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Split driver struct into swrast/tnl/core components.
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /* $Id: xm_api.c,v 1.19 2001/03/19 02:25:36 keithw Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 3.5
6 *
7 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27
28 /*
29 * This file contains the implementations of all the XMesa* functions.
30 *
31 *
32 * NOTES:
33 *
34 * The window coordinate system origin (0,0) is in the lower-left corner
35 * of the window. X11's window coordinate origin is in the upper-left
36 * corner of the window. Therefore, most drawing functions in this
37 * file have to flip Y coordinates.
38 *
39 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
40 * in support for the MIT Shared Memory extension. If enabled, when you
41 * use an Ximage for the back buffer in double buffered mode, the "swap"
42 * operation will be faster. You must also link with -lXext.
43 *
44 * Byte swapping: If the Mesa host and the X display use a different
45 * byte order then there's some trickiness to be aware of when using
46 * XImages. The byte ordering used for the XImage is that of the X
47 * display, not the Mesa host.
48 * The color-to-pixel encoding for True/DirectColor must be done
49 * according to the display's visual red_mask, green_mask, and blue_mask.
50 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
51 * do byte swapping if needed. If one wants to directly "poke" the pixel
52 * into the XImage's buffer then the pixel must be byte swapped first. In
53 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
54 * and use XPutPixel everywhere except in the implementation of
55 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
56 * instead of using XPutPixel we "poke" our values after byte-swapping
57 * the clear pixel value if needed.
58 *
59 */
60
61 #ifdef __CYGWIN__
62 #undef WIN32
63 #undef __WIN32__
64 #endif
65
66 #include "glxheader.h"
67 #include "GL/xmesa.h"
68 #include "xmesaP.h"
69 #include "context.h"
70 #include "extensions.h"
71 #include "glthread.h"
72 #include "matrix.h"
73 #include "mem.h"
74 #include "mtypes.h"
75 #ifdef HAVE_CONFIG_H
76 #include "conf.h"
77 #endif
78 #include "macros.h"
79 #include "swrast/swrast.h"
80 #include "swrast_setup/swrast_setup.h"
81 #include "array_cache/acache.h"
82 #include "tnl/tnl.h"
83
84 #ifndef GLX_NONE_EXT
85 #define GLX_NONE_EXT 0x8000
86 #endif
87
88
89 /*
90 * Global X driver lock
91 */
92 _glthread_Mutex _xmesa_lock;
93
94
95
96 /*
97 * Lookup tables for HPCR pixel format:
98 */
99 static short hpcr_rgbTbl[3][256] = {
100 {
101 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
102 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
103 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
104 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
105 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
106 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
107 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
108 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
109 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
110 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
111 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
112 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
113 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
114 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
115 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
116 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
117 },
118 {
119 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
120 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
121 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
122 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
123 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
124 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
125 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
126 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
127 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
129 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
130 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
131 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
132 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
133 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
134 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
135 },
136 {
137 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
138 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
139 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
140 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
141 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
142 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
143 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
144 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
145 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
146 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
147 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
148 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
149 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
150 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
151 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
152 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
153 }
154 };
155
156
157
158 /**********************************************************************/
159 /***** X Utility Functions *****/
160 /**********************************************************************/
161
162
163 /*
164 * X/Mesa error reporting function:
165 */
166 static void error( const char *msg )
167 {
168 if (getenv("MESA_DEBUG"))
169 fprintf( stderr, "X/Mesa error: %s\n", msg );
170 }
171
172
173 /*
174 * Return the host's byte order as LSBFirst or MSBFirst ala X.
175 */
176 #ifndef XFree86Server
177 static int host_byte_order( void )
178 {
179 int i = 1;
180 char *cptr = (char *) &i;
181 return (*cptr==1) ? LSBFirst : MSBFirst;
182 }
183 #endif
184
185
186 /*
187 * Error handling.
188 */
189 #ifndef XFree86Server
190 static int mesaXErrorFlag = 0;
191
192 static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
193 {
194 (void) dpy;
195 (void) event;
196 mesaXErrorFlag = 1;
197 return 0;
198 }
199 #endif
200
201
202 /*
203 * Check if the X Shared Memory extension is available.
204 * Return: 0 = not available
205 * 1 = shared XImage support available
206 * 2 = shared Pixmap support available also
207 */
208 #ifndef XFree86Server
209 static int check_for_xshm( XMesaDisplay *display )
210 {
211 #ifdef USE_XSHM
212 int major, minor, ignore;
213 Bool pixmaps;
214
215 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
216 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
217 return (pixmaps==True) ? 2 : 1;
218 }
219 else {
220 return 0;
221 }
222 }
223 else {
224 return 0;
225 }
226 #else
227 /* Can't compile XSHM support */
228 return 0;
229 #endif
230 }
231 #endif
232
233
234 /*
235 * Return the width and height of the given drawable.
236 */
237 static void get_drawable_size( XMesaDisplay *dpy, XMesaDrawable d,
238 unsigned int *width, unsigned int *height)
239 {
240 #ifdef XFree86Server
241 (void) dpy;
242 *width = d->width;
243 *height = d->height;
244 #else
245 Window root;
246 int x, y;
247 unsigned int bw, depth;
248
249 _glthread_LOCK_MUTEX(_xmesa_lock);
250 XGetGeometry( dpy, d, &root, &x, &y, width, height, &bw, &depth );
251 _glthread_UNLOCK_MUTEX(_xmesa_lock);
252 #endif
253 }
254
255
256 /*
257 * Apply gamma correction to an intensity value in [0..max]. Return the
258 * new intensity value.
259 */
260 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
261 {
262 if (gamma == 1.0) {
263 return value;
264 }
265 else {
266 double x = (double) value / (double) max;
267 return (GLint) ((GLfloat) max * pow( x, 1.0F/gamma ) + 0.5F);
268 }
269 }
270
271
272
273 /*
274 * Return the true number of bits per pixel for XImages.
275 * For example, if we request a 24-bit deep visual we may actually need/get
276 * 32bpp XImages. This function returns the appropriate bpp.
277 * Input: dpy - the X display
278 * visinfo - desribes the visual to be used for XImages
279 * Return: true number of bits per pixel for XImages
280 */
281 #define GET_BITS_PER_PIXEL(xmv) bits_per_pixel(xmv)
282
283 #ifdef XFree86Server
284
285 static int bits_per_pixel( XMesaVisual xmv )
286 {
287 XMesaVisualInfo visinfo = xmv->visinfo;
288 const int depth = visinfo->nplanes;
289 int i;
290 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
291 if (screenInfo.formats[i].depth == depth)
292 return screenInfo.formats[i].bitsPerPixel;
293 }
294 return depth; /* should never get here, but this should be safe */
295 }
296
297 #else
298
299 static int bits_per_pixel( XMesaVisual xmv )
300 {
301 XMesaDisplay *dpy = xmv->display;
302 XMesaVisualInfo visinfo = xmv->visinfo;
303 XMesaImage *img;
304 int bitsPerPixel;
305 /* Create a temporary XImage */
306 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
307 ZPixmap, 0, /*format, offset*/
308 (char*) MALLOC(8), /*data*/
309 1, 1, /*width, height*/
310 32, /*bitmap_pad*/
311 0 /*bytes_per_line*/
312 );
313 assert(img);
314 /* grab the bits/pixel value */
315 bitsPerPixel = img->bits_per_pixel;
316 /* free the XImage */
317 FREE( img->data );
318 img->data = NULL;
319 XMesaDestroyImage( img );
320 return bitsPerPixel;
321 }
322 #endif
323
324
325
326 /*
327 * Determine if a given X window ID is valid (window exists).
328 * Do this by calling XGetWindowAttributes() for the window and
329 * checking if we catch an X error.
330 * Input: dpy - the display
331 * win - the window to check for existance
332 * Return: GL_TRUE - window exists
333 * GL_FALSE - window doesn't exist
334 */
335 #ifndef XFree86Server
336 static GLboolean WindowExistsFlag;
337
338 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
339 {
340 (void) dpy;
341 if (xerr->error_code == BadWindow) {
342 WindowExistsFlag = GL_FALSE;
343 }
344 return 0;
345 }
346
347 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
348 {
349 XWindowAttributes wa;
350 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
351 WindowExistsFlag = GL_TRUE;
352 old_handler = XSetErrorHandler(window_exists_err_handler);
353 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
354 XSetErrorHandler(old_handler);
355 return WindowExistsFlag;
356 }
357 #endif
358
359
360
361 /**********************************************************************/
362 /***** Linked list of XMesaBuffers *****/
363 /**********************************************************************/
364
365 static XMesaBuffer XMesaBufferList = NULL;
366
367
368 /* Allocate a new XMesaBuffer, add to linked list */
369 static XMesaBuffer alloc_xmesa_buffer(void)
370 {
371 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
372 if (b) {
373 b->Next = XMesaBufferList;
374 XMesaBufferList = b;
375 }
376 return b;
377 }
378
379
380 /*
381 * Find an XMesaBuffer by matching X display and colormap but NOT matching
382 * the notThis buffer.
383 */
384 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
385 XMesaColormap cmap,
386 XMesaBuffer notThis)
387 {
388 XMesaBuffer b;
389 for (b=XMesaBufferList; b; b=b->Next) {
390 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
391 return b;
392 }
393 }
394 return NULL;
395 }
396
397
398 /*
399 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
400 * entries.
401 */
402 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
403 {
404 XMesaBuffer prev = NULL, b;
405 (void) client;
406 for (b=XMesaBufferList; b; b=b->Next) {
407 if (b==buffer) {
408 /* unlink bufer from list */
409 if (prev)
410 prev->Next = buffer->Next;
411 else
412 XMesaBufferList = buffer->Next;
413 /* Check to free X colors */
414 if (buffer->num_alloced>0) {
415 /* If no other buffer uses this X colormap then free the colors. */
416 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
417 #ifdef XFree86Server
418 (void)FreeColors(buffer->cmap, client,
419 buffer->num_alloced, buffer->alloced_colors,
420 0);
421 #else
422 XFreeColors(buffer->display, buffer->cmap,
423 buffer->alloced_colors, buffer->num_alloced, 0);
424 #endif
425 }
426 }
427 FREE(buffer);
428 return;
429 }
430 /* continue search */
431 prev = b;
432 }
433 /* buffer not found in XMesaBufferList */
434 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
435 }
436
437
438 /* Copy X color table stuff from one XMesaBuffer to another. */
439 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
440 {
441 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
442 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
443 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
444 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
445 dst->num_alloced = src->num_alloced;
446 MEMCPY(dst->alloced_colors, src->alloced_colors,
447 sizeof(src->alloced_colors));
448 }
449
450
451
452 /**********************************************************************/
453 /***** Misc Private Functions *****/
454 /**********************************************************************/
455
456
457 /*
458 * Return number of bits set in n.
459 */
460 static int bitcount( unsigned long n )
461 {
462 int bits;
463 for (bits=0; n>0; n=n>>1) {
464 if (n&1) {
465 bits++;
466 }
467 }
468 return bits;
469 }
470
471
472
473 /*
474 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
475 * Return: GL_TRUE if success, GL_FALSE if error
476 */
477 #ifndef XFree86Server
478 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
479 {
480 #ifdef USE_XSHM
481 /*
482 * We have to do a _lot_ of error checking here to be sure we can
483 * really use the XSHM extension. It seems different servers trigger
484 * errors at different points if the extension won't work. Therefore
485 * we have to be very careful...
486 */
487 GC gc;
488 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
489
490 b->backimage = XShmCreateImage( b->xm_visual->display,
491 b->xm_visual->visinfo->visual,
492 b->xm_visual->visinfo->depth,
493 ZPixmap, NULL, &b->shminfo,
494 b->width, b->height );
495 if (b->backimage == NULL) {
496 error("alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
497 b->shm = 0;
498 return GL_FALSE;
499 }
500
501 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
502 * b->backimage->height, IPC_CREAT|0777 );
503 if (b->shminfo.shmid < 0) {
504 if (getenv("MESA_DEBUG"))
505 perror("alloc_back_buffer");
506 XDestroyImage( b->backimage );
507 b->backimage = NULL;
508 error("alloc_back_buffer: Shared memory error (shmget), disabling.");
509 b->shm = 0;
510 return GL_FALSE;
511 }
512
513 b->shminfo.shmaddr = b->backimage->data
514 = (char*)shmat( b->shminfo.shmid, 0, 0 );
515 if (b->shminfo.shmaddr == (char *) -1) {
516 if (getenv("MESA_DEBUG"))
517 perror("alloc_back_buffer");
518 XDestroyImage( b->backimage );
519 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
520 b->backimage = NULL;
521 error("alloc_back_buffer: Shared memory error (shmat), disabling.");
522 b->shm = 0;
523 return GL_FALSE;
524 }
525
526 b->shminfo.readOnly = False;
527 mesaXErrorFlag = 0;
528 old_handler = XSetErrorHandler( mesaHandleXError );
529 /* This may trigger the X protocol error we're ready to catch: */
530 XShmAttach( b->xm_visual->display, &b->shminfo );
531 XSync( b->xm_visual->display, False );
532
533 if (mesaXErrorFlag) {
534 /* we are on a remote display, this error is normal, don't print it */
535 XFlush( b->xm_visual->display );
536 mesaXErrorFlag = 0;
537 XDestroyImage( b->backimage );
538 shmdt( b->shminfo.shmaddr );
539 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
540 b->backimage = NULL;
541 b->shm = 0;
542 (void) XSetErrorHandler( old_handler );
543 return GL_FALSE;
544 }
545
546 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
547
548 /* Finally, try an XShmPutImage to be really sure the extension works */
549 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
550 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
551 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
552 XSync( b->xm_visual->display, False );
553 XFreeGC( b->xm_visual->display, gc );
554 (void) XSetErrorHandler( old_handler );
555 if (mesaXErrorFlag) {
556 XFlush( b->xm_visual->display );
557 mesaXErrorFlag = 0;
558 XDestroyImage( b->backimage );
559 shmdt( b->shminfo.shmaddr );
560 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
561 b->backimage = NULL;
562 b->shm = 0;
563 return GL_FALSE;
564 }
565
566 if (b->backimage) {
567 int height = b->backimage->height;
568 /* Needed by PIXELADDR1 macro */
569 b->ximage_width1 = b->backimage->bytes_per_line;
570 b->ximage_origin1 = (GLubyte *) b->backimage->data
571 + b->ximage_width1 * (height-1);
572 /* Needed by PIXELADDR2 macro */
573 b->ximage_width2 = b->backimage->bytes_per_line / 2;
574 b->ximage_origin2 = (GLushort *) b->backimage->data
575 + b->ximage_width2 * (height-1);
576 /* Needed by PIXELADDR3 macro */
577 b->ximage_width3 = b->backimage->bytes_per_line;
578 b->ximage_origin3 = (GLubyte *) b->backimage->data
579 + b->ximage_width3 * (height-1);
580 /* Needed by PIXELADDR4 macro */
581 b->ximage_width4 = b->backimage->width;
582 b->ximage_origin4 = (GLuint *) b->backimage->data
583 + b->ximage_width4 * (height-1);
584 }
585
586 return GL_TRUE;
587 #else
588 /* Can't compile XSHM support */
589 return GL_FALSE;
590 #endif
591 }
592 #endif
593
594
595
596 /*
597 * Setup an off-screen pixmap or Ximage to use as the back buffer.
598 * Input: b - the X/Mesa buffer
599 */
600 void xmesa_alloc_back_buffer( XMesaBuffer b )
601 {
602 if (b->db_state==BACK_XIMAGE) {
603 /* Deallocate the old backimage, if any */
604 if (b->backimage) {
605 #if defined(USE_XSHM) && !defined(XFree86Server)
606 if (b->shm) {
607 XShmDetach( b->xm_visual->display, &b->shminfo );
608 XDestroyImage( b->backimage );
609 shmdt( b->shminfo.shmaddr );
610 }
611 else
612 #endif
613 XMesaDestroyImage( b->backimage );
614 b->backimage = NULL;
615 }
616
617 /* Allocate new back buffer */
618 #ifdef XFree86Server
619 {
620 /* Allocate a regular XImage for the back buffer. */
621 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
622 b->width, b->height, NULL);
623 #else
624 if (b->shm==0
625 || alloc_shm_back_buffer(b)==GL_FALSE
626 ) {
627 /* Allocate a regular XImage for the back buffer. */
628 b->backimage = XCreateImage( b->xm_visual->display,
629 b->xm_visual->visinfo->visual,
630 GET_VISUAL_DEPTH(b->xm_visual),
631 ZPixmap, 0, /* format, offset */
632 NULL, b->width, b->height,
633 8, 0 ); /* pad, bytes_per_line */
634 #endif
635 if (!b->backimage) {
636 error("alloc_back_buffer: XCreateImage failed.");
637 }
638 b->backimage->data = (char *) MALLOC( b->backimage->height
639 * b->backimage->bytes_per_line );
640 if (!b->backimage->data) {
641 error("alloc_back_buffer: MALLOC failed.");
642 XMesaDestroyImage( b->backimage );
643 b->backimage = NULL;
644 }
645 }
646 b->backpixmap = None;
647 }
648 else if (b->db_state==BACK_PIXMAP) {
649 XMesaPixmap old_pixmap = b->backpixmap;
650 /* Free the old back pixmap */
651 if (b->backpixmap) {
652 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
653 }
654 /* Allocate new back pixmap */
655 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
656 b->width, b->height,
657 GET_VISUAL_DEPTH(b->xm_visual) );
658 b->backimage = NULL;
659 /* update other references to backpixmap */
660 if (b->buffer==(XMesaDrawable)old_pixmap) {
661 b->buffer = (XMesaDrawable)b->backpixmap;
662 }
663 }
664 }
665
666
667
668 /*
669 * A replacement for XAllocColor. This function should never
670 * fail to allocate a color. When XAllocColor fails, we return
671 * the nearest matching color. If we have to allocate many colors
672 * this function isn't too efficient; the XQueryColors() could be
673 * done just once.
674 * Written by Michael Pichler, Brian Paul, Mark Kilgard
675 * Input: dpy - X display
676 * cmap - X colormap
677 * cmapSize - size of colormap
678 * In/Out: color - the XColor struct
679 * Output: exact - 1=exact color match, 0=closest match
680 * alloced - 1=XAlloc worked, 0=XAlloc failed
681 */
682 static void
683 noFaultXAllocColor( int client,
684 XMesaDisplay *dpy,
685 XMesaColormap cmap,
686 int cmapSize,
687 XMesaColor *color,
688 int *exact, int *alloced )
689 {
690 #ifdef XFree86Server
691 Pixel *ppixIn;
692 xrgb *ctable;
693 #else
694 /* we'll try to cache ctable for better remote display performance */
695 static Display *prevDisplay = NULL;
696 static XMesaColormap prevCmap = 0;
697 static int prevCmapSize = 0;
698 static XMesaColor *ctable = NULL;
699 #endif
700 XMesaColor subColor;
701 int i, bestmatch;
702 double mindist; /* 3*2^16^2 exceeds long int precision. */
703
704 (void) client;
705
706 /* First try just using XAllocColor. */
707 #ifdef XFree86Server
708 if (AllocColor(cmap,
709 &color->red, &color->green, &color->blue,
710 &color->pixel,
711 client) == Success) {
712 #else
713 if (XAllocColor(dpy, cmap, color)) {
714 #endif
715 *exact = 1;
716 *alloced = 1;
717 return;
718 }
719
720 /* Alloc failed, search for closest match */
721
722 /* Retrieve color table entries. */
723 /* XXX alloca candidate. */
724 #ifdef XFree86Server
725 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
726 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
727 for (i = 0; i < cmapSize; i++) {
728 ppixIn[i] = i;
729 }
730 QueryColors(cmap, cmapSize, ppixIn, ctable);
731 #else
732 if (prevDisplay != dpy || prevCmap != cmap
733 || prevCmapSize != cmapSize || !ctable) {
734 /* free previously cached color table */
735 if (ctable)
736 FREE(ctable);
737 /* Get the color table from X */
738 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
739 assert(ctable);
740 for (i = 0; i < cmapSize; i++) {
741 ctable[i].pixel = i;
742 }
743 XQueryColors(dpy, cmap, ctable, cmapSize);
744 prevDisplay = dpy;
745 prevCmap = cmap;
746 prevCmapSize = cmapSize;
747 }
748 #endif
749
750 /* Find best match. */
751 bestmatch = -1;
752 mindist = 0.0;
753 for (i = 0; i < cmapSize; i++) {
754 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
755 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
756 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
757 double dist = dr * dr + dg * dg + db * db;
758 if (bestmatch < 0 || dist < mindist) {
759 bestmatch = i;
760 mindist = dist;
761 }
762 }
763
764 /* Return result. */
765 subColor.red = ctable[bestmatch].red;
766 subColor.green = ctable[bestmatch].green;
767 subColor.blue = ctable[bestmatch].blue;
768 /* Try to allocate the closest match color. This should only
769 * fail if the cell is read/write. Otherwise, we're incrementing
770 * the cell's reference count.
771 */
772 #ifdef XFree86Server
773 if (AllocColor(cmap,
774 &subColor.red, &subColor.green, &subColor.blue,
775 &subColor.pixel,
776 client) == Success) {
777 #else
778 if (XAllocColor(dpy, cmap, &subColor)) {
779 #endif
780 *alloced = 1;
781 }
782 else {
783 /* do this to work around a problem reported by Frank Ortega */
784 subColor.pixel = (unsigned long) bestmatch;
785 subColor.red = ctable[bestmatch].red;
786 subColor.green = ctable[bestmatch].green;
787 subColor.blue = ctable[bestmatch].blue;
788 subColor.flags = DoRed | DoGreen | DoBlue;
789 *alloced = 0;
790 }
791 #ifdef XFree86Server
792 FREE(ppixIn);
793 FREE(ctable);
794 #else
795 /* don't free table, save it for next time */
796 #endif
797
798 *color = subColor;
799 *exact = 0;
800 }
801
802
803
804
805 /*
806 * Do setup for PF_GRAYSCALE pixel format.
807 * Note that buffer may be NULL.
808 */
809 static GLboolean setup_grayscale( int client, XMesaVisual v,
810 XMesaBuffer buffer, XMesaColormap cmap )
811 {
812 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
813 return GL_FALSE;
814 }
815
816 if (buffer) {
817 XMesaBuffer prevBuffer;
818
819 if (!cmap) {
820 return GL_FALSE;
821 }
822
823 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
824 if (prevBuffer &&
825 (buffer->xm_visual->gl_visual->rgbMode ==
826 prevBuffer->xm_visual->gl_visual->rgbMode)) {
827 /* Copy colormap stuff from previous XMesaBuffer which uses same
828 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
829 */
830 copy_colortable_info(buffer, prevBuffer);
831 }
832 else {
833 /* Allocate 256 shades of gray */
834 int gray;
835 int colorsfailed = 0;
836 for (gray=0;gray<256;gray++) {
837 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
838 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
839 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
840 int exact, alloced;
841 XMesaColor xcol;
842 xcol.red = (r << 8) | r;
843 xcol.green = (g << 8) | g;
844 xcol.blue = (b << 8) | b;
845 noFaultXAllocColor( client, v->display,
846 cmap, GET_COLORMAP_SIZE(v),
847 &xcol, &exact, &alloced );
848 if (!exact) {
849 colorsfailed++;
850 }
851 if (alloced) {
852 assert(buffer->num_alloced<256);
853 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
854 buffer->num_alloced++;
855 }
856
857 /*OLD
858 assert(gray < 576);
859 buffer->color_table[gray*3+0] = xcol.pixel;
860 buffer->color_table[gray*3+1] = xcol.pixel;
861 buffer->color_table[gray*3+2] = xcol.pixel;
862 assert(xcol.pixel < 65536);
863 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
864 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
865 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
866 */
867 buffer->color_table[gray] = xcol.pixel;
868 assert(xcol.pixel < 65536);
869 buffer->pixel_to_r[xcol.pixel] = gray;
870 buffer->pixel_to_g[xcol.pixel] = gray;
871 buffer->pixel_to_b[xcol.pixel] = gray;
872 }
873
874 if (colorsfailed && getenv("MESA_DEBUG")) {
875 fprintf( stderr,
876 "Note: %d out of 256 needed colors do not match exactly.\n",
877 colorsfailed );
878 }
879 }
880 }
881
882 v->dithered_pf = PF_GRAYSCALE;
883 v->undithered_pf = PF_GRAYSCALE;
884 return GL_TRUE;
885 }
886
887
888
889 /*
890 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
891 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
892 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
893 * color. While this function was originally designed just for 8-bit
894 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
895 * Dithering code contributed by Bob Mercier.
896 */
897 static GLboolean setup_dithered_color( int client, XMesaVisual v,
898 XMesaBuffer buffer, XMesaColormap cmap )
899 {
900 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
901 return GL_FALSE;
902 }
903
904 if (buffer) {
905 XMesaBuffer prevBuffer;
906
907 if (!cmap) {
908 return GL_FALSE;
909 }
910
911 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
912 if (prevBuffer &&
913 (buffer->xm_visual->gl_visual->rgbMode ==
914 prevBuffer->xm_visual->gl_visual->rgbMode)) {
915 /* Copy colormap stuff from previous, matching XMesaBuffer.
916 * Do this to avoid time spent in noFaultXAllocColor.
917 */
918 copy_colortable_info(buffer, prevBuffer);
919 }
920 else {
921 /* Allocate X colors and initialize color_table[], red_table[], etc */
922 int r, g, b, i;
923 int colorsfailed = 0;
924 for (r = 0; r < _R; r++) {
925 for (g = 0; g < _G; g++) {
926 for (b = 0; b < _B; b++) {
927 XMesaColor xcol;
928 int exact, alloced;
929 xcol.red =gamma_adjust(v->RedGamma, r*65535/(_R-1),65535);
930 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(_G-1),65535);
931 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(_B-1),65535);
932 noFaultXAllocColor( client, v->display,
933 cmap, GET_COLORMAP_SIZE(v),
934 &xcol, &exact, &alloced );
935 if (!exact) {
936 colorsfailed++;
937 }
938 if (alloced) {
939 assert(buffer->num_alloced<256);
940 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
941 buffer->num_alloced++;
942 }
943 i = _MIX( r, g, b );
944 assert(i < 576);
945 buffer->color_table[i] = xcol.pixel;
946 assert(xcol.pixel < 65536);
947 buffer->pixel_to_r[xcol.pixel] = r * 255 / (_R-1);
948 buffer->pixel_to_g[xcol.pixel] = g * 255 / (_G-1);
949 buffer->pixel_to_b[xcol.pixel] = b * 255 / (_B-1);
950 }
951 }
952 }
953
954 if (colorsfailed && getenv("MESA_DEBUG")) {
955 fprintf( stderr,
956 "Note: %d out of %d needed colors do not match exactly.\n",
957 colorsfailed, _R*_G*_B );
958 }
959 }
960 }
961
962 v->dithered_pf = PF_DITHER;
963 v->undithered_pf = PF_LOOKUP;
964 return GL_TRUE;
965 }
966
967
968 /*
969 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
970 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
971 * Special dithering tables have to be initialized.
972 */
973 static void setup_8bit_hpcr( XMesaVisual v )
974 {
975 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
976 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
977 * on the root window AND the colormap obtainable by XGetRGBColormaps
978 * for that atom must be set on the window. (see also tkInitWindow)
979 * If that colormap is not set, the output will look stripy.
980 */
981
982 /* Setup color tables with gamma correction */
983 int i;
984 double g;
985
986 g = 1.0 / v->RedGamma;
987 for (i=0; i<256; i++) {
988 GLint red = (GLint) (255.0 * pow( hpcr_rgbTbl[0][i]/255.0, g ) + 0.5);
989 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
990 }
991
992 g = 1.0 / v->GreenGamma;
993 for (i=0; i<256; i++) {
994 GLint green = (GLint) (255.0 * pow( hpcr_rgbTbl[1][i]/255.0, g ) + 0.5);
995 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
996 }
997
998 g = 1.0 / v->BlueGamma;
999 for (i=0; i<256; i++) {
1000 GLint blue = (GLint) (255.0 * pow( hpcr_rgbTbl[2][i]/255.0, g ) + 0.5);
1001 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
1002 }
1003 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
1004 v->dithered_pf = PF_HPCR;
1005
1006 /* which method should I use to clear */
1007 /* GL_FALSE: keep the ordinary method */
1008 /* GL_TRUE : clear with dither pattern */
1009 v->hpcr_clear_flag = getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
1010
1011 if (v->hpcr_clear_flag) {
1012 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
1013 DefaultRootWindow(v->display),
1014 16, 2, 8);
1015 #ifndef XFree86Server
1016 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
1017 0, 0, 16, 2, AllPlanes, ZPixmap);
1018 #endif
1019 }
1020 }
1021
1022
1023 /*
1024 * Setup RGB rendering for a window with a True/DirectColor visual.
1025 */
1026 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
1027 XMesaWindow window, XMesaColormap cmap )
1028 {
1029 unsigned long rmask, gmask, bmask;
1030 (void) buffer;
1031 (void) window;
1032 (void) cmap;
1033
1034 /* Compute red multiplier (mask) and bit shift */
1035 v->rshift = 0;
1036 rmask = GET_REDMASK(v);
1037 while ((rmask & 1)==0) {
1038 v->rshift++;
1039 rmask = rmask >> 1;
1040 }
1041
1042 /* Compute green multiplier (mask) and bit shift */
1043 v->gshift = 0;
1044 gmask = GET_GREENMASK(v);
1045 while ((gmask & 1)==0) {
1046 v->gshift++;
1047 gmask = gmask >> 1;
1048 }
1049
1050 /* Compute blue multiplier (mask) and bit shift */
1051 v->bshift = 0;
1052 bmask = GET_BLUEMASK(v);
1053 while ((bmask & 1)==0) {
1054 v->bshift++;
1055 bmask = bmask >> 1;
1056 }
1057
1058 /*
1059 * Compute component-to-pixel lookup tables and dithering kernel
1060 */
1061 {
1062 static GLubyte kernel[16] = {
1063 0*16, 8*16, 2*16, 10*16,
1064 12*16, 4*16, 14*16, 6*16,
1065 3*16, 11*16, 1*16, 9*16,
1066 15*16, 7*16, 13*16, 5*16,
1067 };
1068 GLint rBits = bitcount(rmask);
1069 GLint gBits = bitcount(gmask);
1070 GLint bBits = bitcount(bmask);
1071 GLint maxBits;
1072 GLuint i;
1073
1074 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1075 for (i=0; i<=rmask; i++)
1076 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1077 for (i=0; i<=gmask; i++)
1078 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1079 for (i=0; i<=bmask; i++)
1080 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1081
1082 /* convert RGB values from [0,255] to pixel components */
1083
1084 for (i=0;i<256;i++) {
1085 GLint r = gamma_adjust(v->RedGamma, i, 255);
1086 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1087 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1088 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1089 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1090 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1091 }
1092 /* overflow protection */
1093 for (i=256;i<512;i++) {
1094 v->RtoPixel[i] = v->RtoPixel[255];
1095 v->GtoPixel[i] = v->GtoPixel[255];
1096 v->BtoPixel[i] = v->BtoPixel[255];
1097 }
1098
1099 /* setup dithering kernel */
1100 maxBits = rBits;
1101 if (gBits > maxBits) maxBits = gBits;
1102 if (bBits > maxBits) maxBits = bBits;
1103 for (i=0;i<16;i++) {
1104 v->Kernel[i] = kernel[i] >> maxBits;
1105 }
1106
1107 v->undithered_pf = PF_TRUECOLOR;
1108 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_TRUEDITHER : PF_TRUECOLOR;
1109 }
1110
1111 /*
1112 * Now check for TrueColor visuals which we can optimize.
1113 */
1114 if ( GET_REDMASK(v) ==0x0000ff
1115 && GET_GREENMASK(v)==0x00ff00
1116 && GET_BLUEMASK(v) ==0xff0000
1117 && CHECK_BYTE_ORDER(v)
1118 && v->BitsPerPixel==32
1119 && sizeof(GLuint)==4
1120 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1121 /* common 32 bpp config used on SGI, Sun */
1122 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1123 }
1124 else if (GET_REDMASK(v) ==0xff0000
1125 && GET_GREENMASK(v)==0x00ff00
1126 && GET_BLUEMASK(v) ==0x0000ff
1127 && CHECK_BYTE_ORDER(v)
1128 && v->BitsPerPixel==32
1129 && sizeof(GLuint)==4
1130 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1131 /* common 32 bpp config used on Linux, HP, IBM */
1132 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1133 }
1134 else if (GET_REDMASK(v) ==0xff0000
1135 && GET_GREENMASK(v)==0x00ff00
1136 && GET_BLUEMASK(v) ==0x0000ff
1137 && CHECK_BYTE_ORDER(v)
1138 && v->BitsPerPixel==24
1139 && sizeof(GLuint)==4
1140 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1141 /* common packed 24 bpp config used on Linux */
1142 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1143 }
1144 else if (GET_REDMASK(v) ==0xf800
1145 && GET_GREENMASK(v)==0x07e0
1146 && GET_BLUEMASK(v) ==0x001f
1147 && CHECK_BYTE_ORDER(v)
1148 && v->BitsPerPixel==16
1149 && sizeof(GLushort)==2
1150 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1151 /* 5-6-5 color weight on common PC VGA boards */
1152 v->undithered_pf = PF_5R6G5B;
1153 v->dithered_pf = PF_DITHER_5R6G5B;
1154 }
1155 else if (GET_REDMASK(v) ==0xe0
1156 && GET_GREENMASK(v)==0x1c
1157 && GET_BLUEMASK(v) ==0x03
1158 && CHECK_FOR_HPCR(v)) {
1159 setup_8bit_hpcr( v );
1160 }
1161 }
1162
1163
1164
1165 /*
1166 * Setup RGB rendering for a window with a monochrome visual.
1167 */
1168 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1169 {
1170 (void) b;
1171 v->dithered_pf = v->undithered_pf = PF_1BIT;
1172 /* if black=1 then we must flip pixel values */
1173 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1174 }
1175
1176
1177
1178 /*
1179 * When a context is "made current" for the first time, we can finally
1180 * finish initializing the context's visual and buffer information.
1181 * Input: v - the XMesaVisual to initialize
1182 * b - the XMesaBuffer to initialize (may be NULL)
1183 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1184 * window - the window/pixmap we're rendering into
1185 * cmap - the colormap associated with the window/pixmap
1186 * Return: GL_TRUE=success, GL_FALSE=failure
1187 */
1188 static GLboolean initialize_visual_and_buffer( int client,
1189 XMesaVisual v,
1190 XMesaBuffer b,
1191 GLboolean rgb_flag,
1192 XMesaDrawable window,
1193 XMesaColormap cmap
1194 )
1195 {
1196 #ifndef XFree86Server
1197 XGCValues gcvalues;
1198 #endif
1199
1200 if (b) {
1201 assert(b->xm_visual == v);
1202 }
1203
1204 /* Save true bits/pixel */
1205 v->BitsPerPixel = GET_BITS_PER_PIXEL(v);
1206 assert(v->BitsPerPixel > 0);
1207
1208
1209 if (rgb_flag==GL_FALSE) {
1210 /* COLOR-INDEXED WINDOW:
1211 * Even if the visual is TrueColor or DirectColor we treat it as
1212 * being color indexed. This is weird but might be useful to someone.
1213 */
1214 v->dithered_pf = v->undithered_pf = PF_INDEX;
1215 v->index_bits = GET_VISUAL_DEPTH(v);
1216 }
1217 else {
1218 /* RGB WINDOW:
1219 * We support RGB rendering into almost any kind of visual.
1220 */
1221 int xclass;
1222 xclass = GET_VISUAL_CLASS(v);
1223 if (xclass==TrueColor || xclass==DirectColor) {
1224 setup_truecolor( v, b, (XMesaWindow)window, cmap );
1225 }
1226 else if (xclass==StaticGray && GET_VISUAL_DEPTH(v)==1) {
1227 setup_monochrome( v, b );
1228 }
1229 else if (xclass==GrayScale || xclass==StaticGray) {
1230 if (!setup_grayscale( client, v, b, cmap )) {
1231 return GL_FALSE;
1232 }
1233 }
1234 else if ((xclass==PseudoColor || xclass==StaticColor)
1235 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1236 if (!setup_dithered_color( client, v, b, cmap )) {
1237 return GL_FALSE;
1238 }
1239 }
1240 else {
1241 error("XMesa: RGB mode rendering not supported in given visual.");
1242 return GL_FALSE;
1243 }
1244 v->index_bits = 0;
1245
1246 if (getenv("MESA_NO_DITHER")) {
1247 v->dithered_pf = v->undithered_pf;
1248 }
1249 }
1250
1251
1252 /*
1253 * If MESA_INFO env var is set print out some debugging info
1254 * which can help Brian figure out what's going on when a user
1255 * reports bugs.
1256 */
1257 if (getenv("MESA_INFO")) {
1258 fprintf(stderr, "X/Mesa visual = %p\n", v);
1259 fprintf(stderr, "X/Mesa dithered pf = %u\n", v->dithered_pf);
1260 fprintf(stderr, "X/Mesa undithered pf = %u\n", v->undithered_pf);
1261 fprintf(stderr, "X/Mesa level = %d\n", v->level);
1262 fprintf(stderr, "X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1263 fprintf(stderr, "X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1264 }
1265
1266 if (b && window) {
1267 /* Do window-specific initializations */
1268
1269 /* Window dimensions */
1270 unsigned int w, h;
1271 get_drawable_size( v->display, window, &w, &h );
1272 b->width = w;
1273 b->height = h;
1274
1275 b->frontbuffer = window;
1276
1277 assert( v->gl_visual );
1278
1279 /* Setup for single/double buffering */
1280 if (v->gl_visual->doubleBufferMode) {
1281 /* Double buffered */
1282 #ifndef XFree86Server
1283 b->shm = check_for_xshm( v->display );
1284 #endif
1285 xmesa_alloc_back_buffer( b );
1286 if (b->db_state==BACK_PIXMAP) {
1287 b->buffer = (XMesaDrawable)b->backpixmap;
1288 }
1289 else {
1290 b->buffer = XIMAGE;
1291 }
1292 }
1293 else {
1294 /* Single Buffered */
1295 b->buffer = b->frontbuffer;
1296 }
1297
1298 /* X11 graphics contexts */
1299 #ifdef XFree86Server
1300 b->gc = CreateScratchGC(v->display, window->depth);
1301 #else
1302 b->gc = XCreateGC( v->display, window, 0, NULL );
1303 #endif
1304 XMesaSetFunction( v->display, b->gc, GXcopy );
1305
1306 /*
1307 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1308 * Patch contributed by Michael Pichler May 15, 1995.
1309 */
1310 #ifdef XFree86Server
1311 b->cleargc = CreateScratchGC(v->display, window->depth);
1312 {
1313 CARD32 v[1];
1314 v[0] = FALSE;
1315 dixChangeGC(NullClient, b->cleargc, GCGraphicsExposures, v, NULL);
1316 }
1317 #else
1318 gcvalues.graphics_exposures = False;
1319 b->cleargc = XCreateGC( v->display, window,
1320 GCGraphicsExposures, &gcvalues);
1321 #endif
1322 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1323 /*
1324 * Set fill style and tile pixmap once for all for HPCR stuff
1325 * (instead of doing it each time in clear_color_HPCR_pixmap())
1326 * Initialize whole stuff
1327 * Patch contributed by Jacques Leroy March 8, 1998.
1328 */
1329 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1330 int i;
1331 for (i=0; i<16; i++)
1332 {
1333 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1334 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1335 }
1336 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1337 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1338 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1339 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1340 }
1341
1342 /* Initialize the row buffer XImage for use in write_color_span() */
1343 #ifdef XFree86Server
1344 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1345 (char *)MALLOC(MAX_WIDTH*4));
1346 #else
1347 b->rowimage = XCreateImage( v->display,
1348 v->visinfo->visual,
1349 v->visinfo->depth,
1350 ZPixmap, 0, /*format, offset*/
1351 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1352 MAX_WIDTH, 1, /*width, height*/
1353 32, /*bitmap_pad*/
1354 0 /*bytes_per_line*/ );
1355 #endif
1356 }
1357
1358 return GL_TRUE;
1359 }
1360
1361
1362
1363 /*
1364 * Convert an RGBA color to a pixel value.
1365 */
1366 unsigned long
1367 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1368 GLuint pixelFormat)
1369 {
1370 switch (pixelFormat) {
1371 case PF_INDEX:
1372 return 0;
1373 case PF_TRUECOLOR:
1374 {
1375 unsigned long p;
1376 PACK_TRUECOLOR( p, r, g, b );
1377 return p;
1378 }
1379 case PF_8A8B8G8R:
1380 return PACK_8A8B8G8R( r, g, b, a );
1381 case PF_8R8G8B:
1382 /* fall through */
1383 case PF_8R8G8B24:
1384 return PACK_8R8G8B( r, g, b );
1385 case PF_5R6G5B:
1386 return PACK_5R6G5B( r, g, b );
1387 case PF_DITHER:
1388 {
1389 DITHER_SETUP;
1390 return DITHER( 1, 0, r, g, b );
1391 }
1392 case PF_1BIT:
1393 /* 382 = (3*255)/2 */
1394 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1395 case PF_HPCR:
1396 return DITHER_HPCR(1, 1, r, g, b);
1397 case PF_LOOKUP:
1398 {
1399 LOOKUP_SETUP;
1400 return LOOKUP( r, g, b );
1401 }
1402 case PF_GRAYSCALE:
1403 return GRAY_RGB( r, g, b );
1404 case PF_TRUEDITHER:
1405 /* fall through */
1406 case PF_DITHER_5R6G5B:
1407 {
1408 unsigned long p;
1409 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1410 return p;
1411 }
1412 default:
1413 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1414 }
1415 return 0;
1416 }
1417
1418
1419 /**********************************************************************/
1420 /***** Public Functions *****/
1421 /**********************************************************************/
1422
1423
1424 /*
1425 * Create a new X/Mesa visual.
1426 * Input: display - X11 display
1427 * visinfo - an XVisualInfo pointer
1428 * rgb_flag - GL_TRUE = RGB mode,
1429 * GL_FALSE = color index mode
1430 * alpha_flag - alpha buffer requested?
1431 * db_flag - GL_TRUE = double-buffered,
1432 * GL_FALSE = single buffered
1433 * stereo_flag - stereo visual?
1434 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1435 * GL_FALSE = use an off-screen pixmap for back buffer
1436 * depth_size - requested bits/depth values, or zero
1437 * stencil_size - requested bits/stencil values, or zero
1438 * accum_red_size - requested bits/red accum values, or zero
1439 * accum_green_size - requested bits/green accum values, or zero
1440 * accum_blue_size - requested bits/blue accum values, or zero
1441 * accum_alpha_size - requested bits/alpha accum values, or zero
1442 * num_samples - number of samples/pixel if multisampling, or zero
1443 * level - visual level, usually 0
1444 * visualCaveat - ala the GLX extension, usually GLX_NONE_EXT
1445 * Return; a new XMesaVisual or 0 if error.
1446 */
1447 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1448 XMesaVisualInfo visinfo,
1449 GLboolean rgb_flag,
1450 GLboolean alpha_flag,
1451 GLboolean db_flag,
1452 GLboolean stereo_flag,
1453 GLboolean ximage_flag,
1454 GLint depth_size,
1455 GLint stencil_size,
1456 GLint accum_red_size,
1457 GLint accum_green_size,
1458 GLint accum_blue_size,
1459 GLint accum_alpha_size,
1460 GLint num_samples,
1461 GLint level,
1462 GLint visualCaveat )
1463 {
1464 char *gamma;
1465 XMesaVisual v;
1466 GLint red_bits, green_bits, blue_bits, alpha_bits;
1467
1468 /* For debugging only */
1469 if (getenv("MESA_XSYNC")) {
1470 /* This makes debugging X easier.
1471 * In your debugger, set a breakpoint on _XError to stop when an
1472 * X protocol error is generated.
1473 */
1474 #ifdef XFree86Server
1475 /* NOT_NEEDED */
1476 #else
1477 XSynchronize( display, 1 );
1478 #endif
1479 }
1480
1481 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1482 if (!v) {
1483 return NULL;
1484 }
1485
1486 /*
1487 * In the X server, NULL is passed in for the display. It will have
1488 * to be set before using this visual. See XMesaSetVisualDisplay()
1489 * below.
1490 */
1491 v->display = display;
1492
1493 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1494 * the struct but we may need some of the information contained in it
1495 * at a later time.
1496 */
1497 #ifdef XFree86Server
1498 v->visinfo = visinfo;
1499 #else
1500 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1501 if(!v->visinfo) {
1502 FREE(v);
1503 return NULL;
1504 }
1505 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1506
1507 /* Save a copy of the pointer now so we can find this visual again
1508 * if we need to search for it in find_glx_visual().
1509 */
1510 v->vishandle = visinfo;
1511 #endif
1512
1513 #ifdef XFree86Server
1514 /* Initialize the depth of the screen */
1515 {
1516 PixmapFormatRec *format;
1517
1518 for (format = screenInfo.formats;
1519 format->depth != display->rootDepth;
1520 format++)
1521 ;
1522 v->screen_depth = format->bitsPerPixel;
1523 }
1524 #endif
1525
1526 /* check for MESA_GAMMA environment variable */
1527 gamma = getenv("MESA_GAMMA");
1528 if (gamma) {
1529 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1530 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1531 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1532 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1533 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1534 }
1535 else {
1536 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1537 }
1538
1539 v->ximage_flag = ximage_flag;
1540 v->level = level;
1541 v->VisualCaveat = visualCaveat;
1542
1543 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1544
1545 {
1546 int xclass;
1547 xclass = GET_VISUAL_CLASS(v);
1548 if (xclass==TrueColor || xclass==DirectColor) {
1549 red_bits = bitcount(GET_REDMASK(v));
1550 green_bits = bitcount(GET_GREENMASK(v));
1551 blue_bits = bitcount(GET_BLUEMASK(v));
1552 alpha_bits = 0;
1553 }
1554 else {
1555 /* this is an approximation */
1556 int depth;
1557 depth = GET_VISUAL_DEPTH(v);
1558 red_bits = depth / 3;
1559 depth -= red_bits;
1560 green_bits = depth / 2;
1561 depth -= green_bits;
1562 blue_bits = depth;
1563 alpha_bits = 0;
1564 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1565 }
1566 }
1567
1568 if (alpha_flag && alpha_bits == 0)
1569 alpha_bits = 8;
1570
1571 v->gl_visual = _mesa_create_visual( rgb_flag, db_flag, stereo_flag,
1572 red_bits, green_bits,
1573 blue_bits, alpha_bits,
1574 v->index_bits,
1575 depth_size,
1576 stencil_size,
1577 accum_red_size, accum_green_size,
1578 accum_blue_size, accum_alpha_size,
1579 0 );
1580 if (!v->gl_visual) {
1581 #ifndef XFree86Server
1582 FREE(v->visinfo);
1583 #endif
1584 FREE(v);
1585 return NULL;
1586 }
1587
1588 return v;
1589 }
1590
1591
1592 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1593 {
1594 v->display = dpy;
1595 }
1596
1597
1598 void XMesaDestroyVisual( XMesaVisual v )
1599 {
1600 _mesa_destroy_visual( v->gl_visual );
1601 #ifndef XFree86Server
1602 FREE(v->visinfo);
1603 #endif
1604 FREE(v);
1605 }
1606
1607
1608
1609 /*
1610 * Create a new XMesaContext.
1611 * Input: v - XMesaVisual
1612 * share_list - another XMesaContext with which to share display
1613 * lists or NULL if no sharing is wanted.
1614 * Return: an XMesaContext or NULL if error.
1615 */
1616 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1617 {
1618 XMesaContext c;
1619 GLcontext *ctx;
1620 GLboolean direct = GL_TRUE; /* XXXX */
1621 /* NOT_DONE: should this be GL_FALSE??? */
1622 static GLboolean firstTime = GL_TRUE;
1623
1624 if (firstTime) {
1625 _glthread_INIT_MUTEX(_xmesa_lock);
1626 firstTime = GL_FALSE;
1627 }
1628
1629 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1630 if (!c) {
1631 return NULL;
1632 }
1633
1634 ctx = c->gl_ctx = _mesa_create_context( v->gl_visual,
1635 share_list ? share_list->gl_ctx : (GLcontext *) NULL,
1636 (void *) c, direct );
1637 if (!c->gl_ctx) {
1638 FREE(c);
1639 return NULL;
1640 }
1641
1642 _mesa_enable_sw_extensions(ctx);
1643
1644 if (CHECK_BYTE_ORDER(v)) {
1645 c->swapbytes = GL_FALSE;
1646 }
1647 else {
1648 c->swapbytes = GL_TRUE;
1649 }
1650
1651 c->xm_visual = v;
1652 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1653 c->display = v->display;
1654 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1655
1656 ctx->Driver.UpdateState = xmesa_update_state;
1657
1658 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
1659 c->driContextPriv = driContextPriv;
1660 #endif
1661
1662 /* Initialize the software rasterizer and helper modules.
1663 */
1664 _swrast_CreateContext( ctx );
1665 _ac_CreateContext( ctx );
1666 _tnl_CreateContext( ctx );
1667 _swsetup_CreateContext( ctx );
1668
1669 xmesa_register_swrast_functions( ctx );
1670
1671 /* Set up some constant pointers:
1672 */
1673 xmesa_init_pointers( ctx );
1674
1675
1676 /* Run the config file
1677 */
1678 _mesa_context_initialize( ctx );
1679
1680
1681 return c;
1682 }
1683
1684
1685
1686
1687 void XMesaDestroyContext( XMesaContext c )
1688 {
1689 #ifdef FX
1690 if (c->xm_buffer && c->xm_buffer->FXctx)
1691 fxMesaDestroyContext(c->xm_buffer->FXctx);
1692 #endif
1693 if (c->gl_ctx) {
1694 _swsetup_DestroyContext( c->gl_ctx );
1695 _swrast_DestroyContext( c->gl_ctx );
1696 _tnl_DestroyContext( c->gl_ctx );
1697 _ac_DestroyContext( c->gl_ctx );
1698 _mesa_destroy_context( c->gl_ctx );
1699 }
1700
1701 /* Disassociate old buffer with this context */
1702 if (c->xm_buffer)
1703 c->xm_buffer->xm_context = NULL;
1704
1705 /* Destroy any buffers which are using this context. If we don't
1706 * we may have dangling references. Hmm, maybe we should just
1707 * set the buffer's context pointer to NULL instead of deleting it?
1708 * Let's see if we get any bug reports...
1709 * This contributed by Doug Rabson <dfr@calcaphon.com>
1710 */
1711 {
1712 XMesaBuffer b, next;
1713 for (b = XMesaBufferList; b; b = next) {
1714 next = b->Next;
1715 if (!b->pixmap_flag) {
1716 #ifndef XFree86Server
1717 XSync(b->display, False);
1718 #endif
1719 if (b->xm_context == c) {
1720 /* found a context created for this context */
1721 XMesaDestroyBuffer( b );
1722 }
1723 }
1724 }
1725 }
1726
1727 FREE( c );
1728 }
1729
1730
1731
1732 /*
1733 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1734 * Create a new XMesaBuffer from an X window.
1735 * Input: v - the XMesaVisual
1736 * w - the window
1737 * c - the context
1738 * Return: new XMesaBuffer or NULL if error
1739 */
1740 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1741 XMesaContext c )
1742 {
1743 #ifndef XFree86Server
1744 XWindowAttributes attr;
1745 #endif
1746 #ifdef FX
1747 char *fxEnvVar;
1748 #endif
1749 int client = 0;
1750
1751 XMesaBuffer b = alloc_xmesa_buffer();
1752 if (!b) {
1753 return NULL;
1754 }
1755
1756 (void) c;
1757
1758 #ifdef XFree86Server
1759 client = CLIENT_ID(((XMesaDrawable)w)->id);
1760 #endif
1761
1762 assert(v);
1763
1764 #ifdef XFree86Server
1765 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1766 #else
1767 XGetWindowAttributes( v->display, w, &attr );
1768
1769 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1770 #endif
1771 if (getenv("MESA_DEBUG")) {
1772 fprintf(stderr, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1773 }
1774 return NULL;
1775 }
1776
1777 b->xm_context = NULL; /* Associate no context with this buffer */
1778
1779 b->xm_visual = v;
1780 b->pixmap_flag = GL_FALSE;
1781 b->display = v->display;
1782 #ifdef XFree86Server
1783 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1784 #else
1785 if (attr.colormap) {
1786 b->cmap = attr.colormap;
1787 }
1788 else {
1789 if (getenv("MESA_DEBUG")) {
1790 fprintf(stderr, "Window %u has no colormap!\n", (unsigned int) w);
1791 }
1792 /* this is weird, a window w/out a colormap!? */
1793 /* OK, let's just allocate a new one and hope for the best */
1794 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1795 }
1796 #endif
1797
1798 /* determine back buffer implementation */
1799 if (v->gl_visual->doubleBufferMode) {
1800 if (v->ximage_flag) {
1801 b->db_state = BACK_XIMAGE;
1802 }
1803 else {
1804 b->db_state = BACK_PIXMAP;
1805 }
1806 }
1807 else {
1808 b->db_state = 0;
1809 }
1810
1811 b->gl_buffer = _mesa_create_framebuffer( v->gl_visual,
1812 v->gl_visual->depthBits > 0,
1813 v->gl_visual->stencilBits > 0,
1814 v->gl_visual->accumRedBits > 0,
1815 v->gl_visual->alphaBits > 0 );
1816 if (!b->gl_buffer) {
1817 free_xmesa_buffer(client, b);
1818 return NULL;
1819 }
1820
1821 if (!initialize_visual_and_buffer( client, v, b, v->gl_visual->rgbMode,
1822 (XMesaDrawable)w, b->cmap )) {
1823 _mesa_destroy_framebuffer( b->gl_buffer );
1824 free_xmesa_buffer(client, b);
1825 return NULL;
1826 }
1827
1828 #ifdef FX
1829 fxEnvVar = getenv("MESA_GLX_FX");
1830 if (fxEnvVar) {
1831 if (fxEnvVar[0]!='d') {
1832 int attribs[100];
1833 int numAttribs = 0;
1834 int hw;
1835 if (v->gl_visual->depthBits > 0) {
1836 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1837 attribs[numAttribs++] = 1;
1838 }
1839 if (v->gl_visual->doubleBufferMode) {
1840 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1841 }
1842 if (v->gl_visual->accumRedBits > 0) {
1843 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1844 attribs[numAttribs++] = v->gl_visual->accumRedBits;
1845 }
1846 if (v->gl_visual->stencilBits > 0) {
1847 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1848 attribs[numAttribs++] = v->gl_visual->stencilBits;
1849 }
1850 if (v->gl_visual->alphaBits > 0) {
1851 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1852 attribs[numAttribs++] = 1;
1853 }
1854 if (c->gl_ctx) {
1855 #define FXMESA_SHARE_CONTEXT 990099 /* keep in sync with fxapi.c! */
1856 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1857 attribs[numAttribs++] = (int) c->gl_ctx;
1858 }
1859 attribs[numAttribs++] = FXMESA_NONE;
1860
1861 if ((hw = fxQueryHardware())==GR_SSTTYPE_VOODOO) {
1862 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1863 if ((v->undithered_pf!=PF_INDEX) && (b->backimage)) {
1864 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1865 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1866 b->FXwindowHack = b->FXctx ? GL_TRUE : GL_FALSE;
1867 else
1868 b->FXwindowHack = GL_FALSE;
1869 }
1870 }
1871 else {
1872 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1873 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1874 GR_REFRESH_75Hz, attribs);
1875 else
1876 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1877 b->FXisHackUsable = GL_FALSE;
1878 b->FXwindowHack = GL_FALSE;
1879 }
1880 /*
1881 fprintf(stderr,
1882 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1883 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1884 */
1885 }
1886 }
1887 else {
1888 fprintf(stderr,"WARNING: This Mesa Library includes the Glide driver but\n");
1889 fprintf(stderr," you have not defined the MESA_GLX_FX env. var.\n");
1890 fprintf(stderr," (check the README.3DFX file for more information).\n\n");
1891 fprintf(stderr," you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1892 }
1893 #endif
1894
1895 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
1896 b->driDrawPriv = driDrawPriv;
1897 #endif
1898
1899 return b;
1900 }
1901
1902
1903 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1904 {
1905 return XMesaCreateWindowBuffer2( v, w, NULL );
1906 }
1907
1908
1909 /*
1910 * Create a new XMesaBuffer from an X pixmap.
1911 * Input: v - the XMesaVisual
1912 * p - the pixmap
1913 * cmap - the colormap, may be 0 if using a TrueColor or DirectColor
1914 * visual for the pixmap
1915 * Return: new XMesaBuffer or NULL if error
1916 */
1917 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1918 XMesaPixmap p, XMesaColormap cmap )
1919 {
1920 int client = 0;
1921 XMesaBuffer b = alloc_xmesa_buffer();
1922 if (!b) {
1923 return NULL;
1924 }
1925
1926
1927 #ifdef XFree86Server
1928 client = CLIENT_ID(((XMesaDrawable)p)->id);
1929 #endif
1930
1931 assert(v);
1932
1933 b->xm_context = NULL; /* Associate no context with this buffer */
1934
1935 b->xm_visual = v;
1936 b->pixmap_flag = GL_TRUE;
1937 b->display = v->display;
1938 b->cmap = cmap;
1939
1940 /* determine back buffer implementation */
1941 if (v->gl_visual->doubleBufferMode) {
1942 if (v->ximage_flag) {
1943 b->db_state = BACK_XIMAGE;
1944 }
1945 else {
1946 b->db_state = BACK_PIXMAP;
1947 }
1948 }
1949 else {
1950 b->db_state = 0;
1951 }
1952
1953 b->gl_buffer = _mesa_create_framebuffer( v->gl_visual,
1954 v->gl_visual->depthBits > 0,
1955 v->gl_visual->stencilBits > 0,
1956 v->gl_visual->accumRedBits +
1957 v->gl_visual->accumGreenBits +
1958 v->gl_visual->accumBlueBits > 0,
1959 v->gl_visual->alphaBits > 0 );
1960 if (!b->gl_buffer) {
1961 free_xmesa_buffer(client, b);
1962 return NULL;
1963 }
1964
1965 if (!initialize_visual_and_buffer(client, v, b, v->gl_visual->rgbMode,
1966 (XMesaDrawable)p, cmap)) {
1967 _mesa_destroy_framebuffer( b->gl_buffer );
1968 free_xmesa_buffer(client, b);
1969 return NULL;
1970 }
1971
1972 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
1973 b->driDrawPriv = driDrawPriv;
1974 #endif
1975
1976 return b;
1977 }
1978
1979
1980
1981 /*
1982 * Deallocate an XMesaBuffer structure and all related info.
1983 */
1984 void XMesaDestroyBuffer( XMesaBuffer b )
1985 {
1986 int client = 0;
1987
1988 #ifdef XFree86Server
1989 if (b->frontbuffer)
1990 client = CLIENT_ID(b->frontbuffer->id);
1991 #endif
1992
1993 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1994 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1995
1996 if (b->backimage) {
1997 #if defined(USE_XSHM) && !defined(XFree86Server)
1998 if (b->shm) {
1999 XShmDetach( b->xm_visual->display, &b->shminfo );
2000 XDestroyImage( b->backimage );
2001 shmdt( b->shminfo.shmaddr );
2002 }
2003 else
2004 #endif
2005 XMesaDestroyImage( b->backimage );
2006 }
2007 if (b->backpixmap) {
2008 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
2009 if (b->xm_visual->hpcr_clear_flag) {
2010 XMesaFreePixmap( b->xm_visual->display,
2011 b->xm_visual->hpcr_clear_pixmap );
2012 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
2013 }
2014 }
2015 if (b->rowimage) {
2016 FREE( b->rowimage->data );
2017 b->rowimage->data = NULL;
2018 XMesaDestroyImage( b->rowimage );
2019 }
2020
2021 if (b->xm_context)
2022 b->xm_context->xm_buffer = NULL;
2023
2024 _mesa_destroy_framebuffer( b->gl_buffer );
2025 free_xmesa_buffer(client, b);
2026 }
2027
2028
2029
2030 /*
2031 * Bind buffer b to context c and make c the current rendering context.
2032 */
2033 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2034 {
2035 return XMesaMakeCurrent2( c, b, b );
2036 }
2037
2038
2039 /*
2040 * Bind buffer b to context c and make c the current rendering context.
2041 */
2042 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2043 XMesaBuffer readBuffer )
2044 {
2045 if (c) {
2046 if (!drawBuffer || !readBuffer)
2047 return GL_FALSE; /* must specify buffers! */
2048
2049 #ifdef FX
2050 if (drawBuffer->FXctx) {
2051 fxMesaMakeCurrent(drawBuffer->FXctx);
2052
2053 /* Disassociate old buffer from this context */
2054 if (c->xm_buffer)
2055 c->xm_buffer->xm_context = NULL;
2056
2057 /* Associate the context with this buffer */
2058 drawBuffer->xm_context = c;
2059
2060 c->xm_buffer = drawBuffer;
2061 c->xm_read_buffer = readBuffer;
2062 c->use_read_buffer = (drawBuffer != readBuffer);
2063
2064 return GL_TRUE;
2065 }
2066 #endif
2067 if (c->gl_ctx == _mesa_get_current_context()
2068 && c->xm_buffer == drawBuffer
2069 && c->xm_read_buffer == readBuffer
2070 && c->xm_buffer->wasCurrent) {
2071 /* same context and buffer, do nothing */
2072 return GL_TRUE;
2073 }
2074
2075 /* Disassociate old buffer with this context */
2076 if (c->xm_buffer)
2077 c->xm_buffer->xm_context = NULL;
2078 drawBuffer->xm_context = c; /* Associate the context with this buffer */
2079
2080 c->xm_buffer = drawBuffer;
2081 c->xm_read_buffer = readBuffer;
2082 c->use_read_buffer = (drawBuffer != readBuffer);
2083
2084 _mesa_make_current2(c->gl_ctx, drawBuffer->gl_buffer, readBuffer->gl_buffer);
2085
2086 if (c->gl_ctx->Viewport.Width == 0) {
2087 /* initialize viewport to window size */
2088 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2089 c->gl_ctx->Scissor.Width = drawBuffer->width;
2090 c->gl_ctx->Scissor.Height = drawBuffer->height;
2091 }
2092
2093 if (c->xm_visual->gl_visual->rgbMode) {
2094 /*
2095 * Must recompute and set these pixel values because colormap
2096 * can be different for different windows.
2097 */
2098 c->clearpixel = xmesa_color_to_pixel( c,
2099 c->clearcolor[0],
2100 c->clearcolor[1],
2101 c->clearcolor[2],
2102 c->clearcolor[3],
2103 c->xm_visual->undithered_pf);
2104 XMesaSetForeground(c->display, c->xm_buffer->cleargc, c->clearpixel);
2105 }
2106
2107 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2108 c->xm_buffer->wasCurrent = GL_TRUE;
2109 }
2110 else {
2111 /* Detach */
2112 _mesa_make_current2( NULL, NULL, NULL );
2113 }
2114 return GL_TRUE;
2115 }
2116
2117
2118 /*
2119 * Unbind the context c from its buffer.
2120 */
2121 GLboolean XMesaUnbindContext( XMesaContext c )
2122 {
2123 /* A no-op for XFree86 integration purposes */
2124 return GL_TRUE;
2125 }
2126
2127
2128 XMesaContext XMesaGetCurrentContext( void )
2129 {
2130 GET_CURRENT_CONTEXT(ctx);
2131 if (ctx) {
2132 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2133 return xmesa;
2134 }
2135 else {
2136 return 0;
2137 }
2138 }
2139
2140
2141 XMesaBuffer XMesaGetCurrentBuffer( void )
2142 {
2143 GET_CURRENT_CONTEXT(ctx);
2144 if (ctx) {
2145 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2146 return xmesa->xm_buffer;
2147 }
2148 else {
2149 return 0;
2150 }
2151 }
2152
2153
2154 /* New in Mesa 3.1 */
2155 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2156 {
2157 GET_CURRENT_CONTEXT(ctx);
2158 if (ctx) {
2159 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2160 return xmesa->xm_buffer;
2161 }
2162 else {
2163 return 0;
2164 }
2165 }
2166
2167
2168 GLboolean XMesaForceCurrent(XMesaContext c)
2169 {
2170 if (c) {
2171 if (c->gl_ctx != _mesa_get_current_context()) {
2172 _mesa_make_current(c->gl_ctx, c->xm_buffer->gl_buffer);
2173 }
2174 }
2175 else {
2176 _mesa_make_current(NULL, NULL);
2177 }
2178 return GL_TRUE;
2179 }
2180
2181
2182 GLboolean XMesaLoseCurrent(XMesaContext c)
2183 {
2184 (void) c;
2185 _mesa_make_current(NULL, NULL);
2186 return GL_TRUE;
2187 }
2188
2189
2190 /*
2191 * Switch 3Dfx support hack between window and full-screen mode.
2192 */
2193 GLboolean XMesaSetFXmode( GLint mode )
2194 {
2195 #ifdef FX
2196 const char *fx = getenv("MESA_GLX_FX");
2197 if (fx && fx[0] != 'd') {
2198 GET_CURRENT_CONTEXT(ctx);
2199 GrHwConfiguration hw;
2200 if (!FX_grSstQueryHardware(&hw)) {
2201 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2202 return GL_FALSE;
2203 }
2204 if (hw.num_sst < 1) {
2205 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2206 return GL_FALSE;
2207 }
2208 if (ctx) {
2209 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2210 if (mode == XMESA_FX_WINDOW) {
2211 if (xmesa->xm_buffer->FXisHackUsable) {
2212 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2213 xmesa->xm_buffer->FXwindowHack = GL_TRUE;
2214 return GL_TRUE;
2215 }
2216 }
2217 else if (mode == XMESA_FX_FULLSCREEN) {
2218 FX_grSstControl(GR_CONTROL_ACTIVATE);
2219 xmesa->xm_buffer->FXwindowHack = GL_FALSE;
2220 return GL_TRUE;
2221 }
2222 else {
2223 /* Error: Bad mode value */
2224 }
2225 }
2226 }
2227 /*fprintf(stderr, "fallthrough\n");*/
2228 #else
2229 (void) mode;
2230 #endif
2231 return GL_FALSE;
2232 }
2233
2234
2235
2236 #ifdef FX
2237 /*
2238 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2239 */
2240 static void FXgetImage( XMesaBuffer b )
2241 {
2242 static unsigned short pixbuf[MAX_WIDTH];
2243 GLuint x, y;
2244 int xpos, ypos;
2245 XMesaWindow root;
2246 unsigned int bw, depth, width, height;
2247 XMesaContext xmesa = (XMesaContext) b->xm_context->gl_ctx->DriverCtx;
2248
2249 assert(xmesa->xm_buffer->FXctx);
2250
2251 #ifdef XFree86Server
2252 x = b->frontbuffer->x;
2253 y = b->frontbuffer->y;
2254 width = b->frontbuffer->width;
2255 height = b->frontbuffer->height;
2256 depth = b->frontbuffer->depth;
2257 #else
2258 XGetGeometry( xmesa->xm_visual->display, b->frontbuffer,
2259 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2260 #endif
2261 if (b->width != width || b->height != height) {
2262 b->width = MIN2((int)width, xmesa->xm_buffer->FXctx->width);
2263 b->height = MIN2((int)height, xmesa->xm_buffer->FXctx->height);
2264 if (b->width & 1)
2265 b->width--; /* prevent odd width */
2266 xmesa_alloc_back_buffer( b );
2267 }
2268
2269 grLfbWriteColorFormat(GR_COLORFORMAT_ARGB);
2270 if (xmesa->xm_visual->undithered_pf==PF_5R6G5B) {
2271 /* Special case: 16bpp RGB */
2272 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2273 0, xmesa->xm_buffer->FXctx->height - b->height, /*pos*/
2274 b->width, b->height, /* size */
2275 b->width * sizeof(GLushort), /* stride */
2276 b->backimage->data); /* dest buffer */
2277 }
2278 else if (xmesa->xm_visual->dithered_pf==PF_DITHER
2279 && GET_VISUAL_DEPTH(xmesa->xm_visual)==8) {
2280 /* Special case: 8bpp RGB */
2281 for (y=0;y<b->height;y++) {
2282 GLubyte *ptr = (GLubyte*) xmesa->xm_buffer->backimage->data
2283 + xmesa->xm_buffer->backimage->bytes_per_line * y;
2284 XDITHER_SETUP(y);
2285
2286 /* read row from 3Dfx frame buffer */
2287 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2288 0, xmesa->xm_buffer->FXctx->height-(b->height-y),
2289 b->width, 1,
2290 0,
2291 pixbuf );
2292
2293 /* write to XImage back buffer */
2294 for (x=0;x<b->width;x++) {
2295 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2296 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2297 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2298 *ptr++ = XDITHER( x, r, g, b);
2299 }
2300 }
2301 }
2302 else {
2303 /* General case: slow! */
2304 for (y=0;y<b->height;y++) {
2305 /* read row from 3Dfx frame buffer */
2306 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2307 0, xmesa->xm_buffer->FXctx->height-(b->height-y),
2308 b->width, 1,
2309 0,
2310 pixbuf );
2311
2312 /* write to XImage back buffer */
2313 for (x=0;x<b->width;x++) {
2314 XMesaPutPixel(b->backimage,x,y,
2315 xmesa_color_to_pixel(xmesa,
2316 (pixbuf[x] & 0xf800) >> 8,
2317 (pixbuf[x] & 0x07e0) >> 3,
2318 (pixbuf[x] & 0x001f) << 3,
2319 0xff, xmesa->pixelformat));
2320 }
2321 }
2322 }
2323 grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
2324 }
2325 #endif
2326
2327
2328 /*
2329 * Copy the back buffer to the front buffer. If there's no back buffer
2330 * this is a no-op.
2331 */
2332 void XMesaSwapBuffers( XMesaBuffer b )
2333 {
2334 GET_CURRENT_CONTEXT(ctx);
2335
2336 /* If we're swapping the buffer associated with the current context
2337 * we have to flush any pending rendering commands first.
2338 */
2339 if (b->xm_context && b->xm_context->gl_ctx == ctx)
2340 _mesa_swapbuffers(ctx);
2341
2342 if (b->db_state) {
2343 #ifdef FX
2344 if (b->FXctx) {
2345 fxMesaSwapBuffers();
2346
2347 if (b->FXwindowHack)
2348 FXgetImage(b);
2349 else
2350 return;
2351 }
2352 #endif
2353 if (b->backimage) {
2354 /* Copy Ximage from host's memory to server's window */
2355 #if defined(USE_XSHM) && !defined(XFree86Server)
2356 if (b->shm) {
2357 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2358 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2359 b->cleargc,
2360 b->backimage, 0, 0,
2361 0, 0, b->width, b->height, False );
2362 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2363 }
2364 else
2365 #endif
2366 {
2367 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
2368 XMesaDriSwapBuffers( b );
2369 #else
2370 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2371 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2372 b->cleargc,
2373 b->backimage, 0, 0,
2374 0, 0, b->width, b->height );
2375 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2376 #endif
2377 }
2378 }
2379 else {
2380 /* Copy pixmap to window on server */
2381 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2382 XMesaCopyArea( b->xm_visual->display,
2383 b->backpixmap, /* source drawable */
2384 b->frontbuffer, /* dest. drawable */
2385 b->cleargc,
2386 0, 0, b->width, b->height, /* source region */
2387 0, 0 /* dest region */
2388 );
2389 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2390 }
2391 }
2392 #if !defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
2393 XSync( b->xm_visual->display, False );
2394 #endif
2395 }
2396
2397
2398
2399 /*
2400 * Copy sub-region of back buffer to front buffer
2401 */
2402 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2403 {
2404 GET_CURRENT_CONTEXT(ctx);
2405
2406 /* If we're swapping the buffer associated with the current context
2407 * we have to flush any pending rendering commands first.
2408 */
2409 if (b->xm_context->gl_ctx == ctx)
2410 _mesa_swapbuffers(ctx);
2411
2412 if (b->db_state) {
2413 int yTop = b->height - y - height;
2414 #ifdef FX
2415 if (b->FXctx) {
2416 fxMesaSwapBuffers();
2417 if (b->FXwindowHack)
2418 FXgetImage(b);
2419 else
2420 return;
2421 }
2422 #endif
2423 if (b->backimage) {
2424 /* Copy Ximage from host's memory to server's window */
2425 #if defined(USE_XSHM) && !defined(XFree86Server)
2426 if (b->shm) {
2427 /* XXX assuming width and height aren't too large! */
2428 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2429 b->cleargc,
2430 b->backimage, x, yTop,
2431 x, yTop, width, height, False );
2432 /* wait for finished event??? */
2433 }
2434 else
2435 #endif
2436 {
2437 /* XXX assuming width and height aren't too large! */
2438 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2439 b->cleargc,
2440 b->backimage, x, yTop,
2441 x, yTop, width, height );
2442 }
2443 }
2444 else {
2445 /* Copy pixmap to window on server */
2446 XMesaCopyArea( b->xm_visual->display,
2447 b->backpixmap, /* source drawable */
2448 b->frontbuffer, /* dest. drawable */
2449 b->cleargc,
2450 x, yTop, width, height, /* source region */
2451 x, yTop /* dest region */
2452 );
2453 }
2454 }
2455 }
2456
2457
2458 /*
2459 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2460 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2461 * back buffer directly.
2462 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2463 * ximage - pointer to back buffer's XImage, or NULL
2464 * Return: GL_TRUE = context is double buffered
2465 * GL_FALSE = context is single buffered
2466 */
2467 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2468 XMesaPixmap *pixmap,
2469 XMesaImage **ximage )
2470 {
2471 if (b->db_state) {
2472 if (pixmap) *pixmap = b->backpixmap;
2473 if (ximage) *ximage = b->backimage;
2474 return GL_TRUE;
2475 }
2476 else {
2477 *pixmap = 0;
2478 *ximage = NULL;
2479 return GL_FALSE;
2480 }
2481 }
2482
2483
2484 /*
2485 * Return the depth buffer associated with an XMesaBuffer.
2486 * Input: b - the XMesa buffer handle
2487 * Output: width, height - size of buffer in pixels
2488 * bytesPerValue - bytes per depth value (2 or 4)
2489 * buffer - pointer to depth buffer values
2490 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2491 */
2492 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2493 GLint *bytesPerValue, void **buffer )
2494 {
2495 if ((!b->gl_buffer) || (!b->gl_buffer->DepthBuffer)) {
2496 *width = 0;
2497 *height = 0;
2498 *bytesPerValue = 0;
2499 *buffer = 0;
2500 return GL_FALSE;
2501 }
2502 else {
2503 *width = b->gl_buffer->Width;
2504 *height = b->gl_buffer->Height;
2505 *bytesPerValue = sizeof(GLdepth);
2506 *buffer = b->gl_buffer->DepthBuffer;
2507 return GL_TRUE;
2508 }
2509 }
2510
2511
2512 void XMesaFlush( XMesaContext c )
2513 {
2514 if (c && c->xm_visual) {
2515 #ifdef XFree86Server
2516 /* NOT_NEEDED */
2517 #else
2518 XSync( c->xm_visual->display, False );
2519 #endif
2520 }
2521 }
2522
2523
2524
2525 const char *XMesaGetString( XMesaContext c, int name )
2526 {
2527 (void) c;
2528 if (name==XMESA_VERSION) {
2529 return "3.1";
2530 }
2531 else if (name==XMESA_EXTENSIONS) {
2532 return "";
2533 }
2534 else {
2535 return NULL;
2536 }
2537 }
2538
2539
2540
2541 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2542 {
2543 XMesaBuffer b;
2544 for (b=XMesaBufferList; b; b=b->Next) {
2545 if (b->frontbuffer==d && b->display==dpy) {
2546 return b;
2547 }
2548 }
2549 return NULL;
2550 }
2551
2552
2553
2554 /*
2555 * Look for XMesaBuffers whose X window has been destroyed.
2556 * Deallocate any such XMesaBuffers.
2557 */
2558 void XMesaGarbageCollect( void )
2559 {
2560 XMesaBuffer b, next;
2561 for (b=XMesaBufferList; b; b=next) {
2562 next = b->Next;
2563 if (!b->pixmap_flag) {
2564 #ifdef XFree86Server
2565 /* NOT_NEEDED */
2566 #else
2567 XSync(b->display, False);
2568 if (!window_exists( b->display, b->frontbuffer )) {
2569 /* found a dead window, free the ancillary info */
2570 XMesaDestroyBuffer( b );
2571 }
2572 #endif
2573 }
2574 }
2575 }
2576
2577
2578 void XMesaReset( void )
2579 {
2580 while (XMesaBufferList)
2581 XMesaDestroyBuffer(XMesaBufferList);
2582
2583 XMesaBufferList = NULL;
2584 }
2585
2586
2587 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2588 GLfloat red, GLfloat green,
2589 GLfloat blue, GLfloat alpha )
2590 {
2591 GLint r = (GLint) (red * 255.0F);
2592 GLint g = (GLint) (green * 255.0F);
2593 GLint b = (GLint) (blue * 255.0F);
2594 GLint a = (GLint) (alpha * 255.0F);
2595
2596 switch (xmesa->pixelformat) {
2597 case PF_INDEX:
2598 return 0;
2599 case PF_TRUECOLOR:
2600 {
2601 unsigned long p;
2602 PACK_TRUECOLOR( p, r, g, b );
2603 return p;
2604 }
2605 case PF_8A8B8G8R:
2606 return PACK_8A8B8G8R( r, g, b, a );
2607 case PF_8R8G8B:
2608 return PACK_8R8G8B( r, g, b );
2609 case PF_5R6G5B:
2610 return PACK_5R6G5B( r, g, b );
2611 case PF_DITHER:
2612 {
2613 DITHER_SETUP;
2614 return DITHER( x, y, r, g, b );
2615 }
2616 case PF_1BIT:
2617 /* 382 = (3*255)/2 */
2618 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2619 case PF_HPCR:
2620 return DITHER_HPCR(x, y, r, g, b);
2621 case PF_LOOKUP:
2622 {
2623 LOOKUP_SETUP;
2624 return LOOKUP( r, g, b );
2625 }
2626 case PF_GRAYSCALE:
2627 return GRAY_RGB( r, g, b );
2628 case PF_DITHER_5R6G5B:
2629 /* fall through */
2630 case PF_TRUEDITHER:
2631 {
2632 unsigned long p;
2633 PACK_TRUEDITHER(p, x, y, r, g, b);
2634 return p;
2635 }
2636 default:
2637 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2638 }
2639 return 0;
2640 }
2641
2642