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llvmpipe: Fix rebase typo
[mesa/mesa-lb.git] / src / glx / glxextensions.c
blob56c69cbfcbab83cedeffe9e135fc86aedf03cbeb
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 "glxextensions.h"
36
37
38 #define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
39 #define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
40 #define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
41 #define CONCAT(a,b) a ## b
42 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
43 #define GL(n) "GL_" # n, 3 + sizeof( # n ) - 1, GL_ ## n ## _bit
44 #define VER(a,b) a, b
45 #define Y 1
46 #define N 0
47 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit ))
48
49
50 struct extension_info
51 {
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 /* *INDENT-OFF* */
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, Y, 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 { GLX(INTEL_swap_event), VER(1,4), Y, Y, N, N },
107 { NULL }
108 };
109
110 static const struct extension_info known_gl_extensions[] = {
111 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
112 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
113 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
114 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N },
115 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N },
116 { GL(ARB_imaging), VER(0,0), Y, N, N, N },
117 { GL(ARB_multisample), VER(1,3), Y, N, N, N },
118 { GL(ARB_multitexture), VER(1,3), Y, N, N, N },
119 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N },
120 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N },
121 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N },
122 { GL(ARB_shadow), VER(1,4), Y, N, N, N },
123 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N },
124 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N },
125 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N },
126 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N },
127 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N },
128 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N },
129 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N },
130 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N },
131 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N },
132 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N },
133 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N },
134 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
135 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
136 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
137 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
138 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
139 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
140 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
141 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
142 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
143 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
144 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
145 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
146 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
147 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
148 { GL(EXT_convolution), VER(0,0), N, N, N, N },
149 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
150 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
151 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
152 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
153 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
154 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N },
155 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N },
156 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
157 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
158 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N },
159 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
160 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
161 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
162 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
163 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
164 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
165 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
166 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
167 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
168 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
169 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
170 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
171 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
172 { GL(EXT_texture), VER(1,1), Y, N, N, N },
173 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
174 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
175 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
176 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
177 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
178 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
179 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
180 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
181 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
182 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
183 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
184 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
185 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
186 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
187 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
188 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
189 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
190 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
191 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
192 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
193 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
194 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
195 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
196 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
197 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
198 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
199 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
200 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
201 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
202 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
203 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
204 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
205 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
206 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
207 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
208 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
209 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
210 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
211 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
212 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
213 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
214 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
215 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
216 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N },
217 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
218 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
219 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
220 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
221 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
222 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
223 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
224 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
225 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
226 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
227 { GL(OES_read_format), VER(0,0), Y, N, N, N },
228 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
229 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
230 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
231 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
232 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
233 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
234 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
235 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
236 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
237 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
238 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
239 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
240 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
241 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
242 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
243 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
244 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
245 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
246 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
247 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
248 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
249 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
250 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
251 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
252 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
253 { NULL }
254 };
255 /* *INDENT-ON* */
256
257
258 /* global bit-fields of available extensions and their characteristics */
259 static unsigned char client_glx_support[8];
260 static unsigned char client_glx_only[8];
261 static unsigned char direct_glx_only[8];
262 static unsigned char client_gl_support[__GL_EXT_BYTES];
263 static unsigned char client_gl_only[__GL_EXT_BYTES];
264
265 /**
266 * Bits representing the set of extensions that are enabled by default in all
267 * direct rendering drivers.
268 */
269 static unsigned char direct_glx_support[8];
270
271 /**
272 * Highest core GL version that can be supported for indirect rendering.
273 */
274 static const unsigned gl_major = 1;
275 static const unsigned gl_minor = 4;
276
277 /* client extensions string */
278 static const char *__glXGLXClientExtensions = NULL;
279
280 static void __glXExtensionsCtr(void);
281 static void __glXExtensionsCtrScreen(__GLXscreenConfigs * psc);
282 static void __glXProcessServerString(const struct extension_info *ext,
283 const char *server_string,
284 unsigned char *server_support);
285
286 /**
287 * Set the state of a GLX extension.
288 *
289 * \param name Name of the extension.
290 * \param name_len Length, in characters, of the extension name.
291 * \param state New state (either enabled or disabled) of the extension.
292 * \param supported Table in which the state of the extension is to be set.
293 */
294 static void
295 set_glx_extension(const struct extension_info *ext,
296 const char *name, unsigned name_len, GLboolean state,
297 unsigned char *supported)
298 {
299 unsigned i;
300
301
302 for (i = 0; ext[i].name != NULL; i++) {
303 if ((name_len == ext[i].name_len)
304 && (strncmp(ext[i].name, name, name_len) == 0)) {
305 if (state) {
306 SET_BIT(supported, ext[i].bit);
307 }
308 else {
309 CLR_BIT(supported, ext[i].bit);
310 }
311
312 return;
313 }
314 }
315 }
316
317
318 #define NUL '\0'
319 #define SEPARATOR ' '
320
321 /**
322 * Convert the server's extension string to a bit-field.
323 *
324 * \param server_string GLX extension string from the server.
325 * \param server_support Bit-field of supported extensions.
326 *
327 * \note
328 * This function is used to process both GLX and GL extension strings. The
329 * bit-fields used to track each of these have different sizes. Therefore,
330 * the data pointed by \c server_support must be preinitialized to zero.
331 */
332 static void
333 __glXProcessServerString(const struct extension_info *ext,
334 const char *server_string,
335 unsigned char *server_support)
336 {
337 unsigned base;
338 unsigned len;
339
340 for (base = 0; server_string[base] != NUL; /* empty */ ) {
341 /* Determine the length of the next extension name.
342 */
343 for (len = 0; (server_string[base + len] != SEPARATOR)
344 && (server_string[base + len] != NUL); len++) {
345 /* empty */
346 }
347
348 /* Set the bit for the extension in the server_support table.
349 */
350 set_glx_extension(ext, &server_string[base], len, GL_TRUE,
351 server_support);
352
353
354 /* Advance to the next extension string. This means that we skip
355 * over the previous string and any trialing white-space.
356 */
357 for (base += len; (server_string[base] == SEPARATOR)
358 && (server_string[base] != NUL); base++) {
359 /* empty */
360 }
361 }
362 }
363
364 void
365 __glXEnableDirectExtension(__GLXscreenConfigs * psc, const char *name)
366 {
367 __glXExtensionsCtr();
368 __glXExtensionsCtrScreen(psc);
369
370 set_glx_extension(known_glx_extensions,
371 name, strlen(name), GL_TRUE, psc->direct_support);
372 }
373
374 /**
375 * Initialize global extension support tables.
376 */
377
378 static void
379 __glXExtensionsCtr(void)
380 {
381 unsigned i;
382 static GLboolean ext_list_first_time = GL_TRUE;
383
384
385 if (ext_list_first_time) {
386 ext_list_first_time = GL_FALSE;
387
388 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
389 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
390 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
391 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
392
393 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
394 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
395
396 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
397 const unsigned bit = known_glx_extensions[i].bit;
398
399 if (known_glx_extensions[i].client_support) {
400 SET_BIT(client_glx_support, bit);
401 }
402
403 if (known_glx_extensions[i].direct_support) {
404 SET_BIT(direct_glx_support, bit);
405 }
406
407 if (known_glx_extensions[i].client_only) {
408 SET_BIT(client_glx_only, bit);
409 }
410
411 if (known_glx_extensions[i].direct_only) {
412 SET_BIT(direct_glx_only, bit);
413 }
414 }
415
416 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
417 const unsigned bit = known_gl_extensions[i].bit;
418
419 if (known_gl_extensions[i].client_support) {
420 SET_BIT(client_gl_support, bit);
421 }
422
423 if (known_gl_extensions[i].client_only) {
424 SET_BIT(client_gl_only, bit);
425 }
426 }
427
428 #if 0
429 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
430 __func__, __LINE__, gl_major, gl_minor);
431 #endif
432 }
433 }
434
435
436 /**
437 * Make sure that per-screen direct-support table is initialized.
438 *
439 * \param psc Pointer to GLX per-screen record.
440 */
441
442 static void
443 __glXExtensionsCtrScreen(__GLXscreenConfigs * psc)
444 {
445 if (psc->ext_list_first_time) {
446 psc->ext_list_first_time = GL_FALSE;
447 (void) memcpy(psc->direct_support, direct_glx_support,
448 sizeof(direct_glx_support));
449 }
450 }
451
452
453 /**
454 * Check if a certain extension is enabled on a given screen.
455 *
456 * \param psc Pointer to GLX per-screen record.
457 * \param bit Bit index in the direct-support table.
458 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
459 * returned. If the extension bit is not enabled or if \c psc is
460 * \c NULL, then \c GL_FALSE is returned.
461 */
462 GLboolean
463 __glXExtensionBitIsEnabled(__GLXscreenConfigs * psc, unsigned bit)
464 {
465 GLboolean enabled = GL_FALSE;
466
467 if (psc != NULL) {
468 __glXExtensionsCtr();
469 __glXExtensionsCtrScreen(psc);
470 enabled = EXT_ENABLED(bit, psc->direct_support);
471 }
472
473 return enabled;
474 }
475
476
477 /**
478 * Check if a certain extension is enabled in a given context.
479 *
480 */
481 GLboolean
482 __glExtensionBitIsEnabled(const __GLXcontext * gc, unsigned bit)
483 {
484 GLboolean enabled = GL_FALSE;
485
486 if (gc != NULL) {
487 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
488 }
489
490 return enabled;
491 }
492
493
494
495 /**
496 * Convert a bit-field to a string of supported extensions.
497 */
498 static char *
499 __glXGetStringFromTable(const struct extension_info *ext,
500 const unsigned char *supported)
501 {
502 unsigned i;
503 unsigned ext_str_len;
504 char *ext_str;
505 char *point;
506
507
508 ext_str_len = 0;
509 for (i = 0; ext[i].name != NULL; i++) {
510 if (EXT_ENABLED(ext[i].bit, supported)) {
511 ext_str_len += ext[i].name_len + 1;
512 }
513 }
514
515 ext_str = Xmalloc(ext_str_len + 1);
516 if (ext_str != NULL) {
517 point = ext_str;
518
519 for (i = 0; ext[i].name != NULL; i++) {
520 if (EXT_ENABLED(ext[i].bit, supported)) {
521 (void) memcpy(point, ext[i].name, ext[i].name_len);
522 point += ext[i].name_len;
523
524 *point = ' ';
525 point++;
526 }
527 }
528
529 *point = '\0';
530 }
531
532 return ext_str;
533 }
534
535
536 /**
537 * Get the string of client library supported extensions.
538 */
539 const char *
540 __glXGetClientExtensions(void)
541 {
542 if (__glXGLXClientExtensions == NULL) {
543 __glXExtensionsCtr();
544 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
545 client_glx_support);
546 }
547
548 return __glXGLXClientExtensions;
549 }
550
551
552 /**
553 * Calculate the list of application usable extensions. The resulting
554 * string is stored in \c psc->effectiveGLXexts.
555 *
556 * \param psc Pointer to GLX per-screen record.
557 * \param display_is_direct_capable True if the display is capable of
558 * direct rendering.
559 * \param minor_version GLX minor version from the server.
560 */
561
562 void
563 __glXCalculateUsableExtensions(__GLXscreenConfigs * psc,
564 GLboolean display_is_direct_capable,
565 int minor_version)
566 {
567 unsigned char server_support[8];
568 unsigned char usable[8];
569 unsigned i;
570
571 __glXExtensionsCtr();
572 __glXExtensionsCtrScreen(psc);
573
574 (void) memset(server_support, 0, sizeof(server_support));
575 __glXProcessServerString(known_glx_extensions,
576 psc->serverGLXexts, server_support);
577
578
579 /* This is a hack. Some servers support GLX 1.3 but don't export
580 * all of the extensions implied by GLX 1.3. If the server claims
581 * support for GLX 1.3, enable support for the extensions that can be
582 * "emulated" as well.
583 */
584
585 if (minor_version >= 3) {
586 SET_BIT(server_support, EXT_visual_info_bit);
587 SET_BIT(server_support, EXT_visual_rating_bit);
588 SET_BIT(server_support, SGI_make_current_read_bit);
589 SET_BIT(server_support, SGIX_fbconfig_bit);
590 SET_BIT(server_support, SGIX_pbuffer_bit);
591
592 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
593 * extension. However, the only part that is not strictly client-side
594 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
595 * function.
596 */
597
598 SET_BIT(server_support, EXT_import_context_bit);
599 }
600
601
602 /* An extension is supported if the client-side (i.e., libGL) supports
603 * it and the "server" supports it. In this case that means that either
604 * the true server supports it or it is only for direct-rendering and
605 * the direct rendering driver supports it.
606 *
607 * If the display is not capable of direct rendering, then the extension
608 * is enabled if and only if the client-side library and the server
609 * support it.
610 */
611
612 if (display_is_direct_capable) {
613 for (i = 0; i < 8; i++) {
614 usable[i] = (client_glx_support[i] & client_glx_only[i])
615 | (client_glx_support[i] & psc->direct_support[i] &
616 server_support[i])
617 | (client_glx_support[i] & psc->direct_support[i] &
618 direct_glx_only[i]);
619 }
620 }
621 else {
622 for (i = 0; i < 8; i++) {
623 usable[i] = (client_glx_support[i] & client_glx_only[i])
624 | (client_glx_support[i] & server_support[i]);
625 }
626 }
627
628 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
629 usable);
630 }
631
632
633 /**
634 * Calculate the list of application usable extensions. The resulting
635 * string is stored in \c gc->extensions.
636 *
637 * \param gc Pointer to GLX context.
638 * \param server_string Extension string from the server.
639 * \param major_version GL major version from the server.
640 * \param minor_version GL minor version from the server.
641 */
642
643 void
644 __glXCalculateUsableGLExtensions(__GLXcontext * gc,
645 const char *server_string,
646 int major_version, int minor_version)
647 {
648 unsigned char server_support[__GL_EXT_BYTES];
649 unsigned char usable[__GL_EXT_BYTES];
650 unsigned i;
651
652
653 __glXExtensionsCtr();
654
655 (void) memset(server_support, 0, sizeof(server_support));
656 __glXProcessServerString(known_gl_extensions, server_string,
657 server_support);
658
659
660 /* Handle lazy servers that don't export all the extensions strings that
661 * are part of the GL core version that they support.
662 */
663
664 for (i = 0; i < __GL_EXT_BYTES; i++) {
665 if ((known_gl_extensions[i].version_major != 0)
666 && ((major_version > known_gl_extensions[i].version_major)
667 || ((major_version == known_gl_extensions[i].version_major)
668 && (minor_version >=
669 known_gl_extensions[i].version_minor)))) {
670 SET_BIT(server_support, known_gl_extensions[i].bit);
671 }
672 }
673
674
675 /* An extension is supported if the client-side (i.e., libGL) supports
676 * it and the server supports it or the client-side library supports it
677 * and it only needs client-side support.
678 */
679
680 for (i = 0; i < __GL_EXT_BYTES; i++) {
681 usable[i] = (client_gl_support[i] & client_gl_only[i])
682 | (client_gl_support[i] & server_support[i]);
683 }
684
685 gc->extensions = (unsigned char *)
686 __glXGetStringFromTable(known_gl_extensions, usable);
687 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
688 }
689
690
691 /**
692 * Calculates the maximum core GL version that can be supported for indirect
693 * rendering.
694 */
695 void
696 __glXGetGLVersion(int *major_version, int *minor_version)
697 {
698 __glXExtensionsCtr();
699 *major_version = gl_major;
700 *minor_version = gl_minor;
701 }
702
703
704 /**
705 * Get a string representing the set of extensions supported by the client
706 * library. This is currently only used to send the list of extensions
707 * supported by the client to the server.
708 */
709 char *
710 __glXGetClientGLExtensionString(void)
711 {
712 __glXExtensionsCtr();
713 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
714 }
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