1 //========================================================================
2 // GLFW 3.3 WGL - www.glfw.org
3 //------------------------------------------------------------------------
4 // Copyright (c) 2002-2006 Marcus Geelnard
5 // Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.org>
6 //
7 // This software is provided 'as-is', without any express or implied
8 // warranty. In no event will the authors be held liable for any damages
9 // arising from the use of this software.
10 //
11 // Permission is granted to anyone to use this software for any purpose,
12 // including commercial applications, and to alter it and redistribute it
13 // freely, subject to the following restrictions:
14 //
15 // 1. The origin of this software must not be misrepresented; you must not
16 // claim that you wrote the original software. If you use this software
17 // in a product, an acknowledgment in the product documentation would
18 // be appreciated but is not required.
19 //
20 // 2. Altered source versions must be plainly marked as such, and must not
21 // be misrepresented as being the original software.
22 //
23 // 3. This notice may not be removed or altered from any source
24 // distribution.
25 //
26 //========================================================================
27
28 #include "internal.h"
29
30 #include <stdlib.h>
31 #include <malloc.h>
32 #include <assert.h>
33
34 // Return the value corresponding to the specified attribute
35 //
findPixelFormatAttribValue(const int * attribs,int attribCount,const int * values,int attrib)36 static int findPixelFormatAttribValue(const int* attribs,
37 int attribCount,
38 const int* values,
39 int attrib)
40 {
41 int i;
42
43 for (i = 0; i < attribCount; i++)
44 {
45 if (attribs[i] == attrib)
46 return values[i];
47 }
48
49 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
50 "WGL: Unknown pixel format attribute requested");
51 return 0;
52 }
53
54 #define addAttrib(a) \
55 { \
56 assert((size_t) attribCount < sizeof(attribs) / sizeof(attribs[0])); \
57 attribs[attribCount++] = a; \
58 }
59 #define findAttribValue(a) \
60 findPixelFormatAttribValue(attribs, attribCount, values, a)
61
62 // Return a list of available and usable framebuffer configs
63 //
choosePixelFormat(_GLFWwindow * window,const _GLFWctxconfig * ctxconfig,const _GLFWfbconfig * fbconfig)64 static int choosePixelFormat(_GLFWwindow* window,
65 const _GLFWctxconfig* ctxconfig,
66 const _GLFWfbconfig* fbconfig)
67 {
68 _GLFWfbconfig* usableConfigs;
69 const _GLFWfbconfig* closest;
70 int i, pixelFormat, nativeCount, usableCount = 0, attribCount = 0;
71 int attribs[40];
72 int values[sizeof(attribs) / sizeof(attribs[0])];
73
74 if (_glfw.wgl.ARB_pixel_format)
75 {
76 const int attrib = WGL_NUMBER_PIXEL_FORMATS_ARB;
77
78 if (!_glfw.wgl.GetPixelFormatAttribivARB(window->context.wgl.dc,
79 1, 0, 1, &attrib, &nativeCount))
80 {
81 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
82 "WGL: Failed to retrieve pixel format attribute");
83 return 0;
84 }
85
86 addAttrib(WGL_SUPPORT_OPENGL_ARB);
87 addAttrib(WGL_DRAW_TO_WINDOW_ARB);
88 addAttrib(WGL_PIXEL_TYPE_ARB);
89 addAttrib(WGL_ACCELERATION_ARB);
90 addAttrib(WGL_RED_BITS_ARB);
91 addAttrib(WGL_RED_SHIFT_ARB);
92 addAttrib(WGL_GREEN_BITS_ARB);
93 addAttrib(WGL_GREEN_SHIFT_ARB);
94 addAttrib(WGL_BLUE_BITS_ARB);
95 addAttrib(WGL_BLUE_SHIFT_ARB);
96 addAttrib(WGL_ALPHA_BITS_ARB);
97 addAttrib(WGL_ALPHA_SHIFT_ARB);
98 addAttrib(WGL_DEPTH_BITS_ARB);
99 addAttrib(WGL_STENCIL_BITS_ARB);
100 addAttrib(WGL_ACCUM_BITS_ARB);
101 addAttrib(WGL_ACCUM_RED_BITS_ARB);
102 addAttrib(WGL_ACCUM_GREEN_BITS_ARB);
103 addAttrib(WGL_ACCUM_BLUE_BITS_ARB);
104 addAttrib(WGL_ACCUM_ALPHA_BITS_ARB);
105 addAttrib(WGL_AUX_BUFFERS_ARB);
106 addAttrib(WGL_STEREO_ARB);
107 addAttrib(WGL_DOUBLE_BUFFER_ARB);
108
109 if (_glfw.wgl.ARB_multisample)
110 addAttrib(WGL_SAMPLES_ARB);
111
112 if (ctxconfig->client == GLFW_OPENGL_API)
113 {
114 if (_glfw.wgl.ARB_framebuffer_sRGB || _glfw.wgl.EXT_framebuffer_sRGB)
115 addAttrib(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB);
116 }
117 else
118 {
119 if (_glfw.wgl.EXT_colorspace)
120 addAttrib(WGL_COLORSPACE_EXT);
121 }
122 }
123 else
124 {
125 nativeCount = DescribePixelFormat(window->context.wgl.dc,
126 1,
127 sizeof(PIXELFORMATDESCRIPTOR),
128 NULL);
129 }
130
131 usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
132
133 for (i = 0; i < nativeCount; i++)
134 {
135 _GLFWfbconfig* u = usableConfigs + usableCount;
136 pixelFormat = i + 1;
137
138 if (_glfw.wgl.ARB_pixel_format)
139 {
140 // Get pixel format attributes through "modern" extension
141
142 if (!_glfw.wgl.GetPixelFormatAttribivARB(window->context.wgl.dc,
143 pixelFormat, 0,
144 attribCount,
145 attribs, values))
146 {
147 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
148 "WGL: Failed to retrieve pixel format attributes");
149
150 free(usableConfigs);
151 return 0;
152 }
153
154 if (!findAttribValue(WGL_SUPPORT_OPENGL_ARB) ||
155 !findAttribValue(WGL_DRAW_TO_WINDOW_ARB))
156 {
157 continue;
158 }
159
160 if (findAttribValue(WGL_PIXEL_TYPE_ARB) != WGL_TYPE_RGBA_ARB)
161 continue;
162
163 if (findAttribValue(WGL_ACCELERATION_ARB) == WGL_NO_ACCELERATION_ARB)
164 continue;
165
166 u->redBits = findAttribValue(WGL_RED_BITS_ARB);
167 u->greenBits = findAttribValue(WGL_GREEN_BITS_ARB);
168 u->blueBits = findAttribValue(WGL_BLUE_BITS_ARB);
169 u->alphaBits = findAttribValue(WGL_ALPHA_BITS_ARB);
170
171 u->depthBits = findAttribValue(WGL_DEPTH_BITS_ARB);
172 u->stencilBits = findAttribValue(WGL_STENCIL_BITS_ARB);
173
174 u->accumRedBits = findAttribValue(WGL_ACCUM_RED_BITS_ARB);
175 u->accumGreenBits = findAttribValue(WGL_ACCUM_GREEN_BITS_ARB);
176 u->accumBlueBits = findAttribValue(WGL_ACCUM_BLUE_BITS_ARB);
177 u->accumAlphaBits = findAttribValue(WGL_ACCUM_ALPHA_BITS_ARB);
178
179 u->auxBuffers = findAttribValue(WGL_AUX_BUFFERS_ARB);
180
181 if (findAttribValue(WGL_STEREO_ARB))
182 u->stereo = GLFW_TRUE;
183 if (findAttribValue(WGL_DOUBLE_BUFFER_ARB))
184 u->doublebuffer = GLFW_TRUE;
185
186 if (_glfw.wgl.ARB_multisample)
187 u->samples = findAttribValue(WGL_SAMPLES_ARB);
188
189 if (ctxconfig->client == GLFW_OPENGL_API)
190 {
191 if (_glfw.wgl.ARB_framebuffer_sRGB ||
192 _glfw.wgl.EXT_framebuffer_sRGB)
193 {
194 if (findAttribValue(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
195 u->sRGB = GLFW_TRUE;
196 }
197 }
198 else
199 {
200 if (_glfw.wgl.EXT_colorspace)
201 {
202 if (findAttribValue(WGL_COLORSPACE_EXT) == WGL_COLORSPACE_SRGB_EXT)
203 u->sRGB = GLFW_TRUE;
204 }
205 }
206 }
207 else
208 {
209 // Get pixel format attributes through legacy PFDs
210
211 PIXELFORMATDESCRIPTOR pfd;
212
213 if (!DescribePixelFormat(window->context.wgl.dc,
214 pixelFormat,
215 sizeof(PIXELFORMATDESCRIPTOR),
216 &pfd))
217 {
218 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
219 "WGL: Failed to describe pixel format");
220
221 free(usableConfigs);
222 return 0;
223 }
224
225 if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
226 !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
227 {
228 continue;
229 }
230
231 if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
232 (pfd.dwFlags & PFD_GENERIC_FORMAT))
233 {
234 continue;
235 }
236
237 if (pfd.iPixelType != PFD_TYPE_RGBA)
238 continue;
239
240 u->redBits = pfd.cRedBits;
241 u->greenBits = pfd.cGreenBits;
242 u->blueBits = pfd.cBlueBits;
243 u->alphaBits = pfd.cAlphaBits;
244
245 u->depthBits = pfd.cDepthBits;
246 u->stencilBits = pfd.cStencilBits;
247
248 u->accumRedBits = pfd.cAccumRedBits;
249 u->accumGreenBits = pfd.cAccumGreenBits;
250 u->accumBlueBits = pfd.cAccumBlueBits;
251 u->accumAlphaBits = pfd.cAccumAlphaBits;
252
253 u->auxBuffers = pfd.cAuxBuffers;
254
255 if (pfd.dwFlags & PFD_STEREO)
256 u->stereo = GLFW_TRUE;
257 if (pfd.dwFlags & PFD_DOUBLEBUFFER)
258 u->doublebuffer = GLFW_TRUE;
259 }
260
261 u->handle = pixelFormat;
262 usableCount++;
263 }
264
265 if (!usableCount)
266 {
267 _glfwInputError(GLFW_API_UNAVAILABLE,
268 "WGL: The driver does not appear to support OpenGL");
269
270 free(usableConfigs);
271 return 0;
272 }
273
274 closest = _glfwChooseFBConfig(fbconfig, usableConfigs, usableCount);
275 if (!closest)
276 {
277 _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
278 "WGL: Failed to find a suitable pixel format");
279
280 free(usableConfigs);
281 return 0;
282 }
283
284 pixelFormat = (int) closest->handle;
285 free(usableConfigs);
286
287 return pixelFormat;
288 }
289
290 #undef addAttrib
291 #undef findAttribValue
292
makeContextCurrentWGL(_GLFWwindow * window)293 static void makeContextCurrentWGL(_GLFWwindow* window)
294 {
295 if (window)
296 {
297 if (wglMakeCurrent(window->context.wgl.dc, window->context.wgl.handle))
298 _glfwPlatformSetTls(&_glfw.contextSlot, window);
299 else
300 {
301 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
302 "WGL: Failed to make context current");
303 _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
304 }
305 }
306 else
307 {
308 if (!wglMakeCurrent(NULL, NULL))
309 {
310 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
311 "WGL: Failed to clear current context");
312 }
313
314 _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
315 }
316 }
317
swapBuffersWGL(_GLFWwindow * window)318 static void swapBuffersWGL(_GLFWwindow* window)
319 {
320 if (!window->monitor)
321 {
322 if (IsWindowsVistaOrGreater())
323 {
324 // DWM Composition is always enabled on Win8+
325 BOOL enabled = IsWindows8OrGreater();
326
327 // HACK: Use DwmFlush when desktop composition is enabled
328 if (enabled ||
329 (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
330 {
331 int count = abs(window->context.wgl.interval);
332 while (count--)
333 DwmFlush();
334 }
335 }
336 }
337
338 SwapBuffers(window->context.wgl.dc);
339 }
340
swapIntervalWGL(int interval)341 static void swapIntervalWGL(int interval)
342 {
343 _GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
344
345 window->context.wgl.interval = interval;
346
347 if (!window->monitor)
348 {
349 if (IsWindowsVistaOrGreater())
350 {
351 // DWM Composition is always enabled on Win8+
352 BOOL enabled = IsWindows8OrGreater();
353
354 // HACK: Disable WGL swap interval when desktop composition is enabled to
355 // avoid interfering with DWM vsync
356 if (enabled ||
357 (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
358 interval = 0;
359 }
360 }
361
362 if (_glfw.wgl.EXT_swap_control)
363 _glfw.wgl.SwapIntervalEXT(interval);
364 }
365
extensionSupportedWGL(const char * extension)366 static int extensionSupportedWGL(const char* extension)
367 {
368 const char* extensions = NULL;
369
370 if (_glfw.wgl.GetExtensionsStringARB)
371 extensions = _glfw.wgl.GetExtensionsStringARB(wglGetCurrentDC());
372 else if (_glfw.wgl.GetExtensionsStringEXT)
373 extensions = _glfw.wgl.GetExtensionsStringEXT();
374
375 if (!extensions)
376 return GLFW_FALSE;
377
378 return _glfwStringInExtensionString(extension, extensions);
379 }
380
getProcAddressWGL(const char * procname)381 static GLFWglproc getProcAddressWGL(const char* procname)
382 {
383 const GLFWglproc proc = (GLFWglproc) wglGetProcAddress(procname);
384 if (proc)
385 return proc;
386
387 return (GLFWglproc) GetProcAddress(_glfw.wgl.instance, procname);
388 }
389
390 // Destroy the OpenGL context
391 //
destroyContextWGL(_GLFWwindow * window)392 static void destroyContextWGL(_GLFWwindow* window)
393 {
394 if (window->context.wgl.handle)
395 {
396 wglDeleteContext(window->context.wgl.handle);
397 window->context.wgl.handle = NULL;
398 }
399 }
400
401
402 //////////////////////////////////////////////////////////////////////////
403 ////// GLFW internal API //////
404 //////////////////////////////////////////////////////////////////////////
405
406 // Initialize WGL
407 //
_glfwInitWGL(void)408 GLFWbool _glfwInitWGL(void)
409 {
410 PIXELFORMATDESCRIPTOR pfd;
411 HGLRC prc, rc;
412 HDC pdc, dc;
413
414 if (_glfw.wgl.instance)
415 return GLFW_TRUE;
416
417 _glfw.wgl.instance = LoadLibraryA("opengl32.dll");
418 if (!_glfw.wgl.instance)
419 {
420 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
421 "WGL: Failed to load opengl32.dll");
422 return GLFW_FALSE;
423 }
424
425 _glfw.wgl.CreateContext = (PFN_wglCreateContext)
426 GetProcAddress(_glfw.wgl.instance, "wglCreateContext");
427 _glfw.wgl.DeleteContext = (PFN_wglDeleteContext)
428 GetProcAddress(_glfw.wgl.instance, "wglDeleteContext");
429 _glfw.wgl.GetProcAddress = (PFN_wglGetProcAddress)
430 GetProcAddress(_glfw.wgl.instance, "wglGetProcAddress");
431 _glfw.wgl.GetCurrentDC = (PFN_wglGetCurrentDC)
432 GetProcAddress(_glfw.wgl.instance, "wglGetCurrentDC");
433 _glfw.wgl.GetCurrentContext = (PFN_wglGetCurrentContext)
434 GetProcAddress(_glfw.wgl.instance, "wglGetCurrentContext");
435 _glfw.wgl.MakeCurrent = (PFN_wglMakeCurrent)
436 GetProcAddress(_glfw.wgl.instance, "wglMakeCurrent");
437 _glfw.wgl.ShareLists = (PFN_wglShareLists)
438 GetProcAddress(_glfw.wgl.instance, "wglShareLists");
439
440 // NOTE: A dummy context has to be created for opengl32.dll to load the
441 // OpenGL ICD, from which we can then query WGL extensions
442 // NOTE: This code will accept the Microsoft GDI ICD; accelerated context
443 // creation failure occurs during manual pixel format enumeration
444
445 dc = GetDC(_glfw.win32.helperWindowHandle);
446
447 ZeroMemory(&pfd, sizeof(pfd));
448 pfd.nSize = sizeof(pfd);
449 pfd.nVersion = 1;
450 pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
451 pfd.iPixelType = PFD_TYPE_RGBA;
452 pfd.cColorBits = 24;
453
454 if (!SetPixelFormat(dc, ChoosePixelFormat(dc, &pfd), &pfd))
455 {
456 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
457 "WGL: Failed to set pixel format for dummy context");
458 return GLFW_FALSE;
459 }
460
461 rc = wglCreateContext(dc);
462 if (!rc)
463 {
464 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
465 "WGL: Failed to create dummy context");
466 return GLFW_FALSE;
467 }
468
469 pdc = wglGetCurrentDC();
470 prc = wglGetCurrentContext();
471
472 if (!wglMakeCurrent(dc, rc))
473 {
474 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
475 "WGL: Failed to make dummy context current");
476 wglMakeCurrent(pdc, prc);
477 wglDeleteContext(rc);
478 return GLFW_FALSE;
479 }
480
481 // NOTE: Functions must be loaded first as they're needed to retrieve the
482 // extension string that tells us whether the functions are supported
483 _glfw.wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)
484 wglGetProcAddress("wglGetExtensionsStringEXT");
485 _glfw.wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)
486 wglGetProcAddress("wglGetExtensionsStringARB");
487 _glfw.wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)
488 wglGetProcAddress("wglCreateContextAttribsARB");
489 _glfw.wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)
490 wglGetProcAddress("wglSwapIntervalEXT");
491 _glfw.wgl.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC)
492 wglGetProcAddress("wglGetPixelFormatAttribivARB");
493
494 // NOTE: WGL_ARB_extensions_string and WGL_EXT_extensions_string are not
495 // checked below as we are already using them
496 _glfw.wgl.ARB_multisample =
497 extensionSupportedWGL("WGL_ARB_multisample");
498 _glfw.wgl.ARB_framebuffer_sRGB =
499 extensionSupportedWGL("WGL_ARB_framebuffer_sRGB");
500 _glfw.wgl.EXT_framebuffer_sRGB =
501 extensionSupportedWGL("WGL_EXT_framebuffer_sRGB");
502 _glfw.wgl.ARB_create_context =
503 extensionSupportedWGL("WGL_ARB_create_context");
504 _glfw.wgl.ARB_create_context_profile =
505 extensionSupportedWGL("WGL_ARB_create_context_profile");
506 _glfw.wgl.EXT_create_context_es2_profile =
507 extensionSupportedWGL("WGL_EXT_create_context_es2_profile");
508 _glfw.wgl.ARB_create_context_robustness =
509 extensionSupportedWGL("WGL_ARB_create_context_robustness");
510 _glfw.wgl.ARB_create_context_no_error =
511 extensionSupportedWGL("WGL_ARB_create_context_no_error");
512 _glfw.wgl.EXT_swap_control =
513 extensionSupportedWGL("WGL_EXT_swap_control");
514 _glfw.wgl.EXT_colorspace =
515 extensionSupportedWGL("WGL_EXT_colorspace");
516 _glfw.wgl.ARB_pixel_format =
517 extensionSupportedWGL("WGL_ARB_pixel_format");
518 _glfw.wgl.ARB_context_flush_control =
519 extensionSupportedWGL("WGL_ARB_context_flush_control");
520
521 wglMakeCurrent(pdc, prc);
522 wglDeleteContext(rc);
523 return GLFW_TRUE;
524 }
525
526 // Terminate WGL
527 //
_glfwTerminateWGL(void)528 void _glfwTerminateWGL(void)
529 {
530 if (_glfw.wgl.instance)
531 FreeLibrary(_glfw.wgl.instance);
532 }
533
534 #define setAttrib(a, v) \
535 { \
536 assert(((size_t) index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
537 attribs[index++] = a; \
538 attribs[index++] = v; \
539 }
540
541 // Create the OpenGL or OpenGL ES context
542 //
_glfwCreateContextWGL(_GLFWwindow * window,const _GLFWctxconfig * ctxconfig,const _GLFWfbconfig * fbconfig)543 GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
544 const _GLFWctxconfig* ctxconfig,
545 const _GLFWfbconfig* fbconfig)
546 {
547 int attribs[40];
548 int pixelFormat;
549 PIXELFORMATDESCRIPTOR pfd;
550 HGLRC share = NULL;
551
552 if (ctxconfig->share)
553 share = ctxconfig->share->context.wgl.handle;
554
555 window->context.wgl.dc = GetDC(window->win32.handle);
556 if (!window->context.wgl.dc)
557 {
558 _glfwInputError(GLFW_PLATFORM_ERROR,
559 "WGL: Failed to retrieve DC for window");
560 return GLFW_FALSE;
561 }
562
563 pixelFormat = choosePixelFormat(window, ctxconfig, fbconfig);
564 if (!pixelFormat)
565 return GLFW_FALSE;
566
567 if (!DescribePixelFormat(window->context.wgl.dc,
568 pixelFormat, sizeof(pfd), &pfd))
569 {
570 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
571 "WGL: Failed to retrieve PFD for selected pixel format");
572 return GLFW_FALSE;
573 }
574
575 if (!SetPixelFormat(window->context.wgl.dc, pixelFormat, &pfd))
576 {
577 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
578 "WGL: Failed to set selected pixel format");
579 return GLFW_FALSE;
580 }
581
582 if (ctxconfig->client == GLFW_OPENGL_API)
583 {
584 if (ctxconfig->forward)
585 {
586 if (!_glfw.wgl.ARB_create_context)
587 {
588 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
589 "WGL: A forward compatible OpenGL context requested but WGL_ARB_create_context is unavailable");
590 return GLFW_FALSE;
591 }
592 }
593
594 if (ctxconfig->profile)
595 {
596 if (!_glfw.wgl.ARB_create_context_profile)
597 {
598 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
599 "WGL: OpenGL profile requested but WGL_ARB_create_context_profile is unavailable");
600 return GLFW_FALSE;
601 }
602 }
603 }
604 else
605 {
606 if (!_glfw.wgl.ARB_create_context ||
607 !_glfw.wgl.ARB_create_context_profile ||
608 !_glfw.wgl.EXT_create_context_es2_profile)
609 {
610 _glfwInputError(GLFW_API_UNAVAILABLE,
611 "WGL: OpenGL ES requested but WGL_ARB_create_context_es2_profile is unavailable");
612 return GLFW_FALSE;
613 }
614 }
615
616 if (_glfw.wgl.ARB_create_context)
617 {
618 int index = 0, mask = 0, flags = 0;
619
620 if (ctxconfig->client == GLFW_OPENGL_API)
621 {
622 if (ctxconfig->forward)
623 flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
624
625 if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)
626 mask |= WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
627 else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
628 mask |= WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
629 }
630 else
631 mask |= WGL_CONTEXT_ES2_PROFILE_BIT_EXT;
632
633 if (ctxconfig->debug)
634 flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
635
636 if (ctxconfig->robustness)
637 {
638 if (_glfw.wgl.ARB_create_context_robustness)
639 {
640 if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
641 {
642 setAttrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
643 WGL_NO_RESET_NOTIFICATION_ARB);
644 }
645 else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
646 {
647 setAttrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
648 WGL_LOSE_CONTEXT_ON_RESET_ARB);
649 }
650
651 flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB;
652 }
653 }
654
655 if (ctxconfig->release)
656 {
657 if (_glfw.wgl.ARB_context_flush_control)
658 {
659 if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_NONE)
660 {
661 setAttrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
662 WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB);
663 }
664 else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)
665 {
666 setAttrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
667 WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB);
668 }
669 }
670 }
671
672 if (ctxconfig->noerror)
673 {
674 if (_glfw.wgl.ARB_create_context_no_error)
675 setAttrib(WGL_CONTEXT_OPENGL_NO_ERROR_ARB, GLFW_TRUE);
676 }
677
678 // NOTE: Only request an explicitly versioned context when necessary, as
679 // explicitly requesting version 1.0 does not always return the
680 // highest version supported by the driver
681 if (ctxconfig->major != 1 || ctxconfig->minor != 0)
682 {
683 setAttrib(WGL_CONTEXT_MAJOR_VERSION_ARB, ctxconfig->major);
684 setAttrib(WGL_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor);
685 }
686
687 if (flags)
688 setAttrib(WGL_CONTEXT_FLAGS_ARB, flags);
689
690 if (mask)
691 setAttrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask);
692
693 setAttrib(0, 0);
694
695 window->context.wgl.handle =
696 _glfw.wgl.CreateContextAttribsARB(window->context.wgl.dc,
697 share, attribs);
698 if (!window->context.wgl.handle)
699 {
700 const DWORD error = GetLastError();
701
702 if (error == (0xc0070000 | ERROR_INVALID_VERSION_ARB))
703 {
704 if (ctxconfig->client == GLFW_OPENGL_API)
705 {
706 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
707 "WGL: Driver does not support OpenGL version %i.%i",
708 ctxconfig->major,
709 ctxconfig->minor);
710 }
711 else
712 {
713 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
714 "WGL: Driver does not support OpenGL ES version %i.%i",
715 ctxconfig->major,
716 ctxconfig->minor);
717 }
718 }
719 else if (error == (0xc0070000 | ERROR_INVALID_PROFILE_ARB))
720 {
721 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
722 "WGL: Driver does not support the requested OpenGL profile");
723 }
724 else if (error == (0xc0070000 | ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB))
725 {
726 _glfwInputError(GLFW_INVALID_VALUE,
727 "WGL: The share context is not compatible with the requested context");
728 }
729 else
730 {
731 if (ctxconfig->client == GLFW_OPENGL_API)
732 {
733 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
734 "WGL: Failed to create OpenGL context");
735 }
736 else
737 {
738 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
739 "WGL: Failed to create OpenGL ES context");
740 }
741 }
742
743 return GLFW_FALSE;
744 }
745 }
746 else
747 {
748 window->context.wgl.handle = wglCreateContext(window->context.wgl.dc);
749 if (!window->context.wgl.handle)
750 {
751 _glfwInputErrorWin32(GLFW_VERSION_UNAVAILABLE,
752 "WGL: Failed to create OpenGL context");
753 return GLFW_FALSE;
754 }
755
756 if (share)
757 {
758 if (!wglShareLists(share, window->context.wgl.handle))
759 {
760 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
761 "WGL: Failed to enable sharing with specified OpenGL context");
762 return GLFW_FALSE;
763 }
764 }
765 }
766
767 window->context.makeCurrent = makeContextCurrentWGL;
768 window->context.swapBuffers = swapBuffersWGL;
769 window->context.swapInterval = swapIntervalWGL;
770 window->context.extensionSupported = extensionSupportedWGL;
771 window->context.getProcAddress = getProcAddressWGL;
772 window->context.destroy = destroyContextWGL;
773
774 return GLFW_TRUE;
775 }
776
777 #undef setAttrib
778
779
780 //////////////////////////////////////////////////////////////////////////
781 ////// GLFW native API //////
782 //////////////////////////////////////////////////////////////////////////
783
glfwGetWGLContext(GLFWwindow * handle)784 GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle)
785 {
786 _GLFWwindow* window = (_GLFWwindow*) handle;
787 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
788
789 if (window->context.client == GLFW_NO_API)
790 {
791 _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
792 return NULL;
793 }
794
795 return window->context.wgl.handle;
796 }
797
798