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make render_quads_verts call EMIT_PRIM with the arguments in the right order,
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.3
4 *
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /*
26 * This file contains the implementations of all the XMesa* functions.
27 *
28 *
29 * NOTES:
30 *
31 * The window coordinate system origin (0,0) is in the lower-left corner
32 * of the window. X11's window coordinate origin is in the upper-left
33 * corner of the window. Therefore, most drawing functions in this
34 * file have to flip Y coordinates.
35 *
36 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
37 * in support for the MIT Shared Memory extension. If enabled, when you
38 * use an Ximage for the back buffer in double buffered mode, the "swap"
39 * operation will be faster. You must also link with -lXext.
40 *
41 * Byte swapping: If the Mesa host and the X display use a different
42 * byte order then there's some trickiness to be aware of when using
43 * XImages. The byte ordering used for the XImage is that of the X
44 * display, not the Mesa host.
45 * The color-to-pixel encoding for True/DirectColor must be done
46 * according to the display's visual red_mask, green_mask, and blue_mask.
47 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
48 * do byte swapping if needed. If one wants to directly "poke" the pixel
49 * into the XImage's buffer then the pixel must be byte swapped first. In
50 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
51 * and use XPutPixel everywhere except in the implementation of
52 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
53 * instead of using XPutPixel we "poke" our values after byte-swapping
54 * the clear pixel value if needed.
55 *
56 */
57
58 #ifdef __CYGWIN__
59 #undef WIN32
60 #undef __WIN32__
61 #endif
62
63 #include "glxheader.h"
64 #include "GL/xmesa.h"
65 #include "xmesaP.h"
66 #include "context.h"
67 #include "extensions.h"
68 #include "glthread.h"
69 #include "imports.h"
70 #include "matrix.h"
71 #include "mtypes.h"
72 #include "macros.h"
73 #include "texformat.h"
74 #include "texobj.h"
75 #include "texstore.h"
76 #include "swrast/swrast.h"
77 #include "swrast_setup/swrast_setup.h"
78 #include "array_cache/acache.h"
79 #include "tnl/tnl.h"
80 #include "tnl/t_context.h"
81 #include "tnl/t_pipeline.h"
82 #include "drivers/common/driverfuncs.h"
83
84 #ifdef XFree86Server
85 #include <GL/glxtokens.h>
86 #endif
87
88 /*
89 * Global X driver lock
90 */
91 _glthread_Mutex _xmesa_lock;
92
93
94
95 /*
96 * Lookup tables for HPCR pixel format:
97 */
98 static short hpcr_rgbTbl[3][256] = {
99 {
100 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
101 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
102 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
103 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
104 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
105 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
106 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
107 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
108 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
109 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
110 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
111 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
112 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
113 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
114 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
115 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
116 },
117 {
118 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
119 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
120 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
121 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
122 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
123 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
124 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
125 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
126 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
127 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
128 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
129 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
130 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
131 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
132 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
133 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
134 },
135 {
136 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
137 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
138 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
139 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
140 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
141 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
142 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
143 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
144 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
145 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
146 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
147 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
148 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
149 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
150 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
151 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
152 }
153 };
154
155
156
157 /**********************************************************************/
158 /***** X Utility Functions *****/
159 /**********************************************************************/
160
161
162 /*
163 * Return the host's byte order as LSBFirst or MSBFirst ala X.
164 */
165 #ifndef XFree86Server
166 static int host_byte_order( void )
167 {
168 int i = 1;
169 char *cptr = (char *) &i;
170 return (*cptr==1) ? LSBFirst : MSBFirst;
171 }
172 #endif
173
174
175 /*
176 * Error handling.
177 */
178 #ifndef XFree86Server
179 static volatile int mesaXErrorFlag = 0;
180
181 static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
182 {
183 (void) dpy;
184 (void) event;
185 mesaXErrorFlag = 1;
186 return 0;
187 }
188 #endif
189
190
191 /*
192 * Check if the X Shared Memory extension is available.
193 * Return: 0 = not available
194 * 1 = shared XImage support available
195 * 2 = shared Pixmap support available also
196 */
197 #ifndef XFree86Server
198 static int check_for_xshm( XMesaDisplay *display )
199 {
200 #ifdef USE_XSHM
201 int major, minor, ignore;
202 Bool pixmaps;
203
204 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
205 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
206 return (pixmaps==True) ? 2 : 1;
207 }
208 else {
209 return 0;
210 }
211 }
212 else {
213 return 0;
214 }
215 #else
216 /* Can't compile XSHM support */
217 return 0;
218 #endif
219 }
220 #endif
221
222
223 /*
224 * Return the width and height of the given drawable.
225 */
226 static void get_drawable_size( XMesaDisplay *dpy, XMesaDrawable d,
227 unsigned int *width, unsigned int *height)
228 {
229 #ifdef XFree86Server
230 (void) dpy;
231 *width = d->width;
232 *height = d->height;
233 #else
234 Window root;
235 int x, y;
236 unsigned int bw, depth;
237
238 _glthread_LOCK_MUTEX(_xmesa_lock);
239 XGetGeometry( dpy, d, &root, &x, &y, width, height, &bw, &depth );
240 _glthread_UNLOCK_MUTEX(_xmesa_lock);
241 #endif
242 }
243
244
245 /*
246 * Apply gamma correction to an intensity value in [0..max]. Return the
247 * new intensity value.
248 */
249 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
250 {
251 if (gamma == 1.0) {
252 return value;
253 }
254 else {
255 double x = (double) value / (double) max;
256 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
257 }
258 }
259
260
261
262 /*
263 * Return the true number of bits per pixel for XImages.
264 * For example, if we request a 24-bit deep visual we may actually need/get
265 * 32bpp XImages. This function returns the appropriate bpp.
266 * Input: dpy - the X display
267 * visinfo - desribes the visual to be used for XImages
268 * Return: true number of bits per pixel for XImages
269 */
270 #ifdef XFree86Server
271
272 static int bits_per_pixel( XMesaVisual xmv )
273 {
274 const int depth = xmv->nplanes;
275 int i;
276 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
277 if (screenInfo.formats[i].depth == depth)
278 return screenInfo.formats[i].bitsPerPixel;
279 }
280 return depth; /* should never get here, but this should be safe */
281 }
282
283 #else
284
285 static int bits_per_pixel( XMesaVisual xmv )
286 {
287 XMesaDisplay *dpy = xmv->display;
288 XMesaVisualInfo visinfo = xmv->visinfo;
289 XMesaImage *img;
290 int bitsPerPixel;
291 /* Create a temporary XImage */
292 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
293 ZPixmap, 0, /*format, offset*/
294 (char*) MALLOC(8), /*data*/
295 1, 1, /*width, height*/
296 32, /*bitmap_pad*/
297 0 /*bytes_per_line*/
298 );
299 assert(img);
300 /* grab the bits/pixel value */
301 bitsPerPixel = img->bits_per_pixel;
302 /* free the XImage */
303 FREE( img->data );
304 img->data = NULL;
305 XMesaDestroyImage( img );
306 return bitsPerPixel;
307 }
308 #endif
309
310
311
312 /*
313 * Determine if a given X window ID is valid (window exists).
314 * Do this by calling XGetWindowAttributes() for the window and
315 * checking if we catch an X error.
316 * Input: dpy - the display
317 * win - the window to check for existance
318 * Return: GL_TRUE - window exists
319 * GL_FALSE - window doesn't exist
320 */
321 #ifndef XFree86Server
322 static GLboolean WindowExistsFlag;
323
324 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
325 {
326 (void) dpy;
327 if (xerr->error_code == BadWindow) {
328 WindowExistsFlag = GL_FALSE;
329 }
330 return 0;
331 }
332
333 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
334 {
335 XWindowAttributes wa;
336 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
337 WindowExistsFlag = GL_TRUE;
338 old_handler = XSetErrorHandler(window_exists_err_handler);
339 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
340 XSetErrorHandler(old_handler);
341 return WindowExistsFlag;
342 }
343 #endif
344
345
346
347 /**********************************************************************/
348 /***** Linked list of XMesaBuffers *****/
349 /**********************************************************************/
350
351 static XMesaBuffer XMesaBufferList = NULL;
352
353
354 /* Allocate a new XMesaBuffer, add to linked list */
355 static XMesaBuffer alloc_xmesa_buffer(void)
356 {
357 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
358 if (b) {
359 b->Next = XMesaBufferList;
360 XMesaBufferList = b;
361 }
362 return b;
363 }
364
365
366 /*
367 * Find an XMesaBuffer by matching X display and colormap but NOT matching
368 * the notThis buffer.
369 */
370 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
371 XMesaColormap cmap,
372 XMesaBuffer notThis)
373 {
374 XMesaBuffer b;
375 for (b=XMesaBufferList; b; b=b->Next) {
376 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
377 return b;
378 }
379 }
380 return NULL;
381 }
382
383
384 /*
385 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
386 * entries.
387 */
388 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
389 {
390 XMesaBuffer prev = NULL, b;
391 (void) client;
392 for (b=XMesaBufferList; b; b=b->Next) {
393 if (b==buffer) {
394 /* unlink bufer from list */
395 if (prev)
396 prev->Next = buffer->Next;
397 else
398 XMesaBufferList = buffer->Next;
399 /* Check to free X colors */
400 if (buffer->num_alloced>0) {
401 /* If no other buffer uses this X colormap then free the colors. */
402 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
403 #ifdef XFree86Server
404 (void)FreeColors(buffer->cmap, client,
405 buffer->num_alloced, buffer->alloced_colors,
406 0);
407 #else
408 XFreeColors(buffer->display, buffer->cmap,
409 buffer->alloced_colors, buffer->num_alloced, 0);
410 #endif
411 }
412 }
413
414 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
415 FREE(buffer);
416
417 return;
418 }
419 /* continue search */
420 prev = b;
421 }
422 /* buffer not found in XMesaBufferList */
423 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
424 }
425
426
427 /* Copy X color table stuff from one XMesaBuffer to another. */
428 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
429 {
430 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
431 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
432 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
433 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
434 dst->num_alloced = src->num_alloced;
435 MEMCPY(dst->alloced_colors, src->alloced_colors,
436 sizeof(src->alloced_colors));
437 }
438
439
440
441 /**********************************************************************/
442 /***** Misc Private Functions *****/
443 /**********************************************************************/
444
445
446 /*
447 * Return number of bits set in n.
448 */
449 static int bitcount( unsigned long n )
450 {
451 int bits;
452 for (bits=0; n>0; n=n>>1) {
453 if (n&1) {
454 bits++;
455 }
456 }
457 return bits;
458 }
459
460
461
462 /*
463 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
464 * Return: GL_TRUE if success, GL_FALSE if error
465 */
466 #ifndef XFree86Server
467 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
468 {
469 #ifdef USE_XSHM
470 /*
471 * We have to do a _lot_ of error checking here to be sure we can
472 * really use the XSHM extension. It seems different servers trigger
473 * errors at different points if the extension won't work. Therefore
474 * we have to be very careful...
475 */
476 GC gc;
477 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
478
479 b->backimage = XShmCreateImage( b->xm_visual->display,
480 b->xm_visual->visinfo->visual,
481 b->xm_visual->visinfo->depth,
482 ZPixmap, NULL, &b->shminfo,
483 b->width, b->height );
484 if (b->backimage == NULL) {
485 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
486 b->shm = 0;
487 return GL_FALSE;
488 }
489
490 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
491 * b->backimage->height, IPC_CREAT|0777 );
492 if (b->shminfo.shmid < 0) {
493 _mesa_warning(NULL, "shmget failed while allocating back buffer");
494 XDestroyImage( b->backimage );
495 b->backimage = NULL;
496 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.");
497 b->shm = 0;
498 return GL_FALSE;
499 }
500
501 b->shminfo.shmaddr = b->backimage->data
502 = (char*)shmat( b->shminfo.shmid, 0, 0 );
503 if (b->shminfo.shmaddr == (char *) -1) {
504 _mesa_warning(NULL, "shmat() failed while allocating back buffer");
505 XDestroyImage( b->backimage );
506 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
507 b->backimage = NULL;
508 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.");
509 b->shm = 0;
510 return GL_FALSE;
511 }
512
513 b->shminfo.readOnly = False;
514 mesaXErrorFlag = 0;
515 old_handler = XSetErrorHandler( mesaHandleXError );
516 /* This may trigger the X protocol error we're ready to catch: */
517 XShmAttach( b->xm_visual->display, &b->shminfo );
518 XSync( b->xm_visual->display, False );
519
520 if (mesaXErrorFlag) {
521 /* we are on a remote display, this error is normal, don't print it */
522 XFlush( b->xm_visual->display );
523 mesaXErrorFlag = 0;
524 XDestroyImage( b->backimage );
525 shmdt( b->shminfo.shmaddr );
526 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
527 b->backimage = NULL;
528 b->shm = 0;
529 (void) XSetErrorHandler( old_handler );
530 return GL_FALSE;
531 }
532
533 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
534
535 /* Finally, try an XShmPutImage to be really sure the extension works */
536 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
537 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
538 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
539 XSync( b->xm_visual->display, False );
540 XFreeGC( b->xm_visual->display, gc );
541 (void) XSetErrorHandler( old_handler );
542 if (mesaXErrorFlag) {
543 XFlush( b->xm_visual->display );
544 mesaXErrorFlag = 0;
545 XDestroyImage( b->backimage );
546 shmdt( b->shminfo.shmaddr );
547 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
548 b->backimage = NULL;
549 b->shm = 0;
550 return GL_FALSE;
551 }
552
553 if (b->backimage) {
554 int height = b->backimage->height;
555 /* Needed by PIXELADDR1 macro */
556 b->ximage_width1 = b->backimage->bytes_per_line;
557 b->ximage_origin1 = (GLubyte *) b->backimage->data
558 + b->ximage_width1 * (height-1);
559 /* Needed by PIXELADDR2 macro */
560 b->ximage_width2 = b->backimage->bytes_per_line / 2;
561 b->ximage_origin2 = (GLushort *) b->backimage->data
562 + b->ximage_width2 * (height-1);
563 /* Needed by PIXELADDR3 macro */
564 b->ximage_width3 = b->backimage->bytes_per_line;
565 b->ximage_origin3 = (GLubyte *) b->backimage->data
566 + b->ximage_width3 * (height-1);
567 /* Needed by PIXELADDR4 macro */
568 b->ximage_width4 = b->backimage->width;
569 b->ximage_origin4 = (GLuint *) b->backimage->data
570 + b->ximage_width4 * (height-1);
571 }
572
573 return GL_TRUE;
574 #else
575 /* Can't compile XSHM support */
576 return GL_FALSE;
577 #endif
578 }
579 #endif
580
581
582
583 /*
584 * Setup an off-screen pixmap or Ximage to use as the back buffer.
585 * Input: b - the X/Mesa buffer
586 */
587 void xmesa_alloc_back_buffer( XMesaBuffer b )
588 {
589 if (b->db_state==BACK_XIMAGE) {
590 /* Deallocate the old backimage, if any */
591 if (b->backimage) {
592 #if defined(USE_XSHM) && !defined(XFree86Server)
593 if (b->shm) {
594 XShmDetach( b->xm_visual->display, &b->shminfo );
595 XDestroyImage( b->backimage );
596 shmdt( b->shminfo.shmaddr );
597 }
598 else
599 #endif
600 XMesaDestroyImage( b->backimage );
601 b->backimage = NULL;
602 }
603
604 /* Allocate new back buffer */
605 #ifdef XFree86Server
606 {
607 /* Allocate a regular XImage for the back buffer. */
608 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
609 b->width, b->height, NULL);
610 #else
611 if (b->shm==0 || alloc_shm_back_buffer(b)==GL_FALSE) {
612 /* Allocate a regular XImage for the back buffer. */
613 b->backimage = XCreateImage( b->xm_visual->display,
614 b->xm_visual->visinfo->visual,
615 GET_VISUAL_DEPTH(b->xm_visual),
616 ZPixmap, 0, /* format, offset */
617 NULL, b->width, b->height,
618 8, 0 ); /* pad, bytes_per_line */
619 #endif
620 if (!b->backimage) {
621 _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.");
622 }
623 b->backimage->data = (char *) MALLOC( b->backimage->height
624 * b->backimage->bytes_per_line );
625 if (!b->backimage->data) {
626 _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.");
627 XMesaDestroyImage( b->backimage );
628 b->backimage = NULL;
629 }
630 }
631 b->backpixmap = None;
632 }
633 else if (b->db_state==BACK_PIXMAP) {
634 XMesaPixmap old_pixmap = b->backpixmap;
635 /* Free the old back pixmap */
636 if (b->backpixmap) {
637 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
638 }
639 /* Allocate new back pixmap */
640 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
641 b->width, b->height,
642 GET_VISUAL_DEPTH(b->xm_visual) );
643 b->backimage = NULL;
644 /* update other references to backpixmap */
645 if (b->buffer==(XMesaDrawable)old_pixmap) {
646 b->buffer = (XMesaDrawable)b->backpixmap;
647 }
648 }
649 }
650
651
652
653 /*
654 * A replacement for XAllocColor. This function should never
655 * fail to allocate a color. When XAllocColor fails, we return
656 * the nearest matching color. If we have to allocate many colors
657 * this function isn't too efficient; the XQueryColors() could be
658 * done just once.
659 * Written by Michael Pichler, Brian Paul, Mark Kilgard
660 * Input: dpy - X display
661 * cmap - X colormap
662 * cmapSize - size of colormap
663 * In/Out: color - the XColor struct
664 * Output: exact - 1=exact color match, 0=closest match
665 * alloced - 1=XAlloc worked, 0=XAlloc failed
666 */
667 static void
668 noFaultXAllocColor( int client,
669 XMesaDisplay *dpy,
670 XMesaColormap cmap,
671 int cmapSize,
672 XMesaColor *color,
673 int *exact, int *alloced )
674 {
675 #ifdef XFree86Server
676 Pixel *ppixIn;
677 xrgb *ctable;
678 #else
679 /* we'll try to cache ctable for better remote display performance */
680 static Display *prevDisplay = NULL;
681 static XMesaColormap prevCmap = 0;
682 static int prevCmapSize = 0;
683 static XMesaColor *ctable = NULL;
684 #endif
685 XMesaColor subColor;
686 int i, bestmatch;
687 double mindist; /* 3*2^16^2 exceeds long int precision. */
688
689 (void) client;
690
691 /* First try just using XAllocColor. */
692 #ifdef XFree86Server
693 if (AllocColor(cmap,
694 &color->red, &color->green, &color->blue,
695 &color->pixel,
696 client) == Success) {
697 #else
698 if (XAllocColor(dpy, cmap, color)) {
699 #endif
700 *exact = 1;
701 *alloced = 1;
702 return;
703 }
704
705 /* Alloc failed, search for closest match */
706
707 /* Retrieve color table entries. */
708 /* XXX alloca candidate. */
709 #ifdef XFree86Server
710 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
711 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
712 for (i = 0; i < cmapSize; i++) {
713 ppixIn[i] = i;
714 }
715 QueryColors(cmap, cmapSize, ppixIn, ctable);
716 #else
717 if (prevDisplay != dpy || prevCmap != cmap
718 || prevCmapSize != cmapSize || !ctable) {
719 /* free previously cached color table */
720 if (ctable)
721 FREE(ctable);
722 /* Get the color table from X */
723 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
724 assert(ctable);
725 for (i = 0; i < cmapSize; i++) {
726 ctable[i].pixel = i;
727 }
728 XQueryColors(dpy, cmap, ctable, cmapSize);
729 prevDisplay = dpy;
730 prevCmap = cmap;
731 prevCmapSize = cmapSize;
732 }
733 #endif
734
735 /* Find best match. */
736 bestmatch = -1;
737 mindist = 0.0;
738 for (i = 0; i < cmapSize; i++) {
739 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
740 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
741 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
742 double dist = dr * dr + dg * dg + db * db;
743 if (bestmatch < 0 || dist < mindist) {
744 bestmatch = i;
745 mindist = dist;
746 }
747 }
748
749 /* Return result. */
750 subColor.red = ctable[bestmatch].red;
751 subColor.green = ctable[bestmatch].green;
752 subColor.blue = ctable[bestmatch].blue;
753 /* Try to allocate the closest match color. This should only
754 * fail if the cell is read/write. Otherwise, we're incrementing
755 * the cell's reference count.
756 */
757 #ifdef XFree86Server
758 if (AllocColor(cmap,
759 &subColor.red, &subColor.green, &subColor.blue,
760 &subColor.pixel,
761 client) == Success) {
762 #else
763 if (XAllocColor(dpy, cmap, &subColor)) {
764 #endif
765 *alloced = 1;
766 }
767 else {
768 /* do this to work around a problem reported by Frank Ortega */
769 subColor.pixel = (unsigned long) bestmatch;
770 subColor.red = ctable[bestmatch].red;
771 subColor.green = ctable[bestmatch].green;
772 subColor.blue = ctable[bestmatch].blue;
773 subColor.flags = DoRed | DoGreen | DoBlue;
774 *alloced = 0;
775 }
776 #ifdef XFree86Server
777 FREE(ppixIn);
778 FREE(ctable);
779 #else
780 /* don't free table, save it for next time */
781 #endif
782
783 *color = subColor;
784 *exact = 0;
785 }
786
787
788
789
790 /*
791 * Do setup for PF_GRAYSCALE pixel format.
792 * Note that buffer may be NULL.
793 */
794 static GLboolean setup_grayscale( int client, XMesaVisual v,
795 XMesaBuffer buffer, XMesaColormap cmap )
796 {
797 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
798 return GL_FALSE;
799 }
800
801 if (buffer) {
802 XMesaBuffer prevBuffer;
803
804 if (!cmap) {
805 return GL_FALSE;
806 }
807
808 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
809 if (prevBuffer &&
810 (buffer->xm_visual->mesa_visual.rgbMode ==
811 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
812 /* Copy colormap stuff from previous XMesaBuffer which uses same
813 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
814 */
815 copy_colortable_info(buffer, prevBuffer);
816 }
817 else {
818 /* Allocate 256 shades of gray */
819 int gray;
820 int colorsfailed = 0;
821 for (gray=0;gray<256;gray++) {
822 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
823 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
824 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
825 int exact, alloced;
826 XMesaColor xcol;
827 xcol.red = (r << 8) | r;
828 xcol.green = (g << 8) | g;
829 xcol.blue = (b << 8) | b;
830 noFaultXAllocColor( client, v->display,
831 cmap, GET_COLORMAP_SIZE(v),
832 &xcol, &exact, &alloced );
833 if (!exact) {
834 colorsfailed++;
835 }
836 if (alloced) {
837 assert(buffer->num_alloced<256);
838 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
839 buffer->num_alloced++;
840 }
841
842 /*OLD
843 assert(gray < 576);
844 buffer->color_table[gray*3+0] = xcol.pixel;
845 buffer->color_table[gray*3+1] = xcol.pixel;
846 buffer->color_table[gray*3+2] = xcol.pixel;
847 assert(xcol.pixel < 65536);
848 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
849 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
850 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
851 */
852 buffer->color_table[gray] = xcol.pixel;
853 assert(xcol.pixel < 65536);
854 buffer->pixel_to_r[xcol.pixel] = gray;
855 buffer->pixel_to_g[xcol.pixel] = gray;
856 buffer->pixel_to_b[xcol.pixel] = gray;
857 }
858
859 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
860 _mesa_warning(NULL,
861 "Note: %d out of 256 needed colors do not match exactly.\n",
862 colorsfailed );
863 }
864 }
865 }
866
867 v->dithered_pf = PF_Grayscale;
868 v->undithered_pf = PF_Grayscale;
869 return GL_TRUE;
870 }
871
872
873
874 /*
875 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
876 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
877 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
878 * color. While this function was originally designed just for 8-bit
879 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
880 * Dithering code contributed by Bob Mercier.
881 */
882 static GLboolean setup_dithered_color( int client, XMesaVisual v,
883 XMesaBuffer buffer, XMesaColormap cmap )
884 {
885 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
886 return GL_FALSE;
887 }
888
889 if (buffer) {
890 XMesaBuffer prevBuffer;
891
892 if (!cmap) {
893 return GL_FALSE;
894 }
895
896 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
897 if (prevBuffer &&
898 (buffer->xm_visual->mesa_visual.rgbMode ==
899 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
900 /* Copy colormap stuff from previous, matching XMesaBuffer.
901 * Do this to avoid time spent in noFaultXAllocColor.
902 */
903 copy_colortable_info(buffer, prevBuffer);
904 }
905 else {
906 /* Allocate X colors and initialize color_table[], red_table[], etc */
907 int r, g, b, i;
908 int colorsfailed = 0;
909 for (r = 0; r < DITH_R; r++) {
910 for (g = 0; g < DITH_G; g++) {
911 for (b = 0; b < DITH_B; b++) {
912 XMesaColor xcol;
913 int exact, alloced;
914 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
915 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
916 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
917 noFaultXAllocColor( client, v->display,
918 cmap, GET_COLORMAP_SIZE(v),
919 &xcol, &exact, &alloced );
920 if (!exact) {
921 colorsfailed++;
922 }
923 if (alloced) {
924 assert(buffer->num_alloced<256);
925 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
926 buffer->num_alloced++;
927 }
928 i = DITH_MIX( r, g, b );
929 assert(i < 576);
930 buffer->color_table[i] = xcol.pixel;
931 assert(xcol.pixel < 65536);
932 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
933 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
934 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
935 }
936 }
937 }
938
939 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
940 _mesa_warning(NULL,
941 "Note: %d out of %d needed colors do not match exactly.\n",
942 colorsfailed, DITH_R * DITH_G * DITH_B );
943 }
944 }
945 }
946
947 v->dithered_pf = PF_Dither;
948 v->undithered_pf = PF_Lookup;
949 return GL_TRUE;
950 }
951
952
953 /*
954 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
955 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
956 * Special dithering tables have to be initialized.
957 */
958 static void setup_8bit_hpcr( XMesaVisual v )
959 {
960 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
961 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
962 * on the root window AND the colormap obtainable by XGetRGBColormaps
963 * for that atom must be set on the window. (see also tkInitWindow)
964 * If that colormap is not set, the output will look stripy.
965 */
966
967 /* Setup color tables with gamma correction */
968 int i;
969 double g;
970
971 g = 1.0 / v->RedGamma;
972 for (i=0; i<256; i++) {
973 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
974 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
975 }
976
977 g = 1.0 / v->GreenGamma;
978 for (i=0; i<256; i++) {
979 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
980 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
981 }
982
983 g = 1.0 / v->BlueGamma;
984 for (i=0; i<256; i++) {
985 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
986 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
987 }
988 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
989 v->dithered_pf = PF_HPCR;
990
991 /* which method should I use to clear */
992 /* GL_FALSE: keep the ordinary method */
993 /* GL_TRUE : clear with dither pattern */
994 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
995
996 if (v->hpcr_clear_flag) {
997 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
998 DefaultRootWindow(v->display),
999 16, 2, 8);
1000 #ifndef XFree86Server
1001 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
1002 0, 0, 16, 2, AllPlanes, ZPixmap);
1003 #endif
1004 }
1005 }
1006
1007
1008 /*
1009 * Setup RGB rendering for a window with a True/DirectColor visual.
1010 */
1011 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
1012 XMesaColormap cmap )
1013 {
1014 unsigned long rmask, gmask, bmask;
1015 (void) buffer;
1016 (void) cmap;
1017
1018 /* Compute red multiplier (mask) and bit shift */
1019 v->rshift = 0;
1020 rmask = GET_REDMASK(v);
1021 while ((rmask & 1)==0) {
1022 v->rshift++;
1023 rmask = rmask >> 1;
1024 }
1025
1026 /* Compute green multiplier (mask) and bit shift */
1027 v->gshift = 0;
1028 gmask = GET_GREENMASK(v);
1029 while ((gmask & 1)==0) {
1030 v->gshift++;
1031 gmask = gmask >> 1;
1032 }
1033
1034 /* Compute blue multiplier (mask) and bit shift */
1035 v->bshift = 0;
1036 bmask = GET_BLUEMASK(v);
1037 while ((bmask & 1)==0) {
1038 v->bshift++;
1039 bmask = bmask >> 1;
1040 }
1041
1042 /*
1043 * Compute component-to-pixel lookup tables and dithering kernel
1044 */
1045 {
1046 static GLubyte kernel[16] = {
1047 0*16, 8*16, 2*16, 10*16,
1048 12*16, 4*16, 14*16, 6*16,
1049 3*16, 11*16, 1*16, 9*16,
1050 15*16, 7*16, 13*16, 5*16,
1051 };
1052 GLint rBits = bitcount(rmask);
1053 GLint gBits = bitcount(gmask);
1054 GLint bBits = bitcount(bmask);
1055 GLint maxBits;
1056 GLuint i;
1057
1058 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1059 for (i=0; i<=rmask; i++)
1060 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1061 for (i=0; i<=gmask; i++)
1062 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1063 for (i=0; i<=bmask; i++)
1064 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1065
1066 /* convert RGB values from [0,255] to pixel components */
1067
1068 for (i=0;i<256;i++) {
1069 GLint r = gamma_adjust(v->RedGamma, i, 255);
1070 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1071 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1072 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1073 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1074 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1075 }
1076 /* overflow protection */
1077 for (i=256;i<512;i++) {
1078 v->RtoPixel[i] = v->RtoPixel[255];
1079 v->GtoPixel[i] = v->GtoPixel[255];
1080 v->BtoPixel[i] = v->BtoPixel[255];
1081 }
1082
1083 /* setup dithering kernel */
1084 maxBits = rBits;
1085 if (gBits > maxBits) maxBits = gBits;
1086 if (bBits > maxBits) maxBits = bBits;
1087 for (i=0;i<16;i++) {
1088 v->Kernel[i] = kernel[i] >> maxBits;
1089 }
1090
1091 v->undithered_pf = PF_Truecolor;
1092 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
1093 }
1094
1095 /*
1096 * Now check for TrueColor visuals which we can optimize.
1097 */
1098 if ( GET_REDMASK(v) ==0x0000ff
1099 && GET_GREENMASK(v)==0x00ff00
1100 && GET_BLUEMASK(v) ==0xff0000
1101 && CHECK_BYTE_ORDER(v)
1102 && v->BitsPerPixel==32
1103 && sizeof(GLuint)==4
1104 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1105 /* common 32 bpp config used on SGI, Sun */
1106 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1107 }
1108 else if (GET_REDMASK(v) ==0xff0000
1109 && GET_GREENMASK(v)==0x00ff00
1110 && GET_BLUEMASK(v) ==0x0000ff
1111 && CHECK_BYTE_ORDER(v)
1112 && v->BitsPerPixel==32
1113 && sizeof(GLuint)==4
1114 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1115 /* common 32 bpp config used on Linux, HP, IBM */
1116 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1117 }
1118 else if (GET_REDMASK(v) ==0xff0000
1119 && GET_GREENMASK(v)==0x00ff00
1120 && GET_BLUEMASK(v) ==0x0000ff
1121 && CHECK_BYTE_ORDER(v)
1122 && v->BitsPerPixel==24
1123 && sizeof(GLuint)==4
1124 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1125 /* common packed 24 bpp config used on Linux */
1126 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1127 }
1128 else if (GET_REDMASK(v) ==0xf800
1129 && GET_GREENMASK(v)==0x07e0
1130 && GET_BLUEMASK(v) ==0x001f
1131 && CHECK_BYTE_ORDER(v)
1132 && v->BitsPerPixel==16
1133 && sizeof(GLushort)==2
1134 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1135 /* 5-6-5 color weight on common PC VGA boards */
1136 v->undithered_pf = PF_5R6G5B;
1137 v->dithered_pf = PF_Dither_5R6G5B;
1138 }
1139 else if (GET_REDMASK(v) ==0xe0
1140 && GET_GREENMASK(v)==0x1c
1141 && GET_BLUEMASK(v) ==0x03
1142 && CHECK_FOR_HPCR(v)) {
1143 setup_8bit_hpcr( v );
1144 }
1145 }
1146
1147
1148
1149 /*
1150 * Setup RGB rendering for a window with a monochrome visual.
1151 */
1152 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1153 {
1154 (void) b;
1155 v->dithered_pf = v->undithered_pf = PF_1Bit;
1156 /* if black=1 then we must flip pixel values */
1157 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1158 }
1159
1160
1161
1162 /*
1163 * When a context is "made current" for the first time, we can finally
1164 * finish initializing the context's visual and buffer information.
1165 * Input: v - the XMesaVisual to initialize
1166 * b - the XMesaBuffer to initialize (may be NULL)
1167 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1168 * window - the window/pixmap we're rendering into
1169 * cmap - the colormap associated with the window/pixmap
1170 * Return: GL_TRUE=success, GL_FALSE=failure
1171 */
1172 static GLboolean initialize_visual_and_buffer( int client,
1173 XMesaVisual v,
1174 XMesaBuffer b,
1175 GLboolean rgb_flag,
1176 XMesaDrawable window,
1177 XMesaColormap cmap )
1178 {
1179 #ifndef XFree86Server
1180 XGCValues gcvalues;
1181 #endif
1182
1183 if (b) {
1184 assert(b->xm_visual == v);
1185 }
1186
1187 /* Save true bits/pixel */
1188 v->BitsPerPixel = bits_per_pixel(v);
1189 assert(v->BitsPerPixel > 0);
1190
1191
1192 if (rgb_flag==GL_FALSE) {
1193 /* COLOR-INDEXED WINDOW:
1194 * Even if the visual is TrueColor or DirectColor we treat it as
1195 * being color indexed. This is weird but might be useful to someone.
1196 */
1197 v->dithered_pf = v->undithered_pf = PF_Index;
1198 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1199 }
1200 else {
1201 /* RGB WINDOW:
1202 * We support RGB rendering into almost any kind of visual.
1203 */
1204 const int xclass = v->mesa_visual.visualType;
1205 if (xclass==GLX_TRUE_COLOR || xclass==GLX_DIRECT_COLOR) {
1206 setup_truecolor( v, b, cmap );
1207 }
1208 else if (xclass==GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v)==1) {
1209 setup_monochrome( v, b );
1210 }
1211 else if (xclass==GLX_GRAY_SCALE || xclass==GLX_STATIC_GRAY) {
1212 if (!setup_grayscale( client, v, b, cmap )) {
1213 return GL_FALSE;
1214 }
1215 }
1216 else if ((xclass==GLX_PSEUDO_COLOR || xclass==GLX_STATIC_COLOR)
1217 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1218 if (!setup_dithered_color( client, v, b, cmap )) {
1219 return GL_FALSE;
1220 }
1221 }
1222 else {
1223 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.");
1224 return GL_FALSE;
1225 }
1226 v->mesa_visual.indexBits = 0;
1227
1228 if (_mesa_getenv("MESA_NO_DITHER")) {
1229 v->dithered_pf = v->undithered_pf;
1230 }
1231 }
1232
1233
1234 /*
1235 * If MESA_INFO env var is set print out some debugging info
1236 * which can help Brian figure out what's going on when a user
1237 * reports bugs.
1238 */
1239 if (_mesa_getenv("MESA_INFO")) {
1240 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1241 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1242 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1243 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1244 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1245 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1246 }
1247
1248 if (b && window) {
1249 /* Do window-specific initializations */
1250
1251 /* Window dimensions */
1252 unsigned int w, h;
1253 get_drawable_size( v->display, window, &w, &h );
1254 b->width = w;
1255 b->height = h;
1256
1257 b->frontbuffer = window;
1258
1259 /* Setup for single/double buffering */
1260 if (v->mesa_visual.doubleBufferMode) {
1261 /* Double buffered */
1262 #ifndef XFree86Server
1263 b->shm = check_for_xshm( v->display );
1264 #endif
1265 xmesa_alloc_back_buffer( b );
1266 if (b->db_state==BACK_PIXMAP) {
1267 b->buffer = (XMesaDrawable)b->backpixmap;
1268 }
1269 else {
1270 b->buffer = XIMAGE;
1271 }
1272 }
1273 else {
1274 /* Single Buffered */
1275 b->buffer = b->frontbuffer;
1276 }
1277
1278 /* X11 graphics contexts */
1279 #ifdef XFree86Server
1280 b->gc = CreateScratchGC(v->display, window->depth);
1281 #else
1282 b->gc = XCreateGC( v->display, window, 0, NULL );
1283 #endif
1284 XMesaSetFunction( v->display, b->gc, GXcopy );
1285
1286 /* cleargc - for glClear() */
1287 #ifdef XFree86Server
1288 b->cleargc = CreateScratchGC(v->display, window->depth);
1289 #else
1290 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1291 #endif
1292 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1293
1294 /*
1295 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1296 * Patch contributed by Michael Pichler May 15, 1995.
1297 */
1298 #ifdef XFree86Server
1299 b->swapgc = CreateScratchGC(v->display, window->depth);
1300 {
1301 CARD32 v[1];
1302 v[0] = FALSE;
1303 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1304 }
1305 #else
1306 gcvalues.graphics_exposures = False;
1307 b->swapgc = XCreateGC( v->display, window,
1308 GCGraphicsExposures, &gcvalues);
1309 #endif
1310 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1311 /*
1312 * Set fill style and tile pixmap once for all for HPCR stuff
1313 * (instead of doing it each time in clear_color_HPCR_pixmap())
1314 * Initialize whole stuff
1315 * Patch contributed by Jacques Leroy March 8, 1998.
1316 */
1317 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1318 int i;
1319 for (i=0; i<16; i++)
1320 {
1321 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1322 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1323 }
1324 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1325 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1326 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1327 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1328 }
1329
1330 /* Initialize the row buffer XImage for use in write_color_span() */
1331 #ifdef XFree86Server
1332 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1333 (char *)MALLOC(MAX_WIDTH*4));
1334 #else
1335 b->rowimage = XCreateImage( v->display,
1336 v->visinfo->visual,
1337 v->visinfo->depth,
1338 ZPixmap, 0, /*format, offset*/
1339 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1340 MAX_WIDTH, 1, /*width, height*/
1341 32, /*bitmap_pad*/
1342 0 /*bytes_per_line*/ );
1343 #endif
1344 if (!b->rowimage)
1345 return GL_FALSE;
1346 }
1347
1348 return GL_TRUE;
1349 }
1350
1351
1352
1353 /*
1354 * Convert an RGBA color to a pixel value.
1355 */
1356 unsigned long
1357 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1358 GLuint pixelFormat)
1359 {
1360 switch (pixelFormat) {
1361 case PF_Index:
1362 return 0;
1363 case PF_Truecolor:
1364 {
1365 unsigned long p;
1366 PACK_TRUECOLOR( p, r, g, b );
1367 return p;
1368 }
1369 case PF_8A8B8G8R:
1370 return PACK_8A8B8G8R( r, g, b, a );
1371 case PF_8R8G8B:
1372 /* fall through */
1373 case PF_8R8G8B24:
1374 return PACK_8R8G8B( r, g, b );
1375 case PF_5R6G5B:
1376 return PACK_5R6G5B( r, g, b );
1377 case PF_Dither:
1378 {
1379 DITHER_SETUP;
1380 return DITHER( 1, 0, r, g, b );
1381 }
1382 case PF_1Bit:
1383 /* 382 = (3*255)/2 */
1384 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1385 case PF_HPCR:
1386 return DITHER_HPCR(1, 1, r, g, b);
1387 case PF_Lookup:
1388 {
1389 LOOKUP_SETUP;
1390 return LOOKUP( r, g, b );
1391 }
1392 case PF_Grayscale:
1393 return GRAY_RGB( r, g, b );
1394 case PF_Dither_True:
1395 /* fall through */
1396 case PF_Dither_5R6G5B:
1397 {
1398 unsigned long p;
1399 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1400 return p;
1401 }
1402 default:
1403 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1404 }
1405 return 0;
1406 }
1407
1408
1409 #define NUM_VISUAL_TYPES 6
1410
1411 /**
1412 * Convert an X visual type to a GLX visual type.
1413 *
1414 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1415 * to be converted.
1416 * \return If \c visualType is a valid X visual type, a GLX visual type will
1417 * be returned. Otherwise \c GLX_NONE will be returned.
1418 *
1419 * \note
1420 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1421 * DRI CVS tree.
1422 */
1423 static GLint
1424 xmesa_convert_from_x_visual_type( int visualType )
1425 {
1426 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1427 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1428 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1429 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1430 };
1431
1432 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1433 ? glx_visual_types[ visualType ] : GLX_NONE;
1434 }
1435
1436
1437 /**********************************************************************/
1438 /***** Public Functions *****/
1439 /**********************************************************************/
1440
1441
1442 /*
1443 * Create a new X/Mesa visual.
1444 * Input: display - X11 display
1445 * visinfo - an XVisualInfo pointer
1446 * rgb_flag - GL_TRUE = RGB mode,
1447 * GL_FALSE = color index mode
1448 * alpha_flag - alpha buffer requested?
1449 * db_flag - GL_TRUE = double-buffered,
1450 * GL_FALSE = single buffered
1451 * stereo_flag - stereo visual?
1452 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1453 * GL_FALSE = use an off-screen pixmap for back buffer
1454 * depth_size - requested bits/depth values, or zero
1455 * stencil_size - requested bits/stencil values, or zero
1456 * accum_red_size - requested bits/red accum values, or zero
1457 * accum_green_size - requested bits/green accum values, or zero
1458 * accum_blue_size - requested bits/blue accum values, or zero
1459 * accum_alpha_size - requested bits/alpha accum values, or zero
1460 * num_samples - number of samples/pixel if multisampling, or zero
1461 * level - visual level, usually 0
1462 * visualCaveat - ala the GLX extension, usually GLX_NONE
1463 * Return; a new XMesaVisual or 0 if error.
1464 */
1465 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1466 XMesaVisualInfo visinfo,
1467 GLboolean rgb_flag,
1468 GLboolean alpha_flag,
1469 GLboolean db_flag,
1470 GLboolean stereo_flag,
1471 GLboolean ximage_flag,
1472 GLint depth_size,
1473 GLint stencil_size,
1474 GLint accum_red_size,
1475 GLint accum_green_size,
1476 GLint accum_blue_size,
1477 GLint accum_alpha_size,
1478 GLint num_samples,
1479 GLint level,
1480 GLint visualCaveat )
1481 {
1482 char *gamma;
1483 XMesaVisual v;
1484 GLint red_bits, green_bits, blue_bits, alpha_bits;
1485
1486 /* For debugging only */
1487 if (_mesa_getenv("MESA_XSYNC")) {
1488 /* This makes debugging X easier.
1489 * In your debugger, set a breakpoint on _XError to stop when an
1490 * X protocol error is generated.
1491 */
1492 #ifdef XFree86Server
1493 /* NOT_NEEDED */
1494 #else
1495 XSynchronize( display, 1 );
1496 #endif
1497 }
1498
1499 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1500 if (!v) {
1501 return NULL;
1502 }
1503
1504 /*
1505 * In the X server, NULL is passed in for the display. It will have
1506 * to be set before using this visual. See XMesaSetVisualDisplay()
1507 * below.
1508 */
1509 v->display = display;
1510
1511 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1512 * the struct but we may need some of the information contained in it
1513 * at a later time.
1514 */
1515 #ifndef XFree86Server
1516 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1517 if(!v->visinfo) {
1518 FREE(v);
1519 return NULL;
1520 }
1521 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1522 #endif
1523
1524 /* check for MESA_GAMMA environment variable */
1525 gamma = _mesa_getenv("MESA_GAMMA");
1526 if (gamma) {
1527 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1528 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1529 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1530 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1531 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1532 }
1533 else {
1534 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1535 }
1536
1537 v->ximage_flag = ximage_flag;
1538
1539 #ifdef XFree86Server
1540 /* We could calculate these values by ourselves. nplanes is either the sum
1541 * of the red, green, and blue bits or the number index bits.
1542 * ColormapEntries is either (1U << index_bits) or
1543 * (1U << max(redBits, greenBits, blueBits)).
1544 */
1545 v->nplanes = visinfo->nplanes;
1546 v->ColormapEntries = visinfo->ColormapEntries;
1547
1548 v->mesa_visual.redMask = visinfo->redMask;
1549 v->mesa_visual.greenMask = visinfo->greenMask;
1550 v->mesa_visual.blueMask = visinfo->blueMask;
1551 v->mesa_visual.visualID = visinfo->vid;
1552 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1553 #else
1554 v->mesa_visual.redMask = visinfo->red_mask;
1555 v->mesa_visual.greenMask = visinfo->green_mask;
1556 v->mesa_visual.blueMask = visinfo->blue_mask;
1557 v->mesa_visual.visualID = visinfo->visualid;
1558 v->mesa_visual.screen = visinfo->screen;
1559 #endif
1560
1561 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1562 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1563 #else
1564 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1565 #endif
1566
1567 v->mesa_visual.visualRating = visualCaveat;
1568
1569 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1570
1571 {
1572 const int xclass = v->mesa_visual.visualType;
1573 if (xclass==GLX_TRUE_COLOR || xclass==GLX_DIRECT_COLOR) {
1574 red_bits = bitcount(GET_REDMASK(v));
1575 green_bits = bitcount(GET_GREENMASK(v));
1576 blue_bits = bitcount(GET_BLUEMASK(v));
1577 alpha_bits = 0;
1578 }
1579 else {
1580 /* this is an approximation */
1581 int depth;
1582 depth = GET_VISUAL_DEPTH(v);
1583 red_bits = depth / 3;
1584 depth -= red_bits;
1585 green_bits = depth / 2;
1586 depth -= green_bits;
1587 blue_bits = depth;
1588 alpha_bits = 0;
1589 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1590 }
1591 }
1592
1593 if (alpha_flag && alpha_bits == 0)
1594 alpha_bits = 8;
1595
1596 _mesa_initialize_visual( &v->mesa_visual,
1597 rgb_flag, db_flag, stereo_flag,
1598 red_bits, green_bits,
1599 blue_bits, alpha_bits,
1600 v->mesa_visual.indexBits,
1601 depth_size,
1602 stencil_size,
1603 accum_red_size, accum_green_size,
1604 accum_blue_size, accum_alpha_size,
1605 0 );
1606
1607 /* XXX minor hack */
1608 v->mesa_visual.level = level;
1609 return v;
1610 }
1611
1612
1613 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1614 {
1615 v->display = dpy;
1616 }
1617
1618
1619 void XMesaDestroyVisual( XMesaVisual v )
1620 {
1621 #ifndef XFree86Server
1622 FREE(v->visinfo);
1623 #endif
1624 FREE(v);
1625 }
1626
1627
1628
1629 /**
1630 * Create a new XMesaContext.
1631 * \param v the XMesaVisual
1632 * \param share_list another XMesaContext with which to share display
1633 * lists or NULL if no sharing is wanted.
1634 * \return an XMesaContext or NULL if error.
1635 */
1636 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1637 {
1638 static GLboolean firstTime = GL_TRUE;
1639 XMesaContext c;
1640 GLcontext *mesaCtx;
1641 struct dd_function_table functions;
1642 TNLcontext *tnl;
1643
1644 if (firstTime) {
1645 _glthread_INIT_MUTEX(_xmesa_lock);
1646 firstTime = GL_FALSE;
1647 }
1648
1649 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1650 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1651 if (!c)
1652 return NULL;
1653
1654 mesaCtx = &(c->mesa);
1655
1656 /* initialize with default driver functions, then plug in XMesa funcs */
1657 _mesa_init_driver_functions(&functions);
1658 xmesa_init_driver_functions(v, &functions);
1659 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1660 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1661 &functions, (void *) c)) {
1662 FREE(c);
1663 return NULL;
1664 }
1665
1666 _mesa_enable_sw_extensions(mesaCtx);
1667 _mesa_enable_1_3_extensions(mesaCtx);
1668 _mesa_enable_1_4_extensions(mesaCtx);
1669 _mesa_enable_1_5_extensions(mesaCtx);
1670 _mesa_enable_2_0_extensions(mesaCtx);
1671 #if SWTC
1672 if (c->Mesa_DXTn) {
1673 _mesa_enable_extension(c, "GL_EXT_texture_compression_s3tc");
1674 _mesa_enable_extension(c, "GL_S3_s3tc");
1675 }
1676 _mesa_enable_extension(c, "GL_3DFX_texture_compression_FXT1");
1677 #endif
1678
1679 /* finish up xmesa context initializations */
1680 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1681 c->xm_visual = v;
1682 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1683 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1684 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1685 c->display = v->display;
1686 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1687
1688 /* Initialize the software rasterizer and helper modules.
1689 */
1690 if (!_swrast_CreateContext( mesaCtx ) ||
1691 !_ac_CreateContext( mesaCtx ) ||
1692 !_tnl_CreateContext( mesaCtx ) ||
1693 !_swsetup_CreateContext( mesaCtx )) {
1694 _mesa_free_context_data(&c->mesa);
1695 _mesa_free(c);
1696 return NULL;
1697 }
1698
1699 /* tnl setup */
1700 tnl = TNL_CONTEXT(mesaCtx);
1701 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1702 /* swrast setup */
1703 xmesa_register_swrast_functions( mesaCtx );
1704 _swsetup_Wakeup(mesaCtx);
1705
1706 return c;
1707 }
1708
1709
1710
1711 void XMesaDestroyContext( XMesaContext c )
1712 {
1713 GLcontext *mesaCtx = &c->mesa;
1714 #ifdef FX
1715 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1716 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1717 #endif
1718 _swsetup_DestroyContext( mesaCtx );
1719 _swrast_DestroyContext( mesaCtx );
1720 _tnl_DestroyContext( mesaCtx );
1721 _ac_DestroyContext( mesaCtx );
1722 _mesa_free_context_data( mesaCtx );
1723 _mesa_free( c );
1724 }
1725
1726
1727
1728 /*
1729 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1730 * Create a new XMesaBuffer from an X window.
1731 * Input: v - the XMesaVisual
1732 * w - the window
1733 * c - the context
1734 * Return: new XMesaBuffer or NULL if error
1735 */
1736 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1737 XMesaContext c )
1738 {
1739 #ifndef XFree86Server
1740 XWindowAttributes attr;
1741 #endif
1742 #ifdef FX
1743 char *fxEnvVar;
1744 #endif
1745 int client = 0;
1746
1747 XMesaBuffer b = alloc_xmesa_buffer();
1748 if (!b) {
1749 return NULL;
1750 }
1751
1752 (void) c;
1753
1754 #ifdef XFree86Server
1755 client = CLIENT_ID(((XMesaDrawable)w)->id);
1756 #endif
1757
1758 assert(v);
1759
1760 #ifdef XFree86Server
1761 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1762 #else
1763 XGetWindowAttributes( v->display, w, &attr );
1764
1765 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1766 #endif
1767 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1768 return NULL;
1769 }
1770
1771 b->xm_visual = v;
1772 b->type = WINDOW;
1773 b->display = v->display;
1774 #ifdef XFree86Server
1775 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1776 #else
1777 if (attr.colormap) {
1778 b->cmap = attr.colormap;
1779 }
1780 else {
1781 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1782 /* this is weird, a window w/out a colormap!? */
1783 /* OK, let's just allocate a new one and hope for the best */
1784 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1785 }
1786 #endif
1787
1788 /* determine back buffer implementation */
1789 if (v->mesa_visual.doubleBufferMode) {
1790 if (v->ximage_flag) {
1791 b->db_state = BACK_XIMAGE;
1792 }
1793 else {
1794 b->db_state = BACK_PIXMAP;
1795 }
1796 }
1797 else {
1798 b->db_state = 0;
1799 }
1800
1801 _mesa_initialize_framebuffer(&b->mesa_buffer,
1802 &v->mesa_visual,
1803 v->mesa_visual.depthBits > 0,
1804 v->mesa_visual.stencilBits > 0,
1805 v->mesa_visual.accumRedBits > 0,
1806 v->mesa_visual.alphaBits > 0 );
1807 /* XXX hack */
1808 b->mesa_buffer.UseSoftwareAuxBuffers = GL_TRUE;
1809
1810 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1811 (XMesaDrawable)w, b->cmap )) {
1812 free_xmesa_buffer(client, b);
1813 return NULL;
1814 }
1815
1816 #ifdef FX
1817 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1818 if (fxEnvVar) {
1819 if (fxEnvVar[0]!='d') {
1820 int attribs[100];
1821 int numAttribs = 0;
1822 int hw;
1823 if (v->mesa_visual.depthBits > 0) {
1824 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1825 attribs[numAttribs++] = v->mesa_visual.depthBits;
1826 }
1827 if (v->mesa_visual.doubleBufferMode) {
1828 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1829 }
1830 if (v->mesa_visual.accumRedBits > 0) {
1831 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1832 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1833 }
1834 if (v->mesa_visual.stencilBits > 0) {
1835 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1836 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1837 }
1838 if (v->mesa_visual.alphaBits > 0) {
1839 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1840 attribs[numAttribs++] = v->mesa_visual.alphaBits;
1841 }
1842 if (1) {
1843 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1844 attribs[numAttribs++] = (int) &(c->mesa);
1845 }
1846 attribs[numAttribs++] = FXMESA_NONE;
1847
1848 /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
1849 hw = fxMesaSelectCurrentBoard(0);
1850 if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
1851 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1852 if ((v->undithered_pf!=PF_Index) && (b->backimage)) {
1853 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1854 if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
1855 b->FXwindowHack = GL_TRUE;
1856 FX_grSstControl(GR_CONTROL_DEACTIVATE);
1857 }
1858 else {
1859 b->FXwindowHack = GL_FALSE;
1860 }
1861 }
1862 }
1863 else {
1864 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1865 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1866 GR_REFRESH_75Hz, attribs);
1867 else
1868 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1869 b->FXisHackUsable = GL_FALSE;
1870 b->FXwindowHack = GL_FALSE;
1871 }
1872 /*
1873 fprintf(stderr,
1874 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1875 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1876 */
1877 }
1878 }
1879 else {
1880 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1881 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1882 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1883 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1884 }
1885 #endif
1886
1887 return b;
1888 }
1889
1890
1891 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1892 {
1893 return XMesaCreateWindowBuffer2( v, w, NULL );
1894 }
1895
1896
1897 /**
1898 * Create a new XMesaBuffer from an X pixmap.
1899 *
1900 * \param v the XMesaVisual
1901 * \param p the pixmap
1902 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1903 * \c GLX_DIRECT_COLOR visual for the pixmap
1904 * \returns new XMesaBuffer or NULL if error
1905 */
1906 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1907 XMesaPixmap p, XMesaColormap cmap )
1908 {
1909 int client = 0;
1910 XMesaBuffer b = alloc_xmesa_buffer();
1911 if (!b) {
1912 return NULL;
1913 }
1914
1915
1916 #ifdef XFree86Server
1917 client = CLIENT_ID(((XMesaDrawable)p)->id);
1918 #endif
1919
1920 assert(v);
1921
1922 b->xm_visual = v;
1923 b->type = PIXMAP;
1924 b->display = v->display;
1925 b->cmap = cmap;
1926
1927 /* determine back buffer implementation */
1928 if (v->mesa_visual.doubleBufferMode) {
1929 if (v->ximage_flag) {
1930 b->db_state = BACK_XIMAGE;
1931 }
1932 else {
1933 b->db_state = BACK_PIXMAP;
1934 }
1935 }
1936 else {
1937 b->db_state = 0;
1938 }
1939
1940 _mesa_initialize_framebuffer(&b->mesa_buffer,
1941 &v->mesa_visual,
1942 v->mesa_visual.depthBits > 0,
1943 v->mesa_visual.stencilBits > 0,
1944 v->mesa_visual.accumRedBits +
1945 v->mesa_visual.accumGreenBits +
1946 v->mesa_visual.accumBlueBits > 0,
1947 v->mesa_visual.alphaBits > 0 );
1948
1949 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1950 (XMesaDrawable)p, cmap)) {
1951 free_xmesa_buffer(client, b);
1952 return NULL;
1953 }
1954
1955 return b;
1956 }
1957
1958
1959
1960 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1961 unsigned int width, unsigned int height )
1962 {
1963 #ifdef XFree86Server
1964 return 0;
1965 #else
1966 int client = 0;
1967 XMesaWindow root;
1968 XMesaDrawable drawable; /* X Pixmap Drawable */
1969 XMesaBuffer b = alloc_xmesa_buffer();
1970 if (!b) {
1971 return NULL;
1972 }
1973
1974 b->xm_visual = v;
1975 b->type = PBUFFER;
1976 b->display = v->display;
1977 b->cmap = cmap;
1978
1979 /* allocate pixmap for front buffer */
1980 root = RootWindow( v->display, v->visinfo->screen );
1981 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1982
1983 /* determine back buffer implementation */
1984 if (v->mesa_visual.doubleBufferMode) {
1985 if (v->ximage_flag) {
1986 b->db_state = BACK_XIMAGE;
1987 }
1988 else {
1989 b->db_state = BACK_PIXMAP;
1990 }
1991 }
1992 else {
1993 b->db_state = 0;
1994 }
1995
1996 _mesa_initialize_framebuffer(&b->mesa_buffer,
1997 &v->mesa_visual,
1998 v->mesa_visual.depthBits > 0,
1999 v->mesa_visual.stencilBits > 0,
2000 v->mesa_visual.accumRedBits +
2001 v->mesa_visual.accumGreenBits +
2002 v->mesa_visual.accumBlueBits > 0,
2003 v->mesa_visual.alphaBits > 0 );
2004
2005 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
2006 drawable, cmap)) {
2007 free_xmesa_buffer(client, b);
2008 return NULL;
2009 }
2010
2011 return b;
2012 #endif
2013 }
2014
2015
2016
2017 /*
2018 * Deallocate an XMesaBuffer structure and all related info.
2019 */
2020 void XMesaDestroyBuffer( XMesaBuffer b )
2021 {
2022 int client = 0;
2023
2024 #ifdef XFree86Server
2025 if (b->frontbuffer)
2026 client = CLIENT_ID(b->frontbuffer->id);
2027 #endif
2028
2029 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
2030 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
2031 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
2032
2033 if (b->backimage) {
2034 #if defined(USE_XSHM) && !defined(XFree86Server)
2035 if (b->shm) {
2036 XShmDetach( b->xm_visual->display, &b->shminfo );
2037 XDestroyImage( b->backimage );
2038 shmdt( b->shminfo.shmaddr );
2039 }
2040 else
2041 #endif
2042 XMesaDestroyImage( b->backimage );
2043 }
2044 if (b->backpixmap) {
2045 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
2046 if (b->xm_visual->hpcr_clear_flag) {
2047 XMesaFreePixmap( b->xm_visual->display,
2048 b->xm_visual->hpcr_clear_pixmap );
2049 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
2050 }
2051 }
2052 if (b->rowimage) {
2053 FREE( b->rowimage->data );
2054 b->rowimage->data = NULL;
2055 XMesaDestroyImage( b->rowimage );
2056 }
2057
2058 free_xmesa_buffer(client, b);
2059 }
2060
2061
2062
2063 /*
2064 * Bind buffer b to context c and make c the current rendering context.
2065 */
2066 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2067 {
2068 return XMesaMakeCurrent2( c, b, b );
2069 }
2070
2071
2072 /*
2073 * Bind buffer b to context c and make c the current rendering context.
2074 */
2075 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2076 XMesaBuffer readBuffer )
2077 {
2078 if (c) {
2079 if (!drawBuffer || !readBuffer)
2080 return GL_FALSE; /* must specify buffers! */
2081
2082 #ifdef FX
2083 if (drawBuffer->FXctx) {
2084 fxMesaMakeCurrent(drawBuffer->FXctx);
2085
2086 c->xm_draw_buffer = drawBuffer;
2087 c->xm_read_buffer = readBuffer;
2088 c->xm_buffer = drawBuffer;
2089
2090 return GL_TRUE;
2091 }
2092 #endif
2093 if (&(c->mesa) == _mesa_get_current_context()
2094 && c->xm_draw_buffer == drawBuffer
2095 && c->xm_read_buffer == readBuffer
2096 && c->xm_draw_buffer->wasCurrent) {
2097 /* same context and buffer, do nothing */
2098 return GL_TRUE;
2099 }
2100
2101 c->xm_draw_buffer = drawBuffer;
2102 c->xm_read_buffer = readBuffer;
2103 c->xm_buffer = drawBuffer;
2104
2105 _mesa_make_current2(&(c->mesa),
2106 &drawBuffer->mesa_buffer,
2107 &readBuffer->mesa_buffer);
2108
2109 if (c->mesa.Viewport.Width == 0) {
2110 /* initialize viewport to window size */
2111 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2112 c->mesa.Scissor.Width = drawBuffer->width;
2113 c->mesa.Scissor.Height = drawBuffer->height;
2114 }
2115
2116 if (c->xm_visual->mesa_visual.rgbMode) {
2117 /*
2118 * Must recompute and set these pixel values because colormap
2119 * can be different for different windows.
2120 */
2121 c->clearpixel = xmesa_color_to_pixel( c,
2122 c->clearcolor[0],
2123 c->clearcolor[1],
2124 c->clearcolor[2],
2125 c->clearcolor[3],
2126 c->xm_visual->undithered_pf);
2127 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2128 }
2129
2130 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2131 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2132 }
2133 else {
2134 /* Detach */
2135 _mesa_make_current2( NULL, NULL, NULL );
2136 }
2137 return GL_TRUE;
2138 }
2139
2140
2141 /*
2142 * Unbind the context c from its buffer.
2143 */
2144 GLboolean XMesaUnbindContext( XMesaContext c )
2145 {
2146 /* A no-op for XFree86 integration purposes */
2147 return GL_TRUE;
2148 }
2149
2150
2151 XMesaContext XMesaGetCurrentContext( void )
2152 {
2153 GET_CURRENT_CONTEXT(ctx);
2154 if (ctx) {
2155 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2156 return xmesa;
2157 }
2158 else {
2159 return 0;
2160 }
2161 }
2162
2163
2164 XMesaBuffer XMesaGetCurrentBuffer( void )
2165 {
2166 GET_CURRENT_CONTEXT(ctx);
2167 if (ctx) {
2168 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2169 return xmesa->xm_draw_buffer;
2170 }
2171 else {
2172 return 0;
2173 }
2174 }
2175
2176
2177 /* New in Mesa 3.1 */
2178 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2179 {
2180 GET_CURRENT_CONTEXT(ctx);
2181 if (ctx) {
2182 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2183 return xmesa->xm_read_buffer;
2184 }
2185 else {
2186 return 0;
2187 }
2188 }
2189
2190
2191 GLboolean XMesaForceCurrent(XMesaContext c)
2192 {
2193 if (c) {
2194 if (&(c->mesa) != _mesa_get_current_context()) {
2195 _mesa_make_current(&(c->mesa), &c->xm_draw_buffer->mesa_buffer);
2196 }
2197 }
2198 else {
2199 _mesa_make_current(NULL, NULL);
2200 }
2201 return GL_TRUE;
2202 }
2203
2204
2205 GLboolean XMesaLoseCurrent(XMesaContext c)
2206 {
2207 (void) c;
2208 _mesa_make_current(NULL, NULL);
2209 return GL_TRUE;
2210 }
2211
2212
2213 /*
2214 * Switch 3Dfx support hack between window and full-screen mode.
2215 */
2216 GLboolean XMesaSetFXmode( GLint mode )
2217 {
2218 #ifdef FX
2219 const char *fx = _mesa_getenv("MESA_GLX_FX");
2220 if (fx && fx[0] != 'd') {
2221 GET_CURRENT_CONTEXT(ctx);
2222 GrHwConfiguration hw;
2223 if (!FX_grSstQueryHardware(&hw)) {
2224 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2225 return GL_FALSE;
2226 }
2227 if (hw.num_sst < 1) {
2228 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2229 return GL_FALSE;
2230 }
2231 if (ctx) {
2232 /* [dBorca] Hack alert:
2233 * oh, this is sooo wrong: ctx above is
2234 * really an fxMesaContext, not an XMesaContext
2235 */
2236 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2237 if (mode == XMESA_FX_WINDOW) {
2238 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2239 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2240 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2241 return GL_TRUE;
2242 }
2243 }
2244 else if (mode == XMESA_FX_FULLSCREEN) {
2245 FX_grSstControl(GR_CONTROL_ACTIVATE);
2246 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2247 return GL_TRUE;
2248 }
2249 else {
2250 /* Error: Bad mode value */
2251 }
2252 }
2253 }
2254 /*fprintf(stderr, "fallthrough\n");*/
2255 #else
2256 (void) mode;
2257 #endif
2258 return GL_FALSE;
2259 }
2260
2261
2262
2263 #ifdef FX
2264 /*
2265 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2266 */
2267 static void FXgetImage( XMesaBuffer b )
2268 {
2269 GET_CURRENT_CONTEXT(ctx);
2270 static unsigned short pixbuf[MAX_WIDTH];
2271 GLuint x, y;
2272 int xpos, ypos;
2273 XMesaWindow root;
2274 unsigned int bw, depth, width, height;
2275 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2276
2277 #ifdef XFree86Server
2278 x = b->frontbuffer->x;
2279 y = b->frontbuffer->y;
2280 width = b->frontbuffer->width;
2281 height = b->frontbuffer->height;
2282 depth = b->frontbuffer->depth;
2283 #else
2284 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2285 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2286 #endif
2287 if (b->width != width || b->height != height) {
2288 b->width = MIN2((int)width, b->FXctx->width);
2289 b->height = MIN2((int)height, b->FXctx->height);
2290 if (b->width & 1)
2291 b->width--; /* prevent odd width */
2292 xmesa_alloc_back_buffer( b );
2293 }
2294
2295 /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
2296 /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
2297 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2298 /* Special case: 16bpp RGB */
2299 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2300 0, b->FXctx->height - b->height, /*pos*/
2301 b->width, b->height, /* size */
2302 b->width * sizeof(GLushort), /* stride */
2303 b->backimage->data); /* dest buffer */
2304 }
2305 else if (b->xm_visual->dithered_pf==PF_Dither
2306 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2307 /* Special case: 8bpp RGB */
2308 for (y=0;y<b->height;y++) {
2309 GLubyte *ptr = (GLubyte*) b->backimage->data
2310 + b->backimage->bytes_per_line * y;
2311 XDITHER_SETUP(y);
2312
2313 /* read row from 3Dfx frame buffer */
2314 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2315 0, b->FXctx->height-(b->height-y),
2316 b->width, 1,
2317 0,
2318 pixbuf );
2319
2320 /* write to XImage back buffer */
2321 for (x=0;x<b->width;x++) {
2322 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2323 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2324 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2325 *ptr++ = XDITHER( x, r, g, b);
2326 }
2327 }
2328 }
2329 else {
2330 /* General case: slow! */
2331 for (y=0;y<b->height;y++) {
2332 /* read row from 3Dfx frame buffer */
2333 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2334 0, b->FXctx->height-(b->height-y),
2335 b->width, 1,
2336 0,
2337 pixbuf );
2338
2339 /* write to XImage back buffer */
2340 for (x=0;x<b->width;x++) {
2341 XMesaPutPixel(b->backimage,x,y,
2342 xmesa_color_to_pixel(xmesa,
2343 (pixbuf[x] & 0xf800) >> 8,
2344 (pixbuf[x] & 0x07e0) >> 3,
2345 (pixbuf[x] & 0x001f) << 3,
2346 0xff,
2347 b->xm_visual->undithered_pf));
2348 }
2349 }
2350 }
2351 /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
2352 }
2353 #endif
2354
2355
2356 /*
2357 * Copy the back buffer to the front buffer. If there's no back buffer
2358 * this is a no-op.
2359 */
2360 void XMesaSwapBuffers( XMesaBuffer b )
2361 {
2362 GET_CURRENT_CONTEXT(ctx);
2363
2364 /* If we're swapping the buffer associated with the current context
2365 * we have to flush any pending rendering commands first.
2366 */
2367 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2368 _mesa_notifySwapBuffers(ctx);
2369
2370 if (b->db_state) {
2371 #ifdef FX
2372 if (b->FXctx) {
2373 fxMesaSwapBuffers();
2374
2375 if (b->FXwindowHack)
2376 FXgetImage(b);
2377 else
2378 return;
2379 }
2380 #endif
2381 if (b->backimage) {
2382 /* Copy Ximage from host's memory to server's window */
2383 #if defined(USE_XSHM) && !defined(XFree86Server)
2384 if (b->shm) {
2385 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2386 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2387 b->swapgc,
2388 b->backimage, 0, 0,
2389 0, 0, b->width, b->height, False );
2390 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2391 }
2392 else
2393 #endif
2394 {
2395 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2396 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2397 b->swapgc,
2398 b->backimage, 0, 0,
2399 0, 0, b->width, b->height );
2400 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2401 }
2402 }
2403 else {
2404 /* Copy pixmap to window on server */
2405 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2406 XMesaCopyArea( b->xm_visual->display,
2407 b->backpixmap, /* source drawable */
2408 b->frontbuffer, /* dest. drawable */
2409 b->swapgc,
2410 0, 0, b->width, b->height, /* source region */
2411 0, 0 /* dest region */
2412 );
2413 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2414 }
2415 }
2416 #if !defined(XFree86Server)
2417 XSync( b->xm_visual->display, False );
2418 #endif
2419 }
2420
2421
2422
2423 /*
2424 * Copy sub-region of back buffer to front buffer
2425 */
2426 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2427 {
2428 GET_CURRENT_CONTEXT(ctx);
2429
2430 /* If we're swapping the buffer associated with the current context
2431 * we have to flush any pending rendering commands first.
2432 */
2433 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2434 _mesa_notifySwapBuffers(ctx);
2435
2436 if (b->db_state) {
2437 int yTop = b->height - y - height;
2438 #ifdef FX
2439 if (b->FXctx) {
2440 fxMesaSwapBuffers();
2441 if (b->FXwindowHack)
2442 FXgetImage(b);
2443 else
2444 return;
2445 }
2446 #endif
2447 if (b->backimage) {
2448 /* Copy Ximage from host's memory to server's window */
2449 #if defined(USE_XSHM) && !defined(XFree86Server)
2450 if (b->shm) {
2451 /* XXX assuming width and height aren't too large! */
2452 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2453 b->swapgc,
2454 b->backimage, x, yTop,
2455 x, yTop, width, height, False );
2456 /* wait for finished event??? */
2457 }
2458 else
2459 #endif
2460 {
2461 /* XXX assuming width and height aren't too large! */
2462 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2463 b->swapgc,
2464 b->backimage, x, yTop,
2465 x, yTop, width, height );
2466 }
2467 }
2468 else {
2469 /* Copy pixmap to window on server */
2470 XMesaCopyArea( b->xm_visual->display,
2471 b->backpixmap, /* source drawable */
2472 b->frontbuffer, /* dest. drawable */
2473 b->swapgc,
2474 x, yTop, width, height, /* source region */
2475 x, yTop /* dest region */
2476 );
2477 }
2478 }
2479 }
2480
2481
2482 /*
2483 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2484 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2485 * back buffer directly.
2486 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2487 * ximage - pointer to back buffer's XImage, or NULL
2488 * Return: GL_TRUE = context is double buffered
2489 * GL_FALSE = context is single buffered
2490 */
2491 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2492 XMesaPixmap *pixmap,
2493 XMesaImage **ximage )
2494 {
2495 if (b->db_state) {
2496 if (pixmap) *pixmap = b->backpixmap;
2497 if (ximage) *ximage = b->backimage;
2498 return GL_TRUE;
2499 }
2500 else {
2501 *pixmap = 0;
2502 *ximage = NULL;
2503 return GL_FALSE;
2504 }
2505 }
2506
2507
2508 /*
2509 * Return the depth buffer associated with an XMesaBuffer.
2510 * Input: b - the XMesa buffer handle
2511 * Output: width, height - size of buffer in pixels
2512 * bytesPerValue - bytes per depth value (2 or 4)
2513 * buffer - pointer to depth buffer values
2514 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2515 */
2516 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2517 GLint *bytesPerValue, void **buffer )
2518 {
2519 if (!b->mesa_buffer.DepthBuffer) {
2520 *width = 0;
2521 *height = 0;
2522 *bytesPerValue = 0;
2523 *buffer = 0;
2524 return GL_FALSE;
2525 }
2526 else {
2527 *width = b->mesa_buffer.Width;
2528 *height = b->mesa_buffer.Height;
2529 *bytesPerValue = sizeof(GLdepth);
2530 *buffer = b->mesa_buffer.DepthBuffer;
2531 return GL_TRUE;
2532 }
2533 }
2534
2535
2536 void XMesaFlush( XMesaContext c )
2537 {
2538 if (c && c->xm_visual) {
2539 #ifdef XFree86Server
2540 /* NOT_NEEDED */
2541 #else
2542 XSync( c->xm_visual->display, False );
2543 #endif
2544 }
2545 }
2546
2547
2548
2549 const char *XMesaGetString( XMesaContext c, int name )
2550 {
2551 (void) c;
2552 if (name==XMESA_VERSION) {
2553 return "5.0";
2554 }
2555 else if (name==XMESA_EXTENSIONS) {
2556 return "";
2557 }
2558 else {
2559 return NULL;
2560 }
2561 }
2562
2563
2564
2565 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2566 {
2567 XMesaBuffer b;
2568 for (b=XMesaBufferList; b; b=b->Next) {
2569 if (b->frontbuffer==d && b->display==dpy) {
2570 return b;
2571 }
2572 }
2573 return NULL;
2574 }
2575
2576
2577
2578 /*
2579 * Look for XMesaBuffers whose X window has been destroyed.
2580 * Deallocate any such XMesaBuffers.
2581 */
2582 void XMesaGarbageCollect( void )
2583 {
2584 XMesaBuffer b, next;
2585 for (b=XMesaBufferList; b; b=next) {
2586 next = b->Next;
2587 if (b->display && b->frontbuffer && b->type == WINDOW) {
2588 #ifdef XFree86Server
2589 /* NOT_NEEDED */
2590 #else
2591 XSync(b->display, False);
2592 if (!window_exists( b->display, b->frontbuffer )) {
2593 /* found a dead window, free the ancillary info */
2594 XMesaDestroyBuffer( b );
2595 }
2596 #endif
2597 }
2598 }
2599 }
2600
2601
2602 void XMesaReset( void )
2603 {
2604 while (XMesaBufferList)
2605 XMesaDestroyBuffer(XMesaBufferList);
2606
2607 XMesaBufferList = NULL;
2608 }
2609
2610
2611 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2612 GLfloat red, GLfloat green,
2613 GLfloat blue, GLfloat alpha )
2614 {
2615 GLint r = (GLint) (red * 255.0F);
2616 GLint g = (GLint) (green * 255.0F);
2617 GLint b = (GLint) (blue * 255.0F);
2618 GLint a = (GLint) (alpha * 255.0F);
2619
2620 switch (xmesa->pixelformat) {
2621 case PF_Index:
2622 return 0;
2623 case PF_Truecolor:
2624 {
2625 unsigned long p;
2626 PACK_TRUECOLOR( p, r, g, b );
2627 return p;
2628 }
2629 case PF_8A8B8G8R:
2630 return PACK_8A8B8G8R( r, g, b, a );
2631 case PF_8R8G8B:
2632 return PACK_8R8G8B( r, g, b );
2633 case PF_5R6G5B:
2634 return PACK_5R6G5B( r, g, b );
2635 case PF_Dither:
2636 {
2637 DITHER_SETUP;
2638 return DITHER( x, y, r, g, b );
2639 }
2640 case PF_1Bit:
2641 /* 382 = (3*255)/2 */
2642 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2643 case PF_HPCR:
2644 return DITHER_HPCR(x, y, r, g, b);
2645 case PF_Lookup:
2646 {
2647 LOOKUP_SETUP;
2648 return LOOKUP( r, g, b );
2649 }
2650 case PF_Grayscale:
2651 return GRAY_RGB( r, g, b );
2652 case PF_Dither_5R6G5B:
2653 /* fall through */
2654 case PF_Dither_True:
2655 {
2656 unsigned long p;
2657 PACK_TRUEDITHER(p, x, y, r, g, b);
2658 return p;
2659 }
2660 default:
2661 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2662 }
2663 return 0;
2664 }
2665
2666
2667 /*
2668 * This is typically called when the window size changes and we need
2669 * to reallocate the buffer's back/depth/stencil/accum buffers.
2670 */
2671 void XMesaResizeBuffers( XMesaBuffer b )
2672 {
2673 xmesa_resize_buffers( &(b->mesa_buffer) );
2674
2675 }
2676