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cpputils / deps / glfw / src / wgl_context.c
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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// Please use C89 style variable declarations in this file because VS 2010
28//========================================================================
29
30#include "internal.h"
31
32#include <stdlib.h>
33#include <malloc.h>
34#include <assert.h>
35
36// Return the value corresponding to the specified attribute
37//
38static int findPixelFormatAttribValue(const int* attribs,
39 int attribCount,
40 const int* values,
41 int attrib)
42{
43 int i;
44
45 for (i = 0; i < attribCount; i++)
46 {
47 if (attribs[i] == attrib)
48 return values[i];
49 }
50
51 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
52 "WGL: Unknown pixel format attribute requested");
53 return 0;
54}
55
56#define addAttrib(a) \
57{ \
58 assert((size_t) attribCount < sizeof(attribs) / sizeof(attribs[0])); \
59 attribs[attribCount++] = a; \
60}
61#define findAttribValue(a) \
62 findPixelFormatAttribValue(attribs, attribCount, values, a)
63
64// Return a list of available and usable framebuffer configs
65//
66static int choosePixelFormat(_GLFWwindow* window,
67 const _GLFWctxconfig* ctxconfig,
68 const _GLFWfbconfig* fbconfig)
69{
70 _GLFWfbconfig* usableConfigs;
71 const _GLFWfbconfig* closest;
72 int i, pixelFormat, nativeCount, usableCount = 0, attribCount = 0;
73 int attribs[40];
74 int values[sizeof(attribs) / sizeof(attribs[0])];
75
76 if (_glfw.wgl.ARB_pixel_format)
77 {
78 const int attrib = WGL_NUMBER_PIXEL_FORMATS_ARB;
79
80 if (!wglGetPixelFormatAttribivARB(window->context.wgl.dc,
81 1, 0, 1, &attrib, &nativeCount))
82 {
83 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
84 "WGL: Failed to retrieve pixel format attribute");
85 return 0;
86 }
87
88 addAttrib(WGL_SUPPORT_OPENGL_ARB);
89 addAttrib(WGL_DRAW_TO_WINDOW_ARB);
90 addAttrib(WGL_PIXEL_TYPE_ARB);
91 addAttrib(WGL_ACCELERATION_ARB);
92 addAttrib(WGL_RED_BITS_ARB);
93 addAttrib(WGL_RED_SHIFT_ARB);
94 addAttrib(WGL_GREEN_BITS_ARB);
95 addAttrib(WGL_GREEN_SHIFT_ARB);
96 addAttrib(WGL_BLUE_BITS_ARB);
97 addAttrib(WGL_BLUE_SHIFT_ARB);
98 addAttrib(WGL_ALPHA_BITS_ARB);
99 addAttrib(WGL_ALPHA_SHIFT_ARB);
100 addAttrib(WGL_DEPTH_BITS_ARB);
101 addAttrib(WGL_STENCIL_BITS_ARB);
102 addAttrib(WGL_ACCUM_BITS_ARB);
103 addAttrib(WGL_ACCUM_RED_BITS_ARB);
104 addAttrib(WGL_ACCUM_GREEN_BITS_ARB);
105 addAttrib(WGL_ACCUM_BLUE_BITS_ARB);
106 addAttrib(WGL_ACCUM_ALPHA_BITS_ARB);
107 addAttrib(WGL_AUX_BUFFERS_ARB);
108 addAttrib(WGL_STEREO_ARB);
109 addAttrib(WGL_DOUBLE_BUFFER_ARB);
110
111 if (_glfw.wgl.ARB_multisample)
112 addAttrib(WGL_SAMPLES_ARB);
113
114 if (ctxconfig->client == GLFW_OPENGL_API)
115 {
116 if (_glfw.wgl.ARB_framebuffer_sRGB || _glfw.wgl.EXT_framebuffer_sRGB)
117 addAttrib(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB);
118 }
119 else
120 {
121 if (_glfw.wgl.EXT_colorspace)
122 addAttrib(WGL_COLORSPACE_EXT);
123 }
124 }
125 else
126 {
127 nativeCount = DescribePixelFormat(window->context.wgl.dc,
128 1,
129 sizeof(PIXELFORMATDESCRIPTOR),
130 NULL);
131 }
132
133 usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
134
135 for (i = 0; i < nativeCount; i++)
136 {
137 _GLFWfbconfig* u = usableConfigs + usableCount;
138 pixelFormat = i + 1;
139
140 if (_glfw.wgl.ARB_pixel_format)
141 {
142 // Get pixel format attributes through "modern" extension
143
144 if (!wglGetPixelFormatAttribivARB(window->context.wgl.dc,
145 pixelFormat, 0,
146 attribCount,
147 attribs, values))
148 {
149 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
150 "WGL: Failed to retrieve pixel format attributes");
151
152 free(usableConfigs);
153 return 0;
154 }
155
156 if (!findAttribValue(WGL_SUPPORT_OPENGL_ARB) ||
157 !findAttribValue(WGL_DRAW_TO_WINDOW_ARB))
158 {
159 continue;
160 }
161
162 if (findAttribValue(WGL_PIXEL_TYPE_ARB) != WGL_TYPE_RGBA_ARB)
163 continue;
164
165 if (findAttribValue(WGL_ACCELERATION_ARB) == WGL_NO_ACCELERATION_ARB)
166 continue;
167
168 u->redBits = findAttribValue(WGL_RED_BITS_ARB);
169 u->greenBits = findAttribValue(WGL_GREEN_BITS_ARB);
170 u->blueBits = findAttribValue(WGL_BLUE_BITS_ARB);
171 u->alphaBits = findAttribValue(WGL_ALPHA_BITS_ARB);
172
173 u->depthBits = findAttribValue(WGL_DEPTH_BITS_ARB);
174 u->stencilBits = findAttribValue(WGL_STENCIL_BITS_ARB);
175
176 u->accumRedBits = findAttribValue(WGL_ACCUM_RED_BITS_ARB);
177 u->accumGreenBits = findAttribValue(WGL_ACCUM_GREEN_BITS_ARB);
178 u->accumBlueBits = findAttribValue(WGL_ACCUM_BLUE_BITS_ARB);
179 u->accumAlphaBits = findAttribValue(WGL_ACCUM_ALPHA_BITS_ARB);
180
181 u->auxBuffers = findAttribValue(WGL_AUX_BUFFERS_ARB);
182
183 if (findAttribValue(WGL_STEREO_ARB))
184 u->stereo = GLFW_TRUE;
185 if (findAttribValue(WGL_DOUBLE_BUFFER_ARB))
186 u->doublebuffer = GLFW_TRUE;
187
188 if (_glfw.wgl.ARB_multisample)
189 u->samples = findAttribValue(WGL_SAMPLES_ARB);
190
191 if (ctxconfig->client == GLFW_OPENGL_API)
192 {
193 if (_glfw.wgl.ARB_framebuffer_sRGB ||
194 _glfw.wgl.EXT_framebuffer_sRGB)
195 {
196 if (findAttribValue(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
197 u->sRGB = GLFW_TRUE;
198 }
199 }
200 else
201 {
202 if (_glfw.wgl.EXT_colorspace)
203 {
204 if (findAttribValue(WGL_COLORSPACE_EXT) == WGL_COLORSPACE_SRGB_EXT)
205 u->sRGB = GLFW_TRUE;
206 }
207 }
208 }
209 else
210 {
211 // Get pixel format attributes through legacy PFDs
212
213 PIXELFORMATDESCRIPTOR pfd;
214
215 if (!DescribePixelFormat(window->context.wgl.dc,
216 pixelFormat,
217 sizeof(PIXELFORMATDESCRIPTOR),
218 &pfd))
219 {
220 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
221 "WGL: Failed to describe pixel format");
222
223 free(usableConfigs);
224 return 0;
225 }
226
227 if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
228 !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
229 {
230 continue;
231 }
232
233 if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
234 (pfd.dwFlags & PFD_GENERIC_FORMAT))
235 {
236 continue;
237 }
238
239 if (pfd.iPixelType != PFD_TYPE_RGBA)
240 continue;
241
242 u->redBits = pfd.cRedBits;
243 u->greenBits = pfd.cGreenBits;
244 u->blueBits = pfd.cBlueBits;
245 u->alphaBits = pfd.cAlphaBits;
246
247 u->depthBits = pfd.cDepthBits;
248 u->stencilBits = pfd.cStencilBits;
249
250 u->accumRedBits = pfd.cAccumRedBits;
251 u->accumGreenBits = pfd.cAccumGreenBits;
252 u->accumBlueBits = pfd.cAccumBlueBits;
253 u->accumAlphaBits = pfd.cAccumAlphaBits;
254
255 u->auxBuffers = pfd.cAuxBuffers;
256
257 if (pfd.dwFlags & PFD_STEREO)
258 u->stereo = GLFW_TRUE;
259 if (pfd.dwFlags & PFD_DOUBLEBUFFER)
260 u->doublebuffer = GLFW_TRUE;
261 }
262
263 u->handle = pixelFormat;
264 usableCount++;
265 }
266
267 if (!usableCount)
268 {
269 _glfwInputError(GLFW_API_UNAVAILABLE,
270 "WGL: The driver does not appear to support OpenGL");
271
272 free(usableConfigs);
273 return 0;
274 }
275
276 closest = _glfwChooseFBConfig(fbconfig, usableConfigs, usableCount);
277 if (!closest)
278 {
279 _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
280 "WGL: Failed to find a suitable pixel format");
281
282 free(usableConfigs);
283 return 0;
284 }
285
286 pixelFormat = (int) closest->handle;
287 free(usableConfigs);
288
289 return pixelFormat;
290}
291
292#undef addAttrib
293#undef findAttribValue
294
295static void makeContextCurrentWGL(_GLFWwindow* window)
296{
297 if (window)
298 {
299 if (wglMakeCurrent(window->context.wgl.dc, window->context.wgl.handle))
300 _glfwPlatformSetTls(&_glfw.contextSlot, window);
301 else
302 {
303 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
304 "WGL: Failed to make context current");
305 _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
306 }
307 }
308 else
309 {
310 if (!wglMakeCurrent(NULL, NULL))
311 {
312 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
313 "WGL: Failed to clear current context");
314 }
315
316 _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
317 }
318}
319
320static void swapBuffersWGL(_GLFWwindow* window)
321{
322 if (!window->monitor)
323 {
324 if (IsWindowsVistaOrGreater())
325 {
326 // DWM Composition is always enabled on Win8+
327 BOOL enabled = IsWindows8OrGreater();
328
329 // HACK: Use DwmFlush when desktop composition is enabled
330 if (enabled ||
331 (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
332 {
333 int count = abs(window->context.wgl.interval);
334 while (count--)
335 DwmFlush();
336 }
337 }
338 }
339
340 SwapBuffers(window->context.wgl.dc);
341}
342
343static void swapIntervalWGL(int interval)
344{
345 _GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
346
347 window->context.wgl.interval = interval;
348
349 if (!window->monitor)
350 {
351 if (IsWindowsVistaOrGreater())
352 {
353 // DWM Composition is always enabled on Win8+
354 BOOL enabled = IsWindows8OrGreater();
355
356 // HACK: Disable WGL swap interval when desktop composition is enabled to
357 // avoid interfering with DWM vsync
358 if (enabled ||
359 (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
360 interval = 0;
361 }
362 }
363
364 if (_glfw.wgl.EXT_swap_control)
365 wglSwapIntervalEXT(interval);
366}
367
368static int extensionSupportedWGL(const char* extension)
369{
370 const char* extensions = NULL;
371
372 if (_glfw.wgl.GetExtensionsStringARB)
373 extensions = wglGetExtensionsStringARB(wglGetCurrentDC());
374 else if (_glfw.wgl.GetExtensionsStringEXT)
375 extensions = wglGetExtensionsStringEXT();
376
377 if (!extensions)
378 return GLFW_FALSE;
379
380 return _glfwStringInExtensionString(extension, extensions);
381}
382
383static GLFWglproc getProcAddressWGL(const char* procname)
384{
385 const GLFWglproc proc = (GLFWglproc) wglGetProcAddress(procname);
386 if (proc)
387 return proc;
388
389 return (GLFWglproc) GetProcAddress(_glfw.wgl.instance, procname);
390}
391
392static 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//
408GLFWbool _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//
528void _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//
543GLFWbool _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 wglCreateContextAttribsARB(window->context.wgl.dc, share, attribs);
697 if (!window->context.wgl.handle)
698 {
699 const DWORD error = GetLastError();
700
701 if (error == (0xc0070000 | ERROR_INVALID_VERSION_ARB))
702 {
703 if (ctxconfig->client == GLFW_OPENGL_API)
704 {
705 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
706 "WGL: Driver does not support OpenGL version %i.%i",
707 ctxconfig->major,
708 ctxconfig->minor);
709 }
710 else
711 {
712 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
713 "WGL: Driver does not support OpenGL ES version %i.%i",
714 ctxconfig->major,
715 ctxconfig->minor);
716 }
717 }
718 else if (error == (0xc0070000 | ERROR_INVALID_PROFILE_ARB))
719 {
720 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
721 "WGL: Driver does not support the requested OpenGL profile");
722 }
723 else if (error == (0xc0070000 | ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB))
724 {
725 _glfwInputError(GLFW_INVALID_VALUE,
726 "WGL: The share context is not compatible with the requested context");
727 }
728 else
729 {
730 if (ctxconfig->client == GLFW_OPENGL_API)
731 {
732 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
733 "WGL: Failed to create OpenGL context");
734 }
735 else
736 {
737 _glfwInputError(GLFW_VERSION_UNAVAILABLE,
738 "WGL: Failed to create OpenGL ES context");
739 }
740 }
741
742 return GLFW_FALSE;
743 }
744 }
745 else
746 {
747 window->context.wgl.handle = wglCreateContext(window->context.wgl.dc);
748 if (!window->context.wgl.handle)
749 {
750 _glfwInputErrorWin32(GLFW_VERSION_UNAVAILABLE,
751 "WGL: Failed to create OpenGL context");
752 return GLFW_FALSE;
753 }
754
755 if (share)
756 {
757 if (!wglShareLists(share, window->context.wgl.handle))
758 {
759 _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
760 "WGL: Failed to enable sharing with specified OpenGL context");
761 return GLFW_FALSE;
762 }
763 }
764 }
765
766 window->context.makeCurrent = makeContextCurrentWGL;
767 window->context.swapBuffers = swapBuffersWGL;
768 window->context.swapInterval = swapIntervalWGL;
769 window->context.extensionSupported = extensionSupportedWGL;
770 window->context.getProcAddress = getProcAddressWGL;
771 window->context.destroy = destroyContextWGL;
772
773 return GLFW_TRUE;
774}
775
776#undef setAttrib
777
778
779//////////////////////////////////////////////////////////////////////////
780////// GLFW native API //////
781//////////////////////////////////////////////////////////////////////////
782
783GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle)
784{
785 _GLFWwindow* window = (_GLFWwindow*) handle;
786 _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
787
788 if (window->context.client == GLFW_NO_API)
789 {
790 _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
791 return NULL;
792 }
793
794 return window->context.wgl.handle;
795}
796