xm_api.c revision 1636328b0adefcebcc204d63980184a6d592efae 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.1
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25/**
26 * \file xm_api.c
27 *
28 * All the XMesa* API functions.
29 *
30 *
31 * NOTES:
32 *
33 * The window coordinate system origin (0,0) is in the lower-left corner
34 * of the window.  X11's window coordinate origin is in the upper-left
35 * corner of the window.  Therefore, most drawing functions in this
36 * file have to flip Y coordinates.
37 *
38 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
39 * in support for the MIT Shared Memory extension.  If enabled, when you
40 * use an Ximage for the back buffer in double buffered mode, the "swap"
41 * operation will be faster.  You must also link with -lXext.
42 *
43 * Byte swapping:  If the Mesa host and the X display use a different
44 * byte order then there's some trickiness to be aware of when using
45 * XImages.  The byte ordering used for the XImage is that of the X
46 * display, not the Mesa host.
47 * The color-to-pixel encoding for True/DirectColor must be done
48 * according to the display's visual red_mask, green_mask, and blue_mask.
49 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
50 * do byte swapping if needed.  If one wants to directly "poke" the pixel
51 * into the XImage's buffer then the pixel must be byte swapped first.  In
52 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
53 * and use XPutPixel everywhere except in the implementation of
54 * glClear(GL_COLOR_BUFFER_BIT).  We want this function to be fast so
55 * instead of using XPutPixel we "poke" our values after byte-swapping
56 * the clear pixel value if needed.
57 *
58 */
59
60#ifdef __CYGWIN__
61#undef WIN32
62#undef __WIN32__
63#endif
64
65#include "glxheader.h"
66#include "xmesaP.h"
67#include "main/context.h"
68#include "main/extensions.h"
69#include "main/framebuffer.h"
70#include "main/imports.h"
71#include "main/macros.h"
72#include "main/renderbuffer.h"
73#include "main/teximage.h"
74#include "glapi/glthread.h"
75#include "swrast/swrast.h"
76#include "swrast_setup/swrast_setup.h"
77#include "vbo/vbo.h"
78#include "tnl/tnl.h"
79#include "tnl/t_context.h"
80#include "tnl/t_pipeline.h"
81#include "drivers/common/driverfuncs.h"
82
83/**
84 * Global X driver lock
85 */
86_glthread_Mutex _xmesa_lock;
87
88
89
90/**
91 * Lookup tables for HPCR pixel format:
92 */
93static short hpcr_rgbTbl[3][256] = {
94{
95 16,  16,  17,  17,  18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  23,
96 24,  24,  25,  25,  26,  26,  27,  27,  28,  28,  29,  29,  30,  30,  31,  31,
97 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
98 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
99 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
100 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
101 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
102 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
103112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
104128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
105144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
106160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
107176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
108192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
109208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
110224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
111},
112{
113 16,  16,  17,  17,  18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  23,
114 24,  24,  25,  25,  26,  26,  27,  27,  28,  28,  29,  29,  30,  30,  31,  31,
115 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
116 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
117 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
118 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
119 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
120 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
121112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
122128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
123144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
124160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
125176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
126192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
127208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
128224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
129},
130{
131 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
132 40,  40,  41,  41,  42,  42,  43,  43,  44,  44,  45,  45,  46,  46,  47,  47,
133 48,  48,  49,  49,  50,  50,  51,  51,  52,  52,  53,  53,  54,  54,  55,  55,
134 56,  56,  57,  57,  58,  58,  59,  59,  60,  60,  61,  61,  62,  62,  63,  63,
135 64,  64,  65,  65,  66,  66,  67,  67,  68,  68,  69,  69,  70,  70,  71,  71,
136 72,  72,  73,  73,  74,  74,  75,  75,  76,  76,  77,  77,  78,  78,  79,  79,
137 80,  80,  81,  81,  82,  82,  83,  83,  84,  84,  85,  85,  86,  86,  87,  87,
138 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
139 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
140112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
141128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
142144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
143160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
144176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
145192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
146208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
147}
148};
149
150
151
152/**********************************************************************/
153/*****                     X Utility Functions                    *****/
154/**********************************************************************/
155
156
157/**
158 * Return the host's byte order as LSBFirst or MSBFirst ala X.
159 */
160#ifndef XFree86Server
161static int host_byte_order( void )
162{
163   int i = 1;
164   char *cptr = (char *) &i;
165   return (*cptr==1) ? LSBFirst : MSBFirst;
166}
167#endif
168
169
170/**
171 * Check if the X Shared Memory extension is available.
172 * Return:  0 = not available
173 *          1 = shared XImage support available
174 *          2 = shared Pixmap support available also
175 */
176static int check_for_xshm( XMesaDisplay *display )
177{
178#if defined(USE_XSHM) && !defined(XFree86Server)
179   int major, minor, ignore;
180   Bool pixmaps;
181
182   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
183      if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
184	 return (pixmaps==True) ? 2 : 1;
185      }
186      else {
187	 return 0;
188      }
189   }
190   else {
191      return 0;
192   }
193#else
194   /* No  XSHM support */
195   return 0;
196#endif
197}
198
199
200/**
201 * Apply gamma correction to an intensity value in [0..max].  Return the
202 * new intensity value.
203 */
204static GLint
205gamma_adjust( GLfloat gamma, GLint value, GLint max )
206{
207   if (gamma == 1.0) {
208      return value;
209   }
210   else {
211      double x = (double) value / (double) max;
212      return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
213   }
214}
215
216
217
218/**
219 * Return the true number of bits per pixel for XImages.
220 * For example, if we request a 24-bit deep visual we may actually need/get
221 * 32bpp XImages.  This function returns the appropriate bpp.
222 * Input:  dpy - the X display
223 *         visinfo - desribes the visual to be used for XImages
224 * Return:  true number of bits per pixel for XImages
225 */
226static int
227bits_per_pixel( XMesaVisual xmv )
228{
229#ifdef XFree86Server
230   const int depth = xmv->nplanes;
231   int i;
232   assert(depth > 0);
233   for (i = 0; i < screenInfo.numPixmapFormats; i++) {
234      if (screenInfo.formats[i].depth == depth)
235         return screenInfo.formats[i].bitsPerPixel;
236   }
237   return depth;  /* should never get here, but this should be safe */
238#else
239   XMesaDisplay *dpy = xmv->display;
240   XMesaVisualInfo visinfo = xmv->visinfo;
241   XMesaImage *img;
242   int bitsPerPixel;
243   /* Create a temporary XImage */
244   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
245		       ZPixmap, 0,           /*format, offset*/
246		       (char*) MALLOC(8),    /*data*/
247		       1, 1,                 /*width, height*/
248		       32,                   /*bitmap_pad*/
249		       0                     /*bytes_per_line*/
250                     );
251   assert(img);
252   /* grab the bits/pixel value */
253   bitsPerPixel = img->bits_per_pixel;
254   /* free the XImage */
255   _mesa_free( img->data );
256   img->data = NULL;
257   XMesaDestroyImage( img );
258   return bitsPerPixel;
259#endif
260}
261
262
263
264/*
265 * Determine if a given X window ID is valid (window exists).
266 * Do this by calling XGetWindowAttributes() for the window and
267 * checking if we catch an X error.
268 * Input:  dpy - the display
269 *         win - the window to check for existance
270 * Return:  GL_TRUE - window exists
271 *          GL_FALSE - window doesn't exist
272 */
273#ifndef XFree86Server
274static GLboolean WindowExistsFlag;
275
276static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
277{
278   (void) dpy;
279   if (xerr->error_code == BadWindow) {
280      WindowExistsFlag = GL_FALSE;
281   }
282   return 0;
283}
284
285static GLboolean window_exists( XMesaDisplay *dpy, Window win )
286{
287   XWindowAttributes wa;
288   int (*old_handler)( XMesaDisplay*, XErrorEvent* );
289   WindowExistsFlag = GL_TRUE;
290   old_handler = XSetErrorHandler(window_exists_err_handler);
291   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
292   XSetErrorHandler(old_handler);
293   return WindowExistsFlag;
294}
295
296static Status
297get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
298{
299   Window root;
300   Status stat;
301   int xpos, ypos;
302   unsigned int w, h, bw, depth;
303   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
304   *width = w;
305   *height = h;
306   return stat;
307}
308#endif
309
310
311/**
312 * Return the size of the window (or pixmap) that corresponds to the
313 * given XMesaBuffer.
314 * \param width  returns width in pixels
315 * \param height  returns height in pixels
316 */
317void
318xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
319                      GLuint *width, GLuint *height)
320{
321#ifdef XFree86Server
322   *width = MIN2(b->frontxrb->drawable->width, MAX_WIDTH);
323   *height = MIN2(b->frontxrb->drawable->height, MAX_HEIGHT);
324#else
325   Status stat;
326
327   _glthread_LOCK_MUTEX(_xmesa_lock);
328   XSync(b->xm_visual->display, 0); /* added for Chromium */
329   stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
330   _glthread_UNLOCK_MUTEX(_xmesa_lock);
331
332   if (!stat) {
333      /* probably querying a window that's recently been destroyed */
334      _mesa_warning(NULL, "XGetGeometry failed!\n");
335      *width = *height = 1;
336   }
337#endif
338}
339
340
341
342/**********************************************************************/
343/*****                Linked list of XMesaBuffers                 *****/
344/**********************************************************************/
345
346XMesaBuffer XMesaBufferList = NULL;
347
348
349/**
350 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
351 * Note that XMesaBuffer is derived from GLframebuffer.
352 * The new XMesaBuffer will not have any size (Width=Height=0).
353 *
354 * \param d  the corresponding X drawable (window or pixmap)
355 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
356 * \param vis  the buffer's visual
357 * \param cmap  the window's colormap, if known.
358 * \return new XMesaBuffer or NULL if any problem
359 */
360static XMesaBuffer
361create_xmesa_buffer(XMesaDrawable d, BufferType type,
362                    XMesaVisual vis, XMesaColormap cmap)
363{
364   XMesaBuffer b;
365
366   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
367
368   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
369   if (!b)
370      return NULL;
371
372   b->display = vis->display;
373   b->xm_visual = vis;
374   b->type = type;
375   b->cmap = cmap;
376
377   _mesa_initialize_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
378   b->mesa_buffer.Delete = xmesa_delete_framebuffer;
379
380   /*
381    * Front renderbuffer
382    */
383   b->frontxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_FALSE);
384   if (!b->frontxrb) {
385      _mesa_free(b);
386      return NULL;
387   }
388   b->frontxrb->Parent = b;
389   b->frontxrb->drawable = d;
390   b->frontxrb->pixmap = (XMesaPixmap) d;
391   _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
392                          &b->frontxrb->Base);
393
394   /*
395    * Back renderbuffer
396    */
397   if (vis->mesa_visual.doubleBufferMode) {
398      b->backxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_TRUE);
399      if (!b->backxrb) {
400         /* XXX free front xrb too */
401         _mesa_free(b);
402         return NULL;
403      }
404      b->backxrb->Parent = b;
405      /* determine back buffer implementation */
406      b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
407
408      _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
409                             &b->backxrb->Base);
410   }
411
412   /*
413    * Software alpha planes
414    */
415   if (vis->mesa_visual.alphaBits > 0
416       && vis->undithered_pf != PF_8A8B8G8R
417       && vis->undithered_pf != PF_8A8R8G8B) {
418      /* Visual has alpha, but pixel format doesn't support it.
419       * We'll use an alpha renderbuffer wrapper.
420       */
421      b->swAlpha = GL_TRUE;
422   }
423   else {
424      b->swAlpha = GL_FALSE;
425   }
426
427   /*
428    * Other renderbuffer (depth, stencil, etc)
429    */
430   _mesa_add_soft_renderbuffers(&b->mesa_buffer,
431                                GL_FALSE,  /* color */
432                                vis->mesa_visual.haveDepthBuffer,
433                                vis->mesa_visual.haveStencilBuffer,
434                                vis->mesa_visual.haveAccumBuffer,
435                                b->swAlpha,
436                                vis->mesa_visual.numAuxBuffers > 0 );
437
438   /* GLX_EXT_texture_from_pixmap */
439   b->TextureTarget = 0;
440   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
441   b->TextureMipmap = 0;
442
443   /* insert buffer into linked list */
444   b->Next = XMesaBufferList;
445   XMesaBufferList = b;
446
447   return b;
448}
449
450
451/**
452 * Find an XMesaBuffer by matching X display and colormap but NOT matching
453 * the notThis buffer.
454 */
455XMesaBuffer
456xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
457{
458   XMesaBuffer b;
459   for (b=XMesaBufferList; b; b=b->Next) {
460      if (b->display==dpy && b->cmap==cmap && b!=notThis) {
461         return b;
462      }
463   }
464   return NULL;
465}
466
467
468/**
469 * Remove buffer from linked list, delete if no longer referenced.
470 */
471static void
472xmesa_free_buffer(XMesaBuffer buffer)
473{
474   XMesaBuffer prev = NULL, b;
475
476   for (b = XMesaBufferList; b; b = b->Next) {
477      if (b == buffer) {
478         struct gl_framebuffer *fb = &buffer->mesa_buffer;
479
480         /* unlink buffer from list */
481         if (prev)
482            prev->Next = buffer->Next;
483         else
484            XMesaBufferList = buffer->Next;
485
486         /* mark as delete pending */
487         fb->DeletePending = GL_TRUE;
488
489         /* Since the X window for the XMesaBuffer is going away, we don't
490          * want to dereference this pointer in the future.
491          */
492         b->frontxrb->drawable = 0;
493
494         /* Unreference.  If count = zero we'll really delete the buffer */
495         _mesa_unreference_framebuffer(&fb);
496
497         return;
498      }
499      /* continue search */
500      prev = b;
501   }
502   /* buffer not found in XMesaBufferList */
503   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
504}
505
506
507/**
508 * Copy X color table stuff from one XMesaBuffer to another.
509 */
510static void
511copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
512{
513   MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
514   MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
515   MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
516   MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
517   dst->num_alloced = src->num_alloced;
518   MEMCPY(dst->alloced_colors, src->alloced_colors,
519          sizeof(src->alloced_colors));
520}
521
522
523
524/**********************************************************************/
525/*****                   Misc Private Functions                   *****/
526/**********************************************************************/
527
528
529/**
530 * A replacement for XAllocColor.  This function should never
531 * fail to allocate a color.  When XAllocColor fails, we return
532 * the nearest matching color.  If we have to allocate many colors
533 * this function isn't too efficient; the XQueryColors() could be
534 * done just once.
535 * Written by Michael Pichler, Brian Paul, Mark Kilgard
536 * Input:  dpy - X display
537 *         cmap - X colormap
538 *         cmapSize - size of colormap
539 * In/Out: color - the XColor struct
540 * Output:  exact - 1=exact color match, 0=closest match
541 *          alloced - 1=XAlloc worked, 0=XAlloc failed
542 */
543static void
544noFaultXAllocColor( int client,
545                    XMesaDisplay *dpy,
546                    XMesaColormap cmap,
547                    int cmapSize,
548                    XMesaColor *color,
549                    int *exact, int *alloced )
550{
551#ifdef XFree86Server
552   Pixel *ppixIn;
553   xrgb *ctable;
554#else
555   /* we'll try to cache ctable for better remote display performance */
556   static Display *prevDisplay = NULL;
557   static XMesaColormap prevCmap = 0;
558   static int prevCmapSize = 0;
559   static XMesaColor *ctable = NULL;
560#endif
561   XMesaColor subColor;
562   int i, bestmatch;
563   double mindist;       /* 3*2^16^2 exceeds long int precision. */
564
565   (void) client;
566
567   /* First try just using XAllocColor. */
568#ifdef XFree86Server
569   if (AllocColor(cmap,
570		  &color->red, &color->green, &color->blue,
571		  &color->pixel,
572		  client) == Success)
573#else
574   if (XAllocColor(dpy, cmap, color))
575#endif
576   {
577      *exact = 1;
578      *alloced = 1;
579      return;
580   }
581
582   /* Alloc failed, search for closest match */
583
584   /* Retrieve color table entries. */
585   /* XXX alloca candidate. */
586#ifdef XFree86Server
587   ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
588   ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
589   for (i = 0; i < cmapSize; i++) {
590      ppixIn[i] = i;
591   }
592   QueryColors(cmap, cmapSize, ppixIn, ctable);
593#else
594   if (prevDisplay != dpy || prevCmap != cmap
595       || prevCmapSize != cmapSize || !ctable) {
596      /* free previously cached color table */
597      if (ctable)
598         _mesa_free(ctable);
599      /* Get the color table from X */
600      ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
601      assert(ctable);
602      for (i = 0; i < cmapSize; i++) {
603         ctable[i].pixel = i;
604      }
605      XQueryColors(dpy, cmap, ctable, cmapSize);
606      prevDisplay = dpy;
607      prevCmap = cmap;
608      prevCmapSize = cmapSize;
609   }
610#endif
611
612   /* Find best match. */
613   bestmatch = -1;
614   mindist = 0.0;
615   for (i = 0; i < cmapSize; i++) {
616      double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
617      double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
618      double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
619      double dist = dr * dr + dg * dg + db * db;
620      if (bestmatch < 0 || dist < mindist) {
621         bestmatch = i;
622         mindist = dist;
623      }
624   }
625
626   /* Return result. */
627   subColor.red   = ctable[bestmatch].red;
628   subColor.green = ctable[bestmatch].green;
629   subColor.blue  = ctable[bestmatch].blue;
630   /* Try to allocate the closest match color.  This should only
631    * fail if the cell is read/write.  Otherwise, we're incrementing
632    * the cell's reference count.
633    */
634#ifdef XFree86Server
635   if (AllocColor(cmap,
636		  &subColor.red, &subColor.green, &subColor.blue,
637		  &subColor.pixel,
638		  client) == Success) {
639#else
640   if (XAllocColor(dpy, cmap, &subColor)) {
641#endif
642      *alloced = 1;
643   }
644   else {
645      /* do this to work around a problem reported by Frank Ortega */
646      subColor.pixel = (unsigned long) bestmatch;
647      subColor.red   = ctable[bestmatch].red;
648      subColor.green = ctable[bestmatch].green;
649      subColor.blue  = ctable[bestmatch].blue;
650      subColor.flags = DoRed | DoGreen | DoBlue;
651      *alloced = 0;
652   }
653#ifdef XFree86Server
654   _mesa_free(ppixIn);
655   _mesa_free(ctable);
656#else
657   /* don't free table, save it for next time */
658#endif
659
660   *color = subColor;
661   *exact = 0;
662}
663
664
665
666/**
667 * Do setup for PF_GRAYSCALE pixel format.
668 * Note that buffer may be NULL.
669 */
670static GLboolean
671setup_grayscale(int client, XMesaVisual v,
672                XMesaBuffer buffer, XMesaColormap cmap)
673{
674   if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
675      return GL_FALSE;
676   }
677
678   if (buffer) {
679      XMesaBuffer prevBuffer;
680
681      if (!cmap) {
682         return GL_FALSE;
683      }
684
685      prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
686      if (prevBuffer &&
687          (buffer->xm_visual->mesa_visual.rgbMode ==
688           prevBuffer->xm_visual->mesa_visual.rgbMode)) {
689         /* Copy colormap stuff from previous XMesaBuffer which uses same
690          * X colormap.  Do this to avoid time spent in noFaultXAllocColor.
691          */
692         copy_colortable_info(buffer, prevBuffer);
693      }
694      else {
695         /* Allocate 256 shades of gray */
696         int gray;
697         int colorsfailed = 0;
698         for (gray=0;gray<256;gray++) {
699            GLint r = gamma_adjust( v->RedGamma,   gray, 255 );
700            GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
701            GLint b = gamma_adjust( v->BlueGamma,  gray, 255 );
702            int exact, alloced;
703            XMesaColor xcol;
704            xcol.red   = (r << 8) | r;
705            xcol.green = (g << 8) | g;
706            xcol.blue  = (b << 8) | b;
707            noFaultXAllocColor( client, v->display,
708                                cmap, GET_COLORMAP_SIZE(v),
709                                &xcol, &exact, &alloced );
710            if (!exact) {
711               colorsfailed++;
712            }
713            if (alloced) {
714               assert(buffer->num_alloced<256);
715               buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
716               buffer->num_alloced++;
717            }
718
719            /*OLD
720            assert(gray < 576);
721            buffer->color_table[gray*3+0] = xcol.pixel;
722            buffer->color_table[gray*3+1] = xcol.pixel;
723            buffer->color_table[gray*3+2] = xcol.pixel;
724            assert(xcol.pixel < 65536);
725            buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
726            buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
727            buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
728            */
729            buffer->color_table[gray] = xcol.pixel;
730            assert(xcol.pixel < 65536);
731            buffer->pixel_to_r[xcol.pixel] = gray;
732            buffer->pixel_to_g[xcol.pixel] = gray;
733            buffer->pixel_to_b[xcol.pixel] = gray;
734         }
735
736         if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
737            _mesa_warning(NULL,
738                  "Note: %d out of 256 needed colors do not match exactly.\n",
739                  colorsfailed );
740         }
741      }
742   }
743
744   v->dithered_pf = PF_Grayscale;
745   v->undithered_pf = PF_Grayscale;
746   return GL_TRUE;
747}
748
749
750
751/**
752 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
753 * or 8-bit TrueColor visual visual.  We try to allocate a palette of 225
754 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
755 * color.  While this function was originally designed just for 8-bit
756 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
757 * Dithering code contributed by Bob Mercier.
758 */
759static GLboolean
760setup_dithered_color(int client, XMesaVisual v,
761                     XMesaBuffer buffer, XMesaColormap cmap)
762{
763   if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
764      return GL_FALSE;
765   }
766
767   if (buffer) {
768      XMesaBuffer prevBuffer;
769
770      if (!cmap) {
771         return GL_FALSE;
772      }
773
774      prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
775      if (prevBuffer &&
776          (buffer->xm_visual->mesa_visual.rgbMode ==
777           prevBuffer->xm_visual->mesa_visual.rgbMode)) {
778         /* Copy colormap stuff from previous, matching XMesaBuffer.
779          * Do this to avoid time spent in noFaultXAllocColor.
780          */
781         copy_colortable_info(buffer, prevBuffer);
782      }
783      else {
784         /* Allocate X colors and initialize color_table[], red_table[], etc */
785         int r, g, b, i;
786         int colorsfailed = 0;
787         for (r = 0; r < DITH_R; r++) {
788            for (g = 0; g < DITH_G; g++) {
789               for (b = 0; b < DITH_B; b++) {
790                  XMesaColor xcol;
791                  int exact, alloced;
792                  xcol.red  =gamma_adjust(v->RedGamma,   r*65535/(DITH_R-1),65535);
793                  xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
794                  xcol.blue =gamma_adjust(v->BlueGamma,  b*65535/(DITH_B-1),65535);
795                  noFaultXAllocColor( client, v->display,
796                                      cmap, GET_COLORMAP_SIZE(v),
797                                      &xcol, &exact, &alloced );
798                  if (!exact) {
799                     colorsfailed++;
800                  }
801                  if (alloced) {
802                     assert(buffer->num_alloced<256);
803                     buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
804                     buffer->num_alloced++;
805                  }
806                  i = DITH_MIX( r, g, b );
807                  assert(i < 576);
808                  buffer->color_table[i] = xcol.pixel;
809                  assert(xcol.pixel < 65536);
810                  buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
811                  buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
812                  buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
813               }
814            }
815         }
816
817         if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
818            _mesa_warning(NULL,
819                  "Note: %d out of %d needed colors do not match exactly.\n",
820                  colorsfailed, DITH_R * DITH_G * DITH_B );
821         }
822      }
823   }
824
825   v->dithered_pf = PF_Dither;
826   v->undithered_pf = PF_Lookup;
827   return GL_TRUE;
828}
829
830
831/**
832 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
833 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
834 * Special dithering tables have to be initialized.
835 */
836static void
837setup_8bit_hpcr(XMesaVisual v)
838{
839   /* HP Color Recovery contributed by:  Alex De Bruyn (ad@lms.be)
840    * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
841    * on the root window AND the colormap obtainable by XGetRGBColormaps
842    * for that atom must be set on the window.  (see also tkInitWindow)
843    * If that colormap is not set, the output will look stripy.
844    */
845
846   /* Setup color tables with gamma correction */
847   int i;
848   double g;
849
850   g = 1.0 / v->RedGamma;
851   for (i=0; i<256; i++) {
852      GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
853      v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
854   }
855
856   g = 1.0 / v->GreenGamma;
857   for (i=0; i<256; i++) {
858      GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
859      v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
860   }
861
862   g = 1.0 / v->BlueGamma;
863   for (i=0; i<256; i++) {
864      GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
865      v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
866   }
867   v->undithered_pf = PF_HPCR;  /* can't really disable dithering for now */
868   v->dithered_pf = PF_HPCR;
869
870   /* which method should I use to clear */
871   /* GL_FALSE: keep the ordinary method  */
872   /* GL_TRUE : clear with dither pattern */
873   v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
874
875   if (v->hpcr_clear_flag) {
876      v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
877                                               DefaultRootWindow(v->display),
878                                               16, 2, 8);
879#ifndef XFree86Server
880      v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
881                                       0, 0, 16, 2, AllPlanes, ZPixmap);
882#endif
883   }
884}
885
886
887/**
888 * Setup RGB rendering for a window with a True/DirectColor visual.
889 */
890static void
891setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
892{
893   unsigned long rmask, gmask, bmask;
894   (void) buffer;
895   (void) cmap;
896
897   /* Compute red multiplier (mask) and bit shift */
898   v->rshift = 0;
899   rmask = GET_REDMASK(v);
900   while ((rmask & 1)==0) {
901      v->rshift++;
902      rmask = rmask >> 1;
903   }
904
905   /* Compute green multiplier (mask) and bit shift */
906   v->gshift = 0;
907   gmask = GET_GREENMASK(v);
908   while ((gmask & 1)==0) {
909      v->gshift++;
910      gmask = gmask >> 1;
911   }
912
913   /* Compute blue multiplier (mask) and bit shift */
914   v->bshift = 0;
915   bmask = GET_BLUEMASK(v);
916   while ((bmask & 1)==0) {
917      v->bshift++;
918      bmask = bmask >> 1;
919   }
920
921   /*
922    * Compute component-to-pixel lookup tables and dithering kernel
923    */
924   {
925      static GLubyte kernel[16] = {
926          0*16,  8*16,  2*16, 10*16,
927         12*16,  4*16, 14*16,  6*16,
928          3*16, 11*16,  1*16,  9*16,
929         15*16,  7*16, 13*16,  5*16,
930      };
931      GLint rBits = _mesa_bitcount(rmask);
932      GLint gBits = _mesa_bitcount(gmask);
933      GLint bBits = _mesa_bitcount(bmask);
934      GLint maxBits;
935      GLuint i;
936
937      /* convert pixel components in [0,_mask] to RGB values in [0,255] */
938      for (i=0; i<=rmask; i++)
939         v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
940      for (i=0; i<=gmask; i++)
941         v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
942      for (i=0; i<=bmask; i++)
943         v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
944
945      /* convert RGB values from [0,255] to pixel components */
946
947      for (i=0;i<256;i++) {
948         GLint r = gamma_adjust(v->RedGamma,   i, 255);
949         GLint g = gamma_adjust(v->GreenGamma, i, 255);
950         GLint b = gamma_adjust(v->BlueGamma,  i, 255);
951         v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
952         v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
953         v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
954      }
955      /* overflow protection */
956      for (i=256;i<512;i++) {
957         v->RtoPixel[i] = v->RtoPixel[255];
958         v->GtoPixel[i] = v->GtoPixel[255];
959         v->BtoPixel[i] = v->BtoPixel[255];
960      }
961
962      /* setup dithering kernel */
963      maxBits = rBits;
964      if (gBits > maxBits)  maxBits = gBits;
965      if (bBits > maxBits)  maxBits = bBits;
966      for (i=0;i<16;i++) {
967         v->Kernel[i] = kernel[i] >> maxBits;
968      }
969
970      v->undithered_pf = PF_Truecolor;
971      v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
972   }
973
974   /*
975    * Now check for TrueColor visuals which we can optimize.
976    */
977   if (   GET_REDMASK(v)  ==0x0000ff
978       && GET_GREENMASK(v)==0x00ff00
979       && GET_BLUEMASK(v) ==0xff0000
980       && CHECK_BYTE_ORDER(v)
981       && v->BitsPerPixel==32
982       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
983      /* common 32 bpp config used on SGI, Sun */
984      v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
985   }
986   else if (GET_REDMASK(v)  == 0xff0000
987         && GET_GREENMASK(v)== 0x00ff00
988         && GET_BLUEMASK(v) == 0x0000ff
989         && CHECK_BYTE_ORDER(v)
990         && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
991      if (v->BitsPerPixel==32) {
992         /* if 32 bpp, and visual indicates 8 bpp alpha channel */
993         if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
994            v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
995         else
996            v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
997      }
998      else if (v->BitsPerPixel == 24) {
999         v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
1000      }
1001   }
1002   else if (GET_REDMASK(v)  ==0xf800
1003       &&   GET_GREENMASK(v)==0x07e0
1004       &&   GET_BLUEMASK(v) ==0x001f
1005       && CHECK_BYTE_ORDER(v)
1006       && v->BitsPerPixel==16
1007       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1008      /* 5-6-5 RGB */
1009      v->undithered_pf = PF_5R6G5B;
1010      v->dithered_pf = PF_Dither_5R6G5B;
1011   }
1012   else if (GET_REDMASK(v)  ==0xe0
1013       &&   GET_GREENMASK(v)==0x1c
1014       &&   GET_BLUEMASK(v) ==0x03
1015       && CHECK_FOR_HPCR(v)) {
1016      /* 8-bit HP color recovery */
1017      setup_8bit_hpcr( v );
1018   }
1019}
1020
1021
1022
1023/**
1024 * Setup RGB rendering for a window with a monochrome visual.
1025 */
1026static void
1027setup_monochrome( XMesaVisual v, XMesaBuffer b )
1028{
1029   (void) b;
1030   v->dithered_pf = v->undithered_pf = PF_1Bit;
1031   /* if black=1 then we must flip pixel values */
1032   v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1033}
1034
1035
1036
1037/**
1038 * When a context is bound for the first time, we can finally finish
1039 * initializing the context's visual and buffer information.
1040 * \param v  the XMesaVisual to initialize
1041 * \param b  the XMesaBuffer to initialize (may be NULL)
1042 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
1043 * \param window  the window/pixmap we're rendering into
1044 * \param cmap  the colormap associated with the window/pixmap
1045 * \return GL_TRUE=success, GL_FALSE=failure
1046 */
1047static GLboolean
1048initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
1049                             GLboolean rgb_flag, XMesaDrawable window,
1050                             XMesaColormap cmap)
1051{
1052   int client = 0;
1053
1054#ifdef XFree86Server
1055   client = (window) ? CLIENT_ID(window->id) : 0;
1056#endif
1057
1058   ASSERT(!b || b->xm_visual == v);
1059
1060   /* Save true bits/pixel */
1061   v->BitsPerPixel = bits_per_pixel(v);
1062   assert(v->BitsPerPixel > 0);
1063
1064   if (rgb_flag == GL_FALSE) {
1065      /* COLOR-INDEXED WINDOW:
1066       * Even if the visual is TrueColor or DirectColor we treat it as
1067       * being color indexed.  This is weird but might be useful to someone.
1068       */
1069      v->dithered_pf = v->undithered_pf = PF_Index;
1070      v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1071   }
1072   else {
1073      /* RGB WINDOW:
1074       * We support RGB rendering into almost any kind of visual.
1075       */
1076      const int xclass = v->mesa_visual.visualType;
1077      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1078	 setup_truecolor( v, b, cmap );
1079      }
1080      else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1081	 setup_monochrome( v, b );
1082      }
1083      else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1084         if (!setup_grayscale( client, v, b, cmap )) {
1085            return GL_FALSE;
1086         }
1087      }
1088      else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1089               && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1090	 if (!setup_dithered_color( client, v, b, cmap )) {
1091            return GL_FALSE;
1092         }
1093      }
1094      else {
1095	 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1096	 return GL_FALSE;
1097      }
1098      v->mesa_visual.indexBits = 0;
1099
1100      if (_mesa_getenv("MESA_NO_DITHER")) {
1101	 v->dithered_pf = v->undithered_pf;
1102      }
1103   }
1104
1105
1106   /*
1107    * If MESA_INFO env var is set print out some debugging info
1108    * which can help Brian figure out what's going on when a user
1109    * reports bugs.
1110    */
1111   if (_mesa_getenv("MESA_INFO")) {
1112      _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1113      _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1114      _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1115      _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1116      _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1117      _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1118   }
1119
1120   if (b && window) {
1121      char *data;
1122
1123      /* Do window-specific initializations */
1124
1125      /* these should have been set in create_xmesa_buffer */
1126      ASSERT(b->frontxrb->drawable == window);
1127      ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1128
1129      /* Setup for single/double buffering */
1130      if (v->mesa_visual.doubleBufferMode) {
1131         /* Double buffered */
1132         b->shm = check_for_xshm( v->display );
1133      }
1134
1135      /* X11 graphics contexts */
1136#ifdef XFree86Server
1137      b->gc = CreateScratchGC(v->display, window->depth);
1138#else
1139      b->gc = XCreateGC( v->display, window, 0, NULL );
1140#endif
1141      XMesaSetFunction( v->display, b->gc, GXcopy );
1142
1143      /* cleargc - for glClear() */
1144#ifdef XFree86Server
1145      b->cleargc = CreateScratchGC(v->display, window->depth);
1146#else
1147      b->cleargc = XCreateGC( v->display, window, 0, NULL );
1148#endif
1149      XMesaSetFunction( v->display, b->cleargc, GXcopy );
1150
1151      /*
1152       * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1153       * Patch contributed by Michael Pichler May 15, 1995.
1154       */
1155#ifdef XFree86Server
1156      b->swapgc = CreateScratchGC(v->display, window->depth);
1157      {
1158         CARD32 v[1];
1159         v[0] = FALSE;
1160         dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1161      }
1162#else
1163      {
1164         XGCValues gcvalues;
1165         gcvalues.graphics_exposures = False;
1166         b->swapgc = XCreateGC(v->display, window,
1167                               GCGraphicsExposures, &gcvalues);
1168      }
1169#endif
1170      XMesaSetFunction( v->display, b->swapgc, GXcopy );
1171      /*
1172       * Set fill style and tile pixmap once for all for HPCR stuff
1173       * (instead of doing it each time in clear_color_HPCR_pixmap())
1174       * Initialize whole stuff
1175       * Patch contributed by Jacques Leroy March 8, 1998.
1176       */
1177      if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1178         int i;
1179         for (i = 0; i < 16; i++) {
1180            XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1181            XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1182         }
1183         XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1184                       b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1185         XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1186         XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1187      }
1188
1189      /* Initialize the row buffer XImage for use in write_color_span() */
1190      data = (char*) MALLOC(MAX_WIDTH*4);
1191#ifdef XFree86Server
1192      b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1, data);
1193#else
1194      b->rowimage = XCreateImage( v->display,
1195                                  v->visinfo->visual,
1196                                  v->visinfo->depth,
1197                                  ZPixmap, 0,           /*format, offset*/
1198                                  data,                 /*data*/
1199                                  MAX_WIDTH, 1,         /*width, height*/
1200                                  32,                   /*bitmap_pad*/
1201                                  0                     /*bytes_per_line*/ );
1202#endif
1203      if (!b->rowimage)
1204         return GL_FALSE;
1205   }
1206
1207   return GL_TRUE;
1208}
1209
1210
1211
1212/*
1213 * Convert an RGBA color to a pixel value.
1214 */
1215unsigned long
1216xmesa_color_to_pixel(GLcontext *ctx,
1217                     GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1218                     GLuint pixelFormat)
1219{
1220   XMesaContext xmesa = XMESA_CONTEXT(ctx);
1221   switch (pixelFormat) {
1222      case PF_Index:
1223         return 0;
1224      case PF_Truecolor:
1225         {
1226            unsigned long p;
1227            PACK_TRUECOLOR( p, r, g, b );
1228            return p;
1229         }
1230      case PF_8A8B8G8R:
1231         return PACK_8A8B8G8R( r, g, b, a );
1232      case PF_8A8R8G8B:
1233         return PACK_8A8R8G8B( r, g, b, a );
1234      case PF_8R8G8B:
1235         /* fall through */
1236      case PF_8R8G8B24:
1237         return PACK_8R8G8B( r, g, b );
1238      case PF_5R6G5B:
1239         return PACK_5R6G5B( r, g, b );
1240      case PF_Dither:
1241         {
1242            DITHER_SETUP;
1243            return DITHER( 1, 0, r, g, b );
1244         }
1245      case PF_1Bit:
1246         /* 382 = (3*255)/2 */
1247         return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1248      case PF_HPCR:
1249         return DITHER_HPCR(1, 1, r, g, b);
1250      case PF_Lookup:
1251         {
1252            LOOKUP_SETUP;
1253            return LOOKUP( r, g, b );
1254         }
1255      case PF_Grayscale:
1256         return GRAY_RGB( r, g, b );
1257      case PF_Dither_True:
1258         /* fall through */
1259      case PF_Dither_5R6G5B:
1260         {
1261            unsigned long p;
1262            PACK_TRUEDITHER(p, 1, 0, r, g, b);
1263            return p;
1264         }
1265      default:
1266         _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1267   }
1268   return 0;
1269}
1270
1271
1272#define NUM_VISUAL_TYPES   6
1273
1274/**
1275 * Convert an X visual type to a GLX visual type.
1276 *
1277 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1278 *        to be converted.
1279 * \return If \c visualType is a valid X visual type, a GLX visual type will
1280 *         be returned.  Otherwise \c GLX_NONE will be returned.
1281 *
1282 * \note
1283 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1284 * DRI CVS tree.
1285 */
1286static GLint
1287xmesa_convert_from_x_visual_type( int visualType )
1288{
1289    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1290	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
1291	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1292	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
1293    };
1294
1295    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1296	? glx_visual_types[ visualType ] : GLX_NONE;
1297}
1298
1299
1300/**********************************************************************/
1301/*****                       Public Functions                     *****/
1302/**********************************************************************/
1303
1304
1305#ifdef IN_DRI_DRIVER
1306#define need_GL_VERSION_1_3
1307#define need_GL_VERSION_1_4
1308#define need_GL_VERSION_1_5
1309#define need_GL_VERSION_2_0
1310
1311/* sw extensions for imaging */
1312#define need_GL_EXT_blend_color
1313#define need_GL_EXT_blend_minmax
1314#define need_GL_EXT_convolution
1315#define need_GL_EXT_histogram
1316#define need_GL_SGI_color_table
1317
1318/* sw extensions not associated with some GL version */
1319#define need_GL_ARB_shader_objects
1320#define need_GL_ARB_vertex_program
1321#define need_GL_APPLE_vertex_array_object
1322#define need_GL_ATI_fragment_shader
1323#define need_GL_EXT_depth_bounds_test
1324#define need_GL_EXT_framebuffer_object
1325#define need_GL_EXT_framebuffer_blit
1326#define need_GL_EXT_gpu_program_parameters
1327#define need_GL_EXT_paletted_texture
1328#define need_GL_IBM_multimode_draw_arrays
1329#define need_GL_MESA_resize_buffers
1330#define need_GL_NV_vertex_program
1331#define need_GL_NV_fragment_program
1332
1333#include "extension_helper.h"
1334#include "utils.h"
1335
1336const struct dri_extension card_extensions[] =
1337{
1338   { "GL_VERSION_1_3",			GL_VERSION_1_3_functions },
1339   { "GL_VERSION_1_4",			GL_VERSION_1_4_functions },
1340   { "GL_VERSION_1_5",			GL_VERSION_1_5_functions },
1341   { "GL_VERSION_2_0",			GL_VERSION_2_0_functions },
1342
1343   { "GL_EXT_blend_color",		GL_EXT_blend_color_functions },
1344   { "GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions },
1345   { "GL_EXT_convolution",		GL_EXT_convolution_functions },
1346   { "GL_EXT_histogram",		GL_EXT_histogram_functions },
1347   { "GL_SGI_color_table",		GL_SGI_color_table_functions },
1348
1349   { "GL_ARB_shader_objects",		GL_ARB_shader_objects_functions },
1350   { "GL_ARB_vertex_program",		GL_ARB_vertex_program_functions },
1351   { "GL_APPLE_vertex_array_object",	GL_APPLE_vertex_array_object_functions },
1352   { "GL_ATI_fragment_shader",		GL_ATI_fragment_shader_functions },
1353   { "GL_EXT_depth_bounds_test",	GL_EXT_depth_bounds_test_functions },
1354   { "GL_EXT_framebuffer_object",	GL_EXT_framebuffer_object_functions },
1355   { "GL_EXT_framebuffer_blit",		GL_EXT_framebuffer_blit_functions },
1356   { "GL_EXT_gpu_program_parameters",	GL_EXT_gpu_program_parameters_functions },
1357   { "GL_EXT_paletted_texture",		GL_EXT_paletted_texture_functions },
1358   { "GL_IBM_multimode_draw_arrays",	GL_IBM_multimode_draw_arrays_functions },
1359   { "GL_MESA_resize_buffers",		GL_MESA_resize_buffers_functions },
1360   { "GL_NV_vertex_program",		GL_NV_vertex_program_functions },
1361   { "GL_NV_fragment_program",		GL_NV_fragment_program_functions },
1362   { NULL,				NULL }
1363};
1364#endif
1365
1366/*
1367 * Create a new X/Mesa visual.
1368 * Input:  display - X11 display
1369 *         visinfo - an XVisualInfo pointer
1370 *         rgb_flag - GL_TRUE = RGB mode,
1371 *                    GL_FALSE = color index mode
1372 *         alpha_flag - alpha buffer requested?
1373 *         db_flag - GL_TRUE = double-buffered,
1374 *                   GL_FALSE = single buffered
1375 *         stereo_flag - stereo visual?
1376 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
1377 *                       GL_FALSE = use an off-screen pixmap for back buffer
1378 *         depth_size - requested bits/depth values, or zero
1379 *         stencil_size - requested bits/stencil values, or zero
1380 *         accum_red_size - requested bits/red accum values, or zero
1381 *         accum_green_size - requested bits/green accum values, or zero
1382 *         accum_blue_size - requested bits/blue accum values, or zero
1383 *         accum_alpha_size - requested bits/alpha accum values, or zero
1384 *         num_samples - number of samples/pixel if multisampling, or zero
1385 *         level - visual level, usually 0
1386 *         visualCaveat - ala the GLX extension, usually GLX_NONE
1387 * Return;  a new XMesaVisual or 0 if error.
1388 */
1389PUBLIC
1390XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1391                               XMesaVisualInfo visinfo,
1392                               GLboolean rgb_flag,
1393                               GLboolean alpha_flag,
1394                               GLboolean db_flag,
1395                               GLboolean stereo_flag,
1396                               GLboolean ximage_flag,
1397                               GLint depth_size,
1398                               GLint stencil_size,
1399                               GLint accum_red_size,
1400                               GLint accum_green_size,
1401                               GLint accum_blue_size,
1402                               GLint accum_alpha_size,
1403                               GLint num_samples,
1404                               GLint level,
1405                               GLint visualCaveat )
1406{
1407   char *gamma;
1408   XMesaVisual v;
1409   GLint red_bits, green_bits, blue_bits, alpha_bits;
1410
1411#ifdef IN_DRI_DRIVER
1412   /* driInitExtensions() should be called once per screen to setup extension
1413    * indices.  There is no need to call it when the context is created since
1414    * XMesa enables mesa sw extensions on its own.
1415    */
1416   driInitExtensions( NULL, card_extensions, GL_FALSE );
1417#endif
1418
1419#ifndef XFree86Server
1420   /* For debugging only */
1421   if (_mesa_getenv("MESA_XSYNC")) {
1422      /* This makes debugging X easier.
1423       * In your debugger, set a breakpoint on _XError to stop when an
1424       * X protocol error is generated.
1425       */
1426      XSynchronize( display, 1 );
1427   }
1428#endif
1429
1430   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1431   if (!v) {
1432      return NULL;
1433   }
1434
1435   v->display = display;
1436
1437   /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1438    * the struct but we may need some of the information contained in it
1439    * at a later time.
1440    */
1441#ifndef XFree86Server
1442   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1443   if(!v->visinfo) {
1444      _mesa_free(v);
1445      return NULL;
1446   }
1447   MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1448#endif
1449
1450   /* check for MESA_GAMMA environment variable */
1451   gamma = _mesa_getenv("MESA_GAMMA");
1452   if (gamma) {
1453      v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1454      sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1455      if (v->RedGamma<=0.0)    v->RedGamma = 1.0;
1456      if (v->GreenGamma<=0.0)  v->GreenGamma = v->RedGamma;
1457      if (v->BlueGamma<=0.0)   v->BlueGamma = v->RedGamma;
1458   }
1459   else {
1460      v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1461   }
1462
1463   v->ximage_flag = ximage_flag;
1464
1465#ifdef XFree86Server
1466   /* We could calculate these values by ourselves.  nplanes is either the sum
1467    * of the red, green, and blue bits or the number index bits.
1468    * ColormapEntries is either (1U << index_bits) or
1469    * (1U << max(redBits, greenBits, blueBits)).
1470    */
1471   assert(visinfo->nplanes > 0);
1472   v->nplanes = visinfo->nplanes;
1473   v->ColormapEntries = visinfo->ColormapEntries;
1474
1475   v->mesa_visual.redMask = visinfo->redMask;
1476   v->mesa_visual.greenMask = visinfo->greenMask;
1477   v->mesa_visual.blueMask = visinfo->blueMask;
1478   v->mesa_visual.visualID = visinfo->vid;
1479   v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1480#else
1481   v->mesa_visual.redMask = visinfo->red_mask;
1482   v->mesa_visual.greenMask = visinfo->green_mask;
1483   v->mesa_visual.blueMask = visinfo->blue_mask;
1484   v->mesa_visual.visualID = visinfo->visualid;
1485   v->mesa_visual.screen = visinfo->screen;
1486#endif
1487
1488#if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1489   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1490#else
1491   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1492#endif
1493
1494   v->mesa_visual.visualRating = visualCaveat;
1495
1496   if (alpha_flag)
1497      v->mesa_visual.alphaBits = 8;
1498
1499   (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
1500
1501   {
1502      const int xclass = v->mesa_visual.visualType;
1503      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1504         red_bits   = _mesa_bitcount(GET_REDMASK(v));
1505         green_bits = _mesa_bitcount(GET_GREENMASK(v));
1506         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
1507      }
1508      else {
1509         /* this is an approximation */
1510         int depth;
1511         depth = GET_VISUAL_DEPTH(v);
1512         red_bits = depth / 3;
1513         depth -= red_bits;
1514         green_bits = depth / 2;
1515         depth -= green_bits;
1516         blue_bits = depth;
1517         alpha_bits = 0;
1518         assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1519      }
1520      alpha_bits = v->mesa_visual.alphaBits;
1521   }
1522
1523   _mesa_initialize_visual( &v->mesa_visual,
1524                            rgb_flag, db_flag, stereo_flag,
1525                            red_bits, green_bits,
1526                            blue_bits, alpha_bits,
1527                            v->mesa_visual.indexBits,
1528                            depth_size,
1529                            stencil_size,
1530                            accum_red_size, accum_green_size,
1531                            accum_blue_size, accum_alpha_size,
1532                            0 );
1533
1534   /* XXX minor hack */
1535   v->mesa_visual.level = level;
1536   return v;
1537}
1538
1539
1540PUBLIC
1541void XMesaDestroyVisual( XMesaVisual v )
1542{
1543#ifndef XFree86Server
1544   _mesa_free(v->visinfo);
1545#endif
1546   _mesa_free(v);
1547}
1548
1549
1550
1551/**
1552 * Create a new XMesaContext.
1553 * \param v  the XMesaVisual
1554 * \param share_list  another XMesaContext with which to share display
1555 *                    lists or NULL if no sharing is wanted.
1556 * \return an XMesaContext or NULL if error.
1557 */
1558PUBLIC
1559XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1560{
1561   static GLboolean firstTime = GL_TRUE;
1562   XMesaContext c;
1563   GLcontext *mesaCtx;
1564   struct dd_function_table functions;
1565   TNLcontext *tnl;
1566
1567   if (firstTime) {
1568      _glthread_INIT_MUTEX(_xmesa_lock);
1569      firstTime = GL_FALSE;
1570   }
1571
1572   /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1573   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1574   if (!c)
1575      return NULL;
1576
1577   mesaCtx = &(c->mesa);
1578
1579   /* initialize with default driver functions, then plug in XMesa funcs */
1580   _mesa_init_driver_functions(&functions);
1581   xmesa_init_driver_functions(v, &functions);
1582   if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1583                      share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1584                      &functions, (void *) c)) {
1585      _mesa_free(c);
1586      return NULL;
1587   }
1588
1589   _mesa_enable_sw_extensions(mesaCtx);
1590   _mesa_enable_1_3_extensions(mesaCtx);
1591   _mesa_enable_1_4_extensions(mesaCtx);
1592   _mesa_enable_1_5_extensions(mesaCtx);
1593   _mesa_enable_2_0_extensions(mesaCtx);
1594   _mesa_enable_2_1_extensions(mesaCtx);
1595#if ENABLE_EXT_texure_compression_s3tc
1596    if (mesaCtx->Mesa_DXTn) {
1597       _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1598       _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1599    }
1600    _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1601#endif
1602#if ENABLE_EXT_timer_query
1603    _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1604#endif
1605
1606#ifdef XFree86Server
1607   /* If we're running in the X server, do bounds checking to prevent
1608    * segfaults and server crashes!
1609    */
1610   mesaCtx->Const.CheckArrayBounds = GL_TRUE;
1611#endif
1612
1613   /* finish up xmesa context initializations */
1614   c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1615   c->xm_visual = v;
1616   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
1617   c->display = v->display;
1618   c->pixelformat = v->dithered_pf;      /* Dithering is enabled by default */
1619
1620   /* Initialize the software rasterizer and helper modules.
1621    */
1622   if (!_swrast_CreateContext( mesaCtx ) ||
1623       !_vbo_CreateContext( mesaCtx ) ||
1624       !_tnl_CreateContext( mesaCtx ) ||
1625       !_swsetup_CreateContext( mesaCtx )) {
1626      _mesa_free_context_data(&c->mesa);
1627      _mesa_free(c);
1628      return NULL;
1629   }
1630
1631   /* tnl setup */
1632   tnl = TNL_CONTEXT(mesaCtx);
1633   tnl->Driver.RunPipeline = _tnl_run_pipeline;
1634   /* swrast setup */
1635   xmesa_register_swrast_functions( mesaCtx );
1636   _swsetup_Wakeup(mesaCtx);
1637
1638   return c;
1639}
1640
1641
1642
1643PUBLIC
1644void XMesaDestroyContext( XMesaContext c )
1645{
1646   GLcontext *mesaCtx = &c->mesa;
1647
1648#ifdef FX
1649   FXdestroyContext( XMESA_BUFFER(mesaCtx->DrawBuffer) );
1650#endif
1651
1652   _swsetup_DestroyContext( mesaCtx );
1653   _swrast_DestroyContext( mesaCtx );
1654   _tnl_DestroyContext( mesaCtx );
1655   _vbo_DestroyContext( mesaCtx );
1656   _mesa_free_context_data( mesaCtx );
1657   _mesa_free( c );
1658}
1659
1660
1661
1662/**
1663 * Private function for creating an XMesaBuffer which corresponds to an
1664 * X window or pixmap.
1665 * \param v  the window's XMesaVisual
1666 * \param w  the window we're wrapping
1667 * \return  new XMesaBuffer or NULL if error
1668 */
1669PUBLIC XMesaBuffer
1670XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1671{
1672#ifndef XFree86Server
1673   XWindowAttributes attr;
1674#endif
1675   XMesaBuffer b;
1676   XMesaColormap cmap;
1677   int depth;
1678
1679   assert(v);
1680   assert(w);
1681
1682   /* Check that window depth matches visual depth */
1683#ifdef XFree86Server
1684   depth = ((XMesaDrawable)w)->depth;
1685#else
1686   XGetWindowAttributes( v->display, w, &attr );
1687   depth = attr.depth;
1688#endif
1689   if (GET_VISUAL_DEPTH(v) != depth) {
1690      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1691                    GET_VISUAL_DEPTH(v), depth);
1692      return NULL;
1693   }
1694
1695   /* Find colormap */
1696#ifdef XFree86Server
1697   cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1698#else
1699   if (attr.colormap) {
1700      cmap = attr.colormap;
1701   }
1702   else {
1703      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1704      /* this is weird, a window w/out a colormap!? */
1705      /* OK, let's just allocate a new one and hope for the best */
1706      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1707   }
1708#endif
1709
1710   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1711   if (!b)
1712      return NULL;
1713
1714   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
1715                                      (XMesaDrawable) w, cmap )) {
1716      xmesa_free_buffer(b);
1717      return NULL;
1718   }
1719
1720   return b;
1721}
1722
1723
1724
1725/**
1726 * Create a new XMesaBuffer from an X pixmap.
1727 *
1728 * \param v    the XMesaVisual
1729 * \param p    the pixmap
1730 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1731 *             \c GLX_DIRECT_COLOR visual for the pixmap
1732 * \returns new XMesaBuffer or NULL if error
1733 */
1734PUBLIC XMesaBuffer
1735XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1736{
1737   XMesaBuffer b;
1738
1739   assert(v);
1740
1741   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1742   if (!b)
1743      return NULL;
1744
1745   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1746				     (XMesaDrawable) p, cmap)) {
1747      xmesa_free_buffer(b);
1748      return NULL;
1749   }
1750
1751   return b;
1752}
1753
1754
1755/**
1756 * For GLX_EXT_texture_from_pixmap
1757 */
1758XMesaBuffer
1759XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1760                               XMesaColormap cmap,
1761                               int format, int target, int mipmap)
1762{
1763   GET_CURRENT_CONTEXT(ctx);
1764   XMesaBuffer b;
1765   GLuint width, height;
1766
1767   assert(v);
1768
1769   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1770   if (!b)
1771      return NULL;
1772
1773   /* get pixmap size, update framebuffer/renderbuffer dims */
1774   xmesa_get_window_size(v->display, b, &width, &height);
1775   _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1776
1777   if (target == 0) {
1778      /* examine dims */
1779      if (ctx->Extensions.ARB_texture_non_power_of_two) {
1780         target = GLX_TEXTURE_2D_EXT;
1781      }
1782      else if (   _mesa_bitcount(width)  == 1
1783               && _mesa_bitcount(height) == 1) {
1784         /* power of two size */
1785         if (height == 1) {
1786            target = GLX_TEXTURE_1D_EXT;
1787         }
1788         else {
1789            target = GLX_TEXTURE_2D_EXT;
1790         }
1791      }
1792      else if (ctx->Extensions.NV_texture_rectangle) {
1793         target = GLX_TEXTURE_RECTANGLE_EXT;
1794      }
1795      else {
1796         /* non power of two textures not supported */
1797         XMesaDestroyBuffer(b);
1798         return 0;
1799      }
1800   }
1801
1802   b->TextureTarget = target;
1803   b->TextureFormat = format;
1804   b->TextureMipmap = mipmap;
1805
1806   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1807				     (XMesaDrawable) p, cmap)) {
1808      xmesa_free_buffer(b);
1809      return NULL;
1810   }
1811
1812   return b;
1813}
1814
1815
1816
1817XMesaBuffer
1818XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1819                   unsigned int width, unsigned int height)
1820{
1821#ifndef XFree86Server
1822   XMesaWindow root;
1823   XMesaDrawable drawable;  /* X Pixmap Drawable */
1824   XMesaBuffer b;
1825
1826   /* allocate pixmap for front buffer */
1827   root = RootWindow( v->display, v->visinfo->screen );
1828   drawable = XCreatePixmap(v->display, root, width, height,
1829                            v->visinfo->depth);
1830   if (!drawable)
1831      return NULL;
1832
1833   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1834   if (!b)
1835      return NULL;
1836
1837   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1838				     drawable, cmap)) {
1839      xmesa_free_buffer(b);
1840      return NULL;
1841   }
1842
1843   return b;
1844#else
1845   return 0;
1846#endif
1847}
1848
1849
1850
1851/*
1852 * Deallocate an XMesaBuffer structure and all related info.
1853 */
1854PUBLIC void
1855XMesaDestroyBuffer(XMesaBuffer b)
1856{
1857   xmesa_free_buffer(b);
1858}
1859
1860
1861/**
1862 * Query the current window size and update the corresponding GLframebuffer
1863 * and all attached renderbuffers.
1864 * Called when:
1865 *  1. the first time a buffer is bound to a context.
1866 *  2. from glViewport to poll for window size changes
1867 *  3. from the XMesaResizeBuffers() API function.
1868 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1869 * when resizing a buffer when no rendering context is bound.
1870 */
1871void
1872xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1873{
1874   GLuint width, height;
1875   xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1876   if (drawBuffer->mesa_buffer.Width != width ||
1877       drawBuffer->mesa_buffer.Height != height) {
1878      GLcontext *ctx = xmctx ? &xmctx->mesa : NULL;
1879      _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1880   }
1881   drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1882}
1883
1884
1885/*
1886 * Bind buffer b to context c and make c the current rendering context.
1887 */
1888GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1889{
1890   return XMesaMakeCurrent2( c, b, b );
1891}
1892
1893
1894/*
1895 * Bind buffer b to context c and make c the current rendering context.
1896 */
1897PUBLIC
1898GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1899                             XMesaBuffer readBuffer )
1900{
1901   if (c) {
1902      if (!drawBuffer || !readBuffer)
1903         return GL_FALSE;  /* must specify buffers! */
1904
1905      if (&(c->mesa) == _mesa_get_current_context()
1906          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1907          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1908          && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1909         /* same context and buffer, do nothing */
1910         return GL_TRUE;
1911      }
1912
1913      c->xm_buffer = drawBuffer;
1914
1915#ifdef FX
1916      if (FXmakeCurrent( drawBuffer ))
1917         return GL_TRUE;
1918#endif
1919
1920      /* Call this periodically to detect when the user has begun using
1921       * GL rendering from multiple threads.
1922       */
1923      _glapi_check_multithread();
1924
1925      xmesa_check_and_update_buffer_size(c, drawBuffer);
1926      if (readBuffer != drawBuffer)
1927         xmesa_check_and_update_buffer_size(c, readBuffer);
1928
1929      _mesa_make_current(&(c->mesa),
1930                         &drawBuffer->mesa_buffer,
1931                         &readBuffer->mesa_buffer);
1932
1933      if (c->xm_visual->mesa_visual.rgbMode) {
1934         /*
1935          * Must recompute and set these pixel values because colormap
1936          * can be different for different windows.
1937          */
1938         c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1939                                               c->clearcolor[0],
1940                                               c->clearcolor[1],
1941                                               c->clearcolor[2],
1942                                               c->clearcolor[3],
1943                                               c->xm_visual->undithered_pf);
1944         XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1945      }
1946
1947      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1948      drawBuffer->wasCurrent = GL_TRUE;
1949   }
1950   else {
1951      /* Detach */
1952      _mesa_make_current( NULL, NULL, NULL );
1953   }
1954   return GL_TRUE;
1955}
1956
1957
1958/*
1959 * Unbind the context c from its buffer.
1960 */
1961GLboolean XMesaUnbindContext( XMesaContext c )
1962{
1963   /* A no-op for XFree86 integration purposes */
1964   return GL_TRUE;
1965}
1966
1967
1968XMesaContext XMesaGetCurrentContext( void )
1969{
1970   GET_CURRENT_CONTEXT(ctx);
1971   if (ctx) {
1972      XMesaContext xmesa = XMESA_CONTEXT(ctx);
1973      return xmesa;
1974   }
1975   else {
1976      return 0;
1977   }
1978}
1979
1980
1981XMesaBuffer XMesaGetCurrentBuffer( void )
1982{
1983   GET_CURRENT_CONTEXT(ctx);
1984   if (ctx) {
1985      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1986      return xmbuf;
1987   }
1988   else {
1989      return 0;
1990   }
1991}
1992
1993
1994/* New in Mesa 3.1 */
1995XMesaBuffer XMesaGetCurrentReadBuffer( void )
1996{
1997   GET_CURRENT_CONTEXT(ctx);
1998   if (ctx) {
1999      return XMESA_BUFFER(ctx->ReadBuffer);
2000   }
2001   else {
2002      return 0;
2003   }
2004}
2005
2006
2007#ifdef XFree86Server
2008PUBLIC
2009GLboolean XMesaForceCurrent(XMesaContext c)
2010{
2011   if (c) {
2012      _glapi_set_dispatch(c->mesa.CurrentDispatch);
2013
2014      if (&(c->mesa) != _mesa_get_current_context()) {
2015	 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
2016      }
2017   }
2018   else {
2019      _mesa_make_current(NULL, NULL, NULL);
2020   }
2021   return GL_TRUE;
2022}
2023
2024
2025PUBLIC
2026GLboolean XMesaLoseCurrent(XMesaContext c)
2027{
2028   (void) c;
2029   _mesa_make_current(NULL, NULL, NULL);
2030   return GL_TRUE;
2031}
2032
2033
2034PUBLIC
2035GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
2036{
2037   _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
2038   return GL_TRUE;
2039}
2040#endif /* XFree86Server */
2041
2042
2043#ifndef FX
2044GLboolean XMesaSetFXmode( GLint mode )
2045{
2046   (void) mode;
2047   return GL_FALSE;
2048}
2049#endif
2050
2051
2052
2053/*
2054 * Copy the back buffer to the front buffer.  If there's no back buffer
2055 * this is a no-op.
2056 */
2057PUBLIC
2058void XMesaSwapBuffers( XMesaBuffer b )
2059{
2060   GET_CURRENT_CONTEXT(ctx);
2061
2062   if (!b->backxrb) {
2063      /* single buffered */
2064      return;
2065   }
2066
2067   /* If we're swapping the buffer associated with the current context
2068    * we have to flush any pending rendering commands first.
2069    */
2070   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2071      _mesa_notifySwapBuffers(ctx);
2072
2073   if (b->db_mode) {
2074#ifdef FX
2075      if (FXswapBuffers(b))
2076         return;
2077#endif
2078      if (b->backxrb->ximage) {
2079	 /* Copy Ximage (back buf) from client memory to server window */
2080#if defined(USE_XSHM) && !defined(XFree86Server)
2081	 if (b->shm) {
2082            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2083	    XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2084			  b->swapgc,
2085			  b->backxrb->ximage, 0, 0,
2086			  0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2087                          False );
2088            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2089	 }
2090	 else
2091#endif
2092         {
2093            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2094            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2095			   b->swapgc,
2096			   b->backxrb->ximage, 0, 0,
2097			   0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2098            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2099         }
2100      }
2101      else if (b->backxrb->pixmap) {
2102	 /* Copy pixmap (back buf) to window (front buf) on server */
2103         /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2104	 XMesaCopyArea( b->xm_visual->display,
2105			b->backxrb->pixmap,   /* source drawable */
2106			b->frontxrb->drawable,  /* dest. drawable */
2107			b->swapgc,
2108			0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2109			0, 0                 /* dest region */
2110		      );
2111         /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2112      }
2113
2114      if (b->swAlpha)
2115         _mesa_copy_soft_alpha_renderbuffers(ctx, &b->mesa_buffer);
2116   }
2117#if !defined(XFree86Server)
2118   XSync( b->xm_visual->display, False );
2119#endif
2120}
2121
2122
2123
2124/*
2125 * Copy sub-region of back buffer to front buffer
2126 */
2127void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2128{
2129   GET_CURRENT_CONTEXT(ctx);
2130
2131   /* If we're swapping the buffer associated with the current context
2132    * we have to flush any pending rendering commands first.
2133    */
2134   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2135      _mesa_notifySwapBuffers(ctx);
2136
2137   if (!b->backxrb) {
2138      /* single buffered */
2139      return;
2140   }
2141
2142   if (b->db_mode) {
2143      int yTop = b->mesa_buffer.Height - y - height;
2144#ifdef FX
2145      if (FXswapBuffers(b))
2146         return;
2147#endif
2148      if (b->backxrb->ximage) {
2149         /* Copy Ximage from host's memory to server's window */
2150#if defined(USE_XSHM) && !defined(XFree86Server)
2151         if (b->shm) {
2152            /* XXX assuming width and height aren't too large! */
2153            XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2154                          b->swapgc,
2155                          b->backxrb->ximage, x, yTop,
2156                          x, yTop, width, height, False );
2157            /* wait for finished event??? */
2158         }
2159         else
2160#endif
2161         {
2162            /* XXX assuming width and height aren't too large! */
2163            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2164			   b->swapgc,
2165			   b->backxrb->ximage, x, yTop,
2166			   x, yTop, width, height );
2167         }
2168      }
2169      else {
2170         /* Copy pixmap to window on server */
2171         XMesaCopyArea( b->xm_visual->display,
2172			b->backxrb->pixmap,           /* source drawable */
2173			b->frontxrb->drawable,        /* dest. drawable */
2174			b->swapgc,
2175			x, yTop, width, height,  /* source region */
2176			x, yTop                  /* dest region */
2177                      );
2178      }
2179   }
2180}
2181
2182
2183/*
2184 * Return a pointer to the XMesa backbuffer Pixmap or XImage.  This function
2185 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2186 * back buffer directly.
2187 * Output:  pixmap - pointer to back buffer's Pixmap, or 0
2188 *          ximage - pointer to back buffer's XImage, or NULL
2189 * Return:  GL_TRUE = context is double buffered
2190 *          GL_FALSE = context is single buffered
2191 */
2192#ifndef XFree86Server
2193GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2194                              XMesaPixmap *pixmap,
2195                              XMesaImage **ximage )
2196{
2197   if (b->db_mode) {
2198      if (pixmap)
2199         *pixmap = b->backxrb->pixmap;
2200      if (ximage)
2201         *ximage = b->backxrb->ximage;
2202      return GL_TRUE;
2203   }
2204   else {
2205      *pixmap = 0;
2206      *ximage = NULL;
2207      return GL_FALSE;
2208   }
2209}
2210#endif /* XFree86Server */
2211
2212
2213/*
2214 * Return the depth buffer associated with an XMesaBuffer.
2215 * Input:  b - the XMesa buffer handle
2216 * Output:  width, height - size of buffer in pixels
2217 *          bytesPerValue - bytes per depth value (2 or 4)
2218 *          buffer - pointer to depth buffer values
2219 * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
2220 */
2221GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2222                               GLint *bytesPerValue, void **buffer )
2223{
2224   struct gl_renderbuffer *rb
2225      = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2226   if (!rb || !rb->Data) {
2227      *width = 0;
2228      *height = 0;
2229      *bytesPerValue = 0;
2230      *buffer = 0;
2231      return GL_FALSE;
2232   }
2233   else {
2234      *width = b->mesa_buffer.Width;
2235      *height = b->mesa_buffer.Height;
2236      *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2237         ? sizeof(GLushort) : sizeof(GLuint);
2238      *buffer = rb->Data;
2239      return GL_TRUE;
2240   }
2241}
2242
2243
2244void XMesaFlush( XMesaContext c )
2245{
2246   if (c && c->xm_visual) {
2247#ifdef XFree86Server
2248      /* NOT_NEEDED */
2249#else
2250      XSync( c->xm_visual->display, False );
2251#endif
2252   }
2253}
2254
2255
2256
2257const char *XMesaGetString( XMesaContext c, int name )
2258{
2259   (void) c;
2260   if (name==XMESA_VERSION) {
2261      return "5.0";
2262   }
2263   else if (name==XMESA_EXTENSIONS) {
2264      return "";
2265   }
2266   else {
2267      return NULL;
2268   }
2269}
2270
2271
2272
2273XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2274{
2275   XMesaBuffer b;
2276   for (b=XMesaBufferList; b; b=b->Next) {
2277      if (b->frontxrb->drawable == d && b->display == dpy) {
2278         return b;
2279      }
2280   }
2281   return NULL;
2282}
2283
2284
2285/**
2286 * Free/destroy all XMesaBuffers associated with given display.
2287 */
2288void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2289{
2290   XMesaBuffer b, next;
2291   for (b = XMesaBufferList; b; b = next) {
2292      next = b->Next;
2293      if (b->display == dpy) {
2294         xmesa_free_buffer(b);
2295      }
2296   }
2297}
2298
2299
2300/*
2301 * Look for XMesaBuffers whose X window has been destroyed.
2302 * Deallocate any such XMesaBuffers.
2303 */
2304void XMesaGarbageCollect( void )
2305{
2306   XMesaBuffer b, next;
2307   for (b=XMesaBufferList; b; b=next) {
2308      next = b->Next;
2309      if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2310#ifdef XFree86Server
2311	 /* NOT_NEEDED */
2312#else
2313         XSync(b->display, False);
2314         if (!window_exists( b->display, b->frontxrb->drawable )) {
2315            /* found a dead window, free the ancillary info */
2316            XMesaDestroyBuffer( b );
2317         }
2318#endif
2319      }
2320   }
2321}
2322
2323
2324unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2325                                GLfloat red, GLfloat green,
2326                                GLfloat blue, GLfloat alpha )
2327{
2328   GLcontext *ctx = &xmesa->mesa;
2329   GLint r = (GLint) (red   * 255.0F);
2330   GLint g = (GLint) (green * 255.0F);
2331   GLint b = (GLint) (blue  * 255.0F);
2332   GLint a = (GLint) (alpha * 255.0F);
2333
2334   switch (xmesa->pixelformat) {
2335      case PF_Index:
2336         return 0;
2337      case PF_Truecolor:
2338         {
2339            unsigned long p;
2340            PACK_TRUECOLOR( p, r, g, b );
2341            return p;
2342         }
2343      case PF_8A8B8G8R:
2344         return PACK_8A8B8G8R( r, g, b, a );
2345      case PF_8A8R8G8B:
2346         return PACK_8A8R8G8B( r, g, b, a );
2347      case PF_8R8G8B:
2348         return PACK_8R8G8B( r, g, b );
2349      case PF_5R6G5B:
2350         return PACK_5R6G5B( r, g, b );
2351      case PF_Dither:
2352         {
2353            DITHER_SETUP;
2354            return DITHER( x, y, r, g, b );
2355         }
2356      case PF_1Bit:
2357         /* 382 = (3*255)/2 */
2358         return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2359      case PF_HPCR:
2360         return DITHER_HPCR(x, y, r, g, b);
2361      case PF_Lookup:
2362         {
2363            LOOKUP_SETUP;
2364            return LOOKUP( r, g, b );
2365         }
2366      case PF_Grayscale:
2367         return GRAY_RGB( r, g, b );
2368      case PF_Dither_5R6G5B:
2369         /* fall through */
2370      case PF_Dither_True:
2371         {
2372            unsigned long p;
2373            PACK_TRUEDITHER(p, x, y, r, g, b);
2374            return p;
2375         }
2376      default:
2377         _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2378   }
2379   return 0;
2380}
2381
2382
2383/*
2384 * This is typically called when the window size changes and we need
2385 * to reallocate the buffer's back/depth/stencil/accum buffers.
2386 */
2387PUBLIC void
2388XMesaResizeBuffers( XMesaBuffer b )
2389{
2390   GET_CURRENT_CONTEXT(ctx);
2391   XMesaContext xmctx = XMESA_CONTEXT(ctx);
2392   if (!xmctx)
2393      return;
2394   xmesa_check_and_update_buffer_size(xmctx, b);
2395}
2396
2397
2398static GLint
2399xbuffer_to_renderbuffer(int buffer)
2400{
2401   assert(MAX_AUX_BUFFERS <= 4);
2402
2403   switch (buffer) {
2404   case GLX_FRONT_LEFT_EXT:
2405      return BUFFER_FRONT_LEFT;
2406   case GLX_FRONT_RIGHT_EXT:
2407      return BUFFER_FRONT_RIGHT;
2408   case GLX_BACK_LEFT_EXT:
2409      return BUFFER_BACK_LEFT;
2410   case GLX_BACK_RIGHT_EXT:
2411      return BUFFER_BACK_RIGHT;
2412   case GLX_AUX0_EXT:
2413      return BUFFER_AUX0;
2414   case GLX_AUX1_EXT:
2415      return BUFFER_AUX1;
2416   case GLX_AUX2_EXT:
2417      return BUFFER_AUX2;
2418   case GLX_AUX3_EXT:
2419      return BUFFER_AUX3;
2420   case GLX_AUX4_EXT:
2421   case GLX_AUX5_EXT:
2422   case GLX_AUX6_EXT:
2423   case GLX_AUX7_EXT:
2424   case GLX_AUX8_EXT:
2425   case GLX_AUX9_EXT:
2426   default:
2427      /* BadValue error */
2428      return -1;
2429   }
2430}
2431
2432
2433PUBLIC void
2434XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
2435                  const int *attrib_list)
2436{
2437#if 0
2438   GET_CURRENT_CONTEXT(ctx);
2439   const GLuint unit = ctx->Texture.CurrentUnit;
2440   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
2441   struct gl_texture_object *texObj;
2442#endif
2443   struct gl_renderbuffer *rb;
2444   struct xmesa_renderbuffer *xrb;
2445   GLint b;
2446   XMesaImage *img = NULL;
2447   GLboolean freeImg = GL_FALSE;
2448
2449   b = xbuffer_to_renderbuffer(buffer);
2450   if (b < 0)
2451      return;
2452
2453   if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
2454      return; /* BadMatch error */
2455
2456   rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
2457   if (!rb) {
2458      /* invalid buffer */
2459      return;
2460   }
2461   xrb = xmesa_renderbuffer(rb);
2462
2463#if 0
2464   switch (drawable->TextureTarget) {
2465   case GLX_TEXTURE_1D_EXT:
2466      texObj = texUnit->Current1D;
2467      break;
2468   case GLX_TEXTURE_2D_EXT:
2469      texObj = texUnit->Current2D;
2470      break;
2471   case GLX_TEXTURE_RECTANGLE_EXT:
2472      texObj = texUnit->CurrentRect;
2473      break;
2474   default:
2475      return; /* BadMatch error */
2476   }
2477#endif
2478
2479   /*
2480    * The following is a quick and simple way to implement
2481    * BindTexImage.  The better way is to write some new FetchTexel()
2482    * functions which would extract texels from XImages.  We'd still
2483    * need to use GetImage when texturing from a Pixmap (front buffer)
2484    * but texturing from a back buffer (XImage) would avoid an image
2485    * copy.
2486    */
2487
2488   /* get XImage */
2489   if (xrb->pixmap) {
2490      img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
2491			  ZPixmap);
2492      freeImg = GL_TRUE;
2493   }
2494   else if (xrb->ximage) {
2495      img = xrb->ximage;
2496   }
2497
2498   /* store the XImage as a new texture image */
2499   if (img) {
2500      GLenum format, type, intFormat;
2501      if (img->bits_per_pixel == 32) {
2502         format = GL_BGRA;
2503         type = GL_UNSIGNED_BYTE;
2504         intFormat = GL_RGBA;
2505      }
2506      else if (img->bits_per_pixel == 24) {
2507         format = GL_BGR;
2508         type = GL_UNSIGNED_BYTE;
2509         intFormat = GL_RGB;
2510      }
2511      else if (img->bits_per_pixel == 16) {
2512         format = GL_BGR;
2513         type = GL_UNSIGNED_SHORT_5_6_5;
2514         intFormat = GL_RGB;
2515      }
2516      else {
2517         _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
2518         return;
2519      }
2520      if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
2521         intFormat = GL_RGBA;
2522      }
2523      else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
2524         intFormat = GL_RGB;
2525      }
2526
2527      _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
2528                       format, type, img->data);
2529
2530      if (freeImg) {
2531	 XMesaDestroyImage(img);
2532      }
2533   }
2534}
2535
2536
2537
2538PUBLIC void
2539XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
2540{
2541   const GLint b = xbuffer_to_renderbuffer(buffer);
2542   if (b < 0)
2543      return;
2544
2545   /* no-op for now */
2546}
2547
2548