summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/x11/xm_buffer.c
blob: 821e2a8e082e42198d0655836f2e080192865708 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*
 * Mesa 3-D graphics library
 * Version:  6.5.2
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


/**
 * \file xm_buffer.h
 * Framebuffer and renderbuffer-related functions.
 */


#include "glxheader.h"
#include "xmesaP.h"
#include "main/imports.h"
#include "main/framebuffer.h"
#include "main/renderbuffer.h"


#if defined(USE_XSHM) && !defined(XFree86Server)
static volatile int mesaXErrorFlag = 0;

/**
 * Catches potential Xlib errors.
 */
static int
mesaHandleXError(XMesaDisplay *dpy, XErrorEvent *event)
{
   (void) dpy;
   (void) event;
   mesaXErrorFlag = 1;
   return 0;
}

/**
 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
 * Return:  GL_TRUE if success, GL_FALSE if error
 */
static GLboolean
alloc_back_shm_ximage(XMesaBuffer b, GLuint width, GLuint height)
{
   /*
    * We have to do a _lot_ of error checking here to be sure we can
    * really use the XSHM extension.  It seems different servers trigger
    * errors at different points if the extension won't work.  Therefore
    * we have to be very careful...
    */
   GC gc;
   int (*old_handler)(XMesaDisplay *, XErrorEvent *);

   if (width == 0 || height == 0) {
      /* this will be true the first time we're called on 'b' */
      return GL_FALSE;
   }

   b->backxrb->ximage = XShmCreateImage(b->xm_visual->display,
                                        b->xm_visual->visinfo->visual,
                                        b->xm_visual->visinfo->depth,
                                        ZPixmap, NULL, &b->shminfo,
                                        width, height);
   if (b->backxrb->ximage == NULL) {
      _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.\n");
      b->shm = 0;
      return GL_FALSE;
   }

   b->shminfo.shmid = shmget(IPC_PRIVATE, b->backxrb->ximage->bytes_per_line
			     * b->backxrb->ximage->height, IPC_CREAT|0777);
   if (b->shminfo.shmid < 0) {
      _mesa_warning(NULL, "shmget failed while allocating back buffer.\n");
      XDestroyImage(b->backxrb->ximage);
      b->backxrb->ximage = NULL;
      _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.\n");
      b->shm = 0;
      return GL_FALSE;
   }

   b->shminfo.shmaddr = b->backxrb->ximage->data
                      = (char*)shmat(b->shminfo.shmid, 0, 0);
   if (b->shminfo.shmaddr == (char *) -1) {
      _mesa_warning(NULL, "shmat() failed while allocating back buffer.\n");
      XDestroyImage(b->backxrb->ximage);
      shmctl(b->shminfo.shmid, IPC_RMID, 0);
      b->backxrb->ximage = NULL;
      _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.\n");
      b->shm = 0;
      return GL_FALSE;
   }

   b->shminfo.readOnly = False;
   mesaXErrorFlag = 0;
   old_handler = XSetErrorHandler(mesaHandleXError);
   /* This may trigger the X protocol error we're ready to catch: */
   XShmAttach(b->xm_visual->display, &b->shminfo);
   XSync(b->xm_visual->display, False);

   if (mesaXErrorFlag) {
      /* we are on a remote display, this error is normal, don't print it */
      XFlush(b->xm_visual->display);
      mesaXErrorFlag = 0;
      XDestroyImage(b->backxrb->ximage);
      shmdt(b->shminfo.shmaddr);
      shmctl(b->shminfo.shmid, IPC_RMID, 0);
      b->backxrb->ximage = NULL;
      b->shm = 0;
      (void) XSetErrorHandler(old_handler);
      return GL_FALSE;
   }

   shmctl(b->shminfo.shmid, IPC_RMID, 0); /* nobody else needs it */

   /* Finally, try an XShmPutImage to be really sure the extension works */
   gc = XCreateGC(b->xm_visual->display, b->frontxrb->drawable, 0, NULL);
   XShmPutImage(b->xm_visual->display, b->frontxrb->drawable, gc,
		 b->backxrb->ximage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False);
   XSync(b->xm_visual->display, False);
   XFreeGC(b->xm_visual->display, gc);
   (void) XSetErrorHandler(old_handler);
   if (mesaXErrorFlag) {
      XFlush(b->xm_visual->display);
      mesaXErrorFlag = 0;
      XDestroyImage(b->backxrb->ximage);
      shmdt(b->shminfo.shmaddr);
      shmctl(b->shminfo.shmid, IPC_RMID, 0);
      b->backxrb->ximage = NULL;
      b->shm = 0;
      return GL_FALSE;
   }

   return GL_TRUE;
}
#else
static GLboolean
alloc_back_shm_ximage(XMesaBuffer b, GLuint width, GLuint height)
{
   /* Can't compile XSHM support */
   return GL_FALSE;
}
#endif



/**
 * Setup an off-screen pixmap or Ximage to use as the back buffer.
 * Input:  b - the X/Mesa buffer
 */
static void
alloc_back_buffer(XMesaBuffer b, GLuint width, GLuint height)
{
   if (b->db_mode == BACK_XIMAGE) {
      /* Deallocate the old backxrb->ximage, if any */
      if (b->backxrb->ximage) {
#if defined(USE_XSHM) && !defined(XFree86Server)
	 if (b->shm) {
	    XShmDetach(b->xm_visual->display, &b->shminfo);
	    XDestroyImage(b->backxrb->ximage);
	    shmdt(b->shminfo.shmaddr);
	 }
	 else
#endif
	   XMesaDestroyImage(b->backxrb->ximage);
	 b->backxrb->ximage = NULL;
      }

      if (width == 0 || height == 0)
         return;

      /* Allocate new back buffer */
      if (b->shm == 0 || !alloc_back_shm_ximage(b, width, height)) {
	 /* Allocate a regular XImage for the back buffer. */
#ifdef XFree86Server
	 b->backxrb->ximage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
                                               width, height, NULL);
#else
	 b->backxrb->ximage = XCreateImage(b->xm_visual->display,
                                      b->xm_visual->visinfo->visual,
                                      GET_VISUAL_DEPTH(b->xm_visual),
				      ZPixmap, 0,   /* format, offset */
				      NULL,
                                      width, height,
				      8, 0);  /* pad, bytes_per_line */
#endif
	 if (!b->backxrb->ximage) {
	    _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.\n");
            return;
	 }
         b->backxrb->ximage->data = (char *) MALLOC(b->backxrb->ximage->height
                                        * b->backxrb->ximage->bytes_per_line);
         if (!b->backxrb->ximage->data) {
            _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.\n");
            XMesaDestroyImage(b->backxrb->ximage);
            b->backxrb->ximage = NULL;
         }
      }
      b->backxrb->pixmap = None;
   }
   else if (b->db_mode == BACK_PIXMAP) {
      /* Free the old back pixmap */
      if (b->backxrb->pixmap) {
         XMesaFreePixmap(b->xm_visual->display, b->backxrb->pixmap);
         b->backxrb->pixmap = 0;
      }

      if (width > 0 && height > 0) {
         /* Allocate new back pixmap */
         b->backxrb->pixmap = XMesaCreatePixmap(b->xm_visual->display,
                                                b->frontxrb->drawable,
                                                width, height,
                                                GET_VISUAL_DEPTH(b->xm_visual));
      }

      b->backxrb->ximage = NULL;
      b->backxrb->drawable = b->backxrb->pixmap;
   }
}


static void
xmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
   /* XXX Note: the ximage or Pixmap attached to this renderbuffer
    * should probably get freed here, but that's currently done in
    * XMesaDestroyBuffer().
    */
   _mesa_free(rb);
}


/**
 * Reallocate renderbuffer storage for front color buffer.
 * Called via gl_renderbuffer::AllocStorage()
 */
static GLboolean
xmesa_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                          GLenum internalFormat, GLuint width, GLuint height)
{
   struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);

   /* just clear these to be sure we don't accidentally use them */
   xrb->origin1 = NULL;
   xrb->origin2 = NULL;
   xrb->origin3 = NULL;
   xrb->origin4 = NULL;

   /* for the FLIP macro: */
   xrb->bottom = height - 1;

   rb->Width = width;
   rb->Height = height;
   rb->InternalFormat = internalFormat;

   return GL_TRUE;
}


/**
 * Reallocate renderbuffer storage for back color buffer.
 * Called via gl_renderbuffer::AllocStorage()
 */
static GLboolean
xmesa_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                         GLenum internalFormat, GLuint width, GLuint height)
{
   struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);

   /* reallocate the back buffer XImage or Pixmap */
   assert(xrb->Parent);
   alloc_back_buffer(xrb->Parent, width, height);

   /* same as front buffer */
   /* XXX why is this here? */
   (void) xmesa_alloc_front_storage(ctx, rb, internalFormat, width, height);

   /* plus... */
   if (xrb->ximage) {
      /* Needed by PIXELADDR1 macro */
      xrb->width1 = xrb->ximage->bytes_per_line;
      xrb->origin1 = (GLubyte *) xrb->ximage->data + xrb->width1 * (height - 1);

      /* Needed by PIXELADDR2 macro */
      xrb->width2 = xrb->ximage->bytes_per_line / 2;
      xrb->origin2 = (GLushort *) xrb->ximage->data + xrb->width2 * (height - 1);

      /* Needed by PIXELADDR3 macro */
      xrb->width3 = xrb->ximage->bytes_per_line;
      xrb->origin3 = (GLubyte *) xrb->ximage->data + xrb->width3 * (height - 1);

      /* Needed by PIXELADDR4 macro */
      xrb->width4 = xrb->ximage->width;
      xrb->origin4 = (GLuint *) xrb->ximage->data + xrb->width4 * (height - 1);
   }
   else {
      /* out of memory or buffer size is 0 x 0 */
      xrb->width1 = xrb->width2 = xrb->width3 = xrb->width4 = 0;
      xrb->origin1 = NULL;
      xrb->origin2 = NULL;
      xrb->origin3 = NULL;
      xrb->origin4 = NULL;
   }

   return GL_TRUE;
}


struct xmesa_renderbuffer *
xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, const GLvisual *visual,
                       GLboolean backBuffer)
{
   struct xmesa_renderbuffer *xrb = CALLOC_STRUCT(xmesa_renderbuffer);
   if (xrb) {
      GLuint name = 0;
      _mesa_init_renderbuffer(&xrb->Base, name);

      xrb->Base.Delete = xmesa_delete_renderbuffer;
      if (backBuffer)
         xrb->Base.AllocStorage = xmesa_alloc_back_storage;
      else
         xrb->Base.AllocStorage = xmesa_alloc_front_storage;

      if (visual->rgbMode) {
         xrb->Base.InternalFormat = GL_RGBA;
         xrb->Base._BaseFormat = GL_RGBA;
         xrb->Base.DataType = GL_UNSIGNED_BYTE;
         xrb->Base.RedBits = visual->redBits;
         xrb->Base.GreenBits = visual->greenBits;
         xrb->Base.BlueBits = visual->blueBits;
         xrb->Base.AlphaBits = visual->alphaBits;
      }
      else {
         xrb->Base.InternalFormat = GL_COLOR_INDEX;
         xrb->Base._BaseFormat = GL_COLOR_INDEX;
         xrb->Base.DataType = GL_UNSIGNED_INT;
         xrb->Base.IndexBits = visual->indexBits;
      }
      /* only need to set Red/Green/EtcBits fields for user-created RBs */
   }
   return xrb;
}


/**
 * Called via gl_framebuffer::Delete() method when this buffer
 * is _really_ being deleted.
 */
void
xmesa_delete_framebuffer(struct gl_framebuffer *fb)
{
   XMesaBuffer b = XMESA_BUFFER(fb);

   if (b->num_alloced > 0) {
      /* If no other buffer uses this X colormap then free the colors. */
      if (!xmesa_find_buffer(b->display, b->cmap, b)) {
#ifdef XFree86Server
         int client = 0;
         if (b->frontxrb->drawable)
            client = CLIENT_ID(b->frontxrb->drawable->id);
         (void)FreeColors(b->cmap, client,
                          b->num_alloced, b->alloced_colors, 0);
#else
         XFreeColors(b->display, b->cmap,
                     b->alloced_colors, b->num_alloced, 0);
#endif
      }
   }

   if (b->gc)
      XMesaFreeGC(b->display, b->gc);
   if (b->cleargc)
      XMesaFreeGC(b->display, b->cleargc);
   if (b->swapgc)
      XMesaFreeGC(b->display, b->swapgc);

   if (fb->Visual.doubleBufferMode) {
      /* free back ximage/pixmap/shmregion */
      if (b->backxrb->ximage) {
#if defined(USE_XSHM) && !defined(XFree86Server)
         if (b->shm) {
            XShmDetach( b->display, &b->shminfo );
            XDestroyImage( b->backxrb->ximage );
            shmdt( b->shminfo.shmaddr );
         }
         else
#endif
            XMesaDestroyImage( b->backxrb->ximage );
         b->backxrb->ximage = NULL;
      }
      if (b->backxrb->pixmap) {
         XMesaFreePixmap( b->display, b->backxrb->pixmap );
         if (b->xm_visual->hpcr_clear_flag) {
            XMesaFreePixmap( b->display,
                             b->xm_visual->hpcr_clear_pixmap );
            XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
         }
      }
   }

   if (b->rowimage) {
      _mesa_free( b->rowimage->data );
      b->rowimage->data = NULL;
      XMesaDestroyImage( b->rowimage );
   }

   _mesa_free_framebuffer_data(fb);
   _mesa_free(fb);
}