1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.1
4 *
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file xm_api.c
27 *
28 * All the XMesa* API functions.
29 *
30 *
31 * NOTES:
32 *
33 * The window coordinate system origin (0,0) is in the lower-left corner
34 * of the window. X11's window coordinate origin is in the upper-left
35 * corner of the window. Therefore, most drawing functions in this
36 * file have to flip Y coordinates.
37 *
38 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
39 * in support for the MIT Shared Memory extension. If enabled, when you
40 * use an Ximage for the back buffer in double buffered mode, the "swap"
41 * operation will be faster. You must also link with -lXext.
42 *
43 * Byte swapping: If the Mesa host and the X display use a different
44 * byte order then there's some trickiness to be aware of when using
45 * XImages. The byte ordering used for the XImage is that of the X
46 * display, not the Mesa host.
47 * The color-to-pixel encoding for True/DirectColor must be done
48 * according to the display's visual red_mask, green_mask, and blue_mask.
49 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
50 * do byte swapping if needed. If one wants to directly "poke" the pixel
51 * into the XImage's buffer then the pixel must be byte swapped first. In
52 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
53 * and use XPutPixel everywhere except in the implementation of
54 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
55 * instead of using XPutPixel we "poke" our values after byte-swapping
56 * the clear pixel value if needed.
57 *
58 */
59
60 #ifdef __CYGWIN__
61 #undef WIN32
62 #undef __WIN32__
63 #endif
64
65 #include "glxheader.h"
66 #include "xmesaP.h"
67 #include "main/context.h"
68 #include "main/extensions.h"
69 #include "main/framebuffer.h"
70 #include "main/imports.h"
71 #include "main/macros.h"
72 #include "main/renderbuffer.h"
73 #include "main/teximage.h"
74 #include "glapi/glthread.h"
75 #include "swrast/swrast.h"
76 #include "swrast/s_renderbuffer.h"
77 #include "swrast_setup/swrast_setup.h"
78 #include "vbo/vbo.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 #include "drivers/common/meta.h"
84
85 /**
86 * Global X driver lock
87 */
88 _glthread_Mutex _xmesa_lock;
89
90
91
92 /**********************************************************************/
93 /***** X Utility Functions *****/
94 /**********************************************************************/
95
96
97 /**
98 * Return the host's byte order as LSBFirst or MSBFirst ala X.
99 */
host_byte_order(void)100 static int host_byte_order( void )
101 {
102 int i = 1;
103 char *cptr = (char *) &i;
104 return (*cptr==1) ? LSBFirst : MSBFirst;
105 }
106
107
108 /**
109 * Check if the X Shared Memory extension is available.
110 * Return: 0 = not available
111 * 1 = shared XImage support available
112 * 2 = shared Pixmap support available also
113 */
check_for_xshm(XMesaDisplay * display)114 static int check_for_xshm( XMesaDisplay *display )
115 {
116 #if defined(USE_XSHM)
117 int ignore;
118
119 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
120 /* Note: we're no longer calling XShmQueryVersion() here. It seems
121 * to be flakey (triggers a spurious X protocol error when we close
122 * one display connection and start using a new one. XShm has been
123 * around a long time and hasn't changed so if MIT_SHM is supported
124 * we assume we're good to go.
125 */
126 return 2;
127 }
128 else {
129 return 0;
130 }
131 #else
132 /* No XSHM support */
133 return 0;
134 #endif
135 }
136
137
138 /**
139 * Apply gamma correction to an intensity value in [0..max]. Return the
140 * new intensity value.
141 */
142 static GLint
gamma_adjust(GLfloat gamma,GLint value,GLint max)143 gamma_adjust( GLfloat gamma, GLint value, GLint max )
144 {
145 if (gamma == 1.0) {
146 return value;
147 }
148 else {
149 double x = (double) value / (double) max;
150 return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
151 }
152 }
153
154
155
156 /**
157 * Return the true number of bits per pixel for XImages.
158 * For example, if we request a 24-bit deep visual we may actually need/get
159 * 32bpp XImages. This function returns the appropriate bpp.
160 * Input: dpy - the X display
161 * visinfo - desribes the visual to be used for XImages
162 * Return: true number of bits per pixel for XImages
163 */
164 static int
bits_per_pixel(XMesaVisual xmv)165 bits_per_pixel( XMesaVisual xmv )
166 {
167 XMesaDisplay *dpy = xmv->display;
168 XMesaVisualInfo visinfo = xmv->visinfo;
169 XMesaImage *img;
170 int bitsPerPixel;
171 /* Create a temporary XImage */
172 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
173 ZPixmap, 0, /*format, offset*/
174 (char*) MALLOC(8), /*data*/
175 1, 1, /*width, height*/
176 32, /*bitmap_pad*/
177 0 /*bytes_per_line*/
178 );
179 assert(img);
180 /* grab the bits/pixel value */
181 bitsPerPixel = img->bits_per_pixel;
182 /* free the XImage */
183 free( img->data );
184 img->data = NULL;
185 XMesaDestroyImage( img );
186 return bitsPerPixel;
187 }
188
189
190
191 /*
192 * Determine if a given X window ID is valid (window exists).
193 * Do this by calling XGetWindowAttributes() for the window and
194 * checking if we catch an X error.
195 * Input: dpy - the display
196 * win - the window to check for existance
197 * Return: GL_TRUE - window exists
198 * GL_FALSE - window doesn't exist
199 */
200 static GLboolean WindowExistsFlag;
201
window_exists_err_handler(XMesaDisplay * dpy,XErrorEvent * xerr)202 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
203 {
204 (void) dpy;
205 if (xerr->error_code == BadWindow) {
206 WindowExistsFlag = GL_FALSE;
207 }
208 return 0;
209 }
210
window_exists(XMesaDisplay * dpy,Window win)211 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
212 {
213 XWindowAttributes wa;
214 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
215 WindowExistsFlag = GL_TRUE;
216 old_handler = XSetErrorHandler(window_exists_err_handler);
217 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
218 XSetErrorHandler(old_handler);
219 return WindowExistsFlag;
220 }
221
222 static Status
get_drawable_size(XMesaDisplay * dpy,Drawable d,GLuint * width,GLuint * height)223 get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
224 {
225 Window root;
226 Status stat;
227 int xpos, ypos;
228 unsigned int w, h, bw, depth;
229 stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
230 *width = w;
231 *height = h;
232 return stat;
233 }
234
235
236 /**
237 * Return the size of the window (or pixmap) that corresponds to the
238 * given XMesaBuffer.
239 * \param width returns width in pixels
240 * \param height returns height in pixels
241 */
242 void
xmesa_get_window_size(XMesaDisplay * dpy,XMesaBuffer b,GLuint * width,GLuint * height)243 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
244 GLuint *width, GLuint *height)
245 {
246 Status stat;
247
248 _glthread_LOCK_MUTEX(_xmesa_lock);
249 XSync(b->xm_visual->display, 0); /* added for Chromium */
250 stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
251 _glthread_UNLOCK_MUTEX(_xmesa_lock);
252
253 if (!stat) {
254 /* probably querying a window that's recently been destroyed */
255 _mesa_warning(NULL, "XGetGeometry failed!\n");
256 *width = *height = 1;
257 }
258 }
259
260
261
262 /**********************************************************************/
263 /***** Linked list of XMesaBuffers *****/
264 /**********************************************************************/
265
266 XMesaBuffer XMesaBufferList = NULL;
267
268
269 /**
270 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
271 * Note that XMesaBuffer is derived from struct gl_framebuffer.
272 * The new XMesaBuffer will not have any size (Width=Height=0).
273 *
274 * \param d the corresponding X drawable (window or pixmap)
275 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
276 * \param vis the buffer's visual
277 * \param cmap the window's colormap, if known.
278 * \return new XMesaBuffer or NULL if any problem
279 */
280 static XMesaBuffer
create_xmesa_buffer(XMesaDrawable d,BufferType type,XMesaVisual vis,XMesaColormap cmap)281 create_xmesa_buffer(XMesaDrawable d, BufferType type,
282 XMesaVisual vis, XMesaColormap cmap)
283 {
284 XMesaBuffer b;
285
286 ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
287
288 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
289 if (!b)
290 return NULL;
291
292 b->display = vis->display;
293 b->xm_visual = vis;
294 b->type = type;
295 b->cmap = cmap;
296
297 _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
298 b->mesa_buffer.Delete = xmesa_delete_framebuffer;
299
300 /*
301 * Front renderbuffer
302 */
303 b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
304 if (!b->frontxrb) {
305 free(b);
306 return NULL;
307 }
308 b->frontxrb->Parent = b;
309 b->frontxrb->drawable = d;
310 b->frontxrb->pixmap = (XMesaPixmap) d;
311 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
312 &b->frontxrb->Base.Base);
313
314 /*
315 * Back renderbuffer
316 */
317 if (vis->mesa_visual.doubleBufferMode) {
318 b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
319 if (!b->backxrb) {
320 /* XXX free front xrb too */
321 free(b);
322 return NULL;
323 }
324 b->backxrb->Parent = b;
325 /* determine back buffer implementation */
326 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
327
328 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
329 &b->backxrb->Base.Base);
330 }
331
332 /*
333 * Other renderbuffer (depth, stencil, etc)
334 */
335 _swrast_add_soft_renderbuffers(&b->mesa_buffer,
336 GL_FALSE, /* color */
337 vis->mesa_visual.haveDepthBuffer,
338 vis->mesa_visual.haveStencilBuffer,
339 vis->mesa_visual.haveAccumBuffer,
340 GL_FALSE, /* software alpha buffer */
341 vis->mesa_visual.numAuxBuffers > 0 );
342
343 /* GLX_EXT_texture_from_pixmap */
344 b->TextureTarget = 0;
345 b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
346 b->TextureMipmap = 0;
347
348 /* insert buffer into linked list */
349 b->Next = XMesaBufferList;
350 XMesaBufferList = b;
351
352 return b;
353 }
354
355
356 /**
357 * Find an XMesaBuffer by matching X display and colormap but NOT matching
358 * the notThis buffer.
359 */
360 XMesaBuffer
xmesa_find_buffer(XMesaDisplay * dpy,XMesaColormap cmap,XMesaBuffer notThis)361 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
362 {
363 XMesaBuffer b;
364 for (b=XMesaBufferList; b; b=b->Next) {
365 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
366 return b;
367 }
368 }
369 return NULL;
370 }
371
372
373 /**
374 * Remove buffer from linked list, delete if no longer referenced.
375 */
376 static void
xmesa_free_buffer(XMesaBuffer buffer)377 xmesa_free_buffer(XMesaBuffer buffer)
378 {
379 XMesaBuffer prev = NULL, b;
380
381 for (b = XMesaBufferList; b; b = b->Next) {
382 if (b == buffer) {
383 struct gl_framebuffer *fb = &buffer->mesa_buffer;
384
385 /* unlink buffer from list */
386 if (prev)
387 prev->Next = buffer->Next;
388 else
389 XMesaBufferList = buffer->Next;
390
391 /* mark as delete pending */
392 fb->DeletePending = GL_TRUE;
393
394 /* Since the X window for the XMesaBuffer is going away, we don't
395 * want to dereference this pointer in the future.
396 */
397 b->frontxrb->drawable = 0;
398
399 /* Unreference. If count = zero we'll really delete the buffer */
400 _mesa_reference_framebuffer(&fb, NULL);
401
402 return;
403 }
404 /* continue search */
405 prev = b;
406 }
407 /* buffer not found in XMesaBufferList */
408 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
409 }
410
411
412
413
414 /**********************************************************************/
415 /***** Misc Private Functions *****/
416 /**********************************************************************/
417
418
419 /**
420 * Setup RGB rendering for a window with a True/DirectColor visual.
421 */
422 static void
setup_truecolor(XMesaVisual v,XMesaBuffer buffer,XMesaColormap cmap)423 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
424 {
425 unsigned long rmask, gmask, bmask;
426 (void) buffer;
427 (void) cmap;
428
429 /* Compute red multiplier (mask) and bit shift */
430 v->rshift = 0;
431 rmask = GET_REDMASK(v);
432 while ((rmask & 1)==0) {
433 v->rshift++;
434 rmask = rmask >> 1;
435 }
436
437 /* Compute green multiplier (mask) and bit shift */
438 v->gshift = 0;
439 gmask = GET_GREENMASK(v);
440 while ((gmask & 1)==0) {
441 v->gshift++;
442 gmask = gmask >> 1;
443 }
444
445 /* Compute blue multiplier (mask) and bit shift */
446 v->bshift = 0;
447 bmask = GET_BLUEMASK(v);
448 while ((bmask & 1)==0) {
449 v->bshift++;
450 bmask = bmask >> 1;
451 }
452
453 /*
454 * Compute component-to-pixel lookup tables and dithering kernel
455 */
456 {
457 static GLubyte kernel[16] = {
458 0*16, 8*16, 2*16, 10*16,
459 12*16, 4*16, 14*16, 6*16,
460 3*16, 11*16, 1*16, 9*16,
461 15*16, 7*16, 13*16, 5*16,
462 };
463 GLint rBits = _mesa_bitcount(rmask);
464 GLint gBits = _mesa_bitcount(gmask);
465 GLint bBits = _mesa_bitcount(bmask);
466 GLint maxBits;
467 GLuint i;
468
469 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
470 for (i=0; i<=rmask; i++)
471 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
472 for (i=0; i<=gmask; i++)
473 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
474 for (i=0; i<=bmask; i++)
475 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
476
477 /* convert RGB values from [0,255] to pixel components */
478
479 for (i=0;i<256;i++) {
480 GLint r = gamma_adjust(v->RedGamma, i, 255);
481 GLint g = gamma_adjust(v->GreenGamma, i, 255);
482 GLint b = gamma_adjust(v->BlueGamma, i, 255);
483 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
484 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
485 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
486 }
487 /* overflow protection */
488 for (i=256;i<512;i++) {
489 v->RtoPixel[i] = v->RtoPixel[255];
490 v->GtoPixel[i] = v->GtoPixel[255];
491 v->BtoPixel[i] = v->BtoPixel[255];
492 }
493
494 /* setup dithering kernel */
495 maxBits = rBits;
496 if (gBits > maxBits) maxBits = gBits;
497 if (bBits > maxBits) maxBits = bBits;
498 for (i=0;i<16;i++) {
499 v->Kernel[i] = kernel[i] >> maxBits;
500 }
501
502 v->undithered_pf = PF_Truecolor;
503 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
504 }
505
506 /*
507 * Now check for TrueColor visuals which we can optimize.
508 */
509 if ( GET_REDMASK(v) ==0x0000ff
510 && GET_GREENMASK(v)==0x00ff00
511 && GET_BLUEMASK(v) ==0xff0000
512 && CHECK_BYTE_ORDER(v)
513 && v->BitsPerPixel==32
514 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
515 /* common 32 bpp config used on SGI, Sun */
516 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
517 }
518 else if (GET_REDMASK(v) == 0xff0000
519 && GET_GREENMASK(v)== 0x00ff00
520 && GET_BLUEMASK(v) == 0x0000ff
521 && CHECK_BYTE_ORDER(v)
522 && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
523 if (v->BitsPerPixel==32) {
524 /* if 32 bpp, and visual indicates 8 bpp alpha channel */
525 if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
526 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
527 else
528 v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
529 }
530 else if (v->BitsPerPixel == 24) {
531 v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
532 }
533 }
534 else if (GET_REDMASK(v) ==0xf800
535 && GET_GREENMASK(v)==0x07e0
536 && GET_BLUEMASK(v) ==0x001f
537 && CHECK_BYTE_ORDER(v)
538 && v->BitsPerPixel==16
539 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
540 /* 5-6-5 RGB */
541 v->undithered_pf = PF_5R6G5B;
542 v->dithered_pf = PF_Dither_5R6G5B;
543 }
544 }
545
546
547 /**
548 * When a context is bound for the first time, we can finally finish
549 * initializing the context's visual and buffer information.
550 * \param v the XMesaVisual to initialize
551 * \param b the XMesaBuffer to initialize (may be NULL)
552 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
553 * \param window the window/pixmap we're rendering into
554 * \param cmap the colormap associated with the window/pixmap
555 * \return GL_TRUE=success, GL_FALSE=failure
556 */
557 static GLboolean
initialize_visual_and_buffer(XMesaVisual v,XMesaBuffer b,XMesaDrawable window,XMesaColormap cmap)558 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
559 XMesaDrawable window,
560 XMesaColormap cmap)
561 {
562 const int xclass = v->visualType;
563
564
565 ASSERT(!b || b->xm_visual == v);
566
567 /* Save true bits/pixel */
568 v->BitsPerPixel = bits_per_pixel(v);
569 assert(v->BitsPerPixel > 0);
570
571 /* RGB WINDOW:
572 * We support RGB rendering into almost any kind of visual.
573 */
574 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
575 setup_truecolor( v, b, cmap );
576 }
577 else {
578 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
579 return GL_FALSE;
580 }
581 v->mesa_visual.indexBits = 0;
582
583 if (_mesa_getenv("MESA_NO_DITHER")) {
584 v->dithered_pf = v->undithered_pf;
585 }
586
587
588 /*
589 * If MESA_INFO env var is set print out some debugging info
590 * which can help Brian figure out what's going on when a user
591 * reports bugs.
592 */
593 if (_mesa_getenv("MESA_INFO")) {
594 printf("X/Mesa visual = %p\n", (void *) v);
595 printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
596 printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
597 printf("X/Mesa level = %d\n", v->mesa_visual.level);
598 printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
599 printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
600 }
601
602 if (b && window) {
603 /* Do window-specific initializations */
604
605 /* these should have been set in create_xmesa_buffer */
606 ASSERT(b->frontxrb->drawable == window);
607 ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
608
609 /* Setup for single/double buffering */
610 if (v->mesa_visual.doubleBufferMode) {
611 /* Double buffered */
612 b->shm = check_for_xshm( v->display );
613 }
614
615 /* X11 graphics contexts */
616 b->gc = XCreateGC( v->display, window, 0, NULL );
617 XMesaSetFunction( v->display, b->gc, GXcopy );
618
619 /* cleargc - for glClear() */
620 b->cleargc = XCreateGC( v->display, window, 0, NULL );
621 XMesaSetFunction( v->display, b->cleargc, GXcopy );
622
623 /*
624 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
625 * Patch contributed by Michael Pichler May 15, 1995.
626 */
627 {
628 XGCValues gcvalues;
629 gcvalues.graphics_exposures = False;
630 b->swapgc = XCreateGC(v->display, window,
631 GCGraphicsExposures, &gcvalues);
632 }
633 XMesaSetFunction( v->display, b->swapgc, GXcopy );
634 }
635
636 return GL_TRUE;
637 }
638
639
640
641 /*
642 * Convert an RGBA color to a pixel value.
643 */
644 unsigned long
xmesa_color_to_pixel(struct gl_context * ctx,GLubyte r,GLubyte g,GLubyte b,GLubyte a,GLuint pixelFormat)645 xmesa_color_to_pixel(struct gl_context *ctx,
646 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
647 GLuint pixelFormat)
648 {
649 XMesaContext xmesa = XMESA_CONTEXT(ctx);
650 switch (pixelFormat) {
651 case PF_Truecolor:
652 {
653 unsigned long p;
654 PACK_TRUECOLOR( p, r, g, b );
655 return p;
656 }
657 case PF_8A8B8G8R:
658 return PACK_8A8B8G8R( r, g, b, a );
659 case PF_8A8R8G8B:
660 return PACK_8A8R8G8B( r, g, b, a );
661 case PF_8R8G8B:
662 /* fall through */
663 case PF_8R8G8B24:
664 return PACK_8R8G8B( r, g, b );
665 case PF_5R6G5B:
666 return PACK_5R6G5B( r, g, b );
667 case PF_Dither_True:
668 /* fall through */
669 case PF_Dither_5R6G5B:
670 {
671 unsigned long p;
672 PACK_TRUEDITHER(p, 1, 0, r, g, b);
673 return p;
674 }
675 default:
676 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
677 }
678 return 0;
679 }
680
681
682 #define NUM_VISUAL_TYPES 6
683
684 /**
685 * Convert an X visual type to a GLX visual type.
686 *
687 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
688 * to be converted.
689 * \return If \c visualType is a valid X visual type, a GLX visual type will
690 * be returned. Otherwise \c GLX_NONE will be returned.
691 *
692 * \note
693 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
694 * DRI CVS tree.
695 */
696 static GLint
xmesa_convert_from_x_visual_type(int visualType)697 xmesa_convert_from_x_visual_type( int visualType )
698 {
699 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
700 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
701 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
702 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
703 };
704
705 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
706 ? glx_visual_types[ visualType ] : GLX_NONE;
707 }
708
709
710 /**********************************************************************/
711 /***** Public Functions *****/
712 /**********************************************************************/
713
714
715 /*
716 * Create a new X/Mesa visual.
717 * Input: display - X11 display
718 * visinfo - an XVisualInfo pointer
719 * rgb_flag - GL_TRUE = RGB mode,
720 * GL_FALSE = color index mode
721 * alpha_flag - alpha buffer requested?
722 * db_flag - GL_TRUE = double-buffered,
723 * GL_FALSE = single buffered
724 * stereo_flag - stereo visual?
725 * ximage_flag - GL_TRUE = use an XImage for back buffer,
726 * GL_FALSE = use an off-screen pixmap for back buffer
727 * depth_size - requested bits/depth values, or zero
728 * stencil_size - requested bits/stencil values, or zero
729 * accum_red_size - requested bits/red accum values, or zero
730 * accum_green_size - requested bits/green accum values, or zero
731 * accum_blue_size - requested bits/blue accum values, or zero
732 * accum_alpha_size - requested bits/alpha accum values, or zero
733 * num_samples - number of samples/pixel if multisampling, or zero
734 * level - visual level, usually 0
735 * visualCaveat - ala the GLX extension, usually GLX_NONE
736 * Return; a new XMesaVisual or 0 if error.
737 */
738 PUBLIC
XMesaCreateVisual(XMesaDisplay * display,XMesaVisualInfo visinfo,GLboolean rgb_flag,GLboolean alpha_flag,GLboolean db_flag,GLboolean stereo_flag,GLboolean ximage_flag,GLint depth_size,GLint stencil_size,GLint accum_red_size,GLint accum_green_size,GLint accum_blue_size,GLint accum_alpha_size,GLint num_samples,GLint level,GLint visualCaveat)739 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
740 XMesaVisualInfo visinfo,
741 GLboolean rgb_flag,
742 GLboolean alpha_flag,
743 GLboolean db_flag,
744 GLboolean stereo_flag,
745 GLboolean ximage_flag,
746 GLint depth_size,
747 GLint stencil_size,
748 GLint accum_red_size,
749 GLint accum_green_size,
750 GLint accum_blue_size,
751 GLint accum_alpha_size,
752 GLint num_samples,
753 GLint level,
754 GLint visualCaveat )
755 {
756 char *gamma;
757 XMesaVisual v;
758 GLint red_bits, green_bits, blue_bits, alpha_bits;
759
760 /* For debugging only */
761 if (_mesa_getenv("MESA_XSYNC")) {
762 /* This makes debugging X easier.
763 * In your debugger, set a breakpoint on _XError to stop when an
764 * X protocol error is generated.
765 */
766 XSynchronize( display, 1 );
767 }
768
769 /* Color-index rendering not supported. */
770 if (!rgb_flag)
771 return NULL;
772
773 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
774 if (!v) {
775 return NULL;
776 }
777
778 v->display = display;
779
780 /* Save a copy of the XVisualInfo struct because the user may Xfree()
781 * the struct but we may need some of the information contained in it
782 * at a later time.
783 */
784 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
785 if(!v->visinfo) {
786 free(v);
787 return NULL;
788 }
789 memcpy(v->visinfo, visinfo, sizeof(*visinfo));
790
791 /* check for MESA_GAMMA environment variable */
792 gamma = _mesa_getenv("MESA_GAMMA");
793 if (gamma) {
794 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
795 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
796 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
797 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
798 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
799 }
800 else {
801 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
802 }
803
804 v->ximage_flag = ximage_flag;
805
806 v->mesa_visual.redMask = visinfo->red_mask;
807 v->mesa_visual.greenMask = visinfo->green_mask;
808 v->mesa_visual.blueMask = visinfo->blue_mask;
809 v->visualID = visinfo->visualid;
810 v->screen = visinfo->screen;
811
812 #if !(defined(__cplusplus) || defined(c_plusplus))
813 v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
814 #else
815 v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
816 #endif
817
818 v->mesa_visual.visualRating = visualCaveat;
819
820 if (alpha_flag)
821 v->mesa_visual.alphaBits = 8;
822
823 (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
824
825 {
826 const int xclass = v->visualType;
827 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
828 red_bits = _mesa_bitcount(GET_REDMASK(v));
829 green_bits = _mesa_bitcount(GET_GREENMASK(v));
830 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
831 }
832 else {
833 /* this is an approximation */
834 int depth;
835 depth = GET_VISUAL_DEPTH(v);
836 red_bits = depth / 3;
837 depth -= red_bits;
838 green_bits = depth / 2;
839 depth -= green_bits;
840 blue_bits = depth;
841 alpha_bits = 0;
842 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
843 }
844 alpha_bits = v->mesa_visual.alphaBits;
845 }
846
847 if (!_mesa_initialize_visual(&v->mesa_visual,
848 db_flag, stereo_flag,
849 red_bits, green_bits,
850 blue_bits, alpha_bits,
851 depth_size,
852 stencil_size,
853 accum_red_size, accum_green_size,
854 accum_blue_size, accum_alpha_size,
855 0)) {
856 FREE(v);
857 return NULL;
858 }
859
860 /* XXX minor hack */
861 v->mesa_visual.level = level;
862 return v;
863 }
864
865
866 PUBLIC
XMesaDestroyVisual(XMesaVisual v)867 void XMesaDestroyVisual( XMesaVisual v )
868 {
869 free(v->visinfo);
870 free(v);
871 }
872
873
874
875 /**
876 * Create a new XMesaContext.
877 * \param v the XMesaVisual
878 * \param share_list another XMesaContext with which to share display
879 * lists or NULL if no sharing is wanted.
880 * \return an XMesaContext or NULL if error.
881 */
882 PUBLIC
XMesaCreateContext(XMesaVisual v,XMesaContext share_list)883 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
884 {
885 static GLboolean firstTime = GL_TRUE;
886 XMesaContext c;
887 struct gl_context *mesaCtx;
888 struct dd_function_table functions;
889 TNLcontext *tnl;
890
891 if (firstTime) {
892 _glthread_INIT_MUTEX(_xmesa_lock);
893 firstTime = GL_FALSE;
894 }
895
896 /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
897 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
898 if (!c)
899 return NULL;
900
901 mesaCtx = &(c->mesa);
902
903 /* initialize with default driver functions, then plug in XMesa funcs */
904 _mesa_init_driver_functions(&functions);
905 xmesa_init_driver_functions(v, &functions);
906 if (!_mesa_initialize_context(mesaCtx, API_OPENGL, &v->mesa_visual,
907 share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
908 &functions, (void *) c)) {
909 free(c);
910 return NULL;
911 }
912
913 /* Enable this to exercise fixed function -> shader translation
914 * with software rendering.
915 */
916 if (0) {
917 mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
918 mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
919 }
920
921 _mesa_enable_sw_extensions(mesaCtx);
922 _mesa_enable_1_3_extensions(mesaCtx);
923 _mesa_enable_1_4_extensions(mesaCtx);
924 _mesa_enable_1_5_extensions(mesaCtx);
925 _mesa_enable_2_0_extensions(mesaCtx);
926 _mesa_enable_2_1_extensions(mesaCtx);
927 if (mesaCtx->Mesa_DXTn) {
928 _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
929 _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
930 }
931 _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
932 #if ENABLE_EXT_timer_query
933 _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
934 #endif
935
936
937 /* finish up xmesa context initializations */
938 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
939 c->xm_visual = v;
940 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
941 c->display = v->display;
942 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
943
944 /* Initialize the software rasterizer and helper modules.
945 */
946 if (!_swrast_CreateContext( mesaCtx ) ||
947 !_vbo_CreateContext( mesaCtx ) ||
948 !_tnl_CreateContext( mesaCtx ) ||
949 !_swsetup_CreateContext( mesaCtx )) {
950 _mesa_free_context_data(&c->mesa);
951 free(c);
952 return NULL;
953 }
954
955 /* tnl setup */
956 tnl = TNL_CONTEXT(mesaCtx);
957 tnl->Driver.RunPipeline = _tnl_run_pipeline;
958 /* swrast setup */
959 xmesa_register_swrast_functions( mesaCtx );
960 _swsetup_Wakeup(mesaCtx);
961
962 _mesa_meta_init(mesaCtx);
963
964 return c;
965 }
966
967
968
969 PUBLIC
XMesaDestroyContext(XMesaContext c)970 void XMesaDestroyContext( XMesaContext c )
971 {
972 struct gl_context *mesaCtx = &c->mesa;
973
974 _mesa_meta_free( mesaCtx );
975
976 _swsetup_DestroyContext( mesaCtx );
977 _swrast_DestroyContext( mesaCtx );
978 _tnl_DestroyContext( mesaCtx );
979 _vbo_DestroyContext( mesaCtx );
980 _mesa_free_context_data( mesaCtx );
981 free( c );
982 }
983
984
985
986 /**
987 * Private function for creating an XMesaBuffer which corresponds to an
988 * X window or pixmap.
989 * \param v the window's XMesaVisual
990 * \param w the window we're wrapping
991 * \return new XMesaBuffer or NULL if error
992 */
993 PUBLIC XMesaBuffer
XMesaCreateWindowBuffer(XMesaVisual v,XMesaWindow w)994 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
995 {
996 XWindowAttributes attr;
997 XMesaBuffer b;
998 XMesaColormap cmap;
999 int depth;
1000
1001 assert(v);
1002 assert(w);
1003
1004 /* Check that window depth matches visual depth */
1005 XGetWindowAttributes( v->display, w, &attr );
1006 depth = attr.depth;
1007 if (GET_VISUAL_DEPTH(v) != depth) {
1008 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1009 GET_VISUAL_DEPTH(v), depth);
1010 return NULL;
1011 }
1012
1013 /* Find colormap */
1014 if (attr.colormap) {
1015 cmap = attr.colormap;
1016 }
1017 else {
1018 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1019 /* this is weird, a window w/out a colormap!? */
1020 /* OK, let's just allocate a new one and hope for the best */
1021 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1022 }
1023
1024 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1025 if (!b)
1026 return NULL;
1027
1028 if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1029 xmesa_free_buffer(b);
1030 return NULL;
1031 }
1032
1033 return b;
1034 }
1035
1036
1037
1038 /**
1039 * Create a new XMesaBuffer from an X pixmap.
1040 *
1041 * \param v the XMesaVisual
1042 * \param p the pixmap
1043 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1044 * \c GLX_DIRECT_COLOR visual for the pixmap
1045 * \returns new XMesaBuffer or NULL if error
1046 */
1047 PUBLIC XMesaBuffer
XMesaCreatePixmapBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap)1048 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1049 {
1050 XMesaBuffer b;
1051
1052 assert(v);
1053
1054 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1055 if (!b)
1056 return NULL;
1057
1058 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1059 xmesa_free_buffer(b);
1060 return NULL;
1061 }
1062
1063 return b;
1064 }
1065
1066
1067 /**
1068 * For GLX_EXT_texture_from_pixmap
1069 */
1070 XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap,int format,int target,int mipmap)1071 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1072 XMesaColormap cmap,
1073 int format, int target, int mipmap)
1074 {
1075 GET_CURRENT_CONTEXT(ctx);
1076 XMesaBuffer b;
1077 GLuint width, height;
1078
1079 assert(v);
1080
1081 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1082 if (!b)
1083 return NULL;
1084
1085 /* get pixmap size, update framebuffer/renderbuffer dims */
1086 xmesa_get_window_size(v->display, b, &width, &height);
1087 _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1088
1089 if (target == 0) {
1090 /* examine dims */
1091 if (ctx->Extensions.ARB_texture_non_power_of_two) {
1092 target = GLX_TEXTURE_2D_EXT;
1093 }
1094 else if ( _mesa_bitcount(width) == 1
1095 && _mesa_bitcount(height) == 1) {
1096 /* power of two size */
1097 if (height == 1) {
1098 target = GLX_TEXTURE_1D_EXT;
1099 }
1100 else {
1101 target = GLX_TEXTURE_2D_EXT;
1102 }
1103 }
1104 else if (ctx->Extensions.NV_texture_rectangle) {
1105 target = GLX_TEXTURE_RECTANGLE_EXT;
1106 }
1107 else {
1108 /* non power of two textures not supported */
1109 XMesaDestroyBuffer(b);
1110 return 0;
1111 }
1112 }
1113
1114 b->TextureTarget = target;
1115 b->TextureFormat = format;
1116 b->TextureMipmap = mipmap;
1117
1118 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1119 xmesa_free_buffer(b);
1120 return NULL;
1121 }
1122
1123 return b;
1124 }
1125
1126
1127
1128 XMesaBuffer
XMesaCreatePBuffer(XMesaVisual v,XMesaColormap cmap,unsigned int width,unsigned int height)1129 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1130 unsigned int width, unsigned int height)
1131 {
1132 XMesaWindow root;
1133 XMesaDrawable drawable; /* X Pixmap Drawable */
1134 XMesaBuffer b;
1135
1136 /* allocate pixmap for front buffer */
1137 root = RootWindow( v->display, v->visinfo->screen );
1138 drawable = XCreatePixmap(v->display, root, width, height,
1139 v->visinfo->depth);
1140 if (!drawable)
1141 return NULL;
1142
1143 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1144 if (!b)
1145 return NULL;
1146
1147 if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1148 xmesa_free_buffer(b);
1149 return NULL;
1150 }
1151
1152 return b;
1153 }
1154
1155
1156
1157 /*
1158 * Deallocate an XMesaBuffer structure and all related info.
1159 */
1160 PUBLIC void
XMesaDestroyBuffer(XMesaBuffer b)1161 XMesaDestroyBuffer(XMesaBuffer b)
1162 {
1163 xmesa_free_buffer(b);
1164 }
1165
1166
1167 /**
1168 * Query the current window size and update the corresponding struct gl_framebuffer
1169 * and all attached renderbuffers.
1170 * Called when:
1171 * 1. the first time a buffer is bound to a context.
1172 * 2. from glViewport to poll for window size changes
1173 * 3. from the XMesaResizeBuffers() API function.
1174 * Note: it's possible (and legal) for xmctx to be NULL. That can happen
1175 * when resizing a buffer when no rendering context is bound.
1176 */
1177 void
xmesa_check_and_update_buffer_size(XMesaContext xmctx,XMesaBuffer drawBuffer)1178 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1179 {
1180 GLuint width, height;
1181 xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1182 if (drawBuffer->mesa_buffer.Width != width ||
1183 drawBuffer->mesa_buffer.Height != height) {
1184 struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1185 _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1186 }
1187 drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1188 }
1189
1190
1191 /*
1192 * Bind buffer b to context c and make c the current rendering context.
1193 */
XMesaMakeCurrent(XMesaContext c,XMesaBuffer b)1194 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1195 {
1196 return XMesaMakeCurrent2( c, b, b );
1197 }
1198
1199
1200 /*
1201 * Bind buffer b to context c and make c the current rendering context.
1202 */
1203 PUBLIC
XMesaMakeCurrent2(XMesaContext c,XMesaBuffer drawBuffer,XMesaBuffer readBuffer)1204 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1205 XMesaBuffer readBuffer )
1206 {
1207 if (c) {
1208 if (!drawBuffer || !readBuffer)
1209 return GL_FALSE; /* must specify buffers! */
1210
1211 if (&(c->mesa) == _mesa_get_current_context()
1212 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1213 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1214 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1215 /* same context and buffer, do nothing */
1216 return GL_TRUE;
1217 }
1218
1219 c->xm_buffer = drawBuffer;
1220
1221 /* Call this periodically to detect when the user has begun using
1222 * GL rendering from multiple threads.
1223 */
1224 _glapi_check_multithread();
1225
1226 xmesa_check_and_update_buffer_size(c, drawBuffer);
1227 if (readBuffer != drawBuffer)
1228 xmesa_check_and_update_buffer_size(c, readBuffer);
1229
1230 _mesa_make_current(&(c->mesa),
1231 &drawBuffer->mesa_buffer,
1232 &readBuffer->mesa_buffer);
1233
1234 /*
1235 * Must recompute and set these pixel values because colormap
1236 * can be different for different windows.
1237 */
1238 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1239 c->clearcolor[0],
1240 c->clearcolor[1],
1241 c->clearcolor[2],
1242 c->clearcolor[3],
1243 c->xm_visual->undithered_pf);
1244 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1245
1246 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1247 drawBuffer->wasCurrent = GL_TRUE;
1248 }
1249 else {
1250 /* Detach */
1251 _mesa_make_current( NULL, NULL, NULL );
1252 }
1253 return GL_TRUE;
1254 }
1255
1256
1257 /*
1258 * Unbind the context c from its buffer.
1259 */
XMesaUnbindContext(XMesaContext c)1260 GLboolean XMesaUnbindContext( XMesaContext c )
1261 {
1262 /* A no-op for XFree86 integration purposes */
1263 return GL_TRUE;
1264 }
1265
1266
XMesaGetCurrentContext(void)1267 XMesaContext XMesaGetCurrentContext( void )
1268 {
1269 GET_CURRENT_CONTEXT(ctx);
1270 if (ctx) {
1271 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1272 return xmesa;
1273 }
1274 else {
1275 return 0;
1276 }
1277 }
1278
1279
XMesaGetCurrentBuffer(void)1280 XMesaBuffer XMesaGetCurrentBuffer( void )
1281 {
1282 GET_CURRENT_CONTEXT(ctx);
1283 if (ctx) {
1284 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1285 return xmbuf;
1286 }
1287 else {
1288 return 0;
1289 }
1290 }
1291
1292
1293 /* New in Mesa 3.1 */
XMesaGetCurrentReadBuffer(void)1294 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1295 {
1296 GET_CURRENT_CONTEXT(ctx);
1297 if (ctx) {
1298 return XMESA_BUFFER(ctx->ReadBuffer);
1299 }
1300 else {
1301 return 0;
1302 }
1303 }
1304
1305
1306
XMesaSetFXmode(GLint mode)1307 GLboolean XMesaSetFXmode( GLint mode )
1308 {
1309 (void) mode;
1310 return GL_FALSE;
1311 }
1312
1313
1314
1315 /*
1316 * Copy the back buffer to the front buffer. If there's no back buffer
1317 * this is a no-op.
1318 */
1319 PUBLIC
XMesaSwapBuffers(XMesaBuffer b)1320 void XMesaSwapBuffers( XMesaBuffer b )
1321 {
1322 GET_CURRENT_CONTEXT(ctx);
1323
1324 if (!b->backxrb) {
1325 /* single buffered */
1326 return;
1327 }
1328
1329 /* If we're swapping the buffer associated with the current context
1330 * we have to flush any pending rendering commands first.
1331 */
1332 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1333 _mesa_notifySwapBuffers(ctx);
1334
1335 if (b->db_mode) {
1336 if (b->backxrb->ximage) {
1337 /* Copy Ximage (back buf) from client memory to server window */
1338 #if defined(USE_XSHM)
1339 if (b->shm) {
1340 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1341 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1342 b->swapgc,
1343 b->backxrb->ximage, 0, 0,
1344 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1345 False );
1346 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1347 }
1348 else
1349 #endif
1350 {
1351 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1352 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1353 b->swapgc,
1354 b->backxrb->ximage, 0, 0,
1355 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1356 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1357 }
1358 }
1359 else if (b->backxrb->pixmap) {
1360 /* Copy pixmap (back buf) to window (front buf) on server */
1361 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1362 XMesaCopyArea( b->xm_visual->display,
1363 b->backxrb->pixmap, /* source drawable */
1364 b->frontxrb->drawable, /* dest. drawable */
1365 b->swapgc,
1366 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1367 0, 0 /* dest region */
1368 );
1369 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1370 }
1371 }
1372 XSync( b->xm_visual->display, False );
1373 }
1374
1375
1376
1377 /*
1378 * Copy sub-region of back buffer to front buffer
1379 */
XMesaCopySubBuffer(XMesaBuffer b,int x,int y,int width,int height)1380 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1381 {
1382 GET_CURRENT_CONTEXT(ctx);
1383
1384 /* If we're swapping the buffer associated with the current context
1385 * we have to flush any pending rendering commands first.
1386 */
1387 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1388 _mesa_notifySwapBuffers(ctx);
1389
1390 if (!b->backxrb) {
1391 /* single buffered */
1392 return;
1393 }
1394
1395 if (b->db_mode) {
1396 int yTop = b->mesa_buffer.Height - y - height;
1397 if (b->backxrb->ximage) {
1398 /* Copy Ximage from host's memory to server's window */
1399 #if defined(USE_XSHM)
1400 if (b->shm) {
1401 /* XXX assuming width and height aren't too large! */
1402 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1403 b->swapgc,
1404 b->backxrb->ximage, x, yTop,
1405 x, yTop, width, height, False );
1406 /* wait for finished event??? */
1407 }
1408 else
1409 #endif
1410 {
1411 /* XXX assuming width and height aren't too large! */
1412 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1413 b->swapgc,
1414 b->backxrb->ximage, x, yTop,
1415 x, yTop, width, height );
1416 }
1417 }
1418 else {
1419 /* Copy pixmap to window on server */
1420 XMesaCopyArea( b->xm_visual->display,
1421 b->backxrb->pixmap, /* source drawable */
1422 b->frontxrb->drawable, /* dest. drawable */
1423 b->swapgc,
1424 x, yTop, width, height, /* source region */
1425 x, yTop /* dest region */
1426 );
1427 }
1428 }
1429 }
1430
1431
1432 /*
1433 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
1434 * is a way to get "under the hood" of X/Mesa so one can manipulate the
1435 * back buffer directly.
1436 * Output: pixmap - pointer to back buffer's Pixmap, or 0
1437 * ximage - pointer to back buffer's XImage, or NULL
1438 * Return: GL_TRUE = context is double buffered
1439 * GL_FALSE = context is single buffered
1440 */
XMesaGetBackBuffer(XMesaBuffer b,XMesaPixmap * pixmap,XMesaImage ** ximage)1441 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1442 XMesaPixmap *pixmap,
1443 XMesaImage **ximage )
1444 {
1445 if (b->db_mode) {
1446 if (pixmap)
1447 *pixmap = b->backxrb->pixmap;
1448 if (ximage)
1449 *ximage = b->backxrb->ximage;
1450 return GL_TRUE;
1451 }
1452 else {
1453 *pixmap = 0;
1454 *ximage = NULL;
1455 return GL_FALSE;
1456 }
1457 }
1458
1459
1460 /*
1461 * Return the depth buffer associated with an XMesaBuffer.
1462 * Input: b - the XMesa buffer handle
1463 * Output: width, height - size of buffer in pixels
1464 * bytesPerValue - bytes per depth value (2 or 4)
1465 * buffer - pointer to depth buffer values
1466 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
1467 */
XMesaGetDepthBuffer(XMesaBuffer b,GLint * width,GLint * height,GLint * bytesPerValue,void ** buffer)1468 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1469 GLint *bytesPerValue, void **buffer )
1470 {
1471 struct gl_renderbuffer *rb
1472 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1473 struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1474
1475 if (!xrb || !xrb->Base.Buffer) {
1476 *width = 0;
1477 *height = 0;
1478 *bytesPerValue = 0;
1479 *buffer = 0;
1480 return GL_FALSE;
1481 }
1482 else {
1483 *width = b->mesa_buffer.Width;
1484 *height = b->mesa_buffer.Height;
1485 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1486 ? sizeof(GLushort) : sizeof(GLuint);
1487 *buffer = (void *) xrb->Base.Buffer;
1488 return GL_TRUE;
1489 }
1490 }
1491
1492
XMesaFlush(XMesaContext c)1493 void XMesaFlush( XMesaContext c )
1494 {
1495 if (c && c->xm_visual) {
1496 XSync( c->xm_visual->display, False );
1497 }
1498 }
1499
1500
1501
XMesaGetString(XMesaContext c,int name)1502 const char *XMesaGetString( XMesaContext c, int name )
1503 {
1504 (void) c;
1505 if (name==XMESA_VERSION) {
1506 return "5.0";
1507 }
1508 else if (name==XMESA_EXTENSIONS) {
1509 return "";
1510 }
1511 else {
1512 return NULL;
1513 }
1514 }
1515
1516
1517
XMesaFindBuffer(XMesaDisplay * dpy,XMesaDrawable d)1518 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1519 {
1520 XMesaBuffer b;
1521 for (b=XMesaBufferList; b; b=b->Next) {
1522 if (b->frontxrb->drawable == d && b->display == dpy) {
1523 return b;
1524 }
1525 }
1526 return NULL;
1527 }
1528
1529
1530 /**
1531 * Free/destroy all XMesaBuffers associated with given display.
1532 */
xmesa_destroy_buffers_on_display(XMesaDisplay * dpy)1533 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1534 {
1535 XMesaBuffer b, next;
1536 for (b = XMesaBufferList; b; b = next) {
1537 next = b->Next;
1538 if (b->display == dpy) {
1539 xmesa_free_buffer(b);
1540 }
1541 }
1542 }
1543
1544
1545 /*
1546 * Look for XMesaBuffers whose X window has been destroyed.
1547 * Deallocate any such XMesaBuffers.
1548 */
XMesaGarbageCollect(XMesaDisplay * dpy)1549 void XMesaGarbageCollect( XMesaDisplay* dpy )
1550 {
1551 XMesaBuffer b, next;
1552 for (b=XMesaBufferList; b; b=next) {
1553 next = b->Next;
1554 if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1555 XSync(b->display, False);
1556 if (!window_exists( b->display, b->frontxrb->drawable )) {
1557 /* found a dead window, free the ancillary info */
1558 XMesaDestroyBuffer( b );
1559 }
1560 }
1561 }
1562 }
1563
1564
XMesaDitherColor(XMesaContext xmesa,GLint x,GLint y,GLfloat red,GLfloat green,GLfloat blue,GLfloat alpha)1565 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1566 GLfloat red, GLfloat green,
1567 GLfloat blue, GLfloat alpha )
1568 {
1569 GLint r = (GLint) (red * 255.0F);
1570 GLint g = (GLint) (green * 255.0F);
1571 GLint b = (GLint) (blue * 255.0F);
1572 GLint a = (GLint) (alpha * 255.0F);
1573
1574 switch (xmesa->pixelformat) {
1575 case PF_Truecolor:
1576 {
1577 unsigned long p;
1578 PACK_TRUECOLOR( p, r, g, b );
1579 return p;
1580 }
1581 case PF_8A8B8G8R:
1582 return PACK_8A8B8G8R( r, g, b, a );
1583 case PF_8A8R8G8B:
1584 return PACK_8A8R8G8B( r, g, b, a );
1585 case PF_8R8G8B:
1586 return PACK_8R8G8B( r, g, b );
1587 case PF_5R6G5B:
1588 return PACK_5R6G5B( r, g, b );
1589 case PF_Dither_5R6G5B:
1590 /* fall through */
1591 case PF_Dither_True:
1592 {
1593 unsigned long p;
1594 PACK_TRUEDITHER(p, x, y, r, g, b);
1595 return p;
1596 }
1597 default:
1598 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1599 }
1600 return 0;
1601 }
1602
1603
1604 /*
1605 * This is typically called when the window size changes and we need
1606 * to reallocate the buffer's back/depth/stencil/accum buffers.
1607 */
1608 PUBLIC void
XMesaResizeBuffers(XMesaBuffer b)1609 XMesaResizeBuffers( XMesaBuffer b )
1610 {
1611 GET_CURRENT_CONTEXT(ctx);
1612 XMesaContext xmctx = XMESA_CONTEXT(ctx);
1613 if (!xmctx)
1614 return;
1615 xmesa_check_and_update_buffer_size(xmctx, b);
1616 }
1617
1618
1619 static GLint
xbuffer_to_renderbuffer(int buffer)1620 xbuffer_to_renderbuffer(int buffer)
1621 {
1622 assert(MAX_AUX_BUFFERS <= 4);
1623
1624 switch (buffer) {
1625 case GLX_FRONT_LEFT_EXT:
1626 return BUFFER_FRONT_LEFT;
1627 case GLX_FRONT_RIGHT_EXT:
1628 return BUFFER_FRONT_RIGHT;
1629 case GLX_BACK_LEFT_EXT:
1630 return BUFFER_BACK_LEFT;
1631 case GLX_BACK_RIGHT_EXT:
1632 return BUFFER_BACK_RIGHT;
1633 case GLX_AUX0_EXT:
1634 return BUFFER_AUX0;
1635 case GLX_AUX1_EXT:
1636 case GLX_AUX2_EXT:
1637 case GLX_AUX3_EXT:
1638 case GLX_AUX4_EXT:
1639 case GLX_AUX5_EXT:
1640 case GLX_AUX6_EXT:
1641 case GLX_AUX7_EXT:
1642 case GLX_AUX8_EXT:
1643 case GLX_AUX9_EXT:
1644 default:
1645 /* BadValue error */
1646 return -1;
1647 }
1648 }
1649
1650
1651 PUBLIC void
XMesaBindTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer,const int * attrib_list)1652 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1653 const int *attrib_list)
1654 {
1655 #if 0
1656 GET_CURRENT_CONTEXT(ctx);
1657 const GLuint unit = ctx->Texture.CurrentUnit;
1658 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1659 struct gl_texture_object *texObj;
1660 #endif
1661 struct gl_renderbuffer *rb;
1662 struct xmesa_renderbuffer *xrb;
1663 GLint b;
1664 XMesaImage *img = NULL;
1665 GLboolean freeImg = GL_FALSE;
1666
1667 b = xbuffer_to_renderbuffer(buffer);
1668 if (b < 0)
1669 return;
1670
1671 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1672 return; /* BadMatch error */
1673
1674 rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1675 if (!rb) {
1676 /* invalid buffer */
1677 return;
1678 }
1679 xrb = xmesa_renderbuffer(rb);
1680
1681 #if 0
1682 switch (drawable->TextureTarget) {
1683 case GLX_TEXTURE_1D_EXT:
1684 texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1685 break;
1686 case GLX_TEXTURE_2D_EXT:
1687 texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1688 break;
1689 case GLX_TEXTURE_RECTANGLE_EXT:
1690 texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1691 break;
1692 default:
1693 return; /* BadMatch error */
1694 }
1695 #endif
1696
1697 /*
1698 * The following is a quick and simple way to implement
1699 * BindTexImage. The better way is to write some new FetchTexel()
1700 * functions which would extract texels from XImages. We'd still
1701 * need to use GetImage when texturing from a Pixmap (front buffer)
1702 * but texturing from a back buffer (XImage) would avoid an image
1703 * copy.
1704 */
1705
1706 /* get XImage */
1707 if (xrb->pixmap) {
1708 img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1709 ZPixmap);
1710 freeImg = GL_TRUE;
1711 }
1712 else if (xrb->ximage) {
1713 img = xrb->ximage;
1714 }
1715
1716 /* store the XImage as a new texture image */
1717 if (img) {
1718 GLenum format, type, intFormat;
1719 if (img->bits_per_pixel == 32) {
1720 format = GL_BGRA;
1721 type = GL_UNSIGNED_BYTE;
1722 intFormat = GL_RGBA;
1723 }
1724 else if (img->bits_per_pixel == 24) {
1725 format = GL_BGR;
1726 type = GL_UNSIGNED_BYTE;
1727 intFormat = GL_RGB;
1728 }
1729 else if (img->bits_per_pixel == 16) {
1730 format = GL_BGR;
1731 type = GL_UNSIGNED_SHORT_5_6_5;
1732 intFormat = GL_RGB;
1733 }
1734 else {
1735 _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1736 return;
1737 }
1738 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1739 intFormat = GL_RGBA;
1740 }
1741 else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1742 intFormat = GL_RGB;
1743 }
1744
1745 _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1746 format, type, img->data);
1747
1748 if (freeImg) {
1749 XMesaDestroyImage(img);
1750 }
1751 }
1752 }
1753
1754
1755
1756 PUBLIC void
XMesaReleaseTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer)1757 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1758 {
1759 const GLint b = xbuffer_to_renderbuffer(buffer);
1760 if (b < 0)
1761 return;
1762
1763 /* no-op for now */
1764 }
1765
1766