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[mesa.git] / src / glx / 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 "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_create_context), VER(0,0), Y, N, N, N },
75 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N },
76 { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N },
77 { GLX(ARB_fbconfig_float), VER(0,0), Y, Y, N, N },
78 { GLX(ARB_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
79 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N },
80 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N },
81 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N },
82 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N },
83 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N },
84 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N },
85 { GLX(EXT_fbconfig_packed_float), VER(0,0), Y, Y, N, N },
86 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
87 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, N },
88 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
89 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
90 { GLX(MESA_query_renderer), VER(0,0), Y, N, N, Y },
91 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
92 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
93 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
94 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
95 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
96 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
97 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
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, Y, 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 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N },
106 { GLX(EXT_buffer_age), VER(0,0), Y, N, N, Y },
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_texture_rg), VER(0,0), Y, N, N, N },
135 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
136 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
137 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
138 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
139 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
140 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
141 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
142 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
143 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
144 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
145 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
146 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
147 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
148 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
149 { GL(EXT_convolution), VER(0,0), N, N, N, N },
150 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
151 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
152 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
153 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
154 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
155 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N },
156 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N },
157 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
158 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N },
159 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
160 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N },
161 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
162 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
163 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
164 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
165 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
166 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
167 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
168 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
169 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
170 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
171 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
172 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
173 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
174 { GL(EXT_texture), VER(1,1), Y, N, N, N },
175 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
176 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
177 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
178 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
179 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
180 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
181 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
182 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
183 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
184 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
185 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
186 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
187 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
188 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
189 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
190 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
191 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
192 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
193 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
194 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
195 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
196 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
197 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
198 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
199 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
200 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
201 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
202 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
203 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
204 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
205 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
206 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
207 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
208 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
209 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
210 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
211 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
212 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
213 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
214 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
215 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
216 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
217 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
218 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N },
219 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
220 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
221 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
222 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
223 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
224 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
225 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
226 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
227 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
228 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
229 { GL(OES_read_format), VER(0,0), Y, N, N, N },
230 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
231 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
232 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
233 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
234 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
235 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
236 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
237 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
238 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
239 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
240 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
241 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
242 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
243 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
244 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
245 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
246 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
247 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
248 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
249 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
250 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
251 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
252 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
253 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
254 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
255 { NULL }
256 };
257 /* *INDENT-ON* */
258
259
260 /* global bit-fields of available extensions and their characteristics */
261 static unsigned char client_glx_support[8];
262 static unsigned char client_glx_only[8];
263 static unsigned char direct_glx_only[8];
264 static unsigned char client_gl_support[__GL_EXT_BYTES];
265 static unsigned char client_gl_only[__GL_EXT_BYTES];
266
267 /**
268 * Bits representing the set of extensions that are enabled by default in all
269 * direct rendering drivers.
270 */
271 static unsigned char direct_glx_support[8];
272
273 /**
274 * Highest core GL version that can be supported for indirect rendering.
275 */
276 static const unsigned gl_major = 1;
277 static const unsigned gl_minor = 4;
278
279 /* client extensions string */
280 static const char *__glXGLXClientExtensions = NULL;
281
282 static void __glXExtensionsCtr(void);
283 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
284 static void __glXProcessServerString(const struct extension_info *ext,
285 const char *server_string,
286 unsigned char *server_support);
287
288 /**
289 * Set the state of a GLX extension.
290 *
291 * \param name Name of the extension.
292 * \param name_len Length, in characters, of the extension name.
293 * \param state New state (either enabled or disabled) of the extension.
294 * \param supported Table in which the state of the extension is to be set.
295 */
296 static void
297 set_glx_extension(const struct extension_info *ext,
298 const char *name, unsigned name_len, GLboolean state,
299 unsigned char *supported)
300 {
301 unsigned i;
302
303
304 for (i = 0; ext[i].name != NULL; i++) {
305 if ((name_len == ext[i].name_len)
306 && (strncmp(ext[i].name, name, name_len) == 0)) {
307 if (state) {
308 SET_BIT(supported, ext[i].bit);
309 }
310 else {
311 CLR_BIT(supported, ext[i].bit);
312 }
313
314 return;
315 }
316 }
317 }
318
319
320 #define NUL '\0'
321 #define SEPARATOR ' '
322
323 /**
324 * Convert the server's extension string to a bit-field.
325 *
326 * \param server_string GLX extension string from the server.
327 * \param server_support Bit-field of supported extensions.
328 *
329 * \note
330 * This function is used to process both GLX and GL extension strings. The
331 * bit-fields used to track each of these have different sizes. Therefore,
332 * the data pointed by \c server_support must be preinitialized to zero.
333 */
334 static void
335 __glXProcessServerString(const struct extension_info *ext,
336 const char *server_string,
337 unsigned char *server_support)
338 {
339 unsigned base;
340 unsigned len;
341
342 for (base = 0; server_string[base] != NUL; /* empty */ ) {
343 /* Determine the length of the next extension name.
344 */
345 for (len = 0; (server_string[base + len] != SEPARATOR)
346 && (server_string[base + len] != NUL); len++) {
347 /* empty */
348 }
349
350 /* Set the bit for the extension in the server_support table.
351 */
352 set_glx_extension(ext, &server_string[base], len, GL_TRUE,
353 server_support);
354
355
356 /* Advance to the next extension string. This means that we skip
357 * over the previous string and any trialing white-space.
358 */
359 for (base += len; (server_string[base] == SEPARATOR)
360 && (server_string[base] != NUL); base++) {
361 /* empty */
362 }
363 }
364 }
365
366 void
367 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
368 {
369 __glXExtensionsCtr();
370 __glXExtensionsCtrScreen(psc);
371
372 set_glx_extension(known_glx_extensions,
373 name, strlen(name), GL_TRUE, psc->direct_support);
374 }
375
376 /**
377 * Initialize global extension support tables.
378 */
379
380 static void
381 __glXExtensionsCtr(void)
382 {
383 unsigned i;
384 static GLboolean ext_list_first_time = GL_TRUE;
385
386
387 if (ext_list_first_time) {
388 ext_list_first_time = GL_FALSE;
389
390 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
391 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
392 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
393 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
394
395 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
396 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
397
398 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
399 const unsigned bit = known_glx_extensions[i].bit;
400
401 if (known_glx_extensions[i].client_support) {
402 SET_BIT(client_glx_support, bit);
403 }
404
405 if (known_glx_extensions[i].direct_support) {
406 SET_BIT(direct_glx_support, bit);
407 }
408
409 if (known_glx_extensions[i].client_only) {
410 SET_BIT(client_glx_only, bit);
411 }
412
413 if (known_glx_extensions[i].direct_only) {
414 SET_BIT(direct_glx_only, bit);
415 }
416 }
417
418 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
419 const unsigned bit = known_gl_extensions[i].bit;
420
421 if (known_gl_extensions[i].client_support) {
422 SET_BIT(client_gl_support, bit);
423 }
424
425 if (known_gl_extensions[i].client_only) {
426 SET_BIT(client_gl_only, bit);
427 }
428 }
429
430 #if 0
431 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
432 __func__, __LINE__, gl_major, gl_minor);
433 #endif
434 }
435 }
436
437
438 /**
439 * Make sure that per-screen direct-support table is initialized.
440 *
441 * \param psc Pointer to GLX per-screen record.
442 */
443
444 static void
445 __glXExtensionsCtrScreen(struct glx_screen * psc)
446 {
447 if (psc->ext_list_first_time) {
448 psc->ext_list_first_time = GL_FALSE;
449 (void) memcpy(psc->direct_support, direct_glx_support,
450 sizeof(direct_glx_support));
451 }
452 }
453
454
455 /**
456 * Check if a certain extension is enabled on a given screen.
457 *
458 * \param psc Pointer to GLX per-screen record.
459 * \param bit Bit index in the direct-support table.
460 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
461 * returned. If the extension bit is not enabled or if \c psc is
462 * \c NULL, then \c GL_FALSE is returned.
463 */
464 GLboolean
465 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
466 {
467 GLboolean enabled = GL_FALSE;
468
469 if (psc != NULL) {
470 __glXExtensionsCtr();
471 __glXExtensionsCtrScreen(psc);
472 enabled = EXT_ENABLED(bit, psc->direct_support);
473 }
474
475 return enabled;
476 }
477
478
479 /**
480 * Check if a certain extension is enabled in a given context.
481 *
482 */
483 GLboolean
484 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
485 {
486 GLboolean enabled = GL_FALSE;
487
488 if (gc != NULL) {
489 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
490 }
491
492 return enabled;
493 }
494
495
496
497 /**
498 * Convert a bit-field to a string of supported extensions.
499 */
500 static char *
501 __glXGetStringFromTable(const struct extension_info *ext,
502 const unsigned char *supported)
503 {
504 unsigned i;
505 unsigned ext_str_len;
506 char *ext_str;
507 char *point;
508
509
510 ext_str_len = 0;
511 for (i = 0; ext[i].name != NULL; i++) {
512 if (EXT_ENABLED(ext[i].bit, supported)) {
513 ext_str_len += ext[i].name_len + 1;
514 }
515 }
516
517 ext_str = malloc(ext_str_len + 1);
518 if (ext_str != NULL) {
519 point = ext_str;
520
521 for (i = 0; ext[i].name != NULL; i++) {
522 if (EXT_ENABLED(ext[i].bit, supported)) {
523 (void) memcpy(point, ext[i].name, ext[i].name_len);
524 point += ext[i].name_len;
525
526 *point = ' ';
527 point++;
528 }
529 }
530
531 *point = '\0';
532 }
533
534 return ext_str;
535 }
536
537
538 /**
539 * Get the string of client library supported extensions.
540 */
541 const char *
542 __glXGetClientExtensions(void)
543 {
544 if (__glXGLXClientExtensions == NULL) {
545 __glXExtensionsCtr();
546 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
547 client_glx_support);
548 }
549
550 return __glXGLXClientExtensions;
551 }
552
553
554 /**
555 * Calculate the list of application usable extensions. The resulting
556 * string is stored in \c psc->effectiveGLXexts.
557 *
558 * \param psc Pointer to GLX per-screen record.
559 * \param display_is_direct_capable True if the display is capable of
560 * direct rendering.
561 * \param minor_version GLX minor version from the server.
562 */
563
564 void
565 __glXCalculateUsableExtensions(struct glx_screen * psc,
566 GLboolean display_is_direct_capable,
567 int minor_version)
568 {
569 unsigned char server_support[8];
570 unsigned char usable[8];
571 unsigned i;
572
573 __glXExtensionsCtr();
574 __glXExtensionsCtrScreen(psc);
575
576 (void) memset(server_support, 0, sizeof(server_support));
577 __glXProcessServerString(known_glx_extensions,
578 psc->serverGLXexts, server_support);
579
580
581 /* This is a hack. Some servers support GLX 1.3 but don't export
582 * all of the extensions implied by GLX 1.3. If the server claims
583 * support for GLX 1.3, enable support for the extensions that can be
584 * "emulated" as well.
585 */
586 #ifndef GLX_USE_APPLEGL
587 if (minor_version >= 3) {
588 SET_BIT(server_support, EXT_visual_info_bit);
589 SET_BIT(server_support, EXT_visual_rating_bit);
590 SET_BIT(server_support, SGI_make_current_read_bit);
591 SET_BIT(server_support, SGIX_fbconfig_bit);
592 SET_BIT(server_support, SGIX_pbuffer_bit);
593
594 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
595 * extension. However, the only part that is not strictly client-side
596 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
597 * function.
598 */
599
600 SET_BIT(server_support, EXT_import_context_bit);
601 }
602 #endif
603
604 /* An extension is supported if the client-side (i.e., libGL) supports
605 * it and the "server" supports it. In this case that means that either
606 * the true server supports it or it is only for direct-rendering and
607 * the direct rendering driver supports it.
608 *
609 * If the display is not capable of direct rendering, then the extension
610 * is enabled if and only if the client-side library and the server
611 * support it.
612 */
613
614 if (display_is_direct_capable) {
615 for (i = 0; i < 8; i++) {
616 usable[i] = (client_glx_support[i] & client_glx_only[i])
617 | (client_glx_support[i] & psc->direct_support[i] &
618 server_support[i])
619 | (client_glx_support[i] & psc->direct_support[i] &
620 direct_glx_only[i]);
621 }
622 }
623 else {
624 for (i = 0; i < 8; i++) {
625 usable[i] = (client_glx_support[i] & client_glx_only[i])
626 | (client_glx_support[i] & server_support[i]);
627 }
628 }
629
630 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
631 usable);
632 }
633
634
635 /**
636 * Calculate the list of application usable extensions. The resulting
637 * string is stored in \c gc->extensions.
638 *
639 * \param gc Pointer to GLX context.
640 * \param server_string Extension string from the server.
641 * \param major_version GL major version from the server.
642 * \param minor_version GL minor version from the server.
643 */
644
645 void
646 __glXCalculateUsableGLExtensions(struct glx_context * gc,
647 const char *server_string,
648 int major_version, int minor_version)
649 {
650 unsigned char server_support[__GL_EXT_BYTES];
651 unsigned char usable[__GL_EXT_BYTES];
652 unsigned i;
653
654
655 __glXExtensionsCtr();
656
657 (void) memset(server_support, 0, sizeof(server_support));
658 __glXProcessServerString(known_gl_extensions, server_string,
659 server_support);
660
661
662 /* Handle lazy servers that don't export all the extensions strings that
663 * are part of the GL core version that they support.
664 */
665
666 for (i = 0; i < __GL_EXT_BYTES; i++) {
667 if ((known_gl_extensions[i].version_major != 0)
668 && ((major_version > known_gl_extensions[i].version_major)
669 || ((major_version == known_gl_extensions[i].version_major)
670 && (minor_version >=
671 known_gl_extensions[i].version_minor)))) {
672 SET_BIT(server_support, known_gl_extensions[i].bit);
673 }
674 }
675
676
677 /* An extension is supported if the client-side (i.e., libGL) supports
678 * it and the server supports it or the client-side library supports it
679 * and it only needs client-side support.
680 */
681
682 for (i = 0; i < __GL_EXT_BYTES; i++) {
683 usable[i] = (client_gl_support[i] & client_gl_only[i])
684 | (client_gl_support[i] & server_support[i]);
685 }
686
687 gc->extensions = (unsigned char *)
688 __glXGetStringFromTable(known_gl_extensions, usable);
689 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
690 }
691
692
693 /**
694 * Calculates the maximum core GL version that can be supported for indirect
695 * rendering.
696 */
697 void
698 __glXGetGLVersion(int *major_version, int *minor_version)
699 {
700 __glXExtensionsCtr();
701 *major_version = gl_major;
702 *minor_version = gl_minor;
703 }
704
705
706 /**
707 * Get a string representing the set of extensions supported by the client
708 * library. This is currently only used to send the list of extensions
709 * supported by the client to the server.
710 */
711 char *
712 __glXGetClientGLExtensionString(void)
713 {
714 __glXExtensionsCtr();
715 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
716 }