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[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /* $Id: xm_api.c,v 1.52 2003/01/24 15:33:22 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 5.0.1
6 *
7 * Copyright (C) 1999-2003 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 < DITH_R; r++) {
912 for (g = 0; g < DITH_G; g++) {
913 for (b = 0; b < DITH_B; b++) {
914 XMesaColor xcol;
915 int exact, alloced;
916 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
917 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
918 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_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 = DITH_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 / (DITH_R-1);
935 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
936 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_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, DITH_R * DITH_G * DITH_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 #endif
1498
1499 #ifdef XFree86Server
1500 /* Initialize the depth of the screen */
1501 {
1502 PixmapFormatRec *format;
1503
1504 for (format = screenInfo.formats;
1505 format->depth != display->rootDepth;
1506 format++)
1507 ;
1508 v->screen_depth = format->bitsPerPixel;
1509 }
1510 #endif
1511
1512 /* check for MESA_GAMMA environment variable */
1513 gamma = _mesa_getenv("MESA_GAMMA");
1514 if (gamma) {
1515 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1516 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1517 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1518 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1519 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1520 }
1521 else {
1522 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1523 }
1524
1525 v->ximage_flag = ximage_flag;
1526 v->level = level;
1527 v->VisualCaveat = visualCaveat;
1528
1529 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1530
1531 {
1532 int xclass;
1533 xclass = GET_VISUAL_CLASS(v);
1534 if (xclass==TrueColor || xclass==DirectColor) {
1535 red_bits = bitcount(GET_REDMASK(v));
1536 green_bits = bitcount(GET_GREENMASK(v));
1537 blue_bits = bitcount(GET_BLUEMASK(v));
1538 alpha_bits = 0;
1539 }
1540 else {
1541 /* this is an approximation */
1542 int depth;
1543 depth = GET_VISUAL_DEPTH(v);
1544 red_bits = depth / 3;
1545 depth -= red_bits;
1546 green_bits = depth / 2;
1547 depth -= green_bits;
1548 blue_bits = depth;
1549 alpha_bits = 0;
1550 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1551 }
1552 }
1553
1554 if (alpha_flag && alpha_bits == 0)
1555 alpha_bits = 8;
1556
1557 _mesa_initialize_visual( &v->mesa_visual,
1558 rgb_flag, db_flag, stereo_flag,
1559 red_bits, green_bits,
1560 blue_bits, alpha_bits,
1561 v->index_bits,
1562 depth_size,
1563 stencil_size,
1564 accum_red_size, accum_green_size,
1565 accum_blue_size, accum_alpha_size,
1566 0 );
1567 return v;
1568 }
1569
1570
1571 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1572 {
1573 v->display = dpy;
1574 }
1575
1576
1577 void XMesaDestroyVisual( XMesaVisual v )
1578 {
1579 #ifndef XFree86Server
1580 FREE(v->visinfo);
1581 #endif
1582 FREE(v);
1583 }
1584
1585
1586
1587 /*
1588 * Create a new XMesaContext.
1589 * Input: v - XMesaVisual
1590 * share_list - another XMesaContext with which to share display
1591 * lists or NULL if no sharing is wanted.
1592 * Return: an XMesaContext or NULL if error.
1593 */
1594 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1595 {
1596 static GLboolean firstTime = GL_TRUE;
1597 XMesaContext c;
1598 GLcontext *ctx;
1599 GLboolean direct = GL_TRUE; /* not really */
1600
1601 if (firstTime) {
1602 _glthread_INIT_MUTEX(_xmesa_lock);
1603 firstTime = GL_FALSE;
1604 }
1605
1606 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1607 if (!c) {
1608 return NULL;
1609 }
1610
1611 ctx = c->gl_ctx = _mesa_create_context( &v->mesa_visual,
1612 share_list ? share_list->gl_ctx : (GLcontext *) NULL,
1613 (void *) c, direct);
1614 if (!c->gl_ctx) {
1615 FREE(c);
1616 return NULL;
1617 }
1618
1619 _mesa_enable_sw_extensions(ctx);
1620 _mesa_enable_1_3_extensions(ctx);
1621 _mesa_enable_1_4_extensions(ctx);
1622
1623 if (CHECK_BYTE_ORDER(v)) {
1624 c->swapbytes = GL_FALSE;
1625 }
1626 else {
1627 c->swapbytes = GL_TRUE;
1628 }
1629
1630 c->xm_visual = v;
1631 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1632 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1633 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1634 c->display = v->display;
1635 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1636
1637 ctx->Driver.UpdateState = xmesa_update_state;
1638
1639 /* Initialize the software rasterizer and helper modules.
1640 */
1641 _swrast_CreateContext( ctx );
1642 _ac_CreateContext( ctx );
1643 _tnl_CreateContext( ctx );
1644 _swsetup_CreateContext( ctx );
1645
1646 xmesa_register_swrast_functions( ctx );
1647
1648 /* Set up some constant pointers:
1649 */
1650 xmesa_init_pointers( ctx );
1651
1652 return c;
1653 }
1654
1655
1656
1657
1658 void XMesaDestroyContext( XMesaContext c )
1659 {
1660 #ifdef FX
1661 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1662 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1663 #endif
1664 if (c->gl_ctx) {
1665 _swsetup_DestroyContext( c->gl_ctx );
1666 _swrast_DestroyContext( c->gl_ctx );
1667 _tnl_DestroyContext( c->gl_ctx );
1668 _ac_DestroyContext( c->gl_ctx );
1669 _mesa_destroy_context( c->gl_ctx );
1670 }
1671
1672 FREE( c );
1673 }
1674
1675
1676
1677 /*
1678 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1679 * Create a new XMesaBuffer from an X window.
1680 * Input: v - the XMesaVisual
1681 * w - the window
1682 * c - the context
1683 * Return: new XMesaBuffer or NULL if error
1684 */
1685 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1686 XMesaContext c )
1687 {
1688 #ifndef XFree86Server
1689 XWindowAttributes attr;
1690 #endif
1691 #ifdef FX
1692 char *fxEnvVar;
1693 #endif
1694 int client = 0;
1695
1696 XMesaBuffer b = alloc_xmesa_buffer();
1697 if (!b) {
1698 return NULL;
1699 }
1700
1701 (void) c;
1702
1703 #ifdef XFree86Server
1704 client = CLIENT_ID(((XMesaDrawable)w)->id);
1705 #endif
1706
1707 assert(v);
1708
1709 #ifdef XFree86Server
1710 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1711 #else
1712 XGetWindowAttributes( v->display, w, &attr );
1713
1714 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1715 #endif
1716 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1717 return NULL;
1718 }
1719
1720 b->xm_visual = v;
1721 b->type = WINDOW;
1722 b->display = v->display;
1723 #ifdef XFree86Server
1724 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1725 #else
1726 if (attr.colormap) {
1727 b->cmap = attr.colormap;
1728 }
1729 else {
1730 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1731 /* this is weird, a window w/out a colormap!? */
1732 /* OK, let's just allocate a new one and hope for the best */
1733 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1734 }
1735 #endif
1736
1737 /* determine back buffer implementation */
1738 if (v->mesa_visual.doubleBufferMode) {
1739 if (v->ximage_flag) {
1740 b->db_state = BACK_XIMAGE;
1741 }
1742 else {
1743 b->db_state = BACK_PIXMAP;
1744 }
1745 }
1746 else {
1747 b->db_state = 0;
1748 }
1749
1750 _mesa_initialize_framebuffer(&b->mesa_buffer,
1751 &v->mesa_visual,
1752 v->mesa_visual.depthBits > 0,
1753 v->mesa_visual.stencilBits > 0,
1754 v->mesa_visual.accumRedBits > 0,
1755 v->mesa_visual.alphaBits > 0 );
1756
1757 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1758 (XMesaDrawable)w, b->cmap )) {
1759 free_xmesa_buffer(client, b);
1760 return NULL;
1761 }
1762
1763 #ifdef FX
1764 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1765 if (fxEnvVar) {
1766 if (fxEnvVar[0]!='d') {
1767 int attribs[100];
1768 int numAttribs = 0;
1769 int hw;
1770 if (v->mesa_visual.depthBits > 0) {
1771 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1772 attribs[numAttribs++] = 1;
1773 }
1774 if (v->mesa_visual.doubleBufferMode) {
1775 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1776 }
1777 if (v->mesa_visual.accumRedBits > 0) {
1778 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1779 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1780 }
1781 if (v->mesa_visual.stencilBits > 0) {
1782 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1783 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1784 }
1785 if (v->mesa_visual.alphaBits > 0) {
1786 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1787 attribs[numAttribs++] = 1;
1788 }
1789 if (c->gl_ctx) {
1790 #define FXMESA_SHARE_CONTEXT 990099 /* keep in sync with fxapi.c! */
1791 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1792 attribs[numAttribs++] = (int) c->gl_ctx;
1793 }
1794 attribs[numAttribs++] = FXMESA_NONE;
1795
1796 if ((hw = fxQueryHardware())==GR_SSTTYPE_VOODOO) {
1797 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1798 if ((v->undithered_pf!=PF_INDEX) && (b->backimage)) {
1799 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1800 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1801 b->FXwindowHack = b->FXctx ? GL_TRUE : GL_FALSE;
1802 else
1803 b->FXwindowHack = GL_FALSE;
1804 }
1805 }
1806 else {
1807 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1808 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1809 GR_REFRESH_75Hz, attribs);
1810 else
1811 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1812 b->FXisHackUsable = GL_FALSE;
1813 b->FXwindowHack = GL_FALSE;
1814 }
1815 /*
1816 fprintf(stderr,
1817 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1818 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1819 */
1820 }
1821 }
1822 else {
1823 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1824 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1825 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1826 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1827 }
1828 #endif
1829
1830 return b;
1831 }
1832
1833
1834 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1835 {
1836 return XMesaCreateWindowBuffer2( v, w, NULL );
1837 }
1838
1839
1840 /*
1841 * Create a new XMesaBuffer from an X pixmap.
1842 * Input: v - the XMesaVisual
1843 * p - the pixmap
1844 * cmap - the colormap, may be 0 if using a TrueColor or DirectColor
1845 * visual for the pixmap
1846 * Return: new XMesaBuffer or NULL if error
1847 */
1848 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1849 XMesaPixmap p, XMesaColormap cmap )
1850 {
1851 int client = 0;
1852 XMesaBuffer b = alloc_xmesa_buffer();
1853 if (!b) {
1854 return NULL;
1855 }
1856
1857
1858 #ifdef XFree86Server
1859 client = CLIENT_ID(((XMesaDrawable)p)->id);
1860 #endif
1861
1862 assert(v);
1863
1864 b->xm_visual = v;
1865 b->type = PIXMAP;
1866 b->display = v->display;
1867 b->cmap = cmap;
1868
1869 /* determine back buffer implementation */
1870 if (v->mesa_visual.doubleBufferMode) {
1871 if (v->ximage_flag) {
1872 b->db_state = BACK_XIMAGE;
1873 }
1874 else {
1875 b->db_state = BACK_PIXMAP;
1876 }
1877 }
1878 else {
1879 b->db_state = 0;
1880 }
1881
1882 _mesa_initialize_framebuffer(&b->mesa_buffer,
1883 &v->mesa_visual,
1884 v->mesa_visual.depthBits > 0,
1885 v->mesa_visual.stencilBits > 0,
1886 v->mesa_visual.accumRedBits +
1887 v->mesa_visual.accumGreenBits +
1888 v->mesa_visual.accumBlueBits > 0,
1889 v->mesa_visual.alphaBits > 0 );
1890
1891 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1892 (XMesaDrawable)p, cmap)) {
1893 free_xmesa_buffer(client, b);
1894 return NULL;
1895 }
1896
1897 return b;
1898 }
1899
1900
1901
1902 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1903 unsigned int width, unsigned int height )
1904 {
1905 #ifdef XFree86Server
1906 return 0;
1907 #else
1908 int client = 0;
1909 XMesaWindow root;
1910 XMesaDrawable drawable; /* X Pixmap Drawable */
1911 XMesaBuffer b = alloc_xmesa_buffer();
1912 if (!b) {
1913 return NULL;
1914 }
1915
1916 b->xm_visual = v;
1917 b->type = PBUFFER;
1918 b->display = v->display;
1919 b->cmap = cmap;
1920
1921 /* allocate pixmap for front buffer */
1922 root = RootWindow( v->display, v->visinfo->screen );
1923 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1924
1925 /* determine back buffer implementation */
1926 if (v->mesa_visual.doubleBufferMode) {
1927 if (v->ximage_flag) {
1928 b->db_state = BACK_XIMAGE;
1929 }
1930 else {
1931 b->db_state = BACK_PIXMAP;
1932 }
1933 }
1934 else {
1935 b->db_state = 0;
1936 }
1937
1938 _mesa_initialize_framebuffer(&b->mesa_buffer,
1939 &v->mesa_visual,
1940 v->mesa_visual.depthBits > 0,
1941 v->mesa_visual.stencilBits > 0,
1942 v->mesa_visual.accumRedBits +
1943 v->mesa_visual.accumGreenBits +
1944 v->mesa_visual.accumBlueBits > 0,
1945 v->mesa_visual.alphaBits > 0 );
1946
1947 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1948 drawable, cmap)) {
1949 free_xmesa_buffer(client, b);
1950 return NULL;
1951 }
1952
1953 return b;
1954 #endif
1955 }
1956
1957
1958
1959 /*
1960 * Deallocate an XMesaBuffer structure and all related info.
1961 */
1962 void XMesaDestroyBuffer( XMesaBuffer b )
1963 {
1964 int client = 0;
1965
1966 #ifdef XFree86Server
1967 if (b->frontbuffer)
1968 client = CLIENT_ID(b->frontbuffer->id);
1969 #endif
1970
1971 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1972 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1973 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
1974
1975 if (b->backimage) {
1976 #if defined(USE_XSHM) && !defined(XFree86Server)
1977 if (b->shm) {
1978 XShmDetach( b->xm_visual->display, &b->shminfo );
1979 XDestroyImage( b->backimage );
1980 shmdt( b->shminfo.shmaddr );
1981 }
1982 else
1983 #endif
1984 XMesaDestroyImage( b->backimage );
1985 }
1986 if (b->backpixmap) {
1987 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
1988 if (b->xm_visual->hpcr_clear_flag) {
1989 XMesaFreePixmap( b->xm_visual->display,
1990 b->xm_visual->hpcr_clear_pixmap );
1991 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
1992 }
1993 }
1994 if (b->rowimage) {
1995 FREE( b->rowimage->data );
1996 b->rowimage->data = NULL;
1997 XMesaDestroyImage( b->rowimage );
1998 }
1999
2000 free_xmesa_buffer(client, b);
2001 }
2002
2003
2004
2005 /*
2006 * Bind buffer b to context c and make c the current rendering context.
2007 */
2008 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2009 {
2010 return XMesaMakeCurrent2( c, b, b );
2011 }
2012
2013
2014 /*
2015 * Bind buffer b to context c and make c the current rendering context.
2016 */
2017 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2018 XMesaBuffer readBuffer )
2019 {
2020 if (c) {
2021 if (!drawBuffer || !readBuffer)
2022 return GL_FALSE; /* must specify buffers! */
2023
2024 #ifdef FX
2025 if (drawBuffer->FXctx) {
2026 fxMesaMakeCurrent(drawBuffer->FXctx);
2027
2028 c->xm_draw_buffer = drawBuffer;
2029 c->xm_read_buffer = readBuffer;
2030 c->xm_buffer = drawBuffer;
2031
2032 return GL_TRUE;
2033 }
2034 #endif
2035 if (c->gl_ctx == _mesa_get_current_context()
2036 && c->xm_draw_buffer == drawBuffer
2037 && c->xm_read_buffer == readBuffer
2038 && c->xm_draw_buffer->wasCurrent) {
2039 /* same context and buffer, do nothing */
2040 return GL_TRUE;
2041 }
2042
2043 c->xm_draw_buffer = drawBuffer;
2044 c->xm_read_buffer = readBuffer;
2045 c->xm_buffer = drawBuffer;
2046
2047 _mesa_make_current2(c->gl_ctx,
2048 &drawBuffer->mesa_buffer,
2049 &readBuffer->mesa_buffer);
2050
2051 if (c->gl_ctx->Viewport.Width == 0) {
2052 /* initialize viewport to window size */
2053 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2054 c->gl_ctx->Scissor.Width = drawBuffer->width;
2055 c->gl_ctx->Scissor.Height = drawBuffer->height;
2056 }
2057
2058 if (c->xm_visual->mesa_visual.rgbMode) {
2059 /*
2060 * Must recompute and set these pixel values because colormap
2061 * can be different for different windows.
2062 */
2063 c->clearpixel = xmesa_color_to_pixel( c,
2064 c->clearcolor[0],
2065 c->clearcolor[1],
2066 c->clearcolor[2],
2067 c->clearcolor[3],
2068 c->xm_visual->undithered_pf);
2069 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2070 }
2071
2072 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2073 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2074 }
2075 else {
2076 /* Detach */
2077 _mesa_make_current2( NULL, NULL, NULL );
2078 }
2079 return GL_TRUE;
2080 }
2081
2082
2083 /*
2084 * Unbind the context c from its buffer.
2085 */
2086 GLboolean XMesaUnbindContext( XMesaContext c )
2087 {
2088 /* A no-op for XFree86 integration purposes */
2089 return GL_TRUE;
2090 }
2091
2092
2093 XMesaContext XMesaGetCurrentContext( void )
2094 {
2095 GET_CURRENT_CONTEXT(ctx);
2096 if (ctx) {
2097 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2098 return xmesa;
2099 }
2100 else {
2101 return 0;
2102 }
2103 }
2104
2105
2106 XMesaBuffer XMesaGetCurrentBuffer( void )
2107 {
2108 GET_CURRENT_CONTEXT(ctx);
2109 if (ctx) {
2110 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2111 return xmesa->xm_draw_buffer;
2112 }
2113 else {
2114 return 0;
2115 }
2116 }
2117
2118
2119 /* New in Mesa 3.1 */
2120 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2121 {
2122 GET_CURRENT_CONTEXT(ctx);
2123 if (ctx) {
2124 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2125 return xmesa->xm_read_buffer;
2126 }
2127 else {
2128 return 0;
2129 }
2130 }
2131
2132
2133 GLboolean XMesaForceCurrent(XMesaContext c)
2134 {
2135 if (c) {
2136 if (c->gl_ctx != _mesa_get_current_context()) {
2137 _mesa_make_current(c->gl_ctx, &c->xm_draw_buffer->mesa_buffer);
2138 }
2139 }
2140 else {
2141 _mesa_make_current(NULL, NULL);
2142 }
2143 return GL_TRUE;
2144 }
2145
2146
2147 GLboolean XMesaLoseCurrent(XMesaContext c)
2148 {
2149 (void) c;
2150 _mesa_make_current(NULL, NULL);
2151 return GL_TRUE;
2152 }
2153
2154
2155 /*
2156 * Switch 3Dfx support hack between window and full-screen mode.
2157 */
2158 GLboolean XMesaSetFXmode( GLint mode )
2159 {
2160 #ifdef FX
2161 const char *fx = _mesa_getenv("MESA_GLX_FX");
2162 if (fx && fx[0] != 'd') {
2163 GET_CURRENT_CONTEXT(ctx);
2164 GrHwConfiguration hw;
2165 if (!FX_grSstQueryHardware(&hw)) {
2166 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2167 return GL_FALSE;
2168 }
2169 if (hw.num_sst < 1) {
2170 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2171 return GL_FALSE;
2172 }
2173 if (ctx) {
2174 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2175 if (mode == XMESA_FX_WINDOW) {
2176 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2177 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2178 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2179 return GL_TRUE;
2180 }
2181 }
2182 else if (mode == XMESA_FX_FULLSCREEN) {
2183 FX_grSstControl(GR_CONTROL_ACTIVATE);
2184 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2185 return GL_TRUE;
2186 }
2187 else {
2188 /* Error: Bad mode value */
2189 }
2190 }
2191 }
2192 /*fprintf(stderr, "fallthrough\n");*/
2193 #else
2194 (void) mode;
2195 #endif
2196 return GL_FALSE;
2197 }
2198
2199
2200
2201 #ifdef FX
2202 /*
2203 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2204 */
2205 static void FXgetImage( XMesaBuffer b )
2206 {
2207 GET_CURRENT_CONTEXT(ctx);
2208 static unsigned short pixbuf[MAX_WIDTH];
2209 GLuint x, y;
2210 int xpos, ypos;
2211 XMesaWindow root;
2212 unsigned int bw, depth, width, height;
2213 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2214
2215 #ifdef XFree86Server
2216 x = b->frontbuffer->x;
2217 y = b->frontbuffer->y;
2218 width = b->frontbuffer->width;
2219 height = b->frontbuffer->height;
2220 depth = b->frontbuffer->depth;
2221 #else
2222 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2223 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2224 #endif
2225 if (b->width != width || b->height != height) {
2226 b->width = MIN2((int)width, b->FXctx->width);
2227 b->height = MIN2((int)height, b->FXctx->height);
2228 if (b->width & 1)
2229 b->width--; /* prevent odd width */
2230 xmesa_alloc_back_buffer( b );
2231 }
2232
2233 grLfbWriteColorFormat(GR_COLORFORMAT_ARGB);
2234 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2235 /* Special case: 16bpp RGB */
2236 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2237 0, b->FXctx->height - b->height, /*pos*/
2238 b->width, b->height, /* size */
2239 b->width * sizeof(GLushort), /* stride */
2240 b->backimage->data); /* dest buffer */
2241 }
2242 else if (b->xm_visual->dithered_pf==PF_DITHER
2243 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2244 /* Special case: 8bpp RGB */
2245 for (y=0;y<b->height;y++) {
2246 GLubyte *ptr = (GLubyte*) b->backimage->data
2247 + b->backimage->bytes_per_line * y;
2248 XDITHER_SETUP(y);
2249
2250 /* read row from 3Dfx frame buffer */
2251 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2252 0, b->FXctx->height-(b->height-y),
2253 b->width, 1,
2254 0,
2255 pixbuf );
2256
2257 /* write to XImage back buffer */
2258 for (x=0;x<b->width;x++) {
2259 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2260 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2261 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2262 *ptr++ = XDITHER( x, r, g, b);
2263 }
2264 }
2265 }
2266 else {
2267 /* General case: slow! */
2268 for (y=0;y<b->height;y++) {
2269 /* read row from 3Dfx frame buffer */
2270 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2271 0, b->FXctx->height-(b->height-y),
2272 b->width, 1,
2273 0,
2274 pixbuf );
2275
2276 /* write to XImage back buffer */
2277 for (x=0;x<b->width;x++) {
2278 XMesaPutPixel(b->backimage,x,y,
2279 xmesa_color_to_pixel(xmesa,
2280 (pixbuf[x] & 0xf800) >> 8,
2281 (pixbuf[x] & 0x07e0) >> 3,
2282 (pixbuf[x] & 0x001f) << 3,
2283 0xff,
2284 b->xm_visual->undithered_pf));
2285 }
2286 }
2287 }
2288 grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
2289 }
2290 #endif
2291
2292
2293 /*
2294 * Copy the back buffer to the front buffer. If there's no back buffer
2295 * this is a no-op.
2296 */
2297 void XMesaSwapBuffers( XMesaBuffer b )
2298 {
2299 GET_CURRENT_CONTEXT(ctx);
2300
2301 /* If we're swapping the buffer associated with the current context
2302 * we have to flush any pending rendering commands first.
2303 */
2304 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2305 _mesa_notifySwapBuffers(ctx);
2306
2307 if (b->db_state) {
2308 #ifdef FX
2309 if (b->FXctx) {
2310 fxMesaSwapBuffers();
2311
2312 if (b->FXwindowHack)
2313 FXgetImage(b);
2314 else
2315 return;
2316 }
2317 #endif
2318 if (b->backimage) {
2319 /* Copy Ximage from host's memory to server's window */
2320 #if defined(USE_XSHM) && !defined(XFree86Server)
2321 if (b->shm) {
2322 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2323 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2324 b->swapgc,
2325 b->backimage, 0, 0,
2326 0, 0, b->width, b->height, False );
2327 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2328 }
2329 else
2330 #endif
2331 {
2332 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2333 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2334 b->swapgc,
2335 b->backimage, 0, 0,
2336 0, 0, b->width, b->height );
2337 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2338 }
2339 }
2340 else {
2341 /* Copy pixmap to window on server */
2342 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2343 XMesaCopyArea( b->xm_visual->display,
2344 b->backpixmap, /* source drawable */
2345 b->frontbuffer, /* dest. drawable */
2346 b->swapgc,
2347 0, 0, b->width, b->height, /* source region */
2348 0, 0 /* dest region */
2349 );
2350 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2351 }
2352 }
2353 #if !defined(XFree86Server)
2354 XSync( b->xm_visual->display, False );
2355 #endif
2356 }
2357
2358
2359
2360 /*
2361 * Copy sub-region of back buffer to front buffer
2362 */
2363 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2364 {
2365 GET_CURRENT_CONTEXT(ctx);
2366
2367 /* If we're swapping the buffer associated with the current context
2368 * we have to flush any pending rendering commands first.
2369 */
2370 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2371 _mesa_notifySwapBuffers(ctx);
2372
2373 if (b->db_state) {
2374 int yTop = b->height - y - height;
2375 #ifdef FX
2376 if (b->FXctx) {
2377 fxMesaSwapBuffers();
2378 if (b->FXwindowHack)
2379 FXgetImage(b);
2380 else
2381 return;
2382 }
2383 #endif
2384 if (b->backimage) {
2385 /* Copy Ximage from host's memory to server's window */
2386 #if defined(USE_XSHM) && !defined(XFree86Server)
2387 if (b->shm) {
2388 /* XXX assuming width and height aren't too large! */
2389 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2390 b->swapgc,
2391 b->backimage, x, yTop,
2392 x, yTop, width, height, False );
2393 /* wait for finished event??? */
2394 }
2395 else
2396 #endif
2397 {
2398 /* XXX assuming width and height aren't too large! */
2399 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2400 b->swapgc,
2401 b->backimage, x, yTop,
2402 x, yTop, width, height );
2403 }
2404 }
2405 else {
2406 /* Copy pixmap to window on server */
2407 XMesaCopyArea( b->xm_visual->display,
2408 b->backpixmap, /* source drawable */
2409 b->frontbuffer, /* dest. drawable */
2410 b->swapgc,
2411 x, yTop, width, height, /* source region */
2412 x, yTop /* dest region */
2413 );
2414 }
2415 }
2416 }
2417
2418
2419 /*
2420 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2421 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2422 * back buffer directly.
2423 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2424 * ximage - pointer to back buffer's XImage, or NULL
2425 * Return: GL_TRUE = context is double buffered
2426 * GL_FALSE = context is single buffered
2427 */
2428 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2429 XMesaPixmap *pixmap,
2430 XMesaImage **ximage )
2431 {
2432 if (b->db_state) {
2433 if (pixmap) *pixmap = b->backpixmap;
2434 if (ximage) *ximage = b->backimage;
2435 return GL_TRUE;
2436 }
2437 else {
2438 *pixmap = 0;
2439 *ximage = NULL;
2440 return GL_FALSE;
2441 }
2442 }
2443
2444
2445 /*
2446 * Return the depth buffer associated with an XMesaBuffer.
2447 * Input: b - the XMesa buffer handle
2448 * Output: width, height - size of buffer in pixels
2449 * bytesPerValue - bytes per depth value (2 or 4)
2450 * buffer - pointer to depth buffer values
2451 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2452 */
2453 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2454 GLint *bytesPerValue, void **buffer )
2455 {
2456 if (!b->mesa_buffer.DepthBuffer) {
2457 *width = 0;
2458 *height = 0;
2459 *bytesPerValue = 0;
2460 *buffer = 0;
2461 return GL_FALSE;
2462 }
2463 else {
2464 *width = b->mesa_buffer.Width;
2465 *height = b->mesa_buffer.Height;
2466 *bytesPerValue = sizeof(GLdepth);
2467 *buffer = b->mesa_buffer.DepthBuffer;
2468 return GL_TRUE;
2469 }
2470 }
2471
2472
2473 void XMesaFlush( XMesaContext c )
2474 {
2475 if (c && c->xm_visual) {
2476 #ifdef XFree86Server
2477 /* NOT_NEEDED */
2478 #else
2479 XSync( c->xm_visual->display, False );
2480 #endif
2481 }
2482 }
2483
2484
2485
2486 const char *XMesaGetString( XMesaContext c, int name )
2487 {
2488 (void) c;
2489 if (name==XMESA_VERSION) {
2490 return "5.0";
2491 }
2492 else if (name==XMESA_EXTENSIONS) {
2493 return "";
2494 }
2495 else {
2496 return NULL;
2497 }
2498 }
2499
2500
2501
2502 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2503 {
2504 XMesaBuffer b;
2505 for (b=XMesaBufferList; b; b=b->Next) {
2506 if (b->frontbuffer==d && b->display==dpy) {
2507 return b;
2508 }
2509 }
2510 return NULL;
2511 }
2512
2513
2514
2515 /*
2516 * Look for XMesaBuffers whose X window has been destroyed.
2517 * Deallocate any such XMesaBuffers.
2518 */
2519 void XMesaGarbageCollect( void )
2520 {
2521 XMesaBuffer b, next;
2522 for (b=XMesaBufferList; b; b=next) {
2523 next = b->Next;
2524 if (b->display && b->frontbuffer && b->type == WINDOW) {
2525 #ifdef XFree86Server
2526 /* NOT_NEEDED */
2527 #else
2528 XSync(b->display, False);
2529 if (!window_exists( b->display, b->frontbuffer )) {
2530 /* found a dead window, free the ancillary info */
2531 XMesaDestroyBuffer( b );
2532 }
2533 #endif
2534 }
2535 }
2536 }
2537
2538
2539 void XMesaReset( void )
2540 {
2541 while (XMesaBufferList)
2542 XMesaDestroyBuffer(XMesaBufferList);
2543
2544 XMesaBufferList = NULL;
2545 }
2546
2547
2548 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2549 GLfloat red, GLfloat green,
2550 GLfloat blue, GLfloat alpha )
2551 {
2552 GLint r = (GLint) (red * 255.0F);
2553 GLint g = (GLint) (green * 255.0F);
2554 GLint b = (GLint) (blue * 255.0F);
2555 GLint a = (GLint) (alpha * 255.0F);
2556
2557 switch (xmesa->pixelformat) {
2558 case PF_INDEX:
2559 return 0;
2560 case PF_TRUECOLOR:
2561 {
2562 unsigned long p;
2563 PACK_TRUECOLOR( p, r, g, b );
2564 return p;
2565 }
2566 case PF_8A8B8G8R:
2567 return PACK_8A8B8G8R( r, g, b, a );
2568 case PF_8R8G8B:
2569 return PACK_8R8G8B( r, g, b );
2570 case PF_5R6G5B:
2571 return PACK_5R6G5B( r, g, b );
2572 case PF_DITHER:
2573 {
2574 DITHER_SETUP;
2575 return DITHER( x, y, r, g, b );
2576 }
2577 case PF_1BIT:
2578 /* 382 = (3*255)/2 */
2579 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2580 case PF_HPCR:
2581 return DITHER_HPCR(x, y, r, g, b);
2582 case PF_LOOKUP:
2583 {
2584 LOOKUP_SETUP;
2585 return LOOKUP( r, g, b );
2586 }
2587 case PF_GRAYSCALE:
2588 return GRAY_RGB( r, g, b );
2589 case PF_DITHER_5R6G5B:
2590 /* fall through */
2591 case PF_TRUEDITHER:
2592 {
2593 unsigned long p;
2594 PACK_TRUEDITHER(p, x, y, r, g, b);
2595 return p;
2596 }
2597 default:
2598 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2599 }
2600 return 0;
2601 }
2602
2603
2604 /*
2605 * This is typically called when the window size changes and we need
2606 * to reallocate the buffer's back/depth/stencil/accum buffers.
2607 */
2608 void XMesaResizeBuffers( XMesaBuffer b )
2609 {
2610 xmesa_resize_buffers( &(b->mesa_buffer) );
2611
2612 }
2613