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