| 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 | /* WGL implementation of SDL OpenGL support */ |
| 25 | |
| 26 | #if SDL_VIDEO_OPENGL |
| 27 | #include "SDL_opengl.h" |
| 28 | #endif |
| 29 | #include "SDL_lowvideo.h" |
| 30 | #include "SDL_wingl_c.h" |
| 31 | |
| 32 | #if SDL_VIDEO_OPENGL |
| 33 | #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" |
| 34 | #endif |
| 35 | |
| 36 | /* If setting the HDC fails, we may need to recreate the window (MSDN) */ |
| 37 | static int WIN_GL_ResetWindow(_THIS) |
| 38 | { |
| 39 | int status = 0; |
| 40 | |
| 41 | #ifndef _WIN32_WCE /* FIXME WinCE needs the UNICODE version of CreateWindow() */ |
| 42 | /* This doesn't work with DirectX code (see CVS comments) */ |
| 43 | /* If we were passed a window, then we can't create a new one */ |
| 44 | if ( !SDL_windowid && SDL_strcmp(this->name, "windib") == 0 ) { |
| 45 | /* Save the existing window attributes */ |
| 46 | LONG style; |
| 47 | RECT rect = { 0, 0, 0, 0 }; |
| 48 | style = GetWindowLong(SDL_Window, GWL_STYLE); |
| 49 | GetWindowRect(SDL_Window, &rect); |
| 50 | DestroyWindow(SDL_Window); |
| 51 | WIN_FlushMessageQueue(); |
| 52 | |
| 53 | SDL_resizing = 1; |
| 54 | SDL_Window = CreateWindow(SDL_Appname, SDL_Appname, |
| 55 | style, |
| 56 | rect.left, rect.top, |
| 57 | (rect.right-rect.left)+1, |
| 58 | (rect.bottom-rect.top)+1, |
| 59 | NULL, NULL, SDL_Instance, NULL); |
| 60 | WIN_FlushMessageQueue(); |
| 61 | SDL_resizing = 0; |
| 62 | |
| 63 | if ( SDL_Window ) { |
| 64 | this->SetCaption(this, this->wm_title, this->wm_icon); |
| 65 | } else { |
| 66 | SDL_SetError("Couldn't create window"); |
| 67 | status = -1; |
| 68 | } |
| 69 | } else |
| 70 | #endif /* !_WIN32_WCE */ |
| 71 | { |
| 72 | SDL_SetError("Unable to reset window for OpenGL context"); |
| 73 | status = -1; |
| 74 | } |
| 75 | return(status); |
| 76 | } |
| 77 | |
| 78 | #if SDL_VIDEO_OPENGL |
| 79 | |
| 80 | static int ExtensionSupported(const char *extension, const char *extensions) |
| 81 | { |
| 82 | const char *start; |
| 83 | const char *where, *terminator; |
| 84 | |
| 85 | /* Extension names should not have spaces. */ |
| 86 | where = SDL_strchr(extension, ' '); |
| 87 | if ( where || *extension == '\0' ) |
| 88 | return 0; |
| 89 | |
| 90 | if ( ! extensions ) |
| 91 | return 0; |
| 92 | |
| 93 | /* It takes a bit of care to be fool-proof about parsing the |
| 94 | * OpenGL extensions string. Don't be fooled by sub-strings, |
| 95 | * etc. */ |
| 96 | |
| 97 | start = extensions; |
| 98 | |
| 99 | for (;;) |
| 100 | { |
| 101 | where = SDL_strstr(start, extension); |
| 102 | if (!where) break; |
| 103 | |
| 104 | terminator = where + SDL_strlen(extension); |
| 105 | if (where == start || *(where - 1) == ' ') |
| 106 | if (*terminator == ' ' || *terminator == '\0') return 1; |
| 107 | |
| 108 | start = terminator; |
| 109 | } |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static int ChoosePixelFormatARB(_THIS, const int *iAttribs, const FLOAT *fAttribs) |
| 115 | { |
| 116 | HWND hwnd; |
| 117 | HDC hdc; |
| 118 | HGLRC hglrc; |
| 119 | const char * (WINAPI *wglGetExtensionsStringARB)(HDC) = 0; |
| 120 | const char *extensions; |
| 121 | int pformat = 0; |
| 122 | UINT matches = 0; |
| 123 | |
| 124 | hwnd = CreateWindow(SDL_Appname, SDL_Appname, WS_POPUP | WS_DISABLED, |
| 125 | 0, 0, 10, 10, |
| 126 | NULL, NULL, SDL_Instance, NULL); |
| 127 | WIN_FlushMessageQueue(); |
| 128 | |
| 129 | hdc = GetDC(hwnd); |
| 130 | |
| 131 | SetPixelFormat(hdc, ChoosePixelFormat(hdc, &GL_pfd), &GL_pfd); |
| 132 | |
| 133 | hglrc = this->gl_data->wglCreateContext(hdc); |
| 134 | if ( hglrc ) { |
| 135 | this->gl_data->wglMakeCurrent(hdc, hglrc); |
| 136 | } |
| 137 | |
| 138 | wglGetExtensionsStringARB = (const char * (WINAPI *)(HDC)) |
| 139 | this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB"); |
| 140 | |
| 141 | if( wglGetExtensionsStringARB ) { |
| 142 | extensions = wglGetExtensionsStringARB(hdc); |
| 143 | } else { |
| 144 | extensions = NULL; |
| 145 | } |
| 146 | |
| 147 | this->gl_data->WGL_ARB_pixel_format = 0; |
| 148 | if( ExtensionSupported("WGL_ARB_pixel_format", extensions) ) { |
| 149 | BOOL (WINAPI *wglChoosePixelFormatARB)(HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats); |
| 150 | wglChoosePixelFormatARB = |
| 151 | (BOOL (WINAPI *)(HDC, const int *, const FLOAT *, UINT, int *, UINT *)) |
| 152 | this->gl_data->wglGetProcAddress("wglChoosePixelFormatARB"); |
| 153 | if( wglChoosePixelFormatARB && |
| 154 | wglChoosePixelFormatARB(hdc, iAttribs, fAttribs, 1, &pformat, &matches) && pformat ) { |
| 155 | this->gl_data->WGL_ARB_pixel_format = 1; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | if ( hglrc ) { |
| 160 | this->gl_data->wglMakeCurrent(NULL, NULL); |
| 161 | this->gl_data->wglDeleteContext(hglrc); |
| 162 | } |
| 163 | ReleaseDC(hwnd, hdc); |
| 164 | DestroyWindow(hwnd); |
| 165 | WIN_FlushMessageQueue(); |
| 166 | |
| 167 | return pformat; |
| 168 | } |
| 169 | |
| 170 | #endif /* SDL_VIDEO_OPENGL */ |
| 171 | |
| 172 | int WIN_GL_SetupWindow(_THIS) |
| 173 | { |
| 174 | int retval; |
| 175 | #if SDL_VIDEO_OPENGL |
| 176 | int i; |
| 177 | int iAttribs[64]; |
| 178 | int *iAttr; |
| 179 | float fAttribs[1] = { 0 }; |
| 180 | const GLubyte *(WINAPI *glGetStringFunc)(GLenum); |
| 181 | const char *wglext; |
| 182 | |
| 183 | /* load the gl driver from a default path */ |
| 184 | if ( ! this->gl_config.driver_loaded ) { |
| 185 | /* no driver has been loaded, use default (ourselves) */ |
| 186 | if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { |
| 187 | return(-1); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | /* Set up the pixel format descriptor with our needed format */ |
| 192 | SDL_memset(&GL_pfd, 0, sizeof(GL_pfd)); |
| 193 | GL_pfd.nSize = sizeof(GL_pfd); |
| 194 | GL_pfd.nVersion = 1; |
| 195 | GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); |
| 196 | if ( this->gl_config.double_buffer ) { |
| 197 | GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; |
| 198 | } |
| 199 | if ( this->gl_config.stereo ) { |
| 200 | GL_pfd.dwFlags |= PFD_STEREO; |
| 201 | } |
| 202 | GL_pfd.iPixelType = PFD_TYPE_RGBA; |
| 203 | GL_pfd.cColorBits = this->gl_config.buffer_size; |
| 204 | GL_pfd.cRedBits = this->gl_config.red_size; |
| 205 | GL_pfd.cGreenBits = this->gl_config.green_size; |
| 206 | GL_pfd.cBlueBits = this->gl_config.blue_size; |
| 207 | GL_pfd.cAlphaBits = this->gl_config.alpha_size; |
| 208 | GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; |
| 209 | GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; |
| 210 | GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; |
| 211 | GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; |
| 212 | GL_pfd.cAccumBits = |
| 213 | (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + |
| 214 | GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); |
| 215 | GL_pfd.cDepthBits = this->gl_config.depth_size; |
| 216 | GL_pfd.cStencilBits = this->gl_config.stencil_size; |
| 217 | |
| 218 | /* setup WGL_ARB_pixel_format attribs */ |
| 219 | iAttr = &iAttribs[0]; |
| 220 | |
| 221 | *iAttr++ = WGL_DRAW_TO_WINDOW_ARB; |
| 222 | *iAttr++ = GL_TRUE; |
| 223 | *iAttr++ = WGL_ACCELERATION_ARB; |
| 224 | *iAttr++ = WGL_FULL_ACCELERATION_ARB; |
| 225 | *iAttr++ = WGL_RED_BITS_ARB; |
| 226 | *iAttr++ = this->gl_config.red_size; |
| 227 | *iAttr++ = WGL_GREEN_BITS_ARB; |
| 228 | *iAttr++ = this->gl_config.green_size; |
| 229 | *iAttr++ = WGL_BLUE_BITS_ARB; |
| 230 | *iAttr++ = this->gl_config.blue_size; |
| 231 | |
| 232 | if ( this->gl_config.alpha_size ) { |
| 233 | *iAttr++ = WGL_ALPHA_BITS_ARB; |
| 234 | *iAttr++ = this->gl_config.alpha_size; |
| 235 | } |
| 236 | |
| 237 | *iAttr++ = WGL_DOUBLE_BUFFER_ARB; |
| 238 | *iAttr++ = this->gl_config.double_buffer; |
| 239 | |
| 240 | *iAttr++ = WGL_DEPTH_BITS_ARB; |
| 241 | *iAttr++ = this->gl_config.depth_size; |
| 242 | |
| 243 | if ( this->gl_config.stencil_size ) { |
| 244 | *iAttr++ = WGL_STENCIL_BITS_ARB; |
| 245 | *iAttr++ = this->gl_config.stencil_size; |
| 246 | } |
| 247 | |
| 248 | if ( this->gl_config.accum_red_size ) { |
| 249 | *iAttr++ = WGL_ACCUM_RED_BITS_ARB; |
| 250 | *iAttr++ = this->gl_config.accum_red_size; |
| 251 | } |
| 252 | |
| 253 | if ( this->gl_config.accum_green_size ) { |
| 254 | *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB; |
| 255 | *iAttr++ = this->gl_config.accum_green_size; |
| 256 | } |
| 257 | |
| 258 | if ( this->gl_config.accum_blue_size ) { |
| 259 | *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB; |
| 260 | *iAttr++ = this->gl_config.accum_blue_size; |
| 261 | } |
| 262 | |
| 263 | if ( this->gl_config.accum_alpha_size ) { |
| 264 | *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB; |
| 265 | *iAttr++ = this->gl_config.accum_alpha_size; |
| 266 | } |
| 267 | |
| 268 | if ( this->gl_config.stereo ) { |
| 269 | *iAttr++ = WGL_STEREO_ARB; |
| 270 | *iAttr++ = GL_TRUE; |
| 271 | } |
| 272 | |
| 273 | if ( this->gl_config.multisamplebuffers ) { |
| 274 | *iAttr++ = WGL_SAMPLE_BUFFERS_ARB; |
| 275 | *iAttr++ = this->gl_config.multisamplebuffers; |
| 276 | } |
| 277 | |
| 278 | if ( this->gl_config.multisamplesamples ) { |
| 279 | *iAttr++ = WGL_SAMPLES_ARB; |
| 280 | *iAttr++ = this->gl_config.multisamplesamples; |
| 281 | } |
| 282 | |
| 283 | if ( this->gl_config.accelerated >= 0 ) { |
| 284 | *iAttr++ = WGL_ACCELERATION_ARB; |
| 285 | *iAttr++ = (this->gl_config.accelerated ? WGL_GENERIC_ACCELERATION_ARB : WGL_NO_ACCELERATION_ARB); |
| 286 | } |
| 287 | |
| 288 | *iAttr = 0; |
| 289 | |
| 290 | for ( i=0; ; ++i ) { |
| 291 | /* Get the window device context for our OpenGL drawing */ |
| 292 | GL_hdc = GetDC(SDL_Window); |
| 293 | if ( GL_hdc == NULL ) { |
| 294 | SDL_SetError("Unable to get DC for SDL_Window"); |
| 295 | return(-1); |
| 296 | } |
| 297 | |
| 298 | /* Choose and set the closest available pixel format */ |
| 299 | pixel_format = ChoosePixelFormatARB(this, iAttribs, fAttribs); |
| 300 | if ( !pixel_format ) { |
| 301 | pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); |
| 302 | } |
| 303 | if ( !pixel_format ) { |
| 304 | SDL_SetError("No matching GL pixel format available"); |
| 305 | return(-1); |
| 306 | } |
| 307 | if ( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { |
| 308 | if ( i == 0 ) { |
| 309 | /* First time through, try resetting the window */ |
| 310 | if ( WIN_GL_ResetWindow(this) < 0 ) { |
| 311 | return(-1); |
| 312 | } |
| 313 | continue; |
| 314 | } |
| 315 | SDL_SetError("Unable to set HDC pixel format"); |
| 316 | return(-1); |
| 317 | } |
| 318 | /* We either succeeded or failed by this point */ |
| 319 | break; |
| 320 | } |
| 321 | DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); |
| 322 | |
| 323 | GL_hrc = this->gl_data->wglCreateContext(GL_hdc); |
| 324 | if ( GL_hrc == NULL ) { |
| 325 | SDL_SetError("Unable to create GL context"); |
| 326 | return(-1); |
| 327 | } |
| 328 | if ( WIN_GL_MakeCurrent(this) < 0 ) { |
| 329 | return(-1); |
| 330 | } |
| 331 | gl_active = 1; |
| 332 | |
| 333 | /* Get the wglGetPixelFormatAttribivARB pointer for the context */ |
| 334 | if ( this->gl_data->WGL_ARB_pixel_format ) { |
| 335 | this->gl_data->wglGetPixelFormatAttribivARB = |
| 336 | (BOOL (WINAPI *)(HDC, int, int, UINT, const int *, int *)) |
| 337 | this->gl_data->wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
| 338 | } else { |
| 339 | this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
| 340 | } |
| 341 | |
| 342 | /* Vsync control under Windows. Checking glGetString here is |
| 343 | * somewhat a documented and reliable hack - it was originally |
| 344 | * as a feature added by mistake, but since so many people rely |
| 345 | * on it, it will not be removed. strstr should be safe here.*/ |
| 346 | glGetStringFunc = WIN_GL_GetProcAddress(this, "glGetString"); |
| 347 | if ( glGetStringFunc ) { |
| 348 | wglext = (const char *)glGetStringFunc(GL_EXTENSIONS); |
| 349 | } else { |
| 350 | /* Uh oh, something is seriously wrong here... */ |
| 351 | wglext = NULL; |
| 352 | } |
| 353 | if ( wglext && SDL_strstr(wglext, "WGL_EXT_swap_control") ) { |
| 354 | this->gl_data->wglSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglSwapIntervalEXT"); |
| 355 | this->gl_data->wglGetSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglGetSwapIntervalEXT"); |
| 356 | } else { |
| 357 | this->gl_data->wglSwapIntervalEXT = NULL; |
| 358 | this->gl_data->wglGetSwapIntervalEXT = NULL; |
| 359 | } |
| 360 | if ( this->gl_config.swap_control >= 0 ) { |
| 361 | if ( this->gl_data->wglSwapIntervalEXT ) { |
| 362 | this->gl_data->wglSwapIntervalEXT(this->gl_config.swap_control); |
| 363 | } |
| 364 | } |
| 365 | #else |
| 366 | SDL_SetError("WIN driver not configured with OpenGL"); |
| 367 | #endif |
| 368 | if ( gl_active ) { |
| 369 | retval = 0; |
| 370 | } else { |
| 371 | retval = -1; |
| 372 | } |
| 373 | return(retval); |
| 374 | } |
| 375 | |
| 376 | void WIN_GL_ShutDown(_THIS) |
| 377 | { |
| 378 | #if SDL_VIDEO_OPENGL |
| 379 | /* Clean up OpenGL */ |
| 380 | if ( GL_hrc ) { |
| 381 | this->gl_data->wglMakeCurrent(NULL, NULL); |
| 382 | this->gl_data->wglDeleteContext(GL_hrc); |
| 383 | GL_hrc = NULL; |
| 384 | } |
| 385 | if ( GL_hdc ) { |
| 386 | ReleaseDC(SDL_Window, GL_hdc); |
| 387 | GL_hdc = NULL; |
| 388 | } |
| 389 | gl_active = 0; |
| 390 | |
| 391 | WIN_GL_UnloadLibrary(this); |
| 392 | #endif /* SDL_VIDEO_OPENGL */ |
| 393 | } |
| 394 | |
| 395 | #if SDL_VIDEO_OPENGL |
| 396 | |
| 397 | /* Make the current context active */ |
| 398 | int WIN_GL_MakeCurrent(_THIS) |
| 399 | { |
| 400 | int retval; |
| 401 | |
| 402 | retval = 0; |
| 403 | if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) { |
| 404 | SDL_SetError("Unable to make GL context current"); |
| 405 | retval = -1; |
| 406 | } |
| 407 | return(retval); |
| 408 | } |
| 409 | |
| 410 | /* Get attribute data from wgl. */ |
| 411 | int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) |
| 412 | { |
| 413 | int retval; |
| 414 | |
| 415 | if (attrib == SDL_GL_SWAP_CONTROL) { |
| 416 | if ( this->gl_data->wglGetSwapIntervalEXT ) { |
| 417 | *value = this->gl_data->wglGetSwapIntervalEXT(); |
| 418 | return 0; |
| 419 | } |
| 420 | return -1; |
| 421 | } |
| 422 | |
| 423 | if ( this->gl_data->wglGetPixelFormatAttribivARB ) { |
| 424 | int wgl_attrib; |
| 425 | |
| 426 | switch(attrib) { |
| 427 | case SDL_GL_RED_SIZE: |
| 428 | wgl_attrib = WGL_RED_BITS_ARB; |
| 429 | break; |
| 430 | case SDL_GL_GREEN_SIZE: |
| 431 | wgl_attrib = WGL_GREEN_BITS_ARB; |
| 432 | break; |
| 433 | case SDL_GL_BLUE_SIZE: |
| 434 | wgl_attrib = WGL_BLUE_BITS_ARB; |
| 435 | break; |
| 436 | case SDL_GL_ALPHA_SIZE: |
| 437 | wgl_attrib = WGL_ALPHA_BITS_ARB; |
| 438 | break; |
| 439 | case SDL_GL_DOUBLEBUFFER: |
| 440 | wgl_attrib = WGL_DOUBLE_BUFFER_ARB; |
| 441 | break; |
| 442 | case SDL_GL_BUFFER_SIZE: |
| 443 | wgl_attrib = WGL_COLOR_BITS_ARB; |
| 444 | break; |
| 445 | case SDL_GL_DEPTH_SIZE: |
| 446 | wgl_attrib = WGL_DEPTH_BITS_ARB; |
| 447 | break; |
| 448 | case SDL_GL_STENCIL_SIZE: |
| 449 | wgl_attrib = WGL_STENCIL_BITS_ARB; |
| 450 | break; |
| 451 | case SDL_GL_ACCUM_RED_SIZE: |
| 452 | wgl_attrib = WGL_ACCUM_RED_BITS_ARB; |
| 453 | break; |
| 454 | case SDL_GL_ACCUM_GREEN_SIZE: |
| 455 | wgl_attrib = WGL_ACCUM_GREEN_BITS_ARB; |
| 456 | break; |
| 457 | case SDL_GL_ACCUM_BLUE_SIZE: |
| 458 | wgl_attrib = WGL_ACCUM_BLUE_BITS_ARB; |
| 459 | break; |
| 460 | case SDL_GL_ACCUM_ALPHA_SIZE: |
| 461 | wgl_attrib = WGL_ACCUM_ALPHA_BITS_ARB; |
| 462 | break; |
| 463 | case SDL_GL_STEREO: |
| 464 | wgl_attrib = WGL_STEREO_ARB; |
| 465 | break; |
| 466 | case SDL_GL_MULTISAMPLEBUFFERS: |
| 467 | wgl_attrib = WGL_SAMPLE_BUFFERS_ARB; |
| 468 | break; |
| 469 | case SDL_GL_MULTISAMPLESAMPLES: |
| 470 | wgl_attrib = WGL_SAMPLES_ARB; |
| 471 | break; |
| 472 | case SDL_GL_ACCELERATED_VISUAL: |
| 473 | wgl_attrib = WGL_ACCELERATION_ARB; |
| 474 | this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
| 475 | if ( *value == WGL_NO_ACCELERATION_ARB ) { |
| 476 | *value = SDL_FALSE; |
| 477 | } else { |
| 478 | *value = SDL_TRUE; |
| 479 | } |
| 480 | return 0; |
| 481 | default: |
| 482 | return(-1); |
| 483 | } |
| 484 | this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | retval = 0; |
| 490 | switch ( attrib ) { |
| 491 | case SDL_GL_RED_SIZE: |
| 492 | *value = GL_pfd.cRedBits; |
| 493 | break; |
| 494 | case SDL_GL_GREEN_SIZE: |
| 495 | *value = GL_pfd.cGreenBits; |
| 496 | break; |
| 497 | case SDL_GL_BLUE_SIZE: |
| 498 | *value = GL_pfd.cBlueBits; |
| 499 | break; |
| 500 | case SDL_GL_ALPHA_SIZE: |
| 501 | *value = GL_pfd.cAlphaBits; |
| 502 | break; |
| 503 | case SDL_GL_DOUBLEBUFFER: |
| 504 | if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) { |
| 505 | *value = 1; |
| 506 | } else { |
| 507 | *value = 0; |
| 508 | } |
| 509 | break; |
| 510 | case SDL_GL_BUFFER_SIZE: |
| 511 | *value = GL_pfd.cColorBits; |
| 512 | break; |
| 513 | case SDL_GL_DEPTH_SIZE: |
| 514 | *value = GL_pfd.cDepthBits; |
| 515 | break; |
| 516 | case SDL_GL_STENCIL_SIZE: |
| 517 | *value = GL_pfd.cStencilBits; |
| 518 | break; |
| 519 | case SDL_GL_ACCUM_RED_SIZE: |
| 520 | *value = GL_pfd.cAccumRedBits; |
| 521 | break; |
| 522 | case SDL_GL_ACCUM_GREEN_SIZE: |
| 523 | *value = GL_pfd.cAccumGreenBits; |
| 524 | break; |
| 525 | case SDL_GL_ACCUM_BLUE_SIZE: |
| 526 | *value = GL_pfd.cAccumBlueBits; |
| 527 | break; |
| 528 | case SDL_GL_ACCUM_ALPHA_SIZE: |
| 529 | *value = GL_pfd.cAccumAlphaBits; |
| 530 | break; |
| 531 | case SDL_GL_STEREO: |
| 532 | if ( GL_pfd.dwFlags & PFD_STEREO ) { |
| 533 | *value = 1; |
| 534 | } else { |
| 535 | *value = 0; |
| 536 | } |
| 537 | break; |
| 538 | case SDL_GL_MULTISAMPLEBUFFERS: |
| 539 | *value = 0; |
| 540 | break; |
| 541 | case SDL_GL_MULTISAMPLESAMPLES: |
| 542 | *value = 1; |
| 543 | break; |
| 544 | case SDL_GL_SWAP_CONTROL: |
| 545 | if ( this->gl_data->wglGetSwapIntervalEXT ) { |
| 546 | *value = this->gl_data->wglGetSwapIntervalEXT(); |
| 547 | return 0; |
| 548 | } else { |
| 549 | return -1; |
| 550 | } |
| 551 | break; |
| 552 | default: |
| 553 | retval = -1; |
| 554 | break; |
| 555 | } |
| 556 | return retval; |
| 557 | } |
| 558 | |
| 559 | void WIN_GL_SwapBuffers(_THIS) |
| 560 | { |
| 561 | SwapBuffers(GL_hdc); |
| 562 | } |
| 563 | |
| 564 | void WIN_GL_UnloadLibrary(_THIS) |
| 565 | { |
| 566 | if ( this->gl_config.driver_loaded ) { |
| 567 | FreeLibrary((HMODULE)this->gl_config.dll_handle); |
| 568 | |
| 569 | this->gl_data->wglGetProcAddress = NULL; |
| 570 | this->gl_data->wglCreateContext = NULL; |
| 571 | this->gl_data->wglDeleteContext = NULL; |
| 572 | this->gl_data->wglMakeCurrent = NULL; |
| 573 | this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
| 574 | this->gl_data->wglSwapIntervalEXT = NULL; |
| 575 | this->gl_data->wglGetSwapIntervalEXT = NULL; |
| 576 | |
| 577 | this->gl_config.dll_handle = NULL; |
| 578 | this->gl_config.driver_loaded = 0; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* Passing a NULL path means load pointers from the application */ |
| 583 | int WIN_GL_LoadLibrary(_THIS, const char* path) |
| 584 | { |
| 585 | HMODULE handle; |
| 586 | |
| 587 | if ( gl_active ) { |
| 588 | SDL_SetError("OpenGL context already created"); |
| 589 | return -1; |
| 590 | } |
| 591 | |
| 592 | if ( path == NULL ) { |
| 593 | path = DEFAULT_GL_DRIVER_PATH; |
| 594 | } |
| 595 | handle = LoadLibrary(path); |
| 596 | if ( handle == NULL ) { |
| 597 | SDL_SetError("Could not load OpenGL library"); |
| 598 | return -1; |
| 599 | } |
| 600 | |
| 601 | /* Unload the old driver and reset the pointers */ |
| 602 | WIN_GL_UnloadLibrary(this); |
| 603 | |
| 604 | /* Load new function pointers */ |
| 605 | SDL_memset(this->gl_data, 0, sizeof(*this->gl_data)); |
| 606 | this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *)) |
| 607 | GetProcAddress(handle, "wglGetProcAddress"); |
| 608 | this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC)) |
| 609 | GetProcAddress(handle, "wglCreateContext"); |
| 610 | this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC)) |
| 611 | GetProcAddress(handle, "wglDeleteContext"); |
| 612 | this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC)) |
| 613 | GetProcAddress(handle, "wglMakeCurrent"); |
| 614 | this->gl_data->wglSwapIntervalEXT = (void (WINAPI *)(int)) |
| 615 | GetProcAddress(handle, "wglSwapIntervalEXT"); |
| 616 | this->gl_data->wglGetSwapIntervalEXT = (int (WINAPI *)(void)) |
| 617 | GetProcAddress(handle, "wglGetSwapIntervalEXT"); |
| 618 | |
| 619 | if ( (this->gl_data->wglGetProcAddress == NULL) || |
| 620 | (this->gl_data->wglCreateContext == NULL) || |
| 621 | (this->gl_data->wglDeleteContext == NULL) || |
| 622 | (this->gl_data->wglMakeCurrent == NULL) ) { |
| 623 | SDL_SetError("Could not retrieve OpenGL functions"); |
| 624 | FreeLibrary(handle); |
| 625 | return -1; |
| 626 | } |
| 627 | |
| 628 | this->gl_config.dll_handle = handle; |
| 629 | SDL_strlcpy(this->gl_config.driver_path, path, SDL_arraysize(this->gl_config.driver_path)); |
| 630 | this->gl_config.driver_loaded = 1; |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | void *WIN_GL_GetProcAddress(_THIS, const char* proc) |
| 635 | { |
| 636 | void *func; |
| 637 | |
| 638 | /* This is to pick up extensions */ |
| 639 | func = this->gl_data->wglGetProcAddress(proc); |
| 640 | if ( ! func ) { |
| 641 | /* This is probably a normal GL function */ |
| 642 | func = GetProcAddress(this->gl_config.dll_handle, proc); |
| 643 | } |
| 644 | return func; |
| 645 | } |
| 646 | |
| 647 | #endif /* SDL_VIDEO_OPENGL */ |