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comparison src/video/win32/SDL_win32opengl.c @ 2178:114a541cfae2

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Creating a context makes it current, per the documentation. Applied a variant of the multi-card OpenGL fix from SDL 1.2
author Sam Lantinga <slouken@libsdl.org>
date Thu, 12 Jul 2007 06:31:36 +0000
parents abbe2c1dcf0a
children 5ed37b16c1a7
comparison
equal deleted inserted replaced
2177:4f896c20caf6 2178:114a541cfae2
290 } 290 }
291 return SDL_FALSE; 291 return SDL_FALSE;
292 } 292 }
293 293
294 static void 294 static void
295 WIN_GL_InitExtensions(_THIS) 295 WIN_GL_InitExtensions(_THIS, HDC hdc)
296 { 296 {
297 HWND hwnd;
298 HDC hdc;
299 PIXELFORMATDESCRIPTOR pfd;
300 int pixel_format;
301 HGLRC hglrc;
302 const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0; 297 const char *(WINAPI * wglGetExtensionsStringARB) (HDC) = 0;
303 const char *extensions; 298 const char *extensions;
304
305 hwnd =
306 CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
307 10, 10, NULL, NULL, SDL_Instance, NULL);
308 WIN_PumpEvents(_this);
309
310 hdc = GetDC(hwnd);
311
312 WIN_GL_SetupPixelFormat(_this, &pfd);
313 pixel_format = ChoosePixelFormat(hdc, &pfd);
314 SetPixelFormat(hdc, pixel_format, &pfd);
315
316 hglrc = _this->gl_data->wglCreateContext(hdc);
317 if (hglrc) {
318 _this->gl_data->wglMakeCurrent(hdc, hglrc);
319 }
320 299
321 wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC)) 300 wglGetExtensionsStringARB = (const char *(WINAPI *) (HDC))
322 _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB"); 301 _this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB");
323 if (wglGetExtensionsStringARB) { 302 if (wglGetExtensionsStringARB) {
324 extensions = wglGetExtensionsStringARB(hdc); 303 extensions = wglGetExtensionsStringARB(hdc);
348 if (HasExtension("WGL_EXT_swap_control", extensions)) { 327 if (HasExtension("WGL_EXT_swap_control", extensions)) {
349 _this->gl_data->wglSwapIntervalEXT = 328 _this->gl_data->wglSwapIntervalEXT =
350 WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT"); 329 WIN_GL_GetProcAddress(_this, "wglSwapIntervalEXT");
351 _this->gl_data->wglGetSwapIntervalEXT = 330 _this->gl_data->wglGetSwapIntervalEXT =
352 WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT"); 331 WIN_GL_GetProcAddress(_this, "wglGetSwapIntervalEXT");
353 } 332 } else {
354 333 _this->gl_data->wglSwapIntervalEXT = NULL;
334 _this->gl_data->wglGetSwapIntervalEXT = NULL;
335 }
336 }
337
338 static int
339 WIN_GL_ChoosePixelFormatARB(_THIS, int *iAttribs, float *fAttribs)
340 {
341 HWND hwnd;
342 HDC hdc;
343 HGLRC hglrc;
344 int pixel_format = 0;
345 unsigned int matching;
346
347 hwnd =
348 CreateWindow(SDL_Appname, SDL_Appname, (WS_POPUP | WS_DISABLED), 0, 0,
349 10, 10, NULL, NULL, SDL_Instance, NULL);
350 WIN_PumpEvents(_this);
351
352 hdc = GetDC(hwnd);
353
354 hglrc = _this->gl_data->wglCreateContext(hdc);
355 if (hglrc) { 355 if (hglrc) {
356 _this->gl_data->wglMakeCurrent(hdc, hglrc);
357
358 WIN_GL_InitExtensions(_this, hdc);
359
360 if (_this->gl_data->WGL_ARB_pixel_format) {
361 _this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs,
362 1, &pixel_format,
363 &matching);
364 }
365
356 _this->gl_data->wglMakeCurrent(NULL, NULL); 366 _this->gl_data->wglMakeCurrent(NULL, NULL);
357 _this->gl_data->wglDeleteContext(hglrc); 367 _this->gl_data->wglDeleteContext(hglrc);
358 } 368 }
359 ReleaseDC(hwnd, hdc); 369 ReleaseDC(hwnd, hdc);
360 DestroyWindow(hwnd); 370 DestroyWindow(hwnd);
361 WIN_PumpEvents(_this); 371 WIN_PumpEvents(_this);
372
373 return pixel_format;
362 } 374 }
363 375
364 static int 376 static int
365 WIN_GL_Initialize(_THIS) 377 WIN_GL_Initialize(_THIS)
366 { 378 {
381 393
382 if (WIN_GL_LoadLibrary(_this, NULL) < 0) { 394 if (WIN_GL_LoadLibrary(_this, NULL) < 0) {
383 return -1; 395 return -1;
384 } 396 }
385 397
386 /* Initialize extensions */
387 WIN_GL_InitExtensions(_this);
388
389 return 0; 398 return 0;
390 } 399 }
391 400
392 static void 401 static void
393 WIN_GL_Shutdown(_THIS) 402 WIN_GL_Shutdown(_THIS)
406 WIN_GL_SetupWindow(_THIS, SDL_Window * window) 415 WIN_GL_SetupWindow(_THIS, SDL_Window * window)
407 { 416 {
408 HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc; 417 HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
409 PIXELFORMATDESCRIPTOR pfd; 418 PIXELFORMATDESCRIPTOR pfd;
410 int pixel_format; 419 int pixel_format;
411 unsigned int matching;
412 int iAttribs[64]; 420 int iAttribs[64];
413 int *iAttr; 421 int *iAttr;
414 float fAttribs[1] = { 0 }; 422 float fAttribs[1] = { 0 };
415 423
416 if (WIN_GL_Initialize(_this) < 0) { 424 if (WIN_GL_Initialize(_this) < 0) {
493 } 501 }
494 502
495 *iAttr = 0; 503 *iAttr = 0;
496 504
497 /* Choose and set the closest available pixel format */ 505 /* Choose and set the closest available pixel format */
498 if (!_this->gl_data->WGL_ARB_pixel_format 506 pixel_format = WIN_GL_ChoosePixelFormatARB(_this, iAttribs, fAttribs);
499 || !_this->gl_data->wglChoosePixelFormatARB(hdc, iAttribs, fAttribs, 507 if (!pixel_format) {
500 1, &pixel_format,
501 &matching) || !matching) {
502 pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd); 508 pixel_format = WIN_GL_ChoosePixelFormat(hdc, &pfd);
503 } 509 }
504 if (!pixel_format) { 510 if (!pixel_format) {
505 SDL_SetError("No matching GL pixel format available"); 511 SDL_SetError("No matching GL pixel format available");
506 return -1; 512 return -1;
520 526
521 SDL_GLContext 527 SDL_GLContext
522 WIN_GL_CreateContext(_THIS, SDL_Window * window) 528 WIN_GL_CreateContext(_THIS, SDL_Window * window)
523 { 529 {
524 HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc; 530 HDC hdc = ((SDL_WindowData *) window->driverdata)->hdc;
525 531 HGLRC context;
526 return _this->gl_data->wglCreateContext(hdc); 532
533 context = _this->gl_data->wglCreateContext(hdc);
534 if (!context) {
535 SDL_SetError("Could not create GL context");
536 return NULL;
537 }
538
539 if (WIN_GL_MakeCurrent(_this, window, context) < 0) {
540 WIN_GL_DeleteContext(_this, context);
541 return NULL;
542 }
543
544 WIN_GL_InitExtensions(_this, hdc);
545
546 return context;
527 } 547 }
528 548
529 int 549 int
530 WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context) 550 WIN_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
531 { 551 {