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Merge branch 'master' of git+ssh://brianp@git.freedesktop.org/git/mesa/mesa
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5.2
4 *
5 * Copyright (C) 1999-2006 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 "GL/xmesa.h"
67 #include "xmesaP.h"
68 #include "context.h"
69 #include "extensions.h"
70 #include "framebuffer.h"
71 #include "glthread.h"
72 #include "imports.h"
73 #include "macros.h"
74 #include "renderbuffer.h"
75 #include "swrast/swrast.h"
76 #include "swrast_setup/swrast_setup.h"
77 #include "vbo/vbo.h"
78 #include "tnl/tnl.h"
79 #include "tnl/t_context.h"
80 #include "tnl/t_pipeline.h"
81 #include "drivers/common/driverfuncs.h"
82
83 #ifdef XFree86Server
84 #include <GL/glxtokens.h>
85 #endif
86
87 /**
88 * Global X driver lock
89 */
90 _glthread_Mutex _xmesa_lock;
91
92
93
94 /**
95 * Lookup tables for HPCR pixel format:
96 */
97 static short hpcr_rgbTbl[3][256] = {
98 {
99 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
100 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
101 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
102 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
103 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
104 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
105 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
106 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
107 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
108 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
109 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
110 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
111 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
112 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
113 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
114 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
115 },
116 {
117 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
118 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
119 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
120 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
121 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
122 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
123 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
124 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
125 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
126 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
127 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
128 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
129 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
130 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
131 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
132 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
133 },
134 {
135 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
136 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
137 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
138 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
139 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
140 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
141 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
142 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
143 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
144 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
145 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
146 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
147 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
148 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
149 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
150 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
151 }
152 };
153
154
155
156 /**********************************************************************/
157 /***** X Utility Functions *****/
158 /**********************************************************************/
159
160
161 /**
162 * Return the host's byte order as LSBFirst or MSBFirst ala X.
163 */
164 #ifndef XFree86Server
165 static int host_byte_order( void )
166 {
167 int i = 1;
168 char *cptr = (char *) &i;
169 return (*cptr==1) ? LSBFirst : MSBFirst;
170 }
171 #endif
172
173
174 /**
175 * Check if the X Shared Memory extension is available.
176 * Return: 0 = not available
177 * 1 = shared XImage support available
178 * 2 = shared Pixmap support available also
179 */
180 static int check_for_xshm( XMesaDisplay *display )
181 {
182 #if defined(XFree86Server)
183 return 0;
184 #elif defined(USE_XSHM)
185 int major, minor, ignore;
186 Bool pixmaps;
187
188 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
189 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
190 return (pixmaps==True) ? 2 : 1;
191 }
192 else {
193 return 0;
194 }
195 }
196 else {
197 return 0;
198 }
199 #else
200 /* No XSHM support */
201 return 0;
202 #endif
203 }
204
205
206 /**
207 * Apply gamma correction to an intensity value in [0..max]. Return the
208 * new intensity value.
209 */
210 static GLint
211 gamma_adjust( GLfloat gamma, GLint value, GLint max )
212 {
213 if (gamma == 1.0) {
214 return value;
215 }
216 else {
217 double x = (double) value / (double) max;
218 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
219 }
220 }
221
222
223
224 /**
225 * Return the true number of bits per pixel for XImages.
226 * For example, if we request a 24-bit deep visual we may actually need/get
227 * 32bpp XImages. This function returns the appropriate bpp.
228 * Input: dpy - the X display
229 * visinfo - desribes the visual to be used for XImages
230 * Return: true number of bits per pixel for XImages
231 */
232 static int
233 bits_per_pixel( XMesaVisual xmv )
234 {
235 #ifdef XFree86Server
236 const int depth = xmv->nplanes;
237 int i;
238 assert(depth > 0);
239 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
240 if (screenInfo.formats[i].depth == depth)
241 return screenInfo.formats[i].bitsPerPixel;
242 }
243 return depth; /* should never get here, but this should be safe */
244 #else
245 XMesaDisplay *dpy = xmv->display;
246 XMesaVisualInfo visinfo = xmv->visinfo;
247 XMesaImage *img;
248 int bitsPerPixel;
249 /* Create a temporary XImage */
250 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
251 ZPixmap, 0, /*format, offset*/
252 (char*) MALLOC(8), /*data*/
253 1, 1, /*width, height*/
254 32, /*bitmap_pad*/
255 0 /*bytes_per_line*/
256 );
257 assert(img);
258 /* grab the bits/pixel value */
259 bitsPerPixel = img->bits_per_pixel;
260 /* free the XImage */
261 _mesa_free( img->data );
262 img->data = NULL;
263 XMesaDestroyImage( img );
264 return bitsPerPixel;
265 #endif
266 }
267
268
269
270 /*
271 * Determine if a given X window ID is valid (window exists).
272 * Do this by calling XGetWindowAttributes() for the window and
273 * checking if we catch an X error.
274 * Input: dpy - the display
275 * win - the window to check for existance
276 * Return: GL_TRUE - window exists
277 * GL_FALSE - window doesn't exist
278 */
279 #ifndef XFree86Server
280 static GLboolean WindowExistsFlag;
281
282 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
283 {
284 (void) dpy;
285 if (xerr->error_code == BadWindow) {
286 WindowExistsFlag = GL_FALSE;
287 }
288 return 0;
289 }
290
291 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
292 {
293 XWindowAttributes wa;
294 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
295 WindowExistsFlag = GL_TRUE;
296 old_handler = XSetErrorHandler(window_exists_err_handler);
297 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
298 XSetErrorHandler(old_handler);
299 return WindowExistsFlag;
300 }
301 #endif
302
303
304
305 /**
306 * Return the size of the window (or pixmap) that corresponds to the
307 * given XMesaBuffer.
308 * \param width returns width in pixels
309 * \param height returns height in pixels
310 */
311 void
312 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
313 GLuint *width, GLuint *height)
314 {
315 #ifdef XFree86Server
316 *width = MIN2(b->frontxrb->drawable->width, MAX_WIDTH);
317 *height = MIN2(b->frontxrb->drawable->height, MAX_HEIGHT);
318 #else
319 Window root;
320 Status stat;
321 int xpos, ypos;
322 unsigned int w, h, bw, depth;
323
324 _glthread_LOCK_MUTEX(_xmesa_lock);
325 XSync(b->xm_visual->display, 0); /* added for Chromium */
326 stat = XGetGeometry(dpy, b->frontxrb->pixmap, &root, &xpos, &ypos,
327 &w, &h, &bw, &depth);
328 _glthread_UNLOCK_MUTEX(_xmesa_lock);
329
330 if (stat) {
331 *width = w;
332 *height = h;
333 }
334 else {
335 /* probably querying a window that's recently been destroyed */
336 _mesa_warning(NULL, "XGetGeometry failed!\n");
337 *width = *height = 1;
338 }
339 #endif
340 }
341
342
343
344 /**********************************************************************/
345 /***** Linked list of XMesaBuffers *****/
346 /**********************************************************************/
347
348 XMesaBuffer XMesaBufferList = NULL;
349
350
351 /**
352 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
353 * Note that XMesaBuffer is derived from GLframebuffer.
354 * The new XMesaBuffer will not have any size (Width=Height=0).
355 *
356 * \param d the corresponding X drawable (window or pixmap)
357 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
358 * \param vis the buffer's visual
359 * \param cmap the window's colormap, if known.
360 * \return new XMesaBuffer or NULL if any problem
361 */
362 static XMesaBuffer
363 create_xmesa_buffer(XMesaDrawable d, BufferType type,
364 XMesaVisual vis, XMesaColormap cmap)
365 {
366 GLboolean swAlpha;
367 XMesaBuffer b;
368
369 ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
370
371 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
372 if (!b)
373 return NULL;
374
375 b->display = vis->display;
376 b->xm_visual = vis;
377 b->type = type;
378 b->cmap = cmap;
379
380 _mesa_initialize_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
381 b->mesa_buffer.Delete = xmesa_delete_framebuffer;
382
383 /*
384 * Front renderbuffer
385 */
386 b->frontxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_FALSE);
387 if (!b->frontxrb) {
388 _mesa_free(b);
389 return NULL;
390 }
391 b->frontxrb->Parent = b;
392 b->frontxrb->drawable = d;
393 b->frontxrb->pixmap = (XMesaPixmap) d;
394 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
395 &b->frontxrb->Base);
396
397 /*
398 * Back renderbuffer
399 */
400 if (vis->mesa_visual.doubleBufferMode) {
401 b->backxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual, GL_TRUE);
402 if (!b->backxrb) {
403 /* XXX free front xrb too */
404 _mesa_free(b);
405 return NULL;
406 }
407 b->backxrb->Parent = b;
408 /* determine back buffer implementation */
409 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
410
411 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
412 &b->backxrb->Base);
413 }
414
415 /*
416 * Software alpha planes
417 */
418 if (vis->mesa_visual.alphaBits > 0
419 && vis->undithered_pf != PF_8A8B8G8R
420 && vis->undithered_pf != PF_8A8R8G8B) {
421 /* Visual has alpha, but pixel format doesn't support it.
422 * We'll use an alpha renderbuffer wrapper.
423 */
424 swAlpha = GL_TRUE;
425 }
426 else {
427 swAlpha = GL_FALSE;
428 }
429
430 /*
431 * Other renderbuffer (depth, stencil, etc)
432 */
433 _mesa_add_soft_renderbuffers(&b->mesa_buffer,
434 GL_FALSE, /* color */
435 vis->mesa_visual.haveDepthBuffer,
436 vis->mesa_visual.haveStencilBuffer,
437 vis->mesa_visual.haveAccumBuffer,
438 swAlpha,
439 vis->mesa_visual.numAuxBuffers > 0 );
440
441 /* insert buffer into linked list */
442 b->Next = XMesaBufferList;
443 XMesaBufferList = b;
444
445 return b;
446 }
447
448
449 /**
450 * Find an XMesaBuffer by matching X display and colormap but NOT matching
451 * the notThis buffer.
452 */
453 XMesaBuffer
454 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
455 {
456 XMesaBuffer b;
457 for (b=XMesaBufferList; b; b=b->Next) {
458 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
459 return b;
460 }
461 }
462 return NULL;
463 }
464
465
466 /**
467 * Remove buffer from linked list, delete if no longer referenced.
468 */
469 static void
470 xmesa_free_buffer(XMesaBuffer buffer)
471 {
472 XMesaBuffer prev = NULL, b;
473
474 for (b = XMesaBufferList; b; b = b->Next) {
475 if (b == buffer) {
476 struct gl_framebuffer *fb = &buffer->mesa_buffer;
477
478 /* unlink buffer from list */
479 if (prev)
480 prev->Next = buffer->Next;
481 else
482 XMesaBufferList = buffer->Next;
483
484 /* mark as delete pending */
485 fb->DeletePending = GL_TRUE;
486 /* Unreference. If count = zero we'll really delete the buffer */
487 _mesa_unreference_framebuffer(&fb);
488
489 return;
490 }
491 /* continue search */
492 prev = b;
493 }
494 /* buffer not found in XMesaBufferList */
495 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
496 }
497
498
499 /**
500 * Copy X color table stuff from one XMesaBuffer to another.
501 */
502 static void
503 copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
504 {
505 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
506 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
507 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
508 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
509 dst->num_alloced = src->num_alloced;
510 MEMCPY(dst->alloced_colors, src->alloced_colors,
511 sizeof(src->alloced_colors));
512 }
513
514
515
516 /**********************************************************************/
517 /***** Misc Private Functions *****/
518 /**********************************************************************/
519
520
521 /**
522 * A replacement for XAllocColor. This function should never
523 * fail to allocate a color. When XAllocColor fails, we return
524 * the nearest matching color. If we have to allocate many colors
525 * this function isn't too efficient; the XQueryColors() could be
526 * done just once.
527 * Written by Michael Pichler, Brian Paul, Mark Kilgard
528 * Input: dpy - X display
529 * cmap - X colormap
530 * cmapSize - size of colormap
531 * In/Out: color - the XColor struct
532 * Output: exact - 1=exact color match, 0=closest match
533 * alloced - 1=XAlloc worked, 0=XAlloc failed
534 */
535 static void
536 noFaultXAllocColor( int client,
537 XMesaDisplay *dpy,
538 XMesaColormap cmap,
539 int cmapSize,
540 XMesaColor *color,
541 int *exact, int *alloced )
542 {
543 #ifdef XFree86Server
544 Pixel *ppixIn;
545 xrgb *ctable;
546 #else
547 /* we'll try to cache ctable for better remote display performance */
548 static Display *prevDisplay = NULL;
549 static XMesaColormap prevCmap = 0;
550 static int prevCmapSize = 0;
551 static XMesaColor *ctable = NULL;
552 #endif
553 XMesaColor subColor;
554 int i, bestmatch;
555 double mindist; /* 3*2^16^2 exceeds long int precision. */
556
557 (void) client;
558
559 /* First try just using XAllocColor. */
560 #ifdef XFree86Server
561 if (AllocColor(cmap,
562 &color->red, &color->green, &color->blue,
563 &color->pixel,
564 client) == Success)
565 #else
566 if (XAllocColor(dpy, cmap, color))
567 #endif
568 {
569 *exact = 1;
570 *alloced = 1;
571 return;
572 }
573
574 /* Alloc failed, search for closest match */
575
576 /* Retrieve color table entries. */
577 /* XXX alloca candidate. */
578 #ifdef XFree86Server
579 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
580 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
581 for (i = 0; i < cmapSize; i++) {
582 ppixIn[i] = i;
583 }
584 QueryColors(cmap, cmapSize, ppixIn, ctable);
585 #else
586 if (prevDisplay != dpy || prevCmap != cmap
587 || prevCmapSize != cmapSize || !ctable) {
588 /* free previously cached color table */
589 if (ctable)
590 _mesa_free(ctable);
591 /* Get the color table from X */
592 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
593 assert(ctable);
594 for (i = 0; i < cmapSize; i++) {
595 ctable[i].pixel = i;
596 }
597 XQueryColors(dpy, cmap, ctable, cmapSize);
598 prevDisplay = dpy;
599 prevCmap = cmap;
600 prevCmapSize = cmapSize;
601 }
602 #endif
603
604 /* Find best match. */
605 bestmatch = -1;
606 mindist = 0.0;
607 for (i = 0; i < cmapSize; i++) {
608 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
609 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
610 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
611 double dist = dr * dr + dg * dg + db * db;
612 if (bestmatch < 0 || dist < mindist) {
613 bestmatch = i;
614 mindist = dist;
615 }
616 }
617
618 /* Return result. */
619 subColor.red = ctable[bestmatch].red;
620 subColor.green = ctable[bestmatch].green;
621 subColor.blue = ctable[bestmatch].blue;
622 /* Try to allocate the closest match color. This should only
623 * fail if the cell is read/write. Otherwise, we're incrementing
624 * the cell's reference count.
625 */
626 #ifdef XFree86Server
627 if (AllocColor(cmap,
628 &subColor.red, &subColor.green, &subColor.blue,
629 &subColor.pixel,
630 client) == Success) {
631 #else
632 if (XAllocColor(dpy, cmap, &subColor)) {
633 #endif
634 *alloced = 1;
635 }
636 else {
637 /* do this to work around a problem reported by Frank Ortega */
638 subColor.pixel = (unsigned long) bestmatch;
639 subColor.red = ctable[bestmatch].red;
640 subColor.green = ctable[bestmatch].green;
641 subColor.blue = ctable[bestmatch].blue;
642 subColor.flags = DoRed | DoGreen | DoBlue;
643 *alloced = 0;
644 }
645 #ifdef XFree86Server
646 _mesa_free(ppixIn);
647 _mesa_free(ctable);
648 #else
649 /* don't free table, save it for next time */
650 #endif
651
652 *color = subColor;
653 *exact = 0;
654 }
655
656
657
658 /**
659 * Do setup for PF_GRAYSCALE pixel format.
660 * Note that buffer may be NULL.
661 */
662 static GLboolean
663 setup_grayscale(int client, XMesaVisual v,
664 XMesaBuffer buffer, XMesaColormap cmap)
665 {
666 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
667 return GL_FALSE;
668 }
669
670 if (buffer) {
671 XMesaBuffer prevBuffer;
672
673 if (!cmap) {
674 return GL_FALSE;
675 }
676
677 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
678 if (prevBuffer &&
679 (buffer->xm_visual->mesa_visual.rgbMode ==
680 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
681 /* Copy colormap stuff from previous XMesaBuffer which uses same
682 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
683 */
684 copy_colortable_info(buffer, prevBuffer);
685 }
686 else {
687 /* Allocate 256 shades of gray */
688 int gray;
689 int colorsfailed = 0;
690 for (gray=0;gray<256;gray++) {
691 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
692 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
693 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
694 int exact, alloced;
695 XMesaColor xcol;
696 xcol.red = (r << 8) | r;
697 xcol.green = (g << 8) | g;
698 xcol.blue = (b << 8) | b;
699 noFaultXAllocColor( client, v->display,
700 cmap, GET_COLORMAP_SIZE(v),
701 &xcol, &exact, &alloced );
702 if (!exact) {
703 colorsfailed++;
704 }
705 if (alloced) {
706 assert(buffer->num_alloced<256);
707 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
708 buffer->num_alloced++;
709 }
710
711 /*OLD
712 assert(gray < 576);
713 buffer->color_table[gray*3+0] = xcol.pixel;
714 buffer->color_table[gray*3+1] = xcol.pixel;
715 buffer->color_table[gray*3+2] = xcol.pixel;
716 assert(xcol.pixel < 65536);
717 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
718 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
719 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
720 */
721 buffer->color_table[gray] = xcol.pixel;
722 assert(xcol.pixel < 65536);
723 buffer->pixel_to_r[xcol.pixel] = gray;
724 buffer->pixel_to_g[xcol.pixel] = gray;
725 buffer->pixel_to_b[xcol.pixel] = gray;
726 }
727
728 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
729 _mesa_warning(NULL,
730 "Note: %d out of 256 needed colors do not match exactly.\n",
731 colorsfailed );
732 }
733 }
734 }
735
736 v->dithered_pf = PF_Grayscale;
737 v->undithered_pf = PF_Grayscale;
738 return GL_TRUE;
739 }
740
741
742
743 /**
744 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
745 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
746 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
747 * color. While this function was originally designed just for 8-bit
748 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
749 * Dithering code contributed by Bob Mercier.
750 */
751 static GLboolean
752 setup_dithered_color(int client, XMesaVisual v,
753 XMesaBuffer buffer, XMesaColormap cmap)
754 {
755 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
756 return GL_FALSE;
757 }
758
759 if (buffer) {
760 XMesaBuffer prevBuffer;
761
762 if (!cmap) {
763 return GL_FALSE;
764 }
765
766 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
767 if (prevBuffer &&
768 (buffer->xm_visual->mesa_visual.rgbMode ==
769 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
770 /* Copy colormap stuff from previous, matching XMesaBuffer.
771 * Do this to avoid time spent in noFaultXAllocColor.
772 */
773 copy_colortable_info(buffer, prevBuffer);
774 }
775 else {
776 /* Allocate X colors and initialize color_table[], red_table[], etc */
777 int r, g, b, i;
778 int colorsfailed = 0;
779 for (r = 0; r < DITH_R; r++) {
780 for (g = 0; g < DITH_G; g++) {
781 for (b = 0; b < DITH_B; b++) {
782 XMesaColor xcol;
783 int exact, alloced;
784 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
785 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
786 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
787 noFaultXAllocColor( client, v->display,
788 cmap, GET_COLORMAP_SIZE(v),
789 &xcol, &exact, &alloced );
790 if (!exact) {
791 colorsfailed++;
792 }
793 if (alloced) {
794 assert(buffer->num_alloced<256);
795 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
796 buffer->num_alloced++;
797 }
798 i = DITH_MIX( r, g, b );
799 assert(i < 576);
800 buffer->color_table[i] = xcol.pixel;
801 assert(xcol.pixel < 65536);
802 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
803 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
804 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
805 }
806 }
807 }
808
809 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
810 _mesa_warning(NULL,
811 "Note: %d out of %d needed colors do not match exactly.\n",
812 colorsfailed, DITH_R * DITH_G * DITH_B );
813 }
814 }
815 }
816
817 v->dithered_pf = PF_Dither;
818 v->undithered_pf = PF_Lookup;
819 return GL_TRUE;
820 }
821
822
823 /**
824 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
825 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
826 * Special dithering tables have to be initialized.
827 */
828 static void
829 setup_8bit_hpcr(XMesaVisual v)
830 {
831 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
832 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
833 * on the root window AND the colormap obtainable by XGetRGBColormaps
834 * for that atom must be set on the window. (see also tkInitWindow)
835 * If that colormap is not set, the output will look stripy.
836 */
837
838 /* Setup color tables with gamma correction */
839 int i;
840 double g;
841
842 g = 1.0 / v->RedGamma;
843 for (i=0; i<256; i++) {
844 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
845 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
846 }
847
848 g = 1.0 / v->GreenGamma;
849 for (i=0; i<256; i++) {
850 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
851 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
852 }
853
854 g = 1.0 / v->BlueGamma;
855 for (i=0; i<256; i++) {
856 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
857 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
858 }
859 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
860 v->dithered_pf = PF_HPCR;
861
862 /* which method should I use to clear */
863 /* GL_FALSE: keep the ordinary method */
864 /* GL_TRUE : clear with dither pattern */
865 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
866
867 if (v->hpcr_clear_flag) {
868 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
869 DefaultRootWindow(v->display),
870 16, 2, 8);
871 #ifndef XFree86Server
872 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
873 0, 0, 16, 2, AllPlanes, ZPixmap);
874 #endif
875 }
876 }
877
878
879 /**
880 * Setup RGB rendering for a window with a True/DirectColor visual.
881 */
882 static void
883 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
884 {
885 unsigned long rmask, gmask, bmask;
886 (void) buffer;
887 (void) cmap;
888
889 /* Compute red multiplier (mask) and bit shift */
890 v->rshift = 0;
891 rmask = GET_REDMASK(v);
892 while ((rmask & 1)==0) {
893 v->rshift++;
894 rmask = rmask >> 1;
895 }
896
897 /* Compute green multiplier (mask) and bit shift */
898 v->gshift = 0;
899 gmask = GET_GREENMASK(v);
900 while ((gmask & 1)==0) {
901 v->gshift++;
902 gmask = gmask >> 1;
903 }
904
905 /* Compute blue multiplier (mask) and bit shift */
906 v->bshift = 0;
907 bmask = GET_BLUEMASK(v);
908 while ((bmask & 1)==0) {
909 v->bshift++;
910 bmask = bmask >> 1;
911 }
912
913 /*
914 * Compute component-to-pixel lookup tables and dithering kernel
915 */
916 {
917 static GLubyte kernel[16] = {
918 0*16, 8*16, 2*16, 10*16,
919 12*16, 4*16, 14*16, 6*16,
920 3*16, 11*16, 1*16, 9*16,
921 15*16, 7*16, 13*16, 5*16,
922 };
923 GLint rBits = _mesa_bitcount(rmask);
924 GLint gBits = _mesa_bitcount(gmask);
925 GLint bBits = _mesa_bitcount(bmask);
926 GLint maxBits;
927 GLuint i;
928
929 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
930 for (i=0; i<=rmask; i++)
931 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
932 for (i=0; i<=gmask; i++)
933 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
934 for (i=0; i<=bmask; i++)
935 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
936
937 /* convert RGB values from [0,255] to pixel components */
938
939 for (i=0;i<256;i++) {
940 GLint r = gamma_adjust(v->RedGamma, i, 255);
941 GLint g = gamma_adjust(v->GreenGamma, i, 255);
942 GLint b = gamma_adjust(v->BlueGamma, i, 255);
943 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
944 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
945 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
946 }
947 /* overflow protection */
948 for (i=256;i<512;i++) {
949 v->RtoPixel[i] = v->RtoPixel[255];
950 v->GtoPixel[i] = v->GtoPixel[255];
951 v->BtoPixel[i] = v->BtoPixel[255];
952 }
953
954 /* setup dithering kernel */
955 maxBits = rBits;
956 if (gBits > maxBits) maxBits = gBits;
957 if (bBits > maxBits) maxBits = bBits;
958 for (i=0;i<16;i++) {
959 v->Kernel[i] = kernel[i] >> maxBits;
960 }
961
962 v->undithered_pf = PF_Truecolor;
963 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
964 }
965
966 /*
967 * Now check for TrueColor visuals which we can optimize.
968 */
969 if ( GET_REDMASK(v) ==0x0000ff
970 && GET_GREENMASK(v)==0x00ff00
971 && GET_BLUEMASK(v) ==0xff0000
972 && CHECK_BYTE_ORDER(v)
973 && v->BitsPerPixel==32
974 && sizeof(GLuint)==4
975 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
976 /* common 32 bpp config used on SGI, Sun */
977 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
978 }
979 else if (GET_REDMASK(v) ==0xff0000
980 && GET_GREENMASK(v)==0x00ff00
981 && GET_BLUEMASK(v) ==0x0000ff
982 && CHECK_BYTE_ORDER(v)
983 && v->BitsPerPixel==32
984 && sizeof(GLuint)==4
985 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
986 /* common 32 bpp config used on Linux, HP, IBM */
987 if (GET_VISUAL_DEPTH(v)==32)
988 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B;
989 else
990 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
991 }
992 else if (GET_REDMASK(v) ==0xff0000
993 && GET_GREENMASK(v)==0x00ff00
994 && GET_BLUEMASK(v) ==0x0000ff
995 && CHECK_BYTE_ORDER(v)
996 && v->BitsPerPixel==24
997 && sizeof(GLuint)==4
998 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
999 /* common packed 24 bpp config used on Linux */
1000 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1001 }
1002 else if (GET_REDMASK(v) ==0xf800
1003 && GET_GREENMASK(v)==0x07e0
1004 && GET_BLUEMASK(v) ==0x001f
1005 && CHECK_BYTE_ORDER(v)
1006 && v->BitsPerPixel==16
1007 && sizeof(GLushort)==2
1008 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1009 /* 5-6-5 color weight on common PC VGA boards */
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 setup_8bit_hpcr( v );
1018 }
1019 }
1020
1021
1022
1023 /**
1024 * Setup RGB rendering for a window with a monochrome visual.
1025 */
1026 static void
1027 setup_monochrome( XMesaVisual v, XMesaBuffer b )
1028 {
1029 (void) b;
1030 v->dithered_pf = v->undithered_pf = PF_1Bit;
1031 /* if black=1 then we must flip pixel values */
1032 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1033 }
1034
1035
1036
1037 /**
1038 * When a context is bound for the first time, we can finally finish
1039 * initializing the context's visual and buffer information.
1040 * \param v the XMesaVisual to initialize
1041 * \param b the XMesaBuffer to initialize (may be NULL)
1042 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
1043 * \param window the window/pixmap we're rendering into
1044 * \param cmap the colormap associated with the window/pixmap
1045 * \return GL_TRUE=success, GL_FALSE=failure
1046 */
1047 static GLboolean
1048 initialize_visual_and_buffer(int client, XMesaVisual v, XMesaBuffer b,
1049 GLboolean rgb_flag, XMesaDrawable window,
1050 XMesaColormap cmap)
1051 {
1052 ASSERT(!b || b->xm_visual == v);
1053
1054 /* Save true bits/pixel */
1055 v->BitsPerPixel = bits_per_pixel(v);
1056 assert(v->BitsPerPixel > 0);
1057
1058 if (rgb_flag == GL_FALSE) {
1059 /* COLOR-INDEXED WINDOW:
1060 * Even if the visual is TrueColor or DirectColor we treat it as
1061 * being color indexed. This is weird but might be useful to someone.
1062 */
1063 v->dithered_pf = v->undithered_pf = PF_Index;
1064 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1065 }
1066 else {
1067 /* RGB WINDOW:
1068 * We support RGB rendering into almost any kind of visual.
1069 */
1070 const int xclass = v->mesa_visual.visualType;
1071 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1072 setup_truecolor( v, b, cmap );
1073 }
1074 else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1075 setup_monochrome( v, b );
1076 }
1077 else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1078 if (!setup_grayscale( client, v, b, cmap )) {
1079 return GL_FALSE;
1080 }
1081 }
1082 else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1083 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1084 if (!setup_dithered_color( client, v, b, cmap )) {
1085 return GL_FALSE;
1086 }
1087 }
1088 else {
1089 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1090 return GL_FALSE;
1091 }
1092 v->mesa_visual.indexBits = 0;
1093
1094 if (_mesa_getenv("MESA_NO_DITHER")) {
1095 v->dithered_pf = v->undithered_pf;
1096 }
1097 }
1098
1099
1100 /*
1101 * If MESA_INFO env var is set print out some debugging info
1102 * which can help Brian figure out what's going on when a user
1103 * reports bugs.
1104 */
1105 if (_mesa_getenv("MESA_INFO")) {
1106 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1107 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1108 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1109 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1110 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1111 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1112 }
1113
1114 if (b && window) {
1115 /* Do window-specific initializations */
1116
1117 /* these should have been set in create_xmesa_buffer */
1118 ASSERT(b->frontxrb->drawable == window);
1119 ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1120
1121 /* Setup for single/double buffering */
1122 if (v->mesa_visual.doubleBufferMode) {
1123 /* Double buffered */
1124 b->shm = check_for_xshm( v->display );
1125 }
1126
1127 /* X11 graphics contexts */
1128 #ifdef XFree86Server
1129 b->gc = CreateScratchGC(v->display, window->depth);
1130 #else
1131 b->gc = XCreateGC( v->display, window, 0, NULL );
1132 #endif
1133 XMesaSetFunction( v->display, b->gc, GXcopy );
1134
1135 /* cleargc - for glClear() */
1136 #ifdef XFree86Server
1137 b->cleargc = CreateScratchGC(v->display, window->depth);
1138 #else
1139 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1140 #endif
1141 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1142
1143 /*
1144 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1145 * Patch contributed by Michael Pichler May 15, 1995.
1146 */
1147 #ifdef XFree86Server
1148 b->swapgc = CreateScratchGC(v->display, window->depth);
1149 {
1150 CARD32 v[1];
1151 v[0] = FALSE;
1152 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1153 }
1154 #else
1155 {
1156 XGCValues gcvalues;
1157 gcvalues.graphics_exposures = False;
1158 b->swapgc = XCreateGC(v->display, window,
1159 GCGraphicsExposures, &gcvalues);
1160 }
1161 #endif
1162 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1163 /*
1164 * Set fill style and tile pixmap once for all for HPCR stuff
1165 * (instead of doing it each time in clear_color_HPCR_pixmap())
1166 * Initialize whole stuff
1167 * Patch contributed by Jacques Leroy March 8, 1998.
1168 */
1169 if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1170 int i;
1171 for (i = 0; i < 16; i++) {
1172 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1173 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1174 }
1175 XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1176 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1177 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1178 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1179 }
1180
1181 /* Initialize the row buffer XImage for use in write_color_span() */
1182 #ifdef XFree86Server
1183 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1184 (char *)MALLOC(MAX_WIDTH*4));
1185 #else
1186 b->rowimage = XCreateImage( v->display,
1187 v->visinfo->visual,
1188 v->visinfo->depth,
1189 ZPixmap, 0, /*format, offset*/
1190 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1191 MAX_WIDTH, 1, /*width, height*/
1192 32, /*bitmap_pad*/
1193 0 /*bytes_per_line*/ );
1194 #endif
1195 if (!b->rowimage)
1196 return GL_FALSE;
1197 }
1198
1199 return GL_TRUE;
1200 }
1201
1202
1203
1204 /*
1205 * Convert an RGBA color to a pixel value.
1206 */
1207 unsigned long
1208 xmesa_color_to_pixel(GLcontext *ctx,
1209 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1210 GLuint pixelFormat)
1211 {
1212 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1213 switch (pixelFormat) {
1214 case PF_Index:
1215 return 0;
1216 case PF_Truecolor:
1217 {
1218 unsigned long p;
1219 PACK_TRUECOLOR( p, r, g, b );
1220 return p;
1221 }
1222 case PF_8A8B8G8R:
1223 return PACK_8A8B8G8R( r, g, b, a );
1224 case PF_8A8R8G8B:
1225 return PACK_8A8R8G8B( r, g, b, a );
1226 case PF_8R8G8B:
1227 /* fall through */
1228 case PF_8R8G8B24:
1229 return PACK_8R8G8B( r, g, b );
1230 case PF_5R6G5B:
1231 return PACK_5R6G5B( r, g, b );
1232 case PF_Dither:
1233 {
1234 DITHER_SETUP;
1235 return DITHER( 1, 0, r, g, b );
1236 }
1237 case PF_1Bit:
1238 /* 382 = (3*255)/2 */
1239 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1240 case PF_HPCR:
1241 return DITHER_HPCR(1, 1, r, g, b);
1242 case PF_Lookup:
1243 {
1244 LOOKUP_SETUP;
1245 return LOOKUP( r, g, b );
1246 }
1247 case PF_Grayscale:
1248 return GRAY_RGB( r, g, b );
1249 case PF_Dither_True:
1250 /* fall through */
1251 case PF_Dither_5R6G5B:
1252 {
1253 unsigned long p;
1254 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1255 return p;
1256 }
1257 default:
1258 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1259 }
1260 return 0;
1261 }
1262
1263
1264 #define NUM_VISUAL_TYPES 6
1265
1266 /**
1267 * Convert an X visual type to a GLX visual type.
1268 *
1269 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1270 * to be converted.
1271 * \return If \c visualType is a valid X visual type, a GLX visual type will
1272 * be returned. Otherwise \c GLX_NONE will be returned.
1273 *
1274 * \note
1275 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1276 * DRI CVS tree.
1277 */
1278 static GLint
1279 xmesa_convert_from_x_visual_type( int visualType )
1280 {
1281 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1282 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1283 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1284 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1285 };
1286
1287 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1288 ? glx_visual_types[ visualType ] : GLX_NONE;
1289 }
1290
1291
1292 /**********************************************************************/
1293 /***** Public Functions *****/
1294 /**********************************************************************/
1295
1296
1297 /*
1298 * Create a new X/Mesa visual.
1299 * Input: display - X11 display
1300 * visinfo - an XVisualInfo pointer
1301 * rgb_flag - GL_TRUE = RGB mode,
1302 * GL_FALSE = color index mode
1303 * alpha_flag - alpha buffer requested?
1304 * db_flag - GL_TRUE = double-buffered,
1305 * GL_FALSE = single buffered
1306 * stereo_flag - stereo visual?
1307 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1308 * GL_FALSE = use an off-screen pixmap for back buffer
1309 * depth_size - requested bits/depth values, or zero
1310 * stencil_size - requested bits/stencil values, or zero
1311 * accum_red_size - requested bits/red accum values, or zero
1312 * accum_green_size - requested bits/green accum values, or zero
1313 * accum_blue_size - requested bits/blue accum values, or zero
1314 * accum_alpha_size - requested bits/alpha accum values, or zero
1315 * num_samples - number of samples/pixel if multisampling, or zero
1316 * level - visual level, usually 0
1317 * visualCaveat - ala the GLX extension, usually GLX_NONE
1318 * Return; a new XMesaVisual or 0 if error.
1319 */
1320 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1321 XMesaVisualInfo visinfo,
1322 GLboolean rgb_flag,
1323 GLboolean alpha_flag,
1324 GLboolean db_flag,
1325 GLboolean stereo_flag,
1326 GLboolean ximage_flag,
1327 GLint depth_size,
1328 GLint stencil_size,
1329 GLint accum_red_size,
1330 GLint accum_green_size,
1331 GLint accum_blue_size,
1332 GLint accum_alpha_size,
1333 GLint num_samples,
1334 GLint level,
1335 GLint visualCaveat )
1336 {
1337 char *gamma;
1338 XMesaVisual v;
1339 GLint red_bits, green_bits, blue_bits, alpha_bits;
1340
1341 #ifndef XFree86Server
1342 /* For debugging only */
1343 if (_mesa_getenv("MESA_XSYNC")) {
1344 /* This makes debugging X easier.
1345 * In your debugger, set a breakpoint on _XError to stop when an
1346 * X protocol error is generated.
1347 */
1348 XSynchronize( display, 1 );
1349 }
1350 #endif
1351
1352 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1353 if (!v) {
1354 return NULL;
1355 }
1356
1357 /*
1358 * In the X server, NULL is passed in for the display. It will have
1359 * to be set before using this visual. See XMesaSetVisualDisplay()
1360 * below.
1361 */
1362 v->display = display;
1363
1364 /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1365 * the struct but we may need some of the information contained in it
1366 * at a later time.
1367 */
1368 #ifndef XFree86Server
1369 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1370 if(!v->visinfo) {
1371 _mesa_free(v);
1372 return NULL;
1373 }
1374 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1375 #endif
1376
1377 /* check for MESA_GAMMA environment variable */
1378 gamma = _mesa_getenv("MESA_GAMMA");
1379 if (gamma) {
1380 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1381 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1382 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1383 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1384 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1385 }
1386 else {
1387 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1388 }
1389
1390 v->ximage_flag = ximage_flag;
1391
1392 #ifdef XFree86Server
1393 /* We could calculate these values by ourselves. nplanes is either the sum
1394 * of the red, green, and blue bits or the number index bits.
1395 * ColormapEntries is either (1U << index_bits) or
1396 * (1U << max(redBits, greenBits, blueBits)).
1397 */
1398 assert(visinfo->nplanes > 0);
1399 v->nplanes = visinfo->nplanes;
1400 v->ColormapEntries = visinfo->ColormapEntries;
1401
1402 v->mesa_visual.redMask = visinfo->redMask;
1403 v->mesa_visual.greenMask = visinfo->greenMask;
1404 v->mesa_visual.blueMask = visinfo->blueMask;
1405 v->mesa_visual.visualID = visinfo->vid;
1406 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1407 #else
1408 v->mesa_visual.redMask = visinfo->red_mask;
1409 v->mesa_visual.greenMask = visinfo->green_mask;
1410 v->mesa_visual.blueMask = visinfo->blue_mask;
1411 v->mesa_visual.visualID = visinfo->visualid;
1412 v->mesa_visual.screen = visinfo->screen;
1413 #endif
1414
1415 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1416 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1417 #else
1418 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1419 #endif
1420
1421 v->mesa_visual.visualRating = visualCaveat;
1422
1423 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1424
1425 {
1426 const int xclass = v->mesa_visual.visualType;
1427 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1428 red_bits = _mesa_bitcount(GET_REDMASK(v));
1429 green_bits = _mesa_bitcount(GET_GREENMASK(v));
1430 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
1431 alpha_bits = 0;
1432 }
1433 else {
1434 /* this is an approximation */
1435 int depth;
1436 depth = GET_VISUAL_DEPTH(v);
1437 red_bits = depth / 3;
1438 depth -= red_bits;
1439 green_bits = depth / 2;
1440 depth -= green_bits;
1441 blue_bits = depth;
1442 alpha_bits = 0;
1443 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1444 }
1445 }
1446
1447 if (alpha_flag && alpha_bits == 0)
1448 alpha_bits = 8;
1449
1450 _mesa_initialize_visual( &v->mesa_visual,
1451 rgb_flag, db_flag, stereo_flag,
1452 red_bits, green_bits,
1453 blue_bits, alpha_bits,
1454 v->mesa_visual.indexBits,
1455 depth_size,
1456 stencil_size,
1457 accum_red_size, accum_green_size,
1458 accum_blue_size, accum_alpha_size,
1459 0 );
1460
1461 /* XXX minor hack */
1462 v->mesa_visual.level = level;
1463 return v;
1464 }
1465
1466
1467 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1468 {
1469 v->display = dpy;
1470 }
1471
1472
1473 void XMesaDestroyVisual( XMesaVisual v )
1474 {
1475 #ifndef XFree86Server
1476 _mesa_free(v->visinfo);
1477 #endif
1478 _mesa_free(v);
1479 }
1480
1481
1482
1483 /**
1484 * Create a new XMesaContext.
1485 * \param v the XMesaVisual
1486 * \param share_list another XMesaContext with which to share display
1487 * lists or NULL if no sharing is wanted.
1488 * \return an XMesaContext or NULL if error.
1489 */
1490 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1491 {
1492 static GLboolean firstTime = GL_TRUE;
1493 XMesaContext c;
1494 GLcontext *mesaCtx;
1495 struct dd_function_table functions;
1496 TNLcontext *tnl;
1497
1498 if (firstTime) {
1499 _glthread_INIT_MUTEX(_xmesa_lock);
1500 firstTime = GL_FALSE;
1501 }
1502
1503 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1504 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1505 if (!c)
1506 return NULL;
1507
1508 mesaCtx = &(c->mesa);
1509
1510 /* initialize with default driver functions, then plug in XMesa funcs */
1511 _mesa_init_driver_functions(&functions);
1512 xmesa_init_driver_functions(v, &functions);
1513 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1514 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1515 &functions, (void *) c)) {
1516 _mesa_free(c);
1517 return NULL;
1518 }
1519
1520 _mesa_enable_sw_extensions(mesaCtx);
1521 _mesa_enable_1_3_extensions(mesaCtx);
1522 _mesa_enable_1_4_extensions(mesaCtx);
1523 _mesa_enable_1_5_extensions(mesaCtx);
1524 _mesa_enable_2_0_extensions(mesaCtx);
1525 #if ENABLE_EXT_texure_compression_s3tc
1526 if (c->Mesa_DXTn) {
1527 _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1528 _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1529 }
1530 _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1531 #endif
1532 #if ENABLE_EXT_timer_query
1533 _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1534 #endif
1535
1536 #ifdef XFree86Server
1537 /* If we're running in the X server, do bounds checking to prevent
1538 * segfaults and server crashes!
1539 */
1540 mesaCtx->Const.CheckArrayBounds = GL_TRUE;
1541 #endif
1542
1543 /* finish up xmesa context initializations */
1544 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1545 c->xm_visual = v;
1546 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1547 c->display = v->display;
1548 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1549
1550 /* Initialize the software rasterizer and helper modules.
1551 */
1552 if (!_swrast_CreateContext( mesaCtx ) ||
1553 !_vbo_CreateContext( mesaCtx ) ||
1554 !_tnl_CreateContext( mesaCtx ) ||
1555 !_swsetup_CreateContext( mesaCtx )) {
1556 _mesa_free_context_data(&c->mesa);
1557 _mesa_free(c);
1558 return NULL;
1559 }
1560
1561 /* tnl setup */
1562 tnl = TNL_CONTEXT(mesaCtx);
1563 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1564 /* swrast setup */
1565 xmesa_register_swrast_functions( mesaCtx );
1566 _swsetup_Wakeup(mesaCtx);
1567
1568 return c;
1569 }
1570
1571
1572
1573 void XMesaDestroyContext( XMesaContext c )
1574 {
1575 GLcontext *mesaCtx = &c->mesa;
1576 #ifdef FX
1577 XMesaBuffer xmbuf = XMESA_BUFFER(mesaCtx->DrawBuffer);
1578
1579 if (xmbuf && xmbuf->FXctx)
1580 fxMesaDestroyContext(xmbuf->FXctx);
1581 #endif
1582 _swsetup_DestroyContext( mesaCtx );
1583 _swrast_DestroyContext( mesaCtx );
1584 _tnl_DestroyContext( mesaCtx );
1585 _vbo_DestroyContext( mesaCtx );
1586 _mesa_free_context_data( mesaCtx );
1587 _mesa_free( c );
1588 }
1589
1590
1591
1592 /**
1593 * Private function for creating an XMesaBuffer which corresponds to an
1594 * X window or pixmap.
1595 * \param v the window's XMesaVisual
1596 * \param w the window we're wrapping
1597 * \param c context used to initialize the buffer if 3Dfx mode in use.
1598 * \return new XMesaBuffer or NULL if error
1599 */
1600 XMesaBuffer
1601 XMesaCreateWindowBuffer2(XMesaVisual v, XMesaWindow w, XMesaContext c)
1602 {
1603 #ifndef XFree86Server
1604 XWindowAttributes attr;
1605 #endif
1606 #ifdef FX
1607 char *fxEnvVar;
1608 #endif
1609 int client = 0;
1610 XMesaBuffer b;
1611 XMesaColormap cmap;
1612
1613 assert(v);
1614 assert(w);
1615 (void) c;
1616
1617 /* Check that window depth matches visual depth */
1618 #ifdef XFree86Server
1619 client = CLIENT_ID(((XMesaDrawable)w)->id);
1620
1621 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1622 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1623 GET_VISUAL_DEPTH(v), ((XMesaDrawable) w)->depth);
1624 return NULL;
1625 }
1626 #else
1627 XGetWindowAttributes( v->display, w, &attr );
1628
1629 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1630 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1631 GET_VISUAL_DEPTH(v), attr.depth);
1632 return NULL;
1633 }
1634 #endif
1635
1636 /* Find colormap */
1637 #ifdef XFree86Server
1638 cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1639 #else
1640 if (attr.colormap) {
1641 cmap = attr.colormap;
1642 }
1643 else {
1644 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1645 /* this is weird, a window w/out a colormap!? */
1646 /* OK, let's just allocate a new one and hope for the best */
1647 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1648 }
1649 #endif
1650
1651 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1652 if (!b)
1653 return NULL;
1654
1655 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1656 (XMesaDrawable) w, cmap )) {
1657 xmesa_free_buffer(b);
1658 return NULL;
1659 }
1660
1661 #ifdef FX
1662 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1663 if (fxEnvVar) {
1664 if (fxEnvVar[0]!='d') {
1665 int attribs[100];
1666 int numAttribs = 0;
1667 int hw;
1668 if (v->mesa_visual.depthBits > 0) {
1669 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1670 attribs[numAttribs++] = v->mesa_visual.depthBits;
1671 }
1672 if (v->mesa_visual.doubleBufferMode) {
1673 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1674 }
1675 if (v->mesa_visual.accumRedBits > 0) {
1676 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1677 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1678 }
1679 if (v->mesa_visual.stencilBits > 0) {
1680 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1681 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1682 }
1683 if (v->mesa_visual.alphaBits > 0) {
1684 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1685 attribs[numAttribs++] = v->mesa_visual.alphaBits;
1686 }
1687 if (1) {
1688 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1689 attribs[numAttribs++] = (int) &(c->mesa);
1690 }
1691 attribs[numAttribs++] = FXMESA_NONE;
1692
1693 /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
1694 hw = fxMesaSelectCurrentBoard(0);
1695
1696 /* if these fail, there's a new bug somewhere */
1697 ASSERT(b->mesa_buffer.Width > 0);
1698 ASSERT(b->mesa_buffer.Height > 0);
1699
1700 if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
1701 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1702 b->mesa_buffer.Height, attribs);
1703 if ((v->undithered_pf!=PF_Index) && (b->backxrb->ximage)) {
1704 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1705 if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
1706 b->FXwindowHack = GL_TRUE;
1707 FX_grSstControl(GR_CONTROL_DEACTIVATE);
1708 }
1709 else {
1710 b->FXwindowHack = GL_FALSE;
1711 }
1712 }
1713 }
1714 else {
1715 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1716 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1717 GR_REFRESH_75Hz, attribs);
1718 else
1719 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1720 b->mesa_buffer.Height, attribs);
1721 b->FXisHackUsable = GL_FALSE;
1722 b->FXwindowHack = GL_FALSE;
1723 }
1724 /*
1725 fprintf(stderr,
1726 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1727 hw, b->mesa_buffer.Width, b->mesa_buffer.Height,
1728 b->FXisHackUsable, b->FXwindowHack);
1729 */
1730 }
1731 }
1732 else {
1733 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1734 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1735 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1736 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1737 }
1738 #endif
1739
1740 return b;
1741 }
1742
1743
1744 XMesaBuffer
1745 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1746 {
1747 return XMesaCreateWindowBuffer2( v, w, NULL );
1748 }
1749
1750
1751 /**
1752 * Create a new XMesaBuffer from an X pixmap.
1753 *
1754 * \param v the XMesaVisual
1755 * \param p the pixmap
1756 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1757 * \c GLX_DIRECT_COLOR visual for the pixmap
1758 * \returns new XMesaBuffer or NULL if error
1759 */
1760 XMesaBuffer
1761 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1762 {
1763 int client = 0;
1764 XMesaBuffer b;
1765
1766 assert(v);
1767
1768 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1769 if (!b)
1770 return NULL;
1771
1772 #ifdef XFree86Server
1773 client = CLIENT_ID(((XMesaDrawable)p)->id);
1774 #endif
1775
1776 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1777 (XMesaDrawable) p, cmap)) {
1778 xmesa_free_buffer(b);
1779 return NULL;
1780 }
1781
1782 return b;
1783 }
1784
1785
1786
1787 XMesaBuffer
1788 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1789 unsigned int width, unsigned int height)
1790 {
1791 #ifdef XFree86Server
1792 return 0;
1793 #else
1794 int client = 0;
1795 XMesaWindow root;
1796 XMesaDrawable drawable; /* X Pixmap Drawable */
1797 XMesaBuffer b;
1798
1799 /* allocate pixmap for front buffer */
1800 root = RootWindow( v->display, v->visinfo->screen );
1801 drawable = XCreatePixmap(v->display, root, width, height,
1802 v->visinfo->depth);
1803 if (!drawable)
1804 return NULL;
1805
1806 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1807 if (!b)
1808 return NULL;
1809
1810 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1811 drawable, cmap)) {
1812 xmesa_free_buffer(b);
1813 return NULL;
1814 }
1815
1816 return b;
1817 #endif
1818 }
1819
1820
1821
1822 /*
1823 * Deallocate an XMesaBuffer structure and all related info.
1824 */
1825 void
1826 XMesaDestroyBuffer(XMesaBuffer b)
1827 {
1828 xmesa_free_buffer(b);
1829 }
1830
1831
1832 /**
1833 * Query the current window size and update the corresponding GLframebuffer
1834 * and all attached renderbuffers.
1835 * Called when:
1836 * 1. the first time a buffer is bound to a context.
1837 * 2. from glViewport to poll for window size changes
1838 * 3. from the XMesaResizeBuffers() API function.
1839 */
1840 void
1841 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1842 {
1843 GLuint width, height;
1844 xmesa_get_window_size(xmctx->display, drawBuffer, &width, &height);
1845 if (drawBuffer->mesa_buffer.Width != width ||
1846 drawBuffer->mesa_buffer.Height != height) {
1847 _mesa_resize_framebuffer(&(xmctx->mesa),
1848 &(drawBuffer->mesa_buffer), width, height);
1849 }
1850 drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1851 }
1852
1853
1854 /*
1855 * Bind buffer b to context c and make c the current rendering context.
1856 */
1857 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1858 {
1859 return XMesaMakeCurrent2( c, b, b );
1860 }
1861
1862
1863 /*
1864 * Bind buffer b to context c and make c the current rendering context.
1865 */
1866 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1867 XMesaBuffer readBuffer )
1868 {
1869 if (c) {
1870 if (!drawBuffer || !readBuffer)
1871 return GL_FALSE; /* must specify buffers! */
1872
1873 #ifdef FX
1874 if (drawBuffer->FXctx) {
1875 fxMesaMakeCurrent(drawBuffer->FXctx);
1876
1877 c->xm_buffer = drawBuffer;
1878
1879 return GL_TRUE;
1880 }
1881 #endif
1882 if (&(c->mesa) == _mesa_get_current_context()
1883 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1884 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1885 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1886 /* same context and buffer, do nothing */
1887 return GL_TRUE;
1888 }
1889
1890 c->xm_buffer = drawBuffer;
1891
1892 /* Call this periodically to detect when the user has begun using
1893 * GL rendering from multiple threads.
1894 */
1895 _glapi_check_multithread();
1896
1897 xmesa_check_and_update_buffer_size(c, drawBuffer);
1898 if (readBuffer != drawBuffer)
1899 xmesa_check_and_update_buffer_size(c, readBuffer);
1900
1901 _mesa_make_current(&(c->mesa),
1902 &drawBuffer->mesa_buffer,
1903 &readBuffer->mesa_buffer);
1904
1905 if (c->xm_visual->mesa_visual.rgbMode) {
1906 /*
1907 * Must recompute and set these pixel values because colormap
1908 * can be different for different windows.
1909 */
1910 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1911 c->clearcolor[0],
1912 c->clearcolor[1],
1913 c->clearcolor[2],
1914 c->clearcolor[3],
1915 c->xm_visual->undithered_pf);
1916 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1917 }
1918
1919 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1920 drawBuffer->wasCurrent = GL_TRUE;
1921 }
1922 else {
1923 /* Detach */
1924 _mesa_make_current( NULL, NULL, NULL );
1925 }
1926 return GL_TRUE;
1927 }
1928
1929
1930 /*
1931 * Unbind the context c from its buffer.
1932 */
1933 GLboolean XMesaUnbindContext( XMesaContext c )
1934 {
1935 /* A no-op for XFree86 integration purposes */
1936 return GL_TRUE;
1937 }
1938
1939
1940 XMesaContext XMesaGetCurrentContext( void )
1941 {
1942 GET_CURRENT_CONTEXT(ctx);
1943 if (ctx) {
1944 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1945 return xmesa;
1946 }
1947 else {
1948 return 0;
1949 }
1950 }
1951
1952
1953 XMesaBuffer XMesaGetCurrentBuffer( void )
1954 {
1955 GET_CURRENT_CONTEXT(ctx);
1956 if (ctx) {
1957 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1958 return xmbuf;
1959 }
1960 else {
1961 return 0;
1962 }
1963 }
1964
1965
1966 /* New in Mesa 3.1 */
1967 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1968 {
1969 GET_CURRENT_CONTEXT(ctx);
1970 if (ctx) {
1971 return XMESA_BUFFER(ctx->ReadBuffer);
1972 }
1973 else {
1974 return 0;
1975 }
1976 }
1977
1978
1979 GLboolean XMesaForceCurrent(XMesaContext c)
1980 {
1981 if (c) {
1982 if (&(c->mesa) != _mesa_get_current_context()) {
1983 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
1984 }
1985 }
1986 else {
1987 _mesa_make_current(NULL, NULL, NULL);
1988 }
1989 return GL_TRUE;
1990 }
1991
1992
1993 GLboolean XMesaLoseCurrent(XMesaContext c)
1994 {
1995 (void) c;
1996 _mesa_make_current(NULL, NULL, NULL);
1997 return GL_TRUE;
1998 }
1999
2000
2001 /*
2002 * Switch 3Dfx support hack between window and full-screen mode.
2003 */
2004 GLboolean XMesaSetFXmode( GLint mode )
2005 {
2006 #ifdef FX
2007 const char *fx = _mesa_getenv("MESA_GLX_FX");
2008 if (fx && fx[0] != 'd') {
2009 GET_CURRENT_CONTEXT(ctx);
2010 GrHwConfiguration hw;
2011 if (!FX_grSstQueryHardware(&hw)) {
2012 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2013 return GL_FALSE;
2014 }
2015 if (hw.num_sst < 1) {
2016 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2017 return GL_FALSE;
2018 }
2019 if (ctx) {
2020 /* [dBorca] Hack alert:
2021 * oh, this is sooo wrong: ctx above is
2022 * really an fxMesaContext, not an XMesaContext
2023 */
2024 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
2025 if (mode == XMESA_FX_WINDOW) {
2026 if (xmbuf->FXisHackUsable) {
2027 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2028 xmbuf->FXwindowHack = GL_TRUE;
2029 return GL_TRUE;
2030 }
2031 }
2032 else if (mode == XMESA_FX_FULLSCREEN) {
2033 FX_grSstControl(GR_CONTROL_ACTIVATE);
2034 xmbuf->FXwindowHack = GL_FALSE;
2035 return GL_TRUE;
2036 }
2037 else {
2038 /* Error: Bad mode value */
2039 }
2040 }
2041 }
2042 /*fprintf(stderr, "fallthrough\n");*/
2043 #else
2044 (void) mode;
2045 #endif
2046 return GL_FALSE;
2047 }
2048
2049
2050
2051 #ifdef FX
2052 /*
2053 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2054 */
2055 static void FXgetImage( XMesaBuffer b )
2056 {
2057 GET_CURRENT_CONTEXT(ctx);
2058 static unsigned short pixbuf[MAX_WIDTH];
2059 GLuint x, y;
2060 GLuint width, height;
2061 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2062
2063 #ifdef XFree86Server
2064 x = b->frontxrb->pixmap->x;
2065 y = b->frontxrb->pixmap->y;
2066 width = b->frontxrb->pixmap->width;
2067 height = b->frontxrb->pixmap->height;
2068 depth = b->frontxrb->pixmap->depth;
2069 #else
2070 xmesa_get_window_size(b->display, b, &width, &height);
2071 x = y = 0;
2072 #endif
2073 if (b->mesa_buffer.Width != width || b->mesa_buffer.Height != height) {
2074 b->mesa_buffer.Width = MIN2((int)width, b->FXctx->width);
2075 b->mesa_buffer.Height = MIN2((int)height, b->FXctx->height);
2076 if (b->mesa_buffer.Width & 1)
2077 b->mesa_buffer.Width--; /* prevent odd width */
2078 }
2079
2080 /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
2081 /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
2082 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2083 /* Special case: 16bpp RGB */
2084 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2085 0, b->FXctx->height - b->mesa_buffer.Height, /*pos*/
2086 b->mesa_buffer.Width, b->mesa_buffer.Height, /* size */
2087 b->mesa_buffer.Width * sizeof(GLushort), /* stride */
2088 b->backxrb->ximage->data); /* dest buffer */
2089 }
2090 else if (b->xm_visual->dithered_pf==PF_Dither
2091 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2092 /* Special case: 8bpp RGB */
2093 for (y=0;y<b->mesa_buffer.Height;y++) {
2094 GLubyte *ptr = (GLubyte*) b->backxrb->ximage->data
2095 + b->backxrb->ximage->bytes_per_line * y;
2096 XDITHER_SETUP(y);
2097
2098 /* read row from 3Dfx frame buffer */
2099 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2100 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2101 b->mesa_buffer.Width, 1,
2102 0,
2103 pixbuf );
2104
2105 /* write to XImage back buffer */
2106 for (x=0;x<b->mesa_buffer.Width;x++) {
2107 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2108 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2109 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2110 *ptr++ = XDITHER( x, r, g, b);
2111 }
2112 }
2113 }
2114 else {
2115 /* General case: slow! */
2116 for (y=0;y<b->mesa_buffer.Height;y++) {
2117 /* read row from 3Dfx frame buffer */
2118 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2119 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2120 b->mesa_buffer.Width, 1,
2121 0,
2122 pixbuf );
2123
2124 /* write to XImage back buffer */
2125 for (x=0;x<b->mesa_buffer.Width;x++) {
2126 XMesaPutPixel(b->backxrb->ximage,x,y,
2127 xmesa_color_to_pixel(ctx,
2128 (pixbuf[x] & 0xf800) >> 8,
2129 (pixbuf[x] & 0x07e0) >> 3,
2130 (pixbuf[x] & 0x001f) << 3,
2131 0xff,
2132 b->xm_visual->undithered_pf));
2133 }
2134 }
2135 }
2136 /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
2137 }
2138 #endif
2139
2140
2141 /*
2142 * Copy the back buffer to the front buffer. If there's no back buffer
2143 * this is a no-op.
2144 */
2145 void XMesaSwapBuffers( XMesaBuffer b )
2146 {
2147 GET_CURRENT_CONTEXT(ctx);
2148
2149 if (!b->backxrb) {
2150 /* single buffered */
2151 return;
2152 }
2153
2154 /* If we're swapping the buffer associated with the current context
2155 * we have to flush any pending rendering commands first.
2156 */
2157 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2158 _mesa_notifySwapBuffers(ctx);
2159
2160 if (b->db_mode) {
2161 #ifdef FX
2162 if (b->FXctx) {
2163 fxMesaSwapBuffers();
2164
2165 if (b->FXwindowHack)
2166 FXgetImage(b);
2167 else
2168 return;
2169 }
2170 #endif
2171 if (b->backxrb->ximage) {
2172 /* Copy Ximage from host's memory to server's window */
2173 #if defined(USE_XSHM) && !defined(XFree86Server)
2174 if (b->shm) {
2175 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2176 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2177 b->swapgc,
2178 b->backxrb->ximage, 0, 0,
2179 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2180 False );
2181 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2182 }
2183 else
2184 #endif
2185 {
2186 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2187 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2188 b->swapgc,
2189 b->backxrb->ximage, 0, 0,
2190 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2191 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2192 }
2193 }
2194 else {
2195 /* Copy pixmap to window on server */
2196 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2197 XMesaCopyArea( b->xm_visual->display,
2198 b->backxrb->pixmap, /* source drawable */
2199 b->frontxrb->drawable, /* dest. drawable */
2200 b->swapgc,
2201 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2202 0, 0 /* dest region */
2203 );
2204 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2205 }
2206 }
2207 #if !defined(XFree86Server)
2208 XSync( b->xm_visual->display, False );
2209 #endif
2210 }
2211
2212
2213
2214 /*
2215 * Copy sub-region of back buffer to front buffer
2216 */
2217 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2218 {
2219 GET_CURRENT_CONTEXT(ctx);
2220
2221 /* If we're swapping the buffer associated with the current context
2222 * we have to flush any pending rendering commands first.
2223 */
2224 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2225 _mesa_notifySwapBuffers(ctx);
2226
2227 if (!b->backxrb) {
2228 /* single buffered */
2229 return;
2230 }
2231
2232 if (b->db_mode) {
2233 int yTop = b->mesa_buffer.Height - y - height;
2234 #ifdef FX
2235 if (b->FXctx) {
2236 fxMesaSwapBuffers();
2237 if (b->FXwindowHack)
2238 FXgetImage(b);
2239 else
2240 return;
2241 }
2242 #endif
2243 if (b->backxrb->ximage) {
2244 /* Copy Ximage from host's memory to server's window */
2245 #if defined(USE_XSHM) && !defined(XFree86Server)
2246 if (b->shm) {
2247 /* XXX assuming width and height aren't too large! */
2248 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2249 b->swapgc,
2250 b->backxrb->ximage, x, yTop,
2251 x, yTop, width, height, False );
2252 /* wait for finished event??? */
2253 }
2254 else
2255 #endif
2256 {
2257 /* XXX assuming width and height aren't too large! */
2258 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2259 b->swapgc,
2260 b->backxrb->ximage, x, yTop,
2261 x, yTop, width, height );
2262 }
2263 }
2264 else {
2265 /* Copy pixmap to window on server */
2266 XMesaCopyArea( b->xm_visual->display,
2267 b->backxrb->pixmap, /* source drawable */
2268 b->frontxrb->drawable, /* dest. drawable */
2269 b->swapgc,
2270 x, yTop, width, height, /* source region */
2271 x, yTop /* dest region */
2272 );
2273 }
2274 }
2275 }
2276
2277
2278 /*
2279 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2280 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2281 * back buffer directly.
2282 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2283 * ximage - pointer to back buffer's XImage, or NULL
2284 * Return: GL_TRUE = context is double buffered
2285 * GL_FALSE = context is single buffered
2286 */
2287 #ifndef XFree86Server
2288 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2289 XMesaPixmap *pixmap,
2290 XMesaImage **ximage )
2291 {
2292 if (b->db_mode) {
2293 if (pixmap)
2294 *pixmap = b->backxrb->pixmap;
2295 if (ximage)
2296 *ximage = b->backxrb->ximage;
2297 return GL_TRUE;
2298 }
2299 else {
2300 *pixmap = 0;
2301 *ximage = NULL;
2302 return GL_FALSE;
2303 }
2304 }
2305 #endif /* XFree86Server */
2306
2307
2308 /*
2309 * Return the depth buffer associated with an XMesaBuffer.
2310 * Input: b - the XMesa buffer handle
2311 * Output: width, height - size of buffer in pixels
2312 * bytesPerValue - bytes per depth value (2 or 4)
2313 * buffer - pointer to depth buffer values
2314 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2315 */
2316 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2317 GLint *bytesPerValue, void **buffer )
2318 {
2319 struct gl_renderbuffer *rb
2320 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2321 if (!rb || !rb->Data) {
2322 *width = 0;
2323 *height = 0;
2324 *bytesPerValue = 0;
2325 *buffer = 0;
2326 return GL_FALSE;
2327 }
2328 else {
2329 *width = b->mesa_buffer.Width;
2330 *height = b->mesa_buffer.Height;
2331 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2332 ? sizeof(GLushort) : sizeof(GLuint);
2333 *buffer = rb->Data;
2334 return GL_TRUE;
2335 }
2336 }
2337
2338
2339 void XMesaFlush( XMesaContext c )
2340 {
2341 if (c && c->xm_visual) {
2342 #ifdef XFree86Server
2343 /* NOT_NEEDED */
2344 #else
2345 XSync( c->xm_visual->display, False );
2346 #endif
2347 }
2348 }
2349
2350
2351
2352 const char *XMesaGetString( XMesaContext c, int name )
2353 {
2354 (void) c;
2355 if (name==XMESA_VERSION) {
2356 return "5.0";
2357 }
2358 else if (name==XMESA_EXTENSIONS) {
2359 return "";
2360 }
2361 else {
2362 return NULL;
2363 }
2364 }
2365
2366
2367
2368 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2369 {
2370 XMesaBuffer b;
2371 for (b=XMesaBufferList; b; b=b->Next) {
2372 if (b->frontxrb->drawable == d && b->display == dpy) {
2373 return b;
2374 }
2375 }
2376 return NULL;
2377 }
2378
2379
2380 /**
2381 * Free/destroy all XMesaBuffers associated with given display.
2382 */
2383 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2384 {
2385 XMesaBuffer b, next;
2386 for (b = XMesaBufferList; b; b = next) {
2387 next = b->Next;
2388 if (b->display == dpy) {
2389 xmesa_free_buffer(b);
2390 }
2391 }
2392 }
2393
2394
2395 /*
2396 * Look for XMesaBuffers whose X window has been destroyed.
2397 * Deallocate any such XMesaBuffers.
2398 */
2399 void XMesaGarbageCollect( void )
2400 {
2401 XMesaBuffer b, next;
2402 for (b=XMesaBufferList; b; b=next) {
2403 next = b->Next;
2404 if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2405 #ifdef XFree86Server
2406 /* NOT_NEEDED */
2407 #else
2408 XSync(b->display, False);
2409 if (!window_exists( b->display, b->frontxrb->drawable )) {
2410 /* found a dead window, free the ancillary info */
2411 XMesaDestroyBuffer( b );
2412 }
2413 #endif
2414 }
2415 }
2416 }
2417
2418
2419 void XMesaReset( void )
2420 {
2421 while (XMesaBufferList)
2422 XMesaDestroyBuffer(XMesaBufferList);
2423
2424 XMesaBufferList = NULL;
2425 }
2426
2427
2428 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2429 GLfloat red, GLfloat green,
2430 GLfloat blue, GLfloat alpha )
2431 {
2432 GLcontext *ctx = &xmesa->mesa;
2433 GLint r = (GLint) (red * 255.0F);
2434 GLint g = (GLint) (green * 255.0F);
2435 GLint b = (GLint) (blue * 255.0F);
2436 GLint a = (GLint) (alpha * 255.0F);
2437
2438 switch (xmesa->pixelformat) {
2439 case PF_Index:
2440 return 0;
2441 case PF_Truecolor:
2442 {
2443 unsigned long p;
2444 PACK_TRUECOLOR( p, r, g, b );
2445 return p;
2446 }
2447 case PF_8A8B8G8R:
2448 return PACK_8A8B8G8R( r, g, b, a );
2449 case PF_8A8R8G8B:
2450 return PACK_8A8R8G8B( r, g, b, a );
2451 case PF_8R8G8B:
2452 return PACK_8R8G8B( r, g, b );
2453 case PF_5R6G5B:
2454 return PACK_5R6G5B( r, g, b );
2455 case PF_Dither:
2456 {
2457 DITHER_SETUP;
2458 return DITHER( x, y, r, g, b );
2459 }
2460 case PF_1Bit:
2461 /* 382 = (3*255)/2 */
2462 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2463 case PF_HPCR:
2464 return DITHER_HPCR(x, y, r, g, b);
2465 case PF_Lookup:
2466 {
2467 LOOKUP_SETUP;
2468 return LOOKUP( r, g, b );
2469 }
2470 case PF_Grayscale:
2471 return GRAY_RGB( r, g, b );
2472 case PF_Dither_5R6G5B:
2473 /* fall through */
2474 case PF_Dither_True:
2475 {
2476 unsigned long p;
2477 PACK_TRUEDITHER(p, x, y, r, g, b);
2478 return p;
2479 }
2480 default:
2481 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2482 }
2483 return 0;
2484 }
2485
2486
2487 /*
2488 * This is typically called when the window size changes and we need
2489 * to reallocate the buffer's back/depth/stencil/accum buffers.
2490 */
2491 void
2492 XMesaResizeBuffers( XMesaBuffer b )
2493 {
2494 GET_CURRENT_CONTEXT(ctx);
2495 XMesaContext xmctx = XMESA_CONTEXT(ctx);
2496 xmesa_check_and_update_buffer_size(xmctx, b);
2497 }
2498