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[mesa.git] / src / glx / x11 / glxextensions.c
1 /*
2 * (C) Copyright IBM Corporation 2002, 2004
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file glxextensions.c
27 *
28 * \author Ian Romanick <idr@us.ibm.com>
29 */
30
31 #include "glxclient.h"
32 #include <X11/extensions/extutil.h>
33 #include <X11/extensions/Xext.h>
34 #include <string.h>
35 #include "glapi.h"
36 #include "glxextensions.h"
37 #include "simple_list.h"
38
39 #define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
40 #define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
41 #define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
42 #define CONCAT(a,b) a ## b
43 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
44 #define GL(n) "GL_" # n, 3 + sizeof( # n ) - 1, GL_ ## n ## _bit
45 #define VER(a,b) a, b
46 #define Y 1
47 #define N 0
48 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit ))
49
50
51 struct extension_info {
52 const char * const name;
53 unsigned name_len;
54
55 unsigned char bit;
56
57 /* This is the lowest version of GLX that "requires" this extension.
58 * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
59 * SGI_make_current_read. If the extension is not required by any known
60 * version of GLX, use 0, 0.
61 */
62 unsigned char version_major;
63 unsigned char version_minor;
64 unsigned char client_support;
65 unsigned char direct_support;
66 unsigned char client_only; /** Is the extension client-side only? */
67 unsigned char direct_only; /** Is the extension for direct
68 * contexts only?
69 */
70 };
71
72 static const struct extension_info known_glx_extensions[] = {
73 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N },
74 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N },
75 { GLX(ARB_render_texture), VER(0,0), N, N, N, N },
76 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N },
77 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N },
78 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N },
79 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N },
80 { GLX(MESA_agp_offset), VER(0,0), N, N, N, Y }, /* Deprecated */
81 { GLX(MESA_allocate_memory), VER(0,0), Y, N, N, Y },
82 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
83 { GLX(MESA_pixmap_colormap), VER(0,0), N, N, N, N }, /* Deprecated */
84 { GLX(MESA_release_buffers), VER(0,0), N, N, N, N }, /* Deprecated */
85 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
86 { GLX(MESA_swap_frame_usage), VER(0,0), Y, N, N, Y },
87 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
88 { GLX(NV_render_depth_texture), VER(0,0), N, N, N, N },
89 { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N },
90 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, Y }, /* Deprecated */
91 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
92 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
93 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
94 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
95 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
96 { GLX(SGIS_blended_overlay), VER(0,0), N, N, N, N },
97 { GLX(SGIS_color_range), VER(0,0), N, N, N, N },
98 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N },
99 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N },
100 { GLX(SGIX_pbuffer), VER(1,3), Y, N, N, N },
101 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N },
102 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N },
103 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N },
104 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N },
105 { NULL }
106 };
107
108 static const struct extension_info known_gl_extensions[] = {
109 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
110 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
111 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
112 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N },
113 { GL(ARB_imaging), VER(0,0), Y, N, N, N },
114 { GL(ARB_multisample), VER(1,3), Y, N, N, N },
115 { GL(ARB_multitexture), VER(1,3), Y, N, N, N },
116 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N },
117 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N },
118 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N },
119 { GL(ARB_shadow), VER(1,4), Y, N, N, N },
120 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N },
121 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N },
122 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N },
123 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N },
124 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N },
125 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N },
126 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N },
127 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N },
128 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N },
129 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N },
130 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N },
131 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
132 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
133 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
134 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
135 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
136 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
137 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
138 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
139 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
140 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
141 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
142 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
143 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
144 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
145 { GL(EXT_convolution), VER(0,0), N, N, N, N },
146 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
147 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
148 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
149 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
150 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
151 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
152 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
153 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
154 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
155 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
156 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
157 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
158 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
159 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
160 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
161 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
162 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
163 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
164 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
165 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
166 { GL(EXT_texture), VER(1,1), Y, N, N, N },
167 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
168 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
169 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
170 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
171 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
172 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
173 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
174 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
175 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
176 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
177 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
178 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
179 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
180 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
181 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
182 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
183 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
184 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
185 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
186 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
187 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
188 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
189 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
190 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
191 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
192 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
193 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
194 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
195 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
196 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
197 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
198 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
199 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
200 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
201 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
202 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
203 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
204 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
205 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
206 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
207 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
208 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
209 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
210 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
211 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
212 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
213 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
214 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
215 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
216 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
217 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
218 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
219 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
220 { GL(OES_read_format), VER(0,0), Y, N, N, N },
221 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
222 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
223 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
224 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
225 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
226 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
227 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
228 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
229 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
230 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
231 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
232 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
233 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
234 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
235 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
236 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
237 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
238 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
239 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
240 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
241 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
242 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
243 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
244 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
245 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
246 { NULL }
247 };
248
249
250 /* global bit-fields of available extensions and their characteristics */
251 static unsigned char client_glx_support[8];
252 static unsigned char client_glx_only[8];
253 static unsigned char direct_glx_only[8];
254 static unsigned char client_gl_support[ __GL_EXT_BYTES ];
255 static unsigned char client_gl_only[ __GL_EXT_BYTES ];
256
257 /**
258 * Bits representing the set of extensions that are enabled by default in all
259 * direct rendering drivers.
260 */
261 static unsigned char direct_glx_support[8];
262
263 /**
264 * Highest core GL version that can be supported for indirect rendering.
265 */
266 static const unsigned gl_major = 1;
267 static const unsigned gl_minor = 4;
268
269 /* client extensions string */
270 static const char * __glXGLXClientExtensions = NULL;
271
272 static void __glXExtensionsCtr( void );
273 static void __glXExtensionsCtrScreen( __GLXscreenConfigs *psc );
274 static void __glXProcessServerString( const struct extension_info * ext,
275 const char * server_string, unsigned char * server_support );
276
277 /**
278 * Set the state of a GLX extension.
279 *
280 * \param name Name of the extension.
281 * \param name_len Length, in characters, of the extension name.
282 * \param state New state (either enabled or disabled) of the extension.
283 * \param supported Table in which the state of the extension is to be set.
284 */
285 static void
286 set_glx_extension( const struct extension_info * ext,
287 const char * name, unsigned name_len, GLboolean state,
288 unsigned char * supported )
289 {
290 unsigned i;
291
292
293 for ( i = 0 ; ext[i].name != NULL ; i++ ) {
294 if ( (name_len == ext[i].name_len)
295 && (strncmp( ext[i].name, name, name_len ) == 0) ) {
296 if ( state ) {
297 SET_BIT( supported, ext[i].bit );
298 }
299 else {
300 CLR_BIT( supported, ext[i].bit );
301 }
302
303 return;
304 }
305 }
306 }
307
308
309 #define NUL '\0'
310 #define SEPARATOR ' '
311
312 /**
313 * Convert the server's extension string to a bit-field.
314 *
315 * \param server_string GLX extension string from the server.
316 * \param server_support Bit-field of supported extensions.
317 *
318 * \note
319 * This function is used to process both GLX and GL extension strings. The
320 * bit-fields used to track each of these have different sizes. Therefore,
321 * the data pointed by \c server_support must be preinitialized to zero.
322 */
323 static void
324 __glXProcessServerString( const struct extension_info * ext,
325 const char * server_string,
326 unsigned char * server_support )
327 {
328 unsigned base;
329 unsigned len;
330
331 for ( base = 0 ; server_string[ base ] != NUL ; /* empty */ ) {
332 /* Determine the length of the next extension name.
333 */
334 for ( len = 0
335 ; (server_string[ base + len ] != SEPARATOR)
336 && (server_string[ base + len ] != NUL)
337 ; len++ ) {
338 /* empty */
339 }
340
341 /* Set the bit for the extension in the server_support table.
342 */
343 set_glx_extension( ext, & server_string[ base ], len, GL_TRUE,
344 server_support );
345
346
347 /* Advance to the next extension string. This means that we skip
348 * over the previous string and any trialing white-space.
349 */
350 for ( base += len ;
351 (server_string[ base ] == SEPARATOR)
352 && (server_string[ base ] != NUL)
353 ; base++ ) {
354 /* empty */
355 }
356 }
357 }
358
359
360 /**
361 * Enable a named GLX extension on a given screen.
362 * Drivers should not call this function directly. They should instead use
363 * \c glXGetProcAddress to obtain a pointer to the function.
364 *
365 * \param psc Pointer to GLX per-screen record.
366 * \param name Name of the extension to enable.
367 *
368 * \sa glXGetProcAddress
369 *
370 * \since Internal API version 20030813.
371 */
372 void
373 __glXScrEnableExtension( __GLXscreenConfigs *psc, const char * name )
374 {
375 __glXExtensionsCtr();
376 __glXExtensionsCtrScreen(psc);
377 set_glx_extension( known_glx_extensions, name, strlen( name ), GL_TRUE,
378 psc->direct_support );
379 }
380
381
382 /**
383 * Initialize global extension support tables.
384 */
385
386 static void
387 __glXExtensionsCtr( void )
388 {
389 unsigned i;
390 static GLboolean ext_list_first_time = GL_TRUE;
391
392
393 if ( ext_list_first_time ) {
394 ext_list_first_time = GL_FALSE;
395
396 (void) memset( client_glx_support, 0, sizeof( client_glx_support ) );
397 (void) memset( direct_glx_support, 0, sizeof( direct_glx_support ) );
398 (void) memset( client_glx_only, 0, sizeof( client_glx_only ) );
399 (void) memset( direct_glx_only, 0, sizeof( direct_glx_only ) );
400
401 (void) memset( client_gl_support, 0, sizeof( client_gl_support ) );
402 (void) memset( client_gl_only, 0, sizeof( client_gl_only ) );
403
404 for ( i = 0 ; known_glx_extensions[i].name != NULL ; i++ ) {
405 const unsigned bit = known_glx_extensions[i].bit;
406
407 if ( known_glx_extensions[i].client_support ) {
408 SET_BIT( client_glx_support, bit );
409 }
410
411 if ( known_glx_extensions[i].direct_support ) {
412 SET_BIT( direct_glx_support, bit );
413 }
414
415 if ( known_glx_extensions[i].client_only ) {
416 SET_BIT( client_glx_only, bit );
417 }
418
419 if ( known_glx_extensions[i].direct_only ) {
420 SET_BIT( direct_glx_only, bit );
421 }
422 }
423
424 for ( i = 0 ; known_gl_extensions[i].name != NULL ; i++ ) {
425 const unsigned bit = known_gl_extensions[i].bit;
426
427 if ( known_gl_extensions[i].client_support ) {
428 SET_BIT( client_gl_support, bit );
429 }
430
431 if ( known_gl_extensions[i].client_only ) {
432 SET_BIT( client_gl_only, bit );
433 }
434 }
435
436 #if 0
437 fprintf( stderr, "[%s:%u] Maximum client library version: %u.%u\n",
438 __func__, __LINE__, gl_major, gl_minor );
439 #endif
440 }
441 }
442
443
444 /**
445 * Make sure that per-screen direct-support table is initialized.
446 *
447 * \param psc Pointer to GLX per-screen record.
448 */
449
450 static void
451 __glXExtensionsCtrScreen( __GLXscreenConfigs *psc )
452 {
453 if (psc->ext_list_first_time) {
454 psc->ext_list_first_time = GL_FALSE;
455 (void) memcpy( psc->direct_support, direct_glx_support,
456 sizeof( direct_glx_support ) );
457 }
458 }
459
460
461 /**
462 * Check if a certain extension is enabled on a given screen.
463 *
464 * \param psc Pointer to GLX per-screen record.
465 * \param bit Bit index in the direct-support table.
466 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
467 * returned. If the extension bit is not enabled or if \c psc is
468 * \c NULL, then \c GL_FALSE is returned.
469 */
470 GLboolean
471 __glXExtensionBitIsEnabled( __GLXscreenConfigs *psc, unsigned bit )
472 {
473 GLboolean enabled = GL_FALSE;
474
475 if ( psc != NULL ) {
476 __glXExtensionsCtr();
477 __glXExtensionsCtrScreen( psc );
478 enabled = EXT_ENABLED( bit, psc->direct_support );
479 }
480
481 return enabled;
482 }
483
484
485 /**
486 * Check if a certain extension is enabled in a given context.
487 *
488 */
489 GLboolean
490 __glExtensionBitIsEnabled( const __GLXcontext * gc, unsigned bit )
491 {
492 GLboolean enabled = GL_FALSE;
493
494 if ( gc != NULL ) {
495 enabled = EXT_ENABLED( bit, gc->gl_extension_bits );
496 }
497
498 return enabled;
499 }
500
501
502
503 /**
504 * Convert a bit-field to a string of supported extensions.
505 */
506 static char *
507 __glXGetStringFromTable( const struct extension_info * ext,
508 const unsigned char * supported )
509 {
510 unsigned i;
511 unsigned ext_str_len;
512 char * ext_str;
513 char * point;
514
515
516 ext_str_len = 0;
517 for ( i = 0 ; ext[i].name != NULL ; i++ ) {
518 if ( EXT_ENABLED( ext[i].bit, supported ) ) {
519 ext_str_len += ext[i].name_len + 1;
520 }
521 }
522
523 ext_str = Xmalloc( ext_str_len + 1 );
524 if ( ext_str != NULL ) {
525 point = ext_str;
526
527 for ( i = 0 ; ext[i].name != NULL ; i++ ) {
528 if ( EXT_ENABLED( ext[i].bit, supported ) ) {
529 (void) memcpy( point, ext[i].name, ext[i].name_len );
530 point += ext[i].name_len;
531
532 *point = ' ';
533 point++;
534 }
535 }
536
537 *point = '\0';
538 }
539
540 return ext_str;
541 }
542
543
544 /**
545 * Get the string of client library supported extensions.
546 */
547 const char *
548 __glXGetClientExtensions( void )
549 {
550 if ( __glXGLXClientExtensions == NULL ) {
551 __glXExtensionsCtr();
552 __glXGLXClientExtensions = __glXGetStringFromTable( known_glx_extensions,
553 client_glx_support );
554 }
555
556 return __glXGLXClientExtensions;
557 }
558
559
560 /**
561 * Calculate the list of application usable extensions. The resulting
562 * string is stored in \c psc->effectiveGLXexts.
563 *
564 * \param psc Pointer to GLX per-screen record.
565 * \param display_is_direct_capable True if the display is capable of
566 * direct rendering.
567 * \param minor_version GLX minor version from the server.
568 */
569
570 void
571 __glXCalculateUsableExtensions( __GLXscreenConfigs *psc,
572 GLboolean display_is_direct_capable,
573 int minor_version )
574 {
575 unsigned char server_support[8];
576 unsigned char usable[8];
577 unsigned i;
578
579 __glXExtensionsCtr();
580 __glXExtensionsCtrScreen( psc );
581
582 (void) memset( server_support, 0, sizeof( server_support ) );
583 __glXProcessServerString( known_glx_extensions,
584 psc->serverGLXexts, server_support );
585
586
587 /* This is a hack. Some servers support GLX 1.3 but don't export
588 * all of the extensions implied by GLX 1.3. If the server claims
589 * support for GLX 1.3, enable support for the extensions that can be
590 * "emulated" as well.
591 */
592
593 if ( minor_version >= 3 ) {
594 SET_BIT( server_support, EXT_visual_info_bit );
595 SET_BIT( server_support, EXT_visual_rating_bit );
596 SET_BIT( server_support, SGI_make_current_read_bit );
597 SET_BIT( server_support, SGIX_fbconfig_bit );
598 SET_BIT( server_support, SGIX_pbuffer_bit );
599
600 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
601 * extension. However, the only part that is not strictly client-side
602 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
603 * function.
604 */
605
606 SET_BIT( server_support, EXT_import_context_bit );
607 }
608
609
610 /* An extension is supported if the client-side (i.e., libGL) supports
611 * it and the "server" supports it. In this case that means that either
612 * the true server supports it or it is only for direct-rendering and
613 * the direct rendering driver supports it.
614 *
615 * If the display is not capable of direct rendering, then the extension
616 * is enabled if and only if the client-side library and the server
617 * support it.
618 */
619
620 if ( display_is_direct_capable ) {
621 for ( i = 0 ; i < 8 ; i++ ) {
622 usable[i] = (client_glx_support[i] & client_glx_only[i])
623 | (client_glx_support[i] & psc->direct_support[i] & server_support[i])
624 | (client_glx_support[i] & psc->direct_support[i] & direct_glx_only[i]);
625 }
626 }
627 else {
628 for ( i = 0 ; i < 8 ; i++ ) {
629 usable[i] = (client_glx_support[i] & client_glx_only[i])
630 | (client_glx_support[i] & server_support[i]);
631 }
632 }
633
634 psc->effectiveGLXexts = __glXGetStringFromTable( known_glx_extensions,
635 usable );
636 }
637
638
639 /**
640 * Calculate the list of application usable extensions. The resulting
641 * string is stored in \c gc->extensions.
642 *
643 * \param gc Pointer to GLX context.
644 * \param server_string Extension string from the server.
645 * \param major_version GL major version from the server.
646 * \param minor_version GL minor version from the server.
647 */
648
649 void
650 __glXCalculateUsableGLExtensions( __GLXcontext * gc,
651 const char * server_string,
652 int major_version, int minor_version )
653 {
654 unsigned char server_support[ __GL_EXT_BYTES ];
655 unsigned char usable[ __GL_EXT_BYTES ];
656 unsigned i;
657
658
659 __glXExtensionsCtr();
660
661 (void) memset( server_support, 0, sizeof( server_support ) );
662 __glXProcessServerString( known_gl_extensions, server_string,
663 server_support );
664
665
666 /* Handle lazy servers that don't export all the extensions strings that
667 * are part of the GL core version that they support.
668 */
669
670 for ( i = 0 ; i < __GL_EXT_BYTES ; i++ ) {
671 if ( (known_gl_extensions[i].version_major != 0)
672 && ((major_version > known_gl_extensions[i].version_major)
673 || ((major_version == known_gl_extensions[i].version_major)
674 && (minor_version >= known_gl_extensions[i].version_minor))) ) {
675 SET_BIT( server_support, known_gl_extensions[i].bit );
676 }
677 }
678
679
680 /* An extension is supported if the client-side (i.e., libGL) supports
681 * it and the server supports it or the client-side library supports it
682 * and it only needs client-side support.
683 */
684
685 for ( i = 0 ; i < __GL_EXT_BYTES ; i++ ) {
686 usable[i] = (client_gl_support[i] & client_gl_only[i])
687 | (client_gl_support[i] & server_support[i]);
688 }
689
690 gc->extensions = (unsigned char *)
691 __glXGetStringFromTable( known_gl_extensions, usable );
692 (void) memcpy( gc->gl_extension_bits, usable, sizeof( usable ) );
693 }
694
695
696 /**
697 * Calculates the maximum core GL version that can be supported for indirect
698 * rendering.
699 */
700 void
701 __glXGetGLVersion( int * major_version, int * minor_version )
702 {
703 __glXExtensionsCtr();
704 *major_version = gl_major;
705 *minor_version = gl_minor;
706 }
707
708
709 /**
710 * Get a string representing the set of extensions supported by the client
711 * library. This is currently only used to send the list of extensions
712 * supported by the client to the server.
713 */
714 char *
715 __glXGetClientGLExtensionString( void )
716 {
717 __glXExtensionsCtr();
718 return __glXGetStringFromTable( known_gl_extensions, client_gl_support );
719 }