projects / mesa.git / blob
? search:


eb0890e23f15b54ce8be2d159be2b0b568447b4c
[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_get_proc_address), VER(1,4), Y, N, Y, N },
78 { GLX(ARB_multisample), VER(1,4), Y, Y, 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(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
84 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y },
85 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
86 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
87 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
88 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
89 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
90 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
91 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
92 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
93 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
94 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N },
95 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N },
96 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N },
97 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N },
98 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N },
99 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N },
100 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N },
101 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N },
102 { NULL }
103 };
104
105 static const struct extension_info known_gl_extensions[] = {
106 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
107 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
108 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
109 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N },
110 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N },
111 { GL(ARB_imaging), VER(0,0), Y, N, N, N },
112 { GL(ARB_multisample), VER(1,3), Y, N, N, N },
113 { GL(ARB_multitexture), VER(1,3), Y, N, N, N },
114 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N },
115 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N },
116 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N },
117 { GL(ARB_shadow), VER(1,4), Y, N, N, N },
118 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N },
119 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N },
120 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N },
121 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N },
122 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N },
123 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N },
124 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N },
125 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N },
126 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N },
127 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N },
128 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N },
129 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N },
130 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
131 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
132 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
133 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
134 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
135 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
136 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
137 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
138 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
139 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
140 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
141 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
142 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
143 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
144 { GL(EXT_convolution), VER(0,0), N, N, N, N },
145 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
146 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
147 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
148 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
149 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
150 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N },
151 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N },
152 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
153 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N },
154 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
155 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, 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_packed_depth_stencil), VER(0,0), Y, N, N, N },
214 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
215 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
216 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
217 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
218 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
219 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
220 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
221 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
222 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
223 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
224 { GL(OES_read_format), VER(0,0), Y, N, N, N },
225 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
226 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
227 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
228 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
229 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
230 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
231 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
232 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
233 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
234 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
235 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
236 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
237 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
238 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
239 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
240 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
241 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
242 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
243 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
244 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
245 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
246 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
247 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
248 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
249 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
250 { NULL }
251 };
252 /* *INDENT-ON* */
253
254
255 /* global bit-fields of available extensions and their characteristics */
256 static unsigned char client_glx_support[8];
257 static unsigned char client_glx_only[8];
258 static unsigned char direct_glx_only[8];
259 static unsigned char client_gl_support[__GL_EXT_BYTES];
260 static unsigned char client_gl_only[__GL_EXT_BYTES];
261
262 /**
263 * Bits representing the set of extensions that are enabled by default in all
264 * direct rendering drivers.
265 */
266 static unsigned char direct_glx_support[8];
267
268 /**
269 * Highest core GL version that can be supported for indirect rendering.
270 */
271 static const unsigned gl_major = 1;
272 static const unsigned gl_minor = 4;
273
274 /* client extensions string */
275 static const char *__glXGLXClientExtensions = NULL;
276
277 static void __glXExtensionsCtr(void);
278 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
279 static void __glXProcessServerString(const struct extension_info *ext,
280 const char *server_string,
281 unsigned char *server_support);
282
283 /**
284 * Set the state of a GLX extension.
285 *
286 * \param name Name of the extension.
287 * \param name_len Length, in characters, of the extension name.
288 * \param state New state (either enabled or disabled) of the extension.
289 * \param supported Table in which the state of the extension is to be set.
290 */
291 static void
292 set_glx_extension(const struct extension_info *ext,
293 const char *name, unsigned name_len, GLboolean state,
294 unsigned char *supported)
295 {
296 unsigned i;
297
298
299 for (i = 0; ext[i].name != NULL; i++) {
300 if ((name_len == ext[i].name_len)
301 && (strncmp(ext[i].name, name, name_len) == 0)) {
302 if (state) {
303 SET_BIT(supported, ext[i].bit);
304 }
305 else {
306 CLR_BIT(supported, ext[i].bit);
307 }
308
309 return;
310 }
311 }
312 }
313
314
315 #define NUL '\0'
316 #define SEPARATOR ' '
317
318 /**
319 * Convert the server's extension string to a bit-field.
320 *
321 * \param server_string GLX extension string from the server.
322 * \param server_support Bit-field of supported extensions.
323 *
324 * \note
325 * This function is used to process both GLX and GL extension strings. The
326 * bit-fields used to track each of these have different sizes. Therefore,
327 * the data pointed by \c server_support must be preinitialized to zero.
328 */
329 static void
330 __glXProcessServerString(const struct extension_info *ext,
331 const char *server_string,
332 unsigned char *server_support)
333 {
334 unsigned base;
335 unsigned len;
336
337 for (base = 0; server_string[base] != NUL; /* empty */ ) {
338 /* Determine the length of the next extension name.
339 */
340 for (len = 0; (server_string[base + len] != SEPARATOR)
341 && (server_string[base + len] != NUL); 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); base++) {
356 /* empty */
357 }
358 }
359 }
360
361 void
362 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
363 {
364 __glXExtensionsCtr();
365 __glXExtensionsCtrScreen(psc);
366
367 set_glx_extension(known_glx_extensions,
368 name, strlen(name), GL_TRUE, psc->direct_support);
369 }
370
371 /**
372 * Initialize global extension support tables.
373 */
374
375 static void
376 __glXExtensionsCtr(void)
377 {
378 unsigned i;
379 static GLboolean ext_list_first_time = GL_TRUE;
380
381
382 if (ext_list_first_time) {
383 ext_list_first_time = GL_FALSE;
384
385 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
386 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
387 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
388 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
389
390 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
391 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
392
393 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
394 const unsigned bit = known_glx_extensions[i].bit;
395
396 if (known_glx_extensions[i].client_support) {
397 SET_BIT(client_glx_support, bit);
398 }
399
400 if (known_glx_extensions[i].direct_support) {
401 SET_BIT(direct_glx_support, bit);
402 }
403
404 if (known_glx_extensions[i].client_only) {
405 SET_BIT(client_glx_only, bit);
406 }
407
408 if (known_glx_extensions[i].direct_only) {
409 SET_BIT(direct_glx_only, bit);
410 }
411 }
412
413 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
414 const unsigned bit = known_gl_extensions[i].bit;
415
416 if (known_gl_extensions[i].client_support) {
417 SET_BIT(client_gl_support, bit);
418 }
419
420 if (known_gl_extensions[i].client_only) {
421 SET_BIT(client_gl_only, bit);
422 }
423 }
424
425 #if 0
426 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
427 __func__, __LINE__, gl_major, gl_minor);
428 #endif
429 }
430 }
431
432
433 /**
434 * Make sure that per-screen direct-support table is initialized.
435 *
436 * \param psc Pointer to GLX per-screen record.
437 */
438
439 static void
440 __glXExtensionsCtrScreen(struct glx_screen * psc)
441 {
442 if (psc->ext_list_first_time) {
443 psc->ext_list_first_time = GL_FALSE;
444 (void) memcpy(psc->direct_support, direct_glx_support,
445 sizeof(direct_glx_support));
446 }
447 }
448
449
450 /**
451 * Check if a certain extension is enabled on a given screen.
452 *
453 * \param psc Pointer to GLX per-screen record.
454 * \param bit Bit index in the direct-support table.
455 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
456 * returned. If the extension bit is not enabled or if \c psc is
457 * \c NULL, then \c GL_FALSE is returned.
458 */
459 GLboolean
460 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
461 {
462 GLboolean enabled = GL_FALSE;
463
464 if (psc != NULL) {
465 __glXExtensionsCtr();
466 __glXExtensionsCtrScreen(psc);
467 enabled = EXT_ENABLED(bit, psc->direct_support);
468 }
469
470 return enabled;
471 }
472
473
474 /**
475 * Check if a certain extension is enabled in a given context.
476 *
477 */
478 GLboolean
479 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
480 {
481 GLboolean enabled = GL_FALSE;
482
483 if (gc != NULL) {
484 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
485 }
486
487 return enabled;
488 }
489
490
491
492 /**
493 * Convert a bit-field to a string of supported extensions.
494 */
495 static char *
496 __glXGetStringFromTable(const struct extension_info *ext,
497 const unsigned char *supported)
498 {
499 unsigned i;
500 unsigned ext_str_len;
501 char *ext_str;
502 char *point;
503
504
505 ext_str_len = 0;
506 for (i = 0; ext[i].name != NULL; i++) {
507 if (EXT_ENABLED(ext[i].bit, supported)) {
508 ext_str_len += ext[i].name_len + 1;
509 }
510 }
511
512 ext_str = Xmalloc(ext_str_len + 1);
513 if (ext_str != NULL) {
514 point = ext_str;
515
516 for (i = 0; ext[i].name != NULL; i++) {
517 if (EXT_ENABLED(ext[i].bit, supported)) {
518 (void) memcpy(point, ext[i].name, ext[i].name_len);
519 point += ext[i].name_len;
520
521 *point = ' ';
522 point++;
523 }
524 }
525
526 *point = '\0';
527 }
528
529 return ext_str;
530 }
531
532
533 /**
534 * Get the string of client library supported extensions.
535 */
536 const char *
537 __glXGetClientExtensions(void)
538 {
539 if (__glXGLXClientExtensions == NULL) {
540 __glXExtensionsCtr();
541 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
542 client_glx_support);
543 }
544
545 return __glXGLXClientExtensions;
546 }
547
548
549 /**
550 * Calculate the list of application usable extensions. The resulting
551 * string is stored in \c psc->effectiveGLXexts.
552 *
553 * \param psc Pointer to GLX per-screen record.
554 * \param display_is_direct_capable True if the display is capable of
555 * direct rendering.
556 * \param minor_version GLX minor version from the server.
557 */
558
559 void
560 __glXCalculateUsableExtensions(struct glx_screen * psc,
561 GLboolean display_is_direct_capable,
562 int minor_version)
563 {
564 unsigned char server_support[8];
565 unsigned char usable[8];
566 unsigned i;
567
568 __glXExtensionsCtr();
569 __glXExtensionsCtrScreen(psc);
570
571 (void) memset(server_support, 0, sizeof(server_support));
572 __glXProcessServerString(known_glx_extensions,
573 psc->serverGLXexts, server_support);
574
575
576 /* This is a hack. Some servers support GLX 1.3 but don't export
577 * all of the extensions implied by GLX 1.3. If the server claims
578 * support for GLX 1.3, enable support for the extensions that can be
579 * "emulated" as well.
580 */
581 #ifndef GLX_USE_APPLEGL
582 if (minor_version >= 3) {
583 SET_BIT(server_support, EXT_visual_info_bit);
584 SET_BIT(server_support, EXT_visual_rating_bit);
585 SET_BIT(server_support, SGI_make_current_read_bit);
586 SET_BIT(server_support, SGIX_fbconfig_bit);
587 SET_BIT(server_support, SGIX_pbuffer_bit);
588
589 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
590 * extension. However, the only part that is not strictly client-side
591 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
592 * function.
593 */
594
595 SET_BIT(server_support, EXT_import_context_bit);
596 }
597 #endif
598
599 /* An extension is supported if the client-side (i.e., libGL) supports
600 * it and the "server" supports it. In this case that means that either
601 * the true server supports it or it is only for direct-rendering and
602 * the direct rendering driver supports it.
603 *
604 * If the display is not capable of direct rendering, then the extension
605 * is enabled if and only if the client-side library and the server
606 * support it.
607 */
608
609 if (display_is_direct_capable) {
610 for (i = 0; i < 8; i++) {
611 usable[i] = (client_glx_support[i] & client_glx_only[i])
612 | (client_glx_support[i] & psc->direct_support[i] &
613 server_support[i])
614 | (client_glx_support[i] & psc->direct_support[i] &
615 direct_glx_only[i]);
616 }
617 }
618 else {
619 for (i = 0; i < 8; i++) {
620 usable[i] = (client_glx_support[i] & client_glx_only[i])
621 | (client_glx_support[i] & server_support[i]);
622 }
623 }
624
625 /* This hack is necessary because GLX_ARB_create_context_profile depends on
626 * server support, but GLX_EXT_create_context_es2_profile is direct-only.
627 * Without this hack, it would be possible to advertise
628 * GLX_EXT_create_context_es2_profile without
629 * GLX_ARB_create_context_profile. That would be a problem.
630 */
631 if (!IS_SET(server_support, ARB_create_context_profile_bit)) {
632 CLR_BIT(usable, EXT_create_context_es2_profile_bit);
633 }
634
635 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
636 usable);
637 }
638
639
640 /**
641 * Calculate the list of application usable extensions. The resulting
642 * string is stored in \c gc->extensions.
643 *
644 * \param gc Pointer to GLX context.
645 * \param server_string Extension string from the server.
646 * \param major_version GL major version from the server.
647 * \param minor_version GL minor version from the server.
648 */
649
650 void
651 __glXCalculateUsableGLExtensions(struct glx_context * gc,
652 const char *server_string,
653 int major_version, int minor_version)
654 {
655 unsigned char server_support[__GL_EXT_BYTES];
656 unsigned char usable[__GL_EXT_BYTES];
657 unsigned i;
658
659
660 __glXExtensionsCtr();
661
662 (void) memset(server_support, 0, sizeof(server_support));
663 __glXProcessServerString(known_gl_extensions, server_string,
664 server_support);
665
666
667 /* Handle lazy servers that don't export all the extensions strings that
668 * are part of the GL core version that they support.
669 */
670
671 for (i = 0; i < __GL_EXT_BYTES; i++) {
672 if ((known_gl_extensions[i].version_major != 0)
673 && ((major_version > known_gl_extensions[i].version_major)
674 || ((major_version == known_gl_extensions[i].version_major)
675 && (minor_version >=
676 known_gl_extensions[i].version_minor)))) {
677 SET_BIT(server_support, known_gl_extensions[i].bit);
678 }
679 }
680
681
682 /* An extension is supported if the client-side (i.e., libGL) supports
683 * it and the server supports it or the client-side library supports it
684 * and it only needs client-side support.
685 */
686
687 for (i = 0; i < __GL_EXT_BYTES; i++) {
688 usable[i] = (client_gl_support[i] & client_gl_only[i])
689 | (client_gl_support[i] & server_support[i]);
690 }
691
692 gc->extensions = (unsigned char *)
693 __glXGetStringFromTable(known_gl_extensions, usable);
694 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
695 }
696
697
698 /**
699 * Calculates the maximum core GL version that can be supported for indirect
700 * rendering.
701 */
702 void
703 __glXGetGLVersion(int *major_version, int *minor_version)
704 {
705 __glXExtensionsCtr();
706 *major_version = gl_major;
707 *minor_version = gl_minor;
708 }
709
710
711 /**
712 * Get a string representing the set of extensions supported by the client
713 * library. This is currently only used to send the list of extensions
714 * supported by the client to the server.
715 */
716 char *
717 __glXGetClientGLExtensionString(void)
718 {
719 __glXExtensionsCtr();
720 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
721 }