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use wrappers from imports.h rather than stdio, stdlib, etc functions.
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /* $Id: xm_api.c,v 1.50 2002/10/30 20:24:46 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 5.0
6 *
7 * Copyright (C) 1999-2002 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 /* $XFree86: xc/extras/Mesa/src/X/xm_api.c,v 1.2 2002/02/26 23:37:31 tsi Exp $ */
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 "imports.h"
73 #include "matrix.h"
74 #include "mmath.h"
75 #include "mtypes.h"
76 #include "macros.h"
77 #include "texformat.h"
78 #include "texstore.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 * Return the host's byte order as LSBFirst or MSBFirst ala X.
165 */
166 #ifndef XFree86Server
167 static int host_byte_order( void )
168 {
169 int i = 1;
170 char *cptr = (char *) &i;
171 return (*cptr==1) ? LSBFirst : MSBFirst;
172 }
173 #endif
174
175
176 /*
177 * Error handling.
178 */
179 #ifndef XFree86Server
180 static int mesaXErrorFlag = 0;
181
182 static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
183 {
184 (void) dpy;
185 (void) event;
186 mesaXErrorFlag = 1;
187 return 0;
188 }
189 #endif
190
191
192 /*
193 * Check if the X Shared Memory extension is available.
194 * Return: 0 = not available
195 * 1 = shared XImage support available
196 * 2 = shared Pixmap support available also
197 */
198 #ifndef XFree86Server
199 static int check_for_xshm( XMesaDisplay *display )
200 {
201 #ifdef USE_XSHM
202 int major, minor, ignore;
203 Bool pixmaps;
204
205 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
206 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
207 return (pixmaps==True) ? 2 : 1;
208 }
209 else {
210 return 0;
211 }
212 }
213 else {
214 return 0;
215 }
216 #else
217 /* Can't compile XSHM support */
218 return 0;
219 #endif
220 }
221 #endif
222
223
224 /*
225 * Return the width and height of the given drawable.
226 */
227 static void get_drawable_size( XMesaDisplay *dpy, XMesaDrawable d,
228 unsigned int *width, unsigned int *height)
229 {
230 #ifdef XFree86Server
231 (void) dpy;
232 *width = d->width;
233 *height = d->height;
234 #else
235 Window root;
236 int x, y;
237 unsigned int bw, depth;
238
239 _glthread_LOCK_MUTEX(_xmesa_lock);
240 XGetGeometry( dpy, d, &root, &x, &y, width, height, &bw, &depth );
241 _glthread_UNLOCK_MUTEX(_xmesa_lock);
242 #endif
243 }
244
245
246 /*
247 * Apply gamma correction to an intensity value in [0..max]. Return the
248 * new intensity value.
249 */
250 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
251 {
252 if (gamma == 1.0) {
253 return value;
254 }
255 else {
256 double x = (double) value / (double) max;
257 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
258 }
259 }
260
261
262
263 /*
264 * Return the true number of bits per pixel for XImages.
265 * For example, if we request a 24-bit deep visual we may actually need/get
266 * 32bpp XImages. This function returns the appropriate bpp.
267 * Input: dpy - the X display
268 * visinfo - desribes the visual to be used for XImages
269 * Return: true number of bits per pixel for XImages
270 */
271 #ifdef XFree86Server
272
273 static int bits_per_pixel( XMesaVisual xmv )
274 {
275 XMesaVisualInfo visinfo = xmv->visinfo;
276 const int depth = visinfo->nplanes;
277 int i;
278 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
279 if (screenInfo.formats[i].depth == depth)
280 return screenInfo.formats[i].bitsPerPixel;
281 }
282 return depth; /* should never get here, but this should be safe */
283 }
284
285 #else
286
287 static int bits_per_pixel( XMesaVisual xmv )
288 {
289 XMesaDisplay *dpy = xmv->display;
290 XMesaVisualInfo visinfo = xmv->visinfo;
291 XMesaImage *img;
292 int bitsPerPixel;
293 /* Create a temporary XImage */
294 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
295 ZPixmap, 0, /*format, offset*/
296 (char*) MALLOC(8), /*data*/
297 1, 1, /*width, height*/
298 32, /*bitmap_pad*/
299 0 /*bytes_per_line*/
300 );
301 assert(img);
302 /* grab the bits/pixel value */
303 bitsPerPixel = img->bits_per_pixel;
304 /* free the XImage */
305 FREE( img->data );
306 img->data = NULL;
307 XMesaDestroyImage( img );
308 return bitsPerPixel;
309 }
310 #endif
311
312
313
314 /*
315 * Determine if a given X window ID is valid (window exists).
316 * Do this by calling XGetWindowAttributes() for the window and
317 * checking if we catch an X error.
318 * Input: dpy - the display
319 * win - the window to check for existance
320 * Return: GL_TRUE - window exists
321 * GL_FALSE - window doesn't exist
322 */
323 #ifndef XFree86Server
324 static GLboolean WindowExistsFlag;
325
326 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
327 {
328 (void) dpy;
329 if (xerr->error_code == BadWindow) {
330 WindowExistsFlag = GL_FALSE;
331 }
332 return 0;
333 }
334
335 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
336 {
337 XWindowAttributes wa;
338 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
339 WindowExistsFlag = GL_TRUE;
340 old_handler = XSetErrorHandler(window_exists_err_handler);
341 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
342 XSetErrorHandler(old_handler);
343 return WindowExistsFlag;
344 }
345 #endif
346
347
348
349 /**********************************************************************/
350 /***** Linked list of XMesaBuffers *****/
351 /**********************************************************************/
352
353 static XMesaBuffer XMesaBufferList = NULL;
354
355
356 /* Allocate a new XMesaBuffer, add to linked list */
357 static XMesaBuffer alloc_xmesa_buffer(void)
358 {
359 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
360 if (b) {
361 b->Next = XMesaBufferList;
362 XMesaBufferList = b;
363 }
364 return b;
365 }
366
367
368 /*
369 * Find an XMesaBuffer by matching X display and colormap but NOT matching
370 * the notThis buffer.
371 */
372 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
373 XMesaColormap cmap,
374 XMesaBuffer notThis)
375 {
376 XMesaBuffer b;
377 for (b=XMesaBufferList; b; b=b->Next) {
378 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
379 return b;
380 }
381 }
382 return NULL;
383 }
384
385
386 /*
387 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
388 * entries.
389 */
390 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
391 {
392 XMesaBuffer prev = NULL, b;
393 (void) client;
394 for (b=XMesaBufferList; b; b=b->Next) {
395 if (b==buffer) {
396 /* unlink bufer from list */
397 if (prev)
398 prev->Next = buffer->Next;
399 else
400 XMesaBufferList = buffer->Next;
401 /* Check to free X colors */
402 if (buffer->num_alloced>0) {
403 /* If no other buffer uses this X colormap then free the colors. */
404 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
405 #ifdef XFree86Server
406 (void)FreeColors(buffer->cmap, client,
407 buffer->num_alloced, buffer->alloced_colors,
408 0);
409 #else
410 XFreeColors(buffer->display, buffer->cmap,
411 buffer->alloced_colors, buffer->num_alloced, 0);
412 #endif
413 }
414 }
415
416 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
417 FREE(buffer);
418
419 return;
420 }
421 /* continue search */
422 prev = b;
423 }
424 /* buffer not found in XMesaBufferList */
425 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
426 }
427
428
429 /* Copy X color table stuff from one XMesaBuffer to another. */
430 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
431 {
432 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
433 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
434 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
435 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
436 dst->num_alloced = src->num_alloced;
437 MEMCPY(dst->alloced_colors, src->alloced_colors,
438 sizeof(src->alloced_colors));
439 }
440
441
442
443 /**********************************************************************/
444 /***** Misc Private Functions *****/
445 /**********************************************************************/
446
447
448 /*
449 * Return number of bits set in n.
450 */
451 static int bitcount( unsigned long n )
452 {
453 int bits;
454 for (bits=0; n>0; n=n>>1) {
455 if (n&1) {
456 bits++;
457 }
458 }
459 return bits;
460 }
461
462
463
464 /*
465 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
466 * Return: GL_TRUE if success, GL_FALSE if error
467 */
468 #ifndef XFree86Server
469 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
470 {
471 #ifdef USE_XSHM
472 /*
473 * We have to do a _lot_ of error checking here to be sure we can
474 * really use the XSHM extension. It seems different servers trigger
475 * errors at different points if the extension won't work. Therefore
476 * we have to be very careful...
477 */
478 GC gc;
479 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
480
481 b->backimage = XShmCreateImage( b->xm_visual->display,
482 b->xm_visual->visinfo->visual,
483 b->xm_visual->visinfo->depth,
484 ZPixmap, NULL, &b->shminfo,
485 b->width, b->height );
486 if (b->backimage == NULL) {
487 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
488 b->shm = 0;
489 return GL_FALSE;
490 }
491
492 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
493 * b->backimage->height, IPC_CREAT|0777 );
494 if (b->shminfo.shmid < 0) {
495 _mesa_warning(NULL, "shmget failed while allocating back buffer");
496 XDestroyImage( b->backimage );
497 b->backimage = NULL;
498 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.");
499 b->shm = 0;
500 return GL_FALSE;
501 }
502
503 b->shminfo.shmaddr = b->backimage->data
504 = (char*)shmat( b->shminfo.shmid, 0, 0 );
505 if (b->shminfo.shmaddr == (char *) -1) {
506 _mesa_warning(NULL, "shmat() failed while allocating back buffer");
507 XDestroyImage( b->backimage );
508 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
509 b->backimage = NULL;
510 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.");
511 b->shm = 0;
512 return GL_FALSE;
513 }
514
515 b->shminfo.readOnly = False;
516 mesaXErrorFlag = 0;
517 old_handler = XSetErrorHandler( mesaHandleXError );
518 /* This may trigger the X protocol error we're ready to catch: */
519 XShmAttach( b->xm_visual->display, &b->shminfo );
520 XSync( b->xm_visual->display, False );
521
522 if (mesaXErrorFlag) {
523 /* we are on a remote display, this error is normal, don't print it */
524 XFlush( b->xm_visual->display );
525 mesaXErrorFlag = 0;
526 XDestroyImage( b->backimage );
527 shmdt( b->shminfo.shmaddr );
528 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
529 b->backimage = NULL;
530 b->shm = 0;
531 (void) XSetErrorHandler( old_handler );
532 return GL_FALSE;
533 }
534
535 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
536
537 /* Finally, try an XShmPutImage to be really sure the extension works */
538 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
539 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
540 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
541 XSync( b->xm_visual->display, False );
542 XFreeGC( b->xm_visual->display, gc );
543 (void) XSetErrorHandler( old_handler );
544 if (mesaXErrorFlag) {
545 XFlush( b->xm_visual->display );
546 mesaXErrorFlag = 0;
547 XDestroyImage( b->backimage );
548 shmdt( b->shminfo.shmaddr );
549 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
550 b->backimage = NULL;
551 b->shm = 0;
552 return GL_FALSE;
553 }
554
555 if (b->backimage) {
556 int height = b->backimage->height;
557 /* Needed by PIXELADDR1 macro */
558 b->ximage_width1 = b->backimage->bytes_per_line;
559 b->ximage_origin1 = (GLubyte *) b->backimage->data
560 + b->ximage_width1 * (height-1);
561 /* Needed by PIXELADDR2 macro */
562 b->ximage_width2 = b->backimage->bytes_per_line / 2;
563 b->ximage_origin2 = (GLushort *) b->backimage->data
564 + b->ximage_width2 * (height-1);
565 /* Needed by PIXELADDR3 macro */
566 b->ximage_width3 = b->backimage->bytes_per_line;
567 b->ximage_origin3 = (GLubyte *) b->backimage->data
568 + b->ximage_width3 * (height-1);
569 /* Needed by PIXELADDR4 macro */
570 b->ximage_width4 = b->backimage->width;
571 b->ximage_origin4 = (GLuint *) b->backimage->data
572 + b->ximage_width4 * (height-1);
573 }
574
575 return GL_TRUE;
576 #else
577 /* Can't compile XSHM support */
578 return GL_FALSE;
579 #endif
580 }
581 #endif
582
583
584
585 /*
586 * Setup an off-screen pixmap or Ximage to use as the back buffer.
587 * Input: b - the X/Mesa buffer
588 */
589 void xmesa_alloc_back_buffer( XMesaBuffer b )
590 {
591 if (b->db_state==BACK_XIMAGE) {
592 /* Deallocate the old backimage, if any */
593 if (b->backimage) {
594 #if defined(USE_XSHM) && !defined(XFree86Server)
595 if (b->shm) {
596 XShmDetach( b->xm_visual->display, &b->shminfo );
597 XDestroyImage( b->backimage );
598 shmdt( b->shminfo.shmaddr );
599 }
600 else
601 #endif
602 XMesaDestroyImage( b->backimage );
603 b->backimage = NULL;
604 }
605
606 /* Allocate new back buffer */
607 #ifdef XFree86Server
608 {
609 /* Allocate a regular XImage for the back buffer. */
610 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
611 b->width, b->height, NULL);
612 #else
613 if (b->shm==0 || alloc_shm_back_buffer(b)==GL_FALSE) {
614 /* Allocate a regular XImage for the back buffer. */
615 b->backimage = XCreateImage( b->xm_visual->display,
616 b->xm_visual->visinfo->visual,
617 GET_VISUAL_DEPTH(b->xm_visual),
618 ZPixmap, 0, /* format, offset */
619 NULL, b->width, b->height,
620 8, 0 ); /* pad, bytes_per_line */
621 #endif
622 if (!b->backimage) {
623 _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.");
624 }
625 b->backimage->data = (char *) MALLOC( b->backimage->height
626 * b->backimage->bytes_per_line );
627 if (!b->backimage->data) {
628 _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.");
629 XMesaDestroyImage( b->backimage );
630 b->backimage = NULL;
631 }
632 }
633 b->backpixmap = None;
634 }
635 else if (b->db_state==BACK_PIXMAP) {
636 XMesaPixmap old_pixmap = b->backpixmap;
637 /* Free the old back pixmap */
638 if (b->backpixmap) {
639 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
640 }
641 /* Allocate new back pixmap */
642 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
643 b->width, b->height,
644 GET_VISUAL_DEPTH(b->xm_visual) );
645 b->backimage = NULL;
646 /* update other references to backpixmap */
647 if (b->buffer==(XMesaDrawable)old_pixmap) {
648 b->buffer = (XMesaDrawable)b->backpixmap;
649 }
650 }
651 }
652
653
654
655 /*
656 * A replacement for XAllocColor. This function should never
657 * fail to allocate a color. When XAllocColor fails, we return
658 * the nearest matching color. If we have to allocate many colors
659 * this function isn't too efficient; the XQueryColors() could be
660 * done just once.
661 * Written by Michael Pichler, Brian Paul, Mark Kilgard
662 * Input: dpy - X display
663 * cmap - X colormap
664 * cmapSize - size of colormap
665 * In/Out: color - the XColor struct
666 * Output: exact - 1=exact color match, 0=closest match
667 * alloced - 1=XAlloc worked, 0=XAlloc failed
668 */
669 static void
670 noFaultXAllocColor( int client,
671 XMesaDisplay *dpy,
672 XMesaColormap cmap,
673 int cmapSize,
674 XMesaColor *color,
675 int *exact, int *alloced )
676 {
677 #ifdef XFree86Server
678 Pixel *ppixIn;
679 xrgb *ctable;
680 #else
681 /* we'll try to cache ctable for better remote display performance */
682 static Display *prevDisplay = NULL;
683 static XMesaColormap prevCmap = 0;
684 static int prevCmapSize = 0;
685 static XMesaColor *ctable = NULL;
686 #endif
687 XMesaColor subColor;
688 int i, bestmatch;
689 double mindist; /* 3*2^16^2 exceeds long int precision. */
690
691 (void) client;
692
693 /* First try just using XAllocColor. */
694 #ifdef XFree86Server
695 if (AllocColor(cmap,
696 &color->red, &color->green, &color->blue,
697 &color->pixel,
698 client) == Success) {
699 #else
700 if (XAllocColor(dpy, cmap, color)) {
701 #endif
702 *exact = 1;
703 *alloced = 1;
704 return;
705 }
706
707 /* Alloc failed, search for closest match */
708
709 /* Retrieve color table entries. */
710 /* XXX alloca candidate. */
711 #ifdef XFree86Server
712 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
713 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
714 for (i = 0; i < cmapSize; i++) {
715 ppixIn[i] = i;
716 }
717 QueryColors(cmap, cmapSize, ppixIn, ctable);
718 #else
719 if (prevDisplay != dpy || prevCmap != cmap
720 || prevCmapSize != cmapSize || !ctable) {
721 /* free previously cached color table */
722 if (ctable)
723 FREE(ctable);
724 /* Get the color table from X */
725 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
726 assert(ctable);
727 for (i = 0; i < cmapSize; i++) {
728 ctable[i].pixel = i;
729 }
730 XQueryColors(dpy, cmap, ctable, cmapSize);
731 prevDisplay = dpy;
732 prevCmap = cmap;
733 prevCmapSize = cmapSize;
734 }
735 #endif
736
737 /* Find best match. */
738 bestmatch = -1;
739 mindist = 0.0;
740 for (i = 0; i < cmapSize; i++) {
741 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
742 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
743 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
744 double dist = dr * dr + dg * dg + db * db;
745 if (bestmatch < 0 || dist < mindist) {
746 bestmatch = i;
747 mindist = dist;
748 }
749 }
750
751 /* Return result. */
752 subColor.red = ctable[bestmatch].red;
753 subColor.green = ctable[bestmatch].green;
754 subColor.blue = ctable[bestmatch].blue;
755 /* Try to allocate the closest match color. This should only
756 * fail if the cell is read/write. Otherwise, we're incrementing
757 * the cell's reference count.
758 */
759 #ifdef XFree86Server
760 if (AllocColor(cmap,
761 &subColor.red, &subColor.green, &subColor.blue,
762 &subColor.pixel,
763 client) == Success) {
764 #else
765 if (XAllocColor(dpy, cmap, &subColor)) {
766 #endif
767 *alloced = 1;
768 }
769 else {
770 /* do this to work around a problem reported by Frank Ortega */
771 subColor.pixel = (unsigned long) bestmatch;
772 subColor.red = ctable[bestmatch].red;
773 subColor.green = ctable[bestmatch].green;
774 subColor.blue = ctable[bestmatch].blue;
775 subColor.flags = DoRed | DoGreen | DoBlue;
776 *alloced = 0;
777 }
778 #ifdef XFree86Server
779 FREE(ppixIn);
780 FREE(ctable);
781 #else
782 /* don't free table, save it for next time */
783 #endif
784
785 *color = subColor;
786 *exact = 0;
787 }
788
789
790
791
792 /*
793 * Do setup for PF_GRAYSCALE pixel format.
794 * Note that buffer may be NULL.
795 */
796 static GLboolean setup_grayscale( int client, XMesaVisual v,
797 XMesaBuffer buffer, XMesaColormap cmap )
798 {
799 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
800 return GL_FALSE;
801 }
802
803 if (buffer) {
804 XMesaBuffer prevBuffer;
805
806 if (!cmap) {
807 return GL_FALSE;
808 }
809
810 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
811 if (prevBuffer &&
812 (buffer->xm_visual->mesa_visual.rgbMode ==
813 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
814 /* Copy colormap stuff from previous XMesaBuffer which uses same
815 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
816 */
817 copy_colortable_info(buffer, prevBuffer);
818 }
819 else {
820 /* Allocate 256 shades of gray */
821 int gray;
822 int colorsfailed = 0;
823 for (gray=0;gray<256;gray++) {
824 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
825 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
826 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
827 int exact, alloced;
828 XMesaColor xcol;
829 xcol.red = (r << 8) | r;
830 xcol.green = (g << 8) | g;
831 xcol.blue = (b << 8) | b;
832 noFaultXAllocColor( client, v->display,
833 cmap, GET_COLORMAP_SIZE(v),
834 &xcol, &exact, &alloced );
835 if (!exact) {
836 colorsfailed++;
837 }
838 if (alloced) {
839 assert(buffer->num_alloced<256);
840 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
841 buffer->num_alloced++;
842 }
843
844 /*OLD
845 assert(gray < 576);
846 buffer->color_table[gray*3+0] = xcol.pixel;
847 buffer->color_table[gray*3+1] = xcol.pixel;
848 buffer->color_table[gray*3+2] = xcol.pixel;
849 assert(xcol.pixel < 65536);
850 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
851 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
852 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
853 */
854 buffer->color_table[gray] = xcol.pixel;
855 assert(xcol.pixel < 65536);
856 buffer->pixel_to_r[xcol.pixel] = gray;
857 buffer->pixel_to_g[xcol.pixel] = gray;
858 buffer->pixel_to_b[xcol.pixel] = gray;
859 }
860
861 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
862 _mesa_warning(NULL,
863 "Note: %d out of 256 needed colors do not match exactly.\n",
864 colorsfailed );
865 }
866 }
867 }
868
869 v->dithered_pf = PF_GRAYSCALE;
870 v->undithered_pf = PF_GRAYSCALE;
871 return GL_TRUE;
872 }
873
874
875
876 /*
877 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
878 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
879 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
880 * color. While this function was originally designed just for 8-bit
881 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
882 * Dithering code contributed by Bob Mercier.
883 */
884 static GLboolean setup_dithered_color( int client, XMesaVisual v,
885 XMesaBuffer buffer, XMesaColormap cmap )
886 {
887 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
888 return GL_FALSE;
889 }
890
891 if (buffer) {
892 XMesaBuffer prevBuffer;
893
894 if (!cmap) {
895 return GL_FALSE;
896 }
897
898 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
899 if (prevBuffer &&
900 (buffer->xm_visual->mesa_visual.rgbMode ==
901 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
902 /* Copy colormap stuff from previous, matching XMesaBuffer.
903 * Do this to avoid time spent in noFaultXAllocColor.
904 */
905 copy_colortable_info(buffer, prevBuffer);
906 }
907 else {
908 /* Allocate X colors and initialize color_table[], red_table[], etc */
909 int r, g, b, i;
910 int colorsfailed = 0;
911 for (r = 0; r < _R; r++) {
912 for (g = 0; g < _G; g++) {
913 for (b = 0; b < _B; b++) {
914 XMesaColor xcol;
915 int exact, alloced;
916 xcol.red =gamma_adjust(v->RedGamma, r*65535/(_R-1),65535);
917 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(_G-1),65535);
918 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(_B-1),65535);
919 noFaultXAllocColor( client, v->display,
920 cmap, GET_COLORMAP_SIZE(v),
921 &xcol, &exact, &alloced );
922 if (!exact) {
923 colorsfailed++;
924 }
925 if (alloced) {
926 assert(buffer->num_alloced<256);
927 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
928 buffer->num_alloced++;
929 }
930 i = _MIX( r, g, b );
931 assert(i < 576);
932 buffer->color_table[i] = xcol.pixel;
933 assert(xcol.pixel < 65536);
934 buffer->pixel_to_r[xcol.pixel] = r * 255 / (_R-1);
935 buffer->pixel_to_g[xcol.pixel] = g * 255 / (_G-1);
936 buffer->pixel_to_b[xcol.pixel] = b * 255 / (_B-1);
937 }
938 }
939 }
940
941 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
942 _mesa_warning(NULL,
943 "Note: %d out of %d needed colors do not match exactly.\n",
944 colorsfailed, _R*_G*_B );
945 }
946 }
947 }
948
949 v->dithered_pf = PF_DITHER;
950 v->undithered_pf = PF_LOOKUP;
951 return GL_TRUE;
952 }
953
954
955 /*
956 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
957 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
958 * Special dithering tables have to be initialized.
959 */
960 static void setup_8bit_hpcr( XMesaVisual v )
961 {
962 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
963 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
964 * on the root window AND the colormap obtainable by XGetRGBColormaps
965 * for that atom must be set on the window. (see also tkInitWindow)
966 * If that colormap is not set, the output will look stripy.
967 */
968
969 /* Setup color tables with gamma correction */
970 int i;
971 double g;
972
973 g = 1.0 / v->RedGamma;
974 for (i=0; i<256; i++) {
975 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
976 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
977 }
978
979 g = 1.0 / v->GreenGamma;
980 for (i=0; i<256; i++) {
981 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
982 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
983 }
984
985 g = 1.0 / v->BlueGamma;
986 for (i=0; i<256; i++) {
987 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
988 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
989 }
990 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
991 v->dithered_pf = PF_HPCR;
992
993 /* which method should I use to clear */
994 /* GL_FALSE: keep the ordinary method */
995 /* GL_TRUE : clear with dither pattern */
996 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
997
998 if (v->hpcr_clear_flag) {
999 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
1000 DefaultRootWindow(v->display),
1001 16, 2, 8);
1002 #ifndef XFree86Server
1003 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
1004 0, 0, 16, 2, AllPlanes, ZPixmap);
1005 #endif
1006 }
1007 }
1008
1009
1010 /*
1011 * Setup RGB rendering for a window with a True/DirectColor visual.
1012 */
1013 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
1014 XMesaColormap cmap )
1015 {
1016 unsigned long rmask, gmask, bmask;
1017 (void) buffer;
1018 (void) cmap;
1019
1020 /* Compute red multiplier (mask) and bit shift */
1021 v->rshift = 0;
1022 rmask = GET_REDMASK(v);
1023 while ((rmask & 1)==0) {
1024 v->rshift++;
1025 rmask = rmask >> 1;
1026 }
1027
1028 /* Compute green multiplier (mask) and bit shift */
1029 v->gshift = 0;
1030 gmask = GET_GREENMASK(v);
1031 while ((gmask & 1)==0) {
1032 v->gshift++;
1033 gmask = gmask >> 1;
1034 }
1035
1036 /* Compute blue multiplier (mask) and bit shift */
1037 v->bshift = 0;
1038 bmask = GET_BLUEMASK(v);
1039 while ((bmask & 1)==0) {
1040 v->bshift++;
1041 bmask = bmask >> 1;
1042 }
1043
1044 /*
1045 * Compute component-to-pixel lookup tables and dithering kernel
1046 */
1047 {
1048 static GLubyte kernel[16] = {
1049 0*16, 8*16, 2*16, 10*16,
1050 12*16, 4*16, 14*16, 6*16,
1051 3*16, 11*16, 1*16, 9*16,
1052 15*16, 7*16, 13*16, 5*16,
1053 };
1054 GLint rBits = bitcount(rmask);
1055 GLint gBits = bitcount(gmask);
1056 GLint bBits = bitcount(bmask);
1057 GLint maxBits;
1058 GLuint i;
1059
1060 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1061 for (i=0; i<=rmask; i++)
1062 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1063 for (i=0; i<=gmask; i++)
1064 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1065 for (i=0; i<=bmask; i++)
1066 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1067
1068 /* convert RGB values from [0,255] to pixel components */
1069
1070 for (i=0;i<256;i++) {
1071 GLint r = gamma_adjust(v->RedGamma, i, 255);
1072 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1073 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1074 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1075 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1076 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1077 }
1078 /* overflow protection */
1079 for (i=256;i<512;i++) {
1080 v->RtoPixel[i] = v->RtoPixel[255];
1081 v->GtoPixel[i] = v->GtoPixel[255];
1082 v->BtoPixel[i] = v->BtoPixel[255];
1083 }
1084
1085 /* setup dithering kernel */
1086 maxBits = rBits;
1087 if (gBits > maxBits) maxBits = gBits;
1088 if (bBits > maxBits) maxBits = bBits;
1089 for (i=0;i<16;i++) {
1090 v->Kernel[i] = kernel[i] >> maxBits;
1091 }
1092
1093 v->undithered_pf = PF_TRUECOLOR;
1094 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_TRUEDITHER : PF_TRUECOLOR;
1095 }
1096
1097 /*
1098 * Now check for TrueColor visuals which we can optimize.
1099 */
1100 if ( GET_REDMASK(v) ==0x0000ff
1101 && GET_GREENMASK(v)==0x00ff00
1102 && GET_BLUEMASK(v) ==0xff0000
1103 && CHECK_BYTE_ORDER(v)
1104 && v->BitsPerPixel==32
1105 && sizeof(GLuint)==4
1106 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1107 /* common 32 bpp config used on SGI, Sun */
1108 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1109 }
1110 else if (GET_REDMASK(v) ==0xff0000
1111 && GET_GREENMASK(v)==0x00ff00
1112 && GET_BLUEMASK(v) ==0x0000ff
1113 && CHECK_BYTE_ORDER(v)
1114 && v->BitsPerPixel==32
1115 && sizeof(GLuint)==4
1116 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1117 /* common 32 bpp config used on Linux, HP, IBM */
1118 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1119 }
1120 else if (GET_REDMASK(v) ==0xff0000
1121 && GET_GREENMASK(v)==0x00ff00
1122 && GET_BLUEMASK(v) ==0x0000ff
1123 && CHECK_BYTE_ORDER(v)
1124 && v->BitsPerPixel==24
1125 && sizeof(GLuint)==4
1126 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1127 /* common packed 24 bpp config used on Linux */
1128 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1129 }
1130 else if (GET_REDMASK(v) ==0xf800
1131 && GET_GREENMASK(v)==0x07e0
1132 && GET_BLUEMASK(v) ==0x001f
1133 && CHECK_BYTE_ORDER(v)
1134 && v->BitsPerPixel==16
1135 && sizeof(GLushort)==2
1136 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1137 /* 5-6-5 color weight on common PC VGA boards */
1138 v->undithered_pf = PF_5R6G5B;
1139 v->dithered_pf = PF_DITHER_5R6G5B;
1140 }
1141 else if (GET_REDMASK(v) ==0xe0
1142 && GET_GREENMASK(v)==0x1c
1143 && GET_BLUEMASK(v) ==0x03
1144 && CHECK_FOR_HPCR(v)) {
1145 setup_8bit_hpcr( v );
1146 }
1147 }
1148
1149
1150
1151 /*
1152 * Setup RGB rendering for a window with a monochrome visual.
1153 */
1154 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1155 {
1156 (void) b;
1157 v->dithered_pf = v->undithered_pf = PF_1BIT;
1158 /* if black=1 then we must flip pixel values */
1159 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1160 }
1161
1162
1163
1164 /*
1165 * When a context is "made current" for the first time, we can finally
1166 * finish initializing the context's visual and buffer information.
1167 * Input: v - the XMesaVisual to initialize
1168 * b - the XMesaBuffer to initialize (may be NULL)
1169 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1170 * window - the window/pixmap we're rendering into
1171 * cmap - the colormap associated with the window/pixmap
1172 * Return: GL_TRUE=success, GL_FALSE=failure
1173 */
1174 static GLboolean initialize_visual_and_buffer( int client,
1175 XMesaVisual v,
1176 XMesaBuffer b,
1177 GLboolean rgb_flag,
1178 XMesaDrawable window,
1179 XMesaColormap cmap )
1180 {
1181 #ifndef XFree86Server
1182 XGCValues gcvalues;
1183 #endif
1184
1185 if (b) {
1186 assert(b->xm_visual == v);
1187 }
1188
1189 /* Save true bits/pixel */
1190 v->BitsPerPixel = bits_per_pixel(v);
1191 assert(v->BitsPerPixel > 0);
1192
1193
1194 if (rgb_flag==GL_FALSE) {
1195 /* COLOR-INDEXED WINDOW:
1196 * Even if the visual is TrueColor or DirectColor we treat it as
1197 * being color indexed. This is weird but might be useful to someone.
1198 */
1199 v->dithered_pf = v->undithered_pf = PF_INDEX;
1200 v->index_bits = GET_VISUAL_DEPTH(v);
1201 }
1202 else {
1203 /* RGB WINDOW:
1204 * We support RGB rendering into almost any kind of visual.
1205 */
1206 int xclass;
1207 xclass = GET_VISUAL_CLASS(v);
1208 if (xclass==TrueColor || xclass==DirectColor) {
1209 setup_truecolor( v, b, cmap );
1210 }
1211 else if (xclass==StaticGray && GET_VISUAL_DEPTH(v)==1) {
1212 setup_monochrome( v, b );
1213 }
1214 else if (xclass==GrayScale || xclass==StaticGray) {
1215 if (!setup_grayscale( client, v, b, cmap )) {
1216 return GL_FALSE;
1217 }
1218 }
1219 else if ((xclass==PseudoColor || xclass==StaticColor)
1220 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1221 if (!setup_dithered_color( client, v, b, cmap )) {
1222 return GL_FALSE;
1223 }
1224 }
1225 else {
1226 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.");
1227 return GL_FALSE;
1228 }
1229 v->index_bits = 0;
1230
1231 if (_mesa_getenv("MESA_NO_DITHER")) {
1232 v->dithered_pf = v->undithered_pf;
1233 }
1234 }
1235
1236
1237 /*
1238 * If MESA_INFO env var is set print out some debugging info
1239 * which can help Brian figure out what's going on when a user
1240 * reports bugs.
1241 */
1242 if (_mesa_getenv("MESA_INFO")) {
1243 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1244 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1245 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1246 _mesa_printf("X/Mesa level = %d\n", v->level);
1247 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1248 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1249 }
1250
1251 if (b && window) {
1252 /* Do window-specific initializations */
1253
1254 /* Window dimensions */
1255 unsigned int w, h;
1256 get_drawable_size( v->display, window, &w, &h );
1257 b->width = w;
1258 b->height = h;
1259
1260 b->frontbuffer = window;
1261
1262 /* Setup for single/double buffering */
1263 if (v->mesa_visual.doubleBufferMode) {
1264 /* Double buffered */
1265 #ifndef XFree86Server
1266 b->shm = check_for_xshm( v->display );
1267 #endif
1268 xmesa_alloc_back_buffer( b );
1269 if (b->db_state==BACK_PIXMAP) {
1270 b->buffer = (XMesaDrawable)b->backpixmap;
1271 }
1272 else {
1273 b->buffer = XIMAGE;
1274 }
1275 }
1276 else {
1277 /* Single Buffered */
1278 b->buffer = b->frontbuffer;
1279 }
1280
1281 /* X11 graphics contexts */
1282 #ifdef XFree86Server
1283 b->gc = CreateScratchGC(v->display, window->depth);
1284 #else
1285 b->gc = XCreateGC( v->display, window, 0, NULL );
1286 #endif
1287 XMesaSetFunction( v->display, b->gc, GXcopy );
1288
1289 /* cleargc - for glClear() */
1290 #ifdef XFree86Server
1291 b->cleargc = CreateScratchGC(v->display, window->depth);
1292 #else
1293 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1294 #endif
1295 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1296
1297 /*
1298 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1299 * Patch contributed by Michael Pichler May 15, 1995.
1300 */
1301 #ifdef XFree86Server
1302 b->swapgc = CreateScratchGC(v->display, window->depth);
1303 {
1304 CARD32 v[1];
1305 v[0] = FALSE;
1306 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1307 }
1308 #else
1309 gcvalues.graphics_exposures = False;
1310 b->swapgc = XCreateGC( v->display, window,
1311 GCGraphicsExposures, &gcvalues);
1312 #endif
1313 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1314 /*
1315 * Set fill style and tile pixmap once for all for HPCR stuff
1316 * (instead of doing it each time in clear_color_HPCR_pixmap())
1317 * Initialize whole stuff
1318 * Patch contributed by Jacques Leroy March 8, 1998.
1319 */
1320 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1321 int i;
1322 for (i=0; i<16; i++)
1323 {
1324 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1325 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1326 }
1327 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1328 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1329 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1330 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1331 }
1332
1333 /* Initialize the row buffer XImage for use in write_color_span() */
1334 #ifdef XFree86Server
1335 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1336 (char *)MALLOC(MAX_WIDTH*4));
1337 #else
1338 b->rowimage = XCreateImage( v->display,
1339 v->visinfo->visual,
1340 v->visinfo->depth,
1341 ZPixmap, 0, /*format, offset*/
1342 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1343 MAX_WIDTH, 1, /*width, height*/
1344 32, /*bitmap_pad*/
1345 0 /*bytes_per_line*/ );
1346 #endif
1347 }
1348
1349 return GL_TRUE;
1350 }
1351
1352
1353
1354 /*
1355 * Convert an RGBA color to a pixel value.
1356 */
1357 unsigned long
1358 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1359 GLuint pixelFormat)
1360 {
1361 switch (pixelFormat) {
1362 case PF_INDEX:
1363 return 0;
1364 case PF_TRUECOLOR:
1365 {
1366 unsigned long p;
1367 PACK_TRUECOLOR( p, r, g, b );
1368 return p;
1369 }
1370 case PF_8A8B8G8R:
1371 return PACK_8A8B8G8R( r, g, b, a );
1372 case PF_8R8G8B:
1373 /* fall through */
1374 case PF_8R8G8B24:
1375 return PACK_8R8G8B( r, g, b );
1376 case PF_5R6G5B:
1377 return PACK_5R6G5B( r, g, b );
1378 case PF_DITHER:
1379 {
1380 DITHER_SETUP;
1381 return DITHER( 1, 0, r, g, b );
1382 }
1383 case PF_1BIT:
1384 /* 382 = (3*255)/2 */
1385 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1386 case PF_HPCR:
1387 return DITHER_HPCR(1, 1, r, g, b);
1388 case PF_LOOKUP:
1389 {
1390 LOOKUP_SETUP;
1391 return LOOKUP( r, g, b );
1392 }
1393 case PF_GRAYSCALE:
1394 return GRAY_RGB( r, g, b );
1395 case PF_TRUEDITHER:
1396 /* fall through */
1397 case PF_DITHER_5R6G5B:
1398 {
1399 unsigned long p;
1400 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1401 return p;
1402 }
1403 default:
1404 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1405 }
1406 return 0;
1407 }
1408
1409
1410 /**********************************************************************/
1411 /***** Public Functions *****/
1412 /**********************************************************************/
1413
1414
1415 /*
1416 * Create a new X/Mesa visual.
1417 * Input: display - X11 display
1418 * visinfo - an XVisualInfo pointer
1419 * rgb_flag - GL_TRUE = RGB mode,
1420 * GL_FALSE = color index mode
1421 * alpha_flag - alpha buffer requested?
1422 * db_flag - GL_TRUE = double-buffered,
1423 * GL_FALSE = single buffered
1424 * stereo_flag - stereo visual?
1425 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1426 * GL_FALSE = use an off-screen pixmap for back buffer
1427 * depth_size - requested bits/depth values, or zero
1428 * stencil_size - requested bits/stencil values, or zero
1429 * accum_red_size - requested bits/red accum values, or zero
1430 * accum_green_size - requested bits/green accum values, or zero
1431 * accum_blue_size - requested bits/blue accum values, or zero
1432 * accum_alpha_size - requested bits/alpha accum values, or zero
1433 * num_samples - number of samples/pixel if multisampling, or zero
1434 * level - visual level, usually 0
1435 * visualCaveat - ala the GLX extension, usually GLX_NONE_EXT
1436 * Return; a new XMesaVisual or 0 if error.
1437 */
1438 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1439 XMesaVisualInfo visinfo,
1440 GLboolean rgb_flag,
1441 GLboolean alpha_flag,
1442 GLboolean db_flag,
1443 GLboolean stereo_flag,
1444 GLboolean ximage_flag,
1445 GLint depth_size,
1446 GLint stencil_size,
1447 GLint accum_red_size,
1448 GLint accum_green_size,
1449 GLint accum_blue_size,
1450 GLint accum_alpha_size,
1451 GLint num_samples,
1452 GLint level,
1453 GLint visualCaveat )
1454 {
1455 char *gamma;
1456 XMesaVisual v;
1457 GLint red_bits, green_bits, blue_bits, alpha_bits;
1458
1459 /* For debugging only */
1460 if (_mesa_getenv("MESA_XSYNC")) {
1461 /* This makes debugging X easier.
1462 * In your debugger, set a breakpoint on _XError to stop when an
1463 * X protocol error is generated.
1464 */
1465 #ifdef XFree86Server
1466 /* NOT_NEEDED */
1467 #else
1468 XSynchronize( display, 1 );
1469 #endif
1470 }
1471
1472 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1473 if (!v) {
1474 return NULL;
1475 }
1476
1477 /*
1478 * In the X server, NULL is passed in for the display. It will have
1479 * to be set before using this visual. See XMesaSetVisualDisplay()
1480 * below.
1481 */
1482 v->display = display;
1483
1484 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1485 * the struct but we may need some of the information contained in it
1486 * at a later time.
1487 */
1488 #ifdef XFree86Server
1489 v->visinfo = visinfo;
1490 #else
1491 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1492 if(!v->visinfo) {
1493 FREE(v);
1494 return NULL;
1495 }
1496 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1497
1498 /* Save a copy of the pointer now so we can find this visual again
1499 * if we need to search for it in find_glx_visual().
1500 */
1501 v->vishandle = visinfo;
1502 #endif
1503
1504 #ifdef XFree86Server
1505 /* Initialize the depth of the screen */
1506 {
1507 PixmapFormatRec *format;
1508
1509 for (format = screenInfo.formats;
1510 format->depth != display->rootDepth;
1511 format++)
1512 ;
1513 v->screen_depth = format->bitsPerPixel;
1514 }
1515 #endif
1516
1517 /* check for MESA_GAMMA environment variable */
1518 gamma = _mesa_getenv("MESA_GAMMA");
1519 if (gamma) {
1520 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1521 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1522 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1523 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1524 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1525 }
1526 else {
1527 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1528 }
1529
1530 v->ximage_flag = ximage_flag;
1531 v->level = level;
1532 v->VisualCaveat = visualCaveat;
1533
1534 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1535
1536 {
1537 int xclass;
1538 xclass = GET_VISUAL_CLASS(v);
1539 if (xclass==TrueColor || xclass==DirectColor) {
1540 red_bits = bitcount(GET_REDMASK(v));
1541 green_bits = bitcount(GET_GREENMASK(v));
1542 blue_bits = bitcount(GET_BLUEMASK(v));
1543 alpha_bits = 0;
1544 }
1545 else {
1546 /* this is an approximation */
1547 int depth;
1548 depth = GET_VISUAL_DEPTH(v);
1549 red_bits = depth / 3;
1550 depth -= red_bits;
1551 green_bits = depth / 2;
1552 depth -= green_bits;
1553 blue_bits = depth;
1554 alpha_bits = 0;
1555 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1556 }
1557 }
1558
1559 if (alpha_flag && alpha_bits == 0)
1560 alpha_bits = 8;
1561
1562 _mesa_initialize_visual( &v->mesa_visual,
1563 rgb_flag, db_flag, stereo_flag,
1564 red_bits, green_bits,
1565 blue_bits, alpha_bits,
1566 v->index_bits,
1567 depth_size,
1568 stencil_size,
1569 accum_red_size, accum_green_size,
1570 accum_blue_size, accum_alpha_size,
1571 0 );
1572 return v;
1573 }
1574
1575
1576 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1577 {
1578 v->display = dpy;
1579 }
1580
1581
1582 void XMesaDestroyVisual( XMesaVisual v )
1583 {
1584 #ifndef XFree86Server
1585 FREE(v->visinfo);
1586 #endif
1587 FREE(v);
1588 }
1589
1590
1591
1592 /*
1593 * Create a new XMesaContext.
1594 * Input: v - XMesaVisual
1595 * share_list - another XMesaContext with which to share display
1596 * lists or NULL if no sharing is wanted.
1597 * Return: an XMesaContext or NULL if error.
1598 */
1599 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1600 {
1601 static GLboolean firstTime = GL_TRUE;
1602 XMesaContext c;
1603 GLcontext *ctx;
1604 GLboolean direct = GL_TRUE; /* not really */
1605
1606 if (firstTime) {
1607 _glthread_INIT_MUTEX(_xmesa_lock);
1608 firstTime = GL_FALSE;
1609 }
1610
1611 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1612 if (!c) {
1613 return NULL;
1614 }
1615
1616 ctx = c->gl_ctx = _mesa_create_context( &v->mesa_visual,
1617 share_list ? share_list->gl_ctx : (GLcontext *) NULL,
1618 (void *) c, direct);
1619 if (!c->gl_ctx) {
1620 FREE(c);
1621 return NULL;
1622 }
1623
1624 _mesa_enable_sw_extensions(ctx);
1625 _mesa_enable_1_3_extensions(ctx);
1626 _mesa_enable_1_4_extensions(ctx);
1627
1628 if (CHECK_BYTE_ORDER(v)) {
1629 c->swapbytes = GL_FALSE;
1630 }
1631 else {
1632 c->swapbytes = GL_TRUE;
1633 }
1634
1635 c->xm_visual = v;
1636 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1637 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1638 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1639 c->display = v->display;
1640 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1641
1642 ctx->Driver.UpdateState = xmesa_update_state;
1643
1644 /* Initialize the software rasterizer and helper modules.
1645 */
1646 _swrast_CreateContext( ctx );
1647 _ac_CreateContext( ctx );
1648 _tnl_CreateContext( ctx );
1649 _swsetup_CreateContext( ctx );
1650
1651 xmesa_register_swrast_functions( ctx );
1652
1653 /* Set up some constant pointers:
1654 */
1655 xmesa_init_pointers( ctx );
1656
1657 return c;
1658 }
1659
1660
1661
1662
1663 void XMesaDestroyContext( XMesaContext c )
1664 {
1665 #ifdef FX
1666 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1667 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1668 #endif
1669 if (c->gl_ctx) {
1670 _swsetup_DestroyContext( c->gl_ctx );
1671 _swrast_DestroyContext( c->gl_ctx );
1672 _tnl_DestroyContext( c->gl_ctx );
1673 _ac_DestroyContext( c->gl_ctx );
1674 _mesa_destroy_context( c->gl_ctx );
1675 }
1676
1677 FREE( c );
1678 }
1679
1680
1681
1682 /*
1683 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1684 * Create a new XMesaBuffer from an X window.
1685 * Input: v - the XMesaVisual
1686 * w - the window
1687 * c - the context
1688 * Return: new XMesaBuffer or NULL if error
1689 */
1690 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1691 XMesaContext c )
1692 {
1693 #ifndef XFree86Server
1694 XWindowAttributes attr;
1695 #endif
1696 #ifdef FX
1697 char *fxEnvVar;
1698 #endif
1699 int client = 0;
1700
1701 XMesaBuffer b = alloc_xmesa_buffer();
1702 if (!b) {
1703 return NULL;
1704 }
1705
1706 (void) c;
1707
1708 #ifdef XFree86Server
1709 client = CLIENT_ID(((XMesaDrawable)w)->id);
1710 #endif
1711
1712 assert(v);
1713
1714 #ifdef XFree86Server
1715 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1716 #else
1717 XGetWindowAttributes( v->display, w, &attr );
1718
1719 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1720 #endif
1721 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1722 return NULL;
1723 }
1724
1725 b->xm_visual = v;
1726 b->type = WINDOW;
1727 b->display = v->display;
1728 #ifdef XFree86Server
1729 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1730 #else
1731 if (attr.colormap) {
1732 b->cmap = attr.colormap;
1733 }
1734 else {
1735 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1736 /* this is weird, a window w/out a colormap!? */
1737 /* OK, let's just allocate a new one and hope for the best */
1738 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1739 }
1740 #endif
1741
1742 /* determine back buffer implementation */
1743 if (v->mesa_visual.doubleBufferMode) {
1744 if (v->ximage_flag) {
1745 b->db_state = BACK_XIMAGE;
1746 }
1747 else {
1748 b->db_state = BACK_PIXMAP;
1749 }
1750 }
1751 else {
1752 b->db_state = 0;
1753 }
1754
1755 _mesa_initialize_framebuffer(&b->mesa_buffer,
1756 &v->mesa_visual,
1757 v->mesa_visual.depthBits > 0,
1758 v->mesa_visual.stencilBits > 0,
1759 v->mesa_visual.accumRedBits > 0,
1760 v->mesa_visual.alphaBits > 0 );
1761
1762 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1763 (XMesaDrawable)w, b->cmap )) {
1764 free_xmesa_buffer(client, b);
1765 return NULL;
1766 }
1767
1768 #ifdef FX
1769 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1770 if (fxEnvVar) {
1771 if (fxEnvVar[0]!='d') {
1772 int attribs[100];
1773 int numAttribs = 0;
1774 int hw;
1775 if (v->mesa_visual.depthBits > 0) {
1776 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1777 attribs[numAttribs++] = 1;
1778 }
1779 if (v->mesa_visual.doubleBufferMode) {
1780 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1781 }
1782 if (v->mesa_visual.accumRedBits > 0) {
1783 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1784 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1785 }
1786 if (v->mesa_visual.stencilBits > 0) {
1787 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1788 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1789 }
1790 if (v->mesa_visual.alphaBits > 0) {
1791 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1792 attribs[numAttribs++] = 1;
1793 }
1794 if (c->gl_ctx) {
1795 #define FXMESA_SHARE_CONTEXT 990099 /* keep in sync with fxapi.c! */
1796 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1797 attribs[numAttribs++] = (int) c->gl_ctx;
1798 }
1799 attribs[numAttribs++] = FXMESA_NONE;
1800
1801 if ((hw = fxQueryHardware())==GR_SSTTYPE_VOODOO) {
1802 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1803 if ((v->undithered_pf!=PF_INDEX) && (b->backimage)) {
1804 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1805 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1806 b->FXwindowHack = b->FXctx ? GL_TRUE : GL_FALSE;
1807 else
1808 b->FXwindowHack = GL_FALSE;
1809 }
1810 }
1811 else {
1812 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1813 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1814 GR_REFRESH_75Hz, attribs);
1815 else
1816 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1817 b->FXisHackUsable = GL_FALSE;
1818 b->FXwindowHack = GL_FALSE;
1819 }
1820 /*
1821 fprintf(stderr,
1822 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1823 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1824 */
1825 }
1826 }
1827 else {
1828 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1829 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1830 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1831 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1832 }
1833 #endif
1834
1835 return b;
1836 }
1837
1838
1839 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1840 {
1841 return XMesaCreateWindowBuffer2( v, w, NULL );
1842 }
1843
1844
1845 /*
1846 * Create a new XMesaBuffer from an X pixmap.
1847 * Input: v - the XMesaVisual
1848 * p - the pixmap
1849 * cmap - the colormap, may be 0 if using a TrueColor or DirectColor
1850 * visual for the pixmap
1851 * Return: new XMesaBuffer or NULL if error
1852 */
1853 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1854 XMesaPixmap p, XMesaColormap cmap )
1855 {
1856 int client = 0;
1857 XMesaBuffer b = alloc_xmesa_buffer();
1858 if (!b) {
1859 return NULL;
1860 }
1861
1862
1863 #ifdef XFree86Server
1864 client = CLIENT_ID(((XMesaDrawable)p)->id);
1865 #endif
1866
1867 assert(v);
1868
1869 b->xm_visual = v;
1870 b->type = PIXMAP;
1871 b->display = v->display;
1872 b->cmap = cmap;
1873
1874 /* determine back buffer implementation */
1875 if (v->mesa_visual.doubleBufferMode) {
1876 if (v->ximage_flag) {
1877 b->db_state = BACK_XIMAGE;
1878 }
1879 else {
1880 b->db_state = BACK_PIXMAP;
1881 }
1882 }
1883 else {
1884 b->db_state = 0;
1885 }
1886
1887 _mesa_initialize_framebuffer(&b->mesa_buffer,
1888 &v->mesa_visual,
1889 v->mesa_visual.depthBits > 0,
1890 v->mesa_visual.stencilBits > 0,
1891 v->mesa_visual.accumRedBits +
1892 v->mesa_visual.accumGreenBits +
1893 v->mesa_visual.accumBlueBits > 0,
1894 v->mesa_visual.alphaBits > 0 );
1895
1896 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1897 (XMesaDrawable)p, cmap)) {
1898 free_xmesa_buffer(client, b);
1899 return NULL;
1900 }
1901
1902 return b;
1903 }
1904
1905
1906
1907 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1908 unsigned int width, unsigned int height )
1909 {
1910 #ifdef XFree86Server
1911 return 0;
1912 #else
1913 int client = 0;
1914 XMesaWindow root;
1915 XMesaDrawable drawable; /* X Pixmap Drawable */
1916 XMesaBuffer b = alloc_xmesa_buffer();
1917 if (!b) {
1918 return NULL;
1919 }
1920
1921 b->xm_visual = v;
1922 b->type = PBUFFER;
1923 b->display = v->display;
1924 b->cmap = cmap;
1925
1926 /* allocate pixmap for front buffer */
1927 root = RootWindow( v->display, v->visinfo->screen );
1928 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1929
1930 /* determine back buffer implementation */
1931 if (v->mesa_visual.doubleBufferMode) {
1932 if (v->ximage_flag) {
1933 b->db_state = BACK_XIMAGE;
1934 }
1935 else {
1936 b->db_state = BACK_PIXMAP;
1937 }
1938 }
1939 else {
1940 b->db_state = 0;
1941 }
1942
1943 _mesa_initialize_framebuffer(&b->mesa_buffer,
1944 &v->mesa_visual,
1945 v->mesa_visual.depthBits > 0,
1946 v->mesa_visual.stencilBits > 0,
1947 v->mesa_visual.accumRedBits +
1948 v->mesa_visual.accumGreenBits +
1949 v->mesa_visual.accumBlueBits > 0,
1950 v->mesa_visual.alphaBits > 0 );
1951
1952 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1953 drawable, cmap)) {
1954 free_xmesa_buffer(client, b);
1955 return NULL;
1956 }
1957
1958 return b;
1959 #endif
1960 }
1961
1962
1963
1964 /*
1965 * Deallocate an XMesaBuffer structure and all related info.
1966 */
1967 void XMesaDestroyBuffer( XMesaBuffer b )
1968 {
1969 int client = 0;
1970
1971 #ifdef XFree86Server
1972 if (b->frontbuffer)
1973 client = CLIENT_ID(b->frontbuffer->id);
1974 #endif
1975
1976 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1977 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1978 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
1979
1980 if (b->backimage) {
1981 #if defined(USE_XSHM) && !defined(XFree86Server)
1982 if (b->shm) {
1983 XShmDetach( b->xm_visual->display, &b->shminfo );
1984 XDestroyImage( b->backimage );
1985 shmdt( b->shminfo.shmaddr );
1986 }
1987 else
1988 #endif
1989 XMesaDestroyImage( b->backimage );
1990 }
1991 if (b->backpixmap) {
1992 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
1993 if (b->xm_visual->hpcr_clear_flag) {
1994 XMesaFreePixmap( b->xm_visual->display,
1995 b->xm_visual->hpcr_clear_pixmap );
1996 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
1997 }
1998 }
1999 if (b->rowimage) {
2000 FREE( b->rowimage->data );
2001 b->rowimage->data = NULL;
2002 XMesaDestroyImage( b->rowimage );
2003 }
2004
2005 free_xmesa_buffer(client, b);
2006 }
2007
2008
2009
2010 /*
2011 * Bind buffer b to context c and make c the current rendering context.
2012 */
2013 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2014 {
2015 return XMesaMakeCurrent2( c, b, b );
2016 }
2017
2018
2019 /*
2020 * Bind buffer b to context c and make c the current rendering context.
2021 */
2022 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2023 XMesaBuffer readBuffer )
2024 {
2025 if (c) {
2026 if (!drawBuffer || !readBuffer)
2027 return GL_FALSE; /* must specify buffers! */
2028
2029 #ifdef FX
2030 if (drawBuffer->FXctx) {
2031 fxMesaMakeCurrent(drawBuffer->FXctx);
2032
2033 c->xm_draw_buffer = drawBuffer;
2034 c->xm_read_buffer = readBuffer;
2035 c->xm_buffer = drawBuffer;
2036
2037 return GL_TRUE;
2038 }
2039 #endif
2040 if (c->gl_ctx == _mesa_get_current_context()
2041 && c->xm_draw_buffer == drawBuffer
2042 && c->xm_read_buffer == readBuffer
2043 && c->xm_draw_buffer->wasCurrent) {
2044 /* same context and buffer, do nothing */
2045 return GL_TRUE;
2046 }
2047
2048 c->xm_draw_buffer = drawBuffer;
2049 c->xm_read_buffer = readBuffer;
2050 c->xm_buffer = drawBuffer;
2051
2052 _mesa_make_current2(c->gl_ctx,
2053 &drawBuffer->mesa_buffer,
2054 &readBuffer->mesa_buffer);
2055
2056 if (c->gl_ctx->Viewport.Width == 0) {
2057 /* initialize viewport to window size */
2058 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2059 c->gl_ctx->Scissor.Width = drawBuffer->width;
2060 c->gl_ctx->Scissor.Height = drawBuffer->height;
2061 }
2062
2063 if (c->xm_visual->mesa_visual.rgbMode) {
2064 /*
2065 * Must recompute and set these pixel values because colormap
2066 * can be different for different windows.
2067 */
2068 c->clearpixel = xmesa_color_to_pixel( c,
2069 c->clearcolor[0],
2070 c->clearcolor[1],
2071 c->clearcolor[2],
2072 c->clearcolor[3],
2073 c->xm_visual->undithered_pf);
2074 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2075 }
2076
2077 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2078 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2079 }
2080 else {
2081 /* Detach */
2082 _mesa_make_current2( NULL, NULL, NULL );
2083 }
2084 return GL_TRUE;
2085 }
2086
2087
2088 /*
2089 * Unbind the context c from its buffer.
2090 */
2091 GLboolean XMesaUnbindContext( XMesaContext c )
2092 {
2093 /* A no-op for XFree86 integration purposes */
2094 return GL_TRUE;
2095 }
2096
2097
2098 XMesaContext XMesaGetCurrentContext( void )
2099 {
2100 GET_CURRENT_CONTEXT(ctx);
2101 if (ctx) {
2102 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2103 return xmesa;
2104 }
2105 else {
2106 return 0;
2107 }
2108 }
2109
2110
2111 XMesaBuffer XMesaGetCurrentBuffer( void )
2112 {
2113 GET_CURRENT_CONTEXT(ctx);
2114 if (ctx) {
2115 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2116 return xmesa->xm_draw_buffer;
2117 }
2118 else {
2119 return 0;
2120 }
2121 }
2122
2123
2124 /* New in Mesa 3.1 */
2125 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2126 {
2127 GET_CURRENT_CONTEXT(ctx);
2128 if (ctx) {
2129 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2130 return xmesa->xm_read_buffer;
2131 }
2132 else {
2133 return 0;
2134 }
2135 }
2136
2137
2138 GLboolean XMesaForceCurrent(XMesaContext c)
2139 {
2140 if (c) {
2141 if (c->gl_ctx != _mesa_get_current_context()) {
2142 _mesa_make_current(c->gl_ctx, &c->xm_draw_buffer->mesa_buffer);
2143 }
2144 }
2145 else {
2146 _mesa_make_current(NULL, NULL);
2147 }
2148 return GL_TRUE;
2149 }
2150
2151
2152 GLboolean XMesaLoseCurrent(XMesaContext c)
2153 {
2154 (void) c;
2155 _mesa_make_current(NULL, NULL);
2156 return GL_TRUE;
2157 }
2158
2159
2160 /*
2161 * Switch 3Dfx support hack between window and full-screen mode.
2162 */
2163 GLboolean XMesaSetFXmode( GLint mode )
2164 {
2165 #ifdef FX
2166 const char *fx = _mesa_getenv("MESA_GLX_FX");
2167 if (fx && fx[0] != 'd') {
2168 GET_CURRENT_CONTEXT(ctx);
2169 GrHwConfiguration hw;
2170 if (!FX_grSstQueryHardware(&hw)) {
2171 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2172 return GL_FALSE;
2173 }
2174 if (hw.num_sst < 1) {
2175 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2176 return GL_FALSE;
2177 }
2178 if (ctx) {
2179 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2180 if (mode == XMESA_FX_WINDOW) {
2181 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2182 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2183 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2184 return GL_TRUE;
2185 }
2186 }
2187 else if (mode == XMESA_FX_FULLSCREEN) {
2188 FX_grSstControl(GR_CONTROL_ACTIVATE);
2189 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2190 return GL_TRUE;
2191 }
2192 else {
2193 /* Error: Bad mode value */
2194 }
2195 }
2196 }
2197 /*fprintf(stderr, "fallthrough\n");*/
2198 #else
2199 (void) mode;
2200 #endif
2201 return GL_FALSE;
2202 }
2203
2204
2205
2206 #ifdef FX
2207 /*
2208 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2209 */
2210 static void FXgetImage( XMesaBuffer b )
2211 {
2212 GET_CURRENT_CONTEXT(ctx);
2213 static unsigned short pixbuf[MAX_WIDTH];
2214 GLuint x, y;
2215 int xpos, ypos;
2216 XMesaWindow root;
2217 unsigned int bw, depth, width, height;
2218 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2219
2220 #ifdef XFree86Server
2221 x = b->frontbuffer->x;
2222 y = b->frontbuffer->y;
2223 width = b->frontbuffer->width;
2224 height = b->frontbuffer->height;
2225 depth = b->frontbuffer->depth;
2226 #else
2227 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2228 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2229 #endif
2230 if (b->width != width || b->height != height) {
2231 b->width = MIN2((int)width, b->FXctx->width);
2232 b->height = MIN2((int)height, b->FXctx->height);
2233 if (b->width & 1)
2234 b->width--; /* prevent odd width */
2235 xmesa_alloc_back_buffer( b );
2236 }
2237
2238 grLfbWriteColorFormat(GR_COLORFORMAT_ARGB);
2239 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2240 /* Special case: 16bpp RGB */
2241 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2242 0, b->FXctx->height - b->height, /*pos*/
2243 b->width, b->height, /* size */
2244 b->width * sizeof(GLushort), /* stride */
2245 b->backimage->data); /* dest buffer */
2246 }
2247 else if (b->xm_visual->dithered_pf==PF_DITHER
2248 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2249 /* Special case: 8bpp RGB */
2250 for (y=0;y<b->height;y++) {
2251 GLubyte *ptr = (GLubyte*) b->backimage->data
2252 + b->backimage->bytes_per_line * y;
2253 XDITHER_SETUP(y);
2254
2255 /* read row from 3Dfx frame buffer */
2256 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2257 0, b->FXctx->height-(b->height-y),
2258 b->width, 1,
2259 0,
2260 pixbuf );
2261
2262 /* write to XImage back buffer */
2263 for (x=0;x<b->width;x++) {
2264 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2265 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2266 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2267 *ptr++ = XDITHER( x, r, g, b);
2268 }
2269 }
2270 }
2271 else {
2272 /* General case: slow! */
2273 for (y=0;y<b->height;y++) {
2274 /* read row from 3Dfx frame buffer */
2275 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2276 0, b->FXctx->height-(b->height-y),
2277 b->width, 1,
2278 0,
2279 pixbuf );
2280
2281 /* write to XImage back buffer */
2282 for (x=0;x<b->width;x++) {
2283 XMesaPutPixel(b->backimage,x,y,
2284 xmesa_color_to_pixel(xmesa,
2285 (pixbuf[x] & 0xf800) >> 8,
2286 (pixbuf[x] & 0x07e0) >> 3,
2287 (pixbuf[x] & 0x001f) << 3,
2288 0xff,
2289 b->xm_visual->undithered_pf));
2290 }
2291 }
2292 }
2293 grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
2294 }
2295 #endif
2296
2297
2298 /*
2299 * Copy the back buffer to the front buffer. If there's no back buffer
2300 * this is a no-op.
2301 */
2302 void XMesaSwapBuffers( XMesaBuffer b )
2303 {
2304 GET_CURRENT_CONTEXT(ctx);
2305
2306 /* If we're swapping the buffer associated with the current context
2307 * we have to flush any pending rendering commands first.
2308 */
2309 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2310 _mesa_notifySwapBuffers(ctx);
2311
2312 if (b->db_state) {
2313 #ifdef FX
2314 if (b->FXctx) {
2315 fxMesaSwapBuffers();
2316
2317 if (b->FXwindowHack)
2318 FXgetImage(b);
2319 else
2320 return;
2321 }
2322 #endif
2323 if (b->backimage) {
2324 /* Copy Ximage from host's memory to server's window */
2325 #if defined(USE_XSHM) && !defined(XFree86Server)
2326 if (b->shm) {
2327 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2328 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2329 b->swapgc,
2330 b->backimage, 0, 0,
2331 0, 0, b->width, b->height, False );
2332 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2333 }
2334 else
2335 #endif
2336 {
2337 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2338 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2339 b->swapgc,
2340 b->backimage, 0, 0,
2341 0, 0, b->width, b->height );
2342 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2343 }
2344 }
2345 else {
2346 /* Copy pixmap to window on server */
2347 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2348 XMesaCopyArea( b->xm_visual->display,
2349 b->backpixmap, /* source drawable */
2350 b->frontbuffer, /* dest. drawable */
2351 b->swapgc,
2352 0, 0, b->width, b->height, /* source region */
2353 0, 0 /* dest region */
2354 );
2355 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2356 }
2357 }
2358 #if !defined(XFree86Server)
2359 XSync( b->xm_visual->display, False );
2360 #endif
2361 }
2362
2363
2364
2365 /*
2366 * Copy sub-region of back buffer to front buffer
2367 */
2368 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2369 {
2370 GET_CURRENT_CONTEXT(ctx);
2371
2372 /* If we're swapping the buffer associated with the current context
2373 * we have to flush any pending rendering commands first.
2374 */
2375 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2376 _mesa_notifySwapBuffers(ctx);
2377
2378 if (b->db_state) {
2379 int yTop = b->height - y - height;
2380 #ifdef FX
2381 if (b->FXctx) {
2382 fxMesaSwapBuffers();
2383 if (b->FXwindowHack)
2384 FXgetImage(b);
2385 else
2386 return;
2387 }
2388 #endif
2389 if (b->backimage) {
2390 /* Copy Ximage from host's memory to server's window */
2391 #if defined(USE_XSHM) && !defined(XFree86Server)
2392 if (b->shm) {
2393 /* XXX assuming width and height aren't too large! */
2394 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2395 b->swapgc,
2396 b->backimage, x, yTop,
2397 x, yTop, width, height, False );
2398 /* wait for finished event??? */
2399 }
2400 else
2401 #endif
2402 {
2403 /* XXX assuming width and height aren't too large! */
2404 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2405 b->swapgc,
2406 b->backimage, x, yTop,
2407 x, yTop, width, height );
2408 }
2409 }
2410 else {
2411 /* Copy pixmap to window on server */
2412 XMesaCopyArea( b->xm_visual->display,
2413 b->backpixmap, /* source drawable */
2414 b->frontbuffer, /* dest. drawable */
2415 b->swapgc,
2416 x, yTop, width, height, /* source region */
2417 x, yTop /* dest region */
2418 );
2419 }
2420 }
2421 }
2422
2423
2424 /*
2425 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2426 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2427 * back buffer directly.
2428 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2429 * ximage - pointer to back buffer's XImage, or NULL
2430 * Return: GL_TRUE = context is double buffered
2431 * GL_FALSE = context is single buffered
2432 */
2433 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2434 XMesaPixmap *pixmap,
2435 XMesaImage **ximage )
2436 {
2437 if (b->db_state) {
2438 if (pixmap) *pixmap = b->backpixmap;
2439 if (ximage) *ximage = b->backimage;
2440 return GL_TRUE;
2441 }
2442 else {
2443 *pixmap = 0;
2444 *ximage = NULL;
2445 return GL_FALSE;
2446 }
2447 }
2448
2449
2450 /*
2451 * Return the depth buffer associated with an XMesaBuffer.
2452 * Input: b - the XMesa buffer handle
2453 * Output: width, height - size of buffer in pixels
2454 * bytesPerValue - bytes per depth value (2 or 4)
2455 * buffer - pointer to depth buffer values
2456 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2457 */
2458 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2459 GLint *bytesPerValue, void **buffer )
2460 {
2461 if (!b->mesa_buffer.DepthBuffer) {
2462 *width = 0;
2463 *height = 0;
2464 *bytesPerValue = 0;
2465 *buffer = 0;
2466 return GL_FALSE;
2467 }
2468 else {
2469 *width = b->mesa_buffer.Width;
2470 *height = b->mesa_buffer.Height;
2471 *bytesPerValue = sizeof(GLdepth);
2472 *buffer = b->mesa_buffer.DepthBuffer;
2473 return GL_TRUE;
2474 }
2475 }
2476
2477
2478 void XMesaFlush( XMesaContext c )
2479 {
2480 if (c && c->xm_visual) {
2481 #ifdef XFree86Server
2482 /* NOT_NEEDED */
2483 #else
2484 XSync( c->xm_visual->display, False );
2485 #endif
2486 }
2487 }
2488
2489
2490
2491 const char *XMesaGetString( XMesaContext c, int name )
2492 {
2493 (void) c;
2494 if (name==XMESA_VERSION) {
2495 return "5.0";
2496 }
2497 else if (name==XMESA_EXTENSIONS) {
2498 return "";
2499 }
2500 else {
2501 return NULL;
2502 }
2503 }
2504
2505
2506
2507 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2508 {
2509 XMesaBuffer b;
2510 for (b=XMesaBufferList; b; b=b->Next) {
2511 if (b->frontbuffer==d && b->display==dpy) {
2512 return b;
2513 }
2514 }
2515 return NULL;
2516 }
2517
2518
2519
2520 /*
2521 * Look for XMesaBuffers whose X window has been destroyed.
2522 * Deallocate any such XMesaBuffers.
2523 */
2524 void XMesaGarbageCollect( void )
2525 {
2526 XMesaBuffer b, next;
2527 for (b=XMesaBufferList; b; b=next) {
2528 next = b->Next;
2529 if (b->display && b->frontbuffer && b->type == WINDOW) {
2530 #ifdef XFree86Server
2531 /* NOT_NEEDED */
2532 #else
2533 XSync(b->display, False);
2534 if (!window_exists( b->display, b->frontbuffer )) {
2535 /* found a dead window, free the ancillary info */
2536 XMesaDestroyBuffer( b );
2537 }
2538 #endif
2539 }
2540 }
2541 }
2542
2543
2544 void XMesaReset( void )
2545 {
2546 while (XMesaBufferList)
2547 XMesaDestroyBuffer(XMesaBufferList);
2548
2549 XMesaBufferList = NULL;
2550 }
2551
2552
2553 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2554 GLfloat red, GLfloat green,
2555 GLfloat blue, GLfloat alpha )
2556 {
2557 GLint r = (GLint) (red * 255.0F);
2558 GLint g = (GLint) (green * 255.0F);
2559 GLint b = (GLint) (blue * 255.0F);
2560 GLint a = (GLint) (alpha * 255.0F);
2561
2562 switch (xmesa->pixelformat) {
2563 case PF_INDEX:
2564 return 0;
2565 case PF_TRUECOLOR:
2566 {
2567 unsigned long p;
2568 PACK_TRUECOLOR( p, r, g, b );
2569 return p;
2570 }
2571 case PF_8A8B8G8R:
2572 return PACK_8A8B8G8R( r, g, b, a );
2573 case PF_8R8G8B:
2574 return PACK_8R8G8B( r, g, b );
2575 case PF_5R6G5B:
2576 return PACK_5R6G5B( r, g, b );
2577 case PF_DITHER:
2578 {
2579 DITHER_SETUP;
2580 return DITHER( x, y, r, g, b );
2581 }
2582 case PF_1BIT:
2583 /* 382 = (3*255)/2 */
2584 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2585 case PF_HPCR:
2586 return DITHER_HPCR(x, y, r, g, b);
2587 case PF_LOOKUP:
2588 {
2589 LOOKUP_SETUP;
2590 return LOOKUP( r, g, b );
2591 }
2592 case PF_GRAYSCALE:
2593 return GRAY_RGB( r, g, b );
2594 case PF_DITHER_5R6G5B:
2595 /* fall through */
2596 case PF_TRUEDITHER:
2597 {
2598 unsigned long p;
2599 PACK_TRUEDITHER(p, x, y, r, g, b);
2600 return p;
2601 }
2602 default:
2603 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2604 }
2605 return 0;
2606 }
2607
2608
2609 /*
2610 * This is typically called when the window size changes and we need
2611 * to reallocate the buffer's back/depth/stencil/accum buffers.
2612 */
2613 void XMesaResizeBuffers( XMesaBuffer b )
2614 {
2615 xmesa_resize_buffers( &(b->mesa_buffer) );
2616
2617 }
2618