glx_api.c revision 1929d52fd907b4e42e31ad459dd50a1de53df26c 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.6
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27/**
28 * "Fake" GLX API implemented in terms of the XMesa*() functions.
29 */
30
31
32
33#define GLX_GLXEXT_PROTOTYPES
34#include "GL/glx.h"
35
36#include "xm_api.h"
37
38
39/* This indicates the client-side GLX API and GLX encoder version. */
40#define CLIENT_MAJOR_VERSION 1
41#define CLIENT_MINOR_VERSION 4  /* but don't have 1.3's pbuffers, etc yet */
42
43/* This indicates the server-side GLX decoder version.
44 * GLX 1.4 indicates OpenGL 1.3 support
45 */
46#define SERVER_MAJOR_VERSION 1
47#define SERVER_MINOR_VERSION 4
48
49/* Who implemented this GLX? */
50#define VENDOR "Brian Paul"
51
52#define EXTENSIONS \
53   "GLX_MESA_copy_sub_buffer " \
54   "GLX_MESA_pixmap_colormap " \
55   "GLX_MESA_release_buffers " \
56   "GLX_ARB_get_proc_address " \
57   "GLX_EXT_texture_from_pixmap " \
58   "GLX_EXT_visual_info " \
59   "GLX_EXT_visual_rating " \
60   /*"GLX_SGI_video_sync "*/ \
61   "GLX_SGIX_fbconfig " \
62   "GLX_SGIX_pbuffer "
63
64#define DEFAULT_DIRECT GL_TRUE
65
66
67
68/**
69 * The GLXContext typedef is defined as a pointer to this structure.
70 */
71struct __GLXcontextRec
72{
73   Display *currentDpy;
74   GLboolean isDirect;
75   GLXDrawable currentDrawable;
76   GLXDrawable currentReadable;
77   XID xid;
78
79   XMesaContext xmesaContext;
80};
81
82
83
84static pipe_tsd ContextTSD;
85
86/** Set current context for calling thread */
87static void
88SetCurrentContext(GLXContext c)
89{
90   pipe_tsd_set(&ContextTSD, c);
91}
92
93/** Get current context for calling thread */
94static GLXContext
95GetCurrentContext(void)
96{
97   return pipe_tsd_get(&ContextTSD);
98}
99
100
101
102/**********************************************************************/
103/***                       GLX Visual Code                          ***/
104/**********************************************************************/
105
106#define DONT_CARE -1
107
108
109static XMesaVisual *VisualTable = NULL;
110static int NumVisuals = 0;
111
112
113
114/* Macro to handle c_class vs class field name in XVisualInfo struct */
115#if defined(__cplusplus) || defined(c_plusplus)
116#define CLASS c_class
117#else
118#define CLASS class
119#endif
120
121
122
123/*
124 * Test if the given XVisualInfo is usable for Mesa rendering.
125 */
126static GLboolean
127is_usable_visual( XVisualInfo *vinfo )
128{
129   switch (vinfo->CLASS) {
130      case StaticGray:
131      case GrayScale:
132         /* Any StaticGray/GrayScale visual works in RGB or CI mode */
133         return GL_TRUE;
134      case StaticColor:
135      case PseudoColor:
136	 /* Any StaticColor/PseudoColor visual of at least 4 bits */
137	 if (vinfo->depth>=4) {
138	    return GL_TRUE;
139	 }
140	 else {
141	    return GL_FALSE;
142	 }
143      case TrueColor:
144      case DirectColor:
145	 /* Any depth of TrueColor or DirectColor works in RGB mode */
146	 return GL_TRUE;
147      default:
148	 /* This should never happen */
149	 return GL_FALSE;
150   }
151}
152
153
154/*
155 * Given an XVisualInfo and RGB, Double, and Depth buffer flags, save the
156 * configuration in our list of GLX visuals.
157 */
158static XMesaVisual
159save_glx_visual( Display *dpy, XVisualInfo *vinfo,
160                 GLboolean rgbFlag, GLboolean alphaFlag, GLboolean dbFlag,
161                 GLboolean stereoFlag,
162                 GLint depth_size, GLint stencil_size,
163                 GLint accumRedSize, GLint accumGreenSize,
164                 GLint accumBlueSize, GLint accumAlphaSize,
165                 GLint level, GLint numAuxBuffers )
166{
167   GLboolean ximageFlag = GL_TRUE;
168   XMesaVisual xmvis;
169   GLint i;
170   GLboolean comparePointers;
171
172   if (dbFlag) {
173      /* Check if the MESA_BACK_BUFFER env var is set */
174      char *backbuffer = _mesa_getenv("MESA_BACK_BUFFER");
175      if (backbuffer) {
176         if (backbuffer[0]=='p' || backbuffer[0]=='P') {
177            ximageFlag = GL_FALSE;
178         }
179         else if (backbuffer[0]=='x' || backbuffer[0]=='X') {
180            ximageFlag = GL_TRUE;
181         }
182         else {
183            _mesa_warning(NULL, "Mesa: invalid value for MESA_BACK_BUFFER environment variable, using an XImage.");
184         }
185      }
186   }
187
188   if (stereoFlag) {
189      /* stereo not supported */
190      return NULL;
191   }
192
193   if (stencil_size > 0 && depth_size > 0)
194      depth_size = 24;
195
196   /* Comparing IDs uses less memory but sometimes fails. */
197   /* XXX revisit this after 3.0 is finished. */
198   if (_mesa_getenv("MESA_GLX_VISUAL_HACK"))
199      comparePointers = GL_TRUE;
200   else
201      comparePointers = GL_FALSE;
202
203   /* Force the visual to have an alpha channel */
204   if (rgbFlag && _mesa_getenv("MESA_GLX_FORCE_ALPHA"))
205      alphaFlag = GL_TRUE;
206
207   /* First check if a matching visual is already in the list */
208   for (i=0; i<NumVisuals; i++) {
209      XMesaVisual v = VisualTable[i];
210      if (v->display == dpy
211          && v->mesa_visual.level == level
212          && v->mesa_visual.numAuxBuffers == numAuxBuffers
213          && v->ximage_flag == ximageFlag
214          && v->mesa_visual.rgbMode == rgbFlag
215          && v->mesa_visual.doubleBufferMode == dbFlag
216          && v->mesa_visual.stereoMode == stereoFlag
217          && (v->mesa_visual.alphaBits > 0) == alphaFlag
218          && (v->mesa_visual.depthBits >= depth_size || depth_size == 0)
219          && (v->mesa_visual.stencilBits >= stencil_size || stencil_size == 0)
220          && (v->mesa_visual.accumRedBits >= accumRedSize || accumRedSize == 0)
221          && (v->mesa_visual.accumGreenBits >= accumGreenSize || accumGreenSize == 0)
222          && (v->mesa_visual.accumBlueBits >= accumBlueSize || accumBlueSize == 0)
223          && (v->mesa_visual.accumAlphaBits >= accumAlphaSize || accumAlphaSize == 0)) {
224         /* now either compare XVisualInfo pointers or visual IDs */
225         if ((!comparePointers && v->visinfo->visualid == vinfo->visualid)
226             || (comparePointers && v->vishandle == vinfo)) {
227            return v;
228         }
229      }
230   }
231
232   /* Create a new visual and add it to the list. */
233
234   xmvis = XMesaCreateVisual( dpy, vinfo, rgbFlag, alphaFlag, dbFlag,
235                              stereoFlag, ximageFlag,
236                              depth_size, stencil_size,
237                              accumRedSize, accumBlueSize,
238                              accumBlueSize, accumAlphaSize, 0, level,
239                              GLX_NONE_EXT );
240   if (xmvis) {
241      /* Save a copy of the pointer now so we can find this visual again
242       * if we need to search for it in find_glx_visual().
243       */
244      xmvis->vishandle = vinfo;
245      /* Allocate more space for additional visual */
246      VisualTable = (XMesaVisual *) _mesa_realloc( VisualTable,
247                                   sizeof(XMesaVisual) * NumVisuals,
248                                   sizeof(XMesaVisual) * (NumVisuals + 1));
249      /* add xmvis to the list */
250      VisualTable[NumVisuals] = xmvis;
251      NumVisuals++;
252      /* XXX minor hack, because XMesaCreateVisual doesn't support an
253       * aux buffers parameter.
254       */
255      xmvis->mesa_visual.numAuxBuffers = numAuxBuffers;
256   }
257   return xmvis;
258}
259
260
261/**
262 * Return the default number of bits for the Z buffer.
263 * If defined, use the MESA_GLX_DEPTH_BITS env var value.
264 * Otherwise, use the DEFAULT_SOFTWARE_DEPTH_BITS constant.
265 * XXX probably do the same thing for stencil, accum, etc.
266 */
267static GLint
268default_depth_bits(void)
269{
270   int zBits;
271   const char *zEnv = _mesa_getenv("MESA_GLX_DEPTH_BITS");
272   if (zEnv)
273      zBits = atoi(zEnv);
274   else
275      zBits = DEFAULT_SOFTWARE_DEPTH_BITS;
276   return zBits;
277}
278
279static GLint
280default_alpha_bits(void)
281{
282   int aBits;
283   const char *aEnv = _mesa_getenv("MESA_GLX_ALPHA_BITS");
284   if (aEnv)
285      aBits = atoi(aEnv);
286   else
287      aBits = 0;
288   return aBits;
289}
290
291static GLint
292default_accum_bits(void)
293{
294   return 16;
295}
296
297
298
299/*
300 * Create a GLX visual from a regular XVisualInfo.
301 * This is called when Fake GLX is given an XVisualInfo which wasn't
302 * returned by glXChooseVisual.  Since this is the first time we're
303 * considering this visual we'll take a guess at reasonable values
304 * for depth buffer size, stencil size, accum size, etc.
305 * This is the best we can do with a client-side emulation of GLX.
306 */
307static XMesaVisual
308create_glx_visual( Display *dpy, XVisualInfo *visinfo )
309{
310   GLint zBits = default_depth_bits();
311   GLint accBits = default_accum_bits();
312   GLboolean alphaFlag = default_alpha_bits() > 0;
313
314   if (is_usable_visual( visinfo )) {
315      /* Configure this visual as RGB, double-buffered, depth-buffered. */
316      /* This is surely wrong for some people's needs but what else */
317      /* can be done?  They should use glXChooseVisual(). */
318      return save_glx_visual( dpy, visinfo,
319                              GL_TRUE,   /* rgb */
320                              alphaFlag, /* alpha */
321                              GL_TRUE,   /* double */
322                              GL_FALSE,  /* stereo */
323                              zBits,
324                              STENCIL_BITS,
325                              accBits, /* r */
326                              accBits, /* g */
327                              accBits, /* b */
328                              accBits, /* a */
329                              0,         /* level */
330                              0          /* numAux */
331         );
332   }
333   else {
334      _mesa_warning(NULL, "Mesa: error in glXCreateContext: bad visual\n");
335      return NULL;
336   }
337}
338
339
340
341/*
342 * Find the GLX visual associated with an XVisualInfo.
343 */
344static XMesaVisual
345find_glx_visual( Display *dpy, XVisualInfo *vinfo )
346{
347   int i;
348
349   /* try to match visual id */
350   for (i=0;i<NumVisuals;i++) {
351      if (VisualTable[i]->display==dpy
352          && VisualTable[i]->visinfo->visualid == vinfo->visualid) {
353         return VisualTable[i];
354      }
355   }
356
357   /* if that fails, try to match pointers */
358   for (i=0;i<NumVisuals;i++) {
359      if (VisualTable[i]->display==dpy && VisualTable[i]->vishandle==vinfo) {
360         return VisualTable[i];
361      }
362   }
363
364   return NULL;
365}
366
367
368/**
369 * Try to get an X visual which matches the given arguments.
370 */
371static XVisualInfo *
372get_visual( Display *dpy, int scr, unsigned int depth, int xclass )
373{
374   XVisualInfo temp, *vis;
375   long mask;
376   int n;
377   unsigned int default_depth;
378   int default_class;
379
380   mask = VisualScreenMask | VisualDepthMask | VisualClassMask;
381   temp.screen = scr;
382   temp.depth = depth;
383   temp.CLASS = xclass;
384
385   default_depth = DefaultDepth(dpy,scr);
386   default_class = DefaultVisual(dpy,scr)->CLASS;
387
388   if (depth==default_depth && xclass==default_class) {
389      /* try to get root window's visual */
390      temp.visualid = DefaultVisual(dpy,scr)->visualid;
391      mask |= VisualIDMask;
392   }
393
394   vis = XGetVisualInfo( dpy, mask, &temp, &n );
395
396   /* In case bits/pixel > 24, make sure color channels are still <=8 bits.
397    * An SGI Infinite Reality system, for example, can have 30bpp pixels:
398    * 10 bits per color channel.  Mesa's limited to a max of 8 bits/channel.
399    */
400   if (vis && depth > 24 && (xclass==TrueColor || xclass==DirectColor)) {
401      if (_mesa_bitcount((GLuint) vis->red_mask  ) <= 8 &&
402          _mesa_bitcount((GLuint) vis->green_mask) <= 8 &&
403          _mesa_bitcount((GLuint) vis->blue_mask ) <= 8) {
404         return vis;
405      }
406      else {
407         XFree((void *) vis);
408         return NULL;
409      }
410   }
411
412   return vis;
413}
414
415
416/*
417 * Retrieve the value of the given environment variable and find
418 * the X visual which matches it.
419 * Input:  dpy - the display
420 *         screen - the screen number
421 *         varname - the name of the environment variable
422 * Return:  an XVisualInfo pointer to NULL if error.
423 */
424static XVisualInfo *
425get_env_visual(Display *dpy, int scr, const char *varname)
426{
427   char value[100], type[100];
428   int depth, xclass = -1;
429   XVisualInfo *vis;
430
431   if (!_mesa_getenv( varname )) {
432      return NULL;
433   }
434
435   strncpy( value, _mesa_getenv(varname), 100 );
436   value[99] = 0;
437
438   sscanf( value, "%s %d", type, &depth );
439
440   if (strcmp(type,"TrueColor")==0)          xclass = TrueColor;
441   else if (strcmp(type,"DirectColor")==0)   xclass = DirectColor;
442   else if (strcmp(type,"PseudoColor")==0)   xclass = PseudoColor;
443   else if (strcmp(type,"StaticColor")==0)   xclass = StaticColor;
444   else if (strcmp(type,"GrayScale")==0)     xclass = GrayScale;
445   else if (strcmp(type,"StaticGray")==0)    xclass = StaticGray;
446
447   if (xclass>-1 && depth>0) {
448      vis = get_visual( dpy, scr, depth, xclass );
449      if (vis) {
450	 return vis;
451      }
452   }
453
454   _mesa_warning(NULL, "GLX unable to find visual class=%s, depth=%d.",
455                 type, depth);
456
457   return NULL;
458}
459
460
461
462/*
463 * Select an X visual which satisfies the RGBA flag and minimum depth.
464 * Input:  dpy,
465 *         screen - X display and screen number
466 *         min_depth - minimum visual depth
467 *         preferred_class - preferred GLX visual class or DONT_CARE
468 * Return:  pointer to an XVisualInfo or NULL.
469 */
470static XVisualInfo *
471choose_x_visual( Display *dpy, int screen, int min_depth,
472                 int preferred_class )
473{
474   XVisualInfo *vis;
475   int xclass, visclass = 0;
476   int depth;
477
478   /* First see if the MESA_RGB_VISUAL env var is defined */
479   vis = get_env_visual( dpy, screen, "MESA_RGB_VISUAL" );
480   if (vis) {
481      return vis;
482   }
483   /* Otherwise, search for a suitable visual */
484   if (preferred_class==DONT_CARE) {
485      for (xclass=0;xclass<6;xclass++) {
486         switch (xclass) {
487         case 0:  visclass = TrueColor;    break;
488         case 1:  visclass = DirectColor;  break;
489         case 2:  visclass = PseudoColor;  break;
490         case 3:  visclass = StaticColor;  break;
491         case 4:  visclass = GrayScale;    break;
492         case 5:  visclass = StaticGray;   break;
493         }
494         if (min_depth==0) {
495            /* start with shallowest */
496            for (depth=0;depth<=32;depth++) {
497               if (visclass==TrueColor && depth==8) {
498                  /* Special case:  try to get 8-bit PseudoColor before */
499                  /* 8-bit TrueColor */
500                  vis = get_visual( dpy, screen, 8, PseudoColor );
501                  if (vis) {
502                     return vis;
503                  }
504               }
505               vis = get_visual( dpy, screen, depth, visclass );
506               if (vis) {
507                  return vis;
508               }
509            }
510         }
511         else {
512            /* start with deepest */
513            for (depth=32;depth>=min_depth;depth--) {
514               if (visclass==TrueColor && depth==8) {
515                  /* Special case:  try to get 8-bit PseudoColor before */
516                  /* 8-bit TrueColor */
517                  vis = get_visual( dpy, screen, 8, PseudoColor );
518                  if (vis) {
519                     return vis;
520                  }
521               }
522               vis = get_visual( dpy, screen, depth, visclass );
523               if (vis) {
524                  return vis;
525               }
526            }
527         }
528      }
529   }
530   else {
531      /* search for a specific visual class */
532      switch (preferred_class) {
533      case GLX_TRUE_COLOR_EXT:    visclass = TrueColor;    break;
534      case GLX_DIRECT_COLOR_EXT:  visclass = DirectColor;  break;
535      case GLX_PSEUDO_COLOR_EXT:  visclass = PseudoColor;  break;
536      case GLX_STATIC_COLOR_EXT:  visclass = StaticColor;  break;
537      case GLX_GRAY_SCALE_EXT:    visclass = GrayScale;    break;
538      case GLX_STATIC_GRAY_EXT:   visclass = StaticGray;   break;
539      default:   return NULL;
540      }
541      if (min_depth==0) {
542         /* start with shallowest */
543         for (depth=0;depth<=32;depth++) {
544            vis = get_visual( dpy, screen, depth, visclass );
545            if (vis) {
546               return vis;
547            }
548         }
549      }
550      else {
551         /* start with deepest */
552         for (depth=32;depth>=min_depth;depth--) {
553            vis = get_visual( dpy, screen, depth, visclass );
554            if (vis) {
555               return vis;
556            }
557         }
558      }
559   }
560
561   /* didn't find a visual */
562   return NULL;
563}
564
565
566
567
568/**********************************************************************/
569/***             Display-related functions                          ***/
570/**********************************************************************/
571
572
573/**
574 * Free all XMesaVisuals which are associated with the given display.
575 */
576static void
577destroy_visuals_on_display(Display *dpy)
578{
579   int i;
580   for (i = 0; i < NumVisuals; i++) {
581      if (VisualTable[i]->display == dpy) {
582         /* remove this visual */
583         int j;
584         free(VisualTable[i]);
585         for (j = i; j < NumVisuals - 1; j++)
586            VisualTable[j] = VisualTable[j + 1];
587         NumVisuals--;
588      }
589   }
590}
591
592
593/**
594 * Called from XCloseDisplay() to let us free our display-related data.
595 */
596static int
597close_display_callback(Display *dpy, XExtCodes *codes)
598{
599   xmesa_destroy_buffers_on_display(dpy);
600   destroy_visuals_on_display(dpy);
601   return 0;
602}
603
604
605/**
606 * Look for the named extension on given display and return a pointer
607 * to the _XExtension data, or NULL if extension not found.
608 */
609static _XExtension *
610lookup_extension(Display *dpy, const char *extName)
611{
612   _XExtension *ext;
613   for (ext = dpy->ext_procs; ext; ext = ext->next) {
614      if (ext->name && strcmp(ext->name, extName) == 0) {
615         return ext;
616      }
617   }
618   return NULL;
619}
620
621
622/**
623 * Whenever we're given a new Display pointer, call this function to
624 * register our close_display_callback function.
625 */
626static void
627register_with_display(Display *dpy)
628{
629   const char *extName = "MesaGLX";
630   _XExtension *ext;
631
632   ext = lookup_extension(dpy, extName);
633   if (!ext) {
634      XExtCodes *c = XAddExtension(dpy);
635      ext = dpy->ext_procs;  /* new extension is at head of list */
636      assert(c->extension == ext->codes.extension);
637      (void) c;
638      ext->name = _mesa_strdup(extName);
639      ext->close_display = close_display_callback;
640   }
641}
642
643
644/**********************************************************************/
645/***                  Begin Fake GLX API Functions                  ***/
646/**********************************************************************/
647
648
649/**
650 * Helper used by glXChooseVisual and glXChooseFBConfig.
651 * The fbConfig parameter must be GL_FALSE for the former and GL_TRUE for
652 * the later.
653 * In either case, the attribute list is terminated with the value 'None'.
654 */
655static XMesaVisual
656choose_visual( Display *dpy, int screen, const int *list, GLboolean fbConfig )
657{
658   const GLboolean rgbModeDefault = fbConfig;
659   const int *parselist;
660   XVisualInfo *vis;
661   int min_ci = 0;
662   int min_red=0, min_green=0, min_blue=0;
663   GLboolean rgb_flag = rgbModeDefault;
664   GLboolean alpha_flag = GL_FALSE;
665   GLboolean double_flag = GL_FALSE;
666   GLboolean stereo_flag = GL_FALSE;
667   GLint depth_size = 0;
668   GLint stencil_size = 0;
669   GLint accumRedSize = 0;
670   GLint accumGreenSize = 0;
671   GLint accumBlueSize = 0;
672   GLint accumAlphaSize = 0;
673   int level = 0;
674   int visual_type = DONT_CARE;
675   int trans_type = DONT_CARE;
676   int trans_value = DONT_CARE;
677   GLint caveat = DONT_CARE;
678   XMesaVisual xmvis = NULL;
679   int desiredVisualID = -1;
680   int numAux = 0;
681
682   xmesa_init( dpy );
683
684   parselist = list;
685
686   while (*parselist) {
687
688      switch (*parselist) {
689	 case GLX_USE_GL:
690            if (fbConfig) {
691               /* invalid token */
692               return NULL;
693            }
694            else {
695               /* skip */
696               parselist++;
697            }
698	    break;
699	 case GLX_BUFFER_SIZE:
700	    parselist++;
701	    min_ci = *parselist++;
702	    break;
703	 case GLX_LEVEL:
704	    parselist++;
705            level = *parselist++;
706	    break;
707	 case GLX_RGBA:
708            if (fbConfig) {
709               /* invalid token */
710               return NULL;
711            }
712            else {
713               rgb_flag = GL_TRUE;
714               parselist++;
715            }
716	    break;
717	 case GLX_DOUBLEBUFFER:
718            parselist++;
719            if (fbConfig) {
720               double_flag = *parselist++;
721            }
722            else {
723               double_flag = GL_TRUE;
724            }
725	    break;
726	 case GLX_STEREO:
727            parselist++;
728            if (fbConfig) {
729               stereo_flag = *parselist++;
730            }
731            else {
732               stereo_flag = GL_TRUE;
733            }
734            break;
735	 case GLX_AUX_BUFFERS:
736	    parselist++;
737            numAux = *parselist++;
738            if (numAux > MAX_AUX_BUFFERS)
739               return NULL;
740	    break;
741	 case GLX_RED_SIZE:
742	    parselist++;
743	    min_red = *parselist++;
744	    break;
745	 case GLX_GREEN_SIZE:
746	    parselist++;
747	    min_green = *parselist++;
748	    break;
749	 case GLX_BLUE_SIZE:
750	    parselist++;
751	    min_blue = *parselist++;
752	    break;
753	 case GLX_ALPHA_SIZE:
754	    parselist++;
755            {
756               GLint size = *parselist++;
757               alpha_flag = size ? GL_TRUE : GL_FALSE;
758            }
759	    break;
760	 case GLX_DEPTH_SIZE:
761	    parselist++;
762	    depth_size = *parselist++;
763	    break;
764	 case GLX_STENCIL_SIZE:
765	    parselist++;
766	    stencil_size = *parselist++;
767	    break;
768	 case GLX_ACCUM_RED_SIZE:
769	    parselist++;
770            {
771               GLint size = *parselist++;
772               accumRedSize = MAX2( accumRedSize, size );
773            }
774            break;
775	 case GLX_ACCUM_GREEN_SIZE:
776	    parselist++;
777            {
778               GLint size = *parselist++;
779               accumGreenSize = MAX2( accumGreenSize, size );
780            }
781            break;
782	 case GLX_ACCUM_BLUE_SIZE:
783	    parselist++;
784            {
785               GLint size = *parselist++;
786               accumBlueSize = MAX2( accumBlueSize, size );
787            }
788            break;
789	 case GLX_ACCUM_ALPHA_SIZE:
790	    parselist++;
791            {
792               GLint size = *parselist++;
793               accumAlphaSize = MAX2( accumAlphaSize, size );
794            }
795	    break;
796
797         /*
798          * GLX_EXT_visual_info extension
799          */
800         case GLX_X_VISUAL_TYPE_EXT:
801            parselist++;
802            visual_type = *parselist++;
803            break;
804         case GLX_TRANSPARENT_TYPE_EXT:
805            parselist++;
806            trans_type = *parselist++;
807            break;
808         case GLX_TRANSPARENT_INDEX_VALUE_EXT:
809            parselist++;
810            trans_value = *parselist++;
811            break;
812         case GLX_TRANSPARENT_RED_VALUE_EXT:
813         case GLX_TRANSPARENT_GREEN_VALUE_EXT:
814         case GLX_TRANSPARENT_BLUE_VALUE_EXT:
815         case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
816	    /* ignore */
817	    parselist++;
818	    parselist++;
819	    break;
820
821         /*
822          * GLX_EXT_visual_info extension
823          */
824         case GLX_VISUAL_CAVEAT_EXT:
825            parselist++;
826            caveat = *parselist++; /* ignored for now */
827            break;
828
829         /*
830          * GLX_ARB_multisample
831          */
832         case GLX_SAMPLE_BUFFERS_ARB:
833            /* ms not supported */
834            return NULL;
835         case GLX_SAMPLES_ARB:
836            /* ms not supported */
837            return NULL;
838
839         /*
840          * FBConfig attribs.
841          */
842         case GLX_RENDER_TYPE:
843            if (!fbConfig)
844               return NULL;
845            parselist++;
846            if (*parselist & GLX_RGBA_BIT) {
847               rgb_flag = GL_TRUE;
848            }
849            else if (*parselist & GLX_COLOR_INDEX_BIT) {
850               rgb_flag = GL_FALSE;
851            }
852            else if (*parselist == 0) {
853               rgb_flag = GL_TRUE;
854            }
855            parselist++;
856            break;
857         case GLX_DRAWABLE_TYPE:
858            if (!fbConfig)
859               return NULL;
860            parselist++;
861            if (*parselist & ~(GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT)) {
862               return NULL; /* bad bit */
863            }
864            parselist++;
865            break;
866         case GLX_FBCONFIG_ID:
867            if (!fbConfig)
868               return NULL;
869            parselist++;
870            desiredVisualID = *parselist++;
871            break;
872         case GLX_X_RENDERABLE:
873            if (!fbConfig)
874               return NULL;
875            parselist += 2;
876            /* ignore */
877            break;
878
879#ifdef GLX_EXT_texture_from_pixmap
880         case GLX_BIND_TO_TEXTURE_RGB_EXT:
881            parselist++; /*skip*/
882            break;
883         case GLX_BIND_TO_TEXTURE_RGBA_EXT:
884            parselist++; /*skip*/
885            break;
886         case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
887            parselist++; /*skip*/
888            break;
889         case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
890            parselist++;
891            if (*parselist & ~(GLX_TEXTURE_1D_BIT_EXT |
892                               GLX_TEXTURE_2D_BIT_EXT |
893                               GLX_TEXTURE_RECTANGLE_BIT_EXT)) {
894               /* invalid bit */
895               return NULL;
896            }
897            break;
898         case GLX_Y_INVERTED_EXT:
899            parselist++; /*skip*/
900            break;
901#endif
902
903	 case None:
904            /* end of list */
905	    break;
906
907	 default:
908	    /* undefined attribute */
909            _mesa_warning(NULL, "unexpected attrib 0x%x in choose_visual()",
910                          *parselist);
911	    return NULL;
912      }
913   }
914
915   (void) caveat;
916
917
918   /*
919    * Since we're only simulating the GLX extension this function will never
920    * find any real GL visuals.  Instead, all we can do is try to find an RGB
921    * or CI visual of appropriate depth.  Other requested attributes such as
922    * double buffering, depth buffer, etc. will be associated with the X
923    * visual and stored in the VisualTable[].
924    */
925   if (desiredVisualID != -1) {
926      /* try to get a specific visual, by visualID */
927      XVisualInfo temp;
928      int n;
929      temp.visualid = desiredVisualID;
930      temp.screen = screen;
931      vis = XGetVisualInfo(dpy, VisualIDMask | VisualScreenMask, &temp, &n);
932      if (vis) {
933         /* give the visual some useful GLX attributes */
934         double_flag = GL_TRUE;
935         rgb_flag = GL_TRUE;
936      }
937   }
938   else if (level==0) {
939      /* normal color planes */
940      /* Get an RGB visual */
941      int min_rgb = min_red + min_green + min_blue;
942      if (min_rgb>1 && min_rgb<8) {
943         /* a special case to be sure we can get a monochrome visual */
944         min_rgb = 1;
945      }
946      vis = choose_x_visual( dpy, screen, min_rgb, visual_type );
947   }
948   else {
949      _mesa_warning(NULL, "overlay not supported");
950      return NULL;
951   }
952
953   if (vis) {
954      /* Note: we're not exactly obeying the glXChooseVisual rules here.
955       * When GLX_DEPTH_SIZE = 1 is specified we're supposed to choose the
956       * largest depth buffer size, which is 32bits/value.  Instead, we
957       * return 16 to maintain performance with earlier versions of Mesa.
958       */
959      if (stencil_size > 0)
960         depth_size = 24;  /* if Z and stencil, always use 24+8 format */
961      else if (depth_size > 24)
962         depth_size = 32;
963      else if (depth_size > 16)
964         depth_size = 24;
965      else if (depth_size > 0) {
966         depth_size = default_depth_bits();
967      }
968
969      if (!alpha_flag) {
970         alpha_flag = default_alpha_bits() > 0;
971      }
972
973      /* we only support one size of stencil and accum buffers. */
974      if (stencil_size > 0)
975         stencil_size = STENCIL_BITS;
976
977      if (accumRedSize > 0 ||
978          accumGreenSize > 0 ||
979          accumBlueSize > 0 ||
980          accumAlphaSize > 0) {
981
982         accumRedSize =
983            accumGreenSize =
984            accumBlueSize = default_accum_bits();
985
986         accumAlphaSize = alpha_flag ? accumRedSize : 0;
987      }
988
989      xmvis = save_glx_visual( dpy, vis, rgb_flag, alpha_flag, double_flag,
990                               stereo_flag, depth_size, stencil_size,
991                               accumRedSize, accumGreenSize,
992                               accumBlueSize, accumAlphaSize, level, numAux );
993   }
994
995   return xmvis;
996}
997
998
999PUBLIC XVisualInfo *
1000glXChooseVisual( Display *dpy, int screen, int *list )
1001{
1002   XMesaVisual xmvis;
1003
1004   /* register ourselves as an extension on this display */
1005   register_with_display(dpy);
1006
1007   xmvis = choose_visual(dpy, screen, list, GL_FALSE);
1008   if (xmvis) {
1009      /* create a new vishandle - the cached one may be stale */
1010      xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1011      if (xmvis->vishandle) {
1012         memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1013      }
1014      return xmvis->vishandle;
1015   }
1016   else
1017      return NULL;
1018}
1019
1020
1021/**
1022 * Helper function used by other glXCreateContext functions.
1023 */
1024static GLXContext
1025create_context(Display *dpy, XMesaVisual xmvis,
1026               XMesaContext shareCtx, Bool direct,
1027               unsigned major, unsigned minor,
1028               unsigned profileMask, unsigned contextFlags)
1029{
1030   GLXContext glxCtx;
1031
1032   if (!dpy || !xmvis)
1033      return 0;
1034
1035   glxCtx = CALLOC_STRUCT(__GLXcontextRec);
1036   if (!glxCtx)
1037      return 0;
1038
1039   /* deallocate unused windows/buffers */
1040#if 0
1041   XMesaGarbageCollect();
1042#endif
1043
1044   glxCtx->xmesaContext = XMesaCreateContext(xmvis, shareCtx, major, minor,
1045                                             profileMask, contextFlags);
1046   if (!glxCtx->xmesaContext) {
1047      free(glxCtx);
1048      return NULL;
1049   }
1050
1051   glxCtx->isDirect = DEFAULT_DIRECT;
1052   glxCtx->currentDpy = dpy;
1053   glxCtx->xid = (XID) glxCtx;  /* self pointer */
1054
1055   return glxCtx;
1056}
1057
1058
1059PUBLIC GLXContext
1060glXCreateContext( Display *dpy, XVisualInfo *visinfo,
1061                  GLXContext shareCtx, Bool direct )
1062{
1063   XMesaVisual xmvis;
1064
1065   xmvis = find_glx_visual( dpy, visinfo );
1066   if (!xmvis) {
1067      /* This visual wasn't found with glXChooseVisual() */
1068      xmvis = create_glx_visual( dpy, visinfo );
1069      if (!xmvis) {
1070         /* unusable visual */
1071         return NULL;
1072      }
1073   }
1074
1075   return create_context(dpy, xmvis,
1076                         shareCtx ? shareCtx->xmesaContext : NULL,
1077                         direct,
1078                         1, 0, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB, 0x0);
1079}
1080
1081
1082/* XXX these may have to be removed due to thread-safety issues. */
1083static GLXContext MakeCurrent_PrevContext = 0;
1084static GLXDrawable MakeCurrent_PrevDrawable = 0;
1085static GLXDrawable MakeCurrent_PrevReadable = 0;
1086static XMesaBuffer MakeCurrent_PrevDrawBuffer = 0;
1087static XMesaBuffer MakeCurrent_PrevReadBuffer = 0;
1088
1089
1090/* GLX 1.3 and later */
1091PUBLIC Bool
1092glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
1093                       GLXDrawable read, GLXContext ctx )
1094{
1095   GLXContext glxCtx = ctx;
1096   static boolean firsttime = 1, no_rast = 0;
1097
1098   if (firsttime) {
1099      no_rast = getenv("SP_NO_RAST") != NULL;
1100      firsttime = 0;
1101   }
1102
1103   if (ctx && draw && read) {
1104      XMesaBuffer drawBuffer, readBuffer;
1105      XMesaContext xmctx = glxCtx->xmesaContext;
1106
1107      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'draw' */
1108      if (ctx == MakeCurrent_PrevContext
1109          && draw == MakeCurrent_PrevDrawable) {
1110         drawBuffer = MakeCurrent_PrevDrawBuffer;
1111      }
1112      else {
1113         drawBuffer = XMesaFindBuffer( dpy, draw );
1114      }
1115      if (!drawBuffer) {
1116         /* drawable must be a new window! */
1117         drawBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, draw );
1118         if (!drawBuffer) {
1119            /* Out of memory, or context/drawable depth mismatch */
1120            return False;
1121         }
1122      }
1123
1124      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'read' */
1125      if (ctx == MakeCurrent_PrevContext
1126          && read == MakeCurrent_PrevReadable) {
1127         readBuffer = MakeCurrent_PrevReadBuffer;
1128      }
1129      else {
1130         readBuffer = XMesaFindBuffer( dpy, read );
1131      }
1132      if (!readBuffer) {
1133         /* drawable must be a new window! */
1134         readBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, read );
1135         if (!readBuffer) {
1136            /* Out of memory, or context/drawable depth mismatch */
1137            return False;
1138         }
1139      }
1140
1141      if (no_rast &&
1142          MakeCurrent_PrevContext == ctx &&
1143          MakeCurrent_PrevDrawable == draw &&
1144          MakeCurrent_PrevReadable == read &&
1145          MakeCurrent_PrevDrawBuffer == drawBuffer &&
1146          MakeCurrent_PrevReadBuffer == readBuffer)
1147         return True;
1148
1149      MakeCurrent_PrevContext = ctx;
1150      MakeCurrent_PrevDrawable = draw;
1151      MakeCurrent_PrevReadable = read;
1152      MakeCurrent_PrevDrawBuffer = drawBuffer;
1153      MakeCurrent_PrevReadBuffer = readBuffer;
1154
1155      /* Now make current! */
1156      if (XMesaMakeCurrent2(xmctx, drawBuffer, readBuffer)) {
1157         ctx->currentDpy = dpy;
1158         ctx->currentDrawable = draw;
1159         ctx->currentReadable = read;
1160         SetCurrentContext(ctx);
1161         return True;
1162      }
1163      else {
1164         return False;
1165      }
1166   }
1167   else if (!ctx && !draw && !read) {
1168      /* release current context w/out assigning new one. */
1169      XMesaMakeCurrent2( NULL, NULL, NULL );
1170      MakeCurrent_PrevContext = 0;
1171      MakeCurrent_PrevDrawable = 0;
1172      MakeCurrent_PrevReadable = 0;
1173      MakeCurrent_PrevDrawBuffer = 0;
1174      MakeCurrent_PrevReadBuffer = 0;
1175      SetCurrentContext(NULL);
1176      return True;
1177   }
1178   else {
1179      /* The args must either all be non-zero or all zero.
1180       * This is an error.
1181       */
1182      return False;
1183   }
1184}
1185
1186
1187PUBLIC Bool
1188glXMakeCurrent( Display *dpy, GLXDrawable drawable, GLXContext ctx )
1189{
1190   return glXMakeContextCurrent( dpy, drawable, drawable, ctx );
1191}
1192
1193
1194PUBLIC GLXContext
1195glXGetCurrentContext(void)
1196{
1197   return GetCurrentContext();
1198}
1199
1200
1201PUBLIC Display *
1202glXGetCurrentDisplay(void)
1203{
1204   GLXContext glxCtx = glXGetCurrentContext();
1205
1206   return glxCtx ? glxCtx->currentDpy : NULL;
1207}
1208
1209
1210PUBLIC Display *
1211glXGetCurrentDisplayEXT(void)
1212{
1213   return glXGetCurrentDisplay();
1214}
1215
1216
1217PUBLIC GLXDrawable
1218glXGetCurrentDrawable(void)
1219{
1220   GLXContext gc = glXGetCurrentContext();
1221   return gc ? gc->currentDrawable : 0;
1222}
1223
1224
1225PUBLIC GLXDrawable
1226glXGetCurrentReadDrawable(void)
1227{
1228   GLXContext gc = glXGetCurrentContext();
1229   return gc ? gc->currentReadable : 0;
1230}
1231
1232
1233PUBLIC GLXDrawable
1234glXGetCurrentReadDrawableSGI(void)
1235{
1236   return glXGetCurrentReadDrawable();
1237}
1238
1239
1240PUBLIC GLXPixmap
1241glXCreateGLXPixmap( Display *dpy, XVisualInfo *visinfo, Pixmap pixmap )
1242{
1243   XMesaVisual v;
1244   XMesaBuffer b;
1245
1246   v = find_glx_visual( dpy, visinfo );
1247   if (!v) {
1248      v = create_glx_visual( dpy, visinfo );
1249      if (!v) {
1250         /* unusable visual */
1251         return 0;
1252      }
1253   }
1254
1255   b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1256   if (!b) {
1257      return 0;
1258   }
1259   return b->drawable;
1260}
1261
1262
1263/*** GLX_MESA_pixmap_colormap ***/
1264
1265PUBLIC GLXPixmap
1266glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visinfo,
1267                        Pixmap pixmap, Colormap cmap )
1268{
1269   XMesaVisual v;
1270   XMesaBuffer b;
1271
1272   v = find_glx_visual( dpy, visinfo );
1273   if (!v) {
1274      v = create_glx_visual( dpy, visinfo );
1275      if (!v) {
1276         /* unusable visual */
1277         return 0;
1278      }
1279   }
1280
1281   b = XMesaCreatePixmapBuffer( v, pixmap, cmap );
1282   if (!b) {
1283      return 0;
1284   }
1285   return b->drawable;
1286}
1287
1288
1289PUBLIC void
1290glXDestroyGLXPixmap( Display *dpy, GLXPixmap pixmap )
1291{
1292   XMesaBuffer b = XMesaFindBuffer(dpy, pixmap);
1293   if (b) {
1294      XMesaDestroyBuffer(b);
1295   }
1296   else if (_mesa_getenv("MESA_DEBUG")) {
1297      _mesa_warning(NULL, "Mesa: glXDestroyGLXPixmap: invalid pixmap\n");
1298   }
1299}
1300
1301
1302PUBLIC void
1303glXCopyContext( Display *dpy, GLXContext src, GLXContext dst,
1304                unsigned long mask )
1305{
1306   XMesaContext xm_src = src->xmesaContext;
1307   XMesaContext xm_dst = dst->xmesaContext;
1308   (void) dpy;
1309   if (MakeCurrent_PrevContext == src) {
1310      glFlush();
1311   }
1312   XMesaCopyContext(xm_src, xm_dst, mask);
1313}
1314
1315
1316PUBLIC Bool
1317glXQueryExtension( Display *dpy, int *errorBase, int *eventBase )
1318{
1319   int op, ev, err;
1320   /* Mesa's GLX isn't really an X extension but we try to act like one. */
1321   if (!XQueryExtension(dpy, GLX_EXTENSION_NAME, &op, &ev, &err))
1322      ev = err = 0;
1323   if (errorBase)
1324      *errorBase = err;
1325   if (eventBase)
1326      *eventBase = ev;
1327   return True; /* we're faking GLX so always return success */
1328}
1329
1330
1331PUBLIC void
1332glXDestroyContext( Display *dpy, GLXContext ctx )
1333{
1334   GLXContext glxCtx = ctx;
1335   (void) dpy;
1336   MakeCurrent_PrevContext = 0;
1337   MakeCurrent_PrevDrawable = 0;
1338   MakeCurrent_PrevReadable = 0;
1339   MakeCurrent_PrevDrawBuffer = 0;
1340   MakeCurrent_PrevReadBuffer = 0;
1341   XMesaDestroyContext( glxCtx->xmesaContext );
1342   XMesaGarbageCollect();
1343   free(glxCtx);
1344}
1345
1346
1347PUBLIC Bool
1348glXIsDirect( Display *dpy, GLXContext ctx )
1349{
1350   GLXContext glxCtx = ctx;
1351   (void) ctx;
1352   return glxCtx->isDirect;
1353}
1354
1355
1356
1357PUBLIC void
1358glXSwapBuffers( Display *dpy, GLXDrawable drawable )
1359{
1360   XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1361   static boolean firsttime = 1, no_rast = 0;
1362
1363   if (firsttime) {
1364      no_rast = getenv("SP_NO_RAST") != NULL;
1365      firsttime = 0;
1366   }
1367
1368   if (no_rast)
1369      return;
1370
1371   if (buffer) {
1372      XMesaSwapBuffers(buffer);
1373   }
1374   else if (_mesa_getenv("MESA_DEBUG")) {
1375      _mesa_warning(NULL, "glXSwapBuffers: invalid drawable 0x%x\n",
1376                    (int) drawable);
1377   }
1378}
1379
1380
1381
1382/*** GLX_MESA_copy_sub_buffer ***/
1383
1384PUBLIC void
1385glXCopySubBufferMESA(Display *dpy, GLXDrawable drawable,
1386                     int x, int y, int width, int height)
1387{
1388   XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1389   if (buffer) {
1390      XMesaCopySubBuffer(buffer, x, y, width, height);
1391   }
1392   else if (_mesa_getenv("MESA_DEBUG")) {
1393      _mesa_warning(NULL, "Mesa: glXCopySubBufferMESA: invalid drawable\n");
1394   }
1395}
1396
1397
1398PUBLIC Bool
1399glXQueryVersion( Display *dpy, int *maj, int *min )
1400{
1401   (void) dpy;
1402   /* Return GLX version, not Mesa version */
1403   assert(CLIENT_MAJOR_VERSION == SERVER_MAJOR_VERSION);
1404   *maj = CLIENT_MAJOR_VERSION;
1405   *min = MIN2( CLIENT_MINOR_VERSION, SERVER_MINOR_VERSION );
1406   return True;
1407}
1408
1409
1410/*
1411 * Query the GLX attributes of the given XVisualInfo.
1412 */
1413static int
1414get_config( XMesaVisual xmvis, int attrib, int *value, GLboolean fbconfig )
1415{
1416   ASSERT(xmvis);
1417   switch(attrib) {
1418      case GLX_USE_GL:
1419         if (fbconfig)
1420            return GLX_BAD_ATTRIBUTE;
1421         *value = (int) True;
1422	 return 0;
1423      case GLX_BUFFER_SIZE:
1424	 *value = xmvis->visinfo->depth;
1425	 return 0;
1426      case GLX_LEVEL:
1427	 *value = xmvis->mesa_visual.level;
1428	 return 0;
1429      case GLX_RGBA:
1430         if (fbconfig)
1431            return GLX_BAD_ATTRIBUTE;
1432	 if (xmvis->mesa_visual.rgbMode) {
1433	    *value = True;
1434	 }
1435	 else {
1436	    *value = False;
1437	 }
1438	 return 0;
1439      case GLX_DOUBLEBUFFER:
1440	 *value = (int) xmvis->mesa_visual.doubleBufferMode;
1441	 return 0;
1442      case GLX_STEREO:
1443	 *value = (int) xmvis->mesa_visual.stereoMode;
1444	 return 0;
1445      case GLX_AUX_BUFFERS:
1446	 *value = xmvis->mesa_visual.numAuxBuffers;
1447	 return 0;
1448      case GLX_RED_SIZE:
1449         *value = xmvis->mesa_visual.redBits;
1450	 return 0;
1451      case GLX_GREEN_SIZE:
1452         *value = xmvis->mesa_visual.greenBits;
1453	 return 0;
1454      case GLX_BLUE_SIZE:
1455         *value = xmvis->mesa_visual.blueBits;
1456	 return 0;
1457      case GLX_ALPHA_SIZE:
1458         *value = xmvis->mesa_visual.alphaBits;
1459	 return 0;
1460      case GLX_DEPTH_SIZE:
1461         *value = xmvis->mesa_visual.depthBits;
1462	 return 0;
1463      case GLX_STENCIL_SIZE:
1464	 *value = xmvis->mesa_visual.stencilBits;
1465	 return 0;
1466      case GLX_ACCUM_RED_SIZE:
1467	 *value = xmvis->mesa_visual.accumRedBits;
1468	 return 0;
1469      case GLX_ACCUM_GREEN_SIZE:
1470	 *value = xmvis->mesa_visual.accumGreenBits;
1471	 return 0;
1472      case GLX_ACCUM_BLUE_SIZE:
1473	 *value = xmvis->mesa_visual.accumBlueBits;
1474	 return 0;
1475      case GLX_ACCUM_ALPHA_SIZE:
1476         *value = xmvis->mesa_visual.accumAlphaBits;
1477	 return 0;
1478
1479      /*
1480       * GLX_EXT_visual_info extension
1481       */
1482      case GLX_X_VISUAL_TYPE_EXT:
1483         switch (xmvis->visinfo->CLASS) {
1484            case StaticGray:   *value = GLX_STATIC_GRAY_EXT;   return 0;
1485            case GrayScale:    *value = GLX_GRAY_SCALE_EXT;    return 0;
1486            case StaticColor:  *value = GLX_STATIC_GRAY_EXT;   return 0;
1487            case PseudoColor:  *value = GLX_PSEUDO_COLOR_EXT;  return 0;
1488            case TrueColor:    *value = GLX_TRUE_COLOR_EXT;    return 0;
1489            case DirectColor:  *value = GLX_DIRECT_COLOR_EXT;  return 0;
1490         }
1491         return 0;
1492      case GLX_TRANSPARENT_TYPE_EXT:
1493         /* normal planes */
1494         *value = GLX_NONE_EXT;
1495         return 0;
1496      case GLX_TRANSPARENT_INDEX_VALUE_EXT:
1497         /* undefined */
1498         return 0;
1499      case GLX_TRANSPARENT_RED_VALUE_EXT:
1500         /* undefined */
1501         return 0;
1502      case GLX_TRANSPARENT_GREEN_VALUE_EXT:
1503         /* undefined */
1504         return 0;
1505      case GLX_TRANSPARENT_BLUE_VALUE_EXT:
1506         /* undefined */
1507         return 0;
1508      case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
1509         /* undefined */
1510         return 0;
1511
1512      /*
1513       * GLX_EXT_visual_info extension
1514       */
1515      case GLX_VISUAL_CAVEAT_EXT:
1516         /* test for zero, just in case */
1517         if (xmvis->mesa_visual.visualRating > 0)
1518            *value = xmvis->mesa_visual.visualRating;
1519         else
1520            *value = GLX_NONE_EXT;
1521         return 0;
1522
1523      /*
1524       * GLX_ARB_multisample
1525       */
1526      case GLX_SAMPLE_BUFFERS_ARB:
1527         *value = 0;
1528         return 0;
1529      case GLX_SAMPLES_ARB:
1530         *value = 0;
1531         return 0;
1532
1533      /*
1534       * For FBConfigs:
1535       */
1536      case GLX_SCREEN_EXT:
1537         if (!fbconfig)
1538            return GLX_BAD_ATTRIBUTE;
1539         *value = xmvis->visinfo->screen;
1540         break;
1541      case GLX_DRAWABLE_TYPE: /*SGIX too */
1542         if (!fbconfig)
1543            return GLX_BAD_ATTRIBUTE;
1544         *value = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
1545         break;
1546      case GLX_RENDER_TYPE_SGIX:
1547         if (!fbconfig)
1548            return GLX_BAD_ATTRIBUTE;
1549         if (xmvis->mesa_visual.rgbMode)
1550            *value = GLX_RGBA_BIT;
1551         else
1552            *value = GLX_COLOR_INDEX_BIT;
1553         break;
1554      case GLX_X_RENDERABLE_SGIX:
1555         if (!fbconfig)
1556            return GLX_BAD_ATTRIBUTE;
1557         *value = True; /* XXX really? */
1558         break;
1559      case GLX_FBCONFIG_ID_SGIX:
1560         if (!fbconfig)
1561            return GLX_BAD_ATTRIBUTE;
1562         *value = xmvis->visinfo->visualid;
1563         break;
1564      case GLX_MAX_PBUFFER_WIDTH:
1565         if (!fbconfig)
1566            return GLX_BAD_ATTRIBUTE;
1567         /* XXX or MAX_WIDTH? */
1568         *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen);
1569         break;
1570      case GLX_MAX_PBUFFER_HEIGHT:
1571         if (!fbconfig)
1572            return GLX_BAD_ATTRIBUTE;
1573         *value = DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1574         break;
1575      case GLX_MAX_PBUFFER_PIXELS:
1576         if (!fbconfig)
1577            return GLX_BAD_ATTRIBUTE;
1578         *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen) *
1579                  DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1580         break;
1581      case GLX_VISUAL_ID:
1582         if (!fbconfig)
1583            return GLX_BAD_ATTRIBUTE;
1584         *value = xmvis->visinfo->visualid;
1585         break;
1586
1587#ifdef GLX_EXT_texture_from_pixmap
1588      case GLX_BIND_TO_TEXTURE_RGB_EXT:
1589         *value = True; /*XXX*/
1590         break;
1591      case GLX_BIND_TO_TEXTURE_RGBA_EXT:
1592         /* XXX review */
1593         *value = xmvis->mesa_visual.alphaBits > 0 ? True : False;
1594         break;
1595      case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
1596         *value = True; /*XXX*/
1597         break;
1598      case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
1599         *value = (GLX_TEXTURE_1D_BIT_EXT |
1600                   GLX_TEXTURE_2D_BIT_EXT |
1601                   GLX_TEXTURE_RECTANGLE_BIT_EXT); /*XXX*/
1602         break;
1603      case GLX_Y_INVERTED_EXT:
1604         *value = True; /*XXX*/
1605         break;
1606#endif
1607
1608      default:
1609	 return GLX_BAD_ATTRIBUTE;
1610   }
1611   return Success;
1612}
1613
1614
1615PUBLIC int
1616glXGetConfig( Display *dpy, XVisualInfo *visinfo,
1617                   int attrib, int *value )
1618{
1619   XMesaVisual xmvis;
1620   int k;
1621   if (!dpy || !visinfo)
1622      return GLX_BAD_ATTRIBUTE;
1623
1624   xmvis = find_glx_visual( dpy, visinfo );
1625   if (!xmvis) {
1626      /* this visual wasn't obtained with glXChooseVisual */
1627      xmvis = create_glx_visual( dpy, visinfo );
1628      if (!xmvis) {
1629	 /* this visual can't be used for GL rendering */
1630	 if (attrib==GLX_USE_GL) {
1631	    *value = (int) False;
1632	    return 0;
1633	 }
1634	 else {
1635	    return GLX_BAD_VISUAL;
1636	 }
1637      }
1638   }
1639
1640   k = get_config(xmvis, attrib, value, GL_FALSE);
1641   return k;
1642}
1643
1644
1645PUBLIC void
1646glXWaitGL( void )
1647{
1648   XMesaContext xmesa = XMesaGetCurrentContext();
1649   XMesaFlush( xmesa );
1650}
1651
1652
1653
1654PUBLIC void
1655glXWaitX( void )
1656{
1657   XMesaContext xmesa = XMesaGetCurrentContext();
1658   XMesaFlush( xmesa );
1659}
1660
1661
1662static const char *
1663get_extensions( void )
1664{
1665   return EXTENSIONS;
1666}
1667
1668
1669
1670/* GLX 1.1 and later */
1671PUBLIC const char *
1672glXQueryExtensionsString( Display *dpy, int screen )
1673{
1674   (void) dpy;
1675   (void) screen;
1676   return get_extensions();
1677}
1678
1679
1680
1681/* GLX 1.1 and later */
1682PUBLIC const char *
1683glXQueryServerString( Display *dpy, int screen, int name )
1684{
1685   static char version[1000];
1686   sprintf(version, "%d.%d %s",
1687	   SERVER_MAJOR_VERSION, SERVER_MINOR_VERSION, xmesa_get_name());
1688
1689   (void) dpy;
1690   (void) screen;
1691
1692   switch (name) {
1693      case GLX_EXTENSIONS:
1694         return get_extensions();
1695      case GLX_VENDOR:
1696	 return VENDOR;
1697      case GLX_VERSION:
1698	 return version;
1699      default:
1700         return NULL;
1701   }
1702}
1703
1704
1705
1706/* GLX 1.1 and later */
1707PUBLIC const char *
1708glXGetClientString( Display *dpy, int name )
1709{
1710   static char version[1000];
1711   sprintf(version, "%d.%d %s", CLIENT_MAJOR_VERSION,
1712	   CLIENT_MINOR_VERSION, xmesa_get_name());
1713
1714   (void) dpy;
1715
1716   switch (name) {
1717      case GLX_EXTENSIONS:
1718         return get_extensions();
1719      case GLX_VENDOR:
1720	 return VENDOR;
1721      case GLX_VERSION:
1722	 return version;
1723      default:
1724         return NULL;
1725   }
1726}
1727
1728
1729
1730/*
1731 * GLX 1.3 and later
1732 */
1733
1734
1735PUBLIC int
1736glXGetFBConfigAttrib(Display *dpy, GLXFBConfig config,
1737                     int attribute, int *value)
1738{
1739   XMesaVisual v = (XMesaVisual) config;
1740   (void) dpy;
1741   (void) config;
1742
1743   if (!dpy || !config || !value)
1744      return -1;
1745
1746   return get_config(v, attribute, value, GL_TRUE);
1747}
1748
1749
1750PUBLIC GLXFBConfig *
1751glXGetFBConfigs( Display *dpy, int screen, int *nelements )
1752{
1753   XVisualInfo *visuals, visTemplate;
1754   const long visMask = VisualScreenMask;
1755   int i;
1756
1757   /* Get list of all X visuals */
1758   visTemplate.screen = screen;
1759   visuals = XGetVisualInfo(dpy, visMask, &visTemplate, nelements);
1760   if (*nelements > 0) {
1761      XMesaVisual *results;
1762      results = (XMesaVisual *) malloc(*nelements * sizeof(XMesaVisual));
1763      if (!results) {
1764         *nelements = 0;
1765         return NULL;
1766      }
1767      for (i = 0; i < *nelements; i++) {
1768         results[i] = create_glx_visual(dpy, visuals + i);
1769         if (!results[i]) {
1770            *nelements = i;
1771            break;
1772         }
1773      }
1774      return (GLXFBConfig *) results;
1775   }
1776   return NULL;
1777}
1778
1779
1780PUBLIC GLXFBConfig *
1781glXChooseFBConfig(Display *dpy, int screen,
1782                  const int *attribList, int *nitems)
1783{
1784   XMesaVisual xmvis;
1785
1786   if (!attribList || !attribList[0]) {
1787      /* return list of all configs (per GLX_SGIX_fbconfig spec) */
1788      return glXGetFBConfigs(dpy, screen, nitems);
1789   }
1790
1791   xmvis = choose_visual(dpy, screen, attribList, GL_TRUE);
1792   if (xmvis) {
1793      GLXFBConfig *config = (GLXFBConfig *) malloc(sizeof(XMesaVisual));
1794      if (!config) {
1795         *nitems = 0;
1796         return NULL;
1797      }
1798      *nitems = 1;
1799      config[0] = (GLXFBConfig) xmvis;
1800      return (GLXFBConfig *) config;
1801   }
1802   else {
1803      *nitems = 0;
1804      return NULL;
1805   }
1806}
1807
1808
1809PUBLIC XVisualInfo *
1810glXGetVisualFromFBConfig( Display *dpy, GLXFBConfig config )
1811{
1812   if (dpy && config) {
1813      XMesaVisual xmvis = (XMesaVisual) config;
1814#if 0
1815      return xmvis->vishandle;
1816#else
1817      /* create a new vishandle - the cached one may be stale */
1818      xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1819      if (xmvis->vishandle) {
1820         memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1821      }
1822      return xmvis->vishandle;
1823#endif
1824   }
1825   else {
1826      return NULL;
1827   }
1828}
1829
1830
1831PUBLIC GLXWindow
1832glXCreateWindow(Display *dpy, GLXFBConfig config, Window win,
1833                const int *attribList)
1834{
1835   XMesaVisual xmvis = (XMesaVisual) config;
1836   XMesaBuffer xmbuf;
1837   if (!xmvis)
1838      return 0;
1839
1840   xmbuf = XMesaCreateWindowBuffer(xmvis, win);
1841   if (!xmbuf)
1842      return 0;
1843
1844   (void) dpy;
1845   (void) attribList;  /* Ignored in GLX 1.3 */
1846
1847   return win;  /* A hack for now */
1848}
1849
1850
1851PUBLIC void
1852glXDestroyWindow( Display *dpy, GLXWindow window )
1853{
1854   XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable) window);
1855   if (b)
1856      XMesaDestroyBuffer(b);
1857   /* don't destroy X window */
1858}
1859
1860
1861/* XXX untested */
1862PUBLIC GLXPixmap
1863glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap,
1864                const int *attribList)
1865{
1866   XMesaVisual v = (XMesaVisual) config;
1867   XMesaBuffer b;
1868   const int *attr;
1869   int target = 0, format = 0, mipmap = 0;
1870   int value;
1871
1872   if (!dpy || !config || !pixmap)
1873      return 0;
1874
1875   for (attr = attribList; attr && *attr; attr++) {
1876      switch (*attr) {
1877      case GLX_TEXTURE_FORMAT_EXT:
1878         attr++;
1879         switch (*attr) {
1880         case GLX_TEXTURE_FORMAT_NONE_EXT:
1881         case GLX_TEXTURE_FORMAT_RGB_EXT:
1882         case GLX_TEXTURE_FORMAT_RGBA_EXT:
1883            format = *attr;
1884            break;
1885         default:
1886            /* error */
1887            return 0;
1888         }
1889         break;
1890      case GLX_TEXTURE_TARGET_EXT:
1891         attr++;
1892         switch (*attr) {
1893         case GLX_TEXTURE_1D_EXT:
1894         case GLX_TEXTURE_2D_EXT:
1895         case GLX_TEXTURE_RECTANGLE_EXT:
1896            target = *attr;
1897            break;
1898         default:
1899            /* error */
1900            return 0;
1901         }
1902         break;
1903      case GLX_MIPMAP_TEXTURE_EXT:
1904         attr++;
1905         if (*attr)
1906            mipmap = 1;
1907         break;
1908      default:
1909         /* error */
1910         return 0;
1911      }
1912   }
1913
1914   if (format == GLX_TEXTURE_FORMAT_RGB_EXT) {
1915      if (get_config(v, GLX_BIND_TO_TEXTURE_RGB_EXT,
1916                     &value, GL_TRUE) != Success
1917          || !value) {
1918         return 0; /* error! */
1919      }
1920   }
1921   else if (format == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1922      if (get_config(v, GLX_BIND_TO_TEXTURE_RGBA_EXT,
1923                     &value, GL_TRUE) != Success
1924          || !value) {
1925         return 0; /* error! */
1926      }
1927   }
1928   if (mipmap) {
1929      if (get_config(v, GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
1930                     &value, GL_TRUE) != Success
1931          || !value) {
1932         return 0; /* error! */
1933      }
1934   }
1935   if (target == GLX_TEXTURE_1D_EXT) {
1936      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1937                     &value, GL_TRUE) != Success
1938          || (value & GLX_TEXTURE_1D_BIT_EXT) == 0) {
1939         return 0; /* error! */
1940      }
1941   }
1942   else if (target == GLX_TEXTURE_2D_EXT) {
1943      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1944                     &value, GL_TRUE) != Success
1945          || (value & GLX_TEXTURE_2D_BIT_EXT) == 0) {
1946         return 0; /* error! */
1947      }
1948   }
1949   if (target == GLX_TEXTURE_RECTANGLE_EXT) {
1950      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1951                     &value, GL_TRUE) != Success
1952          || (value & GLX_TEXTURE_RECTANGLE_BIT_EXT) == 0) {
1953         return 0; /* error! */
1954      }
1955   }
1956
1957   if (format || target || mipmap) {
1958      /* texture from pixmap */
1959      b = XMesaCreatePixmapTextureBuffer(v, pixmap, 0, format, target, mipmap);
1960   }
1961   else {
1962      b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1963   }
1964   if (!b) {
1965      return 0;
1966   }
1967
1968   return pixmap;
1969}
1970
1971
1972PUBLIC void
1973glXDestroyPixmap( Display *dpy, GLXPixmap pixmap )
1974{
1975   XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable)pixmap);
1976   if (b)
1977      XMesaDestroyBuffer(b);
1978   /* don't destroy X pixmap */
1979}
1980
1981
1982PUBLIC GLXPbuffer
1983glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList)
1984{
1985   XMesaVisual xmvis = (XMesaVisual) config;
1986   XMesaBuffer xmbuf;
1987   const int *attrib;
1988   int width = 0, height = 0;
1989   GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
1990
1991   (void) dpy;
1992
1993   for (attrib = attribList; *attrib; attrib++) {
1994      switch (*attrib) {
1995         case GLX_PBUFFER_WIDTH:
1996            attrib++;
1997            width = *attrib;
1998            break;
1999         case GLX_PBUFFER_HEIGHT:
2000            attrib++;
2001            height = *attrib;
2002            break;
2003         case GLX_PRESERVED_CONTENTS:
2004            attrib++;
2005            preserveContents = *attrib;
2006            break;
2007         case GLX_LARGEST_PBUFFER:
2008            attrib++;
2009            useLargest = *attrib;
2010            break;
2011         default:
2012            return 0;
2013      }
2014   }
2015
2016   if (width == 0 || height == 0)
2017      return 0;
2018
2019   if (width > MAX_WIDTH || height > MAX_HEIGHT) {
2020      /* If allocation would have failed and GLX_LARGEST_PBUFFER is set,
2021       * allocate the largest possible buffer.
2022       */
2023      if (useLargest) {
2024         width = MAX_WIDTH;
2025         height = MAX_HEIGHT;
2026      }
2027   }
2028
2029   xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2030   /* A GLXPbuffer handle must be an X Drawable because that's what
2031    * glXMakeCurrent takes.
2032    */
2033   if (xmbuf) {
2034      xmbuf->largestPbuffer = useLargest;
2035      xmbuf->preservedContents = preserveContents;
2036      return (GLXPbuffer) xmbuf->drawable;
2037   }
2038   else {
2039      return 0;
2040   }
2041}
2042
2043
2044PUBLIC void
2045glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf )
2046{
2047   XMesaBuffer b = XMesaFindBuffer(dpy, pbuf);
2048   if (b) {
2049      XMesaDestroyBuffer(b);
2050   }
2051}
2052
2053
2054PUBLIC void
2055glXQueryDrawable(Display *dpy, GLXDrawable draw, int attribute,
2056                 unsigned int *value)
2057{
2058   GLuint width, height;
2059   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, draw);
2060   if (!xmbuf)
2061      return;
2062
2063   /* make sure buffer's dimensions are up to date */
2064   xmesa_get_window_size(dpy, xmbuf, &width, &height);
2065
2066   switch (attribute) {
2067      case GLX_WIDTH:
2068         *value = width;
2069         break;
2070      case GLX_HEIGHT:
2071         *value = height;
2072         break;
2073      case GLX_PRESERVED_CONTENTS:
2074         *value = xmbuf->preservedContents;
2075         break;
2076      case GLX_LARGEST_PBUFFER:
2077         *value = xmbuf->largestPbuffer;
2078         break;
2079      case GLX_FBCONFIG_ID:
2080         *value = xmbuf->xm_visual->visinfo->visualid;
2081         return;
2082#ifdef GLX_EXT_texture_from_pixmap
2083      case GLX_TEXTURE_FORMAT_EXT:
2084         *value = xmbuf->TextureFormat;
2085         break;
2086      case GLX_TEXTURE_TARGET_EXT:
2087         *value = xmbuf->TextureTarget;
2088         break;
2089      case GLX_MIPMAP_TEXTURE_EXT:
2090         *value = xmbuf->TextureMipmap;
2091         break;
2092#endif
2093
2094      default:
2095         return; /* raise BadValue error */
2096   }
2097}
2098
2099
2100PUBLIC GLXContext
2101glXCreateNewContext( Display *dpy, GLXFBConfig config,
2102                     int renderType, GLXContext shareCtx, Bool direct )
2103{
2104   XMesaVisual xmvis = (XMesaVisual) config;
2105
2106   if (!dpy || !config ||
2107       (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2108      return 0;
2109
2110   return create_context(dpy, xmvis,
2111                         shareCtx ? shareCtx->xmesaContext : NULL,
2112                         direct,
2113                         1, 0, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB, 0x0);
2114}
2115
2116
2117PUBLIC int
2118glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
2119{
2120   GLXContext glxCtx = ctx;
2121   XMesaContext xmctx = glxCtx->xmesaContext;
2122
2123   (void) dpy;
2124   (void) ctx;
2125
2126   switch (attribute) {
2127   case GLX_FBCONFIG_ID:
2128      *value = xmctx->xm_visual->visinfo->visualid;
2129      break;
2130   case GLX_RENDER_TYPE:
2131      if (xmctx->xm_visual->mesa_visual.rgbMode)
2132         *value = GLX_RGBA_TYPE;
2133      else
2134         *value = GLX_COLOR_INDEX_TYPE;
2135      break;
2136   case GLX_SCREEN:
2137      *value = 0;
2138      return Success;
2139   default:
2140      return GLX_BAD_ATTRIBUTE;
2141   }
2142   return 0;
2143}
2144
2145
2146PUBLIC void
2147glXSelectEvent( Display *dpy, GLXDrawable drawable, unsigned long mask )
2148{
2149   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2150   if (xmbuf)
2151      xmbuf->selectedEvents = mask;
2152}
2153
2154
2155PUBLIC void
2156glXGetSelectedEvent(Display *dpy, GLXDrawable drawable, unsigned long *mask)
2157{
2158   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2159   if (xmbuf)
2160      *mask = xmbuf->selectedEvents;
2161   else
2162      *mask = 0;
2163}
2164
2165
2166
2167/*** GLX_SGI_swap_control ***/
2168
2169PUBLIC int
2170glXSwapIntervalSGI(int interval)
2171{
2172   (void) interval;
2173   return 0;
2174}
2175
2176
2177
2178/*** GLX_SGI_video_sync ***/
2179
2180static unsigned int FrameCounter = 0;
2181
2182PUBLIC int
2183glXGetVideoSyncSGI(unsigned int *count)
2184{
2185   /* this is a bogus implementation */
2186   *count = FrameCounter++;
2187   return 0;
2188}
2189
2190PUBLIC int
2191glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count)
2192{
2193   if (divisor <= 0 || remainder < 0)
2194      return GLX_BAD_VALUE;
2195   /* this is a bogus implementation */
2196   FrameCounter++;
2197   while (FrameCounter % divisor != remainder)
2198      FrameCounter++;
2199   *count = FrameCounter;
2200   return 0;
2201}
2202
2203
2204
2205/*** GLX_SGI_make_current_read ***/
2206
2207PUBLIC Bool
2208glXMakeCurrentReadSGI(Display *dpy, GLXDrawable draw, GLXDrawable read,
2209                      GLXContext ctx)
2210{
2211   return glXMakeContextCurrent( dpy, draw, read, ctx );
2212}
2213
2214/* not used
2215static GLXDrawable
2216glXGetCurrentReadDrawableSGI(void)
2217{
2218   return 0;
2219}
2220*/
2221
2222
2223/*** GLX_SGIX_video_source ***/
2224#if defined(_VL_H)
2225
2226PUBLIC GLXVideoSourceSGIX
2227glXCreateGLXVideoSourceSGIX(Display *dpy, int screen, VLServer server,
2228                            VLPath path, int nodeClass, VLNode drainNode)
2229{
2230   (void) dpy;
2231   (void) screen;
2232   (void) server;
2233   (void) path;
2234   (void) nodeClass;
2235   (void) drainNode;
2236   return 0;
2237}
2238
2239PUBLIC void
2240glXDestroyGLXVideoSourceSGIX(Display *dpy, GLXVideoSourceSGIX src)
2241{
2242   (void) dpy;
2243   (void) src;
2244}
2245
2246#endif
2247
2248
2249/*** GLX_EXT_import_context ***/
2250
2251PUBLIC void
2252glXFreeContextEXT(Display *dpy, GLXContext context)
2253{
2254   (void) dpy;
2255   (void) context;
2256}
2257
2258PUBLIC GLXContextID
2259glXGetContextIDEXT(const GLXContext context)
2260{
2261   (void) context;
2262   return 0;
2263}
2264
2265PUBLIC GLXContext
2266glXImportContextEXT(Display *dpy, GLXContextID contextID)
2267{
2268   (void) dpy;
2269   (void) contextID;
2270   return 0;
2271}
2272
2273PUBLIC int
2274glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute,
2275                       int *value)
2276{
2277   (void) dpy;
2278   (void) context;
2279   (void) attribute;
2280   (void) value;
2281   return 0;
2282}
2283
2284
2285
2286/*** GLX_SGIX_fbconfig ***/
2287
2288PUBLIC int
2289glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config,
2290                         int attribute, int *value)
2291{
2292   return glXGetFBConfigAttrib(dpy, config, attribute, value);
2293}
2294
2295PUBLIC GLXFBConfigSGIX *
2296glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list,
2297                      int *nelements)
2298{
2299   return (GLXFBConfig *) glXChooseFBConfig(dpy, screen,
2300                                            attrib_list, nelements);
2301}
2302
2303
2304PUBLIC GLXPixmap
2305glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2306                                 Pixmap pixmap)
2307{
2308   XMesaVisual xmvis = (XMesaVisual) config;
2309   XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
2310   return xmbuf->drawable; /* need to return an X ID */
2311}
2312
2313
2314PUBLIC GLXContext
2315glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2316                               int renderType, GLXContext shareCtx,
2317                               Bool direct)
2318{
2319   XMesaVisual xmvis = (XMesaVisual) config;
2320
2321   if (!dpy || !config ||
2322       (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2323      return 0;
2324
2325   return create_context(dpy, xmvis,
2326                         shareCtx ? shareCtx->xmesaContext : NULL,
2327                         direct,
2328                         1, 0, GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB, 0x0);
2329}
2330
2331
2332PUBLIC XVisualInfo *
2333glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config)
2334{
2335   return glXGetVisualFromFBConfig(dpy, config);
2336}
2337
2338
2339PUBLIC GLXFBConfigSGIX
2340glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis)
2341{
2342   XMesaVisual xmvis = find_glx_visual(dpy, vis);
2343   if (!xmvis) {
2344      /* This visual wasn't found with glXChooseVisual() */
2345      xmvis = create_glx_visual(dpy, vis);
2346   }
2347
2348   return (GLXFBConfigSGIX) xmvis;
2349}
2350
2351
2352
2353/*** GLX_SGIX_pbuffer ***/
2354
2355PUBLIC GLXPbufferSGIX
2356glXCreateGLXPbufferSGIX(Display *dpy, GLXFBConfigSGIX config,
2357                        unsigned int width, unsigned int height,
2358                        int *attribList)
2359{
2360   XMesaVisual xmvis = (XMesaVisual) config;
2361   XMesaBuffer xmbuf;
2362   const int *attrib;
2363   GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
2364
2365   (void) dpy;
2366
2367   for (attrib = attribList; attrib && *attrib; attrib++) {
2368      switch (*attrib) {
2369         case GLX_PRESERVED_CONTENTS_SGIX:
2370            attrib++;
2371            preserveContents = *attrib; /* ignored */
2372            break;
2373         case GLX_LARGEST_PBUFFER_SGIX:
2374            attrib++;
2375            useLargest = *attrib; /* ignored */
2376            break;
2377         default:
2378            return 0;
2379      }
2380   }
2381
2382   /* not used at this time */
2383   (void) useLargest;
2384   (void) preserveContents;
2385
2386   xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2387   /* A GLXPbuffer handle must be an X Drawable because that's what
2388    * glXMakeCurrent takes.
2389    */
2390   return (GLXPbuffer) xmbuf->drawable;
2391}
2392
2393
2394PUBLIC void
2395glXDestroyGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf)
2396{
2397   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2398   if (xmbuf) {
2399      XMesaDestroyBuffer(xmbuf);
2400   }
2401}
2402
2403
2404PUBLIC int
2405glXQueryGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf, int attribute,
2406                       unsigned int *value)
2407{
2408   const XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2409
2410   if (!xmbuf) {
2411      /* Generate GLXBadPbufferSGIX for bad pbuffer */
2412      return 0;
2413   }
2414
2415   switch (attribute) {
2416      case GLX_PRESERVED_CONTENTS_SGIX:
2417         *value = True;
2418         break;
2419      case GLX_LARGEST_PBUFFER_SGIX:
2420         *value = xmesa_buffer_width(xmbuf) * xmesa_buffer_height(xmbuf);
2421         break;
2422      case GLX_WIDTH_SGIX:
2423         *value = xmesa_buffer_width(xmbuf);
2424         break;
2425      case GLX_HEIGHT_SGIX:
2426         *value = xmesa_buffer_height(xmbuf);
2427         break;
2428      case GLX_EVENT_MASK_SGIX:
2429         *value = 0;  /* XXX might be wrong */
2430         break;
2431      default:
2432         *value = 0;
2433   }
2434   return 0;
2435}
2436
2437
2438PUBLIC void
2439glXSelectEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long mask)
2440{
2441   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2442   if (xmbuf) {
2443      /* Note: we'll never generate clobber events */
2444      xmbuf->selectedEvents = mask;
2445   }
2446}
2447
2448
2449PUBLIC void
2450glXGetSelectedEventSGIX(Display *dpy, GLXDrawable drawable,
2451                        unsigned long *mask)
2452{
2453   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2454   if (xmbuf) {
2455      *mask = xmbuf->selectedEvents;
2456   }
2457   else {
2458      *mask = 0;
2459   }
2460}
2461
2462
2463
2464/*** GLX_SGI_cushion ***/
2465
2466PUBLIC void
2467glXCushionSGI(Display *dpy, Window win, float cushion)
2468{
2469   (void) dpy;
2470   (void) win;
2471   (void) cushion;
2472}
2473
2474
2475
2476/*** GLX_SGIX_video_resize ***/
2477
2478PUBLIC int
2479glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel,
2480                           Window window)
2481{
2482   (void) dpy;
2483   (void) screen;
2484   (void) channel;
2485   (void) window;
2486   return 0;
2487}
2488
2489PUBLIC int
2490glXChannelRectSGIX(Display *dpy, int screen, int channel,
2491                   int x, int y, int w, int h)
2492{
2493   (void) dpy;
2494   (void) screen;
2495   (void) channel;
2496   (void) x;
2497   (void) y;
2498   (void) w;
2499   (void) h;
2500   return 0;
2501}
2502
2503PUBLIC int
2504glXQueryChannelRectSGIX(Display *dpy, int screen, int channel,
2505                        int *x, int *y, int *w, int *h)
2506{
2507   (void) dpy;
2508   (void) screen;
2509   (void) channel;
2510   (void) x;
2511   (void) y;
2512   (void) w;
2513   (void) h;
2514   return 0;
2515}
2516
2517PUBLIC int
2518glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel,
2519                          int *dx, int *dy, int *dw, int *dh)
2520{
2521   (void) dpy;
2522   (void) screen;
2523   (void) channel;
2524   (void) dx;
2525   (void) dy;
2526   (void) dw;
2527   (void) dh;
2528   return 0;
2529}
2530
2531PUBLIC int
2532glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype)
2533{
2534   (void) dpy;
2535   (void) screen;
2536   (void) channel;
2537   (void) synctype;
2538   return 0;
2539}
2540
2541
2542
2543/*** GLX_SGIX_dmbuffer **/
2544
2545#if defined(_DM_BUFFER_H_)
2546PUBLIC Bool
2547glXAssociateDMPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuffer,
2548                          DMparams *params, DMbuffer dmbuffer)
2549{
2550   (void) dpy;
2551   (void) pbuffer;
2552   (void) params;
2553   (void) dmbuffer;
2554   return False;
2555}
2556#endif
2557
2558
2559/*** GLX_SGIX_swap_group ***/
2560
2561PUBLIC void
2562glXJoinSwapGroupSGIX(Display *dpy, GLXDrawable drawable, GLXDrawable member)
2563{
2564   (void) dpy;
2565   (void) drawable;
2566   (void) member;
2567}
2568
2569
2570
2571/*** GLX_SGIX_swap_barrier ***/
2572
2573PUBLIC void
2574glXBindSwapBarrierSGIX(Display *dpy, GLXDrawable drawable, int barrier)
2575{
2576   (void) dpy;
2577   (void) drawable;
2578   (void) barrier;
2579}
2580
2581PUBLIC Bool
2582glXQueryMaxSwapBarriersSGIX(Display *dpy, int screen, int *max)
2583{
2584   (void) dpy;
2585   (void) screen;
2586   (void) max;
2587   return False;
2588}
2589
2590
2591
2592/*** GLX_SUN_get_transparent_index ***/
2593
2594PUBLIC Status
2595glXGetTransparentIndexSUN(Display *dpy, Window overlay, Window underlay,
2596                          long *pTransparent)
2597{
2598   (void) dpy;
2599   (void) overlay;
2600   (void) underlay;
2601   (void) pTransparent;
2602   return 0;
2603}
2604
2605
2606
2607/*** GLX_MESA_release_buffers ***/
2608
2609/*
2610 * Release the depth, stencil, accum buffers attached to a GLXDrawable
2611 * (a window or pixmap) prior to destroying the GLXDrawable.
2612 */
2613PUBLIC Bool
2614glXReleaseBuffersMESA( Display *dpy, GLXDrawable d )
2615{
2616   XMesaBuffer b = XMesaFindBuffer(dpy, d);
2617   if (b) {
2618      XMesaDestroyBuffer(b);
2619      return True;
2620   }
2621   return False;
2622}
2623
2624/*** GLX_EXT_texture_from_pixmap ***/
2625
2626PUBLIC void
2627glXBindTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer,
2628                        const int *attrib_list)
2629{
2630   XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2631   if (b)
2632      XMesaBindTexImage(dpy, b, buffer, attrib_list);
2633}
2634
2635PUBLIC void
2636glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
2637{
2638   XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2639   if (b)
2640      XMesaReleaseTexImage(dpy, b, buffer);
2641}
2642
2643
2644
2645/*** GLX_ARB_create_context ***/
2646
2647GLXContext
2648glXCreateContextAttribsARB(Display *dpy, GLXFBConfig config,
2649                           GLXContext shareCtx, Bool direct,
2650                           const int *attrib_list)
2651{
2652   XMesaVisual xmvis = (XMesaVisual) config;
2653   int majorVersion = 1, minorVersion = 0;
2654   int contextFlags = 0x0;
2655   int profileMask = GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
2656   int renderType = GLX_RGBA_TYPE;
2657   unsigned i;
2658   Bool done = False;
2659   const int contextFlagsAll = (GLX_CONTEXT_DEBUG_BIT_ARB |
2660                                GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB);
2661
2662   /* parse attrib_list */
2663   for (i = 0; !done && attrib_list[i]; i++) {
2664      switch (attrib_list[i]) {
2665      case GLX_CONTEXT_MAJOR_VERSION_ARB:
2666         majorVersion = attrib_list[++i];
2667         break;
2668      case GLX_CONTEXT_MINOR_VERSION_ARB:
2669         minorVersion = attrib_list[++i];
2670         break;
2671      case GLX_CONTEXT_FLAGS_ARB:
2672         contextFlags = attrib_list[++i];
2673         break;
2674      case GLX_CONTEXT_PROFILE_MASK_ARB:
2675         profileMask = attrib_list[++i];
2676         break;
2677      case GLX_RENDER_TYPE:
2678         renderType = attrib_list[++i];
2679         break;
2680      case 0:
2681         /* end of list */
2682         done = True;
2683         break;
2684      default:
2685         /* bad attribute */
2686         /* XXX generate BadValue X Error */
2687         return NULL;
2688      }
2689   }
2690
2691   /* check contextFlags */
2692   if (contextFlags & ~contextFlagsAll) {
2693      return NULL; /* generate BadValue X Error */
2694   }
2695
2696   /* check profileMask */
2697   if (profileMask != GLX_CONTEXT_CORE_PROFILE_BIT_ARB &&
2698       profileMask != GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB) {
2699      return NULL; /* generate BadValue X Error */
2700   }
2701
2702   /* check version (generate BadMatch if bad) */
2703   switch (majorVersion) {
2704   case 1:
2705      if (minorVersion < 0 || minorVersion > 5)
2706         return NULL;
2707      break;
2708   case 2:
2709      if (minorVersion < 0 || minorVersion > 1)
2710         return NULL;
2711      break;
2712   case 3:
2713      if (minorVersion < 0 || minorVersion > 2)
2714         return NULL;
2715      break;
2716   case 4:
2717      if (minorVersion < 0 || minorVersion > 0)
2718         return NULL;
2719      break;
2720   default:
2721      return NULL;
2722   }
2723
2724   if ((contextFlags & GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) &&
2725       majorVersion < 3)
2726      return NULL; /* generate GLXBadProfileARB */
2727
2728   if (renderType == GLX_COLOR_INDEX_TYPE && majorVersion >= 3)
2729      return NULL; /* generate BadMatch */
2730
2731   return create_context(dpy, xmvis,
2732                         shareCtx ? shareCtx->xmesaContext : NULL,
2733                         direct,
2734                         majorVersion, minorVersion,
2735                         profileMask, contextFlags);
2736}
2737