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