summaryrefslogtreecommitdiff
path: root/progs/xdemos/pbutil.c
blob: 479abc983caa048966f0ee56d5c075f3ba57b3b8 (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

/*
 * OpenGL pbuffers utility functions.
 *
 * Brian Paul
 * Original code: April 1997
 * Updated on 5 October 2002
 * Updated again on 3 January 2005 to use GLX 1.3 functions in preference
 * to the GLX_SGIX_fbconfig/pbuffer extensions.
 */


#include <stdio.h>
#include <string.h>
#include "pbutil.h"


/**
 * Test if we pixel buffers are available for a particular X screen.
 * Input:  dpy - the X display
 *         screen - screen number
 * Return:  0 = pixel buffers not available.
 *          1 = pixel buffers are available via GLX 1.3.
 *          2 = pixel buffers are available via GLX_SGIX_fbconfig/pbuffer.
 */
int
QueryPbuffers(Display *dpy, int screen)
{
#if defined(GLX_VERSION_1_3)
   {
      /* GLX 1.3 supports pbuffers */
      int glxVersionMajor, glxVersionMinor;
      if (!glXQueryVersion(dpy, &glxVersionMajor, &glxVersionMinor)) {
         /* GLX not available! */
         return 0;
      }
      if (glxVersionMajor * 100 + glxVersionMinor >= 103) {
         return 1;
      }
      /* fall-through */
   }
#endif

#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   /* Try the SGIX extensions */
   {
      char *extensions;
      extensions = (char *) glXQueryServerString(dpy, screen, GLX_EXTENSIONS);
      if (!extensions ||
          !strstr(extensions,"GLX_SGIX_fbconfig") ||
          !strstr(extensions,"GLX_SGIX_pbuffer")) {
         return 0;
      }
      return 2;
   }
#endif

   return 0;
}



FBCONFIG *
ChooseFBConfig(Display *dpy, int screen, const int attribs[], int *nConfigs)
{
   int pbSupport = QueryPbuffers(dpy, screen);
#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      return glXChooseFBConfig(dpy, screen, attribs, nConfigs);
   }
#endif
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      return glXChooseFBConfigSGIX(dpy, screen, (int *) attribs, nConfigs);
   }
#endif
   return NULL;
}


FBCONFIG *
GetAllFBConfigs(Display *dpy, int screen, int *nConfigs)
{
   int pbSupport = QueryPbuffers(dpy, screen);
#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      return glXGetFBConfigs(dpy, screen, nConfigs);
   }
#endif
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      /* The GLX_SGIX_fbconfig extensions says to pass NULL to get list
       * of all available configurations.
       */
      return glXChooseFBConfigSGIX(dpy, screen, NULL, nConfigs);
   }
#endif
   return NULL;
}


XVisualInfo *
GetVisualFromFBConfig(Display *dpy, int screen, FBCONFIG config)
{
   int pbSupport = QueryPbuffers(dpy, screen);
#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      return glXGetVisualFromFBConfig(dpy, config);
   }
#endif
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      return glXGetVisualFromFBConfigSGIX(dpy, config);
   }
#endif
   return NULL;
}


/**
 * Either use glXGetFBConfigAttrib() or glXGetFBConfigAttribSGIX()
 * to query an fbconfig attribute.
 */
static int
GetFBConfigAttrib(Display *dpy, int screen,
#if defined(GLX_VERSION_1_3)
                  const GLXFBConfig config,
#elif defined(GLX_SGIX_fbconfig)
                  const GLXFBConfigSGIX config,
#endif
                  int attrib
                  )
{
   int pbSupport = QueryPbuffers(dpy, screen);
   int value = 0;

#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      /* ok */
      if (glXGetFBConfigAttrib(dpy, config, attrib, &value) != 0) {
         value = 0;
      }
      return value;
   }
   /* fall-through */
#endif

#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      if (glXGetFBConfigAttribSGIX(dpy, config, attrib, &value) != 0) {
         value = 0;
      }
      return value;
   }
#endif
   
   return value;
}



/**
 * Print parameters for a GLXFBConfig to stdout.
 * Input:  dpy - the X display
 *         screen - the X screen number
 *         fbConfig - the fbconfig handle
 *         horizFormat - if true, print in horizontal format
 */
void
PrintFBConfigInfo(Display *dpy, int screen, FBCONFIG config, Bool horizFormat)
{
   PBUFFER pBuffer;
   int width=2, height=2;
   int bufferSize, level, doubleBuffer, stereo, auxBuffers;
   int redSize, greenSize, blueSize, alphaSize;
   int depthSize, stencilSize;
   int accumRedSize, accumBlueSize, accumGreenSize, accumAlphaSize;
   int sampleBuffers, samples;
   int drawableType, renderType, xRenderable, xVisual, id;
   int maxWidth, maxHeight, maxPixels;
   int optWidth, optHeight;
   int floatComponents = 0;

   /* do queries using the GLX 1.3 tokens (same as the SGIX tokens) */
   bufferSize     = GetFBConfigAttrib(dpy, screen, config, GLX_BUFFER_SIZE);
   level          = GetFBConfigAttrib(dpy, screen, config, GLX_LEVEL);
   doubleBuffer   = GetFBConfigAttrib(dpy, screen, config, GLX_DOUBLEBUFFER);
   stereo         = GetFBConfigAttrib(dpy, screen, config, GLX_STEREO);
   auxBuffers     = GetFBConfigAttrib(dpy, screen, config, GLX_AUX_BUFFERS);
   redSize        = GetFBConfigAttrib(dpy, screen, config, GLX_RED_SIZE);
   greenSize      = GetFBConfigAttrib(dpy, screen, config, GLX_GREEN_SIZE);
   blueSize       = GetFBConfigAttrib(dpy, screen, config, GLX_BLUE_SIZE);
   alphaSize      = GetFBConfigAttrib(dpy, screen, config, GLX_ALPHA_SIZE);
   depthSize      = GetFBConfigAttrib(dpy, screen, config, GLX_DEPTH_SIZE);
   stencilSize    = GetFBConfigAttrib(dpy, screen, config, GLX_STENCIL_SIZE);
   accumRedSize   = GetFBConfigAttrib(dpy, screen, config, GLX_ACCUM_RED_SIZE);
   accumGreenSize = GetFBConfigAttrib(dpy, screen, config, GLX_ACCUM_GREEN_SIZE);
   accumBlueSize  = GetFBConfigAttrib(dpy, screen, config, GLX_ACCUM_BLUE_SIZE);
   accumAlphaSize = GetFBConfigAttrib(dpy, screen, config, GLX_ACCUM_ALPHA_SIZE);
   sampleBuffers  = GetFBConfigAttrib(dpy, screen, config, GLX_SAMPLE_BUFFERS);
   samples        = GetFBConfigAttrib(dpy, screen, config, GLX_SAMPLES);
   drawableType   = GetFBConfigAttrib(dpy, screen, config, GLX_DRAWABLE_TYPE);
   renderType     = GetFBConfigAttrib(dpy, screen, config, GLX_RENDER_TYPE);
   xRenderable    = GetFBConfigAttrib(dpy, screen, config, GLX_X_RENDERABLE);
   xVisual        = GetFBConfigAttrib(dpy, screen, config, GLX_X_VISUAL_TYPE);
   if (!xRenderable || !(drawableType & GLX_WINDOW_BIT_SGIX))
      xVisual = -1;

   id        = GetFBConfigAttrib(dpy, screen, config, GLX_FBCONFIG_ID);
   maxWidth  = GetFBConfigAttrib(dpy, screen, config, GLX_MAX_PBUFFER_WIDTH);
   maxHeight = GetFBConfigAttrib(dpy, screen, config, GLX_MAX_PBUFFER_HEIGHT);
   maxPixels = GetFBConfigAttrib(dpy, screen, config, GLX_MAX_PBUFFER_PIXELS);
#if defined(GLX_SGIX_pbuffer)
   optWidth  = GetFBConfigAttrib(dpy, screen, config, GLX_OPTIMAL_PBUFFER_WIDTH_SGIX);
   optHeight = GetFBConfigAttrib(dpy, screen, config, GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX);
#else
   optWidth = optHeight = 0;
#endif
#if defined(GLX_NV_float_buffer)
   floatComponents = GetFBConfigAttrib(dpy, screen, config, GLX_FLOAT_COMPONENTS_NV);
#endif

   /* See if we can create a pbuffer with this config */
   pBuffer = CreatePbuffer(dpy, screen, config, width, height, False, False);

   if (horizFormat) {
      printf("0x%-9x ", id);
      if (xVisual==GLX_STATIC_GRAY)        printf("StaticGray  ");
      else if (xVisual==GLX_GRAY_SCALE)    printf("GrayScale   ");
      else if (xVisual==GLX_STATIC_COLOR)  printf("StaticColor ");
      else if (xVisual==GLX_PSEUDO_COLOR)  printf("PseudoColor ");
      else if (xVisual==GLX_TRUE_COLOR)    printf("TrueColor   ");
      else if (xVisual==GLX_DIRECT_COLOR)  printf("DirectColor ");
      else                            printf("  -none-    ");
      printf(" %3d %3d   %s   %s  %s   %2s   ", bufferSize, level,
	     (renderType & GLX_RGBA_BIT_SGIX) ? "y" : ".",
	     (renderType & GLX_COLOR_INDEX_BIT_SGIX) ? "y" : ".",
	     doubleBuffer ? "y" : ".",
	     stereo ? "y" : ".");
      printf("%2d %2d %2d %2d  ", redSize, greenSize, blueSize, alphaSize);
      printf("%2d %2d  ", depthSize, stencilSize);
      printf("%2d %2d %2d %2d", accumRedSize, accumGreenSize, accumBlueSize,
	     accumAlphaSize);
      printf("    %2d    %2d", sampleBuffers, samples);
      printf("       %s       %c", pBuffer ? "y" : ".",
             ".y"[floatComponents]);
      printf("\n");
   }
   else {
      printf("Id 0x%x\n", id);
      printf("  Buffer Size: %d\n", bufferSize);
      printf("  Level: %d\n", level);
      printf("  Double Buffer: %s\n", doubleBuffer ? "yes" : "no");
      printf("  Stereo: %s\n", stereo ? "yes" : "no");
      printf("  Aux Buffers: %d\n", auxBuffers);
      printf("  Red Size: %d\n", redSize);
      printf("  Green Size: %d\n", greenSize);
      printf("  Blue Size: %d\n", blueSize);
      printf("  Alpha Size: %d\n", alphaSize);
      printf("  Depth Size: %d\n", depthSize);
      printf("  Stencil Size: %d\n", stencilSize);
      printf("  Accum Red Size: %d\n", accumRedSize);
      printf("  Accum Green Size: %d\n", accumGreenSize);
      printf("  Accum Blue Size: %d\n", accumBlueSize);
      printf("  Accum Alpha Size: %d\n", accumAlphaSize);
      printf("  Sample Buffers: %d\n", sampleBuffers);
      printf("  Samples/Pixel: %d\n", samples);
      printf("  Drawable Types: ");
      if (drawableType & GLX_WINDOW_BIT)  printf("Window ");
      if (drawableType & GLX_PIXMAP_BIT)  printf("Pixmap ");
      if (drawableType & GLX_PBUFFER_BIT)  printf("PBuffer");
      printf("\n");
      printf("  Render Types: ");
      if (renderType & GLX_RGBA_BIT_SGIX)  printf("RGBA ");
      if (renderType & GLX_COLOR_INDEX_BIT_SGIX)  printf("CI ");
      printf("\n");
      printf("  X Renderable: %s\n", xRenderable ? "yes" : "no");

      printf("  Pbuffer: %s\n", pBuffer ? "yes" : "no");
      printf("  Max Pbuffer width: %d\n", maxWidth);
      printf("  Max Pbuffer height: %d\n", maxHeight);
      printf("  Max Pbuffer pixels: %d\n", maxPixels);
      printf("  Optimum Pbuffer width: %d\n", optWidth);
      printf("  Optimum Pbuffer height: %d\n", optHeight);

      printf("  Float Components: %s\n", floatComponents ? "yes" : "no");
   }

   if (pBuffer) {
      DestroyPbuffer(dpy, screen, pBuffer);
   }
}



/* This is only used by CreatePbuffer() */
static int XErrorFlag = 0;
static int HandleXError(Display *dpy, XErrorEvent *event)
{
    XErrorFlag = 1;
    return 0;
}


/**
 * Create a Pbuffer.  Use an X error handler to deal with potential
 * BadAlloc errors.
 *
 * Input:  dpy - the X display
 *         fbConfig - an FBConfig as returned by glXChooseFBConfigSGIX().
 *         width, height - size of pixel buffer to request, in pixels.
 *         pbAttribs - list of optional pixel buffer attributes
 * Return:  a Pbuffer or None.
 */
PBUFFER
CreatePbuffer(Display *dpy, int screen, FBCONFIG config,
              int width, int height, Bool largest, Bool preserve)
{
   int (*oldHandler)(Display *, XErrorEvent *);
   PBUFFER pBuffer = None;
   int pbSupport = QueryPbuffers(dpy, screen);

   /* Catch X protocol errors with our own error handler */
   oldHandler = XSetErrorHandler(HandleXError);
   XErrorFlag = 0;

#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      /* GLX 1.3 */
      int attribs[100], i = 0;
      attribs[i++] = GLX_PBUFFER_WIDTH;
      attribs[i++] = width;
      attribs[i++] = GLX_PBUFFER_HEIGHT;
      attribs[i++] = height;
      attribs[i++] = GLX_PRESERVED_CONTENTS;
      attribs[i++] = preserve;
      attribs[i++] = GLX_LARGEST_PBUFFER;
      attribs[i++] = largest;
      attribs[i++] = 0;
      pBuffer = glXCreatePbuffer(dpy, config, attribs);
   }
   else
#endif
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      int attribs[100], i = 0;
      attribs[i++] = GLX_PRESERVED_CONTENTS;
      attribs[i++] = preserve;
      attribs[i++] = GLX_LARGEST_PBUFFER;
      attribs[i++] = largest;
      attribs[i++] = 0;
      pBuffer = glXCreateGLXPbufferSGIX(dpy, config, width, height, attribs);
   }
   else
#endif
   {
      pBuffer = None;
   }

   /* Restore original X error handler */
   (void) XSetErrorHandler(oldHandler);

   /* Return pbuffer (may be None) */
   if (!XErrorFlag && pBuffer != None) {
      /*printf("config %d worked!\n", i);*/
      return pBuffer;
   }
   else {
      return None;
   }
}


void
DestroyPbuffer(Display *dpy, int screen, PBUFFER pbuffer)
{
   int pbSupport = QueryPbuffers(dpy, screen);
#if defined(GLX_VERSION_1_3)
   if (pbSupport == 1) {
      glXDestroyPbuffer(dpy, pbuffer);
      return;
   }
#endif
#if defined(GLX_SGIX_fbconfig) && defined(GLX_SGIX_pbuffer)
   if (pbSupport == 2) {
      glXDestroyGLXPbufferSGIX(dpy, pbuffer);
      return;
   }
#endif
}