e14743d1 |
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 */ |