xm_api.c revision da9d8f192431b0142e65bceb5ca8a2e52e21ac90 
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#include "drivers/common/meta.h"
83
84/**
85 * Global X driver lock
86 */
87_glthread_Mutex _xmesa_lock;
88
89
90
91/**
92 * Lookup tables for HPCR pixel format:
93 */
94static short hpcr_rgbTbl[3][256] = {
95{
96 16,  16,  17,  17,  18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  23,
97 24,  24,  25,  25,  26,  26,  27,  27,  28,  28,  29,  29,  30,  30,  31,  31,
98 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
99 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
100 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
101 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
102 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
103 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
104112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
105128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
106144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
107160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
108176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
109192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
110208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
111224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
112},
113{
114 16,  16,  17,  17,  18,  18,  19,  19,  20,  20,  21,  21,  22,  22,  23,  23,
115 24,  24,  25,  25,  26,  26,  27,  27,  28,  28,  29,  29,  30,  30,  31,  31,
116 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
117 32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,
118 48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
119 64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,  77,  78,  79,
120 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
121 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
122112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
123128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
124144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
125160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
126176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
127192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
128208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
129224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
130},
131{
132 32,  32,  33,  33,  34,  34,  35,  35,  36,  36,  37,  37,  38,  38,  39,  39,
133 40,  40,  41,  41,  42,  42,  43,  43,  44,  44,  45,  45,  46,  46,  47,  47,
134 48,  48,  49,  49,  50,  50,  51,  51,  52,  52,  53,  53,  54,  54,  55,  55,
135 56,  56,  57,  57,  58,  58,  59,  59,  60,  60,  61,  61,  62,  62,  63,  63,
136 64,  64,  65,  65,  66,  66,  67,  67,  68,  68,  69,  69,  70,  70,  71,  71,
137 72,  72,  73,  73,  74,  74,  75,  75,  76,  76,  77,  77,  78,  78,  79,  79,
138 80,  80,  81,  81,  82,  82,  83,  83,  84,  84,  85,  85,  86,  86,  87,  87,
139 80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
140 96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
141112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
142128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
143144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
144160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
145176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
146192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
147208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
148}
149};
150
151
152
153/**********************************************************************/
154/*****                     X Utility Functions                    *****/
155/**********************************************************************/
156
157
158/**
159 * Return the host's byte order as LSBFirst or MSBFirst ala X.
160 */
161#ifndef XFree86Server
162static int host_byte_order( void )
163{
164   int i = 1;
165   char *cptr = (char *) &i;
166   return (*cptr==1) ? LSBFirst : MSBFirst;
167}
168#endif
169
170
171/**
172 * Check if the X Shared Memory extension is available.
173 * Return:  0 = not available
174 *          1 = shared XImage support available
175 *          2 = shared Pixmap support available also
176 */
177static int check_for_xshm( XMesaDisplay *display )
178{
179#if defined(USE_XSHM) && !defined(XFree86Server)
180   int major, minor, ignore;
181   Bool pixmaps;
182
183   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
184      if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
185	 return (pixmaps==True) ? 2 : 1;
186      }
187      else {
188	 return 0;
189      }
190   }
191   else {
192      return 0;
193   }
194#else
195   /* No  XSHM support */
196   return 0;
197#endif
198}
199
200
201/**
202 * Apply gamma correction to an intensity value in [0..max].  Return the
203 * new intensity value.
204 */
205static GLint
206gamma_adjust( GLfloat gamma, GLint value, GLint max )
207{
208   if (gamma == 1.0) {
209      return value;
210   }
211   else {
212      double x = (double) value / (double) max;
213      return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
214   }
215}
216
217
218
219/**
220 * Return the true number of bits per pixel for XImages.
221 * For example, if we request a 24-bit deep visual we may actually need/get
222 * 32bpp XImages.  This function returns the appropriate bpp.
223 * Input:  dpy - the X display
224 *         visinfo - desribes the visual to be used for XImages
225 * Return:  true number of bits per pixel for XImages
226 */
227static int
228bits_per_pixel( XMesaVisual xmv )
229{
230#ifdef XFree86Server
231   const int depth = xmv->nplanes;
232   int i;
233   assert(depth > 0);
234   for (i = 0; i < screenInfo.numPixmapFormats; i++) {
235      if (screenInfo.formats[i].depth == depth)
236         return screenInfo.formats[i].bitsPerPixel;
237   }
238   return depth;  /* should never get here, but this should be safe */
239#else
240   XMesaDisplay *dpy = xmv->display;
241   XMesaVisualInfo visinfo = xmv->visinfo;
242   XMesaImage *img;
243   int bitsPerPixel;
244   /* Create a temporary XImage */
245   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
246		       ZPixmap, 0,           /*format, offset*/
247		       (char*) MALLOC(8),    /*data*/
248		       1, 1,                 /*width, height*/
249		       32,                   /*bitmap_pad*/
250		       0                     /*bytes_per_line*/
251                     );
252   assert(img);
253   /* grab the bits/pixel value */
254   bitsPerPixel = img->bits_per_pixel;
255   /* free the XImage */
256   _mesa_free( img->data );
257   img->data = NULL;
258   XMesaDestroyImage( img );
259   return bitsPerPixel;
260#endif
261}
262
263
264
265/*
266 * Determine if a given X window ID is valid (window exists).
267 * Do this by calling XGetWindowAttributes() for the window and
268 * checking if we catch an X error.
269 * Input:  dpy - the display
270 *         win - the window to check for existance
271 * Return:  GL_TRUE - window exists
272 *          GL_FALSE - window doesn't exist
273 */
274#ifndef XFree86Server
275static GLboolean WindowExistsFlag;
276
277static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
278{
279   (void) dpy;
280   if (xerr->error_code == BadWindow) {
281      WindowExistsFlag = GL_FALSE;
282   }
283   return 0;
284}
285
286static GLboolean window_exists( XMesaDisplay *dpy, Window win )
287{
288   XWindowAttributes wa;
289   int (*old_handler)( XMesaDisplay*, XErrorEvent* );
290   WindowExistsFlag = GL_TRUE;
291   old_handler = XSetErrorHandler(window_exists_err_handler);
292   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
293   XSetErrorHandler(old_handler);
294   return WindowExistsFlag;
295}
296
297static Status
298get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
299{
300   Window root;
301   Status stat;
302   int xpos, ypos;
303   unsigned int w, h, bw, depth;
304   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
305   *width = w;
306   *height = h;
307   return stat;
308}
309#endif
310
311
312/**
313 * Return the size of the window (or pixmap) that corresponds to the
314 * given XMesaBuffer.
315 * \param width  returns width in pixels
316 * \param height  returns height in pixels
317 */
318void
319xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
320                      GLuint *width, GLuint *height)
321{
322#ifdef XFree86Server
323   *width = MIN2(b->frontxrb->drawable->width, MAX_WIDTH);
324   *height = MIN2(b->frontxrb->drawable->height, MAX_HEIGHT);
325#else
326   Status stat;
327
328   _glthread_LOCK_MUTEX(_xmesa_lock);
329   XSync(b->xm_visual->display, 0); /* added for Chromium */
330   stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
331   _glthread_UNLOCK_MUTEX(_xmesa_lock);
332
333   if (!stat) {
334      /* probably querying a window that's recently been destroyed */
335      _mesa_warning(NULL, "XGetGeometry failed!\n");
336      *width = *height = 1;
337   }
338#endif
339}
340
341
342
343/**********************************************************************/
344/*****                Linked list of XMesaBuffers                 *****/
345/**********************************************************************/
346
347XMesaBuffer XMesaBufferList = NULL;
348
349
350/**
351 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
352 * Note that XMesaBuffer is derived from GLframebuffer.
353 * The new XMesaBuffer will not have any size (Width=Height=0).
354 *
355 * \param d  the corresponding X drawable (window or pixmap)
356 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
357 * \param vis  the buffer's visual
358 * \param cmap  the window's colormap, if known.
359 * \return new XMesaBuffer or NULL if any problem
360 */
361static XMesaBuffer
362create_xmesa_buffer(XMesaDrawable d, BufferType type,
363                    XMesaVisual vis, XMesaColormap cmap)
364{
365   XMesaBuffer b;
366
367   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
368
369   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
370   if (!b)
371      return NULL;
372
373   b->display = vis->display;
374   b->xm_visual = vis;
375   b->type = type;
376   b->cmap = cmap;
377
378   _mesa_initialize_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
379   b->mesa_buffer.Delete = xmesa_delete_framebuffer;
380
381   /*
382    * Front renderbuffer
383    */
384   b->frontxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_FALSE);
385   if (!b->frontxrb) {
386      _mesa_free(b);
387      return NULL;
388   }
389   b->frontxrb->Parent = b;
390   b->frontxrb->drawable = d;
391   b->frontxrb->pixmap = (XMesaPixmap) d;
392   _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
393                          &b->frontxrb->Base);
394
395   /*
396    * Back renderbuffer
397    */
398   if (vis->mesa_visual.doubleBufferMode) {
399      b->backxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_TRUE);
400      if (!b->backxrb) {
401         /* XXX free front xrb too */
402         _mesa_free(b);
403         return NULL;
404      }
405      b->backxrb->Parent = b;
406      /* determine back buffer implementation */
407      b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
408
409      _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
410                             &b->backxrb->Base);
411   }
412
413   /*
414    * Software alpha planes
415    */
416   if (vis->mesa_visual.alphaBits > 0
417       && vis->undithered_pf != PF_8A8B8G8R
418       && vis->undithered_pf != PF_8A8R8G8B) {
419      /* Visual has alpha, but pixel format doesn't support it.
420       * We'll use an alpha renderbuffer wrapper.
421       */
422      b->swAlpha = GL_TRUE;
423   }
424   else {
425      b->swAlpha = GL_FALSE;
426   }
427
428   /*
429    * Other renderbuffer (depth, stencil, etc)
430    */
431   _mesa_add_soft_renderbuffers(&b->mesa_buffer,
432                                GL_FALSE,  /* color */
433                                vis->mesa_visual.haveDepthBuffer,
434                                vis->mesa_visual.haveStencilBuffer,
435                                vis->mesa_visual.haveAccumBuffer,
436                                b->swAlpha,
437                                vis->mesa_visual.numAuxBuffers > 0 );
438
439   /* GLX_EXT_texture_from_pixmap */
440   b->TextureTarget = 0;
441   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
442   b->TextureMipmap = 0;
443
444   /* insert buffer into linked list */
445   b->Next = XMesaBufferList;
446   XMesaBufferList = b;
447
448   return b;
449}
450
451
452/**
453 * Find an XMesaBuffer by matching X display and colormap but NOT matching
454 * the notThis buffer.
455 */
456XMesaBuffer
457xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
458{
459   XMesaBuffer b;
460   for (b=XMesaBufferList; b; b=b->Next) {
461      if (b->display==dpy && b->cmap==cmap && b!=notThis) {
462         return b;
463      }
464   }
465   return NULL;
466}
467
468
469/**
470 * Remove buffer from linked list, delete if no longer referenced.
471 */
472static void
473xmesa_free_buffer(XMesaBuffer buffer)
474{
475   XMesaBuffer prev = NULL, b;
476
477   for (b = XMesaBufferList; b; b = b->Next) {
478      if (b == buffer) {
479         struct gl_framebuffer *fb = &buffer->mesa_buffer;
480
481         /* unlink buffer from list */
482         if (prev)
483            prev->Next = buffer->Next;
484         else
485            XMesaBufferList = buffer->Next;
486
487         /* mark as delete pending */
488         fb->DeletePending = GL_TRUE;
489
490         /* Since the X window for the XMesaBuffer is going away, we don't
491          * want to dereference this pointer in the future.
492          */
493         b->frontxrb->drawable = 0;
494
495         /* Unreference.  If count = zero we'll really delete the buffer */
496         _mesa_reference_framebuffer(&fb, NULL);
497
498         return;
499      }
500      /* continue search */
501      prev = b;
502   }
503   /* buffer not found in XMesaBufferList */
504   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
505}
506
507
508/**
509 * Copy X color table stuff from one XMesaBuffer to another.
510 */
511static void
512copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
513{
514   MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
515   MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
516   MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
517   MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
518   dst->num_alloced = src->num_alloced;
519   MEMCPY(dst->alloced_colors, src->alloced_colors,
520          sizeof(src->alloced_colors));
521}
522
523
524
525/**********************************************************************/
526/*****                   Misc Private Functions                   *****/
527/**********************************************************************/
528
529
530/**
531 * A replacement for XAllocColor.  This function should never
532 * fail to allocate a color.  When XAllocColor fails, we return
533 * the nearest matching color.  If we have to allocate many colors
534 * this function isn't too efficient; the XQueryColors() could be
535 * done just once.
536 * Written by Michael Pichler, Brian Paul, Mark Kilgard
537 * Input:  dpy - X display
538 *         cmap - X colormap
539 *         cmapSize - size of colormap
540 * In/Out: color - the XColor struct
541 * Output:  exact - 1=exact color match, 0=closest match
542 *          alloced - 1=XAlloc worked, 0=XAlloc failed
543 */
544static void
545noFaultXAllocColor( int client,
546                    XMesaDisplay *dpy,
547                    XMesaColormap cmap,
548                    int cmapSize,
549                    XMesaColor *color,
550                    int *exact, int *alloced )
551{
552#ifdef XFree86Server
553   Pixel *ppixIn;
554   xrgb *ctable;
555#else
556   /* we'll try to cache ctable for better remote display performance */
557   static Display *prevDisplay = NULL;
558   static XMesaColormap prevCmap = 0;
559   static int prevCmapSize = 0;
560   static XMesaColor *ctable = NULL;
561#endif
562   XMesaColor subColor;
563   int i, bestmatch;
564   double mindist;       /* 3*2^16^2 exceeds long int precision. */
565
566   (void) client;
567
568   /* First try just using XAllocColor. */
569#ifdef XFree86Server
570   if (AllocColor(cmap,
571		  &color->red, &color->green, &color->blue,
572		  &color->pixel,
573		  client) == Success)
574#else
575   if (XAllocColor(dpy, cmap, color))
576#endif
577   {
578      *exact = 1;
579      *alloced = 1;
580      return;
581   }
582
583   /* Alloc failed, search for closest match */
584
585   /* Retrieve color table entries. */
586   /* XXX alloca candidate. */
587#ifdef XFree86Server
588   ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
589   ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
590   for (i = 0; i < cmapSize; i++) {
591      ppixIn[i] = i;
592   }
593   QueryColors(cmap, cmapSize, ppixIn, ctable);
594#else
595   if (prevDisplay != dpy || prevCmap != cmap
596       || prevCmapSize != cmapSize || !ctable) {
597      /* free previously cached color table */
598      if (ctable)
599         _mesa_free(ctable);
600      /* Get the color table from X */
601      ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
602      assert(ctable);
603      for (i = 0; i < cmapSize; i++) {
604         ctable[i].pixel = i;
605      }
606      XQueryColors(dpy, cmap, ctable, cmapSize);
607      prevDisplay = dpy;
608      prevCmap = cmap;
609      prevCmapSize = cmapSize;
610   }
611#endif
612
613   /* Find best match. */
614   bestmatch = -1;
615   mindist = 0.0;
616   for (i = 0; i < cmapSize; i++) {
617      double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
618      double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
619      double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
620      double dist = dr * dr + dg * dg + db * db;
621      if (bestmatch < 0 || dist < mindist) {
622         bestmatch = i;
623         mindist = dist;
624      }
625   }
626
627   /* Return result. */
628   subColor.red   = ctable[bestmatch].red;
629   subColor.green = ctable[bestmatch].green;
630   subColor.blue  = ctable[bestmatch].blue;
631   /* Try to allocate the closest match color.  This should only
632    * fail if the cell is read/write.  Otherwise, we're incrementing
633    * the cell's reference count.
634    */
635#ifdef XFree86Server
636   if (AllocColor(cmap,
637		  &subColor.red, &subColor.green, &subColor.blue,
638		  &subColor.pixel,
639		  client) == Success) {
640#else
641   if (XAllocColor(dpy, cmap, &subColor)) {
642#endif
643      *alloced = 1;
644   }
645   else {
646      /* do this to work around a problem reported by Frank Ortega */
647      subColor.pixel = (unsigned long) bestmatch;
648      subColor.red   = ctable[bestmatch].red;
649      subColor.green = ctable[bestmatch].green;
650      subColor.blue  = ctable[bestmatch].blue;
651      subColor.flags = DoRed | DoGreen | DoBlue;
652      *alloced = 0;
653   }
654#ifdef XFree86Server
655   _mesa_free(ppixIn);
656   _mesa_free(ctable);
657#else
658   /* don't free table, save it for next time */
659#endif
660
661   *color = subColor;
662   *exact = 0;
663}
664
665
666
667/**
668 * Do setup for PF_GRAYSCALE pixel format.
669 * Note that buffer may be NULL.
670 */
671static GLboolean
672setup_grayscale(int client, XMesaVisual v,
673                XMesaBuffer buffer, XMesaColormap cmap)
674{
675   if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
676      return GL_FALSE;
677   }
678
679   if (buffer) {
680      XMesaBuffer prevBuffer;
681
682      if (!cmap) {
683         return GL_FALSE;
684      }
685
686      prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
687      if (prevBuffer &&
688          (buffer->xm_visual->mesa_visual.rgbMode ==
689           prevBuffer->xm_visual->mesa_visual.rgbMode)) {
690         /* Copy colormap stuff from previous XMesaBuffer which uses same
691          * X colormap.  Do this to avoid time spent in noFaultXAllocColor.
692          */
693         copy_colortable_info(buffer, prevBuffer);
694      }
695      else {
696         /* Allocate 256 shades of gray */
697         int gray;
698         int colorsfailed = 0;
699         for (gray=0;gray<256;gray++) {
700            GLint r = gamma_adjust( v->RedGamma,   gray, 255 );
701            GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
702            GLint b = gamma_adjust( v->BlueGamma,  gray, 255 );
703            int exact, alloced;
704            XMesaColor xcol;
705            xcol.red   = (r << 8) | r;
706            xcol.green = (g << 8) | g;
707            xcol.blue  = (b << 8) | b;
708            noFaultXAllocColor( client, v->display,
709                                cmap, GET_COLORMAP_SIZE(v),
710                                &xcol, &exact, &alloced );
711            if (!exact) {
712               colorsfailed++;
713            }
714            if (alloced) {
715               assert(buffer->num_alloced<256);
716               buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
717               buffer->num_alloced++;
718            }
719
720            /*OLD
721            assert(gray < 576);
722            buffer->color_table[gray*3+0] = xcol.pixel;
723            buffer->color_table[gray*3+1] = xcol.pixel;
724            buffer->color_table[gray*3+2] = xcol.pixel;
725            assert(xcol.pixel < 65536);
726            buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
727            buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
728            buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
729            */
730            buffer->color_table[gray] = xcol.pixel;
731            assert(xcol.pixel < 65536);
732            buffer->pixel_to_r[xcol.pixel] = gray;
733            buffer->pixel_to_g[xcol.pixel] = gray;
734            buffer->pixel_to_b[xcol.pixel] = gray;
735         }
736
737         if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
738            _mesa_warning(NULL,
739                  "Note: %d out of 256 needed colors do not match exactly.\n",
740                  colorsfailed );
741         }
742      }
743   }
744
745   v->dithered_pf = PF_Grayscale;
746   v->undithered_pf = PF_Grayscale;
747   return GL_TRUE;
748}
749
750
751
752/**
753 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
754 * or 8-bit TrueColor visual visual.  We try to allocate a palette of 225
755 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
756 * color.  While this function was originally designed just for 8-bit
757 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
758 * Dithering code contributed by Bob Mercier.
759 */
760static GLboolean
761setup_dithered_color(int client, XMesaVisual v,
762                     XMesaBuffer buffer, XMesaColormap cmap)
763{
764   if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
765      return GL_FALSE;
766   }
767
768   if (buffer) {
769      XMesaBuffer prevBuffer;
770
771      if (!cmap) {
772         return GL_FALSE;
773      }
774
775      prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
776      if (prevBuffer &&
777          (buffer->xm_visual->mesa_visual.rgbMode ==
778           prevBuffer->xm_visual->mesa_visual.rgbMode)) {
779         /* Copy colormap stuff from previous, matching XMesaBuffer.
780          * Do this to avoid time spent in noFaultXAllocColor.
781          */
782         copy_colortable_info(buffer, prevBuffer);
783      }
784      else {
785         /* Allocate X colors and initialize color_table[], red_table[], etc */
786         int r, g, b, i;
787         int colorsfailed = 0;
788         for (r = 0; r < DITH_R; r++) {
789            for (g = 0; g < DITH_G; g++) {
790               for (b = 0; b < DITH_B; b++) {
791                  XMesaColor xcol;
792                  int exact, alloced;
793                  xcol.red  =gamma_adjust(v->RedGamma,   r*65535/(DITH_R-1),65535);
794                  xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
795                  xcol.blue =gamma_adjust(v->BlueGamma,  b*65535/(DITH_B-1),65535);
796                  noFaultXAllocColor( client, v->display,
797                                      cmap, GET_COLORMAP_SIZE(v),
798                                      &xcol, &exact, &alloced );
799                  if (!exact) {
800                     colorsfailed++;
801                  }
802                  if (alloced) {
803                     assert(buffer->num_alloced<256);
804                     buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
805                     buffer->num_alloced++;
806                  }
807                  i = DITH_MIX( r, g, b );
808                  assert(i < 576);
809                  buffer->color_table[i] = xcol.pixel;
810                  assert(xcol.pixel < 65536);
811                  buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
812                  buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
813                  buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
814               }
815            }
816         }
817
818         if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
819            _mesa_warning(NULL,
820                  "Note: %d out of %d needed colors do not match exactly.\n",
821                  colorsfailed, DITH_R * DITH_G * DITH_B );
822         }
823      }
824   }
825
826   v->dithered_pf = PF_Dither;
827   v->undithered_pf = PF_Lookup;
828   return GL_TRUE;
829}
830
831
832/**
833 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
834 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
835 * Special dithering tables have to be initialized.
836 */
837static void
838setup_8bit_hpcr(XMesaVisual v)
839{
840   /* HP Color Recovery contributed by:  Alex De Bruyn (ad@lms.be)
841    * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
842    * on the root window AND the colormap obtainable by XGetRGBColormaps
843    * for that atom must be set on the window.  (see also tkInitWindow)
844    * If that colormap is not set, the output will look stripy.
845    */
846
847   /* Setup color tables with gamma correction */
848   int i;
849   double g;
850
851   g = 1.0 / v->RedGamma;
852   for (i=0; i<256; i++) {
853      GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
854      v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
855   }
856
857   g = 1.0 / v->GreenGamma;
858   for (i=0; i<256; i++) {
859      GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
860      v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
861   }
862
863   g = 1.0 / v->BlueGamma;
864   for (i=0; i<256; i++) {
865      GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
866      v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
867   }
868   v->undithered_pf = PF_HPCR;  /* can't really disable dithering for now */
869   v->dithered_pf = PF_HPCR;
870
871   /* which method should I use to clear */
872   /* GL_FALSE: keep the ordinary method  */
873   /* GL_TRUE : clear with dither pattern */
874   v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
875
876   if (v->hpcr_clear_flag) {
877      v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
878                                               DefaultRootWindow(v->display),
879                                               16, 2, 8);
880#ifndef XFree86Server
881      v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
882                                       0, 0, 16, 2, AllPlanes, ZPixmap);
883#endif
884   }
885}
886
887
888/**
889 * Setup RGB rendering for a window with a True/DirectColor visual.
890 */
891static void
892setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
893{
894   unsigned long rmask, gmask, bmask;
895   (void) buffer;
896   (void) cmap;
897
898   /* Compute red multiplier (mask) and bit shift */
899   v->rshift = 0;
900   rmask = GET_REDMASK(v);
901   while ((rmask & 1)==0) {
902      v->rshift++;
903      rmask = rmask >> 1;
904   }
905
906   /* Compute green multiplier (mask) and bit shift */
907   v->gshift = 0;
908   gmask = GET_GREENMASK(v);
909   while ((gmask & 1)==0) {
910      v->gshift++;
911      gmask = gmask >> 1;
912   }
913
914   /* Compute blue multiplier (mask) and bit shift */
915   v->bshift = 0;
916   bmask = GET_BLUEMASK(v);
917   while ((bmask & 1)==0) {
918      v->bshift++;
919      bmask = bmask >> 1;
920   }
921
922   /*
923    * Compute component-to-pixel lookup tables and dithering kernel
924    */
925   {
926      static GLubyte kernel[16] = {
927          0*16,  8*16,  2*16, 10*16,
928         12*16,  4*16, 14*16,  6*16,
929          3*16, 11*16,  1*16,  9*16,
930         15*16,  7*16, 13*16,  5*16,
931      };
932      GLint rBits = _mesa_bitcount(rmask);
933      GLint gBits = _mesa_bitcount(gmask);
934      GLint bBits = _mesa_bitcount(bmask);
935      GLint maxBits;
936      GLuint i;
937
938      /* convert pixel components in [0,_mask] to RGB values in [0,255] */
939      for (i=0; i<=rmask; i++)
940         v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
941      for (i=0; i<=gmask; i++)
942         v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
943      for (i=0; i<=bmask; i++)
944         v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
945
946      /* convert RGB values from [0,255] to pixel components */
947
948      for (i=0;i<256;i++) {
949         GLint r = gamma_adjust(v->RedGamma,   i, 255);
950         GLint g = gamma_adjust(v->GreenGamma, i, 255);
951         GLint b = gamma_adjust(v->BlueGamma,  i, 255);
952         v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
953         v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
954         v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
955      }
956      /* overflow protection */
957      for (i=256;i<512;i++) {
958         v->RtoPixel[i] = v->RtoPixel[255];
959         v->GtoPixel[i] = v->GtoPixel[255];
960         v->BtoPixel[i] = v->BtoPixel[255];
961      }
962
963      /* setup dithering kernel */
964      maxBits = rBits;
965      if (gBits > maxBits)  maxBits = gBits;
966      if (bBits > maxBits)  maxBits = bBits;
967      for (i=0;i<16;i++) {
968         v->Kernel[i] = kernel[i] >> maxBits;
969      }
970
971      v->undithered_pf = PF_Truecolor;
972      v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
973   }
974
975   /*
976    * Now check for TrueColor visuals which we can optimize.
977    */
978   if (   GET_REDMASK(v)  ==0x0000ff
979       && GET_GREENMASK(v)==0x00ff00
980       && GET_BLUEMASK(v) ==0xff0000
981       && CHECK_BYTE_ORDER(v)
982       && v->BitsPerPixel==32
983       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
984      /* common 32 bpp config used on SGI, Sun */
985      v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
986   }
987   else if (GET_REDMASK(v)  == 0xff0000
988         && GET_GREENMASK(v)== 0x00ff00
989         && GET_BLUEMASK(v) == 0x0000ff
990         && CHECK_BYTE_ORDER(v)
991         && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
992      if (v->BitsPerPixel==32) {
993         /* if 32 bpp, and visual indicates 8 bpp alpha channel */
994         if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
995            v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
996         else
997            v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
998      }
999      else if (v->BitsPerPixel == 24) {
1000         v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
1001      }
1002   }
1003   else if (GET_REDMASK(v)  ==0xf800
1004       &&   GET_GREENMASK(v)==0x07e0
1005       &&   GET_BLUEMASK(v) ==0x001f
1006       && CHECK_BYTE_ORDER(v)
1007       && v->BitsPerPixel==16
1008       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1009      /* 5-6-5 RGB */
1010      v->undithered_pf = PF_5R6G5B;
1011      v->dithered_pf = PF_Dither_5R6G5B;
1012   }
1013   else if (GET_REDMASK(v)  ==0xe0
1014       &&   GET_GREENMASK(v)==0x1c
1015       &&   GET_BLUEMASK(v) ==0x03
1016       && CHECK_FOR_HPCR(v)) {
1017      /* 8-bit HP color recovery */
1018      setup_8bit_hpcr( v );
1019   }
1020}
1021
1022
1023
1024/**
1025 * Setup RGB rendering for a window with a monochrome visual.
1026 */
1027static void
1028setup_monochrome( XMesaVisual v, XMesaBuffer b )
1029{
1030   (void) b;
1031   v->dithered_pf = v->undithered_pf = PF_1Bit;
1032   /* if black=1 then we must flip pixel values */
1033   v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1034}
1035
1036
1037
1038/**
1039 * When a context is bound for the first time, we can finally finish
1040 * initializing the context's visual and buffer information.
1041 * \param v  the XMesaVisual to initialize
1042 * \param b  the XMesaBuffer to initialize (may be NULL)
1043 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
1044 * \param window  the window/pixmap we're rendering into
1045 * \param cmap  the colormap associated with the window/pixmap
1046 * \return GL_TRUE=success, GL_FALSE=failure
1047 */
1048static GLboolean
1049initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
1050                             GLboolean rgb_flag, XMesaDrawable window,
1051                             XMesaColormap cmap)
1052{
1053   int client = 0;
1054
1055#ifdef XFree86Server
1056   client = (window) ? CLIENT_ID(window->id) : 0;
1057#endif
1058
1059   ASSERT(!b || b->xm_visual == v);
1060
1061   /* Save true bits/pixel */
1062   v->BitsPerPixel = bits_per_pixel(v);
1063   assert(v->BitsPerPixel > 0);
1064
1065   if (rgb_flag == GL_FALSE) {
1066      /* COLOR-INDEXED WINDOW:
1067       * Even if the visual is TrueColor or DirectColor we treat it as
1068       * being color indexed.  This is weird but might be useful to someone.
1069       */
1070      v->dithered_pf = v->undithered_pf = PF_Index;
1071      v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1072   }
1073   else {
1074      /* RGB WINDOW:
1075       * We support RGB rendering into almost any kind of visual.
1076       */
1077      const int xclass = v->mesa_visual.visualType;
1078      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1079	 setup_truecolor( v, b, cmap );
1080      }
1081      else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1082	 setup_monochrome( v, b );
1083      }
1084      else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1085         if (!setup_grayscale( client, v, b, cmap )) {
1086            return GL_FALSE;
1087         }
1088      }
1089      else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1090               && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1091	 if (!setup_dithered_color( client, v, b, cmap )) {
1092            return GL_FALSE;
1093         }
1094      }
1095      else {
1096	 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1097	 return GL_FALSE;
1098      }
1099      v->mesa_visual.indexBits = 0;
1100
1101      if (_mesa_getenv("MESA_NO_DITHER")) {
1102	 v->dithered_pf = v->undithered_pf;
1103      }
1104   }
1105
1106
1107   /*
1108    * If MESA_INFO env var is set print out some debugging info
1109    * which can help Brian figure out what's going on when a user
1110    * reports bugs.
1111    */
1112   if (_mesa_getenv("MESA_INFO")) {
1113      _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1114      _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1115      _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1116      _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1117      _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1118      _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1119   }
1120
1121   if (b && window) {
1122      char *data;
1123
1124      /* Do window-specific initializations */
1125
1126      /* these should have been set in create_xmesa_buffer */
1127      ASSERT(b->frontxrb->drawable == window);
1128      ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1129
1130      /* Setup for single/double buffering */
1131      if (v->mesa_visual.doubleBufferMode) {
1132         /* Double buffered */
1133         b->shm = check_for_xshm( v->display );
1134      }
1135
1136      /* X11 graphics contexts */
1137#ifdef XFree86Server
1138      b->gc = CreateScratchGC(v->display, window->depth);
1139#else
1140      b->gc = XCreateGC( v->display, window, 0, NULL );
1141#endif
1142      XMesaSetFunction( v->display, b->gc, GXcopy );
1143
1144      /* cleargc - for glClear() */
1145#ifdef XFree86Server
1146      b->cleargc = CreateScratchGC(v->display, window->depth);
1147#else
1148      b->cleargc = XCreateGC( v->display, window, 0, NULL );
1149#endif
1150      XMesaSetFunction( v->display, b->cleargc, GXcopy );
1151
1152      /*
1153       * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1154       * Patch contributed by Michael Pichler May 15, 1995.
1155       */
1156#ifdef XFree86Server
1157      b->swapgc = CreateScratchGC(v->display, window->depth);
1158      {
1159         CARD32 v[1];
1160         v[0] = FALSE;
1161         dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1162      }
1163#else
1164      {
1165         XGCValues gcvalues;
1166         gcvalues.graphics_exposures = False;
1167         b->swapgc = XCreateGC(v->display, window,
1168                               GCGraphicsExposures, &gcvalues);
1169      }
1170#endif
1171      XMesaSetFunction( v->display, b->swapgc, GXcopy );
1172      /*
1173       * Set fill style and tile pixmap once for all for HPCR stuff
1174       * (instead of doing it each time in clear_color_HPCR_pixmap())
1175       * Initialize whole stuff
1176       * Patch contributed by Jacques Leroy March 8, 1998.
1177       */
1178      if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1179         int i;
1180         for (i = 0; i < 16; i++) {
1181            XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1182            XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1183         }
1184         XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1185                       b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1186         XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1187         XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1188      }
1189
1190      /* Initialize the row buffer XImage for use in write_color_span() */
1191      data = (char*) MALLOC(MAX_WIDTH*4);
1192#ifdef XFree86Server
1193      b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1, data);
1194#else
1195      b->rowimage = XCreateImage( v->display,
1196                                  v->visinfo->visual,
1197                                  v->visinfo->depth,
1198                                  ZPixmap, 0,           /*format, offset*/
1199                                  data,                 /*data*/
1200                                  MAX_WIDTH, 1,         /*width, height*/
1201                                  32,                   /*bitmap_pad*/
1202                                  0                     /*bytes_per_line*/ );
1203#endif
1204      if (!b->rowimage)
1205         return GL_FALSE;
1206   }
1207
1208   return GL_TRUE;
1209}
1210
1211
1212
1213/*
1214 * Convert an RGBA color to a pixel value.
1215 */
1216unsigned long
1217xmesa_color_to_pixel(GLcontext *ctx,
1218                     GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1219                     GLuint pixelFormat)
1220{
1221   XMesaContext xmesa = XMESA_CONTEXT(ctx);
1222   switch (pixelFormat) {
1223      case PF_Index:
1224         return 0;
1225      case PF_Truecolor:
1226         {
1227            unsigned long p;
1228            PACK_TRUECOLOR( p, r, g, b );
1229            return p;
1230         }
1231      case PF_8A8B8G8R:
1232         return PACK_8A8B8G8R( r, g, b, a );
1233      case PF_8A8R8G8B:
1234         return PACK_8A8R8G8B( r, g, b, a );
1235      case PF_8R8G8B:
1236         /* fall through */
1237      case PF_8R8G8B24:
1238         return PACK_8R8G8B( r, g, b );
1239      case PF_5R6G5B:
1240         return PACK_5R6G5B( r, g, b );
1241      case PF_Dither:
1242         {
1243            DITHER_SETUP;
1244            return DITHER( 1, 0, r, g, b );
1245         }
1246      case PF_1Bit:
1247         /* 382 = (3*255)/2 */
1248         return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1249      case PF_HPCR:
1250         return DITHER_HPCR(1, 1, r, g, b);
1251      case PF_Lookup:
1252         {
1253            LOOKUP_SETUP;
1254            return LOOKUP( r, g, b );
1255         }
1256      case PF_Grayscale:
1257         return GRAY_RGB( r, g, b );
1258      case PF_Dither_True:
1259         /* fall through */
1260      case PF_Dither_5R6G5B:
1261         {
1262            unsigned long p;
1263            PACK_TRUEDITHER(p, 1, 0, r, g, b);
1264            return p;
1265         }
1266      default:
1267         _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1268   }
1269   return 0;
1270}
1271
1272
1273#define NUM_VISUAL_TYPES   6
1274
1275/**
1276 * Convert an X visual type to a GLX visual type.
1277 *
1278 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1279 *        to be converted.
1280 * \return If \c visualType is a valid X visual type, a GLX visual type will
1281 *         be returned.  Otherwise \c GLX_NONE will be returned.
1282 *
1283 * \note
1284 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1285 * DRI CVS tree.
1286 */
1287static GLint
1288xmesa_convert_from_x_visual_type( int visualType )
1289{
1290    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1291	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
1292	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1293	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
1294    };
1295
1296    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1297	? glx_visual_types[ visualType ] : GLX_NONE;
1298}
1299
1300
1301/**********************************************************************/
1302/*****                       Public Functions                     *****/
1303/**********************************************************************/
1304
1305
1306#ifdef IN_DRI_DRIVER
1307#define need_GL_VERSION_1_3
1308#define need_GL_VERSION_1_4
1309#define need_GL_VERSION_1_5
1310#define need_GL_VERSION_2_0
1311
1312/* sw extensions for imaging */
1313#define need_GL_EXT_blend_color
1314#define need_GL_EXT_blend_minmax
1315#define need_GL_EXT_convolution
1316#define need_GL_EXT_histogram
1317#define need_GL_SGI_color_table
1318
1319/* sw extensions not associated with some GL version */
1320#define need_GL_ARB_draw_elements_base_vertex
1321#define need_GL_ARB_shader_objects
1322#define need_GL_ARB_sync
1323#define need_GL_ARB_vertex_program
1324#define need_GL_APPLE_vertex_array_object
1325#define need_GL_ATI_fragment_shader
1326#define need_GL_EXT_depth_bounds_test
1327#define need_GL_EXT_framebuffer_object
1328#define need_GL_EXT_framebuffer_blit
1329#define need_GL_EXT_gpu_program_parameters
1330#define need_GL_EXT_paletted_texture
1331#define need_GL_MESA_resize_buffers
1332#define need_GL_NV_vertex_program
1333#define need_GL_NV_fragment_program
1334
1335#include "extension_helper.h"
1336#include "utils.h"
1337
1338const struct dri_extension card_extensions[] =
1339{
1340   { "GL_VERSION_1_3",			GL_VERSION_1_3_functions },
1341   { "GL_VERSION_1_4",			GL_VERSION_1_4_functions },
1342   { "GL_VERSION_1_5",			GL_VERSION_1_5_functions },
1343   { "GL_VERSION_2_0",			GL_VERSION_2_0_functions },
1344
1345   { "GL_EXT_blend_color",		GL_EXT_blend_color_functions },
1346   { "GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions },
1347   { "GL_EXT_convolution",		GL_EXT_convolution_functions },
1348   { "GL_EXT_histogram",		GL_EXT_histogram_functions },
1349   { "GL_SGI_color_table",		GL_SGI_color_table_functions },
1350
1351   { "GL_ARB_depth_clamp",		NULL },
1352   { "GL_ARB_draw_elements_base_vertex", GL_ARB_draw_elements_base_vertex_functions },
1353   { "GL_ARB_shader_objects",		GL_ARB_shader_objects_functions },
1354   { "GL_ARB_sync",			GL_ARB_sync_functions },
1355   { "GL_ARB_vertex_program",		GL_ARB_vertex_program_functions },
1356   { "GL_APPLE_vertex_array_object",	GL_APPLE_vertex_array_object_functions },
1357   { "GL_ATI_fragment_shader",		GL_ATI_fragment_shader_functions },
1358   { "GL_EXT_depth_bounds_test",	GL_EXT_depth_bounds_test_functions },
1359   { "GL_EXT_framebuffer_object",	GL_EXT_framebuffer_object_functions },
1360   { "GL_EXT_framebuffer_blit",		GL_EXT_framebuffer_blit_functions },
1361   { "GL_EXT_gpu_program_parameters",	GL_EXT_gpu_program_parameters_functions },
1362   { "GL_EXT_paletted_texture",		GL_EXT_paletted_texture_functions },
1363   { "GL_MESA_resize_buffers",		GL_MESA_resize_buffers_functions },
1364   { "GL_NV_depth_clamp",		NULL },
1365   { "GL_NV_vertex_program",		GL_NV_vertex_program_functions },
1366   { "GL_NV_fragment_program",		GL_NV_fragment_program_functions },
1367   { NULL,				NULL }
1368};
1369#endif
1370
1371/*
1372 * Create a new X/Mesa visual.
1373 * Input:  display - X11 display
1374 *         visinfo - an XVisualInfo pointer
1375 *         rgb_flag - GL_TRUE = RGB mode,
1376 *                    GL_FALSE = color index mode
1377 *         alpha_flag - alpha buffer requested?
1378 *         db_flag - GL_TRUE = double-buffered,
1379 *                   GL_FALSE = single buffered
1380 *         stereo_flag - stereo visual?
1381 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
1382 *                       GL_FALSE = use an off-screen pixmap for back buffer
1383 *         depth_size - requested bits/depth values, or zero
1384 *         stencil_size - requested bits/stencil values, or zero
1385 *         accum_red_size - requested bits/red accum values, or zero
1386 *         accum_green_size - requested bits/green accum values, or zero
1387 *         accum_blue_size - requested bits/blue accum values, or zero
1388 *         accum_alpha_size - requested bits/alpha accum values, or zero
1389 *         num_samples - number of samples/pixel if multisampling, or zero
1390 *         level - visual level, usually 0
1391 *         visualCaveat - ala the GLX extension, usually GLX_NONE
1392 * Return;  a new XMesaVisual or 0 if error.
1393 */
1394PUBLIC
1395XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1396                               XMesaVisualInfo visinfo,
1397                               GLboolean rgb_flag,
1398                               GLboolean alpha_flag,
1399                               GLboolean db_flag,
1400                               GLboolean stereo_flag,
1401                               GLboolean ximage_flag,
1402                               GLint depth_size,
1403                               GLint stencil_size,
1404                               GLint accum_red_size,
1405                               GLint accum_green_size,
1406                               GLint accum_blue_size,
1407                               GLint accum_alpha_size,
1408                               GLint num_samples,
1409                               GLint level,
1410                               GLint visualCaveat )
1411{
1412   char *gamma;
1413   XMesaVisual v;
1414   GLint red_bits, green_bits, blue_bits, alpha_bits;
1415
1416#ifdef IN_DRI_DRIVER
1417   /* driInitExtensions() should be called once per screen to setup extension
1418    * indices.  There is no need to call it when the context is created since
1419    * XMesa enables mesa sw extensions on its own.
1420    */
1421   driInitExtensions( NULL, card_extensions, GL_FALSE );
1422#endif
1423
1424#ifndef XFree86Server
1425   /* For debugging only */
1426   if (_mesa_getenv("MESA_XSYNC")) {
1427      /* This makes debugging X easier.
1428       * In your debugger, set a breakpoint on _XError to stop when an
1429       * X protocol error is generated.
1430       */
1431      XSynchronize( display, 1 );
1432   }
1433#endif
1434
1435   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1436   if (!v) {
1437      return NULL;
1438   }
1439
1440   v->display = display;
1441
1442   /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1443    * the struct but we may need some of the information contained in it
1444    * at a later time.
1445    */
1446#ifndef XFree86Server
1447   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1448   if(!v->visinfo) {
1449      _mesa_free(v);
1450      return NULL;
1451   }
1452   MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1453#endif
1454
1455   /* check for MESA_GAMMA environment variable */
1456   gamma = _mesa_getenv("MESA_GAMMA");
1457   if (gamma) {
1458      v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1459      sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1460      if (v->RedGamma<=0.0)    v->RedGamma = 1.0;
1461      if (v->GreenGamma<=0.0)  v->GreenGamma = v->RedGamma;
1462      if (v->BlueGamma<=0.0)   v->BlueGamma = v->RedGamma;
1463   }
1464   else {
1465      v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1466   }
1467
1468   v->ximage_flag = ximage_flag;
1469
1470#ifdef XFree86Server
1471   /* We could calculate these values by ourselves.  nplanes is either the sum
1472    * of the red, green, and blue bits or the number index bits.
1473    * ColormapEntries is either (1U << index_bits) or
1474    * (1U << max(redBits, greenBits, blueBits)).
1475    */
1476   assert(visinfo->nplanes > 0);
1477   v->nplanes = visinfo->nplanes;
1478   v->ColormapEntries = visinfo->ColormapEntries;
1479
1480   v->mesa_visual.redMask = visinfo->redMask;
1481   v->mesa_visual.greenMask = visinfo->greenMask;
1482   v->mesa_visual.blueMask = visinfo->blueMask;
1483   v->mesa_visual.visualID = visinfo->vid;
1484   v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1485#else
1486   v->mesa_visual.redMask = visinfo->red_mask;
1487   v->mesa_visual.greenMask = visinfo->green_mask;
1488   v->mesa_visual.blueMask = visinfo->blue_mask;
1489   v->mesa_visual.visualID = visinfo->visualid;
1490   v->mesa_visual.screen = visinfo->screen;
1491#endif
1492
1493#if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1494   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1495#else
1496   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1497#endif
1498
1499   v->mesa_visual.visualRating = visualCaveat;
1500
1501   if (alpha_flag)
1502      v->mesa_visual.alphaBits = 8;
1503
1504   (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
1505
1506   {
1507      const int xclass = v->mesa_visual.visualType;
1508      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1509         red_bits   = _mesa_bitcount(GET_REDMASK(v));
1510         green_bits = _mesa_bitcount(GET_GREENMASK(v));
1511         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
1512      }
1513      else {
1514         /* this is an approximation */
1515         int depth;
1516         depth = GET_VISUAL_DEPTH(v);
1517         red_bits = depth / 3;
1518         depth -= red_bits;
1519         green_bits = depth / 2;
1520         depth -= green_bits;
1521         blue_bits = depth;
1522         alpha_bits = 0;
1523         assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1524      }
1525      alpha_bits = v->mesa_visual.alphaBits;
1526   }
1527
1528   _mesa_initialize_visual( &v->mesa_visual,
1529                            rgb_flag, db_flag, stereo_flag,
1530                            red_bits, green_bits,
1531                            blue_bits, alpha_bits,
1532                            v->mesa_visual.indexBits,
1533                            depth_size,
1534                            stencil_size,
1535                            accum_red_size, accum_green_size,
1536                            accum_blue_size, accum_alpha_size,
1537                            0 );
1538
1539   /* XXX minor hack */
1540   v->mesa_visual.level = level;
1541   return v;
1542}
1543
1544
1545PUBLIC
1546void XMesaDestroyVisual( XMesaVisual v )
1547{
1548#ifndef XFree86Server
1549   _mesa_free(v->visinfo);
1550#endif
1551   _mesa_free(v);
1552}
1553
1554
1555
1556/**
1557 * Create a new XMesaContext.
1558 * \param v  the XMesaVisual
1559 * \param share_list  another XMesaContext with which to share display
1560 *                    lists or NULL if no sharing is wanted.
1561 * \return an XMesaContext or NULL if error.
1562 */
1563PUBLIC
1564XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1565{
1566   static GLboolean firstTime = GL_TRUE;
1567   XMesaContext c;
1568   GLcontext *mesaCtx;
1569   struct dd_function_table functions;
1570   TNLcontext *tnl;
1571
1572   if (firstTime) {
1573      _glthread_INIT_MUTEX(_xmesa_lock);
1574      firstTime = GL_FALSE;
1575   }
1576
1577   /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1578   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1579   if (!c)
1580      return NULL;
1581
1582   mesaCtx = &(c->mesa);
1583
1584   /* initialize with default driver functions, then plug in XMesa funcs */
1585   _mesa_init_driver_functions(&functions);
1586   xmesa_init_driver_functions(v, &functions);
1587   if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1588                      share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1589                      &functions, (void *) c)) {
1590      _mesa_free(c);
1591      return NULL;
1592   }
1593
1594   /* Enable this to exercise fixed function -> shader translation
1595    * with software rendering.
1596    */
1597   if (0) {
1598      mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
1599      mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
1600   }
1601
1602   _mesa_enable_sw_extensions(mesaCtx);
1603   _mesa_enable_1_3_extensions(mesaCtx);
1604   _mesa_enable_1_4_extensions(mesaCtx);
1605   _mesa_enable_1_5_extensions(mesaCtx);
1606   _mesa_enable_2_0_extensions(mesaCtx);
1607   _mesa_enable_2_1_extensions(mesaCtx);
1608#if ENABLE_EXT_texure_compression_s3tc
1609    if (mesaCtx->Mesa_DXTn) {
1610       _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1611       _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1612    }
1613    _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1614#endif
1615#if ENABLE_EXT_timer_query
1616    _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1617#endif
1618
1619#ifdef XFree86Server
1620   /* If we're running in the X server, do bounds checking to prevent
1621    * segfaults and server crashes!
1622    */
1623   mesaCtx->Const.CheckArrayBounds = GL_TRUE;
1624#endif
1625
1626   /* finish up xmesa context initializations */
1627   c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1628   c->xm_visual = v;
1629   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
1630   c->display = v->display;
1631   c->pixelformat = v->dithered_pf;      /* Dithering is enabled by default */
1632
1633   /* Initialize the software rasterizer and helper modules.
1634    */
1635   if (!_swrast_CreateContext( mesaCtx ) ||
1636       !_vbo_CreateContext( mesaCtx ) ||
1637       !_tnl_CreateContext( mesaCtx ) ||
1638       !_swsetup_CreateContext( mesaCtx )) {
1639      _mesa_free_context_data(&c->mesa);
1640      _mesa_free(c);
1641      return NULL;
1642   }
1643
1644   /* tnl setup */
1645   tnl = TNL_CONTEXT(mesaCtx);
1646   tnl->Driver.RunPipeline = _tnl_run_pipeline;
1647   /* swrast setup */
1648   xmesa_register_swrast_functions( mesaCtx );
1649   _swsetup_Wakeup(mesaCtx);
1650
1651   if (TEST_META_FUNCS)
1652      _mesa_meta_init(mesaCtx);
1653
1654   return c;
1655}
1656
1657
1658
1659PUBLIC
1660void XMesaDestroyContext( XMesaContext c )
1661{
1662   GLcontext *mesaCtx = &c->mesa;
1663
1664#ifdef FX
1665   FXdestroyContext( XMESA_BUFFER(mesaCtx->DrawBuffer) );
1666#endif
1667
1668   if (TEST_META_FUNCS)
1669      _mesa_meta_free( mesaCtx );
1670
1671   _swsetup_DestroyContext( mesaCtx );
1672   _swrast_DestroyContext( mesaCtx );
1673   _tnl_DestroyContext( mesaCtx );
1674   _vbo_DestroyContext( mesaCtx );
1675   _mesa_free_context_data( mesaCtx );
1676   _mesa_free( c );
1677}
1678
1679
1680
1681/**
1682 * Private function for creating an XMesaBuffer which corresponds to an
1683 * X window or pixmap.
1684 * \param v  the window's XMesaVisual
1685 * \param w  the window we're wrapping
1686 * \return  new XMesaBuffer or NULL if error
1687 */
1688PUBLIC XMesaBuffer
1689XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1690{
1691#ifndef XFree86Server
1692   XWindowAttributes attr;
1693#endif
1694   XMesaBuffer b;
1695   XMesaColormap cmap;
1696   int depth;
1697
1698   assert(v);
1699   assert(w);
1700
1701   /* Check that window depth matches visual depth */
1702#ifdef XFree86Server
1703   depth = ((XMesaDrawable)w)->depth;
1704#else
1705   XGetWindowAttributes( v->display, w, &attr );
1706   depth = attr.depth;
1707#endif
1708   if (GET_VISUAL_DEPTH(v) != depth) {
1709      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1710                    GET_VISUAL_DEPTH(v), depth);
1711      return NULL;
1712   }
1713
1714   /* Find colormap */
1715#ifdef XFree86Server
1716   cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1717#else
1718   if (attr.colormap) {
1719      cmap = attr.colormap;
1720   }
1721   else {
1722      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1723      /* this is weird, a window w/out a colormap!? */
1724      /* OK, let's just allocate a new one and hope for the best */
1725      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1726   }
1727#endif
1728
1729   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1730   if (!b)
1731      return NULL;
1732
1733   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
1734                                      (XMesaDrawable) w, cmap )) {
1735      xmesa_free_buffer(b);
1736      return NULL;
1737   }
1738
1739   return b;
1740}
1741
1742
1743
1744/**
1745 * Create a new XMesaBuffer from an X pixmap.
1746 *
1747 * \param v    the XMesaVisual
1748 * \param p    the pixmap
1749 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1750 *             \c GLX_DIRECT_COLOR visual for the pixmap
1751 * \returns new XMesaBuffer or NULL if error
1752 */
1753PUBLIC XMesaBuffer
1754XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1755{
1756   XMesaBuffer b;
1757
1758   assert(v);
1759
1760   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1761   if (!b)
1762      return NULL;
1763
1764   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1765				     (XMesaDrawable) p, cmap)) {
1766      xmesa_free_buffer(b);
1767      return NULL;
1768   }
1769
1770   return b;
1771}
1772
1773
1774/**
1775 * For GLX_EXT_texture_from_pixmap
1776 */
1777XMesaBuffer
1778XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1779                               XMesaColormap cmap,
1780                               int format, int target, int mipmap)
1781{
1782   GET_CURRENT_CONTEXT(ctx);
1783   XMesaBuffer b;
1784   GLuint width, height;
1785
1786   assert(v);
1787
1788   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1789   if (!b)
1790      return NULL;
1791
1792   /* get pixmap size, update framebuffer/renderbuffer dims */
1793   xmesa_get_window_size(v->display, b, &width, &height);
1794   _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1795
1796   if (target == 0) {
1797      /* examine dims */
1798      if (ctx->Extensions.ARB_texture_non_power_of_two) {
1799         target = GLX_TEXTURE_2D_EXT;
1800      }
1801      else if (   _mesa_bitcount(width)  == 1
1802               && _mesa_bitcount(height) == 1) {
1803         /* power of two size */
1804         if (height == 1) {
1805            target = GLX_TEXTURE_1D_EXT;
1806         }
1807         else {
1808            target = GLX_TEXTURE_2D_EXT;
1809         }
1810      }
1811      else if (ctx->Extensions.NV_texture_rectangle) {
1812         target = GLX_TEXTURE_RECTANGLE_EXT;
1813      }
1814      else {
1815         /* non power of two textures not supported */
1816         XMesaDestroyBuffer(b);
1817         return 0;
1818      }
1819   }
1820
1821   b->TextureTarget = target;
1822   b->TextureFormat = format;
1823   b->TextureMipmap = mipmap;
1824
1825   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1826				     (XMesaDrawable) p, cmap)) {
1827      xmesa_free_buffer(b);
1828      return NULL;
1829   }
1830
1831   return b;
1832}
1833
1834
1835
1836XMesaBuffer
1837XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1838                   unsigned int width, unsigned int height)
1839{
1840#ifndef XFree86Server
1841   XMesaWindow root;
1842   XMesaDrawable drawable;  /* X Pixmap Drawable */
1843   XMesaBuffer b;
1844
1845   /* allocate pixmap for front buffer */
1846   root = RootWindow( v->display, v->visinfo->screen );
1847   drawable = XCreatePixmap(v->display, root, width, height,
1848                            v->visinfo->depth);
1849   if (!drawable)
1850      return NULL;
1851
1852   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1853   if (!b)
1854      return NULL;
1855
1856   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1857				     drawable, cmap)) {
1858      xmesa_free_buffer(b);
1859      return NULL;
1860   }
1861
1862   return b;
1863#else
1864   return 0;
1865#endif
1866}
1867
1868
1869
1870/*
1871 * Deallocate an XMesaBuffer structure and all related info.
1872 */
1873PUBLIC void
1874XMesaDestroyBuffer(XMesaBuffer b)
1875{
1876   xmesa_free_buffer(b);
1877}
1878
1879
1880/**
1881 * Query the current window size and update the corresponding GLframebuffer
1882 * and all attached renderbuffers.
1883 * Called when:
1884 *  1. the first time a buffer is bound to a context.
1885 *  2. from glViewport to poll for window size changes
1886 *  3. from the XMesaResizeBuffers() API function.
1887 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1888 * when resizing a buffer when no rendering context is bound.
1889 */
1890void
1891xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1892{
1893   GLuint width, height;
1894   xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1895   if (drawBuffer->mesa_buffer.Width != width ||
1896       drawBuffer->mesa_buffer.Height != height) {
1897      GLcontext *ctx = xmctx ? &xmctx->mesa : NULL;
1898      _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1899   }
1900   drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1901}
1902
1903
1904/*
1905 * Bind buffer b to context c and make c the current rendering context.
1906 */
1907GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1908{
1909   return XMesaMakeCurrent2( c, b, b );
1910}
1911
1912
1913/*
1914 * Bind buffer b to context c and make c the current rendering context.
1915 */
1916PUBLIC
1917GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1918                             XMesaBuffer readBuffer )
1919{
1920   if (c) {
1921      if (!drawBuffer || !readBuffer)
1922         return GL_FALSE;  /* must specify buffers! */
1923
1924      if (&(c->mesa) == _mesa_get_current_context()
1925          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1926          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1927          && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1928         /* same context and buffer, do nothing */
1929         return GL_TRUE;
1930      }
1931
1932      c->xm_buffer = drawBuffer;
1933
1934#ifdef FX
1935      if (FXmakeCurrent( drawBuffer ))
1936         return GL_TRUE;
1937#endif
1938
1939      /* Call this periodically to detect when the user has begun using
1940       * GL rendering from multiple threads.
1941       */
1942      _glapi_check_multithread();
1943
1944      xmesa_check_and_update_buffer_size(c, drawBuffer);
1945      if (readBuffer != drawBuffer)
1946         xmesa_check_and_update_buffer_size(c, readBuffer);
1947
1948      _mesa_make_current(&(c->mesa),
1949                         &drawBuffer->mesa_buffer,
1950                         &readBuffer->mesa_buffer);
1951
1952      if (c->xm_visual->mesa_visual.rgbMode) {
1953         /*
1954          * Must recompute and set these pixel values because colormap
1955          * can be different for different windows.
1956          */
1957         c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1958                                               c->clearcolor[0],
1959                                               c->clearcolor[1],
1960                                               c->clearcolor[2],
1961                                               c->clearcolor[3],
1962                                               c->xm_visual->undithered_pf);
1963         XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1964      }
1965
1966      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1967      drawBuffer->wasCurrent = GL_TRUE;
1968   }
1969   else {
1970      /* Detach */
1971      _mesa_make_current( NULL, NULL, NULL );
1972   }
1973   return GL_TRUE;
1974}
1975
1976
1977/*
1978 * Unbind the context c from its buffer.
1979 */
1980GLboolean XMesaUnbindContext( XMesaContext c )
1981{
1982   /* A no-op for XFree86 integration purposes */
1983   return GL_TRUE;
1984}
1985
1986
1987XMesaContext XMesaGetCurrentContext( void )
1988{
1989   GET_CURRENT_CONTEXT(ctx);
1990   if (ctx) {
1991      XMesaContext xmesa = XMESA_CONTEXT(ctx);
1992      return xmesa;
1993   }
1994   else {
1995      return 0;
1996   }
1997}
1998
1999
2000XMesaBuffer XMesaGetCurrentBuffer( void )
2001{
2002   GET_CURRENT_CONTEXT(ctx);
2003   if (ctx) {
2004      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
2005      return xmbuf;
2006   }
2007   else {
2008      return 0;
2009   }
2010}
2011
2012
2013/* New in Mesa 3.1 */
2014XMesaBuffer XMesaGetCurrentReadBuffer( void )
2015{
2016   GET_CURRENT_CONTEXT(ctx);
2017   if (ctx) {
2018      return XMESA_BUFFER(ctx->ReadBuffer);
2019   }
2020   else {
2021      return 0;
2022   }
2023}
2024
2025
2026#ifdef XFree86Server
2027PUBLIC
2028GLboolean XMesaForceCurrent(XMesaContext c)
2029{
2030   if (c) {
2031      _glapi_set_dispatch(c->mesa.CurrentDispatch);
2032
2033      if (&(c->mesa) != _mesa_get_current_context()) {
2034	 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
2035      }
2036   }
2037   else {
2038      _mesa_make_current(NULL, NULL, NULL);
2039   }
2040   return GL_TRUE;
2041}
2042
2043
2044PUBLIC
2045GLboolean XMesaLoseCurrent(XMesaContext c)
2046{
2047   (void) c;
2048   _mesa_make_current(NULL, NULL, NULL);
2049   return GL_TRUE;
2050}
2051
2052
2053PUBLIC
2054GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
2055{
2056   _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
2057   return GL_TRUE;
2058}
2059#endif /* XFree86Server */
2060
2061
2062#ifndef FX
2063GLboolean XMesaSetFXmode( GLint mode )
2064{
2065   (void) mode;
2066   return GL_FALSE;
2067}
2068#endif
2069
2070
2071
2072/*
2073 * Copy the back buffer to the front buffer.  If there's no back buffer
2074 * this is a no-op.
2075 */
2076PUBLIC
2077void XMesaSwapBuffers( XMesaBuffer b )
2078{
2079   GET_CURRENT_CONTEXT(ctx);
2080
2081   if (!b->backxrb) {
2082      /* single buffered */
2083      return;
2084   }
2085
2086   /* If we're swapping the buffer associated with the current context
2087    * we have to flush any pending rendering commands first.
2088    */
2089   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2090      _mesa_notifySwapBuffers(ctx);
2091
2092   if (b->db_mode) {
2093#ifdef FX
2094      if (FXswapBuffers(b))
2095         return;
2096#endif
2097      if (b->backxrb->ximage) {
2098	 /* Copy Ximage (back buf) from client memory to server window */
2099#if defined(USE_XSHM) && !defined(XFree86Server)
2100	 if (b->shm) {
2101            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2102	    XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2103			  b->swapgc,
2104			  b->backxrb->ximage, 0, 0,
2105			  0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2106                          False );
2107            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2108	 }
2109	 else
2110#endif
2111         {
2112            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2113            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2114			   b->swapgc,
2115			   b->backxrb->ximage, 0, 0,
2116			   0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2117            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2118         }
2119      }
2120      else if (b->backxrb->pixmap) {
2121	 /* Copy pixmap (back buf) to window (front buf) on server */
2122         /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2123	 XMesaCopyArea( b->xm_visual->display,
2124			b->backxrb->pixmap,   /* source drawable */
2125			b->frontxrb->drawable,  /* dest. drawable */
2126			b->swapgc,
2127			0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2128			0, 0                 /* dest region */
2129		      );
2130         /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2131      }
2132
2133      if (b->swAlpha)
2134         _mesa_copy_soft_alpha_renderbuffers(ctx, &b->mesa_buffer);
2135   }
2136#if !defined(XFree86Server)
2137   XSync( b->xm_visual->display, False );
2138#endif
2139}
2140
2141
2142
2143/*
2144 * Copy sub-region of back buffer to front buffer
2145 */
2146void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2147{
2148   GET_CURRENT_CONTEXT(ctx);
2149
2150   /* If we're swapping the buffer associated with the current context
2151    * we have to flush any pending rendering commands first.
2152    */
2153   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2154      _mesa_notifySwapBuffers(ctx);
2155
2156   if (!b->backxrb) {
2157      /* single buffered */
2158      return;
2159   }
2160
2161   if (b->db_mode) {
2162      int yTop = b->mesa_buffer.Height - y - height;
2163#ifdef FX
2164      if (FXswapBuffers(b))
2165         return;
2166#endif
2167      if (b->backxrb->ximage) {
2168         /* Copy Ximage from host's memory to server's window */
2169#if defined(USE_XSHM) && !defined(XFree86Server)
2170         if (b->shm) {
2171            /* XXX assuming width and height aren't too large! */
2172            XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2173                          b->swapgc,
2174                          b->backxrb->ximage, x, yTop,
2175                          x, yTop, width, height, False );
2176            /* wait for finished event??? */
2177         }
2178         else
2179#endif
2180         {
2181            /* XXX assuming width and height aren't too large! */
2182            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2183			   b->swapgc,
2184			   b->backxrb->ximage, x, yTop,
2185			   x, yTop, width, height );
2186         }
2187      }
2188      else {
2189         /* Copy pixmap to window on server */
2190         XMesaCopyArea( b->xm_visual->display,
2191			b->backxrb->pixmap,           /* source drawable */
2192			b->frontxrb->drawable,        /* dest. drawable */
2193			b->swapgc,
2194			x, yTop, width, height,  /* source region */
2195			x, yTop                  /* dest region */
2196                      );
2197      }
2198   }
2199}
2200
2201
2202/*
2203 * Return a pointer to the XMesa backbuffer Pixmap or XImage.  This function
2204 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2205 * back buffer directly.
2206 * Output:  pixmap - pointer to back buffer's Pixmap, or 0
2207 *          ximage - pointer to back buffer's XImage, or NULL
2208 * Return:  GL_TRUE = context is double buffered
2209 *          GL_FALSE = context is single buffered
2210 */
2211#ifndef XFree86Server
2212GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2213                              XMesaPixmap *pixmap,
2214                              XMesaImage **ximage )
2215{
2216   if (b->db_mode) {
2217      if (pixmap)
2218         *pixmap = b->backxrb->pixmap;
2219      if (ximage)
2220         *ximage = b->backxrb->ximage;
2221      return GL_TRUE;
2222   }
2223   else {
2224      *pixmap = 0;
2225      *ximage = NULL;
2226      return GL_FALSE;
2227   }
2228}
2229#endif /* XFree86Server */
2230
2231
2232/*
2233 * Return the depth buffer associated with an XMesaBuffer.
2234 * Input:  b - the XMesa buffer handle
2235 * Output:  width, height - size of buffer in pixels
2236 *          bytesPerValue - bytes per depth value (2 or 4)
2237 *          buffer - pointer to depth buffer values
2238 * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
2239 */
2240GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2241                               GLint *bytesPerValue, void **buffer )
2242{
2243   struct gl_renderbuffer *rb
2244      = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2245   if (!rb || !rb->Data) {
2246      *width = 0;
2247      *height = 0;
2248      *bytesPerValue = 0;
2249      *buffer = 0;
2250      return GL_FALSE;
2251   }
2252   else {
2253      *width = b->mesa_buffer.Width;
2254      *height = b->mesa_buffer.Height;
2255      *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2256         ? sizeof(GLushort) : sizeof(GLuint);
2257      *buffer = rb->Data;
2258      return GL_TRUE;
2259   }
2260}
2261
2262
2263void XMesaFlush( XMesaContext c )
2264{
2265   if (c && c->xm_visual) {
2266#ifdef XFree86Server
2267      /* NOT_NEEDED */
2268#else
2269      XSync( c->xm_visual->display, False );
2270#endif
2271   }
2272}
2273
2274
2275
2276const char *XMesaGetString( XMesaContext c, int name )
2277{
2278   (void) c;
2279   if (name==XMESA_VERSION) {
2280      return "5.0";
2281   }
2282   else if (name==XMESA_EXTENSIONS) {
2283      return "";
2284   }
2285   else {
2286      return NULL;
2287   }
2288}
2289
2290
2291
2292XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2293{
2294   XMesaBuffer b;
2295   for (b=XMesaBufferList; b; b=b->Next) {
2296      if (b->frontxrb->drawable == d && b->display == dpy) {
2297         return b;
2298      }
2299   }
2300   return NULL;
2301}
2302
2303
2304/**
2305 * Free/destroy all XMesaBuffers associated with given display.
2306 */
2307void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2308{
2309   XMesaBuffer b, next;
2310   for (b = XMesaBufferList; b; b = next) {
2311      next = b->Next;
2312      if (b->display == dpy) {
2313         xmesa_free_buffer(b);
2314      }
2315   }
2316}
2317
2318
2319/*
2320 * Look for XMesaBuffers whose X window has been destroyed.
2321 * Deallocate any such XMesaBuffers.
2322 */
2323void XMesaGarbageCollect( void )
2324{
2325   XMesaBuffer b, next;
2326   for (b=XMesaBufferList; b; b=next) {
2327      next = b->Next;
2328      if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2329#ifdef XFree86Server
2330	 /* NOT_NEEDED */
2331#else
2332         XSync(b->display, False);
2333         if (!window_exists( b->display, b->frontxrb->drawable )) {
2334            /* found a dead window, free the ancillary info */
2335            XMesaDestroyBuffer( b );
2336         }
2337#endif
2338      }
2339   }
2340}
2341
2342
2343unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2344                                GLfloat red, GLfloat green,
2345                                GLfloat blue, GLfloat alpha )
2346{
2347   GLcontext *ctx = &xmesa->mesa;
2348   GLint r = (GLint) (red   * 255.0F);
2349   GLint g = (GLint) (green * 255.0F);
2350   GLint b = (GLint) (blue  * 255.0F);
2351   GLint a = (GLint) (alpha * 255.0F);
2352
2353   switch (xmesa->pixelformat) {
2354      case PF_Index:
2355         return 0;
2356      case PF_Truecolor:
2357         {
2358            unsigned long p;
2359            PACK_TRUECOLOR( p, r, g, b );
2360            return p;
2361         }
2362      case PF_8A8B8G8R:
2363         return PACK_8A8B8G8R( r, g, b, a );
2364      case PF_8A8R8G8B:
2365         return PACK_8A8R8G8B( r, g, b, a );
2366      case PF_8R8G8B:
2367         return PACK_8R8G8B( r, g, b );
2368      case PF_5R6G5B:
2369         return PACK_5R6G5B( r, g, b );
2370      case PF_Dither:
2371         {
2372            DITHER_SETUP;
2373            return DITHER( x, y, r, g, b );
2374         }
2375      case PF_1Bit:
2376         /* 382 = (3*255)/2 */
2377         return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2378      case PF_HPCR:
2379         return DITHER_HPCR(x, y, r, g, b);
2380      case PF_Lookup:
2381         {
2382            LOOKUP_SETUP;
2383            return LOOKUP( r, g, b );
2384         }
2385      case PF_Grayscale:
2386         return GRAY_RGB( r, g, b );
2387      case PF_Dither_5R6G5B:
2388         /* fall through */
2389      case PF_Dither_True:
2390         {
2391            unsigned long p;
2392            PACK_TRUEDITHER(p, x, y, r, g, b);
2393            return p;
2394         }
2395      default:
2396         _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2397   }
2398   return 0;
2399}
2400
2401
2402/*
2403 * This is typically called when the window size changes and we need
2404 * to reallocate the buffer's back/depth/stencil/accum buffers.
2405 */
2406PUBLIC void
2407XMesaResizeBuffers( XMesaBuffer b )
2408{
2409   GET_CURRENT_CONTEXT(ctx);
2410   XMesaContext xmctx = XMESA_CONTEXT(ctx);
2411   if (!xmctx)
2412      return;
2413   xmesa_check_and_update_buffer_size(xmctx, b);
2414}
2415
2416
2417static GLint
2418xbuffer_to_renderbuffer(int buffer)
2419{
2420   assert(MAX_AUX_BUFFERS <= 4);
2421
2422   switch (buffer) {
2423   case GLX_FRONT_LEFT_EXT:
2424      return BUFFER_FRONT_LEFT;
2425   case GLX_FRONT_RIGHT_EXT:
2426      return BUFFER_FRONT_RIGHT;
2427   case GLX_BACK_LEFT_EXT:
2428      return BUFFER_BACK_LEFT;
2429   case GLX_BACK_RIGHT_EXT:
2430      return BUFFER_BACK_RIGHT;
2431   case GLX_AUX0_EXT:
2432      return BUFFER_AUX0;
2433   case GLX_AUX1_EXT:
2434   case GLX_AUX2_EXT:
2435   case GLX_AUX3_EXT:
2436   case GLX_AUX4_EXT:
2437   case GLX_AUX5_EXT:
2438   case GLX_AUX6_EXT:
2439   case GLX_AUX7_EXT:
2440   case GLX_AUX8_EXT:
2441   case GLX_AUX9_EXT:
2442   default:
2443      /* BadValue error */
2444      return -1;
2445   }
2446}
2447
2448
2449PUBLIC void
2450XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
2451                  const int *attrib_list)
2452{
2453#if 0
2454   GET_CURRENT_CONTEXT(ctx);
2455   const GLuint unit = ctx->Texture.CurrentUnit;
2456   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
2457   struct gl_texture_object *texObj;
2458#endif
2459   struct gl_renderbuffer *rb;
2460   struct xmesa_renderbuffer *xrb;
2461   GLint b;
2462   XMesaImage *img = NULL;
2463   GLboolean freeImg = GL_FALSE;
2464
2465   b = xbuffer_to_renderbuffer(buffer);
2466   if (b < 0)
2467      return;
2468
2469   if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
2470      return; /* BadMatch error */
2471
2472   rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
2473   if (!rb) {
2474      /* invalid buffer */
2475      return;
2476   }
2477   xrb = xmesa_renderbuffer(rb);
2478
2479#if 0
2480   switch (drawable->TextureTarget) {
2481   case GLX_TEXTURE_1D_EXT:
2482      texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
2483      break;
2484   case GLX_TEXTURE_2D_EXT:
2485      texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
2486      break;
2487   case GLX_TEXTURE_RECTANGLE_EXT:
2488      texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
2489      break;
2490   default:
2491      return; /* BadMatch error */
2492   }
2493#endif
2494
2495   /*
2496    * The following is a quick and simple way to implement
2497    * BindTexImage.  The better way is to write some new FetchTexel()
2498    * functions which would extract texels from XImages.  We'd still
2499    * need to use GetImage when texturing from a Pixmap (front buffer)
2500    * but texturing from a back buffer (XImage) would avoid an image
2501    * copy.
2502    */
2503
2504   /* get XImage */
2505   if (xrb->pixmap) {
2506      img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
2507			  ZPixmap);
2508      freeImg = GL_TRUE;
2509   }
2510   else if (xrb->ximage) {
2511      img = xrb->ximage;
2512   }
2513
2514   /* store the XImage as a new texture image */
2515   if (img) {
2516      GLenum format, type, intFormat;
2517      if (img->bits_per_pixel == 32) {
2518         format = GL_BGRA;
2519         type = GL_UNSIGNED_BYTE;
2520         intFormat = GL_RGBA;
2521      }
2522      else if (img->bits_per_pixel == 24) {
2523         format = GL_BGR;
2524         type = GL_UNSIGNED_BYTE;
2525         intFormat = GL_RGB;
2526      }
2527      else if (img->bits_per_pixel == 16) {
2528         format = GL_BGR;
2529         type = GL_UNSIGNED_SHORT_5_6_5;
2530         intFormat = GL_RGB;
2531      }
2532      else {
2533         _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
2534         return;
2535      }
2536      if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
2537         intFormat = GL_RGBA;
2538      }
2539      else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
2540         intFormat = GL_RGB;
2541      }
2542
2543      _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
2544                       format, type, img->data);
2545
2546      if (freeImg) {
2547	 XMesaDestroyImage(img);
2548      }
2549   }
2550}
2551
2552
2553
2554PUBLIC void
2555XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
2556{
2557   const GLint b = xbuffer_to_renderbuffer(buffer);
2558   if (b < 0)
2559      return;
2560
2561   /* no-op for now */
2562}
2563
2564