent == NULL) ) { | |
| 263 SDL_SetError("Could not retrieve OpenGL functions"); | |
| 264 FreeLibrary(handle); | |
| 265 return -1; | |
| 266 } | |
| 267 | |
| 268 this->gl_config.dll_handle = handle; | |
| 269 strcpy(this->gl_config.driver_path, path); | |
| 270 this->gl_config.driver_loaded = 1; | |
| 271 return 0; | |
| 272 } | |
| 273 | |
| 274 void *WIN_GL_GetProcAddress(_THIS, const char* proc) | |
| 275 { | |
| 276 void *func; | |
| 277 | |
| 278 /* This is to pick up extensions */ | |
| 279 func = this->gl_data->wglGetProcAddress(proc); | |
| 280 if ( ! func ) { | |
| 281 /* This is probably a normal GL function */ | |
| 282 func = GetProcAddress(this->gl_config.dll_handle, proc); | |
| 283 } | |
| 284 return func; | |
| 285 } | |
| 286 | |
| 287 #endif /* HAVE_OPENGL */ |