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0022819: Redesign of OpenGl driver
[occt.git] / src / OpenGl / OpenGl_Window.cxx
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1// File: OpenGl_Window.cxx
2// Created: 20 September 2011
3// Author: Sergey ZERCHANINOV
4// Copyright: OPEN CASCADE 2011
5
6#include <InterfaceGraphic.hxx>
7
8#include <OpenGl_Window.hxx>
9
10#include <OpenGl_Context.hxx>
11#include <OpenGl_Display.hxx>
12#include <OpenGl_ResourceCleaner.hxx>
13#include <OpenGl_ResourceTexture.hxx>
14
15#include <Aspect_GraphicDeviceDefinitionError.hxx>
16#include <TCollection_AsciiString.hxx>
17
18IMPLEMENT_STANDARD_HANDLE(OpenGl_Window,MMgt_TShared)
19IMPLEMENT_STANDARD_RTTIEXT(OpenGl_Window,MMgt_TShared)
20
21namespace
22{
23 static const TEL_COLOUR THE_DEFAULT_BG_COLOR = { { 0.F, 0.F, 0.F, 1.F } };
24
25 static GLCONTEXT ThePreviousCtx = 0; // to share GL resources
26#if (!defined(_WIN32) && !defined(__WIN32__))
27 static GLXContext TheDeadGlxCtx; // Context to be destroyed
28 static Display* TheDeadGlxDpy; // Display associated with TheDeadGlxCtx
29#endif
30
31#if (defined(_WIN32) || defined(__WIN32__))
32 static int find_pixel_format (HDC hDC, PIXELFORMATDESCRIPTOR* pfd, const Standard_Boolean dbuff)
33 {
34 PIXELFORMATDESCRIPTOR pfd0;
35 memset (&pfd0, 0, sizeof (PIXELFORMATDESCRIPTOR));
36 pfd0.nSize = sizeof (PIXELFORMATDESCRIPTOR);
37 pfd0.nVersion = 1;
38 pfd0.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | (dbuff ? PFD_DOUBLEBUFFER : PFD_SUPPORT_GDI);
39 pfd0.iPixelType = PFD_TYPE_RGBA;
40 pfd0.iLayerType = PFD_MAIN_PLANE;
41
42 int iPixelFormat = 0;
43 int iGood = 0;
44 const int cBits[] = { 32, 24 };
45 const int dBits[] = { 32, 24, 16 };
46
47 int i, j;
48 for (i = 0; i < sizeof(dBits) / sizeof(int); i++)
49 {
50 pfd0.cDepthBits = dBits[i];
51 iGood = 0;
52 for (j = 0; j < sizeof(cBits) / sizeof(int); j++)
53 {
54 pfd0.cColorBits = cBits[j];
55 iPixelFormat = ChoosePixelFormat (hDC, &pfd0);
56 if (iPixelFormat)
57 {
58 pfd->cDepthBits = 0;
59 pfd->cColorBits = 0;
60 DescribePixelFormat (hDC, iPixelFormat, sizeof (PIXELFORMATDESCRIPTOR), pfd);
61 if (pfd->cColorBits >= cBits[j] && pfd->cDepthBits >= dBits[i])
62 break;
63 if (iGood == 0)
64 iGood = iPixelFormat;
65 }
66 }
67 if (j < sizeof(cBits) / sizeof(int))
68 break;
69 }
70
71 if (iPixelFormat == 0)
72 iPixelFormat = iGood;
73
74 return iPixelFormat;
75 }
76#else
77 static Bool WaitForNotify (Display* theDisp, XEvent* theEv, char* theArg)
78 {
79 return (theEv->type == MapNotify) && (theEv->xmap.window == (Window )theArg);
80 }
81#endif
82
83};
84
85// =======================================================================
86// function : OpenGl_Window
87// purpose :
88// =======================================================================
89OpenGl_Window::OpenGl_Window (const Handle(OpenGl_Display)& theDisplay,
90 const CALL_DEF_WINDOW& theCWindow,
91 Aspect_RenderingContext theGContext)
92: myDisplay (theDisplay),
93 myWindow (0),
94 myGContext ((GLCONTEXT )theGContext),
95 myGlContext (new OpenGl_Context()),
96 myOwnGContext (theGContext == 0),
97#if (defined(_WIN32) || defined(__WIN32__))
98 myWindowDC (0),
99 mySysPalInUse (FALSE),
100#endif
101 myWidth ((Standard_Integer )theCWindow.dx),
102 myHeight ((Standard_Integer )theCWindow.dy),
103 myBgColor (THE_DEFAULT_BG_COLOR),
104 myDither (theDisplay->Dither()),
105 myBackDither (theDisplay->BackDither())
106{
107 myBgColor.rgb[0] = theCWindow.Background.r;
108 myBgColor.rgb[1] = theCWindow.Background.g;
109 myBgColor.rgb[2] = theCWindow.Background.b;
110
111 WINDOW aParent = (WINDOW )theCWindow.XWindow;
112 DISPLAY* aDisp = (DISPLAY* )myDisplay->GetDisplay();
113
114#if (!defined(_WIN32) && !defined(__WIN32__))
115 XWindowAttributes wattr;
116 XGetWindowAttributes (aDisp, aParent, &wattr);
117 const int scr = DefaultScreen (aDisp);
118
119 XVisualInfo* aVis = NULL;
120 {
121 unsigned long aVisInfoMask = VisualIDMask | VisualScreenMask;
122 XVisualInfo aVisInfo;
123 aVisInfo.visualid = wattr.visual->visualid;
124 aVisInfo.screen = scr;
125 int aNbItems;
126 aVis = XGetVisualInfo (aDisp, aVisInfoMask, &aVisInfo, &aNbItems);
127 }
128
129 WINDOW win;
130
131 if (!myOwnGContext)
132 {
133 if (aVis != NULL)
134 {
135 Aspect_GraphicDeviceDefinitionError::Raise ("OpenGl_Window::CreateWindow: XGetVisualInfo failed.");
136 return;
137 }
138
139 win = aParent;
140 }
141 else
142 {
143 GLCONTEXT ctx;
144
145 #if defined(__linux) || defined(Linux)
146 if (aVis != NULL)
147 {
148 // check Visual for OpenGl context's parameters compability
149 int isGl = 0, isDoubleBuffer = 0, isRGBA = 0, aDepthSize = 0;
150
151 if (glXGetConfig (aDisp, aVis, GLX_USE_GL, &isGl) != 0)
152 isGl = 0;
153
154 if (glXGetConfig (aDisp, aVis, GLX_RGBA, &isRGBA) != 0)
155 isRGBA = 0;
156
157 if (glXGetConfig (aDisp, aVis, GLX_DOUBLEBUFFER, &isDoubleBuffer) != 0)
158 isDoubleBuffer = 0;
159
160 if (glXGetConfig (aDisp, aVis, GLX_DEPTH_SIZE, &aDepthSize) != 0)
161 aDepthSize = 0;
162
163 if (!isGl || !aDepthSize || !isRGBA || (isDoubleBuffer ? 1 : 0) != (myDisplay->DBuffer()? 1 : 0))
164 {
165 XFree (aVis);
166 aVis = NULL;
167 }
168 }
169 #endif
170
171 if (aVis == NULL)
172 {
173 int anIter = 0;
174 int anAttribs[11];
175 anAttribs[anIter++] = GLX_RGBA;
176
177 anAttribs[anIter++] = GLX_DEPTH_SIZE;
178 anAttribs[anIter++] = 1;
179
180 anAttribs[anIter++] = GLX_RED_SIZE;
181 anAttribs[anIter++] = (wattr.depth <= 8) ? 0 : 1;
182
183 anAttribs[anIter++] = GLX_GREEN_SIZE;
184 anAttribs[anIter++] = (wattr.depth <= 8) ? 0 : 1;
185
186 anAttribs[anIter++] = GLX_BLUE_SIZE;
187 anAttribs[anIter++] = (wattr.depth <= 8) ? 0 : 1;
188
189 if (myDisplay->DBuffer())
190 anAttribs[anIter++] = GLX_DOUBLEBUFFER;
191
192 anAttribs[anIter++] = None;
193
194 aVis = glXChooseVisual (aDisp, scr, anAttribs);
195 if (aVis == NULL)
196 {
197 Aspect_GraphicDeviceDefinitionError::Raise ("OpenGl_Window::CreateWindow: glXChooseVisual failed.");
198 return;
199 }
200 }
201
202 if (TheDeadGlxCtx)
203 {
204 // recover display lists from TheDeadGlxCtx, then destroy it
205 ctx = glXCreateContext (aDisp, aVis, TheDeadGlxCtx, GL_TRUE);
206
207 OpenGl_ResourceCleaner::GetInstance()->RemoveContext (TheDeadGlxCtx);
208 glXDestroyContext (TheDeadGlxDpy, TheDeadGlxCtx);
209
210 TheDeadGlxCtx = 0;
211 }
212 else if (ThePreviousCtx == 0)
213 {
214 ctx = glXCreateContext (aDisp, aVis, NULL, GL_TRUE);
215 }
216 else
217 {
218 // ctx est une copie du previous
219 ctx = glXCreateContext (aDisp, aVis, ThePreviousCtx, GL_TRUE);
220 }
221
222 if (!ctx)
223 {
224 Aspect_GraphicDeviceDefinitionError::Raise ("OpenGl_Window::CreateWindow: glXCreateContext failed.");
225 return;
226 }
227
228 OpenGl_ResourceCleaner::GetInstance()->AppendContext (ctx, true);
229
230 ThePreviousCtx = ctx;
231
232 Colormap cmap = XCreateColormap (aDisp, aParent, aVis->visual, AllocNone);
233
234 XColor color;
235 color.red = (unsigned short) (myBgColor.rgb[0] * 0xFFFF);
236 color.green = (unsigned short) (myBgColor.rgb[1] * 0xFFFF);
237 color.blue = (unsigned short) (myBgColor.rgb[2] * 0xFFFF);
238 color.flags = DoRed | DoGreen | DoBlue;
239 XAllocColor (aDisp, cmap, &color);
240
241 XSetWindowAttributes cwa;
242 cwa.colormap = cmap;
243 cwa.event_mask = StructureNotifyMask;
244 cwa.border_pixel = color.pixel;
245 cwa.background_pixel = color.pixel;
246
247 if (aVis->visualid == wattr.visual->visualid)
248 {
249 win = aParent;
250 }
251 else
252 {
253 unsigned long mask = CWBackPixel | CWColormap | CWBorderPixel | CWEventMask;
254 win = XCreateWindow (aDisp, aParent, 0, 0, myWidth, myHeight, 0/*bw*/, aVis->depth, InputOutput, aVis->visual, mask, &cwa);
255 }
256
257 XSetWindowBackground (aDisp, win, cwa.background_pixel);
258 XClearWindow (aDisp, win);
259
260 if (win != aParent)
261 {
262 XEvent anEvent;
263 XMapWindow (aDisp, win);
264 XIfEvent (aDisp, &anEvent, WaitForNotify, (char* )win);
265 }
266
267 myGContext = ctx;
268 }
269
270 /*
271 * Le BackDitherProp est utilise pour le clear du background
272 * Pour eviter une difference de couleurs avec la couleur choisie
273 * par l'application (XWindow) il faut desactiver le dithering
274 * au dessus de 8 plans.
275 *
276 * Pour le DitherProp:
277 * On cherchera a activer le Dithering que si le Visual a au moins
278 * 8 plans pour le GLX_RED_SIZE. Le test est plus sur car on peut
279 * avoir une profondeur superieure a 12 mais avoir besoin du dithering.
280 * (Carte Impact avec GLX_RED_SIZE a 5 par exemple)
281 */
282
283 int value;
284 glXGetConfig (aDisp, aVis, GLX_RED_SIZE, &value);
285
286 if (myDither)
287 myDither = (value < 8);
288
289 if (myBackDither)
290 myBackDither = (aVis->depth <= 8);
291
292 XFree ((char* )aVis);
293
294 myWindow = win;
295
296#else
297
298 myWindowDC = GetDC (aParent);
299
300 PIXELFORMATDESCRIPTOR pfd;
301 int iPixelFormat = find_pixel_format (myWindowDC, &pfd, myDisplay->DBuffer());
302 if (iPixelFormat == 0)
303 {
304 ReleaseDC (aParent, myWindowDC);
305 myWindowDC = 0;
306
307 TCollection_AsciiString msg ("OpenGl_Window::CreateWindow: ChoosePixelFormat failed. Error code: ");
308 msg += (int )GetLastError();
309 Aspect_GraphicDeviceDefinitionError::Raise (msg.ToCString());
310 return;
311 }
312
313 if (pfd.dwFlags & PFD_NEED_PALETTE)
314 {
315 WINDOW_DATA* wd = (WINDOW_DATA* )GetWindowLongPtr (aParent, GWLP_USERDATA);
316
317 mySysPalInUse = (pfd.dwFlags & PFD_NEED_SYSTEM_PALETTE) ? TRUE : FALSE;
318 InterfaceGraphic_RealizePalette (myWindowDC, wd->hPal, FALSE, mySysPalInUse);
319 }
320
321 if (myDither)
322 myDither = (pfd.cColorBits <= 8);
323
324 if (myBackDither)
325 myBackDither = (pfd.cColorBits <= 8);
326
327 if (!SetPixelFormat (myWindowDC, iPixelFormat, &pfd))
328 {
329 ReleaseDC (aParent, myWindowDC);
330 myWindowDC = NULL;
331
332 TCollection_AsciiString msg("OpenGl_Window::CreateWindow: SetPixelFormat failed. Error code: ");
333 msg += (int)GetLastError();
334 Aspect_GraphicDeviceDefinitionError::Raise (msg.ToCString());
335 return;
336 }
337
338 if (!myOwnGContext)
339 {
340 ThePreviousCtx = myGContext;
341 }
342 else
343 {
344 myGContext = wglCreateContext (myWindowDC);
345 if (myGContext == NULL)
346 {
347 ReleaseDC (aParent, myWindowDC);
348 myWindowDC = NULL;
349
350 TCollection_AsciiString msg ("OpenGl_Window::CreateWindow: wglCreateContext failed. Error code: ");
351 msg += (int )GetLastError();
352 Aspect_GraphicDeviceDefinitionError::Raise (msg.ToCString());
353 return;
354 }
355
356 Standard_Boolean isShared = Standard_True;
357 if (ThePreviousCtx == NULL)
358 {
359 ThePreviousCtx = myGContext;
360 }
361 else
362 {
363 // if we already have some shared context
364 GLCONTEXT shareCtx = OpenGl_ResourceCleaner::GetInstance()->GetSharedContext();
365 if (shareCtx != NULL)
366 {
367 // try to share context with one from resource cleaner list
368 isShared = (Standard_Boolean )wglShareLists (shareCtx, myGContext);
369 }
370 else
371 {
372 isShared = (Standard_Boolean )wglShareLists (ThePreviousCtx, myGContext);
373 // add shared ThePreviousCtx to a control list if it's not there
374 if (isShared)
375 OpenGl_ResourceCleaner::GetInstance()->AppendContext (ThePreviousCtx, isShared);
376 }
377 }
378
379 // add the context to OpenGl_ResourceCleaner control list
380 OpenGl_ResourceCleaner::GetInstance()->AppendContext (myGContext, isShared);
381 }
382
383 myWindow = aParent;
384#endif
385
386 Init();
387 myGlContext->Init();
388}
389
390// =======================================================================
391// function : ~OpenGl_Window
392// purpose :
393// =======================================================================
394OpenGl_Window::~OpenGl_Window()
395{
396 DISPLAY* aDisp = (DISPLAY* )myDisplay->GetDisplay();
397 if (aDisp == NULL || !myOwnGContext)
398 return;
399
400#if (defined(_WIN32) || defined(__WIN32__))
401 OpenGl_ResourceCleaner::GetInstance()->RemoveContext (myGContext);
402
403 if (wglGetCurrentContext() != NULL)
404 wglDeleteContext (myGContext);
405 ReleaseDC (myWindow, myWindowDC);
406
407 if (myDisplay->myMapOfWindows.Size() == 0)
408 ThePreviousCtx = 0;
409#else
410 // FSXXX sync necessary if non-direct rendering
411 glXWaitGL();
412
413 if (ThePreviousCtx == myGContext)
414 {
415 ThePreviousCtx = NULL;
416 if (myDisplay->myMapOfWindows.Size() > 0)
417 {
418 NCollection_DataMap<Standard_Integer, Handle(OpenGl_Window)>::Iterator it (myDisplay->myMapOfWindows);
419 ThePreviousCtx = it.Value()->myGContext;
420 }
421
422 // if this is the last remaining context, do not destroy it yet, to avoid
423 // losing any shared display lists (fonts...)
424 if (ThePreviousCtx)
425 {
426 OpenGl_ResourceCleaner::GetInstance()->RemoveContext(myGContext);
427 glXDestroyContext(aDisp, myGContext);
428 }
429 else
430 {
431 TheDeadGlxCtx = myGContext;
432 TheDeadGlxDpy = aDisp;
433 }
434 }
435 else
436 {
437 OpenGl_ResourceCleaner::GetInstance()->RemoveContext (myGContext);
438 glXDestroyContext (aDisp, myGContext);
439 }
440#endif
441}
442
443// =======================================================================
444// function : Activate
445// purpose :
446// =======================================================================
447Standard_Boolean OpenGl_Window::Activate()
448{
449 DISPLAY* aDisp = (DISPLAY* )myDisplay->GetDisplay();
450 if (aDisp == NULL)
451 return Standard_False;
452
453#if (defined(_WIN32) || defined(__WIN32__))
454 if (!wglMakeCurrent (myWindowDC, myGContext))
455 {
456 //GLenum errorcode = glGetError();
457 //const GLubyte *errorstring = gluErrorString(errorcode);
458 //printf("wglMakeCurrent failed: %d %s\n", errorcode, errorstring);
459 return Standard_False;
460 }
461#else
462 if (!glXMakeCurrent (aDisp, myWindow, myGContext))
463 {
464 // if there is no current context it might be impossible to use glGetError correctly
465 //printf("glXMakeCurrent failed!\n");
466 return Standard_False;
467 }
468#endif
469
470 return Standard_True;
471}
472
473// =======================================================================
474// function : Resize
475// purpose : call_subr_resize
476// =======================================================================
477void OpenGl_Window::Resize (const CALL_DEF_WINDOW& theCWindow)
478{
479 DISPLAY* aDisp = (DISPLAY* )myDisplay->GetDisplay();
480 if (aDisp == NULL)
481 return;
482
483 // If the size is not changed - do nothing
484 if ((myWidth == theCWindow.dx) && (myHeight == theCWindow.dy))
485 return;
486
487 myWidth = (Standard_Integer )theCWindow.dx;
488 myHeight = (Standard_Integer )theCWindow.dy;
489
490#if (!defined(_WIN32) && !defined(__WIN32__))
491 XResizeWindow (aDisp, myWindow, (unsigned int )myWidth, (unsigned int )myHeight);
492 XSync (aDisp, False);
493#endif
494
495 Init();
496}
497
498// =======================================================================
499// function : ReadDepths
500// purpose : TelReadDepths
501// =======================================================================
502void OpenGl_Window::ReadDepths (const Standard_Integer theX, const Standard_Integer theY,
503 const Standard_Integer theWidth, const Standard_Integer theHeight,
504 float* theDepths)
505{
506 if (theDepths == NULL || !Activate())
507 return;
508
509 glMatrixMode (GL_PROJECTION);
510 glLoadIdentity();
511 gluOrtho2D (0.0, (GLdouble )myWidth, 0.0, (GLdouble )myHeight);
512 glMatrixMode (GL_MODELVIEW);
513 glLoadIdentity();
514
515 glRasterPos2i (theX, theY);
516 DisableFeatures();
517 glReadPixels (theX, theY, theWidth, theHeight, GL_DEPTH_COMPONENT, GL_FLOAT, theDepths);
518 EnableFeatures();
519}
520
521// =======================================================================
522// function : SetBackgroundColor
523// purpose : call_subr_set_background
524// =======================================================================
525void OpenGl_Window::SetBackgroundColor (const Standard_ShortReal theR,
526 const Standard_ShortReal theG,
527 const Standard_ShortReal theB)
528{
529 myBgColor.rgb[0] = theR;
530 myBgColor.rgb[1] = theG;
531 myBgColor.rgb[2] = theB;
532}
533
534// =======================================================================
535// function : Init
536// purpose :
537// =======================================================================
538void OpenGl_Window::Init()
539{
540 if (!Activate())
541 return;
542
543#if (defined(_WIN32) || defined(__WIN32__))
544 RECT cr;
545 GetClientRect (myWindow, &cr);
546 myWidth = cr.right - cr.left;
547 myHeight = cr.bottom - cr.top;
548#else
549 Window aRootWin;
550 int aDummy;
551 unsigned int aDummyU;
552 unsigned int aNewWidth = 0;
553 unsigned int aNewHeight = 0;
554 DISPLAY* aDisp = (DISPLAY* )myDisplay->GetDisplay();
555 XGetGeometry (aDisp, myWindow, &aRootWin, &aDummy, &aDummy, &aNewWidth, &aNewHeight, &aDummyU, &aDummyU);
556 myWidth = aNewWidth;
557 myHeight = aNewHeight;
558#endif
559
560 glMatrixMode (GL_MODELVIEW);
561 glViewport (0, 0, myWidth, myHeight);
562
563 glDisable (GL_SCISSOR_TEST);
564 glDrawBuffer (GL_BACK);
565}
566
567// =======================================================================
568// function : EnablePolygonOffset
569// purpose : call_subr_enable_polygon_offset
570// =======================================================================
571void OpenGl_Window::EnablePolygonOffset() const
572{
573 Standard_ShortReal aFactor, aUnits;
574 myDisplay->PolygonOffset (aFactor, aUnits);
575 glPolygonOffset (aFactor, aUnits);
576 glEnable (GL_POLYGON_OFFSET_FILL);
577}
578
579// =======================================================================
580// function : DisablePolygonOffset
581// purpose : call_subr_disable_polygon_offset
582// =======================================================================
583void OpenGl_Window::DisablePolygonOffset() const
584{
585 glDisable (GL_POLYGON_OFFSET_FILL);
586}
587
588// =======================================================================
589// function : EnableFeatures
590// purpose :
591// =======================================================================
592void OpenGl_Window::EnableFeatures() const
593{
594 /*glPixelTransferi (GL_MAP_COLOR, GL_TRUE);*/
595
596 if (myDither)
597 glEnable (GL_DITHER);
598 else
599 glDisable (GL_DITHER);
600}
601
602// =======================================================================
603// function : DisableFeatures
604// purpose :
605// =======================================================================
606void OpenGl_Window::DisableFeatures() const
607{
608 glDisable (GL_DITHER);
609 glPixelTransferi (GL_MAP_COLOR, GL_FALSE);
610
611 /*
612 * Disable stuff that's likely to slow down glDrawPixels.
613 * (Omit as much of this as possible, when you know in advance
614 * that the OpenGL state will already be set correctly.)
615 */
616 glDisable(GL_ALPHA_TEST);
617 glDisable(GL_BLEND);
618 glDisable(GL_DEPTH_TEST);
619 glDisable(GL_FOG);
620 glDisable(GL_LIGHTING);
621
622 glDisable(GL_LOGIC_OP);
623 glDisable(GL_STENCIL_TEST);
624 glDisable(GL_TEXTURE_1D);
625 glDisable(GL_TEXTURE_2D);
626 glPixelTransferi(GL_MAP_COLOR, GL_FALSE);
627 glPixelTransferi(GL_RED_SCALE, 1);
628 glPixelTransferi(GL_RED_BIAS, 0);
629 glPixelTransferi(GL_GREEN_SCALE, 1);
630 glPixelTransferi(GL_GREEN_BIAS, 0);
631 glPixelTransferi(GL_BLUE_SCALE, 1);
632 glPixelTransferi(GL_BLUE_BIAS, 0);
633 glPixelTransferi(GL_ALPHA_SCALE, 1);
634 glPixelTransferi(GL_ALPHA_BIAS, 0);
635
636 /*
637 * Disable extensions that could slow down glDrawPixels.
638 * (Actually, you should check for the presence of the proper
639 * extension before making these calls. I've omitted that
640 * code for simplicity.)
641 */
642
643#ifdef GL_EXT_convolution
644 glDisable(GL_CONVOLUTION_1D_EXT);
645 glDisable(GL_CONVOLUTION_2D_EXT);
646 glDisable(GL_SEPARABLE_2D_EXT);
647#endif
648
649#ifdef GL_EXT_histogram
650 glDisable(GL_HISTOGRAM_EXT);
651 glDisable(GL_MINMAX_EXT);
652#endif
653
654#ifdef GL_EXT_texture3D
655 glDisable(GL_TEXTURE_3D_EXT);
656#endif
657}
658
659// =======================================================================
660// function : MakeFrontBufCurrent
661// purpose : TelMakeFrontBufCurrent
662// =======================================================================
663void OpenGl_Window::MakeFrontBufCurrent() const
664{
665 glDrawBuffer (GL_FRONT);
666}
667
668// =======================================================================
669// function : MakeBackBufCurrent
670// purpose : TelMakeBackBufCurrent
671// =======================================================================
672void OpenGl_Window::MakeBackBufCurrent() const
673{
674 glDrawBuffer (GL_BACK);
675}
676
677// =======================================================================
678// function : MakeFrontAndBackBufCurrent
679// purpose : TelMakeFrontAndBackBufCurrent
680// =======================================================================
681void OpenGl_Window::MakeFrontAndBackBufCurrent() const
682{
683 glDrawBuffer (GL_FRONT_AND_BACK);
684}
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