1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * 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 <stdio.h>
66 #include "glxheader.h"
67 #include "xmesaP.h"
68 #include "main/api_exec.h"
69 #include "main/context.h"
70 #include "main/extensions.h"
71 #include "main/framebuffer.h"
72 #include "main/imports.h"
73 #include "main/macros.h"
74 #include "main/renderbuffer.h"
75 #include "main/teximage.h"
76 #include "main/version.h"
77 #include "main/vtxfmt.h"
78 #include "swrast/swrast.h"
79 #include "swrast/s_renderbuffer.h"
80 #include "swrast_setup/swrast_setup.h"
81 #include "vbo/vbo.h"
82 #include "tnl/tnl.h"
83 #include "tnl/t_context.h"
84 #include "tnl/t_pipeline.h"
85 #include "drivers/common/driverfuncs.h"
86 #include "drivers/common/meta.h"
87
88 /**
89 * Global X driver lock
90 */
91 mtx_t _xmesa_lock;
92
93
94
95 /**********************************************************************/
96 /***** X Utility Functions *****/
97 /**********************************************************************/
98
99
100 /**
101 * Return the host's byte order as LSBFirst or MSBFirst ala X.
102 */
host_byte_order(void)103 static int host_byte_order( void )
104 {
105 int i = 1;
106 char *cptr = (char *) &i;
107 return (*cptr==1) ? LSBFirst : MSBFirst;
108 }
109
110
111 /**
112 * Check if the X Shared Memory extension is available.
113 * Return: 0 = not available
114 * 1 = shared XImage support available
115 * 2 = shared Pixmap support available also
116 */
check_for_xshm(XMesaDisplay * display)117 static int check_for_xshm( XMesaDisplay *display )
118 {
119 #if defined(USE_XSHM)
120 int ignore;
121
122 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
123 /* Note: we're no longer calling XShmQueryVersion() here. It seems
124 * to be flakey (triggers a spurious X protocol error when we close
125 * one display connection and start using a new one. XShm has been
126 * around a long time and hasn't changed so if MIT_SHM is supported
127 * we assume we're good to go.
128 */
129 return 2;
130 }
131 else {
132 return 0;
133 }
134 #else
135 /* No XSHM support */
136 return 0;
137 #endif
138 }
139
140
141 /**
142 * Apply gamma correction to an intensity value in [0..max]. Return the
143 * new intensity value.
144 */
145 static GLint
gamma_adjust(GLfloat gamma,GLint value,GLint max)146 gamma_adjust( GLfloat gamma, GLint value, GLint max )
147 {
148 if (gamma == 1.0) {
149 return value;
150 }
151 else {
152 double x = (double) value / (double) max;
153 return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
154 }
155 }
156
157
158
159 /**
160 * Return the true number of bits per pixel for XImages.
161 * For example, if we request a 24-bit deep visual we may actually need/get
162 * 32bpp XImages. This function returns the appropriate bpp.
163 * Input: dpy - the X display
164 * visinfo - desribes the visual to be used for XImages
165 * Return: true number of bits per pixel for XImages
166 */
167 static int
bits_per_pixel(XMesaVisual xmv)168 bits_per_pixel( XMesaVisual xmv )
169 {
170 XMesaDisplay *dpy = xmv->display;
171 XMesaVisualInfo visinfo = xmv->visinfo;
172 XMesaImage *img;
173 int bitsPerPixel;
174 /* Create a temporary XImage */
175 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
176 ZPixmap, 0, /*format, offset*/
177 malloc(8), /*data*/
178 1, 1, /*width, height*/
179 32, /*bitmap_pad*/
180 0 /*bytes_per_line*/
181 );
182 assert(img);
183 /* grab the bits/pixel value */
184 bitsPerPixel = img->bits_per_pixel;
185 /* free the XImage */
186 free( img->data );
187 img->data = NULL;
188 XMesaDestroyImage( img );
189 return bitsPerPixel;
190 }
191
192
193
194 /*
195 * Determine if a given X window ID is valid (window exists).
196 * Do this by calling XGetWindowAttributes() for the window and
197 * checking if we catch an X error.
198 * Input: dpy - the display
199 * win - the window to check for existence
200 * Return: GL_TRUE - window exists
201 * GL_FALSE - window doesn't exist
202 */
203 static GLboolean WindowExistsFlag;
204
window_exists_err_handler(XMesaDisplay * dpy,XErrorEvent * xerr)205 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
206 {
207 (void) dpy;
208 if (xerr->error_code == BadWindow) {
209 WindowExistsFlag = GL_FALSE;
210 }
211 return 0;
212 }
213
window_exists(XMesaDisplay * dpy,Window win)214 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
215 {
216 XWindowAttributes wa;
217 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
218 WindowExistsFlag = GL_TRUE;
219 old_handler = XSetErrorHandler(window_exists_err_handler);
220 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
221 XSetErrorHandler(old_handler);
222 return WindowExistsFlag;
223 }
224
225 static Status
get_drawable_size(XMesaDisplay * dpy,Drawable d,GLuint * width,GLuint * height)226 get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
227 {
228 Window root;
229 Status stat;
230 int xpos, ypos;
231 unsigned int w, h, bw, depth;
232 stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
233 *width = w;
234 *height = h;
235 return stat;
236 }
237
238
239 /**
240 * Return the size of the window (or pixmap) that corresponds to the
241 * given XMesaBuffer.
242 * \param width returns width in pixels
243 * \param height returns height in pixels
244 */
245 void
xmesa_get_window_size(XMesaDisplay * dpy,XMesaBuffer b,GLuint * width,GLuint * height)246 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
247 GLuint *width, GLuint *height)
248 {
249 Status stat;
250
251 mtx_lock(&_xmesa_lock);
252 XSync(b->xm_visual->display, 0); /* added for Chromium */
253 stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
254 mtx_unlock(&_xmesa_lock);
255
256 if (!stat) {
257 /* probably querying a window that's recently been destroyed */
258 _mesa_warning(NULL, "XGetGeometry failed!\n");
259 *width = *height = 1;
260 }
261 }
262
263
264
265 /**********************************************************************/
266 /***** Linked list of XMesaBuffers *****/
267 /**********************************************************************/
268
269 XMesaBuffer XMesaBufferList = NULL;
270
271
272 /**
273 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
274 * Note that XMesaBuffer is derived from struct gl_framebuffer.
275 * The new XMesaBuffer will not have any size (Width=Height=0).
276 *
277 * \param d the corresponding X drawable (window or pixmap)
278 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
279 * \param vis the buffer's visual
280 * \param cmap the window's colormap, if known.
281 * \return new XMesaBuffer or NULL if any problem
282 */
283 static XMesaBuffer
create_xmesa_buffer(XMesaDrawable d,BufferType type,XMesaVisual vis,XMesaColormap cmap)284 create_xmesa_buffer(XMesaDrawable d, BufferType type,
285 XMesaVisual vis, XMesaColormap cmap)
286 {
287 XMesaBuffer b;
288
289 assert(type == WINDOW || type == PIXMAP || type == PBUFFER);
290
291 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
292 if (!b)
293 return NULL;
294
295 b->display = vis->display;
296 b->xm_visual = vis;
297 b->type = type;
298 b->cmap = cmap;
299
300 _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
301 b->mesa_buffer.Delete = xmesa_delete_framebuffer;
302
303 /*
304 * Front renderbuffer
305 */
306 b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
307 if (!b->frontxrb) {
308 free(b);
309 return NULL;
310 }
311 b->frontxrb->Parent = b;
312 b->frontxrb->drawable = d;
313 b->frontxrb->pixmap = (XMesaPixmap) d;
314 _mesa_attach_and_own_rb(&b->mesa_buffer, BUFFER_FRONT_LEFT,
315 &b->frontxrb->Base.Base);
316
317 /*
318 * Back renderbuffer
319 */
320 if (vis->mesa_visual.doubleBufferMode) {
321 b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
322 if (!b->backxrb) {
323 /* XXX free front xrb too */
324 free(b);
325 return NULL;
326 }
327 b->backxrb->Parent = b;
328 /* determine back buffer implementation */
329 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
330
331 _mesa_attach_and_own_rb(&b->mesa_buffer, BUFFER_BACK_LEFT,
332 &b->backxrb->Base.Base);
333 }
334
335 /*
336 * Other renderbuffer (depth, stencil, etc)
337 */
338 _swrast_add_soft_renderbuffers(&b->mesa_buffer,
339 GL_FALSE, /* color */
340 vis->mesa_visual.haveDepthBuffer,
341 vis->mesa_visual.haveStencilBuffer,
342 vis->mesa_visual.haveAccumBuffer,
343 GL_FALSE, /* software alpha buffer */
344 vis->mesa_visual.numAuxBuffers > 0 );
345
346 /* GLX_EXT_texture_from_pixmap */
347 b->TextureTarget = 0;
348 b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
349 b->TextureMipmap = 0;
350
351 /* insert buffer into linked list */
352 b->Next = XMesaBufferList;
353 XMesaBufferList = b;
354
355 return b;
356 }
357
358
359 /**
360 * Find an XMesaBuffer by matching X display and colormap but NOT matching
361 * the notThis buffer.
362 */
363 XMesaBuffer
xmesa_find_buffer(XMesaDisplay * dpy,XMesaColormap cmap,XMesaBuffer notThis)364 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
365 {
366 XMesaBuffer b;
367 for (b=XMesaBufferList; b; b=b->Next) {
368 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
369 return b;
370 }
371 }
372 return NULL;
373 }
374
375
376 /**
377 * Remove buffer from linked list, delete if no longer referenced.
378 */
379 static void
xmesa_free_buffer(XMesaBuffer buffer)380 xmesa_free_buffer(XMesaBuffer buffer)
381 {
382 XMesaBuffer prev = NULL, b;
383
384 for (b = XMesaBufferList; b; b = b->Next) {
385 if (b == buffer) {
386 struct gl_framebuffer *fb = &buffer->mesa_buffer;
387
388 /* unlink buffer from list */
389 if (prev)
390 prev->Next = buffer->Next;
391 else
392 XMesaBufferList = buffer->Next;
393
394 /* mark as delete pending */
395 fb->DeletePending = GL_TRUE;
396
397 /* Since the X window for the XMesaBuffer is going away, we don't
398 * want to dereference this pointer in the future.
399 */
400 b->frontxrb->drawable = 0;
401
402 /* Unreference. If count = zero we'll really delete the buffer */
403 _mesa_reference_framebuffer(&fb, NULL);
404
405 return;
406 }
407 /* continue search */
408 prev = b;
409 }
410 /* buffer not found in XMesaBufferList */
411 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
412 }
413
414
415
416
417 /**********************************************************************/
418 /***** Misc Private Functions *****/
419 /**********************************************************************/
420
421
422 /**
423 * Setup RGB rendering for a window with a True/DirectColor visual.
424 */
425 static void
setup_truecolor(XMesaVisual v,XMesaBuffer buffer,XMesaColormap cmap)426 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
427 {
428 unsigned long rmask, gmask, bmask;
429 (void) buffer;
430 (void) cmap;
431
432 /* Compute red multiplier (mask) and bit shift */
433 v->rshift = 0;
434 rmask = GET_REDMASK(v);
435 while ((rmask & 1)==0) {
436 v->rshift++;
437 rmask = rmask >> 1;
438 }
439
440 /* Compute green multiplier (mask) and bit shift */
441 v->gshift = 0;
442 gmask = GET_GREENMASK(v);
443 while ((gmask & 1)==0) {
444 v->gshift++;
445 gmask = gmask >> 1;
446 }
447
448 /* Compute blue multiplier (mask) and bit shift */
449 v->bshift = 0;
450 bmask = GET_BLUEMASK(v);
451 while ((bmask & 1)==0) {
452 v->bshift++;
453 bmask = bmask >> 1;
454 }
455
456 /*
457 * Compute component-to-pixel lookup tables and dithering kernel
458 */
459 {
460 static GLubyte kernel[16] = {
461 0*16, 8*16, 2*16, 10*16,
462 12*16, 4*16, 14*16, 6*16,
463 3*16, 11*16, 1*16, 9*16,
464 15*16, 7*16, 13*16, 5*16,
465 };
466 GLint rBits = _mesa_bitcount(rmask);
467 GLint gBits = _mesa_bitcount(gmask);
468 GLint bBits = _mesa_bitcount(bmask);
469 GLint maxBits;
470 GLuint i;
471
472 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
473 for (i=0; i<=rmask; i++)
474 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
475 for (i=0; i<=gmask; i++)
476 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
477 for (i=0; i<=bmask; i++)
478 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
479
480 /* convert RGB values from [0,255] to pixel components */
481
482 for (i=0;i<256;i++) {
483 GLint r = gamma_adjust(v->RedGamma, i, 255);
484 GLint g = gamma_adjust(v->GreenGamma, i, 255);
485 GLint b = gamma_adjust(v->BlueGamma, i, 255);
486 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
487 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
488 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
489 }
490 /* overflow protection */
491 for (i=256;i<512;i++) {
492 v->RtoPixel[i] = v->RtoPixel[255];
493 v->GtoPixel[i] = v->GtoPixel[255];
494 v->BtoPixel[i] = v->BtoPixel[255];
495 }
496
497 /* setup dithering kernel */
498 maxBits = rBits;
499 if (gBits > maxBits) maxBits = gBits;
500 if (bBits > maxBits) maxBits = bBits;
501 for (i=0;i<16;i++) {
502 v->Kernel[i] = kernel[i] >> maxBits;
503 }
504
505 v->undithered_pf = PF_Truecolor;
506 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
507 }
508
509 /*
510 * Now check for TrueColor visuals which we can optimize.
511 */
512 if ( GET_REDMASK(v) ==0x0000ff
513 && GET_GREENMASK(v)==0x00ff00
514 && GET_BLUEMASK(v) ==0xff0000
515 && CHECK_BYTE_ORDER(v)
516 && v->BitsPerPixel==32
517 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
518 /* common 32 bpp config used on SGI, Sun */
519 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
520 }
521 else if (GET_REDMASK(v) == 0xff0000
522 && GET_GREENMASK(v)== 0x00ff00
523 && GET_BLUEMASK(v) == 0x0000ff
524 && CHECK_BYTE_ORDER(v)
525 && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
526 if (v->BitsPerPixel==32) {
527 /* if 32 bpp, and visual indicates 8 bpp alpha channel */
528 if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
529 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
530 else
531 v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
532 }
533 else if (v->BitsPerPixel == 24) {
534 v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
535 }
536 }
537 else if (GET_REDMASK(v) ==0xf800
538 && GET_GREENMASK(v)==0x07e0
539 && GET_BLUEMASK(v) ==0x001f
540 && CHECK_BYTE_ORDER(v)
541 && v->BitsPerPixel==16
542 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
543 /* 5-6-5 RGB */
544 v->undithered_pf = PF_5R6G5B;
545 v->dithered_pf = PF_Dither_5R6G5B;
546 }
547 }
548
549
550 /**
551 * When a context is bound for the first time, we can finally finish
552 * initializing the context's visual and buffer information.
553 * \param v the XMesaVisual to initialize
554 * \param b the XMesaBuffer to initialize (may be NULL)
555 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
556 * \param window the window/pixmap we're rendering into
557 * \param cmap the colormap associated with the window/pixmap
558 * \return GL_TRUE=success, GL_FALSE=failure
559 */
560 static GLboolean
initialize_visual_and_buffer(XMesaVisual v,XMesaBuffer b,XMesaDrawable window,XMesaColormap cmap)561 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
562 XMesaDrawable window,
563 XMesaColormap cmap)
564 {
565 const int xclass = v->visualType;
566
567
568 assert(!b || b->xm_visual == v);
569
570 /* Save true bits/pixel */
571 v->BitsPerPixel = bits_per_pixel(v);
572 assert(v->BitsPerPixel > 0);
573
574 /* RGB WINDOW:
575 * We support RGB rendering into almost any kind of visual.
576 */
577 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
578 setup_truecolor( v, b, cmap );
579 }
580 else {
581 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
582 return GL_FALSE;
583 }
584 v->mesa_visual.indexBits = 0;
585
586 if (getenv("MESA_NO_DITHER")) {
587 v->dithered_pf = v->undithered_pf;
588 }
589
590
591 /*
592 * If MESA_INFO env var is set print out some debugging info
593 * which can help Brian figure out what's going on when a user
594 * reports bugs.
595 */
596 if (getenv("MESA_INFO")) {
597 printf("X/Mesa visual = %p\n", (void *) v);
598 printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
599 printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
600 printf("X/Mesa level = %d\n", v->mesa_visual.level);
601 printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
602 printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
603 }
604
605 if (b && window) {
606 /* Do window-specific initializations */
607
608 /* these should have been set in create_xmesa_buffer */
609 assert(b->frontxrb->drawable == window);
610 assert(b->frontxrb->pixmap == (XMesaPixmap) window);
611
612 /* Setup for single/double buffering */
613 if (v->mesa_visual.doubleBufferMode) {
614 /* Double buffered */
615 b->shm = check_for_xshm( v->display );
616 }
617
618 /* X11 graphics contexts */
619 b->gc = XCreateGC( v->display, window, 0, NULL );
620 XMesaSetFunction( v->display, b->gc, GXcopy );
621
622 /* cleargc - for glClear() */
623 b->cleargc = XCreateGC( v->display, window, 0, NULL );
624 XMesaSetFunction( v->display, b->cleargc, GXcopy );
625
626 /*
627 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
628 * Patch contributed by Michael Pichler May 15, 1995.
629 */
630 {
631 XGCValues gcvalues;
632 gcvalues.graphics_exposures = False;
633 b->swapgc = XCreateGC(v->display, window,
634 GCGraphicsExposures, &gcvalues);
635 }
636 XMesaSetFunction( v->display, b->swapgc, GXcopy );
637 }
638
639 return GL_TRUE;
640 }
641
642
643
644 /*
645 * Convert an RGBA color to a pixel value.
646 */
647 unsigned long
xmesa_color_to_pixel(struct gl_context * ctx,GLubyte r,GLubyte g,GLubyte b,GLubyte a,GLuint pixelFormat)648 xmesa_color_to_pixel(struct gl_context *ctx,
649 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
650 GLuint pixelFormat)
651 {
652 XMesaContext xmesa = XMESA_CONTEXT(ctx);
653 switch (pixelFormat) {
654 case PF_Truecolor:
655 {
656 unsigned long p;
657 PACK_TRUECOLOR( p, r, g, b );
658 return p;
659 }
660 case PF_8A8B8G8R:
661 return PACK_8A8B8G8R( r, g, b, a );
662 case PF_8A8R8G8B:
663 return PACK_8A8R8G8B( r, g, b, a );
664 case PF_8R8G8B:
665 /* fall through */
666 case PF_8R8G8B24:
667 return PACK_8R8G8B( r, g, b );
668 case PF_5R6G5B:
669 return PACK_5R6G5B( r, g, b );
670 case PF_Dither_True:
671 /* fall through */
672 case PF_Dither_5R6G5B:
673 {
674 unsigned long p;
675 PACK_TRUEDITHER(p, 1, 0, r, g, b);
676 return p;
677 }
678 default:
679 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
680 }
681 return 0;
682 }
683
684
685 #define NUM_VISUAL_TYPES 6
686
687 /**
688 * Convert an X visual type to a GLX visual type.
689 *
690 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
691 * to be converted.
692 * \return If \c visualType is a valid X visual type, a GLX visual type will
693 * be returned. Otherwise \c GLX_NONE will be returned.
694 *
695 * \note
696 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
697 * DRI CVS tree.
698 */
699 static GLint
xmesa_convert_from_x_visual_type(int visualType)700 xmesa_convert_from_x_visual_type( int visualType )
701 {
702 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
703 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
704 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
705 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
706 };
707
708 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
709 ? glx_visual_types[ visualType ] : GLX_NONE;
710 }
711
712
713 /**********************************************************************/
714 /***** Public Functions *****/
715 /**********************************************************************/
716
717
718 /*
719 * Create a new X/Mesa visual.
720 * Input: display - X11 display
721 * visinfo - an XVisualInfo pointer
722 * rgb_flag - GL_TRUE = RGB mode,
723 * GL_FALSE = color index mode
724 * alpha_flag - alpha buffer requested?
725 * db_flag - GL_TRUE = double-buffered,
726 * GL_FALSE = single buffered
727 * stereo_flag - stereo visual?
728 * ximage_flag - GL_TRUE = use an XImage for back buffer,
729 * GL_FALSE = use an off-screen pixmap for back buffer
730 * depth_size - requested bits/depth values, or zero
731 * stencil_size - requested bits/stencil values, or zero
732 * accum_red_size - requested bits/red accum values, or zero
733 * accum_green_size - requested bits/green accum values, or zero
734 * accum_blue_size - requested bits/blue accum values, or zero
735 * accum_alpha_size - requested bits/alpha accum values, or zero
736 * num_samples - number of samples/pixel if multisampling, or zero
737 * level - visual level, usually 0
738 * visualCaveat - ala the GLX extension, usually GLX_NONE
739 * Return; a new XMesaVisual or 0 if error.
740 */
741 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)742 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
743 XMesaVisualInfo visinfo,
744 GLboolean rgb_flag,
745 GLboolean alpha_flag,
746 GLboolean db_flag,
747 GLboolean stereo_flag,
748 GLboolean ximage_flag,
749 GLint depth_size,
750 GLint stencil_size,
751 GLint accum_red_size,
752 GLint accum_green_size,
753 GLint accum_blue_size,
754 GLint accum_alpha_size,
755 GLint num_samples,
756 GLint level,
757 GLint visualCaveat )
758 {
759 char *gamma;
760 XMesaVisual v;
761 GLint red_bits, green_bits, blue_bits, alpha_bits;
762
763 /* For debugging only */
764 if (getenv("MESA_XSYNC")) {
765 /* This makes debugging X easier.
766 * In your debugger, set a breakpoint on _XError to stop when an
767 * X protocol error is generated.
768 */
769 XSynchronize( display, 1 );
770 }
771
772 /* Color-index rendering not supported. */
773 if (!rgb_flag)
774 return NULL;
775
776 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
777 if (!v) {
778 return NULL;
779 }
780
781 v->display = display;
782
783 /* Save a copy of the XVisualInfo struct because the user may Xfree()
784 * the struct but we may need some of the information contained in it
785 * at a later time.
786 */
787 v->visinfo = malloc(sizeof(*visinfo));
788 if(!v->visinfo) {
789 free(v);
790 return NULL;
791 }
792 memcpy(v->visinfo, visinfo, sizeof(*visinfo));
793
794 /* check for MESA_GAMMA environment variable */
795 gamma = getenv("MESA_GAMMA");
796 if (gamma) {
797 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
798 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
799 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
800 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
801 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
802 }
803 else {
804 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
805 }
806
807 v->ximage_flag = ximage_flag;
808
809 v->mesa_visual.redMask = visinfo->red_mask;
810 v->mesa_visual.greenMask = visinfo->green_mask;
811 v->mesa_visual.blueMask = visinfo->blue_mask;
812 v->visualID = visinfo->visualid;
813 v->screen = visinfo->screen;
814
815 #if !(defined(__cplusplus) || defined(c_plusplus))
816 v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
817 #else
818 v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
819 #endif
820
821 v->mesa_visual.visualRating = visualCaveat;
822
823 if (alpha_flag)
824 v->mesa_visual.alphaBits = 8;
825
826 (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
827
828 {
829 const int xclass = v->visualType;
830 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
831 red_bits = _mesa_bitcount(GET_REDMASK(v));
832 green_bits = _mesa_bitcount(GET_GREENMASK(v));
833 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
834 }
835 else {
836 /* this is an approximation */
837 int depth;
838 depth = GET_VISUAL_DEPTH(v);
839 red_bits = depth / 3;
840 depth -= red_bits;
841 green_bits = depth / 2;
842 depth -= green_bits;
843 blue_bits = depth;
844 alpha_bits = 0;
845 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
846 }
847 alpha_bits = v->mesa_visual.alphaBits;
848 }
849
850 if (!_mesa_initialize_visual(&v->mesa_visual,
851 db_flag, stereo_flag,
852 red_bits, green_bits,
853 blue_bits, alpha_bits,
854 depth_size,
855 stencil_size,
856 accum_red_size, accum_green_size,
857 accum_blue_size, accum_alpha_size,
858 0)) {
859 free(v->visinfo);
860 free(v);
861 return NULL;
862 }
863
864 /* XXX minor hack */
865 v->mesa_visual.level = level;
866 return v;
867 }
868
869
870 PUBLIC
XMesaDestroyVisual(XMesaVisual v)871 void XMesaDestroyVisual( XMesaVisual v )
872 {
873 free(v->visinfo);
874 free(v);
875 }
876
877
878
879 /**
880 * Create a new XMesaContext.
881 * \param v the XMesaVisual
882 * \param share_list another XMesaContext with which to share display
883 * lists or NULL if no sharing is wanted.
884 * \return an XMesaContext or NULL if error.
885 */
886 PUBLIC
XMesaCreateContext(XMesaVisual v,XMesaContext share_list)887 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
888 {
889 static GLboolean firstTime = GL_TRUE;
890 XMesaContext c;
891 struct gl_context *mesaCtx;
892 struct dd_function_table functions;
893 TNLcontext *tnl;
894
895 if (firstTime) {
896 mtx_init(&_xmesa_lock, mtx_plain);
897 firstTime = GL_FALSE;
898 }
899
900 /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
901 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
902 if (!c)
903 return NULL;
904
905 mesaCtx = &(c->mesa);
906
907 /* initialize with default driver functions, then plug in XMesa funcs */
908 _mesa_init_driver_functions(&functions);
909 xmesa_init_driver_functions(v, &functions);
910 if (!_mesa_initialize_context(mesaCtx, API_OPENGL_COMPAT, &v->mesa_visual,
911 share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
912 &functions)) {
913 free(c);
914 return NULL;
915 }
916
917 /* Enable this to exercise fixed function -> shader translation
918 * with software rendering.
919 */
920 if (0) {
921 mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
922 mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
923 }
924
925 _mesa_enable_sw_extensions(mesaCtx);
926
927 #if ENABLE_EXT_timer_query
928 mesaCtx->Extensions.EXT_timer_query = GL_TRUE;
929 #endif
930
931
932 /* finish up xmesa context initializations */
933 c->direct = GL_TRUE;
934 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
935 c->xm_visual = v;
936 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
937 c->display = v->display;
938 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
939
940 /* Initialize the software rasterizer and helper modules.
941 */
942 if (!_swrast_CreateContext( mesaCtx ) ||
943 !_vbo_CreateContext( mesaCtx ) ||
944 !_tnl_CreateContext( mesaCtx ) ||
945 !_swsetup_CreateContext( mesaCtx )) {
946 _mesa_free_context_data(&c->mesa);
947 free(c);
948 return NULL;
949 }
950
951 /* tnl setup */
952 tnl = TNL_CONTEXT(mesaCtx);
953 tnl->Driver.RunPipeline = _tnl_run_pipeline;
954 /* swrast setup */
955 xmesa_register_swrast_functions( mesaCtx );
956 _swsetup_Wakeup(mesaCtx);
957
958 _mesa_meta_init(mesaCtx);
959
960 _mesa_override_extensions(mesaCtx);
961 _mesa_compute_version(mesaCtx);
962
963 /* Exec table initialization requires the version to be computed */
964 _mesa_initialize_dispatch_tables(mesaCtx);
965 _mesa_initialize_vbo_vtxfmt(mesaCtx);
966
967 return c;
968 }
969
970
971
972 PUBLIC
XMesaDestroyContext(XMesaContext c)973 void XMesaDestroyContext( XMesaContext c )
974 {
975 struct gl_context *mesaCtx = &c->mesa;
976
977 _mesa_meta_free( mesaCtx );
978
979 _swsetup_DestroyContext( mesaCtx );
980 _swrast_DestroyContext( mesaCtx );
981 _tnl_DestroyContext( mesaCtx );
982 _vbo_DestroyContext( mesaCtx );
983 _mesa_free_context_data( mesaCtx );
984 free( c );
985 }
986
987
988
989 /**
990 * Private function for creating an XMesaBuffer which corresponds to an
991 * X window or pixmap.
992 * \param v the window's XMesaVisual
993 * \param w the window we're wrapping
994 * \return new XMesaBuffer or NULL if error
995 */
996 PUBLIC XMesaBuffer
XMesaCreateWindowBuffer(XMesaVisual v,XMesaWindow w)997 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
998 {
999 XWindowAttributes attr;
1000 XMesaBuffer b;
1001 XMesaColormap cmap;
1002 int depth;
1003
1004 assert(v);
1005 assert(w);
1006
1007 /* Check that window depth matches visual depth */
1008 XGetWindowAttributes( v->display, w, &attr );
1009 depth = attr.depth;
1010 if (GET_VISUAL_DEPTH(v) != depth) {
1011 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1012 GET_VISUAL_DEPTH(v), depth);
1013 return NULL;
1014 }
1015
1016 /* Find colormap */
1017 if (attr.colormap) {
1018 cmap = attr.colormap;
1019 }
1020 else {
1021 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1022 /* this is weird, a window w/out a colormap!? */
1023 /* OK, let's just allocate a new one and hope for the best */
1024 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1025 }
1026
1027 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1028 if (!b)
1029 return NULL;
1030
1031 if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1032 xmesa_free_buffer(b);
1033 return NULL;
1034 }
1035
1036 return b;
1037 }
1038
1039
1040
1041 /**
1042 * Create a new XMesaBuffer from an X pixmap.
1043 *
1044 * \param v the XMesaVisual
1045 * \param p the pixmap
1046 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1047 * \c GLX_DIRECT_COLOR visual for the pixmap
1048 * \returns new XMesaBuffer or NULL if error
1049 */
1050 PUBLIC XMesaBuffer
XMesaCreatePixmapBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap)1051 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1052 {
1053 XMesaBuffer b;
1054
1055 assert(v);
1056
1057 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1058 if (!b)
1059 return NULL;
1060
1061 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1062 xmesa_free_buffer(b);
1063 return NULL;
1064 }
1065
1066 return b;
1067 }
1068
1069
1070 /**
1071 * For GLX_EXT_texture_from_pixmap
1072 */
1073 XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap,int format,int target,int mipmap)1074 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1075 XMesaColormap cmap,
1076 int format, int target, int mipmap)
1077 {
1078 GET_CURRENT_CONTEXT(ctx);
1079 XMesaBuffer b;
1080 GLuint width, height;
1081
1082 assert(v);
1083
1084 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1085 if (!b)
1086 return NULL;
1087
1088 /* get pixmap size, update framebuffer/renderbuffer dims */
1089 xmesa_get_window_size(v->display, b, &width, &height);
1090 _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1091
1092 if (target == 0) {
1093 /* examine dims */
1094 if (ctx->Extensions.ARB_texture_non_power_of_two) {
1095 target = GLX_TEXTURE_2D_EXT;
1096 }
1097 else if ( _mesa_bitcount(width) == 1
1098 && _mesa_bitcount(height) == 1) {
1099 /* power of two size */
1100 if (height == 1) {
1101 target = GLX_TEXTURE_1D_EXT;
1102 }
1103 else {
1104 target = GLX_TEXTURE_2D_EXT;
1105 }
1106 }
1107 else if (ctx->Extensions.NV_texture_rectangle) {
1108 target = GLX_TEXTURE_RECTANGLE_EXT;
1109 }
1110 else {
1111 /* non power of two textures not supported */
1112 XMesaDestroyBuffer(b);
1113 return 0;
1114 }
1115 }
1116
1117 b->TextureTarget = target;
1118 b->TextureFormat = format;
1119 b->TextureMipmap = mipmap;
1120
1121 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1122 xmesa_free_buffer(b);
1123 return NULL;
1124 }
1125
1126 return b;
1127 }
1128
1129
1130
1131 XMesaBuffer
XMesaCreatePBuffer(XMesaVisual v,XMesaColormap cmap,unsigned int width,unsigned int height)1132 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1133 unsigned int width, unsigned int height)
1134 {
1135 XMesaWindow root;
1136 XMesaDrawable drawable; /* X Pixmap Drawable */
1137 XMesaBuffer b;
1138
1139 /* allocate pixmap for front buffer */
1140 root = RootWindow( v->display, v->visinfo->screen );
1141 drawable = XCreatePixmap(v->display, root, width, height,
1142 v->visinfo->depth);
1143 if (!drawable)
1144 return NULL;
1145
1146 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1147 if (!b)
1148 return NULL;
1149
1150 if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1151 xmesa_free_buffer(b);
1152 return NULL;
1153 }
1154
1155 return b;
1156 }
1157
1158
1159
1160 /*
1161 * Deallocate an XMesaBuffer structure and all related info.
1162 */
1163 PUBLIC void
XMesaDestroyBuffer(XMesaBuffer b)1164 XMesaDestroyBuffer(XMesaBuffer b)
1165 {
1166 xmesa_free_buffer(b);
1167 }
1168
1169
1170 /**
1171 * Query the current window size and update the corresponding struct gl_framebuffer
1172 * and all attached renderbuffers.
1173 * Called when:
1174 * 1. the first time a buffer is bound to a context.
1175 * 2. from glViewport to poll for window size changes
1176 * 3. from the XMesaResizeBuffers() API function.
1177 * Note: it's possible (and legal) for xmctx to be NULL. That can happen
1178 * when resizing a buffer when no rendering context is bound.
1179 */
1180 void
xmesa_check_and_update_buffer_size(XMesaContext xmctx,XMesaBuffer drawBuffer)1181 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1182 {
1183 GLuint width, height;
1184 xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1185 if (drawBuffer->mesa_buffer.Width != width ||
1186 drawBuffer->mesa_buffer.Height != height) {
1187 struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1188 _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1189 }
1190 }
1191
1192
1193 /*
1194 * Bind buffer b to context c and make c the current rendering context.
1195 */
XMesaMakeCurrent(XMesaContext c,XMesaBuffer b)1196 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1197 {
1198 return XMesaMakeCurrent2( c, b, b );
1199 }
1200
1201
1202 /*
1203 * Bind buffer b to context c and make c the current rendering context.
1204 */
1205 PUBLIC
XMesaMakeCurrent2(XMesaContext c,XMesaBuffer drawBuffer,XMesaBuffer readBuffer)1206 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1207 XMesaBuffer readBuffer )
1208 {
1209 if (c) {
1210 if (!drawBuffer || !readBuffer)
1211 return GL_FALSE; /* must specify buffers! */
1212
1213 if (&(c->mesa) == _mesa_get_current_context()
1214 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1215 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1216 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1217 /* same context and buffer, do nothing */
1218 return GL_TRUE;
1219 }
1220
1221 c->xm_buffer = drawBuffer;
1222
1223 /* Call this periodically to detect when the user has begun using
1224 * GL rendering from multiple threads.
1225 */
1226 _glapi_check_multithread();
1227
1228 xmesa_check_and_update_buffer_size(c, drawBuffer);
1229 if (readBuffer != drawBuffer)
1230 xmesa_check_and_update_buffer_size(c, readBuffer);
1231
1232 _mesa_make_current(&(c->mesa),
1233 &drawBuffer->mesa_buffer,
1234 &readBuffer->mesa_buffer);
1235
1236 /*
1237 * Must recompute and set these pixel values because colormap
1238 * can be different for different windows.
1239 */
1240 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1241 c->clearcolor[0],
1242 c->clearcolor[1],
1243 c->clearcolor[2],
1244 c->clearcolor[3],
1245 c->xm_visual->undithered_pf);
1246 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1247
1248 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1249 drawBuffer->wasCurrent = GL_TRUE;
1250 }
1251 else {
1252 /* Detach */
1253 _mesa_make_current( NULL, NULL, NULL );
1254 }
1255 return GL_TRUE;
1256 }
1257
1258
1259 /*
1260 * Unbind the context c from its buffer.
1261 */
XMesaUnbindContext(XMesaContext c)1262 GLboolean XMesaUnbindContext( XMesaContext c )
1263 {
1264 /* A no-op for XFree86 integration purposes */
1265 return GL_TRUE;
1266 }
1267
1268
XMesaGetCurrentContext(void)1269 XMesaContext XMesaGetCurrentContext( void )
1270 {
1271 GET_CURRENT_CONTEXT(ctx);
1272 if (ctx) {
1273 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1274 return xmesa;
1275 }
1276 else {
1277 return 0;
1278 }
1279 }
1280
1281
XMesaGetCurrentBuffer(void)1282 XMesaBuffer XMesaGetCurrentBuffer( void )
1283 {
1284 GET_CURRENT_CONTEXT(ctx);
1285 if (ctx) {
1286 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1287 return xmbuf;
1288 }
1289 else {
1290 return 0;
1291 }
1292 }
1293
1294
1295 /* New in Mesa 3.1 */
XMesaGetCurrentReadBuffer(void)1296 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1297 {
1298 GET_CURRENT_CONTEXT(ctx);
1299 if (ctx) {
1300 return XMESA_BUFFER(ctx->ReadBuffer);
1301 }
1302 else {
1303 return 0;
1304 }
1305 }
1306
1307
XMesaGetCurrentDisplay(void)1308 Display *XMesaGetCurrentDisplay(void)
1309 {
1310 GET_CURRENT_CONTEXT(ctx);
1311 XMesaContext xmctx = XMESA_CONTEXT(ctx);
1312 return xmctx ? xmctx->display : NULL;
1313 }
1314
1315
1316
1317 /*
1318 * Copy the back buffer to the front buffer. If there's no back buffer
1319 * this is a no-op.
1320 */
1321 PUBLIC
XMesaSwapBuffers(XMesaBuffer b)1322 void XMesaSwapBuffers( XMesaBuffer b )
1323 {
1324 GET_CURRENT_CONTEXT(ctx);
1325
1326 if (!b->backxrb) {
1327 /* single buffered */
1328 return;
1329 }
1330
1331 /* If we're swapping the buffer associated with the current context
1332 * we have to flush any pending rendering commands first.
1333 */
1334 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1335 _mesa_notifySwapBuffers(ctx);
1336
1337 if (b->db_mode) {
1338 if (b->backxrb->ximage) {
1339 /* Copy Ximage (back buf) from client memory to server window */
1340 #if defined(USE_XSHM)
1341 if (b->shm) {
1342 /*mtx_lock(&_xmesa_lock);*/
1343 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1344 b->swapgc,
1345 b->backxrb->ximage, 0, 0,
1346 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1347 False );
1348 /*mtx_unlock(&_xmesa_lock);*/
1349 }
1350 else
1351 #endif
1352 {
1353 /*mtx_lock(&_xmesa_lock);*/
1354 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1355 b->swapgc,
1356 b->backxrb->ximage, 0, 0,
1357 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1358 /*mtx_unlock(&_xmesa_lock);*/
1359 }
1360 }
1361 else if (b->backxrb->pixmap) {
1362 /* Copy pixmap (back buf) to window (front buf) on server */
1363 /*mtx_lock(&_xmesa_lock);*/
1364 XMesaCopyArea( b->xm_visual->display,
1365 b->backxrb->pixmap, /* source drawable */
1366 b->frontxrb->drawable, /* dest. drawable */
1367 b->swapgc,
1368 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1369 0, 0 /* dest region */
1370 );
1371 /*mtx_unlock(&_xmesa_lock);*/
1372 }
1373 }
1374 XSync( b->xm_visual->display, False );
1375 }
1376
1377
1378
1379 /*
1380 * Copy sub-region of back buffer to front buffer
1381 */
XMesaCopySubBuffer(XMesaBuffer b,int x,int y,int width,int height)1382 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1383 {
1384 GET_CURRENT_CONTEXT(ctx);
1385
1386 /* If we're swapping the buffer associated with the current context
1387 * we have to flush any pending rendering commands first.
1388 */
1389 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1390 _mesa_notifySwapBuffers(ctx);
1391
1392 if (!b->backxrb) {
1393 /* single buffered */
1394 return;
1395 }
1396
1397 if (b->db_mode) {
1398 int yTop = b->mesa_buffer.Height - y - height;
1399 if (b->backxrb->ximage) {
1400 /* Copy Ximage from host's memory to server's window */
1401 #if defined(USE_XSHM)
1402 if (b->shm) {
1403 /* XXX assuming width and height aren't too large! */
1404 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1405 b->swapgc,
1406 b->backxrb->ximage, x, yTop,
1407 x, yTop, width, height, False );
1408 /* wait for finished event??? */
1409 }
1410 else
1411 #endif
1412 {
1413 /* XXX assuming width and height aren't too large! */
1414 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1415 b->swapgc,
1416 b->backxrb->ximage, x, yTop,
1417 x, yTop, width, height );
1418 }
1419 }
1420 else {
1421 /* Copy pixmap to window on server */
1422 XMesaCopyArea( b->xm_visual->display,
1423 b->backxrb->pixmap, /* source drawable */
1424 b->frontxrb->drawable, /* dest. drawable */
1425 b->swapgc,
1426 x, yTop, width, height, /* source region */
1427 x, yTop /* dest region */
1428 );
1429 }
1430 }
1431 }
1432
1433
1434 /*
1435 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
1436 * is a way to get "under the hood" of X/Mesa so one can manipulate the
1437 * back buffer directly.
1438 * Output: pixmap - pointer to back buffer's Pixmap, or 0
1439 * ximage - pointer to back buffer's XImage, or NULL
1440 * Return: GL_TRUE = context is double buffered
1441 * GL_FALSE = context is single buffered
1442 */
XMesaGetBackBuffer(XMesaBuffer b,XMesaPixmap * pixmap,XMesaImage ** ximage)1443 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1444 XMesaPixmap *pixmap,
1445 XMesaImage **ximage )
1446 {
1447 if (b->db_mode) {
1448 if (pixmap)
1449 *pixmap = b->backxrb->pixmap;
1450 if (ximage)
1451 *ximage = b->backxrb->ximage;
1452 return GL_TRUE;
1453 }
1454 else {
1455 *pixmap = 0;
1456 *ximage = NULL;
1457 return GL_FALSE;
1458 }
1459 }
1460
1461
1462 /*
1463 * Return the depth buffer associated with an XMesaBuffer.
1464 * Input: b - the XMesa buffer handle
1465 * Output: width, height - size of buffer in pixels
1466 * bytesPerValue - bytes per depth value (2 or 4)
1467 * buffer - pointer to depth buffer values
1468 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
1469 */
XMesaGetDepthBuffer(XMesaBuffer b,GLint * width,GLint * height,GLint * bytesPerValue,void ** buffer)1470 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1471 GLint *bytesPerValue, void **buffer )
1472 {
1473 struct gl_renderbuffer *rb
1474 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1475 struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1476
1477 if (!xrb || !xrb->Base.Buffer) {
1478 *width = 0;
1479 *height = 0;
1480 *bytesPerValue = 0;
1481 *buffer = 0;
1482 return GL_FALSE;
1483 }
1484 else {
1485 *width = b->mesa_buffer.Width;
1486 *height = b->mesa_buffer.Height;
1487 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1488 ? sizeof(GLushort) : sizeof(GLuint);
1489 *buffer = (void *) xrb->Base.Buffer;
1490 return GL_TRUE;
1491 }
1492 }
1493
1494
XMesaFlush(XMesaContext c)1495 void XMesaFlush( XMesaContext c )
1496 {
1497 if (c && c->xm_visual) {
1498 XSync( c->xm_visual->display, False );
1499 }
1500 }
1501
1502
1503
XMesaGetString(XMesaContext c,int name)1504 const char *XMesaGetString( XMesaContext c, int name )
1505 {
1506 (void) c;
1507 if (name==XMESA_VERSION) {
1508 return "5.0";
1509 }
1510 else if (name==XMESA_EXTENSIONS) {
1511 return "";
1512 }
1513 else {
1514 return NULL;
1515 }
1516 }
1517
1518
1519
XMesaFindBuffer(XMesaDisplay * dpy,XMesaDrawable d)1520 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1521 {
1522 XMesaBuffer b;
1523 for (b=XMesaBufferList; b; b=b->Next) {
1524 if (b->frontxrb->drawable == d && b->display == dpy) {
1525 return b;
1526 }
1527 }
1528 return NULL;
1529 }
1530
1531
1532 /**
1533 * Free/destroy all XMesaBuffers associated with given display.
1534 */
xmesa_destroy_buffers_on_display(XMesaDisplay * dpy)1535 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1536 {
1537 XMesaBuffer b, next;
1538 for (b = XMesaBufferList; b; b = next) {
1539 next = b->Next;
1540 if (b->display == dpy) {
1541 xmesa_free_buffer(b);
1542 }
1543 }
1544 }
1545
1546
1547 /*
1548 * Look for XMesaBuffers whose X window has been destroyed.
1549 * Deallocate any such XMesaBuffers.
1550 */
XMesaGarbageCollect(XMesaDisplay * dpy)1551 void XMesaGarbageCollect( XMesaDisplay* dpy )
1552 {
1553 XMesaBuffer b, next;
1554 for (b=XMesaBufferList; b; b=next) {
1555 next = b->Next;
1556 if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1557 XSync(b->display, False);
1558 if (!window_exists( b->display, b->frontxrb->drawable )) {
1559 /* found a dead window, free the ancillary info */
1560 XMesaDestroyBuffer( b );
1561 }
1562 }
1563 }
1564 }
1565
1566
XMesaDitherColor(XMesaContext xmesa,GLint x,GLint y,GLfloat red,GLfloat green,GLfloat blue,GLfloat alpha)1567 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1568 GLfloat red, GLfloat green,
1569 GLfloat blue, GLfloat alpha )
1570 {
1571 GLint r = (GLint) (red * 255.0F);
1572 GLint g = (GLint) (green * 255.0F);
1573 GLint b = (GLint) (blue * 255.0F);
1574 GLint a = (GLint) (alpha * 255.0F);
1575
1576 switch (xmesa->pixelformat) {
1577 case PF_Truecolor:
1578 {
1579 unsigned long p;
1580 PACK_TRUECOLOR( p, r, g, b );
1581 return p;
1582 }
1583 case PF_8A8B8G8R:
1584 return PACK_8A8B8G8R( r, g, b, a );
1585 case PF_8A8R8G8B:
1586 return PACK_8A8R8G8B( r, g, b, a );
1587 case PF_8R8G8B:
1588 return PACK_8R8G8B( r, g, b );
1589 case PF_5R6G5B:
1590 return PACK_5R6G5B( r, g, b );
1591 case PF_Dither_5R6G5B:
1592 /* fall through */
1593 case PF_Dither_True:
1594 {
1595 unsigned long p;
1596 PACK_TRUEDITHER(p, x, y, r, g, b);
1597 return p;
1598 }
1599 default:
1600 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1601 }
1602 return 0;
1603 }
1604
1605
1606 /*
1607 * This is typically called when the window size changes and we need
1608 * to reallocate the buffer's back/depth/stencil/accum buffers.
1609 */
1610 PUBLIC void
XMesaResizeBuffers(XMesaBuffer b)1611 XMesaResizeBuffers( XMesaBuffer b )
1612 {
1613 GET_CURRENT_CONTEXT(ctx);
1614 XMesaContext xmctx = XMESA_CONTEXT(ctx);
1615 if (!xmctx)
1616 return;
1617 xmesa_check_and_update_buffer_size(xmctx, b);
1618 }
1619
1620
1621 static GLint
xbuffer_to_renderbuffer(int buffer)1622 xbuffer_to_renderbuffer(int buffer)
1623 {
1624 assert(MAX_AUX_BUFFERS <= 4);
1625
1626 switch (buffer) {
1627 case GLX_FRONT_LEFT_EXT:
1628 return BUFFER_FRONT_LEFT;
1629 case GLX_FRONT_RIGHT_EXT:
1630 return BUFFER_FRONT_RIGHT;
1631 case GLX_BACK_LEFT_EXT:
1632 return BUFFER_BACK_LEFT;
1633 case GLX_BACK_RIGHT_EXT:
1634 return BUFFER_BACK_RIGHT;
1635 case GLX_AUX0_EXT:
1636 return BUFFER_AUX0;
1637 case GLX_AUX1_EXT:
1638 case GLX_AUX2_EXT:
1639 case GLX_AUX3_EXT:
1640 case GLX_AUX4_EXT:
1641 case GLX_AUX5_EXT:
1642 case GLX_AUX6_EXT:
1643 case GLX_AUX7_EXT:
1644 case GLX_AUX8_EXT:
1645 case GLX_AUX9_EXT:
1646 default:
1647 /* BadValue error */
1648 return -1;
1649 }
1650 }
1651
1652
1653 PUBLIC void
XMesaBindTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer,const int * attrib_list)1654 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1655 const int *attrib_list)
1656 {
1657 #if 0
1658 GET_CURRENT_CONTEXT(ctx);
1659 const GLuint unit = ctx->Texture.CurrentUnit;
1660 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1661 struct gl_texture_object *texObj;
1662 #endif
1663 struct gl_renderbuffer *rb;
1664 struct xmesa_renderbuffer *xrb;
1665 GLint b;
1666 XMesaImage *img = NULL;
1667 GLboolean freeImg = GL_FALSE;
1668
1669 b = xbuffer_to_renderbuffer(buffer);
1670 if (b < 0)
1671 return;
1672
1673 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1674 return; /* BadMatch error */
1675
1676 rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1677 if (!rb) {
1678 /* invalid buffer */
1679 return;
1680 }
1681 xrb = xmesa_renderbuffer(rb);
1682
1683 #if 0
1684 switch (drawable->TextureTarget) {
1685 case GLX_TEXTURE_1D_EXT:
1686 texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1687 break;
1688 case GLX_TEXTURE_2D_EXT:
1689 texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1690 break;
1691 case GLX_TEXTURE_RECTANGLE_EXT:
1692 texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1693 break;
1694 default:
1695 return; /* BadMatch error */
1696 }
1697 #endif
1698
1699 /*
1700 * The following is a quick and simple way to implement
1701 * BindTexImage. The better way is to write some new FetchTexel()
1702 * functions which would extract texels from XImages. We'd still
1703 * need to use GetImage when texturing from a Pixmap (front buffer)
1704 * but texturing from a back buffer (XImage) would avoid an image
1705 * copy.
1706 */
1707
1708 /* get XImage */
1709 if (xrb->pixmap) {
1710 img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1711 ZPixmap);
1712 freeImg = GL_TRUE;
1713 }
1714 else if (xrb->ximage) {
1715 img = xrb->ximage;
1716 }
1717
1718 /* store the XImage as a new texture image */
1719 if (img) {
1720 GLenum format, type, intFormat;
1721 if (img->bits_per_pixel == 32) {
1722 format = GL_BGRA;
1723 type = GL_UNSIGNED_BYTE;
1724 intFormat = GL_RGBA;
1725 }
1726 else if (img->bits_per_pixel == 24) {
1727 format = GL_BGR;
1728 type = GL_UNSIGNED_BYTE;
1729 intFormat = GL_RGB;
1730 }
1731 else if (img->bits_per_pixel == 16) {
1732 format = GL_BGR;
1733 type = GL_UNSIGNED_SHORT_5_6_5;
1734 intFormat = GL_RGB;
1735 }
1736 else {
1737 _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1738 return;
1739 }
1740 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1741 intFormat = GL_RGBA;
1742 }
1743 else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1744 intFormat = GL_RGB;
1745 }
1746
1747 _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1748 format, type, img->data);
1749
1750 if (freeImg) {
1751 XMesaDestroyImage(img);
1752 }
1753 }
1754 }
1755
1756
1757
1758 PUBLIC void
XMesaReleaseTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer)1759 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1760 {
1761 const GLint b = xbuffer_to_renderbuffer(buffer);
1762 if (b < 0)
1763 return;
1764
1765 /* no-op for now */
1766 }
1767
1768