xm_api.c revision ba7218061b6a6c09d5d20f12de6267673276e094 
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/s_renderbuffer.h"
77#include "swrast_setup/swrast_setup.h"
78#include "vbo/vbo.h"
79#include "tnl/tnl.h"
80#include "tnl/t_context.h"
81#include "tnl/t_pipeline.h"
82#include "drivers/common/driverfuncs.h"
83#include "drivers/common/meta.h"
84
85/**
86 * Global X driver lock
87 */
88_glthread_Mutex _xmesa_lock;
89
90
91
92/**********************************************************************/
93/*****                     X Utility Functions                    *****/
94/**********************************************************************/
95
96
97/**
98 * Return the host's byte order as LSBFirst or MSBFirst ala X.
99 */
100static int host_byte_order( void )
101{
102   int i = 1;
103   char *cptr = (char *) &i;
104   return (*cptr==1) ? LSBFirst : MSBFirst;
105}
106
107
108/**
109 * Check if the X Shared Memory extension is available.
110 * Return:  0 = not available
111 *          1 = shared XImage support available
112 *          2 = shared Pixmap support available also
113 */
114static int check_for_xshm( XMesaDisplay *display )
115{
116#if defined(USE_XSHM)
117   int ignore;
118
119   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
120      /* Note: we're no longer calling XShmQueryVersion() here.  It seems
121       * to be flakey (triggers a spurious X protocol error when we close
122       * one display connection and start using a new one.  XShm has been
123       * around a long time and hasn't changed so if MIT_SHM is supported
124       * we assume we're good to go.
125       */
126      return 2;
127   }
128   else {
129      return 0;
130   }
131#else
132   /* No  XSHM support */
133   return 0;
134#endif
135}
136
137
138/**
139 * Apply gamma correction to an intensity value in [0..max].  Return the
140 * new intensity value.
141 */
142static GLint
143gamma_adjust( GLfloat gamma, GLint value, GLint max )
144{
145   if (gamma == 1.0) {
146      return value;
147   }
148   else {
149      double x = (double) value / (double) max;
150      return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
151   }
152}
153
154
155
156/**
157 * Return the true number of bits per pixel for XImages.
158 * For example, if we request a 24-bit deep visual we may actually need/get
159 * 32bpp XImages.  This function returns the appropriate bpp.
160 * Input:  dpy - the X display
161 *         visinfo - desribes the visual to be used for XImages
162 * Return:  true number of bits per pixel for XImages
163 */
164static int
165bits_per_pixel( XMesaVisual xmv )
166{
167   XMesaDisplay *dpy = xmv->display;
168   XMesaVisualInfo visinfo = xmv->visinfo;
169   XMesaImage *img;
170   int bitsPerPixel;
171   /* Create a temporary XImage */
172   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
173		       ZPixmap, 0,           /*format, offset*/
174		       (char*) MALLOC(8),    /*data*/
175		       1, 1,                 /*width, height*/
176		       32,                   /*bitmap_pad*/
177		       0                     /*bytes_per_line*/
178                     );
179   assert(img);
180   /* grab the bits/pixel value */
181   bitsPerPixel = img->bits_per_pixel;
182   /* free the XImage */
183   free( img->data );
184   img->data = NULL;
185   XMesaDestroyImage( img );
186   return bitsPerPixel;
187}
188
189
190
191/*
192 * Determine if a given X window ID is valid (window exists).
193 * Do this by calling XGetWindowAttributes() for the window and
194 * checking if we catch an X error.
195 * Input:  dpy - the display
196 *         win - the window to check for existance
197 * Return:  GL_TRUE - window exists
198 *          GL_FALSE - window doesn't exist
199 */
200static GLboolean WindowExistsFlag;
201
202static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
203{
204   (void) dpy;
205   if (xerr->error_code == BadWindow) {
206      WindowExistsFlag = GL_FALSE;
207   }
208   return 0;
209}
210
211static GLboolean window_exists( XMesaDisplay *dpy, Window win )
212{
213   XWindowAttributes wa;
214   int (*old_handler)( XMesaDisplay*, XErrorEvent* );
215   WindowExistsFlag = GL_TRUE;
216   old_handler = XSetErrorHandler(window_exists_err_handler);
217   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
218   XSetErrorHandler(old_handler);
219   return WindowExistsFlag;
220}
221
222static Status
223get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
224{
225   Window root;
226   Status stat;
227   int xpos, ypos;
228   unsigned int w, h, bw, depth;
229   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
230   *width = w;
231   *height = h;
232   return stat;
233}
234
235
236/**
237 * Return the size of the window (or pixmap) that corresponds to the
238 * given XMesaBuffer.
239 * \param width  returns width in pixels
240 * \param height  returns height in pixels
241 */
242void
243xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
244                      GLuint *width, GLuint *height)
245{
246   Status stat;
247
248   _glthread_LOCK_MUTEX(_xmesa_lock);
249   XSync(b->xm_visual->display, 0); /* added for Chromium */
250   stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
251   _glthread_UNLOCK_MUTEX(_xmesa_lock);
252
253   if (!stat) {
254      /* probably querying a window that's recently been destroyed */
255      _mesa_warning(NULL, "XGetGeometry failed!\n");
256      *width = *height = 1;
257   }
258}
259
260
261
262/**********************************************************************/
263/*****                Linked list of XMesaBuffers                 *****/
264/**********************************************************************/
265
266XMesaBuffer XMesaBufferList = NULL;
267
268
269/**
270 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
271 * Note that XMesaBuffer is derived from struct gl_framebuffer.
272 * The new XMesaBuffer will not have any size (Width=Height=0).
273 *
274 * \param d  the corresponding X drawable (window or pixmap)
275 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
276 * \param vis  the buffer's visual
277 * \param cmap  the window's colormap, if known.
278 * \return new XMesaBuffer or NULL if any problem
279 */
280static XMesaBuffer
281create_xmesa_buffer(XMesaDrawable d, BufferType type,
282                    XMesaVisual vis, XMesaColormap cmap)
283{
284   XMesaBuffer b;
285
286   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
287
288   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
289   if (!b)
290      return NULL;
291
292   b->display = vis->display;
293   b->xm_visual = vis;
294   b->type = type;
295   b->cmap = cmap;
296
297   _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
298   b->mesa_buffer.Delete = xmesa_delete_framebuffer;
299
300   /*
301    * Front renderbuffer
302    */
303   b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
304   if (!b->frontxrb) {
305      free(b);
306      return NULL;
307   }
308   b->frontxrb->Parent = b;
309   b->frontxrb->drawable = d;
310   b->frontxrb->pixmap = (XMesaPixmap) d;
311   _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
312                          &b->frontxrb->Base.Base);
313
314   /*
315    * Back renderbuffer
316    */
317   if (vis->mesa_visual.doubleBufferMode) {
318      b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
319      if (!b->backxrb) {
320         /* XXX free front xrb too */
321         free(b);
322         return NULL;
323      }
324      b->backxrb->Parent = b;
325      /* determine back buffer implementation */
326      b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
327
328      _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
329                             &b->backxrb->Base.Base);
330   }
331
332   /*
333    * Other renderbuffer (depth, stencil, etc)
334    */
335   _swrast_add_soft_renderbuffers(&b->mesa_buffer,
336                                  GL_FALSE,  /* color */
337                                  vis->mesa_visual.haveDepthBuffer,
338                                  vis->mesa_visual.haveStencilBuffer,
339                                  vis->mesa_visual.haveAccumBuffer,
340                                  GL_FALSE,  /* software alpha buffer */
341                                  vis->mesa_visual.numAuxBuffers > 0 );
342
343   /* GLX_EXT_texture_from_pixmap */
344   b->TextureTarget = 0;
345   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
346   b->TextureMipmap = 0;
347
348   /* insert buffer into linked list */
349   b->Next = XMesaBufferList;
350   XMesaBufferList = b;
351
352   return b;
353}
354
355
356/**
357 * Find an XMesaBuffer by matching X display and colormap but NOT matching
358 * the notThis buffer.
359 */
360XMesaBuffer
361xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
362{
363   XMesaBuffer b;
364   for (b=XMesaBufferList; b; b=b->Next) {
365      if (b->display==dpy && b->cmap==cmap && b!=notThis) {
366         return b;
367      }
368   }
369   return NULL;
370}
371
372
373/**
374 * Remove buffer from linked list, delete if no longer referenced.
375 */
376static void
377xmesa_free_buffer(XMesaBuffer buffer)
378{
379   XMesaBuffer prev = NULL, b;
380
381   for (b = XMesaBufferList; b; b = b->Next) {
382      if (b == buffer) {
383         struct gl_framebuffer *fb = &buffer->mesa_buffer;
384
385         /* unlink buffer from list */
386         if (prev)
387            prev->Next = buffer->Next;
388         else
389            XMesaBufferList = buffer->Next;
390
391         /* mark as delete pending */
392         fb->DeletePending = GL_TRUE;
393
394         /* Since the X window for the XMesaBuffer is going away, we don't
395          * want to dereference this pointer in the future.
396          */
397         b->frontxrb->drawable = 0;
398
399         /* Unreference.  If count = zero we'll really delete the buffer */
400         _mesa_reference_framebuffer(&fb, NULL);
401
402         return;
403      }
404      /* continue search */
405      prev = b;
406   }
407   /* buffer not found in XMesaBufferList */
408   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
409}
410
411
412
413
414/**********************************************************************/
415/*****                   Misc Private Functions                   *****/
416/**********************************************************************/
417
418
419/**
420 * Setup RGB rendering for a window with a True/DirectColor visual.
421 */
422static void
423setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
424{
425   unsigned long rmask, gmask, bmask;
426   (void) buffer;
427   (void) cmap;
428
429   /* Compute red multiplier (mask) and bit shift */
430   v->rshift = 0;
431   rmask = GET_REDMASK(v);
432   while ((rmask & 1)==0) {
433      v->rshift++;
434      rmask = rmask >> 1;
435   }
436
437   /* Compute green multiplier (mask) and bit shift */
438   v->gshift = 0;
439   gmask = GET_GREENMASK(v);
440   while ((gmask & 1)==0) {
441      v->gshift++;
442      gmask = gmask >> 1;
443   }
444
445   /* Compute blue multiplier (mask) and bit shift */
446   v->bshift = 0;
447   bmask = GET_BLUEMASK(v);
448   while ((bmask & 1)==0) {
449      v->bshift++;
450      bmask = bmask >> 1;
451   }
452
453   /*
454    * Compute component-to-pixel lookup tables and dithering kernel
455    */
456   {
457      static GLubyte kernel[16] = {
458          0*16,  8*16,  2*16, 10*16,
459         12*16,  4*16, 14*16,  6*16,
460          3*16, 11*16,  1*16,  9*16,
461         15*16,  7*16, 13*16,  5*16,
462      };
463      GLint rBits = _mesa_bitcount(rmask);
464      GLint gBits = _mesa_bitcount(gmask);
465      GLint bBits = _mesa_bitcount(bmask);
466      GLint maxBits;
467      GLuint i;
468
469      /* convert pixel components in [0,_mask] to RGB values in [0,255] */
470      for (i=0; i<=rmask; i++)
471         v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
472      for (i=0; i<=gmask; i++)
473         v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
474      for (i=0; i<=bmask; i++)
475         v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
476
477      /* convert RGB values from [0,255] to pixel components */
478
479      for (i=0;i<256;i++) {
480         GLint r = gamma_adjust(v->RedGamma,   i, 255);
481         GLint g = gamma_adjust(v->GreenGamma, i, 255);
482         GLint b = gamma_adjust(v->BlueGamma,  i, 255);
483         v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
484         v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
485         v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
486      }
487      /* overflow protection */
488      for (i=256;i<512;i++) {
489         v->RtoPixel[i] = v->RtoPixel[255];
490         v->GtoPixel[i] = v->GtoPixel[255];
491         v->BtoPixel[i] = v->BtoPixel[255];
492      }
493
494      /* setup dithering kernel */
495      maxBits = rBits;
496      if (gBits > maxBits)  maxBits = gBits;
497      if (bBits > maxBits)  maxBits = bBits;
498      for (i=0;i<16;i++) {
499         v->Kernel[i] = kernel[i] >> maxBits;
500      }
501
502      v->undithered_pf = PF_Truecolor;
503      v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
504   }
505
506   /*
507    * Now check for TrueColor visuals which we can optimize.
508    */
509   if (   GET_REDMASK(v)  ==0x0000ff
510       && GET_GREENMASK(v)==0x00ff00
511       && GET_BLUEMASK(v) ==0xff0000
512       && CHECK_BYTE_ORDER(v)
513       && v->BitsPerPixel==32
514       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
515      /* common 32 bpp config used on SGI, Sun */
516      v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
517   }
518   else if (GET_REDMASK(v)  == 0xff0000
519         && GET_GREENMASK(v)== 0x00ff00
520         && GET_BLUEMASK(v) == 0x0000ff
521         && CHECK_BYTE_ORDER(v)
522         && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
523      if (v->BitsPerPixel==32) {
524         /* if 32 bpp, and visual indicates 8 bpp alpha channel */
525         if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
526            v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
527         else
528            v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
529      }
530      else if (v->BitsPerPixel == 24) {
531         v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
532      }
533   }
534   else if (GET_REDMASK(v)  ==0xf800
535       &&   GET_GREENMASK(v)==0x07e0
536       &&   GET_BLUEMASK(v) ==0x001f
537       && CHECK_BYTE_ORDER(v)
538       && v->BitsPerPixel==16
539       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
540      /* 5-6-5 RGB */
541      v->undithered_pf = PF_5R6G5B;
542      v->dithered_pf = PF_Dither_5R6G5B;
543   }
544}
545
546
547/**
548 * When a context is bound for the first time, we can finally finish
549 * initializing the context's visual and buffer information.
550 * \param v  the XMesaVisual to initialize
551 * \param b  the XMesaBuffer to initialize (may be NULL)
552 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
553 * \param window  the window/pixmap we're rendering into
554 * \param cmap  the colormap associated with the window/pixmap
555 * \return GL_TRUE=success, GL_FALSE=failure
556 */
557static GLboolean
558initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
559                             XMesaDrawable window,
560                             XMesaColormap cmap)
561{
562   const int xclass = v->visualType;
563
564
565   ASSERT(!b || b->xm_visual == v);
566
567   /* Save true bits/pixel */
568   v->BitsPerPixel = bits_per_pixel(v);
569   assert(v->BitsPerPixel > 0);
570
571   /* RGB WINDOW:
572    * We support RGB rendering into almost any kind of visual.
573    */
574   if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
575      setup_truecolor( v, b, cmap );
576   }
577   else {
578      _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
579      return GL_FALSE;
580   }
581   v->mesa_visual.indexBits = 0;
582
583   if (_mesa_getenv("MESA_NO_DITHER")) {
584      v->dithered_pf = v->undithered_pf;
585   }
586
587
588   /*
589    * If MESA_INFO env var is set print out some debugging info
590    * which can help Brian figure out what's going on when a user
591    * reports bugs.
592    */
593   if (_mesa_getenv("MESA_INFO")) {
594      printf("X/Mesa visual = %p\n", (void *) v);
595      printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
596      printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
597      printf("X/Mesa level = %d\n", v->mesa_visual.level);
598      printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
599      printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
600   }
601
602   if (b && window) {
603      /* Do window-specific initializations */
604
605      /* these should have been set in create_xmesa_buffer */
606      ASSERT(b->frontxrb->drawable == window);
607      ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
608
609      /* Setup for single/double buffering */
610      if (v->mesa_visual.doubleBufferMode) {
611         /* Double buffered */
612         b->shm = check_for_xshm( v->display );
613      }
614
615      /* X11 graphics contexts */
616      b->gc = XCreateGC( v->display, window, 0, NULL );
617      XMesaSetFunction( v->display, b->gc, GXcopy );
618
619      /* cleargc - for glClear() */
620      b->cleargc = XCreateGC( v->display, window, 0, NULL );
621      XMesaSetFunction( v->display, b->cleargc, GXcopy );
622
623      /*
624       * Don't generate Graphics Expose/NoExpose events in swapbuffers().
625       * Patch contributed by Michael Pichler May 15, 1995.
626       */
627      {
628         XGCValues gcvalues;
629         gcvalues.graphics_exposures = False;
630         b->swapgc = XCreateGC(v->display, window,
631                               GCGraphicsExposures, &gcvalues);
632      }
633      XMesaSetFunction( v->display, b->swapgc, GXcopy );
634   }
635
636   return GL_TRUE;
637}
638
639
640
641/*
642 * Convert an RGBA color to a pixel value.
643 */
644unsigned long
645xmesa_color_to_pixel(struct gl_context *ctx,
646                     GLubyte r, GLubyte g, GLubyte b, GLubyte a,
647                     GLuint pixelFormat)
648{
649   XMesaContext xmesa = XMESA_CONTEXT(ctx);
650   switch (pixelFormat) {
651      case PF_Truecolor:
652         {
653            unsigned long p;
654            PACK_TRUECOLOR( p, r, g, b );
655            return p;
656         }
657      case PF_8A8B8G8R:
658         return PACK_8A8B8G8R( r, g, b, a );
659      case PF_8A8R8G8B:
660         return PACK_8A8R8G8B( r, g, b, a );
661      case PF_8R8G8B:
662         /* fall through */
663      case PF_8R8G8B24:
664         return PACK_8R8G8B( r, g, b );
665      case PF_5R6G5B:
666         return PACK_5R6G5B( r, g, b );
667      case PF_Dither_True:
668         /* fall through */
669      case PF_Dither_5R6G5B:
670         {
671            unsigned long p;
672            PACK_TRUEDITHER(p, 1, 0, r, g, b);
673            return p;
674         }
675      default:
676         _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
677   }
678   return 0;
679}
680
681
682#define NUM_VISUAL_TYPES   6
683
684/**
685 * Convert an X visual type to a GLX visual type.
686 *
687 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
688 *        to be converted.
689 * \return If \c visualType is a valid X visual type, a GLX visual type will
690 *         be returned.  Otherwise \c GLX_NONE will be returned.
691 *
692 * \note
693 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
694 * DRI CVS tree.
695 */
696static GLint
697xmesa_convert_from_x_visual_type( int visualType )
698{
699    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
700	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
701	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
702	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
703    };
704
705    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
706	? glx_visual_types[ visualType ] : GLX_NONE;
707}
708
709
710/**********************************************************************/
711/*****                       Public Functions                     *****/
712/**********************************************************************/
713
714
715/*
716 * Create a new X/Mesa visual.
717 * Input:  display - X11 display
718 *         visinfo - an XVisualInfo pointer
719 *         rgb_flag - GL_TRUE = RGB mode,
720 *                    GL_FALSE = color index mode
721 *         alpha_flag - alpha buffer requested?
722 *         db_flag - GL_TRUE = double-buffered,
723 *                   GL_FALSE = single buffered
724 *         stereo_flag - stereo visual?
725 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
726 *                       GL_FALSE = use an off-screen pixmap for back buffer
727 *         depth_size - requested bits/depth values, or zero
728 *         stencil_size - requested bits/stencil values, or zero
729 *         accum_red_size - requested bits/red accum values, or zero
730 *         accum_green_size - requested bits/green accum values, or zero
731 *         accum_blue_size - requested bits/blue accum values, or zero
732 *         accum_alpha_size - requested bits/alpha accum values, or zero
733 *         num_samples - number of samples/pixel if multisampling, or zero
734 *         level - visual level, usually 0
735 *         visualCaveat - ala the GLX extension, usually GLX_NONE
736 * Return;  a new XMesaVisual or 0 if error.
737 */
738PUBLIC
739XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
740                               XMesaVisualInfo visinfo,
741                               GLboolean rgb_flag,
742                               GLboolean alpha_flag,
743                               GLboolean db_flag,
744                               GLboolean stereo_flag,
745                               GLboolean ximage_flag,
746                               GLint depth_size,
747                               GLint stencil_size,
748                               GLint accum_red_size,
749                               GLint accum_green_size,
750                               GLint accum_blue_size,
751                               GLint accum_alpha_size,
752                               GLint num_samples,
753                               GLint level,
754                               GLint visualCaveat )
755{
756   char *gamma;
757   XMesaVisual v;
758   GLint red_bits, green_bits, blue_bits, alpha_bits;
759
760   /* For debugging only */
761   if (_mesa_getenv("MESA_XSYNC")) {
762      /* This makes debugging X easier.
763       * In your debugger, set a breakpoint on _XError to stop when an
764       * X protocol error is generated.
765       */
766      XSynchronize( display, 1 );
767   }
768
769   /* Color-index rendering not supported. */
770   if (!rgb_flag)
771      return NULL;
772
773   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
774   if (!v) {
775      return NULL;
776   }
777
778   v->display = display;
779
780   /* Save a copy of the XVisualInfo struct because the user may Xfree()
781    * the struct but we may need some of the information contained in it
782    * at a later time.
783    */
784   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
785   if(!v->visinfo) {
786      free(v);
787      return NULL;
788   }
789   memcpy(v->visinfo, visinfo, sizeof(*visinfo));
790
791   /* check for MESA_GAMMA environment variable */
792   gamma = _mesa_getenv("MESA_GAMMA");
793   if (gamma) {
794      v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
795      sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
796      if (v->RedGamma<=0.0)    v->RedGamma = 1.0;
797      if (v->GreenGamma<=0.0)  v->GreenGamma = v->RedGamma;
798      if (v->BlueGamma<=0.0)   v->BlueGamma = v->RedGamma;
799   }
800   else {
801      v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
802   }
803
804   v->ximage_flag = ximage_flag;
805
806   v->mesa_visual.redMask = visinfo->red_mask;
807   v->mesa_visual.greenMask = visinfo->green_mask;
808   v->mesa_visual.blueMask = visinfo->blue_mask;
809   v->visualID = visinfo->visualid;
810   v->screen = visinfo->screen;
811
812#if !(defined(__cplusplus) || defined(c_plusplus))
813   v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
814#else
815   v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
816#endif
817
818   v->mesa_visual.visualRating = visualCaveat;
819
820   if (alpha_flag)
821      v->mesa_visual.alphaBits = 8;
822
823   (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
824
825   {
826      const int xclass = v->visualType;
827      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
828         red_bits   = _mesa_bitcount(GET_REDMASK(v));
829         green_bits = _mesa_bitcount(GET_GREENMASK(v));
830         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
831      }
832      else {
833         /* this is an approximation */
834         int depth;
835         depth = GET_VISUAL_DEPTH(v);
836         red_bits = depth / 3;
837         depth -= red_bits;
838         green_bits = depth / 2;
839         depth -= green_bits;
840         blue_bits = depth;
841         alpha_bits = 0;
842         assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
843      }
844      alpha_bits = v->mesa_visual.alphaBits;
845   }
846
847   _mesa_initialize_visual( &v->mesa_visual,
848                            db_flag, stereo_flag,
849                            red_bits, green_bits,
850                            blue_bits, alpha_bits,
851                            depth_size,
852                            stencil_size,
853                            accum_red_size, accum_green_size,
854                            accum_blue_size, accum_alpha_size,
855                            0 );
856
857   /* XXX minor hack */
858   v->mesa_visual.level = level;
859   return v;
860}
861
862
863PUBLIC
864void XMesaDestroyVisual( XMesaVisual v )
865{
866   free(v->visinfo);
867   free(v);
868}
869
870
871
872/**
873 * Create a new XMesaContext.
874 * \param v  the XMesaVisual
875 * \param share_list  another XMesaContext with which to share display
876 *                    lists or NULL if no sharing is wanted.
877 * \return an XMesaContext or NULL if error.
878 */
879PUBLIC
880XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
881{
882   static GLboolean firstTime = GL_TRUE;
883   XMesaContext c;
884   struct gl_context *mesaCtx;
885   struct dd_function_table functions;
886   TNLcontext *tnl;
887
888   if (firstTime) {
889      _glthread_INIT_MUTEX(_xmesa_lock);
890      firstTime = GL_FALSE;
891   }
892
893   /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
894   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
895   if (!c)
896      return NULL;
897
898   mesaCtx = &(c->mesa);
899
900   /* initialize with default driver functions, then plug in XMesa funcs */
901   _mesa_init_driver_functions(&functions);
902   xmesa_init_driver_functions(v, &functions);
903   if (!_mesa_initialize_context(mesaCtx, API_OPENGL, &v->mesa_visual,
904                      share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
905                      &functions, (void *) c)) {
906      free(c);
907      return NULL;
908   }
909
910   /* Enable this to exercise fixed function -> shader translation
911    * with software rendering.
912    */
913   if (0) {
914      mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
915      mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
916   }
917
918   _mesa_enable_sw_extensions(mesaCtx);
919   _mesa_enable_1_3_extensions(mesaCtx);
920   _mesa_enable_1_4_extensions(mesaCtx);
921   _mesa_enable_1_5_extensions(mesaCtx);
922   _mesa_enable_2_0_extensions(mesaCtx);
923   _mesa_enable_2_1_extensions(mesaCtx);
924    if (mesaCtx->Mesa_DXTn) {
925       _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
926       _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
927    }
928    _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
929#if ENABLE_EXT_timer_query
930    _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
931#endif
932
933
934   /* finish up xmesa context initializations */
935   c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
936   c->xm_visual = v;
937   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
938   c->display = v->display;
939   c->pixelformat = v->dithered_pf;      /* Dithering is enabled by default */
940
941   /* Initialize the software rasterizer and helper modules.
942    */
943   if (!_swrast_CreateContext( mesaCtx ) ||
944       !_vbo_CreateContext( mesaCtx ) ||
945       !_tnl_CreateContext( mesaCtx ) ||
946       !_swsetup_CreateContext( mesaCtx )) {
947      _mesa_free_context_data(&c->mesa);
948      free(c);
949      return NULL;
950   }
951
952   /* tnl setup */
953   tnl = TNL_CONTEXT(mesaCtx);
954   tnl->Driver.RunPipeline = _tnl_run_pipeline;
955   /* swrast setup */
956   xmesa_register_swrast_functions( mesaCtx );
957   _swsetup_Wakeup(mesaCtx);
958
959   _mesa_meta_init(mesaCtx);
960
961   return c;
962}
963
964
965
966PUBLIC
967void XMesaDestroyContext( XMesaContext c )
968{
969   struct gl_context *mesaCtx = &c->mesa;
970
971   _mesa_meta_free( mesaCtx );
972
973   _swsetup_DestroyContext( mesaCtx );
974   _swrast_DestroyContext( mesaCtx );
975   _tnl_DestroyContext( mesaCtx );
976   _vbo_DestroyContext( mesaCtx );
977   _mesa_free_context_data( mesaCtx );
978   free( c );
979}
980
981
982
983/**
984 * Private function for creating an XMesaBuffer which corresponds to an
985 * X window or pixmap.
986 * \param v  the window's XMesaVisual
987 * \param w  the window we're wrapping
988 * \return  new XMesaBuffer or NULL if error
989 */
990PUBLIC XMesaBuffer
991XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
992{
993   XWindowAttributes attr;
994   XMesaBuffer b;
995   XMesaColormap cmap;
996   int depth;
997
998   assert(v);
999   assert(w);
1000
1001   /* Check that window depth matches visual depth */
1002   XGetWindowAttributes( v->display, w, &attr );
1003   depth = attr.depth;
1004   if (GET_VISUAL_DEPTH(v) != depth) {
1005      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1006                    GET_VISUAL_DEPTH(v), depth);
1007      return NULL;
1008   }
1009
1010   /* Find colormap */
1011   if (attr.colormap) {
1012      cmap = attr.colormap;
1013   }
1014   else {
1015      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1016      /* this is weird, a window w/out a colormap!? */
1017      /* OK, let's just allocate a new one and hope for the best */
1018      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1019   }
1020
1021   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1022   if (!b)
1023      return NULL;
1024
1025   if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1026      xmesa_free_buffer(b);
1027      return NULL;
1028   }
1029
1030   return b;
1031}
1032
1033
1034
1035/**
1036 * Create a new XMesaBuffer from an X pixmap.
1037 *
1038 * \param v    the XMesaVisual
1039 * \param p    the pixmap
1040 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1041 *             \c GLX_DIRECT_COLOR visual for the pixmap
1042 * \returns new XMesaBuffer or NULL if error
1043 */
1044PUBLIC XMesaBuffer
1045XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1046{
1047   XMesaBuffer b;
1048
1049   assert(v);
1050
1051   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1052   if (!b)
1053      return NULL;
1054
1055   if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1056      xmesa_free_buffer(b);
1057      return NULL;
1058   }
1059
1060   return b;
1061}
1062
1063
1064/**
1065 * For GLX_EXT_texture_from_pixmap
1066 */
1067XMesaBuffer
1068XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1069                               XMesaColormap cmap,
1070                               int format, int target, int mipmap)
1071{
1072   GET_CURRENT_CONTEXT(ctx);
1073   XMesaBuffer b;
1074   GLuint width, height;
1075
1076   assert(v);
1077
1078   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1079   if (!b)
1080      return NULL;
1081
1082   /* get pixmap size, update framebuffer/renderbuffer dims */
1083   xmesa_get_window_size(v->display, b, &width, &height);
1084   _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1085
1086   if (target == 0) {
1087      /* examine dims */
1088      if (ctx->Extensions.ARB_texture_non_power_of_two) {
1089         target = GLX_TEXTURE_2D_EXT;
1090      }
1091      else if (   _mesa_bitcount(width)  == 1
1092               && _mesa_bitcount(height) == 1) {
1093         /* power of two size */
1094         if (height == 1) {
1095            target = GLX_TEXTURE_1D_EXT;
1096         }
1097         else {
1098            target = GLX_TEXTURE_2D_EXT;
1099         }
1100      }
1101      else if (ctx->Extensions.NV_texture_rectangle) {
1102         target = GLX_TEXTURE_RECTANGLE_EXT;
1103      }
1104      else {
1105         /* non power of two textures not supported */
1106         XMesaDestroyBuffer(b);
1107         return 0;
1108      }
1109   }
1110
1111   b->TextureTarget = target;
1112   b->TextureFormat = format;
1113   b->TextureMipmap = mipmap;
1114
1115   if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1116      xmesa_free_buffer(b);
1117      return NULL;
1118   }
1119
1120   return b;
1121}
1122
1123
1124
1125XMesaBuffer
1126XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1127                   unsigned int width, unsigned int height)
1128{
1129   XMesaWindow root;
1130   XMesaDrawable drawable;  /* X Pixmap Drawable */
1131   XMesaBuffer b;
1132
1133   /* allocate pixmap for front buffer */
1134   root = RootWindow( v->display, v->visinfo->screen );
1135   drawable = XCreatePixmap(v->display, root, width, height,
1136                            v->visinfo->depth);
1137   if (!drawable)
1138      return NULL;
1139
1140   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1141   if (!b)
1142      return NULL;
1143
1144   if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1145      xmesa_free_buffer(b);
1146      return NULL;
1147   }
1148
1149   return b;
1150}
1151
1152
1153
1154/*
1155 * Deallocate an XMesaBuffer structure and all related info.
1156 */
1157PUBLIC void
1158XMesaDestroyBuffer(XMesaBuffer b)
1159{
1160   xmesa_free_buffer(b);
1161}
1162
1163
1164/**
1165 * Query the current window size and update the corresponding struct gl_framebuffer
1166 * and all attached renderbuffers.
1167 * Called when:
1168 *  1. the first time a buffer is bound to a context.
1169 *  2. from glViewport to poll for window size changes
1170 *  3. from the XMesaResizeBuffers() API function.
1171 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1172 * when resizing a buffer when no rendering context is bound.
1173 */
1174void
1175xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1176{
1177   GLuint width, height;
1178   xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1179   if (drawBuffer->mesa_buffer.Width != width ||
1180       drawBuffer->mesa_buffer.Height != height) {
1181      struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1182      _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1183   }
1184   drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1185}
1186
1187
1188/*
1189 * Bind buffer b to context c and make c the current rendering context.
1190 */
1191GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1192{
1193   return XMesaMakeCurrent2( c, b, b );
1194}
1195
1196
1197/*
1198 * Bind buffer b to context c and make c the current rendering context.
1199 */
1200PUBLIC
1201GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1202                             XMesaBuffer readBuffer )
1203{
1204   if (c) {
1205      if (!drawBuffer || !readBuffer)
1206         return GL_FALSE;  /* must specify buffers! */
1207
1208      if (&(c->mesa) == _mesa_get_current_context()
1209          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1210          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1211          && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1212         /* same context and buffer, do nothing */
1213         return GL_TRUE;
1214      }
1215
1216      c->xm_buffer = drawBuffer;
1217
1218      /* Call this periodically to detect when the user has begun using
1219       * GL rendering from multiple threads.
1220       */
1221      _glapi_check_multithread();
1222
1223      xmesa_check_and_update_buffer_size(c, drawBuffer);
1224      if (readBuffer != drawBuffer)
1225         xmesa_check_and_update_buffer_size(c, readBuffer);
1226
1227      _mesa_make_current(&(c->mesa),
1228                         &drawBuffer->mesa_buffer,
1229                         &readBuffer->mesa_buffer);
1230
1231      /*
1232       * Must recompute and set these pixel values because colormap
1233       * can be different for different windows.
1234       */
1235      c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1236					    c->clearcolor[0],
1237					    c->clearcolor[1],
1238					    c->clearcolor[2],
1239					    c->clearcolor[3],
1240					    c->xm_visual->undithered_pf);
1241      XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1242
1243      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1244      drawBuffer->wasCurrent = GL_TRUE;
1245   }
1246   else {
1247      /* Detach */
1248      _mesa_make_current( NULL, NULL, NULL );
1249   }
1250   return GL_TRUE;
1251}
1252
1253
1254/*
1255 * Unbind the context c from its buffer.
1256 */
1257GLboolean XMesaUnbindContext( XMesaContext c )
1258{
1259   /* A no-op for XFree86 integration purposes */
1260   return GL_TRUE;
1261}
1262
1263
1264XMesaContext XMesaGetCurrentContext( void )
1265{
1266   GET_CURRENT_CONTEXT(ctx);
1267   if (ctx) {
1268      XMesaContext xmesa = XMESA_CONTEXT(ctx);
1269      return xmesa;
1270   }
1271   else {
1272      return 0;
1273   }
1274}
1275
1276
1277XMesaBuffer XMesaGetCurrentBuffer( void )
1278{
1279   GET_CURRENT_CONTEXT(ctx);
1280   if (ctx) {
1281      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1282      return xmbuf;
1283   }
1284   else {
1285      return 0;
1286   }
1287}
1288
1289
1290/* New in Mesa 3.1 */
1291XMesaBuffer XMesaGetCurrentReadBuffer( void )
1292{
1293   GET_CURRENT_CONTEXT(ctx);
1294   if (ctx) {
1295      return XMESA_BUFFER(ctx->ReadBuffer);
1296   }
1297   else {
1298      return 0;
1299   }
1300}
1301
1302
1303
1304GLboolean XMesaSetFXmode( GLint mode )
1305{
1306   (void) mode;
1307   return GL_FALSE;
1308}
1309
1310
1311
1312/*
1313 * Copy the back buffer to the front buffer.  If there's no back buffer
1314 * this is a no-op.
1315 */
1316PUBLIC
1317void XMesaSwapBuffers( XMesaBuffer b )
1318{
1319   GET_CURRENT_CONTEXT(ctx);
1320
1321   if (!b->backxrb) {
1322      /* single buffered */
1323      return;
1324   }
1325
1326   /* If we're swapping the buffer associated with the current context
1327    * we have to flush any pending rendering commands first.
1328    */
1329   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1330      _mesa_notifySwapBuffers(ctx);
1331
1332   if (b->db_mode) {
1333      if (b->backxrb->ximage) {
1334	 /* Copy Ximage (back buf) from client memory to server window */
1335#if defined(USE_XSHM)
1336	 if (b->shm) {
1337            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1338	    XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1339			  b->swapgc,
1340			  b->backxrb->ximage, 0, 0,
1341			  0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1342                          False );
1343            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1344	 }
1345	 else
1346#endif
1347         {
1348            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1349            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1350			   b->swapgc,
1351			   b->backxrb->ximage, 0, 0,
1352			   0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1353            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1354         }
1355      }
1356      else if (b->backxrb->pixmap) {
1357	 /* Copy pixmap (back buf) to window (front buf) on server */
1358         /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1359	 XMesaCopyArea( b->xm_visual->display,
1360			b->backxrb->pixmap,   /* source drawable */
1361			b->frontxrb->drawable,  /* dest. drawable */
1362			b->swapgc,
1363			0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1364			0, 0                 /* dest region */
1365		      );
1366         /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1367      }
1368   }
1369   XSync( b->xm_visual->display, False );
1370}
1371
1372
1373
1374/*
1375 * Copy sub-region of back buffer to front buffer
1376 */
1377void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1378{
1379   GET_CURRENT_CONTEXT(ctx);
1380
1381   /* If we're swapping the buffer associated with the current context
1382    * we have to flush any pending rendering commands first.
1383    */
1384   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1385      _mesa_notifySwapBuffers(ctx);
1386
1387   if (!b->backxrb) {
1388      /* single buffered */
1389      return;
1390   }
1391
1392   if (b->db_mode) {
1393      int yTop = b->mesa_buffer.Height - y - height;
1394      if (b->backxrb->ximage) {
1395         /* Copy Ximage from host's memory to server's window */
1396#if defined(USE_XSHM)
1397         if (b->shm) {
1398            /* XXX assuming width and height aren't too large! */
1399            XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1400                          b->swapgc,
1401                          b->backxrb->ximage, x, yTop,
1402                          x, yTop, width, height, False );
1403            /* wait for finished event??? */
1404         }
1405         else
1406#endif
1407         {
1408            /* XXX assuming width and height aren't too large! */
1409            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1410			   b->swapgc,
1411			   b->backxrb->ximage, x, yTop,
1412			   x, yTop, width, height );
1413         }
1414      }
1415      else {
1416         /* Copy pixmap to window on server */
1417         XMesaCopyArea( b->xm_visual->display,
1418			b->backxrb->pixmap,           /* source drawable */
1419			b->frontxrb->drawable,        /* dest. drawable */
1420			b->swapgc,
1421			x, yTop, width, height,  /* source region */
1422			x, yTop                  /* dest region */
1423                      );
1424      }
1425   }
1426}
1427
1428
1429/*
1430 * Return a pointer to the XMesa backbuffer Pixmap or XImage.  This function
1431 * is a way to get "under the hood" of X/Mesa so one can manipulate the
1432 * back buffer directly.
1433 * Output:  pixmap - pointer to back buffer's Pixmap, or 0
1434 *          ximage - pointer to back buffer's XImage, or NULL
1435 * Return:  GL_TRUE = context is double buffered
1436 *          GL_FALSE = context is single buffered
1437 */
1438GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1439                              XMesaPixmap *pixmap,
1440                              XMesaImage **ximage )
1441{
1442   if (b->db_mode) {
1443      if (pixmap)
1444         *pixmap = b->backxrb->pixmap;
1445      if (ximage)
1446         *ximage = b->backxrb->ximage;
1447      return GL_TRUE;
1448   }
1449   else {
1450      *pixmap = 0;
1451      *ximage = NULL;
1452      return GL_FALSE;
1453   }
1454}
1455
1456
1457/*
1458 * Return the depth buffer associated with an XMesaBuffer.
1459 * Input:  b - the XMesa buffer handle
1460 * Output:  width, height - size of buffer in pixels
1461 *          bytesPerValue - bytes per depth value (2 or 4)
1462 *          buffer - pointer to depth buffer values
1463 * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
1464 */
1465GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1466                               GLint *bytesPerValue, void **buffer )
1467{
1468   struct gl_renderbuffer *rb
1469      = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1470   struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1471
1472   if (!xrb || !xrb->Base.Buffer) {
1473      *width = 0;
1474      *height = 0;
1475      *bytesPerValue = 0;
1476      *buffer = 0;
1477      return GL_FALSE;
1478   }
1479   else {
1480      *width = b->mesa_buffer.Width;
1481      *height = b->mesa_buffer.Height;
1482      *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1483         ? sizeof(GLushort) : sizeof(GLuint);
1484      *buffer = (void *) xrb->Base.Buffer;
1485      return GL_TRUE;
1486   }
1487}
1488
1489
1490void XMesaFlush( XMesaContext c )
1491{
1492   if (c && c->xm_visual) {
1493      XSync( c->xm_visual->display, False );
1494   }
1495}
1496
1497
1498
1499const char *XMesaGetString( XMesaContext c, int name )
1500{
1501   (void) c;
1502   if (name==XMESA_VERSION) {
1503      return "5.0";
1504   }
1505   else if (name==XMESA_EXTENSIONS) {
1506      return "";
1507   }
1508   else {
1509      return NULL;
1510   }
1511}
1512
1513
1514
1515XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1516{
1517   XMesaBuffer b;
1518   for (b=XMesaBufferList; b; b=b->Next) {
1519      if (b->frontxrb->drawable == d && b->display == dpy) {
1520         return b;
1521      }
1522   }
1523   return NULL;
1524}
1525
1526
1527/**
1528 * Free/destroy all XMesaBuffers associated with given display.
1529 */
1530void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1531{
1532   XMesaBuffer b, next;
1533   for (b = XMesaBufferList; b; b = next) {
1534      next = b->Next;
1535      if (b->display == dpy) {
1536         xmesa_free_buffer(b);
1537      }
1538   }
1539}
1540
1541
1542/*
1543 * Look for XMesaBuffers whose X window has been destroyed.
1544 * Deallocate any such XMesaBuffers.
1545 */
1546void XMesaGarbageCollect( XMesaDisplay* dpy )
1547{
1548   XMesaBuffer b, next;
1549   for (b=XMesaBufferList; b; b=next) {
1550      next = b->Next;
1551      if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1552         XSync(b->display, False);
1553         if (!window_exists( b->display, b->frontxrb->drawable )) {
1554            /* found a dead window, free the ancillary info */
1555            XMesaDestroyBuffer( b );
1556         }
1557      }
1558   }
1559}
1560
1561
1562unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1563                                GLfloat red, GLfloat green,
1564                                GLfloat blue, GLfloat alpha )
1565{
1566   GLint r = (GLint) (red   * 255.0F);
1567   GLint g = (GLint) (green * 255.0F);
1568   GLint b = (GLint) (blue  * 255.0F);
1569   GLint a = (GLint) (alpha * 255.0F);
1570
1571   switch (xmesa->pixelformat) {
1572      case PF_Truecolor:
1573         {
1574            unsigned long p;
1575            PACK_TRUECOLOR( p, r, g, b );
1576            return p;
1577         }
1578      case PF_8A8B8G8R:
1579         return PACK_8A8B8G8R( r, g, b, a );
1580      case PF_8A8R8G8B:
1581         return PACK_8A8R8G8B( r, g, b, a );
1582      case PF_8R8G8B:
1583         return PACK_8R8G8B( r, g, b );
1584      case PF_5R6G5B:
1585         return PACK_5R6G5B( r, g, b );
1586      case PF_Dither_5R6G5B:
1587         /* fall through */
1588      case PF_Dither_True:
1589         {
1590            unsigned long p;
1591            PACK_TRUEDITHER(p, x, y, r, g, b);
1592            return p;
1593         }
1594      default:
1595         _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1596   }
1597   return 0;
1598}
1599
1600
1601/*
1602 * This is typically called when the window size changes and we need
1603 * to reallocate the buffer's back/depth/stencil/accum buffers.
1604 */
1605PUBLIC void
1606XMesaResizeBuffers( XMesaBuffer b )
1607{
1608   GET_CURRENT_CONTEXT(ctx);
1609   XMesaContext xmctx = XMESA_CONTEXT(ctx);
1610   if (!xmctx)
1611      return;
1612   xmesa_check_and_update_buffer_size(xmctx, b);
1613}
1614
1615
1616static GLint
1617xbuffer_to_renderbuffer(int buffer)
1618{
1619   assert(MAX_AUX_BUFFERS <= 4);
1620
1621   switch (buffer) {
1622   case GLX_FRONT_LEFT_EXT:
1623      return BUFFER_FRONT_LEFT;
1624   case GLX_FRONT_RIGHT_EXT:
1625      return BUFFER_FRONT_RIGHT;
1626   case GLX_BACK_LEFT_EXT:
1627      return BUFFER_BACK_LEFT;
1628   case GLX_BACK_RIGHT_EXT:
1629      return BUFFER_BACK_RIGHT;
1630   case GLX_AUX0_EXT:
1631      return BUFFER_AUX0;
1632   case GLX_AUX1_EXT:
1633   case GLX_AUX2_EXT:
1634   case GLX_AUX3_EXT:
1635   case GLX_AUX4_EXT:
1636   case GLX_AUX5_EXT:
1637   case GLX_AUX6_EXT:
1638   case GLX_AUX7_EXT:
1639   case GLX_AUX8_EXT:
1640   case GLX_AUX9_EXT:
1641   default:
1642      /* BadValue error */
1643      return -1;
1644   }
1645}
1646
1647
1648PUBLIC void
1649XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1650                  const int *attrib_list)
1651{
1652#if 0
1653   GET_CURRENT_CONTEXT(ctx);
1654   const GLuint unit = ctx->Texture.CurrentUnit;
1655   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1656   struct gl_texture_object *texObj;
1657#endif
1658   struct gl_renderbuffer *rb;
1659   struct xmesa_renderbuffer *xrb;
1660   GLint b;
1661   XMesaImage *img = NULL;
1662   GLboolean freeImg = GL_FALSE;
1663
1664   b = xbuffer_to_renderbuffer(buffer);
1665   if (b < 0)
1666      return;
1667
1668   if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1669      return; /* BadMatch error */
1670
1671   rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1672   if (!rb) {
1673      /* invalid buffer */
1674      return;
1675   }
1676   xrb = xmesa_renderbuffer(rb);
1677
1678#if 0
1679   switch (drawable->TextureTarget) {
1680   case GLX_TEXTURE_1D_EXT:
1681      texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1682      break;
1683   case GLX_TEXTURE_2D_EXT:
1684      texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1685      break;
1686   case GLX_TEXTURE_RECTANGLE_EXT:
1687      texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1688      break;
1689   default:
1690      return; /* BadMatch error */
1691   }
1692#endif
1693
1694   /*
1695    * The following is a quick and simple way to implement
1696    * BindTexImage.  The better way is to write some new FetchTexel()
1697    * functions which would extract texels from XImages.  We'd still
1698    * need to use GetImage when texturing from a Pixmap (front buffer)
1699    * but texturing from a back buffer (XImage) would avoid an image
1700    * copy.
1701    */
1702
1703   /* get XImage */
1704   if (xrb->pixmap) {
1705      img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1706			  ZPixmap);
1707      freeImg = GL_TRUE;
1708   }
1709   else if (xrb->ximage) {
1710      img = xrb->ximage;
1711   }
1712
1713   /* store the XImage as a new texture image */
1714   if (img) {
1715      GLenum format, type, intFormat;
1716      if (img->bits_per_pixel == 32) {
1717         format = GL_BGRA;
1718         type = GL_UNSIGNED_BYTE;
1719         intFormat = GL_RGBA;
1720      }
1721      else if (img->bits_per_pixel == 24) {
1722         format = GL_BGR;
1723         type = GL_UNSIGNED_BYTE;
1724         intFormat = GL_RGB;
1725      }
1726      else if (img->bits_per_pixel == 16) {
1727         format = GL_BGR;
1728         type = GL_UNSIGNED_SHORT_5_6_5;
1729         intFormat = GL_RGB;
1730      }
1731      else {
1732         _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1733         return;
1734      }
1735      if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1736         intFormat = GL_RGBA;
1737      }
1738      else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1739         intFormat = GL_RGB;
1740      }
1741
1742      _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1743                       format, type, img->data);
1744
1745      if (freeImg) {
1746	 XMesaDestroyImage(img);
1747      }
1748   }
1749}
1750
1751
1752
1753PUBLIC void
1754XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1755{
1756   const GLint b = xbuffer_to_renderbuffer(buffer);
1757   if (b < 0)
1758      return;
1759
1760   /* no-op for now */
1761}
1762
1763