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 #include "util/driconf.h"
38
39 #define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8)))
40 #define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
41 #define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
42 #define CONCAT(a,b) a ## b
43 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
44 #define GL(n) "GL_" # n, 3 + sizeof( # n ) - 1, GL_ ## n ## _bit
45 #define VER(a,b) a, b
46 #define Y 1
47 #define N 0
48 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit ))
49
50
51 struct extension_info
52 {
53 const char *const name;
54 unsigned name_len;
55
56 unsigned char bit;
57
58 /* This is the lowest version of GLX that "requires" this extension.
59 * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
60 * SGI_make_current_read. If the extension is not required by any known
61 * version of GLX, use 0, 0.
62 */
63 unsigned char version_major;
64 unsigned char version_minor;
65
66 /**
67 * The client (i.e., libGL) supports this extension.
68 *
69 * Except during bring up, all extensions should have this set to Y. There
70 * are a few cases of extensions that have partial (or speculative)
71 * support, but these are rare. There also shouldn't be any new ones
72 * added.
73 *
74 * Generally, extensions require server support and ::client_support to be
75 * enabled. If the display is capable of direct rendering,
76 * ::direct_support is also required.
77 *
78 * \sa ::client_only
79 */
80 unsigned char client_support;
81
82 /**
83 * The direct-renderer (e.g., i965_dri.so) supports this extension.
84 *
85 * For cases where all of the infrastructure to support the extension is a
86 * required part of the loader/driver interface, this can default to Y.
87 * For most cases, extended functionality, usually in the form of DRI2
88 * extensions, is necessary to support the extension. The loader will set
89 * the flag true if all the requirements are met.
90 *
91 * If the display is capable of direct rendering, ::direct_support is
92 * required for the extension to be enabled.
93 */
94 unsigned char direct_support;
95
96 /**
97 * The extension depends only on client support.
98 *
99 * This is for extensions like GLX_ARB_get_proc_address that are contained
100 * entirely in the client library. There is no dependency on the server or
101 * the direct-renderer.
102 *
103 * These extensions will be enabled if ::client_support is set.
104 *
105 * \note
106 * An extension \b cannot be both client-only and direct-only because being
107 * direct-only implies a dependency on the direct renderer.
108 *
109 * \sa ::client_support, ::direct_only
110 */
111 unsigned char client_only;
112
113 /**
114 * The extension only functions with direct-rendering contexts
115 *
116 * The extension has no GLX protocol, and, therefore, no explicit
117 * dependency on the server. The functionality is contained entirely in
118 * the client library and the direct renderer. A few of the swap-related
119 * extensions are intended to behave this way.
120 *
121 * These extensions will be enabled if both ::client_support and
122 * ::direct_support are set.
123 *
124 * \note
125 * An extension \b cannot be both client-only and direct-only because being
126 * client-only implies that all functionality is outside the
127 * direct-renderer.
128 *
129 * \sa ::direct_support, ::client_only
130 */
131 unsigned char direct_only;
132 };
133
134 /* *INDENT-OFF* */
135 static const struct extension_info known_glx_extensions[] = {
136 { GLX(ARB_context_flush_control), VER(0,0), Y, N, N, N },
137 { GLX(ARB_create_context), VER(0,0), Y, N, N, N },
138 { GLX(ARB_create_context_no_error), VER(1,4), Y, N, N, N },
139 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N },
140 { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N },
141 { GLX(ARB_fbconfig_float), VER(0,0), Y, Y, N, N },
142 { GLX(ARB_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
143 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N },
144 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N },
145 { GLX(EXT_buffer_age), VER(0,0), Y, N, N, Y },
146 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, N },
147 { GLX(EXT_create_context_es_profile), VER(0,0), Y, N, N, N },
148 { GLX(EXT_fbconfig_packed_float), VER(0,0), Y, Y, N, N },
149 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N },
150 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N },
151 { GLX(EXT_swap_control), VER(0,0), Y, N, N, Y },
152 { GLX(EXT_swap_control_tear), VER(0,0), Y, N, N, Y },
153 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N },
154 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N },
155 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N },
156 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N },
157 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N },
158 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N },
159 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, N, Y },
160 { GLX(MESA_query_renderer), VER(0,0), Y, N, N, Y },
161 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y },
162 { GLX(NV_float_buffer), VER(0,0), N, N, N, N },
163 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N },
164 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y },
165 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N },
166 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N },
167 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N },
168 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N },
169 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N },
170 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N },
171 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y },
172 { NULL }
173 };
174
175 static const struct extension_info known_gl_extensions[] = {
176 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N },
177 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N },
178 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N },
179 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N },
180 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N },
181 { GL(ARB_imaging), VER(0,0), Y, N, N, N },
182 { GL(ARB_multisample), VER(1,3), Y, N, N, N },
183 { GL(ARB_multitexture), VER(1,3), Y, N, N, N },
184 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N },
185 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N },
186 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N },
187 { GL(ARB_shadow), VER(1,4), Y, N, N, N },
188 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N },
189 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N },
190 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N },
191 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N },
192 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N },
193 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N },
194 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N },
195 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N },
196 { GL(ARB_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
197 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N },
198 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N },
199 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N },
200 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N },
201 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N },
202 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N },
203 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N },
204 { GL(ARB_window_pos), VER(1,4), Y, N, N, N },
205 { GL(EXT_abgr), VER(0,0), Y, N, N, N },
206 { GL(EXT_bgra), VER(1,2), Y, N, N, N },
207 { GL(EXT_blend_color), VER(1,4), Y, N, N, N },
208 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N },
209 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N },
210 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N },
211 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N },
212 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N },
213 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N },
214 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N },
215 { GL(EXT_convolution), VER(0,0), N, N, N, N },
216 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N },
217 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N },
218 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N },
219 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N },
220 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N },
221 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N },
222 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N },
223 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N },
224 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N },
225 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N },
226 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N },
227 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N },
228 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N },
229 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N },
230 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N },
231 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N },
232 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N },
233 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N },
234 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N },
235 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N },
236 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N },
237 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N },
238 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N },
239 { GL(EXT_subtexture), VER(1,1), Y, N, N, N },
240 { GL(EXT_texture), VER(1,1), Y, N, N, N },
241 { GL(EXT_texture3D), VER(1,2), Y, N, N, N },
242 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N },
243 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N },
244 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N },
245 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N },
246 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N },
247 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N },
248 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
249 { GL(EXT_texture_integer), VER(0,0), Y, N, N, N },
250 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N },
251 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N },
252 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N },
253 { GL(EXT_texture_object), VER(1,1), Y, N, N, N },
254 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N },
255 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N },
256 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N },
257 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N },
258 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N },
259 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N },
260 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N },
261 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N },
262 { GL(ATI_texture_float), VER(0,0), Y, N, N, N },
263 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N },
264 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N },
265 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N },
266 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N },
267 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N },
268 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N },
269 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N },
270 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N },
271 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N },
272 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N },
273 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N },
274 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N },
275 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N },
276 { GL(NV_blend_square), VER(1,4), Y, N, N, N },
277 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N },
278 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N },
279 { GL(NV_fog_distance), VER(0,0), Y, N, N, N },
280 { GL(NV_fragment_program), VER(0,0), Y, N, N, N },
281 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N },
282 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N },
283 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N },
284 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N },
285 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N },
286 { GL(NV_point_sprite), VER(0,0), Y, N, N, N },
287 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N },
288 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N },
289 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N },
290 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N },
291 { GL(NV_vertex_program), VER(0,0), Y, N, N, N },
292 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N },
293 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N },
294 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N },
295 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N },
296 { GL(OES_read_format), VER(0,0), Y, N, N, N },
297 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
298 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N },
299 { GL(SGI_color_table), VER(0,0), Y, N, N, N },
300 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N },
301 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N },
302 { GL(SGIS_multisample), VER(0,0), Y, N, N, N },
303 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N },
304 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N },
305 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N },
306 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N },
307 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N },
308 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N },
309 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N },
310 { GL(SGIX_shadow), VER(0,0), Y, N, N, N },
311 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N },
312 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N },
313 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N },
314 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N },
315 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N },
316 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N },
317 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N },
318 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N },
319 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N },
320 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N },
321 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N },
322 { NULL }
323 };
324 /* *INDENT-ON* */
325
326
327 /* global bit-fields of available extensions and their characteristics */
328 static unsigned char client_glx_support[__GLX_EXT_BYTES];
329 static unsigned char client_glx_only[__GLX_EXT_BYTES];
330 static unsigned char direct_glx_only[__GLX_EXT_BYTES];
331 static unsigned char client_gl_support[__GL_EXT_BYTES];
332 static unsigned char client_gl_only[__GL_EXT_BYTES];
333
334 /**
335 * Bits representing the set of extensions that are enabled by default in all
336 * direct rendering drivers.
337 */
338 static unsigned char direct_glx_support[__GLX_EXT_BYTES];
339
340 /**
341 * Highest core GL version that can be supported for indirect rendering.
342 */
343 static const unsigned gl_major = 1;
344 static const unsigned gl_minor = 4;
345
346 /* client extensions string */
347 static const char *__glXGLXClientExtensions = NULL;
348
349 static void __glXExtensionsCtr(void);
350 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
351 static void __glXProcessServerString(const struct extension_info *ext,
352 const char *server_string,
353 unsigned char *server_support);
354
355 /**
356 * Find an extension in the list based on its name.
357 *
358 * \param ext List of extensions where to search.
359 * \param name Name of the extension.
360 * \param name_len Length, in characters, of the extension name.
361 */
362 static const struct extension_info *
find_extension(const struct extension_info * ext,const char * name,unsigned name_len)363 find_extension(const struct extension_info *ext, const char *name,
364 unsigned name_len)
365 {
366 unsigned i;
367
368 for (i = 0; ext[i].name != NULL; i++) {
369 if ((name_len == ext[i].name_len)
370 && (strncmp(ext[i].name, name, name_len) == 0)) {
371 return &ext[i];
372 }
373 }
374
375 return NULL;
376 }
377
378 /**
379 * Set the state of a GLX extension.
380 *
381 * \param name Name of the extension.
382 * \param name_len Length, in characters, of the extension name.
383 * \param state New state (either enabled or disabled) of the extension.
384 * \param supported Table in which the state of the extension is to be set.
385 */
386 static void
set_glx_extension(const struct extension_info * ext_list,const char * name,unsigned name_len,GLboolean state,unsigned char * supported)387 set_glx_extension(const struct extension_info *ext_list,
388 const char *name, unsigned name_len, GLboolean state,
389 unsigned char *supported)
390 {
391 const struct extension_info *ext = find_extension(ext_list, name, name_len);
392 if (!ext)
393 return;
394
395 if (state) {
396 SET_BIT(supported, ext->bit);
397 } else {
398 CLR_BIT(supported, ext->bit);
399 }
400 }
401
402
403 #define NUL '\0'
404 #define SEPARATOR ' '
405
406 /**
407 * Convert the server's extension string to a bit-field.
408 *
409 * \param server_string GLX extension string from the server.
410 * \param server_support Bit-field of supported extensions.
411 *
412 * \note
413 * This function is used to process both GLX and GL extension strings. The
414 * bit-fields used to track each of these have different sizes. Therefore,
415 * the data pointed by \c server_support must be preinitialized to zero.
416 */
417 static void
__glXProcessServerString(const struct extension_info * ext,const char * server_string,unsigned char * server_support)418 __glXProcessServerString(const struct extension_info *ext,
419 const char *server_string,
420 unsigned char *server_support)
421 {
422 unsigned base;
423 unsigned len;
424
425 for (base = 0; server_string[base] != NUL; /* empty */ ) {
426 /* Determine the length of the next extension name.
427 */
428 for (len = 0; (server_string[base + len] != SEPARATOR)
429 && (server_string[base + len] != NUL); len++) {
430 /* empty */
431 }
432
433 /* Set the bit for the extension in the server_support table.
434 */
435 set_glx_extension(ext, &server_string[base], len, GL_TRUE,
436 server_support);
437
438
439 /* Advance to the next extension string. This means that we skip
440 * over the previous string and any trialing white-space.
441 */
442 for (base += len; (server_string[base] == SEPARATOR)
443 && (server_string[base] != NUL); base++) {
444 /* empty */
445 }
446 }
447 }
448
449 void
__glXEnableDirectExtension(struct glx_screen * psc,const char * name)450 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
451 {
452 __glXExtensionsCtr();
453 __glXExtensionsCtrScreen(psc);
454
455 set_glx_extension(known_glx_extensions,
456 name, strlen(name), GL_TRUE, psc->direct_support);
457 }
458
459 static void
__ParseExtensionOverride(struct glx_screen * psc,const struct extension_info * ext_list,unsigned char * force_enable,unsigned char * force_disable,const char * override)460 __ParseExtensionOverride(struct glx_screen *psc,
461 const struct extension_info *ext_list,
462 unsigned char *force_enable,
463 unsigned char *force_disable,
464 const char *override)
465 {
466 const struct extension_info *ext;
467 char *env, *field;
468
469 if (override == NULL)
470 return;
471
472 /* Copy env_const because strtok() is destructive. */
473 env = strdup(override);
474 if (env == NULL)
475 return;
476
477 for (field = strtok(env, " "); field!= NULL; field = strtok(NULL, " ")) {
478 GLboolean enable;
479
480 switch (field[0]) {
481 case '+':
482 enable = GL_TRUE;
483 ++field;
484 break;
485 case '-':
486 enable = GL_FALSE;
487 ++field;
488 break;
489 default:
490 enable = GL_TRUE;
491 break;
492 }
493
494 ext = find_extension(ext_list, field, strlen(field));
495 if (ext) {
496 if (enable)
497 SET_BIT(force_enable, ext->bit);
498 else
499 SET_BIT(force_disable, ext->bit);
500 } else {
501 fprintf(stderr, "WARNING: Trying to %s the unknown extension '%s'\n",
502 enable ? "enable" : "disable", field);
503 }
504 }
505
506 free(env);
507 }
508
509 /**
510 * \brief Parse the list of GLX extensions that the user wants to
511 * force-enable/disable by using \c override, and write the results to the
512 * screen's context.
513 *
514 * \param psc Pointer to GLX per-screen record.
515 * \param override A space-separated list of extensions to enable or disable.
516 * The list is processed thus:
517 * - Enable recognized extension names that are prefixed with '+'.
518 * - Disable recognized extension names that are prefixed with '-'.
519 * - Enable recognized extension names that are not prefixed.
520 */
521 void
__glXParseExtensionOverride(struct glx_screen * psc,const char * override)522 __glXParseExtensionOverride(struct glx_screen *psc, const char *override)
523 {
524 __ParseExtensionOverride(psc, known_glx_extensions, psc->glx_force_enabled,
525 psc->glx_force_disabled, override);
526 }
527
528 /**
529 * \brief Parse the list of GL extensions that the user wants to
530 * force-enable/disable by using \c override, and write the results to the
531 * screen's context.
532 *
533 * \param psc Pointer to GLX per-screen record.
534 * \param override A space-separated list of extensions to enable or disable.
535 * The list is processed thus:
536 * - Enable recognized extension names that are prefixed with '+'.
537 * - Disable recognized extension names that are prefixed with '-'.
538 * - Enable recognized extension names that are not prefixed.
539 */
540 void
__IndirectGlParseExtensionOverride(struct glx_screen * psc,const char * override)541 __IndirectGlParseExtensionOverride(struct glx_screen *psc, const char *override)
542 {
543 __ParseExtensionOverride(psc, known_gl_extensions, psc->gl_force_enabled,
544 psc->gl_force_disabled, override);
545 }
546
547
548 /**
549 * Initialize global extension support tables.
550 */
551
552 static void
__glXExtensionsCtr(void)553 __glXExtensionsCtr(void)
554 {
555 unsigned i;
556 static GLboolean ext_list_first_time = GL_TRUE;
557
558
559 if (ext_list_first_time) {
560 ext_list_first_time = GL_FALSE;
561
562 (void) memset(client_glx_support, 0, sizeof(client_glx_support));
563 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
564 (void) memset(client_glx_only, 0, sizeof(client_glx_only));
565 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
566
567 (void) memset(client_gl_support, 0, sizeof(client_gl_support));
568 (void) memset(client_gl_only, 0, sizeof(client_gl_only));
569
570 for (i = 0; known_glx_extensions[i].name != NULL; i++) {
571 const unsigned bit = known_glx_extensions[i].bit;
572
573 if (known_glx_extensions[i].client_support) {
574 SET_BIT(client_glx_support, bit);
575 }
576
577 if (known_glx_extensions[i].direct_support) {
578 SET_BIT(direct_glx_support, bit);
579 }
580
581 if (known_glx_extensions[i].client_only) {
582 SET_BIT(client_glx_only, bit);
583 }
584
585 if (known_glx_extensions[i].direct_only) {
586 SET_BIT(direct_glx_only, bit);
587 }
588 }
589
590 for (i = 0; known_gl_extensions[i].name != NULL; i++) {
591 const unsigned bit = known_gl_extensions[i].bit;
592
593 if (known_gl_extensions[i].client_support) {
594 SET_BIT(client_gl_support, bit);
595 }
596
597 if (known_gl_extensions[i].client_only) {
598 SET_BIT(client_gl_only, bit);
599 }
600 }
601
602 #if 0
603 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
604 __func__, __LINE__, gl_major, gl_minor);
605 #endif
606 }
607 }
608
609
610 /**
611 * Make sure that per-screen direct-support table is initialized.
612 *
613 * \param psc Pointer to GLX per-screen record.
614 */
615
616 static void
__glXExtensionsCtrScreen(struct glx_screen * psc)617 __glXExtensionsCtrScreen(struct glx_screen * psc)
618 {
619 if (psc->ext_list_first_time) {
620 psc->ext_list_first_time = GL_FALSE;
621 (void) memcpy(psc->direct_support, direct_glx_support,
622 sizeof(direct_glx_support));
623 (void) memset(psc->glx_force_enabled, 0,
624 sizeof(psc->glx_force_enabled));
625 (void) memset(psc->glx_force_disabled, 0,
626 sizeof(psc->glx_force_disabled));
627 (void) memset(psc->gl_force_enabled, 0,
628 sizeof(psc->gl_force_enabled));
629 (void) memset(psc->gl_force_disabled, 0,
630 sizeof(psc->gl_force_disabled));
631 }
632 }
633
634
635 /**
636 * Check if a certain extension is enabled on a given screen.
637 *
638 * \param psc Pointer to GLX per-screen record.
639 * \param bit Bit index in the direct-support table.
640 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
641 * returned. If the extension bit is not enabled or if \c psc is
642 * \c NULL, then \c GL_FALSE is returned.
643 */
644 GLboolean
__glXExtensionBitIsEnabled(struct glx_screen * psc,unsigned bit)645 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
646 {
647 GLboolean enabled = GL_FALSE;
648
649 if (psc != NULL) {
650 __glXExtensionsCtr();
651 __glXExtensionsCtrScreen(psc);
652 enabled = EXT_ENABLED(bit, psc->direct_support);
653 }
654
655 return enabled;
656 }
657
658
659 /**
660 * Check if a certain extension is enabled in a given context.
661 *
662 */
663 GLboolean
__glExtensionBitIsEnabled(struct glx_context * gc,unsigned bit)664 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
665 {
666 GLboolean enabled = GL_FALSE;
667
668 if (gc != NULL) {
669 enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
670 }
671
672 return enabled;
673 }
674
675
676
677 /**
678 * Convert a bit-field to a string of supported extensions.
679 */
680 static char *
__glXGetStringFromTable(const struct extension_info * ext,const unsigned char * supported)681 __glXGetStringFromTable(const struct extension_info *ext,
682 const unsigned char *supported)
683 {
684 unsigned i;
685 unsigned ext_str_len;
686 char *ext_str;
687 char *point;
688
689
690 ext_str_len = 0;
691 for (i = 0; ext[i].name != NULL; i++) {
692 if (EXT_ENABLED(ext[i].bit, supported)) {
693 ext_str_len += ext[i].name_len + 1;
694 }
695 }
696
697 ext_str = malloc(ext_str_len + 1);
698 if (ext_str != NULL) {
699 point = ext_str;
700
701 for (i = 0; ext[i].name != NULL; i++) {
702 if (EXT_ENABLED(ext[i].bit, supported)) {
703 (void) memcpy(point, ext[i].name, ext[i].name_len);
704 point += ext[i].name_len;
705
706 *point = ' ';
707 point++;
708 }
709 }
710
711 *point = '\0';
712 }
713
714 return ext_str;
715 }
716
717
718 /**
719 * Get the string of client library supported extensions.
720 */
721 const char *
__glXGetClientExtensions(void)722 __glXGetClientExtensions(void)
723 {
724 if (__glXGLXClientExtensions == NULL) {
725 __glXExtensionsCtr();
726 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
727 client_glx_support);
728 }
729
730 return __glXGLXClientExtensions;
731 }
732
733
734 /**
735 * Calculate the list of application usable extensions. The resulting
736 * string is stored in \c psc->effectiveGLXexts.
737 *
738 * \param psc Pointer to GLX per-screen record.
739 * \param display_is_direct_capable True if the display is capable of
740 * direct rendering.
741 * \param minor_version GLX minor version from the server.
742 */
743
744 void
__glXCalculateUsableExtensions(struct glx_screen * psc,GLboolean display_is_direct_capable,int minor_version)745 __glXCalculateUsableExtensions(struct glx_screen * psc,
746 GLboolean display_is_direct_capable,
747 int minor_version)
748 {
749 unsigned char server_support[__GLX_EXT_BYTES];
750 unsigned char usable[__GLX_EXT_BYTES];
751 unsigned i;
752
753 __glXExtensionsCtr();
754 __glXExtensionsCtrScreen(psc);
755
756 (void) memset(server_support, 0, sizeof(server_support));
757 __glXProcessServerString(known_glx_extensions,
758 psc->serverGLXexts, server_support);
759
760
761 /* This is a hack. Some servers support GLX 1.3 but don't export
762 * all of the extensions implied by GLX 1.3. If the server claims
763 * support for GLX 1.3, enable support for the extensions that can be
764 * "emulated" as well.
765 */
766 #ifndef GLX_USE_APPLEGL
767 if (minor_version >= 3) {
768 SET_BIT(server_support, EXT_visual_info_bit);
769 SET_BIT(server_support, EXT_visual_rating_bit);
770 SET_BIT(server_support, SGI_make_current_read_bit);
771 SET_BIT(server_support, SGIX_fbconfig_bit);
772 SET_BIT(server_support, SGIX_pbuffer_bit);
773
774 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this
775 * extension. However, the only part that is not strictly client-side
776 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT
777 * function.
778 */
779
780 SET_BIT(server_support, EXT_import_context_bit);
781 }
782 #endif
783
784 /* An extension is supported if the client-side (i.e., libGL) supports
785 * it and the "server" supports it. In this case that means that either
786 * the true server supports it or it is only for direct-rendering and
787 * the direct rendering driver supports it.
788 *
789 * If the display is not capable of direct rendering, then the extension
790 * is enabled if and only if the client-side library and the server
791 * support it.
792 */
793
794 if (display_is_direct_capable) {
795 for (i = 0; i < __GLX_EXT_BYTES; i++) {
796 /* Enable extensions that the client supports that only have a client-side
797 * component.
798 */
799 unsigned char u = client_glx_support[i] & client_glx_only[i];
800
801 /* Enable extensions that the client supports, are supported for direct
802 * rendering, and either are supported by the server or only have a
803 * direct-rendering component.
804 */
805 u |= client_glx_support[i] & psc->direct_support[i] &
806 (server_support[i] | direct_glx_only[i]);
807
808 /* Finally, apply driconf options to force some extension bits either
809 * enabled or disabled.
810 */
811 u |= psc->glx_force_enabled[i];
812 u &= ~psc->glx_force_disabled[i];
813
814 usable[i] = u;
815 }
816 }
817 else {
818 for (i = 0; i < __GLX_EXT_BYTES; i++) {
819 /* Enable extensions that the client supports that only have a
820 * client-side component.
821 */
822 unsigned char u = client_glx_support[i] & client_glx_only[i];
823
824 /* Enable extensions that the client and server both support */
825 u |= client_glx_support[i] & server_support[i];
826
827 /* Finally, apply driconf options to force some extension bits either
828 * enabled or disabled.
829 */
830 u |= psc->glx_force_enabled[i];
831 u &= ~psc->glx_force_disabled[i];
832
833 usable[i] = u;
834 }
835 }
836
837 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
838 usable);
839 }
840
841
842 /**
843 * Calculate the list of application usable extensions. The resulting
844 * string is stored in \c gc->extensions.
845 *
846 * \param gc Pointer to GLX context.
847 * \param server_string Extension string from the server.
848 * \param major_version GL major version from the server.
849 * \param minor_version GL minor version from the server.
850 */
851
852 void
__glXCalculateUsableGLExtensions(struct glx_context * gc,const char * server_string,int major_version,int minor_version)853 __glXCalculateUsableGLExtensions(struct glx_context * gc,
854 const char *server_string,
855 int major_version, int minor_version)
856 {
857 struct glx_screen *psc = gc->psc;
858 unsigned char server_support[__GL_EXT_BYTES];
859 unsigned char usable[__GL_EXT_BYTES];
860 unsigned i;
861
862
863 __glXExtensionsCtr();
864
865 (void) memset(server_support, 0, sizeof(server_support));
866 __glXProcessServerString(known_gl_extensions, server_string,
867 server_support);
868
869
870 /* Handle lazy servers that don't export all the extensions strings that
871 * are part of the GL core version that they support.
872 */
873
874 for (i = 0; i < __GL_EXT_BYTES; i++) {
875 if ((known_gl_extensions[i].version_major != 0)
876 && ((major_version > known_gl_extensions[i].version_major)
877 || ((major_version == known_gl_extensions[i].version_major)
878 && (minor_version >=
879 known_gl_extensions[i].version_minor)))) {
880 SET_BIT(server_support, known_gl_extensions[i].bit);
881 }
882 }
883
884
885 /* An extension is supported if the client-side (i.e., libGL) supports
886 * it and the server supports it or the client-side library supports it
887 * and it only needs client-side support.
888 */
889
890 for (i = 0; i < __GL_EXT_BYTES; i++) {
891 usable[i] = ((client_gl_support[i] & client_gl_only[i])
892 | (client_gl_support[i] & server_support[i])
893 | psc->gl_force_enabled[i]) & ~psc->gl_force_disabled[i];
894 }
895
896 gc->extensions = (unsigned char *)
897 __glXGetStringFromTable(known_gl_extensions, usable);
898 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
899 }
900
901
902 /**
903 * Calculates the maximum core GL version that can be supported for indirect
904 * rendering.
905 */
906 void
__glXGetGLVersion(int * major_version,int * minor_version)907 __glXGetGLVersion(int *major_version, int *minor_version)
908 {
909 __glXExtensionsCtr();
910 *major_version = gl_major;
911 *minor_version = gl_minor;
912 }
913
914
915 /**
916 * Get a string representing the set of extensions supported by the client
917 * library. This is currently only used to send the list of extensions
918 * supported by the client to the server.
919 */
920 char *
__glXGetClientGLExtensionString(void)921 __glXGetClientGLExtensionString(void)
922 {
923 __glXExtensionsCtr();
924 return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
925 }
926