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Rewrite code related to buffer destruction.
[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,
387 GL_FALSE);
388 if (!b->frontxrb) {
389 _mesa_free(b);
390 return NULL;
391 }
392 b->frontxrb->Parent = b;
393 b->frontxrb->drawable = d;
394 b->frontxrb->pixmap = (XMesaPixmap) d;
395 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
396 &b->frontxrb->Base);
397
398 /*
399 * Back renderbuffer
400 */
401 if (vis->mesa_visual.doubleBufferMode) {
402 b->backxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual,
403 GL_TRUE);
404 if (!b->backxrb) {
405 /* XXX free front xrb too */
406 _mesa_free(b);
407 return NULL;
408 }
409 b->backxrb->Parent = b;
410 /* determine back buffer implementation */
411 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
412
413 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
414 &b->backxrb->Base);
415 }
416
417 /*
418 * Software alpha planes
419 */
420 if (vis->mesa_visual.alphaBits > 0
421 && vis->undithered_pf != PF_8A8B8G8R
422 && vis->undithered_pf != PF_8A8R8G8B) {
423 /* Visual has alpha, but pixel format doesn't support it.
424 * We'll use an alpha renderbuffer wrapper.
425 */
426 swAlpha = GL_TRUE;
427 }
428 else {
429 swAlpha = GL_FALSE;
430 }
431
432 /*
433 * Other renderbuffer (depth, stencil, etc)
434 */
435 _mesa_add_soft_renderbuffers(&b->mesa_buffer,
436 GL_FALSE, /* color */
437 vis->mesa_visual.haveDepthBuffer,
438 vis->mesa_visual.haveStencilBuffer,
439 vis->mesa_visual.haveAccumBuffer,
440 swAlpha,
441 vis->mesa_visual.numAuxBuffers > 0 );
442
443 /* insert buffer into linked list */
444 b->Next = XMesaBufferList;
445 XMesaBufferList = b;
446
447 return b;
448 }
449
450
451 /**
452 * Find an XMesaBuffer by matching X display and colormap but NOT matching
453 * the notThis buffer.
454 */
455 XMesaBuffer
456 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
457 {
458 XMesaBuffer b;
459 for (b=XMesaBufferList; b; b=b->Next) {
460 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
461 return b;
462 }
463 }
464 return NULL;
465 }
466
467
468 /**
469 * Remove buffer from linked list, delete if no longer referenced.
470 */
471 static void
472 xmesa_free_buffer(XMesaBuffer buffer)
473 {
474 XMesaBuffer prev = NULL, b;
475
476 for (b = XMesaBufferList; b; b = b->Next) {
477 if (b == buffer) {
478 struct gl_framebuffer *fb = &buffer->mesa_buffer;
479
480 /* unlink buffer from list */
481 if (prev)
482 prev->Next = buffer->Next;
483 else
484 XMesaBufferList = buffer->Next;
485
486 /* mark as delete pending */
487 fb->DeletePending = GL_TRUE;
488 /* Dereference. If count = zero we'll really delete the buffer */
489 _mesa_dereference_framebuffer(&fb);
490
491 return;
492 }
493 /* continue search */
494 prev = b;
495 }
496 /* buffer not found in XMesaBufferList */
497 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
498 }
499
500
501 /**
502 * Copy X color table stuff from one XMesaBuffer to another.
503 */
504 static void
505 copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
506 {
507 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
508 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
509 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
510 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
511 dst->num_alloced = src->num_alloced;
512 MEMCPY(dst->alloced_colors, src->alloced_colors,
513 sizeof(src->alloced_colors));
514 }
515
516
517
518 /**********************************************************************/
519 /***** Misc Private Functions *****/
520 /**********************************************************************/
521
522
523 /**
524 * A replacement for XAllocColor. This function should never
525 * fail to allocate a color. When XAllocColor fails, we return
526 * the nearest matching color. If we have to allocate many colors
527 * this function isn't too efficient; the XQueryColors() could be
528 * done just once.
529 * Written by Michael Pichler, Brian Paul, Mark Kilgard
530 * Input: dpy - X display
531 * cmap - X colormap
532 * cmapSize - size of colormap
533 * In/Out: color - the XColor struct
534 * Output: exact - 1=exact color match, 0=closest match
535 * alloced - 1=XAlloc worked, 0=XAlloc failed
536 */
537 static void
538 noFaultXAllocColor( int client,
539 XMesaDisplay *dpy,
540 XMesaColormap cmap,
541 int cmapSize,
542 XMesaColor *color,
543 int *exact, int *alloced )
544 {
545 #ifdef XFree86Server
546 Pixel *ppixIn;
547 xrgb *ctable;
548 #else
549 /* we'll try to cache ctable for better remote display performance */
550 static Display *prevDisplay = NULL;
551 static XMesaColormap prevCmap = 0;
552 static int prevCmapSize = 0;
553 static XMesaColor *ctable = NULL;
554 #endif
555 XMesaColor subColor;
556 int i, bestmatch;
557 double mindist; /* 3*2^16^2 exceeds long int precision. */
558
559 (void) client;
560
561 /* First try just using XAllocColor. */
562 #ifdef XFree86Server
563 if (AllocColor(cmap,
564 &color->red, &color->green, &color->blue,
565 &color->pixel,
566 client) == Success)
567 #else
568 if (XAllocColor(dpy, cmap, color))
569 #endif
570 {
571 *exact = 1;
572 *alloced = 1;
573 return;
574 }
575
576 /* Alloc failed, search for closest match */
577
578 /* Retrieve color table entries. */
579 /* XXX alloca candidate. */
580 #ifdef XFree86Server
581 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
582 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
583 for (i = 0; i < cmapSize; i++) {
584 ppixIn[i] = i;
585 }
586 QueryColors(cmap, cmapSize, ppixIn, ctable);
587 #else
588 if (prevDisplay != dpy || prevCmap != cmap
589 || prevCmapSize != cmapSize || !ctable) {
590 /* free previously cached color table */
591 if (ctable)
592 _mesa_free(ctable);
593 /* Get the color table from X */
594 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
595 assert(ctable);
596 for (i = 0; i < cmapSize; i++) {
597 ctable[i].pixel = i;
598 }
599 XQueryColors(dpy, cmap, ctable, cmapSize);
600 prevDisplay = dpy;
601 prevCmap = cmap;
602 prevCmapSize = cmapSize;
603 }
604 #endif
605
606 /* Find best match. */
607 bestmatch = -1;
608 mindist = 0.0;
609 for (i = 0; i < cmapSize; i++) {
610 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
611 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
612 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
613 double dist = dr * dr + dg * dg + db * db;
614 if (bestmatch < 0 || dist < mindist) {
615 bestmatch = i;
616 mindist = dist;
617 }
618 }
619
620 /* Return result. */
621 subColor.red = ctable[bestmatch].red;
622 subColor.green = ctable[bestmatch].green;
623 subColor.blue = ctable[bestmatch].blue;
624 /* Try to allocate the closest match color. This should only
625 * fail if the cell is read/write. Otherwise, we're incrementing
626 * the cell's reference count.
627 */
628 #ifdef XFree86Server
629 if (AllocColor(cmap,
630 &subColor.red, &subColor.green, &subColor.blue,
631 &subColor.pixel,
632 client) == Success) {
633 #else
634 if (XAllocColor(dpy, cmap, &subColor)) {
635 #endif
636 *alloced = 1;
637 }
638 else {
639 /* do this to work around a problem reported by Frank Ortega */
640 subColor.pixel = (unsigned long) bestmatch;
641 subColor.red = ctable[bestmatch].red;
642 subColor.green = ctable[bestmatch].green;
643 subColor.blue = ctable[bestmatch].blue;
644 subColor.flags = DoRed | DoGreen | DoBlue;
645 *alloced = 0;
646 }
647 #ifdef XFree86Server
648 _mesa_free(ppixIn);
649 _mesa_free(ctable);
650 #else
651 /* don't free table, save it for next time */
652 #endif
653
654 *color = subColor;
655 *exact = 0;
656 }
657
658
659
660 /**
661 * Do setup for PF_GRAYSCALE pixel format.
662 * Note that buffer may be NULL.
663 */
664 static GLboolean
665 setup_grayscale(int client, XMesaVisual v,
666 XMesaBuffer buffer, XMesaColormap cmap)
667 {
668 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
669 return GL_FALSE;
670 }
671
672 if (buffer) {
673 XMesaBuffer prevBuffer;
674
675 if (!cmap) {
676 return GL_FALSE;
677 }
678
679 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
680 if (prevBuffer &&
681 (buffer->xm_visual->mesa_visual.rgbMode ==
682 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
683 /* Copy colormap stuff from previous XMesaBuffer which uses same
684 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
685 */
686 copy_colortable_info(buffer, prevBuffer);
687 }
688 else {
689 /* Allocate 256 shades of gray */
690 int gray;
691 int colorsfailed = 0;
692 for (gray=0;gray<256;gray++) {
693 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
694 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
695 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
696 int exact, alloced;
697 XMesaColor xcol;
698 xcol.red = (r << 8) | r;
699 xcol.green = (g << 8) | g;
700 xcol.blue = (b << 8) | b;
701 noFaultXAllocColor( client, v->display,
702 cmap, GET_COLORMAP_SIZE(v),
703 &xcol, &exact, &alloced );
704 if (!exact) {
705 colorsfailed++;
706 }
707 if (alloced) {
708 assert(buffer->num_alloced<256);
709 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
710 buffer->num_alloced++;
711 }
712
713 /*OLD
714 assert(gray < 576);
715 buffer->color_table[gray*3+0] = xcol.pixel;
716 buffer->color_table[gray*3+1] = xcol.pixel;
717 buffer->color_table[gray*3+2] = xcol.pixel;
718 assert(xcol.pixel < 65536);
719 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
720 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
721 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
722 */
723 buffer->color_table[gray] = xcol.pixel;
724 assert(xcol.pixel < 65536);
725 buffer->pixel_to_r[xcol.pixel] = gray;
726 buffer->pixel_to_g[xcol.pixel] = gray;
727 buffer->pixel_to_b[xcol.pixel] = gray;
728 }
729
730 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
731 _mesa_warning(NULL,
732 "Note: %d out of 256 needed colors do not match exactly.\n",
733 colorsfailed );
734 }
735 }
736 }
737
738 v->dithered_pf = PF_Grayscale;
739 v->undithered_pf = PF_Grayscale;
740 return GL_TRUE;
741 }
742
743
744
745 /**
746 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
747 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
748 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
749 * color. While this function was originally designed just for 8-bit
750 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
751 * Dithering code contributed by Bob Mercier.
752 */
753 static GLboolean
754 setup_dithered_color(int client, XMesaVisual v,
755 XMesaBuffer buffer, XMesaColormap cmap)
756 {
757 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
758 return GL_FALSE;
759 }
760
761 if (buffer) {
762 XMesaBuffer prevBuffer;
763
764 if (!cmap) {
765 return GL_FALSE;
766 }
767
768 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
769 if (prevBuffer &&
770 (buffer->xm_visual->mesa_visual.rgbMode ==
771 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
772 /* Copy colormap stuff from previous, matching XMesaBuffer.
773 * Do this to avoid time spent in noFaultXAllocColor.
774 */
775 copy_colortable_info(buffer, prevBuffer);
776 }
777 else {
778 /* Allocate X colors and initialize color_table[], red_table[], etc */
779 int r, g, b, i;
780 int colorsfailed = 0;
781 for (r = 0; r < DITH_R; r++) {
782 for (g = 0; g < DITH_G; g++) {
783 for (b = 0; b < DITH_B; b++) {
784 XMesaColor xcol;
785 int exact, alloced;
786 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
787 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
788 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
789 noFaultXAllocColor( client, v->display,
790 cmap, GET_COLORMAP_SIZE(v),
791 &xcol, &exact, &alloced );
792 if (!exact) {
793 colorsfailed++;
794 }
795 if (alloced) {
796 assert(buffer->num_alloced<256);
797 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
798 buffer->num_alloced++;
799 }
800 i = DITH_MIX( r, g, b );
801 assert(i < 576);
802 buffer->color_table[i] = xcol.pixel;
803 assert(xcol.pixel < 65536);
804 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
805 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
806 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
807 }
808 }
809 }
810
811 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
812 _mesa_warning(NULL,
813 "Note: %d out of %d needed colors do not match exactly.\n",
814 colorsfailed, DITH_R * DITH_G * DITH_B );
815 }
816 }
817 }
818
819 v->dithered_pf = PF_Dither;
820 v->undithered_pf = PF_Lookup;
821 return GL_TRUE;
822 }
823
824
825 /**
826 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
827 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
828 * Special dithering tables have to be initialized.
829 */
830 static void
831 setup_8bit_hpcr(XMesaVisual v)
832 {
833 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
834 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
835 * on the root window AND the colormap obtainable by XGetRGBColormaps
836 * for that atom must be set on the window. (see also tkInitWindow)
837 * If that colormap is not set, the output will look stripy.
838 */
839
840 /* Setup color tables with gamma correction */
841 int i;
842 double g;
843
844 g = 1.0 / v->RedGamma;
845 for (i=0; i<256; i++) {
846 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
847 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
848 }
849
850 g = 1.0 / v->GreenGamma;
851 for (i=0; i<256; i++) {
852 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
853 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
854 }
855
856 g = 1.0 / v->BlueGamma;
857 for (i=0; i<256; i++) {
858 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
859 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
860 }
861 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
862 v->dithered_pf = PF_HPCR;
863
864 /* which method should I use to clear */
865 /* GL_FALSE: keep the ordinary method */
866 /* GL_TRUE : clear with dither pattern */
867 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
868
869 if (v->hpcr_clear_flag) {
870 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
871 DefaultRootWindow(v->display),
872 16, 2, 8);
873 #ifndef XFree86Server
874 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
875 0, 0, 16, 2, AllPlanes, ZPixmap);
876 #endif
877 }
878 }
879
880
881 /**
882 * Setup RGB rendering for a window with a True/DirectColor visual.
883 */
884 static void
885 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
886 {
887 unsigned long rmask, gmask, bmask;
888 (void) buffer;
889 (void) cmap;
890
891 /* Compute red multiplier (mask) and bit shift */
892 v->rshift = 0;
893 rmask = GET_REDMASK(v);
894 while ((rmask & 1)==0) {
895 v->rshift++;
896 rmask = rmask >> 1;
897 }
898
899 /* Compute green multiplier (mask) and bit shift */
900 v->gshift = 0;
901 gmask = GET_GREENMASK(v);
902 while ((gmask & 1)==0) {
903 v->gshift++;
904 gmask = gmask >> 1;
905 }
906
907 /* Compute blue multiplier (mask) and bit shift */
908 v->bshift = 0;
909 bmask = GET_BLUEMASK(v);
910 while ((bmask & 1)==0) {
911 v->bshift++;
912 bmask = bmask >> 1;
913 }
914
915 /*
916 * Compute component-to-pixel lookup tables and dithering kernel
917 */
918 {
919 static GLubyte kernel[16] = {
920 0*16, 8*16, 2*16, 10*16,
921 12*16, 4*16, 14*16, 6*16,
922 3*16, 11*16, 1*16, 9*16,
923 15*16, 7*16, 13*16, 5*16,
924 };
925 GLint rBits = _mesa_bitcount(rmask);
926 GLint gBits = _mesa_bitcount(gmask);
927 GLint bBits = _mesa_bitcount(bmask);
928 GLint maxBits;
929 GLuint i;
930
931 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
932 for (i=0; i<=rmask; i++)
933 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
934 for (i=0; i<=gmask; i++)
935 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
936 for (i=0; i<=bmask; i++)
937 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
938
939 /* convert RGB values from [0,255] to pixel components */
940
941 for (i=0;i<256;i++) {
942 GLint r = gamma_adjust(v->RedGamma, i, 255);
943 GLint g = gamma_adjust(v->GreenGamma, i, 255);
944 GLint b = gamma_adjust(v->BlueGamma, i, 255);
945 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
946 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
947 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
948 }
949 /* overflow protection */
950 for (i=256;i<512;i++) {
951 v->RtoPixel[i] = v->RtoPixel[255];
952 v->GtoPixel[i] = v->GtoPixel[255];
953 v->BtoPixel[i] = v->BtoPixel[255];
954 }
955
956 /* setup dithering kernel */
957 maxBits = rBits;
958 if (gBits > maxBits) maxBits = gBits;
959 if (bBits > maxBits) maxBits = bBits;
960 for (i=0;i<16;i++) {
961 v->Kernel[i] = kernel[i] >> maxBits;
962 }
963
964 v->undithered_pf = PF_Truecolor;
965 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
966 }
967
968 /*
969 * Now check for TrueColor visuals which we can optimize.
970 */
971 if ( GET_REDMASK(v) ==0x0000ff
972 && GET_GREENMASK(v)==0x00ff00
973 && GET_BLUEMASK(v) ==0xff0000
974 && CHECK_BYTE_ORDER(v)
975 && v->BitsPerPixel==32
976 && sizeof(GLuint)==4
977 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
978 /* common 32 bpp config used on SGI, Sun */
979 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
980 }
981 else if (GET_REDMASK(v) ==0xff0000
982 && GET_GREENMASK(v)==0x00ff00
983 && GET_BLUEMASK(v) ==0x0000ff
984 && CHECK_BYTE_ORDER(v)
985 && v->BitsPerPixel==32
986 && sizeof(GLuint)==4
987 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
988 /* common 32 bpp config used on Linux, HP, IBM */
989 if (GET_VISUAL_DEPTH(v)==32)
990 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B;
991 else
992 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
993 }
994 else if (GET_REDMASK(v) ==0xff0000
995 && GET_GREENMASK(v)==0x00ff00
996 && GET_BLUEMASK(v) ==0x0000ff
997 && CHECK_BYTE_ORDER(v)
998 && v->BitsPerPixel==24
999 && sizeof(GLuint)==4
1000 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1001 /* common packed 24 bpp config used on Linux */
1002 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1003 }
1004 else if (GET_REDMASK(v) ==0xf800
1005 && GET_GREENMASK(v)==0x07e0
1006 && GET_BLUEMASK(v) ==0x001f
1007 && CHECK_BYTE_ORDER(v)
1008 && v->BitsPerPixel==16
1009 && sizeof(GLushort)==2
1010 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1011 /* 5-6-5 color weight on common PC VGA boards */
1012 v->undithered_pf = PF_5R6G5B;
1013 v->dithered_pf = PF_Dither_5R6G5B;
1014 }
1015 else if (GET_REDMASK(v) ==0xe0
1016 && GET_GREENMASK(v)==0x1c
1017 && GET_BLUEMASK(v) ==0x03
1018 && CHECK_FOR_HPCR(v)) {
1019 setup_8bit_hpcr( v );
1020 }
1021 }
1022
1023
1024
1025 /**
1026 * Setup RGB rendering for a window with a monochrome visual.
1027 */
1028 static void
1029 setup_monochrome( XMesaVisual v, XMesaBuffer b )
1030 {
1031 (void) b;
1032 v->dithered_pf = v->undithered_pf = PF_1Bit;
1033 /* if black=1 then we must flip pixel values */
1034 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1035 }
1036
1037
1038
1039 /**
1040 * When a context is bound for the first time, we can finally finish
1041 * initializing the context's visual and buffer information.
1042 * \param v the XMesaVisual to initialize
1043 * \param b the XMesaBuffer to initialize (may be NULL)
1044 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
1045 * \param window the window/pixmap we're rendering into
1046 * \param cmap the colormap associated with the window/pixmap
1047 * \return GL_TRUE=success, GL_FALSE=failure
1048 */
1049 static GLboolean
1050 initialize_visual_and_buffer(int client, XMesaVisual v, XMesaBuffer b,
1051 GLboolean rgb_flag, XMesaDrawable window,
1052 XMesaColormap cmap)
1053 {
1054 ASSERT(!b || b->xm_visual == v);
1055
1056 /* Save true bits/pixel */
1057 v->BitsPerPixel = bits_per_pixel(v);
1058 assert(v->BitsPerPixel > 0);
1059
1060 if (rgb_flag == GL_FALSE) {
1061 /* COLOR-INDEXED WINDOW:
1062 * Even if the visual is TrueColor or DirectColor we treat it as
1063 * being color indexed. This is weird but might be useful to someone.
1064 */
1065 v->dithered_pf = v->undithered_pf = PF_Index;
1066 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1067 }
1068 else {
1069 /* RGB WINDOW:
1070 * We support RGB rendering into almost any kind of visual.
1071 */
1072 const int xclass = v->mesa_visual.visualType;
1073 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1074 setup_truecolor( v, b, cmap );
1075 }
1076 else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1077 setup_monochrome( v, b );
1078 }
1079 else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1080 if (!setup_grayscale( client, v, b, cmap )) {
1081 return GL_FALSE;
1082 }
1083 }
1084 else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1085 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1086 if (!setup_dithered_color( client, v, b, cmap )) {
1087 return GL_FALSE;
1088 }
1089 }
1090 else {
1091 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1092 return GL_FALSE;
1093 }
1094 v->mesa_visual.indexBits = 0;
1095
1096 if (_mesa_getenv("MESA_NO_DITHER")) {
1097 v->dithered_pf = v->undithered_pf;
1098 }
1099 }
1100
1101
1102 /*
1103 * If MESA_INFO env var is set print out some debugging info
1104 * which can help Brian figure out what's going on when a user
1105 * reports bugs.
1106 */
1107 if (_mesa_getenv("MESA_INFO")) {
1108 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1109 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1110 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1111 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1112 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1113 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1114 }
1115
1116 if (b && window) {
1117 /* Do window-specific initializations */
1118
1119 /* these should have been set in create_xmesa_buffer */
1120 ASSERT(b->frontxrb->drawable == window);
1121 ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1122
1123 /* Setup for single/double buffering */
1124 if (v->mesa_visual.doubleBufferMode) {
1125 /* Double buffered */
1126 b->shm = check_for_xshm( v->display );
1127 }
1128
1129 /* X11 graphics contexts */
1130 #ifdef XFree86Server
1131 b->gc = CreateScratchGC(v->display, window->depth);
1132 #else
1133 b->gc = XCreateGC( v->display, window, 0, NULL );
1134 #endif
1135 XMesaSetFunction( v->display, b->gc, GXcopy );
1136
1137 /* cleargc - for glClear() */
1138 #ifdef XFree86Server
1139 b->cleargc = CreateScratchGC(v->display, window->depth);
1140 #else
1141 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1142 #endif
1143 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1144
1145 /*
1146 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1147 * Patch contributed by Michael Pichler May 15, 1995.
1148 */
1149 #ifdef XFree86Server
1150 b->swapgc = CreateScratchGC(v->display, window->depth);
1151 {
1152 CARD32 v[1];
1153 v[0] = FALSE;
1154 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1155 }
1156 #else
1157 {
1158 XGCValues gcvalues;
1159 gcvalues.graphics_exposures = False;
1160 b->swapgc = XCreateGC(v->display, window,
1161 GCGraphicsExposures, &gcvalues);
1162 }
1163 #endif
1164 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1165 /*
1166 * Set fill style and tile pixmap once for all for HPCR stuff
1167 * (instead of doing it each time in clear_color_HPCR_pixmap())
1168 * Initialize whole stuff
1169 * Patch contributed by Jacques Leroy March 8, 1998.
1170 */
1171 if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1172 int i;
1173 for (i = 0; i < 16; i++) {
1174 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1175 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1176 }
1177 XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1178 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1179 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1180 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1181 }
1182
1183 /* Initialize the row buffer XImage for use in write_color_span() */
1184 #ifdef XFree86Server
1185 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1186 (char *)MALLOC(MAX_WIDTH*4));
1187 #else
1188 b->rowimage = XCreateImage( v->display,
1189 v->visinfo->visual,
1190 v->visinfo->depth,
1191 ZPixmap, 0, /*format, offset*/
1192 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1193 MAX_WIDTH, 1, /*width, height*/
1194 32, /*bitmap_pad*/
1195 0 /*bytes_per_line*/ );
1196 #endif
1197 if (!b->rowimage)
1198 return GL_FALSE;
1199 }
1200
1201 return GL_TRUE;
1202 }
1203
1204
1205
1206 /*
1207 * Convert an RGBA color to a pixel value.
1208 */
1209 unsigned long
1210 xmesa_color_to_pixel(GLcontext *ctx,
1211 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1212 GLuint pixelFormat)
1213 {
1214 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1215 switch (pixelFormat) {
1216 case PF_Index:
1217 return 0;
1218 case PF_Truecolor:
1219 {
1220 unsigned long p;
1221 PACK_TRUECOLOR( p, r, g, b );
1222 return p;
1223 }
1224 case PF_8A8B8G8R:
1225 return PACK_8A8B8G8R( r, g, b, a );
1226 case PF_8A8R8G8B:
1227 return PACK_8A8R8G8B( r, g, b, a );
1228 case PF_8R8G8B:
1229 /* fall through */
1230 case PF_8R8G8B24:
1231 return PACK_8R8G8B( r, g, b );
1232 case PF_5R6G5B:
1233 return PACK_5R6G5B( r, g, b );
1234 case PF_Dither:
1235 {
1236 DITHER_SETUP;
1237 return DITHER( 1, 0, r, g, b );
1238 }
1239 case PF_1Bit:
1240 /* 382 = (3*255)/2 */
1241 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1242 case PF_HPCR:
1243 return DITHER_HPCR(1, 1, r, g, b);
1244 case PF_Lookup:
1245 {
1246 LOOKUP_SETUP;
1247 return LOOKUP( r, g, b );
1248 }
1249 case PF_Grayscale:
1250 return GRAY_RGB( r, g, b );
1251 case PF_Dither_True:
1252 /* fall through */
1253 case PF_Dither_5R6G5B:
1254 {
1255 unsigned long p;
1256 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1257 return p;
1258 }
1259 default:
1260 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1261 }
1262 return 0;
1263 }
1264
1265
1266 #define NUM_VISUAL_TYPES 6
1267
1268 /**
1269 * Convert an X visual type to a GLX visual type.
1270 *
1271 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1272 * to be converted.
1273 * \return If \c visualType is a valid X visual type, a GLX visual type will
1274 * be returned. Otherwise \c GLX_NONE will be returned.
1275 *
1276 * \note
1277 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1278 * DRI CVS tree.
1279 */
1280 static GLint
1281 xmesa_convert_from_x_visual_type( int visualType )
1282 {
1283 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1284 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1285 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1286 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1287 };
1288
1289 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1290 ? glx_visual_types[ visualType ] : GLX_NONE;
1291 }
1292
1293
1294 /**********************************************************************/
1295 /***** Public Functions *****/
1296 /**********************************************************************/
1297
1298
1299 /*
1300 * Create a new X/Mesa visual.
1301 * Input: display - X11 display
1302 * visinfo - an XVisualInfo pointer
1303 * rgb_flag - GL_TRUE = RGB mode,
1304 * GL_FALSE = color index mode
1305 * alpha_flag - alpha buffer requested?
1306 * db_flag - GL_TRUE = double-buffered,
1307 * GL_FALSE = single buffered
1308 * stereo_flag - stereo visual?
1309 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1310 * GL_FALSE = use an off-screen pixmap for back buffer
1311 * depth_size - requested bits/depth values, or zero
1312 * stencil_size - requested bits/stencil values, or zero
1313 * accum_red_size - requested bits/red accum values, or zero
1314 * accum_green_size - requested bits/green accum values, or zero
1315 * accum_blue_size - requested bits/blue accum values, or zero
1316 * accum_alpha_size - requested bits/alpha accum values, or zero
1317 * num_samples - number of samples/pixel if multisampling, or zero
1318 * level - visual level, usually 0
1319 * visualCaveat - ala the GLX extension, usually GLX_NONE
1320 * Return; a new XMesaVisual or 0 if error.
1321 */
1322 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1323 XMesaVisualInfo visinfo,
1324 GLboolean rgb_flag,
1325 GLboolean alpha_flag,
1326 GLboolean db_flag,
1327 GLboolean stereo_flag,
1328 GLboolean ximage_flag,
1329 GLint depth_size,
1330 GLint stencil_size,
1331 GLint accum_red_size,
1332 GLint accum_green_size,
1333 GLint accum_blue_size,
1334 GLint accum_alpha_size,
1335 GLint num_samples,
1336 GLint level,
1337 GLint visualCaveat )
1338 {
1339 char *gamma;
1340 XMesaVisual v;
1341 GLint red_bits, green_bits, blue_bits, alpha_bits;
1342
1343 #ifndef XFree86Server
1344 /* For debugging only */
1345 if (_mesa_getenv("MESA_XSYNC")) {
1346 /* This makes debugging X easier.
1347 * In your debugger, set a breakpoint on _XError to stop when an
1348 * X protocol error is generated.
1349 */
1350 XSynchronize( display, 1 );
1351 }
1352 #endif
1353
1354 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1355 if (!v) {
1356 return NULL;
1357 }
1358
1359 /*
1360 * In the X server, NULL is passed in for the display. It will have
1361 * to be set before using this visual. See XMesaSetVisualDisplay()
1362 * below.
1363 */
1364 v->display = display;
1365
1366 /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1367 * the struct but we may need some of the information contained in it
1368 * at a later time.
1369 */
1370 #ifndef XFree86Server
1371 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1372 if(!v->visinfo) {
1373 _mesa_free(v);
1374 return NULL;
1375 }
1376 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1377 #endif
1378
1379 /* check for MESA_GAMMA environment variable */
1380 gamma = _mesa_getenv("MESA_GAMMA");
1381 if (gamma) {
1382 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1383 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1384 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1385 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1386 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1387 }
1388 else {
1389 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1390 }
1391
1392 v->ximage_flag = ximage_flag;
1393
1394 #ifdef XFree86Server
1395 /* We could calculate these values by ourselves. nplanes is either the sum
1396 * of the red, green, and blue bits or the number index bits.
1397 * ColormapEntries is either (1U << index_bits) or
1398 * (1U << max(redBits, greenBits, blueBits)).
1399 */
1400 assert(visinfo->nplanes > 0);
1401 v->nplanes = visinfo->nplanes;
1402 v->ColormapEntries = visinfo->ColormapEntries;
1403
1404 v->mesa_visual.redMask = visinfo->redMask;
1405 v->mesa_visual.greenMask = visinfo->greenMask;
1406 v->mesa_visual.blueMask = visinfo->blueMask;
1407 v->mesa_visual.visualID = visinfo->vid;
1408 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1409 #else
1410 v->mesa_visual.redMask = visinfo->red_mask;
1411 v->mesa_visual.greenMask = visinfo->green_mask;
1412 v->mesa_visual.blueMask = visinfo->blue_mask;
1413 v->mesa_visual.visualID = visinfo->visualid;
1414 v->mesa_visual.screen = visinfo->screen;
1415 #endif
1416
1417 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1418 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1419 #else
1420 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1421 #endif
1422
1423 v->mesa_visual.visualRating = visualCaveat;
1424
1425 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1426
1427 {
1428 const int xclass = v->mesa_visual.visualType;
1429 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1430 red_bits = _mesa_bitcount(GET_REDMASK(v));
1431 green_bits = _mesa_bitcount(GET_GREENMASK(v));
1432 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
1433 alpha_bits = 0;
1434 }
1435 else {
1436 /* this is an approximation */
1437 int depth;
1438 depth = GET_VISUAL_DEPTH(v);
1439 red_bits = depth / 3;
1440 depth -= red_bits;
1441 green_bits = depth / 2;
1442 depth -= green_bits;
1443 blue_bits = depth;
1444 alpha_bits = 0;
1445 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1446 }
1447 }
1448
1449 if (alpha_flag && alpha_bits == 0)
1450 alpha_bits = 8;
1451
1452 _mesa_initialize_visual( &v->mesa_visual,
1453 rgb_flag, db_flag, stereo_flag,
1454 red_bits, green_bits,
1455 blue_bits, alpha_bits,
1456 v->mesa_visual.indexBits,
1457 depth_size,
1458 stencil_size,
1459 accum_red_size, accum_green_size,
1460 accum_blue_size, accum_alpha_size,
1461 0 );
1462
1463 /* XXX minor hack */
1464 v->mesa_visual.level = level;
1465 return v;
1466 }
1467
1468
1469 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1470 {
1471 v->display = dpy;
1472 }
1473
1474
1475 void XMesaDestroyVisual( XMesaVisual v )
1476 {
1477 #ifndef XFree86Server
1478 _mesa_free(v->visinfo);
1479 #endif
1480 _mesa_free(v);
1481 }
1482
1483
1484
1485 /**
1486 * Create a new XMesaContext.
1487 * \param v the XMesaVisual
1488 * \param share_list another XMesaContext with which to share display
1489 * lists or NULL if no sharing is wanted.
1490 * \return an XMesaContext or NULL if error.
1491 */
1492 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1493 {
1494 static GLboolean firstTime = GL_TRUE;
1495 XMesaContext c;
1496 GLcontext *mesaCtx;
1497 struct dd_function_table functions;
1498 TNLcontext *tnl;
1499
1500 if (firstTime) {
1501 _glthread_INIT_MUTEX(_xmesa_lock);
1502 firstTime = GL_FALSE;
1503 }
1504
1505 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1506 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1507 if (!c)
1508 return NULL;
1509
1510 mesaCtx = &(c->mesa);
1511
1512 /* initialize with default driver functions, then plug in XMesa funcs */
1513 _mesa_init_driver_functions(&functions);
1514 xmesa_init_driver_functions(v, &functions);
1515 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1516 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1517 &functions, (void *) c)) {
1518 _mesa_free(c);
1519 return NULL;
1520 }
1521
1522 _mesa_enable_sw_extensions(mesaCtx);
1523 _mesa_enable_1_3_extensions(mesaCtx);
1524 _mesa_enable_1_4_extensions(mesaCtx);
1525 _mesa_enable_1_5_extensions(mesaCtx);
1526 _mesa_enable_2_0_extensions(mesaCtx);
1527 #if ENABLE_EXT_texure_compression_s3tc
1528 if (c->Mesa_DXTn) {
1529 _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1530 _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1531 }
1532 _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1533 #endif
1534 #if ENABLE_EXT_timer_query
1535 _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1536 #endif
1537
1538 #ifdef XFree86Server
1539 /* If we're running in the X server, do bounds checking to prevent
1540 * segfaults and server crashes!
1541 */
1542 mesaCtx->Const.CheckArrayBounds = GL_TRUE;
1543 #endif
1544
1545 /* finish up xmesa context initializations */
1546 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1547 c->xm_visual = v;
1548 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1549 c->display = v->display;
1550 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1551
1552 /* Initialize the software rasterizer and helper modules.
1553 */
1554 if (!_swrast_CreateContext( mesaCtx ) ||
1555 !_vbo_CreateContext( mesaCtx ) ||
1556 !_tnl_CreateContext( mesaCtx ) ||
1557 !_swsetup_CreateContext( mesaCtx )) {
1558 _mesa_free_context_data(&c->mesa);
1559 _mesa_free(c);
1560 return NULL;
1561 }
1562
1563 /* tnl setup */
1564 tnl = TNL_CONTEXT(mesaCtx);
1565 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1566 /* swrast setup */
1567 xmesa_register_swrast_functions( mesaCtx );
1568 _swsetup_Wakeup(mesaCtx);
1569
1570 return c;
1571 }
1572
1573
1574
1575 void XMesaDestroyContext( XMesaContext c )
1576 {
1577 GLcontext *mesaCtx = &c->mesa;
1578 #ifdef FX
1579 XMesaBuffer xmbuf = XMESA_BUFFER(mesaCtx->DrawBuffer);
1580
1581 if (xmbuf && xmbuf->FXctx)
1582 fxMesaDestroyContext(xmbuf->FXctx);
1583 #endif
1584 _swsetup_DestroyContext( mesaCtx );
1585 _swrast_DestroyContext( mesaCtx );
1586 _tnl_DestroyContext( mesaCtx );
1587 _vbo_DestroyContext( mesaCtx );
1588 _mesa_free_context_data( mesaCtx );
1589 _mesa_free( c );
1590 }
1591
1592
1593
1594 /**
1595 * Private function for creating an XMesaBuffer which corresponds to an
1596 * X window or pixmap.
1597 * \param v the window's XMesaVisual
1598 * \param w the window we're wrapping
1599 * \param c context used to initialize the buffer if 3Dfx mode in use.
1600 * \return new XMesaBuffer or NULL if error
1601 */
1602 XMesaBuffer
1603 XMesaCreateWindowBuffer2(XMesaVisual v, XMesaWindow w, XMesaContext c)
1604 {
1605 #ifndef XFree86Server
1606 XWindowAttributes attr;
1607 #endif
1608 #ifdef FX
1609 char *fxEnvVar;
1610 #endif
1611 int client = 0;
1612 XMesaBuffer b;
1613 XMesaColormap cmap;
1614
1615 assert(v);
1616 assert(w);
1617 (void) c;
1618
1619 /* Check that window depth matches visual depth */
1620 #ifdef XFree86Server
1621 client = CLIENT_ID(((XMesaDrawable)w)->id);
1622
1623 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1624 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1625 GET_VISUAL_DEPTH(v), ((XMesaDrawable) w)->depth);
1626 return NULL;
1627 }
1628 #else
1629 XGetWindowAttributes( v->display, w, &attr );
1630
1631 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1632 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1633 GET_VISUAL_DEPTH(v), attr.depth);
1634 return NULL;
1635 }
1636 #endif
1637
1638 /* Find colormap */
1639 #ifdef XFree86Server
1640 cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1641 #else
1642 if (attr.colormap) {
1643 cmap = attr.colormap;
1644 }
1645 else {
1646 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1647 /* this is weird, a window w/out a colormap!? */
1648 /* OK, let's just allocate a new one and hope for the best */
1649 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1650 }
1651 #endif
1652
1653 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1654 if (!b)
1655 return NULL;
1656
1657 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1658 (XMesaDrawable) w, cmap )) {
1659 xmesa_free_buffer(b);
1660 return NULL;
1661 }
1662
1663 #ifdef FX
1664 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1665 if (fxEnvVar) {
1666 if (fxEnvVar[0]!='d') {
1667 int attribs[100];
1668 int numAttribs = 0;
1669 int hw;
1670 if (v->mesa_visual.depthBits > 0) {
1671 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1672 attribs[numAttribs++] = v->mesa_visual.depthBits;
1673 }
1674 if (v->mesa_visual.doubleBufferMode) {
1675 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1676 }
1677 if (v->mesa_visual.accumRedBits > 0) {
1678 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1679 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1680 }
1681 if (v->mesa_visual.stencilBits > 0) {
1682 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1683 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1684 }
1685 if (v->mesa_visual.alphaBits > 0) {
1686 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1687 attribs[numAttribs++] = v->mesa_visual.alphaBits;
1688 }
1689 if (1) {
1690 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1691 attribs[numAttribs++] = (int) &(c->mesa);
1692 }
1693 attribs[numAttribs++] = FXMESA_NONE;
1694
1695 /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
1696 hw = fxMesaSelectCurrentBoard(0);
1697
1698 /* if these fail, there's a new bug somewhere */
1699 ASSERT(b->mesa_buffer.Width > 0);
1700 ASSERT(b->mesa_buffer.Height > 0);
1701
1702 if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
1703 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1704 b->mesa_buffer.Height, attribs);
1705 if ((v->undithered_pf!=PF_Index) && (b->backxrb->ximage)) {
1706 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1707 if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
1708 b->FXwindowHack = GL_TRUE;
1709 FX_grSstControl(GR_CONTROL_DEACTIVATE);
1710 }
1711 else {
1712 b->FXwindowHack = GL_FALSE;
1713 }
1714 }
1715 }
1716 else {
1717 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1718 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1719 GR_REFRESH_75Hz, attribs);
1720 else
1721 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1722 b->mesa_buffer.Height, attribs);
1723 b->FXisHackUsable = GL_FALSE;
1724 b->FXwindowHack = GL_FALSE;
1725 }
1726 /*
1727 fprintf(stderr,
1728 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1729 hw, b->mesa_buffer.Width, b->mesa_buffer.Height,
1730 b->FXisHackUsable, b->FXwindowHack);
1731 */
1732 }
1733 }
1734 else {
1735 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1736 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1737 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1738 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1739 }
1740 #endif
1741
1742 return b;
1743 }
1744
1745
1746 XMesaBuffer
1747 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1748 {
1749 return XMesaCreateWindowBuffer2( v, w, NULL );
1750 }
1751
1752
1753 /**
1754 * Create a new XMesaBuffer from an X pixmap.
1755 *
1756 * \param v the XMesaVisual
1757 * \param p the pixmap
1758 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1759 * \c GLX_DIRECT_COLOR visual for the pixmap
1760 * \returns new XMesaBuffer or NULL if error
1761 */
1762 XMesaBuffer
1763 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1764 {
1765 int client = 0;
1766 XMesaBuffer b;
1767
1768 assert(v);
1769
1770 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1771 if (!b)
1772 return NULL;
1773
1774 #ifdef XFree86Server
1775 client = CLIENT_ID(((XMesaDrawable)p)->id);
1776 #endif
1777
1778 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1779 (XMesaDrawable) p, cmap)) {
1780 xmesa_free_buffer(b);
1781 return NULL;
1782 }
1783
1784 return b;
1785 }
1786
1787
1788
1789 XMesaBuffer
1790 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1791 unsigned int width, unsigned int height)
1792 {
1793 #ifdef XFree86Server
1794 return 0;
1795 #else
1796 int client = 0;
1797 XMesaWindow root;
1798 XMesaDrawable drawable; /* X Pixmap Drawable */
1799 XMesaBuffer b;
1800
1801 /* allocate pixmap for front buffer */
1802 root = RootWindow( v->display, v->visinfo->screen );
1803 drawable = XCreatePixmap(v->display, root, width, height,
1804 v->visinfo->depth);
1805 if (!drawable)
1806 return NULL;
1807
1808 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1809 if (!b)
1810 return NULL;
1811
1812 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1813 drawable, cmap)) {
1814 xmesa_free_buffer(b);
1815 return NULL;
1816 }
1817
1818 return b;
1819 #endif
1820 }
1821
1822
1823
1824 /*
1825 * Deallocate an XMesaBuffer structure and all related info.
1826 */
1827 void
1828 XMesaDestroyBuffer(XMesaBuffer b)
1829 {
1830 xmesa_free_buffer(b);
1831 }
1832
1833
1834 /**
1835 * Query the current window size and update the corresponding GLframebuffer
1836 * and all attached renderbuffers.
1837 * Called when:
1838 * 1. the first time a buffer is bound to a context.
1839 * 2. from glViewport to poll for window size changes
1840 * 3. from the XMesaResizeBuffers() API function.
1841 */
1842 void
1843 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1844 {
1845 GLuint width, height;
1846 xmesa_get_window_size(xmctx->display, drawBuffer, &width, &height);
1847 if (drawBuffer->mesa_buffer.Width != width ||
1848 drawBuffer->mesa_buffer.Height != height) {
1849 _mesa_resize_framebuffer(&(xmctx->mesa),
1850 &(drawBuffer->mesa_buffer), width, height);
1851 }
1852 drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1853 }
1854
1855
1856 /*
1857 * Bind buffer b to context c and make c the current rendering context.
1858 */
1859 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1860 {
1861 return XMesaMakeCurrent2( c, b, b );
1862 }
1863
1864
1865 /*
1866 * Bind buffer b to context c and make c the current rendering context.
1867 */
1868 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1869 XMesaBuffer readBuffer )
1870 {
1871 if (c) {
1872 if (!drawBuffer || !readBuffer)
1873 return GL_FALSE; /* must specify buffers! */
1874
1875 #ifdef FX
1876 if (drawBuffer->FXctx) {
1877 fxMesaMakeCurrent(drawBuffer->FXctx);
1878
1879 c->xm_buffer = drawBuffer;
1880
1881 return GL_TRUE;
1882 }
1883 #endif
1884 if (&(c->mesa) == _mesa_get_current_context()
1885 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1886 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1887 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1888 /* same context and buffer, do nothing */
1889 return GL_TRUE;
1890 }
1891
1892 c->xm_buffer = drawBuffer;
1893
1894 /* Call this periodically to detect when the user has begun using
1895 * GL rendering from multiple threads.
1896 */
1897 _glapi_check_multithread();
1898
1899 xmesa_check_and_update_buffer_size(c, drawBuffer);
1900 if (readBuffer != drawBuffer)
1901 xmesa_check_and_update_buffer_size(c, readBuffer);
1902
1903 _mesa_make_current(&(c->mesa),
1904 &drawBuffer->mesa_buffer,
1905 &readBuffer->mesa_buffer);
1906
1907 if (c->xm_visual->mesa_visual.rgbMode) {
1908 /*
1909 * Must recompute and set these pixel values because colormap
1910 * can be different for different windows.
1911 */
1912 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1913 c->clearcolor[0],
1914 c->clearcolor[1],
1915 c->clearcolor[2],
1916 c->clearcolor[3],
1917 c->xm_visual->undithered_pf);
1918 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1919 }
1920
1921 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1922 drawBuffer->wasCurrent = GL_TRUE;
1923 }
1924 else {
1925 /* Detach */
1926 _mesa_make_current( NULL, NULL, NULL );
1927 }
1928 return GL_TRUE;
1929 }
1930
1931
1932 /*
1933 * Unbind the context c from its buffer.
1934 */
1935 GLboolean XMesaUnbindContext( XMesaContext c )
1936 {
1937 /* A no-op for XFree86 integration purposes */
1938 return GL_TRUE;
1939 }
1940
1941
1942 XMesaContext XMesaGetCurrentContext( void )
1943 {
1944 GET_CURRENT_CONTEXT(ctx);
1945 if (ctx) {
1946 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1947 return xmesa;
1948 }
1949 else {
1950 return 0;
1951 }
1952 }
1953
1954
1955 XMesaBuffer XMesaGetCurrentBuffer( void )
1956 {
1957 GET_CURRENT_CONTEXT(ctx);
1958 if (ctx) {
1959 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1960 return xmbuf;
1961 }
1962 else {
1963 return 0;
1964 }
1965 }
1966
1967
1968 /* New in Mesa 3.1 */
1969 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1970 {
1971 GET_CURRENT_CONTEXT(ctx);
1972 if (ctx) {
1973 return XMESA_BUFFER(ctx->ReadBuffer);
1974 }
1975 else {
1976 return 0;
1977 }
1978 }
1979
1980
1981 GLboolean XMesaForceCurrent(XMesaContext c)
1982 {
1983 if (c) {
1984 if (&(c->mesa) != _mesa_get_current_context()) {
1985 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
1986 }
1987 }
1988 else {
1989 _mesa_make_current(NULL, NULL, NULL);
1990 }
1991 return GL_TRUE;
1992 }
1993
1994
1995 GLboolean XMesaLoseCurrent(XMesaContext c)
1996 {
1997 (void) c;
1998 _mesa_make_current(NULL, NULL, NULL);
1999 return GL_TRUE;
2000 }
2001
2002
2003 /*
2004 * Switch 3Dfx support hack between window and full-screen mode.
2005 */
2006 GLboolean XMesaSetFXmode( GLint mode )
2007 {
2008 #ifdef FX
2009 const char *fx = _mesa_getenv("MESA_GLX_FX");
2010 if (fx && fx[0] != 'd') {
2011 GET_CURRENT_CONTEXT(ctx);
2012 GrHwConfiguration hw;
2013 if (!FX_grSstQueryHardware(&hw)) {
2014 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2015 return GL_FALSE;
2016 }
2017 if (hw.num_sst < 1) {
2018 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2019 return GL_FALSE;
2020 }
2021 if (ctx) {
2022 /* [dBorca] Hack alert:
2023 * oh, this is sooo wrong: ctx above is
2024 * really an fxMesaContext, not an XMesaContext
2025 */
2026 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
2027 if (mode == XMESA_FX_WINDOW) {
2028 if (xmbuf->FXisHackUsable) {
2029 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2030 xmbuf->FXwindowHack = GL_TRUE;
2031 return GL_TRUE;
2032 }
2033 }
2034 else if (mode == XMESA_FX_FULLSCREEN) {
2035 FX_grSstControl(GR_CONTROL_ACTIVATE);
2036 xmbuf->FXwindowHack = GL_FALSE;
2037 return GL_TRUE;
2038 }
2039 else {
2040 /* Error: Bad mode value */
2041 }
2042 }
2043 }
2044 /*fprintf(stderr, "fallthrough\n");*/
2045 #else
2046 (void) mode;
2047 #endif
2048 return GL_FALSE;
2049 }
2050
2051
2052
2053 #ifdef FX
2054 /*
2055 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2056 */
2057 static void FXgetImage( XMesaBuffer b )
2058 {
2059 GET_CURRENT_CONTEXT(ctx);
2060 static unsigned short pixbuf[MAX_WIDTH];
2061 GLuint x, y;
2062 GLuint width, height;
2063 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2064
2065 #ifdef XFree86Server
2066 x = b->frontxrb->pixmap->x;
2067 y = b->frontxrb->pixmap->y;
2068 width = b->frontxrb->pixmap->width;
2069 height = b->frontxrb->pixmap->height;
2070 depth = b->frontxrb->pixmap->depth;
2071 #else
2072 xmesa_get_window_size(b->display, b, &width, &height);
2073 x = y = 0;
2074 #endif
2075 if (b->mesa_buffer.Width != width || b->mesa_buffer.Height != height) {
2076 b->mesa_buffer.Width = MIN2((int)width, b->FXctx->width);
2077 b->mesa_buffer.Height = MIN2((int)height, b->FXctx->height);
2078 if (b->mesa_buffer.Width & 1)
2079 b->mesa_buffer.Width--; /* prevent odd width */
2080 }
2081
2082 /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
2083 /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
2084 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2085 /* Special case: 16bpp RGB */
2086 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2087 0, b->FXctx->height - b->mesa_buffer.Height, /*pos*/
2088 b->mesa_buffer.Width, b->mesa_buffer.Height, /* size */
2089 b->mesa_buffer.Width * sizeof(GLushort), /* stride */
2090 b->backxrb->ximage->data); /* dest buffer */
2091 }
2092 else if (b->xm_visual->dithered_pf==PF_Dither
2093 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2094 /* Special case: 8bpp RGB */
2095 for (y=0;y<b->mesa_buffer.Height;y++) {
2096 GLubyte *ptr = (GLubyte*) b->backxrb->ximage->data
2097 + b->backxrb->ximage->bytes_per_line * y;
2098 XDITHER_SETUP(y);
2099
2100 /* read row from 3Dfx frame buffer */
2101 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2102 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2103 b->mesa_buffer.Width, 1,
2104 0,
2105 pixbuf );
2106
2107 /* write to XImage back buffer */
2108 for (x=0;x<b->mesa_buffer.Width;x++) {
2109 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2110 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2111 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2112 *ptr++ = XDITHER( x, r, g, b);
2113 }
2114 }
2115 }
2116 else {
2117 /* General case: slow! */
2118 for (y=0;y<b->mesa_buffer.Height;y++) {
2119 /* read row from 3Dfx frame buffer */
2120 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2121 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2122 b->mesa_buffer.Width, 1,
2123 0,
2124 pixbuf );
2125
2126 /* write to XImage back buffer */
2127 for (x=0;x<b->mesa_buffer.Width;x++) {
2128 XMesaPutPixel(b->backxrb->ximage,x,y,
2129 xmesa_color_to_pixel(ctx,
2130 (pixbuf[x] & 0xf800) >> 8,
2131 (pixbuf[x] & 0x07e0) >> 3,
2132 (pixbuf[x] & 0x001f) << 3,
2133 0xff,
2134 b->xm_visual->undithered_pf));
2135 }
2136 }
2137 }
2138 /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
2139 }
2140 #endif
2141
2142
2143 /*
2144 * Copy the back buffer to the front buffer. If there's no back buffer
2145 * this is a no-op.
2146 */
2147 void XMesaSwapBuffers( XMesaBuffer b )
2148 {
2149 GET_CURRENT_CONTEXT(ctx);
2150
2151 if (!b->backxrb) {
2152 /* single buffered */
2153 return;
2154 }
2155
2156 /* If we're swapping the buffer associated with the current context
2157 * we have to flush any pending rendering commands first.
2158 */
2159 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2160 _mesa_notifySwapBuffers(ctx);
2161
2162 if (b->db_mode) {
2163 #ifdef FX
2164 if (b->FXctx) {
2165 fxMesaSwapBuffers();
2166
2167 if (b->FXwindowHack)
2168 FXgetImage(b);
2169 else
2170 return;
2171 }
2172 #endif
2173 if (b->backxrb->ximage) {
2174 /* Copy Ximage from host's memory to server's window */
2175 #if defined(USE_XSHM) && !defined(XFree86Server)
2176 if (b->shm) {
2177 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2178 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2179 b->swapgc,
2180 b->backxrb->ximage, 0, 0,
2181 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2182 False );
2183 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2184 }
2185 else
2186 #endif
2187 {
2188 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2189 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2190 b->swapgc,
2191 b->backxrb->ximage, 0, 0,
2192 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2193 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2194 }
2195 }
2196 else {
2197 /* Copy pixmap to window on server */
2198 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2199 XMesaCopyArea( b->xm_visual->display,
2200 b->backxrb->pixmap, /* source drawable */
2201 b->frontxrb->drawable, /* dest. drawable */
2202 b->swapgc,
2203 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2204 0, 0 /* dest region */
2205 );
2206 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2207 }
2208 }
2209 #if !defined(XFree86Server)
2210 XSync( b->xm_visual->display, False );
2211 #endif
2212 }
2213
2214
2215
2216 /*
2217 * Copy sub-region of back buffer to front buffer
2218 */
2219 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2220 {
2221 GET_CURRENT_CONTEXT(ctx);
2222
2223 /* If we're swapping the buffer associated with the current context
2224 * we have to flush any pending rendering commands first.
2225 */
2226 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2227 _mesa_notifySwapBuffers(ctx);
2228
2229 if (!b->backxrb) {
2230 /* single buffered */
2231 return;
2232 }
2233
2234 if (b->db_mode) {
2235 int yTop = b->mesa_buffer.Height - y - height;
2236 #ifdef FX
2237 if (b->FXctx) {
2238 fxMesaSwapBuffers();
2239 if (b->FXwindowHack)
2240 FXgetImage(b);
2241 else
2242 return;
2243 }
2244 #endif
2245 if (b->backxrb->ximage) {
2246 /* Copy Ximage from host's memory to server's window */
2247 #if defined(USE_XSHM) && !defined(XFree86Server)
2248 if (b->shm) {
2249 /* XXX assuming width and height aren't too large! */
2250 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2251 b->swapgc,
2252 b->backxrb->ximage, x, yTop,
2253 x, yTop, width, height, False );
2254 /* wait for finished event??? */
2255 }
2256 else
2257 #endif
2258 {
2259 /* XXX assuming width and height aren't too large! */
2260 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2261 b->swapgc,
2262 b->backxrb->ximage, x, yTop,
2263 x, yTop, width, height );
2264 }
2265 }
2266 else {
2267 /* Copy pixmap to window on server */
2268 XMesaCopyArea( b->xm_visual->display,
2269 b->backxrb->pixmap, /* source drawable */
2270 b->frontxrb->drawable, /* dest. drawable */
2271 b->swapgc,
2272 x, yTop, width, height, /* source region */
2273 x, yTop /* dest region */
2274 );
2275 }
2276 }
2277 }
2278
2279
2280 /*
2281 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2282 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2283 * back buffer directly.
2284 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2285 * ximage - pointer to back buffer's XImage, or NULL
2286 * Return: GL_TRUE = context is double buffered
2287 * GL_FALSE = context is single buffered
2288 */
2289 #ifndef XFree86Server
2290 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2291 XMesaPixmap *pixmap,
2292 XMesaImage **ximage )
2293 {
2294 if (b->db_mode) {
2295 if (pixmap)
2296 *pixmap = b->backxrb->pixmap;
2297 if (ximage)
2298 *ximage = b->backxrb->ximage;
2299 return GL_TRUE;
2300 }
2301 else {
2302 *pixmap = 0;
2303 *ximage = NULL;
2304 return GL_FALSE;
2305 }
2306 }
2307 #endif /* XFree86Server */
2308
2309
2310 /*
2311 * Return the depth buffer associated with an XMesaBuffer.
2312 * Input: b - the XMesa buffer handle
2313 * Output: width, height - size of buffer in pixels
2314 * bytesPerValue - bytes per depth value (2 or 4)
2315 * buffer - pointer to depth buffer values
2316 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2317 */
2318 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2319 GLint *bytesPerValue, void **buffer )
2320 {
2321 struct gl_renderbuffer *rb
2322 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2323 if (!rb || !rb->Data) {
2324 *width = 0;
2325 *height = 0;
2326 *bytesPerValue = 0;
2327 *buffer = 0;
2328 return GL_FALSE;
2329 }
2330 else {
2331 *width = b->mesa_buffer.Width;
2332 *height = b->mesa_buffer.Height;
2333 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2334 ? sizeof(GLushort) : sizeof(GLuint);
2335 *buffer = rb->Data;
2336 return GL_TRUE;
2337 }
2338 }
2339
2340
2341 void XMesaFlush( XMesaContext c )
2342 {
2343 if (c && c->xm_visual) {
2344 #ifdef XFree86Server
2345 /* NOT_NEEDED */
2346 #else
2347 XSync( c->xm_visual->display, False );
2348 #endif
2349 }
2350 }
2351
2352
2353
2354 const char *XMesaGetString( XMesaContext c, int name )
2355 {
2356 (void) c;
2357 if (name==XMESA_VERSION) {
2358 return "5.0";
2359 }
2360 else if (name==XMESA_EXTENSIONS) {
2361 return "";
2362 }
2363 else {
2364 return NULL;
2365 }
2366 }
2367
2368
2369
2370 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2371 {
2372 XMesaBuffer b;
2373 for (b=XMesaBufferList; b; b=b->Next) {
2374 if (b->frontxrb->drawable == d && b->display == dpy) {
2375 return b;
2376 }
2377 }
2378 return NULL;
2379 }
2380
2381
2382 /**
2383 * Free/destroy all XMesaBuffers associated with given display.
2384 */
2385 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2386 {
2387 XMesaBuffer b, next;
2388 for (b = XMesaBufferList; b; b = next) {
2389 next = b->Next;
2390 if (b->display == dpy) {
2391 xmesa_free_buffer(b);
2392 }
2393 }
2394 }
2395
2396
2397 /*
2398 * Look for XMesaBuffers whose X window has been destroyed.
2399 * Deallocate any such XMesaBuffers.
2400 */
2401 void XMesaGarbageCollect( void )
2402 {
2403 XMesaBuffer b, next;
2404 for (b=XMesaBufferList; b; b=next) {
2405 next = b->Next;
2406 if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2407 #ifdef XFree86Server
2408 /* NOT_NEEDED */
2409 #else
2410 XSync(b->display, False);
2411 if (!window_exists( b->display, b->frontxrb->drawable )) {
2412 /* found a dead window, free the ancillary info */
2413 XMesaDestroyBuffer( b );
2414 }
2415 #endif
2416 }
2417 }
2418 }
2419
2420
2421 void XMesaReset( void )
2422 {
2423 while (XMesaBufferList)
2424 XMesaDestroyBuffer(XMesaBufferList);
2425
2426 XMesaBufferList = NULL;
2427 }
2428
2429
2430 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2431 GLfloat red, GLfloat green,
2432 GLfloat blue, GLfloat alpha )
2433 {
2434 GLcontext *ctx = &xmesa->mesa;
2435 GLint r = (GLint) (red * 255.0F);
2436 GLint g = (GLint) (green * 255.0F);
2437 GLint b = (GLint) (blue * 255.0F);
2438 GLint a = (GLint) (alpha * 255.0F);
2439
2440 switch (xmesa->pixelformat) {
2441 case PF_Index:
2442 return 0;
2443 case PF_Truecolor:
2444 {
2445 unsigned long p;
2446 PACK_TRUECOLOR( p, r, g, b );
2447 return p;
2448 }
2449 case PF_8A8B8G8R:
2450 return PACK_8A8B8G8R( r, g, b, a );
2451 case PF_8A8R8G8B:
2452 return PACK_8A8R8G8B( r, g, b, a );
2453 case PF_8R8G8B:
2454 return PACK_8R8G8B( r, g, b );
2455 case PF_5R6G5B:
2456 return PACK_5R6G5B( r, g, b );
2457 case PF_Dither:
2458 {
2459 DITHER_SETUP;
2460 return DITHER( x, y, r, g, b );
2461 }
2462 case PF_1Bit:
2463 /* 382 = (3*255)/2 */
2464 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2465 case PF_HPCR:
2466 return DITHER_HPCR(x, y, r, g, b);
2467 case PF_Lookup:
2468 {
2469 LOOKUP_SETUP;
2470 return LOOKUP( r, g, b );
2471 }
2472 case PF_Grayscale:
2473 return GRAY_RGB( r, g, b );
2474 case PF_Dither_5R6G5B:
2475 /* fall through */
2476 case PF_Dither_True:
2477 {
2478 unsigned long p;
2479 PACK_TRUEDITHER(p, x, y, r, g, b);
2480 return p;
2481 }
2482 default:
2483 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2484 }
2485 return 0;
2486 }
2487
2488
2489 /*
2490 * This is typically called when the window size changes and we need
2491 * to reallocate the buffer's back/depth/stencil/accum buffers.
2492 */
2493 void
2494 XMesaResizeBuffers( XMesaBuffer b )
2495 {
2496 GET_CURRENT_CONTEXT(ctx);
2497 XMesaContext xmctx = XMESA_CONTEXT(ctx);
2498 xmesa_check_and_update_buffer_size(xmctx, b);
2499 }
2500