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1 | |
2 | @c %start of fragment | |
3 | ||
4 | @copying | |
5 | This section of the manual was derived from the upstream OpenGL | |
6 | documentation. Each function's documentation has its own copyright | |
7 | statement; for full details, see the upstream documentation. The | |
8 | copyright notices and licenses present in this section are as follows. | |
9 | ||
10 | Copyright @copyright{} 1991-2006 Silicon Graphics, Inc. This document is | |
11 | licensed under the SGI Free Software B License. For details, see | |
12 | @uref{http://oss.sgi.com/projects/FreeB/,http://oss.sgi.com/projects/FreeB/}. | |
13 | ||
14 | @end copying | |
15 | ||
16 | The functions from this section may be had by loading the module: | |
17 | ||
18 | @example | |
19 | (use-modules (figl low-level glx)) | |
20 | @end example | |
21 | ||
22 | @defun glXChooseFBConfig | |
23 | @heading return a list of GLX frame buffer configurations that match the specified attributes | |
24 | @heading Parameters | |
25 | @table @asis | |
26 | @item @var{dpy} | |
27 | Specifies the connection to the X server. | |
28 | ||
29 | @item @var{screen} | |
30 | Specifies the screen number. | |
31 | ||
32 | @item @var{attrib_list} | |
33 | Specifies a list of attribute/value pairs. The last attribute must be | |
34 | @code{None}. | |
35 | ||
36 | @item @var{nelements} | |
37 | Returns the number of elements in the list returned by | |
38 | @code{glXChooseFBConfig}. | |
39 | ||
40 | @end table | |
41 | ||
42 | @heading Description | |
43 | @code{glXChooseFBConfig} returns GLX frame buffer configurations that | |
44 | match the attributes specified in @var{attrib_list}, or @code{NULL} if | |
45 | no matches are found. If @var{attrib_list} is @code{NULL}, then | |
46 | @code{glXChooseFBConfig} returns an array of GLX frame buffer | |
47 | configurations that are available on the specified screen. If an error | |
48 | occurs, no frame buffer configurations exist on the specified screen, or | |
49 | if no frame buffer configurations match the specified attributes, then | |
50 | @code{NULL} is returned. Use @code{XFree} to free the memory returned by | |
51 | @code{glXChooseFBConfig}. | |
52 | ||
53 | All attributes in @var{attrib_list}, including boolean attributes, are | |
54 | immediately followed by the corresponding desired value. The list is | |
55 | terminated with @code{None}. If an attribute is not specified in | |
56 | @var{attrib_list}, then the default value (see below) is used (and the | |
57 | attribute is said to be specified implicitly). For example, if | |
58 | @code{GLX_STEREO} is not specified, then it is assumed to be | |
59 | @code{False}. For some attributes, the default is @code{GLX_DONT_CARE}, | |
60 | meaning that any value is OK for this attribute, so the attribute will | |
61 | not be checked. | |
62 | ||
63 | Attributes are matched in an attribute-specific manner. Some of the | |
64 | attributes, such as @code{GLX_LEVEL}, must match the specified value | |
65 | exactly; others, such as, @code{GLX_RED_SIZE} must meet or exceed the | |
66 | specified minimum values. If more than one GLX frame buffer | |
67 | configuration is found, then a list of configurations, sorted according | |
68 | to the ``best'' match criteria, is returned. The match criteria for each | |
69 | attribute and the exact sorting order is defined below. | |
70 | ||
71 | The interpretations of the various GLX visual attributes are as follows: | |
72 | ||
73 | @table @asis | |
74 | @item @code{GLX_FBCONFIG_ID} | |
75 | ||
76 | ||
77 | Must be followed by a valid XID that indicates the desired GLX frame | |
78 | buffer configuration. When a @code{GLX_FBCONFIG_ID} is specified, all | |
79 | attributes are ignored. The default value is @code{GLX_DONT_CARE}. | |
80 | ||
81 | @item @code{GLX_BUFFER_SIZE} | |
82 | ||
83 | ||
84 | Must be followed by a nonnegative integer that indicates the desired | |
85 | color index buffer size. The smallest index buffer of at least the | |
86 | specified size is preferred. This attribute is ignored if | |
87 | @code{GLX_COLOR_INDEX_BIT} is not set in @code{GLX_RENDER_TYPE}. The | |
88 | default value is 0. | |
89 | ||
90 | @item @code{GLX_LEVEL} | |
91 | ||
92 | ||
93 | Must be followed by an integer buffer-level specification. This | |
94 | specification is honored exactly. Buffer level 0 corresponds to the | |
95 | default frame buffer of the display. Buffer level 1 is the first overlay | |
96 | frame buffer, level two the second overlay frame buffer, and so on. | |
97 | Negative buffer levels correspond to underlay frame buffers. The default | |
98 | value is 0. | |
99 | ||
100 | @item @code{GLX_DOUBLEBUFFER} | |
101 | ||
102 | ||
103 | Must be followed by @code{True} or @code{False}. If @code{True} is | |
104 | specified, then only double-buffered frame buffer configurations are | |
105 | considered; if @code{False} is specified, then only single-buffered | |
106 | frame buffer configurations are considered. The default value is | |
107 | @code{GLX_DONT_CARE}. | |
108 | ||
109 | @item @code{GLX_STEREO} | |
110 | ||
111 | ||
112 | Must be followed by @code{True} or @code{False}. If @code{True} is | |
113 | specified, then only stereo frame buffer configurations are considered; | |
114 | if @code{False} is specified, then only monoscopic frame buffer | |
115 | configurations are considered. The default value is @code{False}. | |
116 | ||
117 | @item @code{GLX_AUX_BUFFERS} | |
118 | ||
119 | ||
120 | Must be followed by a nonnegative integer that indicates the desired | |
121 | number of auxiliary buffers. Configurations with the smallest number of | |
122 | auxiliary buffers that meet or exceed the specified number are | |
123 | preferred. The default value is 0. | |
124 | ||
125 | @item @code{GLX_RED_SIZE}, @code{GLX_GREEN_SIZE}, @code{GLX_BLUE_SIZE}, @code{GLX_ALPHA_SIZE} | |
126 | ||
127 | ||
128 | Each attribute, if present, must be followed by a nonnegative minimum | |
129 | size specification or @code{GLX_DONT_CARE}. The largest available total | |
130 | RGBA color buffer size (sum of @code{GLX_RED_SIZE}, | |
131 | @code{GLX_GREEN_SIZE}, @code{GLX_BLUE_SIZE}, and @code{GLX_ALPHA_SIZE}) | |
132 | of at least the minimum size specified for each color component is | |
133 | preferred. If the requested number of bits for a color component is 0 or | |
134 | @code{GLX_DONT_CARE}, it is not considered. The default value for each | |
135 | color component is 0. | |
136 | ||
137 | @item @code{GLX_DEPTH_SIZE} | |
138 | ||
139 | ||
140 | Must be followed by a nonnegative minimum size specification. If this | |
141 | value is zero, frame buffer configurations with no depth buffer are | |
142 | preferred. Otherwise, the largest available depth buffer of at least the | |
143 | minimum size is preferred. The default value is 0. | |
144 | ||
145 | @item @code{GLX_STENCIL_SIZE} | |
146 | ||
147 | ||
148 | Must be followed by a nonnegative integer that indicates the desired | |
149 | number of stencil bitplanes. The smallest stencil buffer of at least the | |
150 | specified size is preferred. If the desired value is zero, frame buffer | |
151 | configurations with no stencil buffer are preferred. The default value | |
152 | is 0. | |
153 | ||
154 | @item @code{GLX_ACCUM_RED_SIZE} | |
155 | ||
156 | ||
157 | Must be followed by a nonnegative minimum size specification. If this | |
158 | value is zero, frame buffer configurations with no red accumulation | |
159 | buffer are preferred. Otherwise, the largest possible red accumulation | |
160 | buffer of at least the minimum size is preferred. The default value is | |
161 | 0. | |
162 | ||
163 | @item @code{GLX_ACCUM_GREEN_SIZE} | |
164 | ||
165 | ||
166 | Must be followed by a nonnegative minimum size specification. If this | |
167 | value is zero, frame buffer configurations with no green accumulation | |
168 | buffer are preferred. Otherwise, the largest possible green accumulation | |
169 | buffer of at least the minimum size is preferred. The default value is | |
170 | 0. | |
171 | ||
172 | @item @code{GLX_ACCUM_BLUE_SIZE} | |
173 | ||
174 | ||
175 | Must be followed by a nonnegative minimum size specification. If this | |
176 | value is zero, frame buffer configurations with no blue accumulation | |
177 | buffer are preferred. Otherwise, the largest possible blue accumulation | |
178 | buffer of at least the minimum size is preferred. The default value is | |
179 | 0. | |
180 | ||
181 | @item @code{GLX_ACCUM_ALPHA_SIZE} | |
182 | ||
183 | ||
184 | Must be followed by a nonnegative minimum size specification. If this | |
185 | value is zero, frame buffer configurations with no alpha accumulation | |
186 | buffer are preferred. Otherwise, the largest possible alpha accumulation | |
187 | buffer of at least the minimum size is preferred. The default value is | |
188 | 0. | |
189 | ||
190 | @item @code{GLX_RENDER_TYPE} | |
191 | ||
192 | ||
193 | Must be followed by a mask indicating which OpenGL rendering modes the | |
194 | frame buffer configuration must support. Valid bits are | |
195 | @code{GLX_RGBA_BIT} and @code{GLX_COLOR_INDEX_BIT}. If the mask is set | |
196 | to @code{GLX_RGBA_BIT} | @code{GLX_COLOR_INDEX_BIT}, then only frame | |
197 | buffer configurations that can be bound to both RGBA contexts and color | |
198 | index contexts will be considered. The default value is | |
199 | @code{GLX_RGBA_BIT}. | |
200 | ||
201 | @item @code{GLX_DRAWABLE_TYPE} | |
202 | ||
203 | ||
204 | Must be followed by a mask indicating which GLX drawable types the frame | |
205 | buffer configuration must support. Valid bits are @code{GLX_WINDOW_BIT}, | |
206 | @code{GLX_PIXMAP_BIT}, and @code{GLX_PBUFFER_BIT}. For example, if mask | |
207 | is set to @code{GLX_WINDOW_BIT} | @code{GLX_PIXMAP_BIT}, only frame | |
208 | buffer configurations that support both windows and GLX pixmaps will be | |
209 | considered. The default value is @code{GLX_WINDOW_BIT}. | |
210 | ||
211 | @item @code{GLX_X_RENDERABLE} | |
212 | ||
213 | ||
214 | Must be followed by @code{True} or @code{False}. If @code{True} is | |
215 | specified, then only frame buffer configurations that have associated X | |
216 | visuals (and can be used to render to Windows and/or GLX pixmaps) will | |
217 | be considered. The default value is @code{GLX_DONT_CARE}. | |
218 | ||
219 | @item @code{GLX_X_VISUAL_TYPE} | |
220 | ||
221 | ||
222 | Must be followed by one of @code{GLX_TRUE_COLOR}, | |
223 | @code{GLX_DIRECT_COLOR}, @code{GLX_PSEUDO_COLOR}, | |
224 | @code{GLX_STATIC_COLOR}, @code{GLX_GRAY_SCALE}, or | |
225 | @code{GLX_STATIC_GRAY}, indicating the desired X visual type. Not all | |
226 | frame buffer configurations have an associated X visual. If | |
227 | @code{GLX_DRAWABLE_TYPE} is specified in @var{attrib_list} and the mask | |
228 | that follows does not have @code{GLX_WINDOW_BIT} set, then this value is | |
229 | ignored. It is also ignored if @code{GLX_X_RENDERABLE} is specified as | |
230 | @code{False}. RGBA rendering may be supported for visuals of type | |
231 | @code{GLX_TRUE_COLOR}, @code{GLX_DIRECT_COLOR}, @code{GLX_PSEUDO_COLOR}, | |
232 | or @code{GLX_STATIC_COLOR}, but color index rendering is only supported | |
233 | for visuals of type @code{GLX_PSEUDO_COLOR} or @code{GLX_STATIC_COLOR} | |
234 | (i.e., single-channel visuals). The tokens @code{GLX_GRAY_SCALE} and | |
235 | @code{GLX_STATIC_GRAY} will not match current OpenGL enabled visuals, | |
236 | but are included for future use. The default value for | |
237 | @code{GLX_X_VISUAL_TYPE} is @code{GLX_DONT_CARE}. | |
238 | ||
239 | @item @code{GLX_CONFIG_CAVEAT} | |
240 | ||
241 | ||
242 | Must be followed by one of @code{GLX_NONE}, @code{GLX_SLOW_CONFIG}, | |
243 | @code{GLX_NON_CONFORMANT_CONFIG}. If @code{GLX_NONE} is specified, then | |
244 | only frame buffer configurations with no caveats will be considered; if | |
245 | @code{GLX_SLOW_CONFIG} is specified, then only slow frame buffer | |
246 | configurations will be considered; if @code{GLX_NON_CONFORMANT_CONFIG} | |
247 | is specified, then only nonconformant frame buffer configurations will | |
248 | be considered. The default value is @code{GLX_DONT_CARE}. | |
249 | ||
250 | @item @code{GLX_TRANSPARENT_TYPE} | |
251 | ||
252 | ||
253 | Must be followed by one of @code{GLX_NONE}, @code{GLX_TRANSPARENT_RGB}, | |
254 | @code{GLX_TRANSPARENT_INDEX}. If @code{GLX_NONE} is specified, then only | |
255 | opaque frame buffer configurations will be considered; if | |
256 | @code{GLX_TRANSPARENT_RGB} is specified, then only transparent frame | |
257 | buffer configurations that support RGBA rendering will be considered; if | |
258 | @code{GLX_TRANSPARENT_INDEX} is specified, then only transparent frame | |
259 | buffer configurations that support color index rendering will be | |
260 | considered. The default value is @code{GLX_NONE}. | |
261 | ||
262 | @item @code{GLX_TRANSPARENT_INDEX_VALUE} | |
263 | ||
264 | ||
265 | Must be followed by an integer value indicating the transparent index | |
266 | value; the value must be between 0 and the maximum frame buffer value | |
267 | for indices. Only frame buffer configurations that use the specified | |
268 | transparent index value will be considered. The default value is | |
269 | @code{GLX_DONT_CARE}. This attribute is ignored unless | |
270 | @code{GLX_TRANSPARENT_TYPE} is included in @var{attrib_list} and | |
271 | specified as @code{GLX_TRANSPARENT_INDEX}. | |
272 | ||
273 | @item @code{GLX_TRANSPARENT_RED_VALUE} | |
274 | ||
275 | ||
276 | Must be followed by an integer value indicating the transparent red | |
277 | value; the value must be between 0 and the maximum frame buffer value | |
278 | for red. Only frame buffer configurations that use the specified | |
279 | transparent red value will be considered. The default value is | |
280 | @code{GLX_DONT_CARE}. This attribute is ignored unless | |
281 | @code{GLX_TRANSPARENT_TYPE} is included in @var{attrib_list} and | |
282 | specified as @code{GLX_TRANSPARENT_RGB}. | |
283 | ||
284 | @item @code{GLX_TRANSPARENT_GREEN_VALUE} | |
285 | ||
286 | ||
287 | Must be followed by an integer value indicating the transparent green | |
288 | value; the value must be between 0 and the maximum frame buffer value | |
289 | for green. Only frame buffer configurations that use the specified | |
290 | transparent green value will be considered. The default value is | |
291 | @code{GLX_DONT_CARE}. This attribute is ignored unless | |
292 | @code{GLX_TRANSPARENT_TYPE} is included in @var{attrib_list} and | |
293 | specified as @code{GLX_TRANSPARENT_RGB}. | |
294 | ||
295 | @item @code{GLX_TRANSPARENT_BLUE_VALUE} | |
296 | ||
297 | ||
298 | Must be followed by an integer value indicating the transparent blue | |
299 | value; the value must be between 0 and the maximum frame buffer value | |
300 | for blue. Only frame buffer configurations that use the specified | |
301 | transparent blue value will be considered. The default value is | |
302 | @code{GLX_DONT_CARE}. This attribute is ignored unless | |
303 | @code{GLX_TRANSPARENT_TYPE} is included in @var{attrib_list} and | |
304 | specified as @code{GLX_TRANSPARENT_RGB}. | |
305 | ||
306 | @item @code{GLX_TRANSPARENT_ALPHA_VALUE} | |
307 | ||
308 | ||
309 | Must be followed by an integer value indicating the transparent alpha | |
310 | value; the value must be between 0 and the maximum frame buffer value | |
311 | for alpha. Only frame buffer configurations that use the specified | |
312 | transparent alpha value will be considered. The default value is | |
313 | @code{GLX_DONT_CARE}. | |
314 | ||
315 | @end table | |
316 | ||
317 | When more than one GLX frame buffer configuration matches the specified | |
318 | attributes, a list of matching configurations is returned. The list is | |
319 | sorted according to the following precedence rules, which are applied in | |
320 | ascending order (i.e., configurations that are considered equal by a | |
321 | lower numbered rule are sorted by the higher numbered rule): | |
322 | ||
323 | @table @asis | |
324 | @item 1. | |
325 | By @code{GLX_CONFIG_CAVEAT} where the precedence is @code{GLX_NONE}, | |
326 | @code{GLX_SLOW_CONFIG}, and @code{GLX_NON_CONFORMANT_CONFIG}. | |
327 | ||
328 | @item 2. | |
329 | Larger total number of RGBA color components (@code{GLX_RED_SIZE}, | |
330 | @code{GLX_GREEN_SIZE}, @code{GLX_BLUE_SIZE}, plus @code{GLX_ALPHA_SIZE}) | |
331 | that have higher number of bits. If the requested number of bits in | |
332 | @var{attrib_list} is zero or @code{GLX_DONT_CARE} for a particular color | |
333 | component, then the number of bits for that component is not considered. | |
334 | ||
335 | @item 3. | |
336 | Smaller @code{GLX_BUFFER_SIZE}. | |
337 | ||
338 | @item 4. | |
339 | Single buffered configuration (@code{GLX_DOUBLEBUFFER} being | |
340 | @code{False} precedes a double buffered one. | |
341 | ||
342 | @item 5. | |
343 | Smaller @code{GLX_AUX_BUFFERS}. | |
344 | ||
345 | @item 6. | |
346 | Larger @code{GLX_DEPTH_SIZE}. | |
347 | ||
348 | @item 7. | |
349 | Smaller @code{GLX_STENCIL_SIZE}. | |
350 | ||
351 | @item 8. | |
352 | Larger total number of accumulation buffer color components | |
353 | (@code{GLX_ACCUM_RED_SIZE}, @code{GLX_ACCUM_GREEN_SIZE}, | |
354 | @code{GLX_ACCUM_BLUE_SIZE}, plus @code{GLX_ACCUM_ALPHA_SIZE}) that have | |
355 | higher number of bits. If the requested number of bits in | |
356 | @var{attrib_list} is zero or @code{GLX_DONT_CARE} for a particular color | |
357 | component, then the number of bits for that component is not considered. | |
358 | ||
359 | @item 9. | |
360 | By @code{GLX_X_VISUAL_TYPE} where the precedence order is | |
361 | @code{GLX_TRUE_COLOR}, @code{GLX_DIRECT_COLOR}, @code{GLX_PSEUDO_COLOR}, | |
362 | @code{GLX_STATIC_COLOR}, @code{GLX_GRAY_SCALE}, @code{GLX_STATIC_GRAY}. | |
363 | ||
364 | @end table | |
365 | ||
366 | @heading Errors | |
367 | @code{NULL} is returned if an undefined GLX attribute is encountered in | |
368 | @var{attrib_list}, if @var{screen} is invalid, or if @var{dpy} does not | |
369 | support the GLX extension. | |
370 | ||
371 | @end defun | |
372 | ||
373 | @defun glXChooseVisual | |
374 | @heading return a visual that matches specified attributes | |
375 | @heading Parameters | |
376 | @table @asis | |
377 | @item @var{dpy} | |
378 | Specifies the connection to the X server. | |
379 | ||
380 | @item @var{screen} | |
381 | Specifies the screen number. | |
382 | ||
383 | @item @var{attribList} | |
384 | Specifies a list of boolean attributes and integer attribute/value | |
385 | pairs. The last attribute must be @code{None}. | |
386 | ||
387 | @end table | |
388 | ||
389 | @heading Description | |
390 | @code{glXChooseVisual} returns a pointer to an XVisualInfo structure | |
391 | describing the visual that best meets a minimum specification. The | |
392 | boolean GLX attributes of the visual that is returned will match the | |
393 | specified values, and the integer GLX attributes will meet or exceed the | |
394 | specified minimum values. If all other attributes are equivalent, then | |
395 | TrueColor and PseudoColor visuals have priority over DirectColor and | |
396 | StaticColor visuals, respectively. If no conforming visual exists, | |
397 | @code{NULL} is returned. To free the data returned by this function, use | |
398 | @code{XFree}. | |
399 | ||
400 | All boolean GLX attributes default to @code{False} except | |
401 | @code{GLX_USE_GL}, which defaults to @code{True}. All integer GLX | |
402 | attributes default to zero. Default specifications are superseded by | |
403 | attributes included in @var{attribList}. Boolean attributes included in | |
404 | @var{attribList} are understood to be @code{True}. Integer attributes | |
405 | and enumerated type attributes are followed immediately by the | |
406 | corresponding desired or minimum value. The list must be terminated with | |
407 | @code{None}. | |
408 | ||
409 | The interpretations of the various GLX visual attributes are as follows: | |
410 | ||
411 | @table @asis | |
412 | @item @code{GLX_USE_GL} | |
413 | Ignored. Only visuals that can be rendered with GLX are considered. | |
414 | ||
415 | @item @code{GLX_BUFFER_SIZE} | |
416 | Must be followed by a nonnegative integer that indicates the desired | |
417 | color index buffer size. The smallest index buffer of at least the | |
418 | specified size is preferred. Ignored if @code{GLX_RGBA} is asserted. | |
419 | ||
420 | @item @code{GLX_LEVEL} | |
421 | Must be followed by an integer buffer-level specification. This | |
422 | specification is honored exactly. Buffer level zero corresponds to the | |
423 | main frame buffer of the display. Buffer level one is the first overlay | |
424 | frame buffer, level two the second overlay frame buffer, and so on. | |
425 | Negative buffer levels correspond to underlay frame buffers. | |
426 | ||
427 | @item @code{GLX_RGBA} | |
428 | If present, only TrueColor and DirectColor visuals are considered. | |
429 | Otherwise, only PseudoColor and StaticColor visuals are considered. | |
430 | ||
431 | @item @code{GLX_DOUBLEBUFFER} | |
432 | If present, only double-buffered visuals are considered. Otherwise, only | |
433 | single-buffered visuals are considered. | |
434 | ||
435 | @item @code{GLX_STEREO} | |
436 | If present, only stereo visuals are considered. Otherwise, only | |
437 | monoscopic visuals are considered. | |
438 | ||
439 | @item @code{GLX_AUX_BUFFERS} | |
440 | Must be followed by a nonnegative integer that indicates the desired | |
441 | number of auxiliary buffers. Visuals with the smallest number of | |
442 | auxiliary buffers that meets or exceeds the specified number are | |
443 | preferred. | |
444 | ||
445 | @item @code{GLX_RED_SIZE} | |
446 | Must be followed by a nonnegative minimum size specification. If this | |
447 | value is zero, the smallest available red buffer is preferred. | |
448 | Otherwise, the largest available red buffer of at least the minimum size | |
449 | is preferred. | |
450 | ||
451 | @item @code{GLX_GREEN_SIZE} | |
452 | Must be followed by a nonnegative minimum size specification. If this | |
453 | value is zero, the smallest available green buffer is preferred. | |
454 | Otherwise, the largest available green buffer of at least the minimum | |
455 | size is preferred. | |
456 | ||
457 | @item @code{GLX_BLUE_SIZE} | |
458 | Must be followed by a nonnegative minimum size specification. If this | |
459 | value is zero, the smallest available blue buffer is preferred. | |
460 | Otherwise, the largest available blue buffer of at least the minimum | |
461 | size is preferred. | |
462 | ||
463 | @item @code{GLX_ALPHA_SIZE} | |
464 | Must be followed by a nonnegative minimum size specification. If this | |
465 | value is zero, the smallest available alpha buffer is preferred. | |
466 | Otherwise, the largest available alpha buffer of at least the minimum | |
467 | size is preferred. | |
468 | ||
469 | @item @code{GLX_DEPTH_SIZE} | |
470 | Must be followed by a nonnegative minimum size specification. If this | |
471 | value is zero, visuals with no depth buffer are preferred. Otherwise, | |
472 | the largest available depth buffer of at least the minimum size is | |
473 | preferred. | |
474 | ||
475 | @item @code{GLX_STENCIL_SIZE} | |
476 | Must be followed by a nonnegative integer that indicates the desired | |
477 | number of stencil bitplanes. The smallest stencil buffer of at least the | |
478 | specified size is preferred. If the desired value is zero, visuals with | |
479 | no stencil buffer are preferred. | |
480 | ||
481 | @item @code{GLX_ACCUM_RED_SIZE} | |
482 | Must be followed by a nonnegative minimum size specification. If this | |
483 | value is zero, visuals with no red accumulation buffer are preferred. | |
484 | Otherwise, the largest possible red accumulation buffer of at least the | |
485 | minimum size is preferred. | |
486 | ||
487 | @item @code{GLX_ACCUM_GREEN_SIZE} | |
488 | Must be followed by a nonnegative minimum size specification. If this | |
489 | value is zero, visuals with no green accumulation buffer are preferred. | |
490 | Otherwise, the largest possible green accumulation buffer of at least | |
491 | the minimum size is preferred. | |
492 | ||
493 | @item @code{GLX_ACCUM_BLUE_SIZE} | |
494 | Must be followed by a nonnegative minimum size specification. If this | |
495 | value is zero, visuals with no blue accumulation buffer are preferred. | |
496 | Otherwise, the largest possible blue accumulation buffer of at least the | |
497 | minimum size is preferred. | |
498 | ||
499 | @item @code{GLX_ACCUM_ALPHA_SIZE} | |
500 | Must be followed by a nonnegative minimum size specification. If this | |
501 | value is zero, visuals with no alpha accumulation buffer are preferred. | |
502 | Otherwise, the largest possible alpha accumulation buffer of at least | |
503 | the minimum size is preferred. | |
504 | ||
505 | @end table | |
506 | ||
507 | @heading Errors | |
508 | @code{NULL} is returned if an undefined GLX attribute is encountered in | |
509 | @var{attribList}. | |
510 | ||
511 | @end defun | |
512 | ||
513 | @defun glXCopyContext | |
514 | @heading copy state from one rendering context to another | |
515 | @heading Parameters | |
516 | @table @asis | |
517 | @item @var{dpy} | |
518 | Specifies the connection to the X server. | |
519 | ||
520 | @item @var{src} | |
521 | Specifies the source context. | |
522 | ||
523 | @item @var{dst} | |
524 | Specifies the destination context. | |
525 | ||
526 | @item @var{mask} | |
527 | Specifies which portions of @var{src} state are to be copied to | |
528 | @var{dst}. | |
529 | ||
530 | @end table | |
531 | ||
532 | @heading Description | |
533 | @code{glXCopyContext} copies selected groups of state variables from | |
534 | @var{src} to @var{dst}. @var{mask} indicates which groups of state | |
535 | variables are to be copied. @var{mask} contains the bitwise OR of the | |
536 | same symbolic names that are passed to the GL command | |
537 | @code{glPushAttrib}. The single symbolic constant | |
538 | @code{GLX_ALL_ATTRIB_BITS} can be used to copy the maximum possible | |
539 | portion of rendering state. | |
540 | ||
541 | The copy can be done only if the renderers named by @var{src} and | |
542 | @var{dst} share an address space. Two rendering contexts share an | |
543 | address space if both are nondirect using the same server, or if both | |
544 | are direct and owned by a single process. Note that in the nondirect | |
545 | case it is not necessary for the calling threads to share an address | |
546 | space, only for their related rendering contexts to share an address | |
547 | space. | |
548 | ||
549 | Not all values for GL state can be copied. For example, pixel pack and | |
550 | unpack state, render mode state, and select and feedback state are not | |
551 | copied. The state that can be copied is exactly the state that is | |
552 | manipulated by the GL command @code{glPushAttrib}. | |
553 | ||
554 | An implicit @code{glFlush} is done by @code{glXCopyContext} if @var{src} | |
555 | is the current context for the calling thread. | |
556 | ||
557 | @heading Errors | |
558 | @code{BadMatch} is generated if rendering contexts @var{src} and | |
559 | @var{dst} do not share an address space or were not created with respect | |
560 | to the same screen. | |
561 | ||
562 | @code{BadAccess} is generated if @var{dst} is current to any thread | |
563 | (including the calling thread) at the time @code{glXCopyContext} is | |
564 | called. | |
565 | ||
566 | @code{GLXBadCurrentWindow} is generated if @var{src} is the current | |
567 | context and the current drawable is a window that is no longer valid. | |
568 | ||
569 | @code{GLXBadContext} is generated if either @var{src} or @var{dst} is | |
570 | not a valid GLX context. | |
571 | ||
572 | @end defun | |
573 | ||
574 | @defun glXCreateContext | |
575 | @heading create a new GLX rendering context | |
576 | @heading Parameters | |
577 | @table @asis | |
578 | @item @var{dpy} | |
579 | Specifies the connection to the X server. | |
580 | ||
581 | @item @var{vis} | |
582 | Specifies the visual that defines the frame buffer resources available | |
583 | to the rendering context. It is a pointer to an @code{XVisualInfo} | |
584 | structure, not a visual ID or a pointer to a @code{Visual}. | |
585 | ||
586 | @item @var{shareList} | |
587 | Specifies the context with which to share display lists. @code{NULL} | |
588 | indicates that no sharing is to take place. | |
589 | ||
590 | @item @var{direct} | |
591 | Specifies whether rendering is to be done with a direct connection to | |
592 | the graphics system if possible (@code{True}) or through the X server | |
593 | (@code{False}). | |
594 | ||
595 | @end table | |
596 | ||
597 | @heading Description | |
598 | @code{glXCreateContext} creates a GLX rendering context and returns its | |
599 | handle. This context can be used to render into both windows and GLX | |
600 | pixmaps. If @code{glXCreateContext} fails to create a rendering context, | |
601 | @code{NULL} is returned. | |
602 | ||
603 | If @var{direct} is @code{True}, then a direct rendering context is | |
604 | created if the implementation supports direct rendering, if the | |
605 | connection is to an X server that is local, and if a direct rendering | |
606 | context is available. (An implementation may return an indirect context | |
607 | when @var{direct} is @code{True}.) If @var{direct} is @code{False}, then | |
608 | a rendering context that renders through the X server is always created. | |
609 | Direct rendering provides a performance advantage in some | |
610 | implementations. However, direct rendering contexts cannot be shared | |
611 | outside a single process, and they may be unable to render to GLX | |
612 | pixmaps. | |
613 | ||
614 | If @var{shareList} is not @code{NULL}, then all display-list indexes and | |
615 | definitions are shared by context @var{shareList} and by the newly | |
616 | created context. An arbitrary number of contexts can share a single | |
617 | display-list space. However, all rendering contexts that share a single | |
618 | display-list space must themselves exist in the same address space. Two | |
619 | rendering contexts share an address space if both are nondirect using | |
620 | the same server, or if both are direct and owned by a single process. | |
621 | Note that in the nondirect case, it is not necessary for the calling | |
622 | threads to share an address space, only for their related rendering | |
623 | contexts to share an address space. | |
624 | ||
625 | If the GL version is 1.1 or greater, then all texture objects except | |
626 | object 0 are shared by any contexts that share display lists. | |
627 | ||
628 | @heading Errors | |
629 | @code{NULL} is returned if execution fails on the client side. | |
630 | ||
631 | @code{BadMatch} is generated if the context to be created would not | |
632 | share the address space or the screen of the context specified by | |
633 | @var{shareList}. | |
634 | ||
635 | @code{BadValue} is generated if @var{vis} is not a valid visual (for | |
636 | example, if a particular GLX implementation does not support it). | |
637 | ||
638 | @code{GLXBadContext} is generated if @var{shareList} is not a GLX | |
639 | context and is not @code{NULL}. | |
640 | ||
641 | @code{BadAlloc} is generated if the server does not have enough | |
642 | resources to allocate the new context. | |
643 | ||
644 | @end defun | |
645 | ||
646 | @defun glXCreateGLXPixmap | |
647 | @heading create an off-screen GLX rendering area | |
648 | @heading Parameters | |
649 | @table @asis | |
650 | @item @var{dpy} | |
651 | Specifies the connection to the X server. | |
652 | ||
653 | @item @var{vis} | |
654 | Specifies the visual that defines the structure of the rendering area. | |
655 | It is a pointer to an @code{XVisualInfo} structure, not a visual ID or a | |
656 | pointer to a @code{Visual}. | |
657 | ||
658 | @item @var{pixmap} | |
659 | Specifies the X pixmap that will be used as the front left color buffer | |
660 | of the off-screen rendering area. | |
661 | ||
662 | @end table | |
663 | ||
664 | @heading Description | |
665 | @code{glXCreateGLXPixmap} creates an off-screen rendering area and | |
666 | returns its XID. Any GLX rendering context that was created with respect | |
667 | to @var{vis} can be used to render into this off-screen area. Use | |
668 | @code{glXMakeCurrent} to associate the rendering area with a GLX | |
669 | rendering context. | |
670 | ||
671 | The X pixmap identified by @var{pixmap} is used as the front left buffer | |
672 | of the resulting off-screen rendering area. All other buffers specified | |
673 | by @var{vis}, including color buffers other than the front left buffer, | |
674 | are created without externally visible names. GLX pixmaps with | |
675 | double-buffering are supported. However, @code{glXSwapBuffers} is | |
676 | ignored by these pixmaps. | |
677 | ||
678 | Some implementations may not support GLX pixmaps with direct rendering | |
679 | contexts. | |
680 | ||
681 | @heading Errors | |
682 | @code{BadMatch} is generated if the depth of @var{pixmap} does not match | |
683 | the depth value reported by core X11 for @var{vis}, or if @var{pixmap} | |
684 | was not created with respect to the same screen as @var{vis}. | |
685 | ||
686 | @code{BadValue} is generated if @var{vis} is not a valid XVisualInfo | |
687 | pointer (for example, if a particular GLX implementation does not | |
688 | support this visual). | |
689 | ||
690 | @code{BadPixmap} is generated if @var{pixmap} is not a valid pixmap. | |
691 | ||
692 | @code{BadAlloc} is generated if the server cannot allocate the GLX | |
693 | pixmap. | |
694 | ||
695 | @end defun | |
696 | ||
697 | @defun glXCreateNewContext | |
698 | @heading create a new GLX rendering context | |
699 | @heading Parameters | |
700 | @table @asis | |
701 | @item @var{dpy} | |
702 | Specifies the connection to the X server. | |
703 | ||
704 | @item @var{config} | |
705 | Specifies the GLXFBConfig structure with the desired attributes for the | |
706 | context. | |
707 | ||
708 | @item @var{render_type} | |
709 | Specifies the type of the context to be created. Must be one of | |
710 | @code{GLX_RGBA_TYPE} or @code{GLX_COLOR_INDEX_TYPE}. | |
711 | ||
712 | @item @var{share_list} | |
713 | Specifies the context with which to share display lists. @code{NULL} | |
714 | indicates that no sharing is to take place. | |
715 | ||
716 | @item @var{share_list} | |
717 | Specifies whether rendering is to be done with a direct connection to | |
718 | the graphics system if possible (@code{True}) or through the X server | |
719 | (@code{False}). | |
720 | ||
721 | @end table | |
722 | ||
723 | @heading Description | |
724 | @code{glXCreateNewContext} creates a GLX rendering context and returns | |
725 | its handle. This context can be used to render into GLX windows, | |
726 | pixmaps, or pixel buffers. If @code{glXCreateNewContext} fails to create | |
727 | a rendering context, @code{NULL} is returned. | |
728 | ||
729 | If @var{render_type} is @code{GLX_RGBA_TYPE}, then a context that | |
730 | supports RGBA rendering is created. If @var{config} is | |
731 | @code{GLX_COLOR_INDEX_TYPE}, then context supporting color-index | |
732 | rendering is created. | |
733 | ||
734 | If @var{render_type} is not @code{NULL}, then all display-list indexes | |
735 | and definitions are shared by context @var{render_type} and by the newly | |
736 | created context. An arbitrary number of contexts can share a single | |
737 | display-list space. However, all rendering contexts that share a single | |
738 | display-list space must themselves exist in the same address space. Two | |
739 | rendering contexts share an address space if both are nondirect using | |
740 | the same server, or if both are direct and owned by a single process. | |
741 | Note that in the nondirect case, it is not necessary for the calling | |
742 | threads to share an address space, only for their related rendering | |
743 | contexts to share an address space. | |
744 | ||
745 | If @var{share_list} is @code{True}, then a direct-rendering context is | |
746 | created if the implementation supports direct rendering, if the | |
747 | connection is to an X server that is local, and if a direct-rendering | |
748 | context is available. (An implementation may return an indirect context | |
749 | when @var{share_list} is @code{True}.) If @var{share_list} is | |
750 | @code{False}, then a rendering context that renders through the X server | |
751 | is always created. Direct rendering provides a performance advantage in | |
752 | some implementations. However, direct-rendering contexts cannot be | |
753 | shared outside a single process, and they may be unable to render to GLX | |
754 | pixmaps. | |
755 | ||
756 | @heading Errors | |
757 | @code{NULL} is returned if execution fails on the client side. | |
758 | ||
759 | @code{GLXBadContext} is generated if @var{render_type} is not a GLX | |
760 | context and is not @code{NULL}. | |
761 | ||
762 | @code{GLXBadFBConfig} is generated if @var{config} is not a valid | |
763 | GLXFBConfig. | |
764 | ||
765 | @code{BadMatch} is generated if the context to be created would not | |
766 | share the address space or the screen of the context specified by | |
767 | @var{render_type}. | |
768 | ||
769 | @code{BadAlloc} is generated if the server does not have enough | |
770 | resources to allocate the new context. | |
771 | ||
772 | @code{BadValue} is generated if @var{config} is not a valid visual (for | |
773 | example, if a particular GLX implementation does not support it). | |
774 | ||
775 | @end defun | |
776 | ||
777 | @defun glXCreatePbuffer | |
778 | @heading create an off-screen rendering area | |
779 | @heading Parameters | |
780 | @table @asis | |
781 | @item @var{dpy} | |
782 | Specifies the connection to the X server. | |
783 | ||
784 | @item @var{config} | |
785 | Specifies a GLXFBConfig structure with the desired attributes for the | |
786 | window. | |
787 | ||
788 | @item @var{attrib_list} | |
789 | Specifies a list of attribute value pairs, which must be terminated with | |
790 | @code{None} or @code{NULL}. Accepted attributes are | |
791 | @code{GLX_PBUFFER_WIDTH}, @code{GLX_PBUFFER_HEIGHT}, | |
792 | @code{GLX_PRESERVED_CONTENTS}, and @code{GLX_LARGEST_PBUFFER}. | |
793 | ||
794 | @end table | |
795 | ||
796 | @heading Description | |
797 | @code{glXCreatePbuffer} creates an off-screen rendering area and returns | |
798 | its XID. Any GLX rendering context that was created with respect to | |
799 | @var{config} can be used to render into this window. Use | |
800 | @code{glXMakeContextCurrent} to associate the rendering area with a GLX | |
801 | rendering context. | |
802 | ||
803 | The accepted attributes for a GLXPbuffer are: | |
804 | ||
805 | @table @asis | |
806 | @item @code{GLX_PBUFFER_WIDTH} | |
807 | Specify the pixel width of the requested GLXPbuffer. The default value | |
808 | is 0. | |
809 | ||
810 | @item @code{GLX_PBUFFER_HEIGHT} | |
811 | Specify the pixel height of the requested GLXPbuffer. The default value | |
812 | is 0. | |
813 | ||
814 | @item @code{GLX_LARGEST_PBUFFER} | |
815 | Specify to obtain the largest available pixel buffer, if the requested | |
816 | allocation would have failed. The width and height of the allocated | |
817 | pixel buffer will never exceed the specified @code{GLX_PBUFFER_WIDTH} or | |
818 | @code{GLX_PBUFFER_HEIGHT}, respectively. Use @code{glXQueryDrawable} to | |
819 | retrieve the dimensions of the allocated pixel buffer. The default value | |
820 | is @code{False}. | |
821 | ||
822 | @item @code{GLX_PRESERVED_CONTENTS} | |
823 | Specify if the contents of the pixel buffer should be preserved when a | |
824 | resource conflict occurs. If set to @code{False}, the contents of the | |
825 | pixel buffer may be lost at any time. If set to @code{True}, or not | |
826 | specified in @var{attrib_list}, then the contents of the pixel buffer | |
827 | will be preserved (most likely by copying the contents into main system | |
828 | memory from the frame buffer). In either case, the client can register | |
829 | (using @code{glXSelectEvent}, to receive pixel buffer clobber events | |
830 | that are generated when the pbuffer contents have been preserved or | |
831 | damaged. | |
832 | ||
833 | @end table | |
834 | ||
835 | GLXPbuffers contain the color and ancillary buffers specified by | |
836 | @var{config}. It is possible to create a pixel buffer with back buffers | |
837 | and to swap those buffers using @code{glXSwapBuffers}. | |
838 | ||
839 | @heading Errors | |
840 | @code{BadAlloc} is generated if there are insufficient resources to | |
841 | allocate the requested GLXPbuffer. | |
842 | ||
843 | @code{GLXBadFBConfig} is generated if @var{config} is not a valid | |
844 | GLXFBConfig. | |
845 | ||
846 | @code{BadMatch} is generated if @var{config} does not support rendering | |
847 | to pixel buffers (e.g., @code{GLX_DRAWABLE_TYPE} does not contain | |
848 | @code{GLX_PBUFFER_BIT}). | |
849 | ||
850 | @end defun | |
851 | ||
852 | @defun glXCreatePixmap | |
853 | @heading create an off-screen rendering area | |
854 | @heading Parameters | |
855 | @table @asis | |
856 | @item @var{dpy} | |
857 | Specifies the connection to the X server. | |
858 | ||
859 | @item @var{config} | |
860 | Specifies a GLXFBConfig structure with the desired attributes for the | |
861 | window. | |
862 | ||
863 | @item @var{pixmap} | |
864 | Specifies the X pixmap to be used as the rendering area. | |
865 | ||
866 | @item @var{attrib_list} | |
867 | Currently unused. This must be set to @code{NULL} or be an empty list | |
868 | (i.e., one in which the first element is @code{None}). | |
869 | ||
870 | @end table | |
871 | ||
872 | @heading Description | |
873 | @code{glXCreatePixmap} creates an off-screen rendering area and returns | |
874 | its XID. Any GLX rendering context that was created with respect to | |
875 | @var{config} can be used to render into this window. Use | |
876 | @code{glXMakeCurrent} to associate the rendering area with a GLX | |
877 | rendering context. | |
878 | ||
879 | @heading Errors | |
880 | @code{BadMatch} is generated if @var{pixmap} was not created with a | |
881 | visual that corresponds to @var{config}. | |
882 | ||
883 | @code{BadMatch} is generated if @var{config} does not support rendering | |
884 | to windows (e.g., @code{GLX_DRAWABLE_TYPE} does not contain | |
885 | @code{GLX_WINDOW_BIT}). | |
886 | ||
887 | @code{BadWindow} is generated if @var{pixmap} is not a valid window XID. | |
888 | @code{BadAlloc} is generated if there is already a GLXFBConfig | |
889 | associated with @var{pixmap}. | |
890 | ||
891 | @code{BadAlloc} is generated if the X server cannot allocate a new GLX | |
892 | window. | |
893 | ||
894 | @code{GLXBadFBConfig} is generated if @var{config} is not a valid | |
895 | GLXFBConfig. | |
896 | ||
897 | ||
898 | ||
899 | @end defun | |
900 | ||
901 | @defun glXCreateWindow | |
902 | @heading create an on-screen rendering area | |
903 | @heading Parameters | |
904 | @table @asis | |
905 | @item @var{dpy} | |
906 | Specifies the connection to the X server. | |
907 | ||
908 | @item @var{config} | |
909 | Specifies a GLXFBConfig structure with the desired attributes for the | |
910 | window. | |
911 | ||
912 | @item @var{win} | |
913 | Specifies the X window to be used as the rendering area. | |
914 | ||
915 | @item @var{attrib_list} | |
916 | Currently unused. This must be set to @code{NULL} or be an empty list | |
917 | (i.e., one in which the first element is @code{None}). | |
918 | ||
919 | @end table | |
920 | ||
921 | @heading Description | |
922 | @code{glXCreateWindow} creates an on-screen rendering area from an | |
923 | existing X window that was created with a visual matching @var{config}. | |
924 | The XID of the GLXWindow is returned. Any GLX rendering context that was | |
925 | created with respect to @var{config} can be used to render into this | |
926 | window. Use @code{glXMakeContextCurrent} to associate the rendering area | |
927 | with a GLX rendering context. | |
928 | ||
929 | @heading Errors | |
930 | @code{BadMatch} is generated if @var{win} was not created with a visual | |
931 | that corresponds to @var{config}. | |
932 | ||
933 | @code{BadMatch} is generated if @var{config} does not support rendering | |
934 | to windows (i.e., @code{GLX_DRAWABLE_TYPE} does not contain | |
935 | @code{GLX_WINDOW_BIT}). | |
936 | ||
937 | @code{BadWindow} is generated if @var{win} is not a valid pixmap XID. | |
938 | ||
939 | @code{BadAlloc} is generated if there is already a GLXFBConfig | |
940 | associated with @var{win}. | |
941 | ||
942 | @code{BadAlloc} is generated if the X server cannot allocate a new GLX | |
943 | window. | |
944 | ||
945 | @code{GLXBadFBConfig} is generated if @var{config} is not a valid | |
946 | GLXFBConfig. | |
947 | ||
948 | ||
949 | ||
950 | @end defun | |
951 | ||
952 | @defun glXDestroyContext | |
953 | @heading destroy a GLX context | |
954 | @heading Parameters | |
955 | @table @asis | |
956 | @item @var{dpy} | |
957 | Specifies the connection to the X server. | |
958 | ||
959 | @item @var{ctx} | |
960 | Specifies the GLX context to be destroyed. | |
961 | ||
962 | @end table | |
963 | ||
964 | @heading Description | |
965 | If the GLX rendering context @var{ctx} is not current to any thread, | |
966 | @code{glXDestroyContext} destroys it immediately. Otherwise, @var{ctx} | |
967 | is destroyed when it becomes not current to any thread. In either case, | |
968 | the resource ID referenced by @var{ctx} is freed immediately. | |
969 | ||
970 | @heading Errors | |
971 | @code{GLXBadContext} is generated if @var{ctx} is not a valid GLX | |
972 | context. | |
973 | ||
974 | @end defun | |
975 | ||
976 | @defun glXDestroyGLXPixmap | |
977 | @heading destroy a GLX pixmap | |
978 | @heading Parameters | |
979 | @table @asis | |
980 | @item @var{dpy} | |
981 | Specifies the connection to the X server. | |
982 | ||
983 | @item @var{pix} | |
984 | Specifies the GLX pixmap to be destroyed. | |
985 | ||
986 | @end table | |
987 | ||
988 | @heading Description | |
989 | If the GLX pixmap @var{pix} is not current to any client, | |
990 | @code{glXDestroyGLXPixmap} destroys it immediately. Otherwise, @var{pix} | |
991 | is destroyed when it becomes not current to any client. In either case, | |
992 | the resource ID is freed immediately. | |
993 | ||
994 | @heading Errors | |
995 | @code{GLXBadPixmap} is generated if @var{pix} is not a valid GLX pixmap. | |
996 | ||
997 | @end defun | |
998 | ||
999 | @defun glXDestroyPbuffer | |
1000 | @heading destroy an off-screen rendering area | |
1001 | @heading Parameters | |
1002 | @table @asis | |
1003 | @item @var{dpy} | |
1004 | Specifies the connection to the X server. | |
1005 | ||
1006 | @item @var{pbuf} | |
1007 | Specifies the GLXPbuffer to be destroyed. | |
1008 | ||
1009 | @end table | |
1010 | ||
1011 | @heading Description | |
1012 | @code{glXDestroyPbuffer} destroys a GLXPbuffer created by | |
1013 | @code{glXCreatePbuffer}. | |
1014 | ||
1015 | @heading Errors | |
1016 | @code{GLXBadPbuffer} is generated if @var{pbuf} is not a valid | |
1017 | GLXPbuffer. | |
1018 | ||
1019 | @end defun | |
1020 | ||
1021 | @defun glXDestroyPixmap | |
1022 | @heading destroy an off-screen rendering area | |
1023 | @heading Parameters | |
1024 | @table @asis | |
1025 | @item @var{dpy} | |
1026 | Specifies the connection to the X server. | |
1027 | ||
1028 | @item @var{pixmap} | |
1029 | Specifies the GLXPixmap to be destroyed. | |
1030 | ||
1031 | @end table | |
1032 | ||
1033 | @heading Description | |
1034 | @code{glXDestroyPixmap} destroys a GLXPixmap created by | |
1035 | @code{glXCreatePixmap}. | |
1036 | ||
1037 | @heading Errors | |
1038 | @code{GLXBadPixmap} is generated if @var{pixmap} is not a valid | |
1039 | GLXPixmap. | |
1040 | ||
1041 | @end defun | |
1042 | ||
1043 | @defun glXDestroyWindow | |
1044 | @heading destroy an on-screen rendering area | |
1045 | @heading Parameters | |
1046 | @table @asis | |
1047 | @item @var{dpy} | |
1048 | Specifies the connection to the X server. | |
1049 | ||
1050 | @item @var{win} | |
1051 | Specifies the GLXWindow to be destroyed. | |
1052 | ||
1053 | @end table | |
1054 | ||
1055 | @heading Description | |
1056 | @code{glXDestroyWindow} destroys a GLXWindow created by | |
1057 | @code{glXCreateWindow}. | |
1058 | ||
1059 | @heading Errors | |
1060 | @code{GLXBadWindow} is generated if @var{win} is not a valid GLXPixmap. | |
1061 | ||
1062 | @end defun | |
1063 | ||
1064 | @defun glXFreeContextEXT | |
1065 | @heading free client-side memory for imported context | |
1066 | @heading Parameters | |
1067 | @table @asis | |
1068 | @item @var{dpy} | |
1069 | Specifies the connection to the X server. | |
1070 | ||
1071 | @item @var{ctx} | |
1072 | Specifies a GLX rendering context. | |
1073 | ||
1074 | @end table | |
1075 | ||
1076 | @heading Description | |
1077 | @code{glXFreeContextEXT} frees the client-side part of a GLXContext that | |
1078 | was created with @code{glXImportContextEXT}. @code{glXFreeContextEXT} | |
1079 | does not free the server-side context information or the XID associated | |
1080 | with the server-side context. | |
1081 | ||
1082 | @code{glXFreeContextEXT} is part of the @code{EXT_import_context} | |
1083 | extension, not part of the core GLX command set. If | |
1084 | _glxextstring(EXT_import_context) is included in the string returned by | |
1085 | @code{glXQueryExtensionsString}, when called with argument | |
1086 | @code{GLX_EXTENSIONS}, extension @code{EXT_vertex_array} is supported. | |
1087 | ||
1088 | @heading Errors | |
1089 | @code{GLXBadContext} is generated if @var{ctx} does not refer to a valid | |
1090 | context. | |
1091 | ||
1092 | @end defun | |
1093 | ||
1094 | @defun glXGetClientString | |
1095 | @heading return a string describing the client | |
1096 | @heading Parameters | |
1097 | @table @asis | |
1098 | @item @var{dpy} | |
1099 | Specifies the connection to the X server. | |
1100 | ||
1101 | @item @var{name} | |
1102 | Specifies which string is returned. The symbolic constants | |
1103 | @code{GLX_VENDOR}, @code{GLX_VERSION}, and @code{GLX_EXTENSIONS} are | |
1104 | accepted. | |
1105 | ||
1106 | @end table | |
1107 | ||
1108 | @heading Description | |
1109 | @code{glXGetClientString} returns a string describing some aspect of the | |
1110 | client library. The possible values for @var{name} are | |
1111 | @code{GLX_VENDOR}, @code{GLX_VERSION}, and @code{GLX_EXTENSIONS}. If | |
1112 | @var{name} is not set to one of these values, @code{glXGetClientString} | |
1113 | returns @code{NULL}. The format and contents of the vendor string is | |
1114 | implementation dependent. | |
1115 | ||
1116 | The extensions string is null-terminated and contains a space-separated | |
1117 | list of extension names. (The extension names never contain spaces.) If | |
1118 | there are no extensions to GLX, then the empty string is returned. | |
1119 | ||
1120 | The version string is laid out as follows: | |
1121 | ||
1122 | <major_version.minor_version><space><vendor-specific info> | |
1123 | ||
1124 | Both the major and minor portions of the version number are of arbitrary | |
1125 | length. The vendor-specific information is optional. However, if it is | |
1126 | present, the format and contents are implementation specific. | |
1127 | ||
1128 | @end defun | |
1129 | ||
1130 | @defun glXGetConfig | |
1131 | @heading return information about GLX visuals | |
1132 | @heading Parameters | |
1133 | @table @asis | |
1134 | @item @var{dpy} | |
1135 | Specifies the connection to the X server. | |
1136 | ||
1137 | @item @var{vis} | |
1138 | Specifies the visual to be queried. It is a pointer to an | |
1139 | @code{XVisualInfo} structure, not a visual ID or a pointer to a | |
1140 | @code{Visual}. | |
1141 | ||
1142 | @item @var{attrib} | |
1143 | Specifies the visual attribute to be returned. | |
1144 | ||
1145 | @item @var{value} | |
1146 | Returns the requested value. | |
1147 | ||
1148 | @end table | |
1149 | ||
1150 | @heading Description | |
1151 | @code{glXGetConfig} sets @var{value} to the @var{attrib} value of | |
1152 | windows or GLX pixmaps created with respect to @var{vis}. | |
1153 | @code{glXGetConfig} returns an error code if it fails for any reason. | |
1154 | Otherwise, zero is returned. | |
1155 | ||
1156 | @var{attrib} is one of the following: | |
1157 | ||
1158 | ||
1159 | ||
1160 | @table @asis | |
1161 | @item @code{GLX_USE_GL} | |
1162 | @code{True} if OpenGL rendering is supported by this visual, | |
1163 | @code{False} otherwise. | |
1164 | ||
1165 | @item @code{GLX_BUFFER_SIZE} | |
1166 | Number of bits per color buffer. For RGBA visuals, | |
1167 | @code{GLX_BUFFER_SIZE} is the sum of @code{GLX_RED_SIZE}, | |
1168 | @code{GLX_GREEN_SIZE}, @code{GLX_BLUE_SIZE}, and @code{GLX_ALPHA_SIZE}. | |
1169 | For color index visuals, @code{GLX_BUFFER_SIZE} is the size of the color | |
1170 | indexes. | |
1171 | ||
1172 | @item @code{GLX_LEVEL} | |
1173 | Frame buffer level of the visual. Level zero is the default frame | |
1174 | buffer. Positive levels correspond to frame buffers that overlay the | |
1175 | default buffer, and negative levels correspond to frame buffers that | |
1176 | underlay the default buffer. | |
1177 | ||
1178 | @item @code{GLX_RGBA} | |
1179 | @code{True} if color buffers store red, green, blue, and alpha values. | |
1180 | @code{False} if they store color indexes. | |
1181 | ||
1182 | @item @code{GLX_DOUBLEBUFFER} | |
1183 | @code{True} if color buffers exist in front/back pairs that can be | |
1184 | swapped, @code{False} otherwise. | |
1185 | ||
1186 | @item @code{GLX_STEREO} | |
1187 | @code{True} if color buffers exist in left/right pairs, @code{False} | |
1188 | otherwise. | |
1189 | ||
1190 | @item @code{GLX_AUX_BUFFERS} | |
1191 | Number of auxiliary color buffers that are available. Zero indicates | |
1192 | that no auxiliary color buffers exist. | |
1193 | ||
1194 | @item @code{GLX_RED_SIZE} | |
1195 | Number of bits of red stored in each color buffer. Undefined if | |
1196 | @code{GLX_RGBA} is @code{False}. | |
1197 | ||
1198 | @item @code{GLX_GREEN_SIZE} | |
1199 | Number of bits of green stored in each color buffer. Undefined if | |
1200 | @code{GLX_RGBA} is @code{False}. | |
1201 | ||
1202 | @item @code{GLX_BLUE_SIZE} | |
1203 | Number of bits of blue stored in each color buffer. Undefined if | |
1204 | @code{GLX_RGBA} is @code{False}. | |
1205 | ||
1206 | @item @code{GLX_ALPHA_SIZE} | |
1207 | Number of bits of alpha stored in each color buffer. Undefined if | |
1208 | @code{GLX_RGBA} is @code{False}. | |
1209 | ||
1210 | @item @code{GLX_DEPTH_SIZE} | |
1211 | Number of bits in the depth buffer. | |
1212 | ||
1213 | @item @code{GLX_STENCIL_SIZE} | |
1214 | Number of bits in the stencil buffer. | |
1215 | ||
1216 | @item @code{GLX_ACCUM_RED_SIZE} | |
1217 | Number of bits of red stored in the accumulation buffer. | |
1218 | ||
1219 | @item @code{GLX_ACCUM_GREEN_SIZE} | |
1220 | Number of bits of green stored in the accumulation buffer. | |
1221 | ||
1222 | @item @code{GLX_ACCUM_BLUE_SIZE} | |
1223 | Number of bits of blue stored in the accumulation buffer. | |
1224 | ||
1225 | @item @code{GLX_ACCUM_ALPHA_SIZE} | |
1226 | Number of bits of alpha stored in the accumulation buffer. | |
1227 | ||
1228 | @end table | |
1229 | ||
1230 | The X protocol allows a single visual ID to be instantiated with | |
1231 | different numbers of bits per pixel. Windows or GLX pixmaps that will be | |
1232 | rendered with OpenGL, however, must be instantiated with a color buffer | |
1233 | depth of @code{GLX_BUFFER_SIZE}. | |
1234 | ||
1235 | Although a GLX implementation can export many visuals that support GL | |
1236 | rendering, it must support at least one RGBA visual. This visual must | |
1237 | have at least one color buffer, a stencil buffer of at least 1 bit, a | |
1238 | depth buffer of at least 12 bits, and an accumulation buffer. Alpha | |
1239 | bitplanes are optional in this visual. However, its color buffer size | |
1240 | must be as great as that of the deepest @code{TrueColor}, | |
1241 | @code{DirectColor}, @code{PseudoColor}, or @code{StaticColor} visual | |
1242 | supported on level zero, and it must itself be made available on level | |
1243 | zero. | |
1244 | ||
1245 | In addition, if the X server exports a @code{PseudoColor} or | |
1246 | @code{StaticColor} visual on framebuffer level 0, a color index visual | |
1247 | is also required on that level. It must have at least one color buffer, | |
1248 | a stencil buffer of at least 1 bit, and a depth buffer of at least 12 | |
1249 | bits. This visual must have as many color bitplanes as the deepest | |
1250 | @code{PseudoColor} or @code{StaticColor} visual supported on level 0. | |
1251 | ||
1252 | Applications are best written to select the visual that most closely | |
1253 | meets their requirements. Creating windows or GLX pixmaps with | |
1254 | unnecessary buffers can result in reduced rendering performance as well | |
1255 | as poor resource allocation. | |
1256 | ||
1257 | @heading Errors | |
1258 | @code{GLX_NO_EXTENSION} is returned if @var{dpy} does not support the | |
1259 | GLX extension. | |
1260 | ||
1261 | @code{GLX_BAD_SCREEN} is returned if the screen of @var{vis} does not | |
1262 | correspond to a screen. | |
1263 | ||
1264 | @code{GLX_BAD_ATTRIBUTE} is returned if @var{attrib} is not a valid GLX | |
1265 | attribute. | |
1266 | ||
1267 | @code{GLX_BAD_VISUAL} is returned if @var{vis} doesn't support GLX and | |
1268 | an attribute other than @code{GLX_USE_GL} is requested. | |
1269 | ||
1270 | @end defun | |
1271 | ||
1272 | @defun glXGetContextIDEXT | |
1273 | @heading get the XID for a context. | |
1274 | @heading Parameters | |
1275 | @table @asis | |
1276 | @item @var{ctx} | |
1277 | Specifies a GLX rendering context. | |
1278 | ||
1279 | @end table | |
1280 | ||
1281 | @heading Description | |
1282 | @code{glXGetContextIDEXT} returns the XID associated with a GLXContext. | |
1283 | ||
1284 | No round trip is forced to the server; unlike most X calls that return a | |
1285 | value, @code{glXGetContextIDEXT} does not flush any pending events. | |
1286 | ||
1287 | @code{glXGetContextIDEXT} is part of the @code{EXT_import_context} | |
1288 | extension, not part of the core GLX command set. If | |
1289 | _glxextstring(EXT_import_context) is included in the string returned by | |
1290 | @code{glXQueryExtensionsString}, when called with argument | |
1291 | @code{GLX_EXTENSIONS}, extension @code{EXT_import_context} is supported. | |
1292 | ||
1293 | @heading Errors | |
1294 | @code{GLXBadContext} is generated if @var{ctx} does not refer to a valid | |
1295 | context. | |
1296 | ||
1297 | @end defun | |
1298 | ||
1299 | @defun glXGetCurrentContext | |
1300 | @heading return the current context | |
1301 | @heading Description | |
1302 | @code{glXGetCurrentContext} returns the current context, as specified by | |
1303 | @code{glXMakeCurrent}. If there is no current context, @code{NULL} is | |
1304 | returned. | |
1305 | ||
1306 | @code{glXGetCurrentContext} returns client-side information. It does not | |
1307 | make a round trip to the server. | |
1308 | ||
1309 | ||
1310 | ||
1311 | @end defun | |
1312 | ||
1313 | @defun glXGetCurrentDisplay | |
1314 | @heading get display for current context | |
1315 | @heading Description | |
1316 | @code{glXGetCurrentDisplay} returns the display for the current context. | |
1317 | If no context is current, @code{NULL} is returned. | |
1318 | ||
1319 | @code{glXGetCurrentDisplay} returns client-side information. It does not | |
1320 | make a round-trip to the server, and therefore does not flush any | |
1321 | pending events. | |
1322 | ||
1323 | @end defun | |
1324 | ||
1325 | @defun glXGetCurrentDrawable | |
1326 | @heading return the current drawable | |
1327 | @heading Description | |
1328 | @code{glXGetCurrentDrawable} returns the current drawable, as specified | |
1329 | by @code{glXMakeCurrent}. If there is no current drawable, @code{None} | |
1330 | is returned. | |
1331 | ||
1332 | @code{glXGetCurrentDrawable} returns client-side information. It does | |
1333 | not make a round trip to the server. | |
1334 | ||
1335 | @end defun | |
1336 | ||
1337 | @defun glXGetCurrentReadDrawable | |
1338 | @heading return the current drawable | |
1339 | @heading Description | |
1340 | @code{glXGetCurrentReadDrawable} returns the current read drawable, as | |
1341 | specified by @code{read} parameter of @code{glXMakeContextCurrent}. If | |
1342 | there is no current drawable, @code{None} is returned. | |
1343 | ||
1344 | @code{glXGetCurrentReadDrawable} returns client-side information. It | |
1345 | does not make a round-trip to the server. | |
1346 | ||
1347 | @end defun | |
1348 | ||
1349 | @defun glXGetFBConfigAttrib | |
1350 | @heading return information about a GLX frame buffer configuration | |
1351 | @heading Parameters | |
1352 | @table @asis | |
1353 | @item @var{dpy} | |
1354 | Specifies the connection to the X server. | |
1355 | ||
1356 | @item @var{config} | |
1357 | Specifies the GLX frame buffer configuration to be queried. | |
1358 | ||
1359 | @item @var{attribute} | |
1360 | Specifies the attribute to be returned. | |
1361 | ||
1362 | @item @var{value} | |
1363 | Returns the requested value. | |
1364 | ||
1365 | @end table | |
1366 | ||
1367 | @heading Description | |
1368 | @code{glXGetFBConfigAttrib} sets @var{value} to the @var{attribute} | |
1369 | value of GLX drawables created with respect to @var{config}. | |
1370 | @code{glXGetFBConfigAttrib} returns an error code if it fails for any | |
1371 | reason. Otherwise, @code{Success} is returned. | |
1372 | ||
1373 | @var{attribute} is one of the following: | |
1374 | ||
1375 | ||
1376 | ||
1377 | @table @asis | |
1378 | @item @code{GLX_FBCONFIG_ID} | |
1379 | XID of the given GLXFBConfig. | |
1380 | ||
1381 | @item @code{GLX_BUFFER_SIZE} | |
1382 | ||
1383 | ||
1384 | Number of bits per color buffer. If the frame buffer configuration | |
1385 | supports RGBA contexts, then @code{GLX_BUFFER_SIZE} is the sum of | |
1386 | @code{GLX_RED_SIZE}, @code{GLX_GREEN_SIZE}, @code{GLX_BLUE_SIZE}, and | |
1387 | @code{GLX_ALPHA_SIZE}. If the frame buffer configuration supports only | |
1388 | color index contexts, @code{GLX_BUFFER_SIZE} is the size of the color | |
1389 | indexes. | |
1390 | ||
1391 | @item @code{GLX_LEVEL} | |
1392 | ||
1393 | ||
1394 | Frame buffer level of the configuration. Level zero is the default frame | |
1395 | buffer. Positive levels correspond to frame buffers that overlay the | |
1396 | default buffer, and negative levels correspond to frame buffers that | |
1397 | underlie the default buffer. | |
1398 | ||
1399 | @item @code{GLX_DOUBLEBUFFER} | |
1400 | ||
1401 | ||
1402 | @code{True} if color buffers exist in front/back pairs that can be | |
1403 | swapped, @code{False} otherwise. | |
1404 | ||
1405 | @item @code{GLX_STEREO} | |
1406 | ||
1407 | ||
1408 | @code{True} if color buffers exist in left/right pairs, @code{False} | |
1409 | otherwise. | |
1410 | ||
1411 | @item @code{GLX_AUX_BUFFERS} | |
1412 | ||
1413 | ||
1414 | Number of auxiliary color buffers that are available. Zero indicates | |
1415 | that no auxiliary color buffers exist. | |
1416 | ||
1417 | @item @code{GLX_RED_SIZE} | |
1418 | ||
1419 | ||
1420 | Number of bits of red stored in each color buffer. Undefined if RGBA | |
1421 | contexts are not supported by the frame buffer configuration. | |
1422 | ||
1423 | @item @code{GLX_GREEN_SIZE} | |
1424 | ||
1425 | ||
1426 | Number of bits of green stored in each color buffer. Undefined if RGBA | |
1427 | contexts are not supported by the frame buffer configuration. | |
1428 | ||
1429 | @item @code{GLX_BLUE_SIZE} | |
1430 | ||
1431 | ||
1432 | Number of bits of blue stored in each color buffer. Undefined if RGBA | |
1433 | contexts are not supported by the frame buffer configuration. | |
1434 | ||
1435 | @item @code{GLX_ALPHA_SIZE} | |
1436 | ||
1437 | ||
1438 | Number of bits of alpha stored in each color buffer. Undefined if RGBA | |
1439 | contexts are not supported by the frame buffer configuration. | |
1440 | ||
1441 | @item @code{GLX_DEPTH_SIZE} | |
1442 | ||
1443 | ||
1444 | Number of bits in the depth buffer. | |
1445 | ||
1446 | @item @code{GLX_STENCIL_SIZE} | |
1447 | ||
1448 | ||
1449 | Number of bits in the stencil buffer. | |
1450 | ||
1451 | @item @code{GLX_ACCUM_RED_SIZE} | |
1452 | ||
1453 | ||
1454 | Number of bits of red stored in the accumulation buffer. | |
1455 | ||
1456 | @item @code{GLX_ACCUM_GREEN_SIZE} | |
1457 | ||
1458 | ||
1459 | Number of bits of green stored in the accumulation buffer. | |
1460 | ||
1461 | @item @code{GLX_ACCUM_BLUE_SIZE} | |
1462 | ||
1463 | ||
1464 | Number of bits of blue stored in the accumulation buffer. | |
1465 | ||
1466 | @item @code{GLX_ACCUM_ALPHA_SIZE} | |
1467 | ||
1468 | ||
1469 | Number of bits of alpha stored in the accumulation buffer. | |
1470 | ||
1471 | @item @code{GLX_RENDER_TYPE} | |
1472 | ||
1473 | ||
1474 | Mask indicating what type of GLX contexts can be made current to the | |
1475 | frame buffer configuration. Valid bits are @code{GLX_RGBA_BIT} and | |
1476 | @code{GLX_COLOR_INDEX_BIT}. | |
1477 | ||
1478 | @item @code{GLX_DRAWABLE_TYPE} | |
1479 | ||
1480 | ||
1481 | Mask indicating what drawable types the frame buffer configuration | |
1482 | supports. Valid bits are @code{GLX_WINDOW_BIT}, @code{GLX_PIXMAP_BIT}, | |
1483 | and @code{GLX_PBUFFER_BIT}. | |
1484 | ||
1485 | @item @code{GLX_X_RENDERABLE} | |
1486 | ||
1487 | ||
1488 | @code{True} if drawables created with the frame buffer configuration can | |
1489 | be rendered to by X. | |
1490 | ||
1491 | @item @code{GLX_VISUAL_ID} | |
1492 | ||
1493 | ||
1494 | XID of the corresponding visual, or zero if there is no associated | |
1495 | visual (i.e., if @code{GLX_X_RENDERABLE} is @code{False} or | |
1496 | @code{GLX_DRAWABLE_TYPE} does not have the @code{GLX_WINDOW_BIT} bit | |
1497 | set). | |
1498 | ||
1499 | @item @code{GLX_X_VISUAL_TYPE} | |
1500 | ||
1501 | ||
1502 | Visual type of associated visual. The returned value will be one of: | |
1503 | @code{GLX_TRUE_COLOR}, @code{GLX_DIRECT_COLOR}, @code{GLX_PSEUDO_COLOR}, | |
1504 | @code{GLX_STATIC_COLOR}, @code{GLX_GRAY_SCALE}, @code{GLX_STATIC_GRAY}, | |
1505 | or @code{GLX_NONE}, if there is no associated visual (i.e., if | |
1506 | @code{GLX_X_RENDERABLE} is @code{False} or @code{GLX_DRAWABLE_TYPE} does | |
1507 | not have the @code{GLX_WINDOW_BIT} bit set). | |
1508 | ||
1509 | @item @code{GLX_CONFIG_CAVEAT} | |
1510 | ||
1511 | ||
1512 | One of @code{GLX_NONE}, @code{GLX_SLOW_CONFIG}, or | |
1513 | @code{GLX_NON_CONFORMANT_CONFIG}, indicating that the frame buffer | |
1514 | configuration has no caveats, some aspect of the frame buffer | |
1515 | configuration runs slower than other frame buffer configurations, or | |
1516 | some aspect of the frame buffer configuration is nonconformant, | |
1517 | respectively. | |
1518 | ||
1519 | @item @code{GLX_TRANSPARENT_TYPE} | |
1520 | ||
1521 | ||
1522 | One of @code{GLX_NONE}, @code{GLX_TRANSPARENT_RGB}, | |
1523 | @code{GLX_TRANSPARENT_INDEX}, indicating that the frame buffer | |
1524 | configuration is opaque, is transparent for particular values of red, | |
1525 | green, and blue, or is transparent for particular index values, | |
1526 | respectively. | |
1527 | ||
1528 | @item @code{GLX_TRANSPARENT_INDEX_VALUE} | |
1529 | ||
1530 | ||
1531 | Integer value between 0 and the maximum frame buffer value for indices, | |
1532 | indicating the transparent index value for the frame buffer | |
1533 | configuration. Undefined if @code{GLX_TRANSPARENT_TYPE} is not | |
1534 | @code{GLX_TRANSPARENT_INDEX}. | |
1535 | ||
1536 | @item @code{GLX_TRANSPARENT_RED_VALUE} | |
1537 | ||
1538 | ||
1539 | Integer value between 0 and the maximum frame buffer value for red, | |
1540 | indicating the transparent red value for the frame buffer configuration. | |
1541 | Undefined if @code{GLX_TRANSPARENT_TYPE} is not | |
1542 | @code{GLX_TRANSPARENT_RGB}. | |
1543 | ||
1544 | @item @code{GLX_TRANSPARENT_GREEN_VALUE} | |
1545 | ||
1546 | ||
1547 | Integer value between 0 and the maximum frame buffer value for green, | |
1548 | indicating the transparent green value for the frame buffer | |
1549 | configuration. Undefined if @code{GLX_TRANSPARENT_TYPE} is not | |
1550 | @code{GLX_TRANSPARENT_RGB}. | |
1551 | ||
1552 | @item @code{GLX_TRANSPARENT_BLUE_VALUE} | |
1553 | ||
1554 | ||
1555 | Integer value between 0 and the maximum frame buffer value for blue, | |
1556 | indicating the transparent blue value for the frame buffer | |
1557 | configuration. Undefined if @code{GLX_TRANSPARENT_TYPE} is not | |
1558 | @code{GLX_TRANSPARENT_RGB}. | |
1559 | ||
1560 | @item @code{GLX_TRANSPARENT_ALPHA_VALUE} | |
1561 | ||
1562 | ||
1563 | Integer value between 0 and the maximum frame buffer value for alpha, | |
1564 | indicating the transparent blue value for the frame buffer | |
1565 | configuration. Undefined if @code{GLX_TRANSPARENT_TYPE} is not | |
1566 | @code{GLX_TRANSPARENT_RGB}. | |
1567 | ||
1568 | @item @code{GLX_MAX_PBUFFER_WIDTH} | |
1569 | ||
1570 | ||
1571 | The maximum width that can be specified to @code{glXCreatePbuffer}. | |
1572 | ||
1573 | @item @code{GLX_MAX_PBUFFER_HEIGHT} | |
1574 | ||
1575 | ||
1576 | The maximum height that can be specified to @code{glXCreatePbuffer}. | |
1577 | ||
1578 | @item @code{GLX_MAX_PBUFFER_PIXELS} | |
1579 | ||
1580 | ||
1581 | The maximum number of pixels (width times height) for a pixel buffer. | |
1582 | Note that this value may be less than @code{GLX_MAX_PBUFFER_WIDTH} times | |
1583 | @code{GLX_MAX_PBUFFER_HEIGHT}. Also, this value is static and assumes | |
1584 | that no other pixel buffers or X resources are contending for the frame | |
1585 | buffer memory. As a result, it may not be possible to allocate a pixel | |
1586 | buffer of the size given by @code{GLX_MAX_PBUFFER_PIXELS}. | |
1587 | ||
1588 | @end table | |
1589 | ||
1590 | Applications should choose the frame buffer configuration that most | |
1591 | closely meets their requirements. Creating windows, GLX pixmaps, or GLX | |
1592 | pixel buffers with unnecessary buffers can result in reduced rendering | |
1593 | performance as well as poor resource allocation. | |
1594 | ||
1595 | @heading Errors | |
1596 | @code{GLX_NO_EXTENSION} is returned if @var{dpy} does not support the | |
1597 | GLX extension. @code{GLX_BAD_ATTRIBUTE} is returned if @var{attribute} | |
1598 | is not a valid GLX attribute. | |
1599 | ||
1600 | @end defun | |
1601 | ||
1602 | @defun glXGetFBConfigs | |
1603 | @heading list all GLX frame buffer configurations for a given screen | |
1604 | @heading Parameters | |
1605 | @table @asis | |
1606 | @item @var{dpy} | |
1607 | Specifies the connection to the X server. | |
1608 | ||
1609 | @item @var{screen} | |
1610 | Specifies the screen number. | |
1611 | ||
1612 | @item @var{nelements} | |
1613 | Returns the number of GLXFBConfigs returned. | |
1614 | ||
1615 | @end table | |
1616 | ||
1617 | @heading Description | |
1618 | @code{glXGetFBConfigs} returns a list of all GLXFBConfigs available on | |
1619 | the screen specified by @var{screen}. Use @code{glXGetFBConfigAttrib} to | |
1620 | obtain attribute values from a specific GLXFBConfig. | |
1621 | ||
1622 | @end defun | |
1623 | ||
1624 | @defun glXGetProcAddress | |
1625 | @heading obtain a pointer to an OpenGL or GLX function | |
1626 | @heading Parameters | |
1627 | @table @asis | |
1628 | @item @var{procName} | |
1629 | Specifies the name of the OpenGL or GLX function whose address is to be | |
1630 | returned. | |
1631 | ||
1632 | @end table | |
1633 | ||
1634 | @heading Description | |
1635 | @code{glXGetProcAddress} returns the address of the function specified | |
1636 | in @var{procName}. This is necessary in environments where the OpenGL | |
1637 | link library exports a different set of functions than the runtime | |
1638 | library. | |
1639 | ||
1640 | @end defun | |
1641 | ||
1642 | @defun glXGetSelectedEvent | |
1643 | @heading returns GLX events that are selected for a window or a GLX pixel buffer | |
1644 | @heading Parameters | |
1645 | @table @asis | |
1646 | @item @var{dpy} | |
1647 | Specifies the connection to the X server. | |
1648 | ||
1649 | @item @var{draw} | |
1650 | Specifies a GLX drawable. Must be a GLX pixel buffer or a window. | |
1651 | ||
1652 | @item @var{event_mask} | |
1653 | Returns the events that are selected for @var{draw}. | |
1654 | ||
1655 | @end table | |
1656 | ||
1657 | @heading Description | |
1658 | @code{glXGetSelectedEvent} returns in @var{event_mask} the events | |
1659 | selected for @var{draw}. | |
1660 | ||
1661 | @heading Errors | |
1662 | @code{GLXBadDrawable} is generated if @var{draw} is not a valid window | |
1663 | or a valid GLX pixel buffer. | |
1664 | ||
1665 | @end defun | |
1666 | ||
1667 | @defun glXGetVisualFromFBConfig | |
1668 | @heading return visual that is associated with the frame buffer configuration | |
1669 | @heading Parameters | |
1670 | @table @asis | |
1671 | @item @var{dpy} | |
1672 | Specifies the connection to the X server. | |
1673 | ||
1674 | @item @var{config} | |
1675 | Specifies the GLX frame buffer configuration. | |
1676 | ||
1677 | @end table | |
1678 | ||
1679 | @heading Description | |
1680 | If @var{config} is a valid GLX frame buffer configuration and it has an | |
1681 | associated X Visual, then information describing that visual is | |
1682 | returned; otherwise @code{NULL} is returned. Use @code{XFree} to free | |
1683 | the data returned. | |
1684 | ||
1685 | @heading Errors | |
1686 | Returns @code{NULL} if @var{config} is not a valid GLXFBConfig. | |
1687 | ||
1688 | @end defun | |
1689 | ||
1690 | @defun glXImportContextEXT | |
1691 | @heading import another process's indirect rendering context. | |
1692 | @heading Parameters | |
1693 | @table @asis | |
1694 | @item @var{dpy} | |
1695 | Specifies the connection to the X server. | |
1696 | ||
1697 | @item @var{contextID} | |
1698 | Specifies a GLX rendering context. | |
1699 | ||
1700 | @end table | |
1701 | ||
1702 | @heading Description | |
1703 | @code{glXImportContextEXT} creates a GLXContext given the XID of an | |
1704 | existing GLXContext. It may be used in place of @code{glXCreateContext}, | |
1705 | to share another process's indirect rendering context. | |
1706 | ||
1707 | Only the server-side context information can be shared between X | |
1708 | clients; client-side state, such as pixel storage modes, cannot be | |
1709 | shared. Thus, @code{glXImportContextEXT} must allocate memory to store | |
1710 | client-side information. This memory is freed by calling | |
1711 | @code{glXFreeContextEXT}. | |
1712 | ||
1713 | This call does not create a new XID. It merely makes an existing object | |
1714 | available to the importing client (Display *). Like any XID, it goes | |
1715 | away when the creating client drops its connection or the ID is | |
1716 | explicitly deleted. Note that this is when the XID goes away. The object | |
1717 | goes away when the XID goes away AND the context is not current to any | |
1718 | thread. | |
1719 | ||
1720 | If @var{contextID} refers to a direct rendering context then no error is | |
1721 | generated but @code{glXImportContextEXT} returns NULL. | |
1722 | ||
1723 | @code{glXImportContextEXT} is part of the @code{EXT_import_context} | |
1724 | extension, not part of the core GLX command set. If | |
1725 | _glxextstring(EXT_import_context) is included in the string returned by | |
1726 | @code{glXQueryExtensionsString}, when called with argument | |
1727 | @code{GLX_EXTENSIONS}, extension @code{EXT_import_context} is supported. | |
1728 | ||
1729 | @heading Errors | |
1730 | @code{GLXBadContext} is generated if @var{contextID} does not refer to a | |
1731 | valid context. | |
1732 | ||
1733 | @end defun | |
1734 | ||
1735 | @defun glXIntro | |
1736 | @heading Introduction to OpenGL in the X window system | |
1737 | @end defun | |
1738 | ||
1739 | @defun glXIsDirect | |
1740 | @heading indicate whether direct rendering is enabled | |
1741 | @heading Parameters | |
1742 | @table @asis | |
1743 | @item @var{dpy} | |
1744 | Specifies the connection to the X server. | |
1745 | ||
1746 | @item @var{ctx} | |
1747 | Specifies the GLX context that is being queried. | |
1748 | ||
1749 | @end table | |
1750 | ||
1751 | @heading Description | |
1752 | @code{glXIsDirect} returns @code{True} if @var{ctx} is a direct | |
1753 | rendering context, @code{False} otherwise. Direct rendering contexts | |
1754 | pass rendering commands directly from the calling process's address | |
1755 | space to the rendering system, bypassing the X server. Nondirect | |
1756 | rendering contexts pass all rendering commands to the X server. | |
1757 | ||
1758 | @heading Errors | |
1759 | @code{GLXBadContext} is generated if @var{ctx} is not a valid GLX | |
1760 | context. | |
1761 | ||
1762 | @end defun | |
1763 | ||
1764 | @defun glXMakeContextCurrent | |
1765 | @heading attach a GLX context to a GLX drawable | |
1766 | @heading Parameters | |
1767 | @table @asis | |
1768 | @item @var{display} | |
1769 | Specifies the connection to the X server. | |
1770 | ||
1771 | @item @var{draw} | |
1772 | Specifies a GLX drawable to render into. Must be an XID representing a | |
1773 | GLXWindow, GLXPixmap, or GLXPbuffer. | |
1774 | ||
1775 | @item @var{read} | |
1776 | Specifies a GLX drawable to read from. Must be an XID representing a | |
1777 | GLXWindow, GLXPixmap, or GLXPbuffer. | |
1778 | ||
1779 | @item @var{ctx} | |
1780 | Specifies the GLX context to be bound to @var{read} and @var{ctx}. | |
1781 | ||
1782 | @end table | |
1783 | ||
1784 | @heading Description | |
1785 | @code{glXMakeContextCurrent} binds @var{ctx} to the current rendering | |
1786 | thread and to the @var{draw} and @var{read} GLX drawables. @var{draw} | |
1787 | and @var{read} may be the same. | |
1788 | ||
1789 | @var{draw} is used for all OpenGL operations except: | |
1790 | ||
1791 | Any pixel data that are read based on the value of | |
1792 | @code{GLX_READ_BUFFER}. Note that accumulation operations use the value | |
1793 | of @code{GLX_READ_BUFFER}, but are not allowed unless @var{draw} is | |
1794 | identical to @var{read}. | |
1795 | ||
1796 | Any depth values that are retrieved by @code{glReadPixels} or | |
1797 | @code{glCopyPixels}. | |
1798 | ||
1799 | Any stencil values that are retrieved by @code{glReadPixels} or | |
1800 | @code{glCopyPixels}. | |
1801 | ||
1802 | Frame buffer values are taken from @var{draw}. | |
1803 | ||
1804 | If the current rendering thread has a current rendering context, that | |
1805 | context is flushed and replaced by @var{ctx}. | |
1806 | ||
1807 | The first time that @var{ctx} is made current, the viewport and scissor | |
1808 | dimensions are set to the size of the @var{draw} drawable. The viewport | |
1809 | and scissor are not modified when @var{ctx} is subsequently made | |
1810 | current. | |
1811 | ||
1812 | To release the current context without assigning a new one, call | |
1813 | @code{glXMakeContextCurrent} with @var{draw} and @var{read} set to | |
1814 | @code{None} and @var{ctx} set to @code{NULL}. | |
1815 | ||
1816 | @code{glXMakeContextCurrent} returns @code{True} if it is successful, | |
1817 | @code{False} otherwise. If @code{False} is returned, the previously | |
1818 | current rendering context and drawable (if any) remain unchanged. | |
1819 | ||
1820 | @heading Errors | |
1821 | @code{BadMatch} is generated if @var{draw} and @var{read} are not | |
1822 | compatible. | |
1823 | ||
1824 | @code{BadAccess} is generated if @var{ctx} is current to some other | |
1825 | thread. | |
1826 | ||
1827 | @code{GLXContextState} is generated if there is a current rendering | |
1828 | context and its render mode is either @code{GLX_FEEDBACK} or | |
1829 | @code{GLX_SELECT}. | |
1830 | ||
1831 | @code{GLXBadContext} is generated if @var{ctx} is not a valid GLX | |
1832 | rendering context. | |
1833 | ||
1834 | @code{GLXBadDrawable} is generated if @var{draw} or @var{read} is not a | |
1835 | valid GLX drawable. | |
1836 | ||
1837 | @code{GLXBadWindow} is generated if the underlying X window for either | |
1838 | @var{draw} or @var{read} is no longer valid. | |
1839 | ||
1840 | @code{GLXBadCurrentDrawable} is generated if the previous context of the | |
1841 | calling thread has unflushed commands and the previous drawable is no | |
1842 | longer valid. | |
1843 | ||
1844 | @code{BadAlloc} is generated if the X server does not have enough | |
1845 | resources to allocate the buffers. | |
1846 | ||
1847 | @code{BadMatch} is generated if: | |
1848 | ||
1849 | @var{draw} and @var{read} cannot fit into frame buffer memory | |
1850 | simultaneously. | |
1851 | ||
1852 | @var{draw} or @var{read} is a GLXPixmap and @var{ctx} is a | |
1853 | direct-rendering context. | |
1854 | ||
1855 | @var{draw} or @var{read} is a GLXPixmap and @var{ctx} was previously | |
1856 | bound to a GLXWindow or GLXPbuffer. | |
1857 | ||
1858 | @var{draw} or @var{read} is a GLXWindow or GLXPbuffer and @var{ctx} was | |
1859 | previously bound to a GLXPixmap. | |
1860 | ||
1861 | @end defun | |
1862 | ||
1863 | @defun glXMakeCurrent | |
1864 | @heading attach a GLX context to a window or a GLX pixmap | |
1865 | @heading Parameters | |
1866 | @table @asis | |
1867 | @item @var{dpy} | |
1868 | Specifies the connection to the X server. | |
1869 | ||
1870 | @item @var{drawable} | |
1871 | Specifies a GLX drawable. Must be either an X window ID or a GLX pixmap | |
1872 | ID. | |
1873 | ||
1874 | @item @var{ctx} | |
1875 | Specifies a GLX rendering context that is to be attached to | |
1876 | @var{drawable}. | |
1877 | ||
1878 | @end table | |
1879 | ||
1880 | @heading Description | |
1881 | @code{glXMakeCurrent} does two things: It makes @var{ctx} the current | |
1882 | GLX rendering context of the calling thread, replacing the previously | |
1883 | current context if there was one, and it attaches @var{ctx} to a GLX | |
1884 | drawable, either a window or a GLX pixmap. As a result of these two | |
1885 | actions, subsequent GL rendering calls use rendering context @var{ctx} | |
1886 | to modify GLX drawable @var{drawable} (for reading and writing). Because | |
1887 | @code{glXMakeCurrent} always replaces the current rendering context with | |
1888 | @var{ctx}, there can be only one current context per thread. | |
1889 | ||
1890 | Pending commands to the previous context, if any, are flushed before it | |
1891 | is released. | |
1892 | ||
1893 | The first time @var{ctx} is made current to any thread, its viewport is | |
1894 | set to the full size of @var{drawable}. Subsequent calls by any thread | |
1895 | to @code{glXMakeCurrent} with @var{ctx} have no effect on its viewport. | |
1896 | ||
1897 | To release the current context without assigning a new one, call | |
1898 | @code{glXMakeCurrent} with @var{drawable} set to @code{None} and | |
1899 | @var{ctx} set to @code{NULL}. | |
1900 | ||
1901 | @code{glXMakeCurrent} returns @code{True} if it is successful, | |
1902 | @code{False} otherwise. If @code{False} is returned, the previously | |
1903 | current rendering context and drawable (if any) remain unchanged. | |
1904 | ||
1905 | @heading Errors | |
1906 | @code{BadMatch} is generated if @var{drawable} was not created with the | |
1907 | same X screen and visual as @var{ctx}. It is also generated if | |
1908 | @var{drawable} is @code{None} and @var{ctx} is not @code{NULL}. | |
1909 | ||
1910 | @code{BadAccess} is generated if @var{ctx} was current to another thread | |
1911 | at the time @code{glXMakeCurrent} was called. | |
1912 | ||
1913 | @code{GLXBadDrawable} is generated if @var{drawable} is not a valid GLX | |
1914 | drawable. | |
1915 | ||
1916 | @code{GLXBadContext} is generated if @var{ctx} is not a valid GLX | |
1917 | context. | |
1918 | ||
1919 | @code{GLXBadContextState} is generated if @code{glXMakeCurrent} is | |
1920 | executed between the execution of @code{glBegin} and the corresponding | |
1921 | execution of @code{glEnd}. | |
1922 | ||
1923 | @code{GLXBadContextState} is also generated if the rendering context | |
1924 | current to the calling thread has GL renderer state @code{GLX_FEEDBACK} | |
1925 | or @code{GLX_SELECT}. | |
1926 | ||
1927 | @code{GLXBadCurrentWindow} is generated if there are pending GL commands | |
1928 | for the previous context and the current drawable is a window that is no | |
1929 | longer valid. | |
1930 | ||
1931 | @code{BadAlloc} may be generated if the server has delayed allocation of | |
1932 | ancillary buffers until @code{glXMakeCurrent} is called, only to find | |
1933 | that it has insufficient resources to complete the allocation. | |
1934 | ||
1935 | @end defun | |
1936 | ||
1937 | @defun glXQueryContextInfoEXT | |
1938 | @heading query context information | |
1939 | @heading Parameters | |
1940 | @table @asis | |
1941 | @item @var{dpy} | |
1942 | Specifies the connection to the X server. | |
1943 | ||
1944 | @item @var{ctx} | |
1945 | Specifies a GLX rendering context. | |
1946 | ||
1947 | @item @var{attribute} | |
1948 | Specifies that a context parameter should be retrieved. Must be one of | |
1949 | @code{GLX_SHARED_CONTEXT_EXT}, @code{GLX_VISUAL_ID_EXT}, or | |
1950 | @code{GLX_SCREEN_EXT}. | |
1951 | ||
1952 | @item @var{value} | |
1953 | Contains the return value for @var{attribute}. | |
1954 | ||
1955 | @end table | |
1956 | ||
1957 | @heading Description | |
1958 | @code{glXQueryContextInfoEXT} sets @var{value} to the value of | |
1959 | @var{attribute} with respect to @var{ctx}. @code{glXQueryContextInfoEXT} | |
1960 | returns an error code if it fails for any reason. Otherwise, | |
1961 | @code{Success} is returned. | |
1962 | ||
1963 | @var{attribute} may be one of the following: | |
1964 | ||
1965 | @table @asis | |
1966 | @item @code{GLX_SHARED_CONTEXT_EXT} | |
1967 | Returns the XID of the share list context associated with @var{ctx} at | |
1968 | its creation. | |
1969 | ||
1970 | @item @code{GLX_VISUAL_ID_EXT} | |
1971 | Returns the XID of the GLX Visual associated with @var{ctx}. | |
1972 | ||
1973 | @item @code{GLX_SCREEN_EXT} | |
1974 | Returns the screen number associated with @var{ctx}. | |
1975 | ||
1976 | @end table | |
1977 | ||
1978 | This call may cause a round-trip to the server. | |
1979 | ||
1980 | @code{glXQueryContextInfoEXT} is part of the @code{EXT_import_context} | |
1981 | extension, not part of the core GLX command set. If | |
1982 | _glxextstring(EXT_import_context) is included in the string returned by | |
1983 | @code{glXQueryExtensionsString}, when called with argument | |
1984 | @code{GLX_EXTENSIONS}, extension @code{EXT_import_context} is supported. | |
1985 | ||
1986 | @heading Errors | |
1987 | @code{GLXBadContext} is generated if @var{ctx} does not refer to a valid | |
1988 | context. | |
1989 | ||
1990 | @code{GLX_BAD_ATTRIBUTE} is returned if @var{attribute} is not a valid | |
1991 | GLX context attribute. | |
1992 | ||
1993 | fred @code{GLX_BAD_CONTEXT} is returned if @var{attribute} is not a | |
1994 | valid context. | |
1995 | ||
1996 | @end defun | |
1997 | ||
1998 | @defun glXQueryContext | |
1999 | @heading query context information | |
2000 | @heading Parameters | |
2001 | @table @asis | |
2002 | @item @var{dpy} | |
2003 | Specifies the connection to the X server. | |
2004 | ||
2005 | @item @var{ctx} | |
2006 | Specifies a GLX rendering context. | |
2007 | ||
2008 | @item @var{attribute} | |
2009 | Specifies that a context parameter should be retrieved. Must be one of | |
2010 | @code{GLX_FBCONFIG_ID}, @code{GLX_RENDER_TYPE}, or @code{GLX_SCREEN}. | |
2011 | ||
2012 | @item @var{value} | |
2013 | Contains the return value for @var{attribute}. | |
2014 | ||
2015 | @end table | |
2016 | ||
2017 | @heading Description | |
2018 | @code{glXQueryContext} sets @var{value} to the value of @var{attribute} | |
2019 | with respect to @var{ctx}. @var{attribute} may be one of the following: | |
2020 | ||
2021 | @table @asis | |
2022 | @item @code{GLX_FBCONFIG_ID} | |
2023 | Returns the XID of the GLXFBConfig associated with @var{ctx}. | |
2024 | ||
2025 | @item @code{GLX_RENDER_TYPE} | |
2026 | Returns the rendering type supported by @var{ctx}. | |
2027 | ||
2028 | @item @code{GLX_SCREEN} | |
2029 | Returns the screen number associated with @var{ctx}. | |
2030 | ||
2031 | @end table | |
2032 | ||
2033 | @code{Success} is returned unless @var{attribute} is not a valid GLX | |
2034 | context attribute, in which case @code{GLX_BAD_ATTRIBUTE} is returned. | |
2035 | ||
2036 | This call may cause a round-trip to the server. | |
2037 | ||
2038 | @heading Errors | |
2039 | @code{GLXBadContext} is generated if @var{ctx} does not refer to a valid | |
2040 | context. | |
2041 | ||
2042 | @end defun | |
2043 | ||
2044 | @defun glXQueryDrawable | |
2045 | @heading returns an attribute assoicated with a GLX drawable | |
2046 | @heading Parameters | |
2047 | @table @asis | |
2048 | @item @var{dpy} | |
2049 | Specifies the connection to the X server. | |
2050 | ||
2051 | @item @var{draw} | |
2052 | Specifies the GLX drawable to be queried. | |
2053 | ||
2054 | @item @var{attribute} | |
2055 | Specifies the attribute to be returned. Must be one of @code{GLX_WIDTH}, | |
2056 | @code{GLX_HEIGHT}, @code{GLX_PRESERVED_CONTENTS}, | |
2057 | @code{GLX_LARGEST_PBUFFER}, or @code{GLX_FBCONFIG_ID}. | |
2058 | ||
2059 | @item @var{value} | |
2060 | Contains the return value for @var{attribute}. | |
2061 | ||
2062 | @end table | |
2063 | ||
2064 | @heading Description | |
2065 | @code{glXQueryDrawable} sets @var{value} to the value of @var{attribute} | |
2066 | with respect to the GLXDrawable @var{draw}. | |
2067 | ||
2068 | @var{attribute} may be one of the following: | |
2069 | ||
2070 | @table @asis | |
2071 | @item @code{GLX_WIDTH} | |
2072 | Returns the width of @var{ctx}. | |
2073 | ||
2074 | @item @code{GLX_HEIGHT} | |
2075 | Returns the height of @var{ctx}. | |
2076 | ||
2077 | @item @code{GLX_PRESERVED_CONTENTS} | |
2078 | Returns @code{True} if the contents of a GLXPbuffer are preserved when a | |
2079 | resource conflict occurs; @code{False} otherwise. | |
2080 | ||
2081 | @item @code{GLX_LARGEST_PBUFFER} | |
2082 | Returns the value set when @code{glXCreatePbuffer} was called to create | |
2083 | the GLXPbuffer. If @code{False} is returned, then the call to | |
2084 | @code{glXCreatePbuffer} will fail to create a GLXPbuffer if the | |
2085 | requested size is larger than the implementation maximum or available | |
2086 | resources. If @code{True} is returned, a GLXPbuffer of the maximum | |
2087 | availble size (if less than the requested width and height) is created. | |
2088 | ||
2089 | @item @code{GLX_FBCONFIG_ID} | |
2090 | Returns the XID for @var{draw}. | |
2091 | ||
2092 | @end table | |
2093 | ||
2094 | If @var{draw} is a GLXWindow or GLXPixmap and @var{attribute} is set to | |
2095 | @code{GLX_PRESERVED_CONTENTS} or @code{GLX_LARGETST_PBUFFER}, the | |
2096 | contents of @var{value} are undefined. If @var{attribute} is not one of | |
2097 | the attributes listed above, the contents of @var{value} are unedfined. | |
2098 | ||
2099 | @heading Errors | |
2100 | A @code{GLXBadDrawable} is generated if @var{draw} is not a valid | |
2101 | GLXDrawable. | |
2102 | ||
2103 | @end defun | |
2104 | ||
2105 | @defun glXQueryExtensionsString | |
2106 | @heading return list of supported extensions | |
2107 | @heading Parameters | |
2108 | @table @asis | |
2109 | @item @var{dpy} | |
2110 | Specifies the connection to the X server. | |
2111 | ||
2112 | @item @var{screen} | |
2113 | Specifies the screen number. | |
2114 | ||
2115 | @end table | |
2116 | ||
2117 | @heading Description | |
2118 | @code{glXQueryExtensionsString} returns a pointer to a string describing | |
2119 | which GLX extensions are supported on the connection. The string is | |
2120 | null-terminated and contains a space-separated list of extension names. | |
2121 | (The extension names themselves never contain spaces.) If there are no | |
2122 | extensions to GLX, then the empty string is returned. | |
2123 | ||
2124 | @end defun | |
2125 | ||
2126 | @defun glXQueryExtension | |
2127 | @heading indicate whether the GLX extension is supported | |
2128 | @heading Parameters | |
2129 | @table @asis | |
2130 | @item @var{dpy} | |
2131 | Specifies the connection to the X server. | |
2132 | ||
2133 | @item @var{errorBase} | |
2134 | Returns the base error code of the GLX server extension. | |
2135 | ||
2136 | @item @var{eventBase} | |
2137 | Returns the base event code of the GLX server extension. | |
2138 | ||
2139 | @end table | |
2140 | ||
2141 | @heading Description | |
2142 | @code{glXQueryExtension} returns @code{True} if the X server of | |
2143 | connection @var{dpy} supports the GLX extension, @code{False} otherwise. | |
2144 | If @code{True} is returned, then @var{errorBase} and @var{eventBase} | |
2145 | return the error base and event base of the GLX extension. These values | |
2146 | should be added to the constant error and event values to determine the | |
2147 | actual event or error values. Otherwise, @var{errorBase} and | |
2148 | @var{eventBase} are unchanged. | |
2149 | ||
2150 | @var{errorBase} and @var{eventBase} do not return values if they are | |
2151 | specified as @code{NULL}. | |
2152 | ||
2153 | @end defun | |
2154 | ||
2155 | @defun glXQueryServerString | |
2156 | @heading return string describing the server | |
2157 | @heading Parameters | |
2158 | @table @asis | |
2159 | @item @var{dpy} | |
2160 | Specifies the connection to the X server. | |
2161 | ||
2162 | @item @var{screen} | |
2163 | Specifies the screen number. | |
2164 | ||
2165 | @item @var{name} | |
2166 | Specifies which string is returned: one of @code{GLX_VENDOR}, | |
2167 | @code{GLX_VERSION}, or @code{GLX_EXTENSIONS}. | |
2168 | ||
2169 | @end table | |
2170 | ||
2171 | @heading Description | |
2172 | @code{glXQueryServerString} returns a pointer to a static, | |
2173 | null-terminated string describing some aspect of the server's GLX | |
2174 | extension. The possible values for @var{name} and the format of the | |
2175 | strings is the same as for @code{glXGetClientString}. If @var{name} is | |
2176 | not set to a recognized value, @code{NULL} is returned. | |
2177 | ||
2178 | @end defun | |
2179 | ||
2180 | @defun glXQueryVersion | |
2181 | @heading return the version numbers of the GLX extension | |
2182 | @heading Parameters | |
2183 | @table @asis | |
2184 | @item @var{dpy} | |
2185 | Specifies the connection to the X server. | |
2186 | ||
2187 | @item @var{major} | |
2188 | Returns the major version number of the GLX server extension. | |
2189 | ||
2190 | @item @var{minor} | |
2191 | Returns the minor version number of the GLX server extension. | |
2192 | ||
2193 | @end table | |
2194 | ||
2195 | @heading Description | |
2196 | @code{glXQueryVersion} returns the major and minor version numbers of | |
2197 | the GLX extension implemented by the server associated with connection | |
2198 | @var{dpy}. Implementations with the same major version number are upward | |
2199 | compatible, meaning that the implementation with the higher minor number | |
2200 | is a superset of the version with the lower minor number. | |
2201 | ||
2202 | @var{major} and @var{minor} do not return values if they are specified | |
2203 | as @code{NULL}. | |
2204 | ||
2205 | @heading Errors | |
2206 | @code{glXQueryVersion} returns @code{False} if it fails, @code{True} | |
2207 | otherwise. | |
2208 | ||
2209 | @var{major} and @var{minor} are not updated when @code{False} is | |
2210 | returned. | |
2211 | ||
2212 | @end defun | |
2213 | ||
2214 | @defun glXSelectEvent | |
2215 | @heading select GLX events for a window or a GLX pixel buffer | |
2216 | @heading Parameters | |
2217 | @table @asis | |
2218 | @item @var{dpy} | |
2219 | Specifies the connection to the X server. | |
2220 | ||
2221 | @item @var{draw} | |
2222 | Specifies a GLX drawable. Must be a GLX pixel buffer or a window. | |
2223 | ||
2224 | @item @var{event_mask} | |
2225 | Specifies the events to be returned for @var{draw}. | |
2226 | ||
2227 | @end table | |
2228 | ||
2229 | @heading Description | |
2230 | @code{glXSelectEvent} sets the GLX event mask for a GLX pixel buffer or | |
2231 | a window. Calling @code{glXSelectEvent} overrides any previous event | |
2232 | mask that was set by the client for @var{draw}. Note that it does not | |
2233 | affect the event masks that other clients may have specified for | |
2234 | @var{draw} since each client rendering to @var{draw} has a separate | |
2235 | event mask for it. | |
2236 | ||
2237 | Currently, only one GLX event, @code{GLX_PBUFFER_CLOBBER_MASK}, can be | |
2238 | selected. The following data is returned to the client when a | |
2239 | @code{GLX_PBUFFER_CLOBBER_MASK} event occurs: | |
2240 | ||
2241 | typedef struct @{ | |
2242 | ||
2243 | @table @asis | |
2244 | @item | |
2245 | int @var{event_type}; | |
2246 | /* GLX_DAMAGED or GLX_SAVED */ | |
2247 | ||
2248 | @item | |
2249 | int @var{draw_type}; | |
2250 | /* GLX_WINDOW or GLX_PBUFFER */ | |
2251 | ||
2252 | @item | |
2253 | unsigned long @var{serial}; | |
2254 | /* # of last request processed by server */ | |
2255 | ||
2256 | @item | |
2257 | Bool @var{send_event}; | |
2258 | /* true if this came for SendEvent request */ | |
2259 | ||
2260 | @item | |
2261 | Display @var{*display}; | |
2262 | /* display the event was read from */ | |
2263 | ||
2264 | @item | |
2265 | GLXDrawable @var{drawable}; | |
2266 | /* i.d. of Drawable */ | |
2267 | ||
2268 | @item | |
2269 | unsigned int @var{buffer_mask}; | |
2270 | /* mask indicating affected buffers */ | |
2271 | ||
2272 | @item | |
2273 | int @var{x, y}; | |
2274 | ||
2275 | ||
2276 | @item | |
2277 | int @var{width, height}; | |
2278 | ||
2279 | ||
2280 | @item | |
2281 | int @var{count}; | |
2282 | /* if nonzero, at least this many more */ | |
2283 | ||
2284 | @end table | |
2285 | ||
2286 | @} GLXPbufferClobberEvent; The valid bit masks used in @var{buffer_mask} | |
2287 | are: | |
2288 | ||
2289 | ||
2290 | ||
2291 | @table @asis | |
2292 | @item @strong{Bitmask} | |
2293 | @strong{Corresponding Buffer} | |
2294 | ||
2295 | @item @code{GLX_FRONT_LEFT_BUFFER_BIT} | |
2296 | Front left color buffer | |
2297 | ||
2298 | @item @code{GLX_FRONT_RIGHT_BUFFER_BIT} | |
2299 | Front right color buffer | |
2300 | ||
2301 | @item @code{GLX_BACK_LEFT_BUFFER_BIT} | |
2302 | Back left color buffer | |
2303 | ||
2304 | @item @code{GLX_BACK_RIGHT_BUFFER_BIT} | |
2305 | Back right color buffer | |
2306 | ||
2307 | @item @code{GLX_AUX_BUFFERS_BIT} | |
2308 | Auxiliary buffer | |
2309 | ||
2310 | @item @code{GLX_DEPTH_BUFFER_BIT} | |
2311 | Depth buffer | |
2312 | ||
2313 | @item @code{GLX_STENCIL_BUFFER_BIT} | |
2314 | Stencil buffer | |
2315 | ||
2316 | @item @code{GLX_ACCUM_BUFFER_BIT} | |
2317 | Accumulation buffer | |
2318 | ||
2319 | @end table | |
2320 | ||
2321 | A single X server operation can cause several buffer clobber events to | |
2322 | be sent. (e.g., a single GLX pixel buffer may be damaged and cause | |
2323 | multiple buffer clobber events to be generated). Each event specifies | |
2324 | one region of the GLX drawable that was affected by the X Server | |
2325 | operation. The @var{buffer_mask} field indicates which color buffers and | |
2326 | ancillary buffers were affected. All the buffer clobber events generated | |
2327 | by a single X server action are guaranteed to be contiguous in the event | |
2328 | queue. The conditions under which this event is generated and the | |
2329 | @var{event_type} varies, depending on the type of the GLX drawable. | |
2330 | ||
2331 | When the @code{GLX_AUX_BUFFERS_BIT} is set in @var{buffer_mask}, then | |
2332 | @var{aux_buffer} is set to indicate which buffer was affected. If more | |
2333 | than one aux buffer was affected, then additional events are generated | |
2334 | as part of the same contiguous event group. Each additional event will | |
2335 | have only the @code{GLX_AUX_BUFFERS_BIT} set in @var{buffer_mask}, and | |
2336 | the @var{aux_buffer} field will be set appropriately. For nonstereo | |
2337 | drawables, @code{GLX_FRONT_LEFT_BUFFER_BIT} and | |
2338 | @code{GLX_BACK_LEFT_BUFFER_BIT} are used to specify the front and back | |
2339 | color buffers. | |
2340 | ||
2341 | For preserved GLX pixel buffers, a buffer clobber event with type | |
2342 | @code{GLX_SAVED} is generated whenever the contents of the GLX pixel | |
2343 | buffer is moved out of offscreen memory. The event(s) describes which | |
2344 | portions of the GLX pixel buffer were affected. Clients who receive many | |
2345 | buffer clobber events, referring to different save actions, should | |
2346 | consider freeing the GLX pixel buffer resource in order to prevent the | |
2347 | system from thrashing due to insufficient resources. | |
2348 | ||
2349 | For an unpreserved GLXPbuffer, a buffer clobber event, with type | |
2350 | @code{GLX_DAMAGED}, is generated whenever a portion of the GLX pixel | |
2351 | buffer becomes invalid. The client may wish to regenerate the invalid | |
2352 | portions of the GLX pixel buffer. | |
2353 | ||
2354 | For Windows, buffer clobber events, with type @code{GLX_SAVED}, occur | |
2355 | whenever an ancillary buffer, associated with the window, gets clobbered | |
2356 | or moved out of off-screen memory. The event contains information | |
2357 | indicating which color buffers and ancillary buffers\(emand which | |
2358 | portions of those buffers\(emwere affected. | |
2359 | ||
2360 | @heading Errors | |
2361 | @code{GLXBadDrawable} is generated if @var{draw} is not a valid window | |
2362 | or a valid GLX pixel buffer. | |
2363 | ||
2364 | @end defun | |
2365 | ||
2366 | @defun glXSwapBuffers | |
2367 | @heading exchange front and back buffers | |
2368 | @heading Parameters | |
2369 | @table @asis | |
2370 | @item @var{dpy} | |
2371 | Specifies the connection to the X server. | |
2372 | ||
2373 | @item @var{drawable} | |
2374 | Specifies the drawable whose buffers are to be swapped. | |
2375 | ||
2376 | @end table | |
2377 | ||
2378 | @heading Description | |
2379 | @code{glXSwapBuffers} promotes the contents of the back buffer of | |
2380 | @var{drawable} to become the contents of the front buffer of | |
2381 | @var{drawable}. The contents of the back buffer then become undefined. | |
2382 | The update typically takes place during the vertical retrace of the | |
2383 | monitor, rather than immediately after @code{glXSwapBuffers} is called. | |
2384 | ||
2385 | @code{glXSwapBuffers} performs an implicit @code{glFlush} before it | |
2386 | returns. Subsequent OpenGL commands may be issued immediately after | |
2387 | calling @code{glXSwapBuffers}, but are not executed until the buffer | |
2388 | exchange is completed. | |
2389 | ||
2390 | If @var{drawable} was not created with respect to a double-buffered | |
2391 | visual, @code{glXSwapBuffers} has no effect, and no error is generated. | |
2392 | ||
2393 | @heading Errors | |
2394 | @code{GLXBadDrawable} is generated if @var{drawable} is not a valid GLX | |
2395 | drawable. | |
2396 | ||
2397 | @code{GLXBadCurrentWindow} is generated if @var{dpy} and @var{drawable} | |
2398 | are respectively the display and drawable associated with the current | |
2399 | context of the calling thread, and @var{drawable} identifies a window | |
2400 | that is no longer valid. | |
2401 | ||
2402 | @end defun | |
2403 | ||
2404 | @defun glXUseXFont | |
2405 | @heading create bitmap display lists from an X font | |
2406 | @heading Parameters | |
2407 | @table @asis | |
2408 | @item @var{font} | |
2409 | Specifies the font from which character glyphs are to be taken. | |
2410 | ||
2411 | @item @var{first} | |
2412 | Specifies the index of the first glyph to be taken. | |
2413 | ||
2414 | @item @var{count} | |
2415 | Specifies the number of glyphs to be taken. | |
2416 | ||
2417 | @item @var{listBase} | |
2418 | Specifies the index of the first display list to be generated. | |
2419 | ||
2420 | @end table | |
2421 | ||
2422 | @heading Description | |
2423 | @code{glXUseXFont} generates @var{count} display lists, named | |
2424 | @var{listBase} through @math{@var{listBase}+@var{count}-1}, each | |
2425 | containing a single @code{glBitmap} command. The parameters of the | |
2426 | @code{glBitmap} command of display list @math{@var{listBase}+@var{i}} | |
2427 | are derived from glyph @math{@var{first}+@var{i}}. Bitmap parameters | |
2428 | @math{@var{xorig}}, @math{@var{yorig}}, @math{@var{width}}, and | |
2429 | @math{@var{height}} are computed from font metrics as | |
2430 | @math{@var{descent}-1}, @math{-@var{lbearing}}, | |
2431 | @math{@var{rbearing}-@var{lbearing}}, and | |
2432 | @math{@var{ascent}+@var{descent}}, respectively. @math{@var{xmove}} is | |
2433 | taken from the glyph's @math{@var{width}} metric, and @math{@var{ymove}} | |
2434 | is set to zero. Finally, the glyph's image is converted to the | |
2435 | appropriate format for @code{glBitmap}. | |
2436 | ||
2437 | Using @code{glXUseXFont} may be more efficient than accessing the X font | |
2438 | and generating the display lists explicitly, both because the display | |
2439 | lists are created on the server without requiring a round trip of the | |
2440 | glyph data, and because the server may choose to delay the creation of | |
2441 | each bitmap until it is accessed. | |
2442 | ||
2443 | Empty display lists are created for all glyphs that are requested and | |
2444 | are not defined in @var{font}. @code{glXUseXFont} is ignored if there is | |
2445 | no current GLX context. | |
2446 | ||
2447 | @heading Errors | |
2448 | @code{BadFont} is generated if @var{font} is not a valid font. | |
2449 | ||
2450 | @code{GLXBadContextState} is generated if the current GLX context is in | |
2451 | display-list construction mode. | |
2452 | ||
2453 | @code{GLXBadCurrentWindow} is generated if the drawable associated with | |
2454 | the current context of the calling thread is a window, and that window | |
2455 | is no longer valid. | |
2456 | ||
2457 | @end defun | |
2458 | ||
2459 | @defun glXWaitGL | |
2460 | @heading complete GL execution prior to subsequent X calls | |
2461 | @heading Description | |
2462 | GL rendering calls made prior to @code{glXWaitGL} are guaranteed to be | |
2463 | executed before X rendering calls made after @code{glXWaitGL}. Although | |
2464 | this same result can be achieved using @code{glFinish}, @code{glXWaitGL} | |
2465 | does not require a round trip to the server, and it is therefore more | |
2466 | efficient in cases where client and server are on separate machines. | |
2467 | ||
2468 | @code{glXWaitGL} is ignored if there is no current GLX context. | |
2469 | ||
2470 | @heading Errors | |
2471 | @code{GLXBadCurrentWindow} is generated if the drawable associated with | |
2472 | the current context of the calling thread is a window, and that window | |
2473 | is no longer valid. | |
2474 | ||
2475 | @end defun | |
2476 | ||
2477 | @defun glXWaitX | |
2478 | @heading complete X execution prior to subsequent GL calls | |
2479 | @heading Description | |
2480 | X rendering calls made prior to @code{glXWaitX} are guaranteed to be | |
2481 | executed before GL rendering calls made after @code{glXWaitX}. Although | |
2482 | the same result can be achieved using @code{XSync}, @code{glXWaitX} does | |
2483 | not require a round trip to the server, and it is therefore more | |
2484 | efficient in cases where client and server are on separate machines. | |
2485 | ||
2486 | @code{glXWaitX} is ignored if there is no current GLX context. | |
2487 | ||
2488 | @heading Errors | |
2489 | @code{GLXBadCurrentWindow} is generated if the drawable associated with | |
2490 | the current context of the calling thread is a window, and that window | |
2491 | is no longer valid. | |
2492 | ||
2493 | @end defun | |
2494 | ||
2495 | ||
2496 | @c %end of fragment |