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
65 /**
66 * The client (i.e., libGL) supports this extension.
67 *
68 * Except during bring up, all extensions should have this set to Y. There
69 * are a few cases of extensions that have partial (or speculative)
70 * support, but these are rare. There also shouldn't be any new ones
71 * added.
72 *
73 * Generally, extensions require server support and ::client_support to be
74 * enabled. If the display is capable of direct rendering,
75 * ::direct_support is also required.
76 *
77 * \sa ::client_only
78 */
79 unsigned char client_support;
80
81 /**
82 * The direct-renderer (e.g., i965_dri.so) supports this extension.
83 *
84 * For cases where all of the infrastructure to support the extension is a
85 * required part of the loader/driver interface, this can default to Y.
86 * For most cases, extended functionality, usually in the form of DRI2
87 * extensions, is necessary to support the extension. The loader will set
88 * the flag true if all the requirements are met.
89 *
90 * If the display is capable of direct rendering, ::direct_support is
91 * required for the extension to be enabled.
92 */
93 unsigned char direct_support;
94
95 /**
96 * The extension depends only on client support.
97 *
98 * This is for extensions like GLX_ARB_get_proc_address that are contained
99 * entirely in the client library. There is no dependency on the server or
100 * the direct-renderer.
101 *
102 * These extensions will be enabled if ::client_support is set.
103 *
104 * \note
105 * An extension \b cannot be both client-only and direct-only because being
106 * direct-only implies a dependency on the direct renderer.
107 *
108 * \sa ::client_support, ::direct_only
109 */
110 unsigned char client_only;
111
112 /**
113 * The extension only functions with direct-rendering contexts
114 *
115 * The extension has no GLX protocol, and, therefore, no explicit
116 * dependency on the server. The functionality is contained entirely in
117 * the client library and the direct renderer. A few of the swap-related
118 * extensions are intended to behave this way.
119 *
120 * These extensions will be enabled if both ::client_support and
121 * ::direct_support are set.
122 *
123 * \note
124 * An extension \b cannot be both client-only and direct-only because being
125 * client-only implies that all functionality is outside the
126 * direct-renderer.
127 *
128 * \sa ::direct_support, ::client_only
129 */
130 unsigned char direct_only;
131 };
132
133 /* *INDENT-OFF* */
134 static const struct extension_info known_glx_extensions[] = {
135 { GLX(ARB_create_context), VER(0,0), Y, N, N, N },
136 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N },
137 { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N },
138 { GLX(ARB_fbconfig_float), VER(0,0), Y, Y, N, N },
139 { GLX(ARB_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
140 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N },
141 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N },
142 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N },
143 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N },
144 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N },
145 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N },
146 { GLX(EXT_fbconfig_packed_float), VER(0,0), Y, Y, N, N },
147 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
148 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, N },
149 { GLX(EXT_create_context_es_profile), VER(0,0), Y, N, N, N },
150 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
151 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
152 { GLX(MESA_query_renderer), VER(0,0), Y, N, N, Y },
153 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
154 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
155 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
156 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
157 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
158 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
159 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
160 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N },
161 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N },
162 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N },
163 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N },
164 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N },
165 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N },
166 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N },
167 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N },
168 { GLX(EXT_buffer_age), VER(0,0), Y, N, N, Y },
169 { NULL }
170 };
171
172 static const struct extension_info known_gl_extensions[] = {
173 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
174 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
175 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
176 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N },
177 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N },
178 { GL(ARB_imaging), VER(0,0), Y, N, N, N },
179 { GL(ARB_multisample), VER(1,3), Y, N, N, N },
180 { GL(ARB_multitexture), VER(1,3), Y, N, N, N },
181 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N },
182 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N },
183 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N },
184 { GL(ARB_shadow), VER(1,4), Y, N, N, N },
185 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N },
186 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N },
187 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N },
188 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N },
189 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N },
190 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N },
191 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N },
192 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N },
193 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N },
194 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N },
195 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N },
196 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N },
197 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
198 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
199 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
200 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
201 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
202 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
203 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
204 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
205 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
206 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
207 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
208 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
209 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
210 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
211 { GL(EXT_convolution), VER(0,0), N, N, N, N },
212 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
213 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
214 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
215 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
216 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
217 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N },
218 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N },
219 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
220 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N },
221 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
222 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N },
223 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
224 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
225 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
226 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
227 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
228 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
229 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
230 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
231 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
232 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
233 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
234 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
235 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
236 { GL(EXT_texture), VER(1,1), Y, N, N, N },
237 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
238 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
239 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
240 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
241 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
242 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
243 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
244 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
245 { GL(EXT_texture_integer), VER(0,0), Y, N, N, N },
246 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
247 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
248 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
249 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
250 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
251 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
252 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
253 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
254 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
255 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
256 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
257 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
258 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
259 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
260 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
261 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
262 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
263 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
264 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
265 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
266 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
267 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
268 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
269 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
270 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
271 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
272 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
273 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
274 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
275 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
276 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
277 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
278 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
279 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
280 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
281 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N },
282 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
283 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
284 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
285 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
286 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
287 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
288 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
289 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
290 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
291 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
292 { GL(OES_read_format), VER(0,0), Y, N, N, N },
293 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
294 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
295 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
296 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
297 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
298 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
299 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
300 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
301 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
302 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
303 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
304 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
305 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
306 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
307 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
308 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
309 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
310 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
311 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
312 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
313 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
314 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
315 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
316 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
317 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
318 { NULL }
319 };
320 /* *INDENT-ON* */
321
322
323 /* global bit-fields of available extensions and their characteristics */
324 static unsigned char client_glx_support[8];
325 static unsigned char client_glx_only[8];
326 static unsigned char direct_glx_only[8];
327 static unsigned char client_gl_support[__GL_EXT_BYTES];
328 static unsigned char client_gl_only[__GL_EXT_BYTES];
329
330 /**
331 * Bits representing the set of extensions that are enabled by default in all
332 * direct rendering drivers.
333 */
334 static unsigned char direct_glx_support[8];
335
336 /**
337 * Highest core GL version that can be supported for indirect rendering.
338 */
339 static const unsigned gl_major = 1;
340 static const unsigned gl_minor = 4;
341
342 /* client extensions string */
343 static const char *__glXGLXClientExtensions = NULL;
344
345 static void __glXExtensionsCtr(void);
346 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
347 static void __glXProcessServerString(const struct extension_info *ext,
348 const char *server_string,
349 unsigned char *server_support);
350
351 /**
352 * Set the state of a GLX extension.
353 *
354 * \param name Name of the extension.
355 * \param name_len Length, in characters, of the extension name.
356 * \param state New state (either enabled or disabled) of the extension.
357 * \param supported Table in which the state of the extension is to be set.
358 */
359 static void
set_glx_extension(const struct extension_info * ext,const char * name,unsigned name_len,GLboolean state,unsigned char * supported)360 set_glx_extension(const struct extension_info *ext,
361 const char *name, unsigned name_len, GLboolean state,
362 unsigned char *supported)
363 {
364 unsigned i;
365
366
367 for (i = 0; ext[i].name != NULL; i++) {
368 if ((name_len == ext[i].name_len)
369 && (strncmp(ext[i].name, name, name_len) == 0)) {
370 if (state) {
371 SET_BIT(supported, ext[i].bit);
372 }
373 else {
374 CLR_BIT(supported, ext[i].bit);
375 }
376
377 return;
378 }
379 }
380 }
381
382
383 #define NUL '\0'
384 #define SEPARATOR ' '
385
386 /**
387 * Convert the server's extension string to a bit-field.
388 *
389 * \param server_string GLX extension string from the server.
390 * \param server_support Bit-field of supported extensions.
391 *
392 * \note
393 * This function is used to process both GLX and GL extension strings. The
394 * bit-fields used to track each of these have different sizes. Therefore,
395 * the data pointed by \c server_support must be preinitialized to zero.
396 */
397 static void
__glXProcessServerString(const struct extension_info * ext,const char * server_string,unsigned char * server_support)398 __glXProcessServerString(const struct extension_info *ext,
399 const char *server_string,
400 unsigned char *server_support)
401 {
402 unsigned base;
403 unsigned len;
404
405 for (base = 0; server_string[base] != NUL; /* empty */ ) {
406 /* Determine the length of the next extension name.
407 */
408 for (len = 0; (server_string[base + len] != SEPARATOR)
409 && (server_string[base + len] != NUL); len++) {
410 /* empty */
411 }
412
413 /* Set the bit for the extension in the server_support table.
414 */
415 set_glx_extension(ext, &server_string[base], len, GL_TRUE,
416 server_support);
417
418
419 /* Advance to the next extension string. This means that we skip
420 * over the previous string and any trialing white-space.
421 */
422 for (base += len; (server_string[base] == SEPARATOR)
423 && (server_string[base] != NUL); base++) {
424 /* empty */
425 }
426 }
427 }
428
429 void
__glXEnableDirectExtension(struct glx_screen * psc,const char * name)430 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
431 {
432 __glXExtensionsCtr();
433 __glXExtensionsCtrScreen(psc);
434
435 set_glx_extension(known_glx_extensions,
436 name, strlen(name), GL_TRUE, psc->direct_support);
437 }
438
439 /**
440 * Initialize global extension support tables.
441 */
442
443 static void
__glXExtensionsCtr(void)444 __glXExtensionsCtr(void)
445 {
446 unsigned i;
447 static GLboolean ext_list_first_time = GL_TRUE;
448
449
450 if (ext_list_first_time) {
451 ext_list_first_time = GL_FALSE;
452
453 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
454 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
455 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
456 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
457
458 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
459 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
460
461 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
462 const unsigned bit = known_glx_extensions[i].bit;
463
464 if (known_glx_extensions[i].client_support) {
465 SET_BIT(client_glx_support, bit);
466 }
467
468 if (known_glx_extensions[i].direct_support) {
469 SET_BIT(direct_glx_support, bit);
470 }
471
472 if (known_glx_extensions[i].client_only) {
473 SET_BIT(client_glx_only, bit);
474 }
475
476 if (known_glx_extensions[i].direct_only) {
477 SET_BIT(direct_glx_only, bit);
478 }
479 }
480
481 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
482 const unsigned bit = known_gl_extensions[i].bit;
483
484 if (known_gl_extensions[i].client_support) {
485 SET_BIT(client_gl_support, bit);
486 }
487
488 if (known_gl_extensions[i].client_only) {
489 SET_BIT(client_gl_only, bit);
490 }
491 }
492
493 #if 0
494 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
495 __func__, __LINE__, gl_major, gl_minor);
496 #endif
497 }
498 }
499
500
501 /**
502 * Make sure that per-screen direct-support table is initialized.
503 *
504 * \param psc Pointer to GLX per-screen record.
505 */
506
507 static void
__glXExtensionsCtrScreen(struct glx_screen * psc)508 __glXExtensionsCtrScreen(struct glx_screen * psc)
509 {
510 if (psc->ext_list_first_time) {
511 psc->ext_list_first_time = GL_FALSE;
512 (void) memcpy(psc->direct_support, direct_glx_support,
513 sizeof(direct_glx_support));
514 }
515 }
516
517
518 /**
519 * Check if a certain extension is enabled on a given screen.
520 *
521 * \param psc Pointer to GLX per-screen record.
522 * \param bit Bit index in the direct-support table.
523 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
524 * returned. If the extension bit is not enabled or if \c psc is
525 * \c NULL, then \c GL_FALSE is returned.
526 */
527 GLboolean
__glXExtensionBitIsEnabled(struct glx_screen * psc,unsigned bit)528 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
529 {
530 GLboolean enabled = GL_FALSE;
531
532 if (psc != NULL) {
533 __glXExtensionsCtr();
534 __glXExtensionsCtrScreen(psc);
535 enabled = EXT_ENABLED(bit, psc->direct_support);
536 }
537
538 return enabled;
539 }
540
541
542 /**
543 * Check if a certain extension is enabled in a given context.
544 *
545 */
546 GLboolean
__glExtensionBitIsEnabled(struct glx_context * gc,unsigned bit)547 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
548 {
549 GLboolean enabled = GL_FALSE;
550
551 if (gc != NULL) {
552 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
553 }
554
555 return enabled;
556 }
557
558
559
560 /**
561 * Convert a bit-field to a string of supported extensions.
562 */
563 static char *
__glXGetStringFromTable(const struct extension_info * ext,const unsigned char * supported)564 __glXGetStringFromTable(const struct extension_info *ext,
565 const unsigned char *supported)
566 {
567 unsigned i;
568 unsigned ext_str_len;
569 char *ext_str;
570 char *point;
571
572
573 ext_str_len = 0;
574 for (i = 0; ext[i].name != NULL; i++) {
575 if (EXT_ENABLED(ext[i].bit, supported)) {
576 ext_str_len += ext[i].name_len + 1;
577 }
578 }
579
580 ext_str = malloc(ext_str_len + 1);
581 if (ext_str != NULL) {
582 point = ext_str;
583
584 for (i = 0; ext[i].name != NULL; i++) {
585 if (EXT_ENABLED(ext[i].bit, supported)) {
586 (void) memcpy(point, ext[i].name, ext[i].name_len);
587 point += ext[i].name_len;
588
589 *point = ' ';
590 point++;
591 }
592 }
593
594 *point = '\0';
595 }
596
597 return ext_str;
598 }
599
600
601 /**
602 * Get the string of client library supported extensions.
603 */
604 const char *
__glXGetClientExtensions(void)605 __glXGetClientExtensions(void)
606 {
607 if (__glXGLXClientExtensions == NULL) {
608 __glXExtensionsCtr();
609 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
610 client_glx_support);
611 }
612
613 return __glXGLXClientExtensions;
614 }
615
616
617 /**
618 * Calculate the list of application usable extensions. The resulting
619 * string is stored in \c psc->effectiveGLXexts.
620 *
621 * \param psc Pointer to GLX per-screen record.
622 * \param display_is_direct_capable True if the display is capable of
623 * direct rendering.
624 * \param minor_version GLX minor version from the server.
625 */
626
627 void
__glXCalculateUsableExtensions(struct glx_screen * psc,GLboolean display_is_direct_capable,int minor_version)628 __glXCalculateUsableExtensions(struct glx_screen * psc,
629 GLboolean display_is_direct_capable,
630 int minor_version)
631 {
632 unsigned char server_support[8];
633 unsigned char usable[8];
634 unsigned i;
635
636 __glXExtensionsCtr();
637 __glXExtensionsCtrScreen(psc);
638
639 (void) memset(server_support, 0, sizeof(server_support));
640 __glXProcessServerString(known_glx_extensions,
641 psc->serverGLXexts, server_support);
642
643
644 /* This is a hack. Some servers support GLX 1.3 but don't export
645 * all of the extensions implied by GLX 1.3. If the server claims
646 * support for GLX 1.3, enable support for the extensions that can be
647 * "emulated" as well.
648 */
649 #ifndef GLX_USE_APPLEGL
650 if (minor_version >= 3) {
651 SET_BIT(server_support, EXT_visual_info_bit);
652 SET_BIT(server_support, EXT_visual_rating_bit);
653 SET_BIT(server_support, SGI_make_current_read_bit);
654 SET_BIT(server_support, SGIX_fbconfig_bit);
655 SET_BIT(server_support, SGIX_pbuffer_bit);
656
657 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
658 * extension. However, the only part that is not strictly client-side
659 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
660 * function.
661 */
662
663 SET_BIT(server_support, EXT_import_context_bit);
664 }
665 #endif
666
667 /* An extension is supported if the client-side (i.e., libGL) supports
668 * it and the "server" supports it. In this case that means that either
669 * the true server supports it or it is only for direct-rendering and
670 * the direct rendering driver supports it.
671 *
672 * If the display is not capable of direct rendering, then the extension
673 * is enabled if and only if the client-side library and the server
674 * support it.
675 */
676
677 if (display_is_direct_capable) {
678 for (i = 0; i < 8; i++) {
679 usable[i] = (client_glx_support[i] & client_glx_only[i])
680 | (client_glx_support[i] & psc->direct_support[i] &
681 server_support[i])
682 | (client_glx_support[i] & psc->direct_support[i] &
683 direct_glx_only[i]);
684 }
685 }
686 else {
687 for (i = 0; i < 8; i++) {
688 usable[i] = (client_glx_support[i] & client_glx_only[i])
689 | (client_glx_support[i] & server_support[i]);
690 }
691 }
692
693 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
694 usable);
695 }
696
697
698 /**
699 * Calculate the list of application usable extensions. The resulting
700 * string is stored in \c gc->extensions.
701 *
702 * \param gc Pointer to GLX context.
703 * \param server_string Extension string from the server.
704 * \param major_version GL major version from the server.
705 * \param minor_version GL minor version from the server.
706 */
707
708 void
__glXCalculateUsableGLExtensions(struct glx_context * gc,const char * server_string,int major_version,int minor_version)709 __glXCalculateUsableGLExtensions(struct glx_context * gc,
710 const char *server_string,
711 int major_version, int minor_version)
712 {
713 unsigned char server_support[__GL_EXT_BYTES];
714 unsigned char usable[__GL_EXT_BYTES];
715 unsigned i;
716
717
718 __glXExtensionsCtr();
719
720 (void) memset(server_support, 0, sizeof(server_support));
721 __glXProcessServerString(known_gl_extensions, server_string,
722 server_support);
723
724
725 /* Handle lazy servers that don't export all the extensions strings that
726 * are part of the GL core version that they support.
727 */
728
729 for (i = 0; i < __GL_EXT_BYTES; i++) {
730 if ((known_gl_extensions[i].version_major != 0)
731 && ((major_version > known_gl_extensions[i].version_major)
732 || ((major_version == known_gl_extensions[i].version_major)
733 && (minor_version >=
734 known_gl_extensions[i].version_minor)))) {
735 SET_BIT(server_support, known_gl_extensions[i].bit);
736 }
737 }
738
739
740 /* An extension is supported if the client-side (i.e., libGL) supports
741 * it and the server supports it or the client-side library supports it
742 * and it only needs client-side support.
743 */
744
745 for (i = 0; i < __GL_EXT_BYTES; i++) {
746 usable[i] = (client_gl_support[i] & client_gl_only[i])
747 | (client_gl_support[i] & server_support[i]);
748 }
749
750 gc->extensions = (unsigned char *)
751 __glXGetStringFromTable(known_gl_extensions, usable);
752 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
753 }
754
755
756 /**
757 * Calculates the maximum core GL version that can be supported for indirect
758 * rendering.
759 */
760 void
__glXGetGLVersion(int * major_version,int * minor_version)761 __glXGetGLVersion(int *major_version, int *minor_version)
762 {
763 __glXExtensionsCtr();
764 *major_version = gl_major;
765 *minor_version = gl_minor;
766 }
767
768
769 /**
770 * Get a string representing the set of extensions supported by the client
771 * library. This is currently only used to send the list of extensions
772 * supported by the client to the server.
773 */
774 char *
__glXGetClientGLExtensionString(void)775 __glXGetClientGLExtensionString(void)
776 {
777 __glXExtensionsCtr();
778 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
779 }
780