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Merge remote branch 'origin/gallium-0.2' into gallium-0.2
[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 {
54 const char *const name;
55 unsigned name_len;
56
57 unsigned char bit;
58
59 /* This is the lowest version of GLX that "requires" this extension.
60 * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
61 * SGI_make_current_read. If the extension is not required by any known
62 * version of GLX, use 0, 0.
63 */
64 unsigned char version_major;
65 unsigned char version_minor;
66 unsigned char client_support;
67 unsigned char direct_support;
68 unsigned char client_only; /** Is the extension client-side only? */
69 unsigned char direct_only; /** Is the extension for direct
70 * contexts only?
71 */
72 };
73
74 /* *INDENT-OFF* */
75 static const struct extension_info known_glx_extensions[] = {
76 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N },
77 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N },
78 { GLX(ARB_render_texture), VER(0,0), N, N, N, N },
79 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N },
80 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N },
81 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N },
82 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N },
83 { GLX(MESA_agp_offset), VER(0,0), N, N, N, Y }, /* Deprecated */
84 { GLX(MESA_allocate_memory), VER(0,0), Y, N, N, Y },
85 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
86 { GLX(MESA_pixmap_colormap), VER(0,0), N, N, N, N }, /* Deprecated */
87 { GLX(MESA_release_buffers), VER(0,0), N, N, N, N }, /* Deprecated */
88 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
89 { GLX(MESA_swap_frame_usage), VER(0,0), Y, N, N, Y },
90 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
91 { GLX(NV_render_depth_texture), VER(0,0), N, N, N, N },
92 { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N },
93 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, Y }, /* Deprecated */
94 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
95 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
96 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
97 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
98 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
99 { GLX(SGIS_blended_overlay), VER(0,0), N, N, N, N },
100 { GLX(SGIS_color_range), VER(0,0), N, N, N, N },
101 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N },
102 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N },
103 { GLX(SGIX_pbuffer), VER(1,3), Y, N, N, N },
104 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N },
105 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N },
106 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N },
107 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N },
108 { NULL }
109 };
110
111 static const struct extension_info known_gl_extensions[] = {
112 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
113 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
114 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
115 { GL(ARB_fragment_program_shadow), 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_object), VER(0,0), Y, N, N, N },
155 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
156 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
157 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
158 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
159 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
160 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
161 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
162 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
163 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
164 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
165 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
166 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
167 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
168 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
169 { GL(EXT_texture), VER(1,1), Y, N, N, N },
170 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
171 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
172 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
173 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
174 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
175 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
176 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
177 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
178 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
179 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
180 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
181 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
182 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
183 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
184 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
185 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
186 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
187 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
188 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
189 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
190 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
191 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
192 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
193 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
194 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
195 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
196 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
197 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
198 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
199 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
200 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
201 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
202 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
203 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
204 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
205 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
206 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
207 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
208 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
209 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
210 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
211 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
212 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
213 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
214 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
215 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
216 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
217 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
218 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
219 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
220 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
221 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
222 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
223 { GL(OES_read_format), VER(0,0), Y, N, N, N },
224 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
225 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
226 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
227 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
228 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
229 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
230 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
231 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
232 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
233 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
234 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
235 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
236 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
237 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
238 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
239 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
240 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
241 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
242 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
243 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
244 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
245 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
246 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
247 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
248 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
249 { NULL }
250 };
251 /* *INDENT-ON* */
252
253
254 /* global bit-fields of available extensions and their characteristics */
255 static unsigned char client_glx_support[8];
256 static unsigned char client_glx_only[8];
257 static unsigned char direct_glx_only[8];
258 static unsigned char client_gl_support[__GL_EXT_BYTES];
259 static unsigned char client_gl_only[__GL_EXT_BYTES];
260
261 /**
262 * Bits representing the set of extensions that are enabled by default in all
263 * direct rendering drivers.
264 */
265 static unsigned char direct_glx_support[8];
266
267 /**
268 * Highest core GL version that can be supported for indirect rendering.
269 */
270 static const unsigned gl_major = 1;
271 static const unsigned gl_minor = 4;
272
273 /* client extensions string */
274 static const char *__glXGLXClientExtensions = NULL;
275
276 static void __glXExtensionsCtr(void);
277 static void __glXExtensionsCtrScreen(__GLXscreenConfigs * psc);
278 static void __glXProcessServerString(const struct extension_info *ext,
279 const char *server_string,
280 unsigned char *server_support);
281
282 /**
283 * Set the state of a GLX extension.
284 *
285 * \param name Name of the extension.
286 * \param name_len Length, in characters, of the extension name.
287 * \param state New state (either enabled or disabled) of the extension.
288 * \param supported Table in which the state of the extension is to be set.
289 */
290 static void
291 set_glx_extension(const struct extension_info *ext,
292 const char *name, unsigned name_len, GLboolean state,
293 unsigned char *supported)
294 {
295 unsigned i;
296
297
298 for (i = 0; ext[i].name != NULL; i++) {
299 if ((name_len == ext[i].name_len)
300 && (strncmp(ext[i].name, name, name_len) == 0)) {
301 if (state) {
302 SET_BIT(supported, ext[i].bit);
303 }
304 else {
305 CLR_BIT(supported, ext[i].bit);
306 }
307
308 return;
309 }
310 }
311 }
312
313
314 #define NUL '\0'
315 #define SEPARATOR ' '
316
317 /**
318 * Convert the server's extension string to a bit-field.
319 *
320 * \param server_string GLX extension string from the server.
321 * \param server_support Bit-field of supported extensions.
322 *
323 * \note
324 * This function is used to process both GLX and GL extension strings. The
325 * bit-fields used to track each of these have different sizes. Therefore,
326 * the data pointed by \c server_support must be preinitialized to zero.
327 */
328 static void
329 __glXProcessServerString(const struct extension_info *ext,
330 const char *server_string,
331 unsigned char *server_support)
332 {
333 unsigned base;
334 unsigned len;
335
336 for (base = 0; server_string[base] != NUL; /* empty */ ) {
337 /* Determine the length of the next extension name.
338 */
339 for (len = 0; (server_string[base + len] != SEPARATOR)
340 && (server_string[base + len] != NUL);
341 len++) {
342 /* empty */
343 }
344
345 /* Set the bit for the extension in the server_support table.
346 */
347 set_glx_extension(ext, &server_string[base], len, GL_TRUE,
348 server_support);
349
350
351 /* Advance to the next extension string. This means that we skip
352 * over the previous string and any trialing white-space.
353 */
354 for (base += len; (server_string[base] == SEPARATOR)
355 && (server_string[base] != NUL);
356 base++) {
357 /* empty */
358 }
359 }
360 }
361
362 void
363 __glXEnableDirectExtension(__GLXscreenConfigs * psc, const char *name)
364 {
365 __glXExtensionsCtr();
366 __glXExtensionsCtrScreen(psc);
367
368 set_glx_extension(known_glx_extensions,
369 name, strlen(name), GL_TRUE, psc->direct_support);
370 }
371
372 /**
373 * Initialize global extension support tables.
374 */
375
376 static void
377 __glXExtensionsCtr(void)
378 {
379 unsigned i;
380 static GLboolean ext_list_first_time = GL_TRUE;
381
382
383 if (ext_list_first_time) {
384 ext_list_first_time = GL_FALSE;
385
386 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
387 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
388 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
389 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
390
391 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
392 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
393
394 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
395 const unsigned bit = known_glx_extensions[i].bit;
396
397 if (known_glx_extensions[i].client_support) {
398 SET_BIT(client_glx_support, bit);
399 }
400
401 if (known_glx_extensions[i].direct_support) {
402 SET_BIT(direct_glx_support, bit);
403 }
404
405 if (known_glx_extensions[i].client_only) {
406 SET_BIT(client_glx_only, bit);
407 }
408
409 if (known_glx_extensions[i].direct_only) {
410 SET_BIT(direct_glx_only, bit);
411 }
412 }
413
414 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
415 const unsigned bit = known_gl_extensions[i].bit;
416
417 if (known_gl_extensions[i].client_support) {
418 SET_BIT(client_gl_support, bit);
419 }
420
421 if (known_gl_extensions[i].client_only) {
422 SET_BIT(client_gl_only, bit);
423 }
424 }
425
426 #if 0
427 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
428 __func__, __LINE__, gl_major, gl_minor);
429 #endif
430 }
431 }
432
433
434 /**
435 * Make sure that per-screen direct-support table is initialized.
436 *
437 * \param psc Pointer to GLX per-screen record.
438 */
439
440 static void
441 __glXExtensionsCtrScreen(__GLXscreenConfigs * psc)
442 {
443 if (psc->ext_list_first_time) {
444 psc->ext_list_first_time = GL_FALSE;
445 (void) memcpy(psc->direct_support, direct_glx_support,
446 sizeof(direct_glx_support));
447 }
448 }
449
450
451 /**
452 * Check if a certain extension is enabled on a given screen.
453 *
454 * \param psc Pointer to GLX per-screen record.
455 * \param bit Bit index in the direct-support table.
456 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
457 * returned. If the extension bit is not enabled or if \c psc is
458 * \c NULL, then \c GL_FALSE is returned.
459 */
460 GLboolean
461 __glXExtensionBitIsEnabled(__GLXscreenConfigs * psc, unsigned bit)
462 {
463 GLboolean enabled = GL_FALSE;
464
465 if (psc != NULL) {
466 __glXExtensionsCtr();
467 __glXExtensionsCtrScreen(psc);
468 enabled = EXT_ENABLED(bit, psc->direct_support);
469 }
470
471 return enabled;
472 }
473
474
475 /**
476 * Check if a certain extension is enabled in a given context.
477 *
478 */
479 GLboolean
480 __glExtensionBitIsEnabled(const __GLXcontext * gc, unsigned bit)
481 {
482 GLboolean enabled = GL_FALSE;
483
484 if (gc != NULL) {
485 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
486 }
487
488 return enabled;
489 }
490
491
492
493 /**
494 * Convert a bit-field to a string of supported extensions.
495 */
496 static char *
497 __glXGetStringFromTable(const struct extension_info *ext,
498 const unsigned char *supported)
499 {
500 unsigned i;
501 unsigned ext_str_len;
502 char *ext_str;
503 char *point;
504
505
506 ext_str_len = 0;
507 for (i = 0; ext[i].name != NULL; i++) {
508 if (EXT_ENABLED(ext[i].bit, supported)) {
509 ext_str_len += ext[i].name_len + 1;
510 }
511 }
512
513 ext_str = Xmalloc(ext_str_len + 1);
514 if (ext_str != NULL) {
515 point = ext_str;
516
517 for (i = 0; ext[i].name != NULL; i++) {
518 if (EXT_ENABLED(ext[i].bit, supported)) {
519 (void) memcpy(point, ext[i].name, ext[i].name_len);
520 point += ext[i].name_len;
521
522 *point = ' ';
523 point++;
524 }
525 }
526
527 *point = '\0';
528 }
529
530 return ext_str;
531 }
532
533
534 /**
535 * Get the string of client library supported extensions.
536 */
537 const char *
538 __glXGetClientExtensions(void)
539 {
540 if (__glXGLXClientExtensions == NULL) {
541 __glXExtensionsCtr();
542 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
543 client_glx_support);
544 }
545
546 return __glXGLXClientExtensions;
547 }
548
549
550 /**
551 * Calculate the list of application usable extensions. The resulting
552 * string is stored in \c psc->effectiveGLXexts.
553 *
554 * \param psc Pointer to GLX per-screen record.
555 * \param display_is_direct_capable True if the display is capable of
556 * direct rendering.
557 * \param minor_version GLX minor version from the server.
558 */
559
560 void
561 __glXCalculateUsableExtensions(__GLXscreenConfigs * psc,
562 GLboolean display_is_direct_capable,
563 int minor_version)
564 {
565 unsigned char server_support[8];
566 unsigned char usable[8];
567 unsigned i;
568
569 __glXExtensionsCtr();
570 __glXExtensionsCtrScreen(psc);
571
572 (void) memset(server_support, 0, sizeof(server_support));
573 __glXProcessServerString(known_glx_extensions,
574 psc->serverGLXexts, server_support);
575
576
577 /* This is a hack. Some servers support GLX 1.3 but don't export
578 * all of the extensions implied by GLX 1.3. If the server claims
579 * support for GLX 1.3, enable support for the extensions that can be
580 * "emulated" as well.
581 */
582
583 if (minor_version >= 3) {
584 SET_BIT(server_support, EXT_visual_info_bit);
585 SET_BIT(server_support, EXT_visual_rating_bit);
586 SET_BIT(server_support, SGI_make_current_read_bit);
587 SET_BIT(server_support, SGIX_fbconfig_bit);
588 SET_BIT(server_support, SGIX_pbuffer_bit);
589
590 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
591 * extension. However, the only part that is not strictly client-side
592 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
593 * function.
594 */
595
596 SET_BIT(server_support, EXT_import_context_bit);
597 }
598
599
600 /* An extension is supported if the client-side (i.e., libGL) supports
601 * it and the "server" supports it. In this case that means that either
602 * the true server supports it or it is only for direct-rendering and
603 * the direct rendering driver supports it.
604 *
605 * If the display is not capable of direct rendering, then the extension
606 * is enabled if and only if the client-side library and the server
607 * support it.
608 */
609
610 if (display_is_direct_capable) {
611 for (i = 0; i < 8; i++) {
612 usable[i] = (client_glx_support[i] & client_glx_only[i])
613 | (client_glx_support[i] & psc->
614 direct_support[i] & server_support[i])
615 | (client_glx_support[i] & psc->
616 direct_support[i] & direct_glx_only[i]);
617 }
618 }
619 else {
620 for (i = 0; i < 8; i++) {
621 usable[i] = (client_glx_support[i] & client_glx_only[i])
622 | (client_glx_support[i] & server_support[i]);
623 }
624 }
625
626 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
627 usable);
628 }
629
630
631 /**
632 * Calculate the list of application usable extensions. The resulting
633 * string is stored in \c gc->extensions.
634 *
635 * \param gc Pointer to GLX context.
636 * \param server_string Extension string from the server.
637 * \param major_version GL major version from the server.
638 * \param minor_version GL minor version from the server.
639 */
640
641 void
642 __glXCalculateUsableGLExtensions(__GLXcontext * gc,
643 const char *server_string,
644 int major_version, int minor_version)
645 {
646 unsigned char server_support[__GL_EXT_BYTES];
647 unsigned char usable[__GL_EXT_BYTES];
648 unsigned i;
649
650
651 __glXExtensionsCtr();
652
653 (void) memset(server_support, 0, sizeof(server_support));
654 __glXProcessServerString(known_gl_extensions, server_string,
655 server_support);
656
657
658 /* Handle lazy servers that don't export all the extensions strings that
659 * are part of the GL core version that they support.
660 */
661
662 for (i = 0; i < __GL_EXT_BYTES; i++) {
663 if ((known_gl_extensions[i].version_major != 0)
664 && ((major_version > known_gl_extensions[i].version_major)
665 || ((major_version == known_gl_extensions[i].version_major)
666 && (minor_version >=
667 known_gl_extensions[i].version_minor)))) {
668 SET_BIT(server_support, known_gl_extensions[i].bit);
669 }
670 }
671
672
673 /* An extension is supported if the client-side (i.e., libGL) supports
674 * it and the server supports it or the client-side library supports it
675 * and it only needs client-side support.
676 */
677
678 for (i = 0; i < __GL_EXT_BYTES; i++) {
679 usable[i] = (client_gl_support[i] & client_gl_only[i])
680 | (client_gl_support[i] & server_support[i]);
681 }
682
683 gc->extensions = (unsigned char *)
684 __glXGetStringFromTable(known_gl_extensions, usable);
685 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
686 }
687
688
689 /**
690 * Calculates the maximum core GL version that can be supported for indirect
691 * rendering.
692 */
693 void
694 __glXGetGLVersion(int *major_version, int *minor_version)
695 {
696 __glXExtensionsCtr();
697 *major_version = gl_major;
698 *minor_version = gl_minor;
699 }
700
701
702 /**
703 * Get a string representing the set of extensions supported by the client
704 * library. This is currently only used to send the list of extensions
705 * supported by the client to the server.
706 */
707 char *
708 __glXGetClientGLExtensionString(void)
709 {
710 __glXExtensionsCtr();
711 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
712 }