context.c
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1 //========================================================================
2 // GLFW 3.3 - www.glfw.org
3 //------------------------------------------------------------------------
4 // Copyright (c) 2002-2006 Marcus Geelnard
5 // Copyright (c) 2006-2016 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 <assert.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <limits.h>
34 #include <stdio.h>
35 
36 
40 
41 // Checks whether the desired context attributes are valid
42 //
43 // This function checks things like whether the specified client API version
44 // exists and whether all relevant options have supported and non-conflicting
45 // values
46 //
48 {
49  if (ctxconfig->share)
50  {
51  if (ctxconfig->client == GLFW_NO_API ||
52  ctxconfig->share->context.client == GLFW_NO_API)
53  {
55  return GLFW_FALSE;
56  }
57  }
58 
59  if (ctxconfig->source != GLFW_NATIVE_CONTEXT_API &&
60  ctxconfig->source != GLFW_EGL_CONTEXT_API &&
61  ctxconfig->source != GLFW_OSMESA_CONTEXT_API)
62  {
64  "Invalid context creation API 0x%08X",
65  ctxconfig->source);
66  return GLFW_FALSE;
67  }
68 
69  if (ctxconfig->client != GLFW_NO_API &&
70  ctxconfig->client != GLFW_OPENGL_API &&
71  ctxconfig->client != GLFW_OPENGL_ES_API)
72  {
74  "Invalid client API 0x%08X",
75  ctxconfig->client);
76  return GLFW_FALSE;
77  }
78 
79  if (ctxconfig->client == GLFW_OPENGL_API)
80  {
81  if ((ctxconfig->major < 1 || ctxconfig->minor < 0) ||
82  (ctxconfig->major == 1 && ctxconfig->minor > 5) ||
83  (ctxconfig->major == 2 && ctxconfig->minor > 1) ||
84  (ctxconfig->major == 3 && ctxconfig->minor > 3))
85  {
86  // OpenGL 1.0 is the smallest valid version
87  // OpenGL 1.x series ended with version 1.5
88  // OpenGL 2.x series ended with version 2.1
89  // OpenGL 3.x series ended with version 3.3
90  // For now, let everything else through
91 
93  "Invalid OpenGL version %i.%i",
94  ctxconfig->major, ctxconfig->minor);
95  return GLFW_FALSE;
96  }
97 
98  if (ctxconfig->profile)
99  {
100  if (ctxconfig->profile != GLFW_OPENGL_CORE_PROFILE &&
101  ctxconfig->profile != GLFW_OPENGL_COMPAT_PROFILE)
102  {
104  "Invalid OpenGL profile 0x%08X",
105  ctxconfig->profile);
106  return GLFW_FALSE;
107  }
108 
109  if (ctxconfig->major <= 2 ||
110  (ctxconfig->major == 3 && ctxconfig->minor < 2))
111  {
112  // Desktop OpenGL context profiles are only defined for version 3.2
113  // and above
114 
116  "Context profiles are only defined for OpenGL version 3.2 and above");
117  return GLFW_FALSE;
118  }
119  }
120 
121  if (ctxconfig->forward && ctxconfig->major <= 2)
122  {
123  // Forward-compatible contexts are only defined for OpenGL version 3.0 and above
125  "Forward-compatibility is only defined for OpenGL version 3.0 and above");
126  return GLFW_FALSE;
127  }
128  }
129  else if (ctxconfig->client == GLFW_OPENGL_ES_API)
130  {
131  if (ctxconfig->major < 1 || ctxconfig->minor < 0 ||
132  (ctxconfig->major == 1 && ctxconfig->minor > 1) ||
133  (ctxconfig->major == 2 && ctxconfig->minor > 0))
134  {
135  // OpenGL ES 1.0 is the smallest valid version
136  // OpenGL ES 1.x series ended with version 1.1
137  // OpenGL ES 2.x series ended with version 2.0
138  // For now, let everything else through
139 
141  "Invalid OpenGL ES version %i.%i",
142  ctxconfig->major, ctxconfig->minor);
143  return GLFW_FALSE;
144  }
145  }
146 
147  if (ctxconfig->robustness)
148  {
149  if (ctxconfig->robustness != GLFW_NO_RESET_NOTIFICATION &&
151  {
153  "Invalid context robustness mode 0x%08X",
154  ctxconfig->robustness);
155  return GLFW_FALSE;
156  }
157  }
158 
159  if (ctxconfig->release)
160  {
161  if (ctxconfig->release != GLFW_RELEASE_BEHAVIOR_NONE &&
162  ctxconfig->release != GLFW_RELEASE_BEHAVIOR_FLUSH)
163  {
165  "Invalid context release behavior 0x%08X",
166  ctxconfig->release);
167  return GLFW_FALSE;
168  }
169  }
170 
171  return GLFW_TRUE;
172 }
173 
174 // Chooses the framebuffer config that best matches the desired one
175 //
177  const _GLFWfbconfig* alternatives,
178  unsigned int count)
179 {
180  unsigned int i;
181  unsigned int missing, leastMissing = UINT_MAX;
182  unsigned int colorDiff, leastColorDiff = UINT_MAX;
183  unsigned int extraDiff, leastExtraDiff = UINT_MAX;
184  const _GLFWfbconfig* current;
185  const _GLFWfbconfig* closest = NULL;
186 
187  for (i = 0; i < count; i++)
188  {
189  current = alternatives + i;
190 
191  if (desired->stereo > 0 && current->stereo == 0)
192  {
193  // Stereo is a hard constraint
194  continue;
195  }
196 
197  if (desired->doublebuffer != current->doublebuffer)
198  {
199  // Double buffering is a hard constraint
200  continue;
201  }
202 
203  // Count number of missing buffers
204  {
205  missing = 0;
206 
207  if (desired->alphaBits > 0 && current->alphaBits == 0)
208  missing++;
209 
210  if (desired->depthBits > 0 && current->depthBits == 0)
211  missing++;
212 
213  if (desired->stencilBits > 0 && current->stencilBits == 0)
214  missing++;
215 
216  if (desired->auxBuffers > 0 &&
217  current->auxBuffers < desired->auxBuffers)
218  {
219  missing += desired->auxBuffers - current->auxBuffers;
220  }
221 
222  if (desired->samples > 0 && current->samples == 0)
223  {
224  // Technically, several multisampling buffers could be
225  // involved, but that's a lower level implementation detail and
226  // not important to us here, so we count them as one
227  missing++;
228  }
229 
230  if (desired->transparent != current->transparent)
231  missing++;
232  }
233 
234  // These polynomials make many small channel size differences matter
235  // less than one large channel size difference
236 
237  // Calculate color channel size difference value
238  {
239  colorDiff = 0;
240 
241  if (desired->redBits != GLFW_DONT_CARE)
242  {
243  colorDiff += (desired->redBits - current->redBits) *
244  (desired->redBits - current->redBits);
245  }
246 
247  if (desired->greenBits != GLFW_DONT_CARE)
248  {
249  colorDiff += (desired->greenBits - current->greenBits) *
250  (desired->greenBits - current->greenBits);
251  }
252 
253  if (desired->blueBits != GLFW_DONT_CARE)
254  {
255  colorDiff += (desired->blueBits - current->blueBits) *
256  (desired->blueBits - current->blueBits);
257  }
258  }
259 
260  // Calculate non-color channel size difference value
261  {
262  extraDiff = 0;
263 
264  if (desired->alphaBits != GLFW_DONT_CARE)
265  {
266  extraDiff += (desired->alphaBits - current->alphaBits) *
267  (desired->alphaBits - current->alphaBits);
268  }
269 
270  if (desired->depthBits != GLFW_DONT_CARE)
271  {
272  extraDiff += (desired->depthBits - current->depthBits) *
273  (desired->depthBits - current->depthBits);
274  }
275 
276  if (desired->stencilBits != GLFW_DONT_CARE)
277  {
278  extraDiff += (desired->stencilBits - current->stencilBits) *
279  (desired->stencilBits - current->stencilBits);
280  }
281 
282  if (desired->accumRedBits != GLFW_DONT_CARE)
283  {
284  extraDiff += (desired->accumRedBits - current->accumRedBits) *
285  (desired->accumRedBits - current->accumRedBits);
286  }
287 
288  if (desired->accumGreenBits != GLFW_DONT_CARE)
289  {
290  extraDiff += (desired->accumGreenBits - current->accumGreenBits) *
291  (desired->accumGreenBits - current->accumGreenBits);
292  }
293 
294  if (desired->accumBlueBits != GLFW_DONT_CARE)
295  {
296  extraDiff += (desired->accumBlueBits - current->accumBlueBits) *
297  (desired->accumBlueBits - current->accumBlueBits);
298  }
299 
300  if (desired->accumAlphaBits != GLFW_DONT_CARE)
301  {
302  extraDiff += (desired->accumAlphaBits - current->accumAlphaBits) *
303  (desired->accumAlphaBits - current->accumAlphaBits);
304  }
305 
306  if (desired->samples != GLFW_DONT_CARE)
307  {
308  extraDiff += (desired->samples - current->samples) *
309  (desired->samples - current->samples);
310  }
311 
312  if (desired->sRGB && !current->sRGB)
313  extraDiff++;
314  }
315 
316  // Figure out if the current one is better than the best one found so far
317  // Least number of missing buffers is the most important heuristic,
318  // then color buffer size match and lastly size match for other buffers
319 
320  if (missing < leastMissing)
321  closest = current;
322  else if (missing == leastMissing)
323  {
324  if ((colorDiff < leastColorDiff) ||
325  (colorDiff == leastColorDiff && extraDiff < leastExtraDiff))
326  {
327  closest = current;
328  }
329  }
330 
331  if (current == closest)
332  {
333  leastMissing = missing;
334  leastColorDiff = colorDiff;
335  leastExtraDiff = extraDiff;
336  }
337  }
338 
339  return closest;
340 }
341 
342 // Retrieves the attributes of the current context
343 //
345  const _GLFWctxconfig* ctxconfig)
346 {
347  int i;
348  _GLFWwindow* previous;
349  const char* version;
350  const char* prefixes[] =
351  {
352  "OpenGL ES-CM ",
353  "OpenGL ES-CL ",
354  "OpenGL ES ",
355  NULL
356  };
357 
358  window->context.source = ctxconfig->source;
359  window->context.client = GLFW_OPENGL_API;
360 
361  previous = _glfwPlatformGetTls(&_glfw.contextSlot);;
363 
364  window->context.GetIntegerv = (PFNGLGETINTEGERVPROC)
365  window->context.getProcAddress("glGetIntegerv");
366  window->context.GetString = (PFNGLGETSTRINGPROC)
367  window->context.getProcAddress("glGetString");
368  if (!window->context.GetIntegerv || !window->context.GetString)
369  {
370  _glfwInputError(GLFW_PLATFORM_ERROR, "Entry point retrieval is broken");
371  glfwMakeContextCurrent((GLFWwindow*) previous);
372  return GLFW_FALSE;
373  }
374 
375  version = (const char*) window->context.GetString(GL_VERSION);
376  if (!version)
377  {
378  if (ctxconfig->client == GLFW_OPENGL_API)
379  {
381  "OpenGL version string retrieval is broken");
382  }
383  else
384  {
386  "OpenGL ES version string retrieval is broken");
387  }
388 
389  glfwMakeContextCurrent((GLFWwindow*) previous);
390  return GLFW_FALSE;
391  }
392 
393  for (i = 0; prefixes[i]; i++)
394  {
395  const size_t length = strlen(prefixes[i]);
396 
397  if (strncmp(version, prefixes[i], length) == 0)
398  {
399  version += length;
400  window->context.client = GLFW_OPENGL_ES_API;
401  break;
402  }
403  }
404 
405  if (!sscanf(version, "%d.%d.%d",
406  &window->context.major,
407  &window->context.minor,
408  &window->context.revision))
409  {
410  if (window->context.client == GLFW_OPENGL_API)
411  {
413  "No version found in OpenGL version string");
414  }
415  else
416  {
418  "No version found in OpenGL ES version string");
419  }
420 
421  glfwMakeContextCurrent((GLFWwindow*) previous);
422  return GLFW_FALSE;
423  }
424 
425  if (window->context.major < ctxconfig->major ||
426  (window->context.major == ctxconfig->major &&
427  window->context.minor < ctxconfig->minor))
428  {
429  // The desired OpenGL version is greater than the actual version
430  // This only happens if the machine lacks {GLX|WGL}_ARB_create_context
431  // /and/ the user has requested an OpenGL version greater than 1.0
432 
433  // For API consistency, we emulate the behavior of the
434  // {GLX|WGL}_ARB_create_context extension and fail here
435 
436  if (window->context.client == GLFW_OPENGL_API)
437  {
439  "Requested OpenGL version %i.%i, got version %i.%i",
440  ctxconfig->major, ctxconfig->minor,
441  window->context.major, window->context.minor);
442  }
443  else
444  {
446  "Requested OpenGL ES version %i.%i, got version %i.%i",
447  ctxconfig->major, ctxconfig->minor,
448  window->context.major, window->context.minor);
449  }
450 
451  glfwMakeContextCurrent((GLFWwindow*) previous);
452  return GLFW_FALSE;
453  }
454 
455  if (window->context.major >= 3)
456  {
457  // OpenGL 3.0+ uses a different function for extension string retrieval
458  // We cache it here instead of in glfwExtensionSupported mostly to alert
459  // users as early as possible that their build may be broken
460 
461  window->context.GetStringi = (PFNGLGETSTRINGIPROC)
462  window->context.getProcAddress("glGetStringi");
463  if (!window->context.GetStringi)
464  {
466  "Entry point retrieval is broken");
467  glfwMakeContextCurrent((GLFWwindow*) previous);
468  return GLFW_FALSE;
469  }
470  }
471 
472  if (window->context.client == GLFW_OPENGL_API)
473  {
474  // Read back context flags (OpenGL 3.0 and above)
475  if (window->context.major >= 3)
476  {
477  GLint flags;
478  window->context.GetIntegerv(GL_CONTEXT_FLAGS, &flags);
479 
481  window->context.forward = GLFW_TRUE;
482 
484  window->context.debug = GLFW_TRUE;
485  else if (glfwExtensionSupported("GL_ARB_debug_output") &&
486  ctxconfig->debug)
487  {
488  // HACK: This is a workaround for older drivers (pre KHR_debug)
489  // not setting the debug bit in the context flags for
490  // debug contexts
491  window->context.debug = GLFW_TRUE;
492  }
493 
495  window->context.noerror = GLFW_TRUE;
496  }
497 
498  // Read back OpenGL context profile (OpenGL 3.2 and above)
499  if (window->context.major >= 4 ||
500  (window->context.major == 3 && window->context.minor >= 2))
501  {
502  GLint mask;
503  window->context.GetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
504 
506  window->context.profile = GLFW_OPENGL_COMPAT_PROFILE;
508  window->context.profile = GLFW_OPENGL_CORE_PROFILE;
509  else if (glfwExtensionSupported("GL_ARB_compatibility"))
510  {
511  // HACK: This is a workaround for the compatibility profile bit
512  // not being set in the context flags if an OpenGL 3.2+
513  // context was created without having requested a specific
514  // version
515  window->context.profile = GLFW_OPENGL_COMPAT_PROFILE;
516  }
517  }
518 
519  // Read back robustness strategy
520  if (glfwExtensionSupported("GL_ARB_robustness"))
521  {
522  // NOTE: We avoid using the context flags for detection, as they are
523  // only present from 3.0 while the extension applies from 1.1
524 
525  GLint strategy;
526  window->context.GetIntegerv(GL_RESET_NOTIFICATION_STRATEGY_ARB,
527  &strategy);
528 
529  if (strategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
530  window->context.robustness = GLFW_LOSE_CONTEXT_ON_RESET;
531  else if (strategy == GL_NO_RESET_NOTIFICATION_ARB)
532  window->context.robustness = GLFW_NO_RESET_NOTIFICATION;
533  }
534  }
535  else
536  {
537  // Read back robustness strategy
538  if (glfwExtensionSupported("GL_EXT_robustness"))
539  {
540  // NOTE: The values of these constants match those of the OpenGL ARB
541  // one, so we can reuse them here
542 
543  GLint strategy;
544  window->context.GetIntegerv(GL_RESET_NOTIFICATION_STRATEGY_ARB,
545  &strategy);
546 
547  if (strategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
548  window->context.robustness = GLFW_LOSE_CONTEXT_ON_RESET;
549  else if (strategy == GL_NO_RESET_NOTIFICATION_ARB)
550  window->context.robustness = GLFW_NO_RESET_NOTIFICATION;
551  }
552  }
553 
554  if (glfwExtensionSupported("GL_KHR_context_flush_control"))
555  {
556  GLint behavior;
557  window->context.GetIntegerv(GL_CONTEXT_RELEASE_BEHAVIOR, &behavior);
558 
559  if (behavior == GL_NONE)
560  window->context.release = GLFW_RELEASE_BEHAVIOR_NONE;
561  else if (behavior == GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH)
562  window->context.release = GLFW_RELEASE_BEHAVIOR_FLUSH;
563  }
564 
565  // Clearing the front buffer to black to avoid garbage pixels left over from
566  // previous uses of our bit of VRAM
567  {
569  window->context.getProcAddress("glClear");
571  window->context.swapBuffers(window);
572  }
573 
574  glfwMakeContextCurrent((GLFWwindow*) previous);
575  return GLFW_TRUE;
576 }
577 
578 // Searches an extension string for the specified extension
579 //
580 GLFWbool _glfwStringInExtensionString(const char* string, const char* extensions)
581 {
582  const char* start = extensions;
583 
584  for (;;)
585  {
586  const char* where;
587  const char* terminator;
588 
589  where = strstr(start, string);
590  if (!where)
591  return GLFW_FALSE;
592 
593  terminator = where + strlen(string);
594  if (where == start || *(where - 1) == ' ')
595  {
596  if (*terminator == ' ' || *terminator == '\0')
597  break;
598  }
599 
600  start = terminator;
601  }
602 
603  return GLFW_TRUE;
604 }
605 
606 
610 
612 {
615 
617 
618  if (window && window->context.client == GLFW_NO_API)
619  {
621  "Cannot make current with a window that has no OpenGL or OpenGL ES context");
622  return;
623  }
624 
625  if (previous)
626  {
627  if (!window || window->context.source != previous->context.source)
628  previous->context.makeCurrent(NULL);
629  }
630 
631  if (window)
632  window->context.makeCurrent(window);
633 }
634 
636 {
639 }
640 
642 {
644  assert(window != NULL);
645 
647 
648  if (window->context.client == GLFW_NO_API)
649  {
651  "Cannot swap buffers of a window that has no OpenGL or OpenGL ES context");
652  return;
653  }
654 
655  window->context.swapBuffers(window);
656 }
657 
658 GLFWAPI void glfwSwapInterval(int interval)
659 {
661 
663 
665  if (!window)
666  {
668  "Cannot set swap interval without a current OpenGL or OpenGL ES context");
669  return;
670  }
671 
672  window->context.swapInterval(interval);
673 }
674 
675 GLFWAPI int glfwExtensionSupported(const char* extension)
676 {
678  assert(extension != NULL);
679 
681 
683  if (!window)
684  {
686  "Cannot query extension without a current OpenGL or OpenGL ES context");
687  return GLFW_FALSE;
688  }
689 
690  if (*extension == '\0')
691  {
692  _glfwInputError(GLFW_INVALID_VALUE, "Extension name cannot be an empty string");
693  return GLFW_FALSE;
694  }
695 
696  if (window->context.major >= 3)
697  {
698  int i;
699  GLint count;
700 
701  // Check if extension is in the modern OpenGL extensions string list
702 
703  window->context.GetIntegerv(GL_NUM_EXTENSIONS, &count);
704 
705  for (i = 0; i < count; i++)
706  {
707  const char* en = (const char*)
708  window->context.GetStringi(GL_EXTENSIONS, i);
709  if (!en)
710  {
712  "Extension string retrieval is broken");
713  return GLFW_FALSE;
714  }
715 
716  if (strcmp(en, extension) == 0)
717  return GLFW_TRUE;
718  }
719  }
720  else
721  {
722  // Check if extension is in the old style OpenGL extensions string
723 
724  const char* extensions = (const char*)
725  window->context.GetString(GL_EXTENSIONS);
726  if (!extensions)
727  {
729  "Extension string retrieval is broken");
730  return GLFW_FALSE;
731  }
732 
733  if (_glfwStringInExtensionString(extension, extensions))
734  return GLFW_TRUE;
735  }
736 
737  // Check if extension is in the platform-specific string
738  return window->context.extensionSupported(extension);
739 }
740 
741 GLFWAPI GLFWglproc glfwGetProcAddress(const char* procname)
742 {
744  assert(procname != NULL);
745 
747 
749  if (!window)
750  {
752  "Cannot query entry point without a current OpenGL or OpenGL ES context");
753  return NULL;
754  }
755 
756  return window->context.getProcAddress(procname);
757 }
758 
length
GLenum GLuint GLenum GLsizei length
Definition: glad/glad/glad.h:135
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GLFWAPI void glfwSwapInterval(int interval)
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Definition: context.c:658
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librealsense2
Author(s): LibRealSense ROS Team
autogenerated on Fri Aug 2 2024 08:30:01