glxextensions.c revision c9d25cf73fceebf55d5b1bbe0f3f6704a45223b5
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 50struct 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* */ 73static 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_get_proc_address), VER(1,4), Y, N, Y, N }, 77 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, 78 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, 79 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, 80 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, 81 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, 82 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 83 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 84 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N }, 85 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 86 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 87 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 88 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 89 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 90 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 91 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 92 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 93 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 94 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 95 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 96 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 97 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 98 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 99 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N }, 100 { NULL } 101}; 102 103static const struct extension_info known_gl_extensions[] = { 104 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 105 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 106 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 107 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 108 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 109 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 110 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 111 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 112 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 113 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 114 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 115 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 116 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 117 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 118 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 119 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 120 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 121 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 122 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 123 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 124 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 125 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 126 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 127 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N }, 128 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 129 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 130 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 131 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 132 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 133 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 134 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 135 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 136 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 137 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 138 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 139 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 140 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 141 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 142 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 143 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 144 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 145 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 146 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 147 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 148 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 149 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 150 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 151 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N }, 152 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 153 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 154 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 155 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 156 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 157 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 158 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 159 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 160 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 161 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 162 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 163 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 164 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 165 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 166 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 167 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 168 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 169 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 170 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 171 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 172 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 173 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 174 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 175 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 176 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 177 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 178 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 179 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 180 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 181 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 182 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 183 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 184 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 185 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 186 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 187 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 188 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 189 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 190 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 191 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 192 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 193 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 194 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 195 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 196 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 197 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 198 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 199 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 200 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 201 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 202 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 203 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 204 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 205 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 206 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 207 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 208 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 209 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 210 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 211 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 212 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 213 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 214 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 215 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 216 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 217 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 218 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 219 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 220 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 221 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 222 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 223 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 224 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 225 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 226 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 227 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 228 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 229 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 230 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 231 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 232 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 233 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 234 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 235 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 236 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 237 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 238 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 239 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 240 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 241 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 242 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 243 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 244 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 245 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 246 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 247 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 248 { NULL } 249}; 250/* *INDENT-ON* */ 251 252 253/* global bit-fields of available extensions and their characteristics */ 254static unsigned char client_glx_support[8]; 255static unsigned char client_glx_only[8]; 256static unsigned char direct_glx_only[8]; 257static unsigned char client_gl_support[__GL_EXT_BYTES]; 258static unsigned char client_gl_only[__GL_EXT_BYTES]; 259 260/** 261 * Bits representing the set of extensions that are enabled by default in all 262 * direct rendering drivers. 263 */ 264static unsigned char direct_glx_support[8]; 265 266/** 267 * Highest core GL version that can be supported for indirect rendering. 268 */ 269static const unsigned gl_major = 1; 270static const unsigned gl_minor = 4; 271 272/* client extensions string */ 273static const char *__glXGLXClientExtensions = NULL; 274 275static void __glXExtensionsCtr(void); 276static void __glXExtensionsCtrScreen(struct glx_screen * psc); 277static void __glXProcessServerString(const struct extension_info *ext, 278 const char *server_string, 279 unsigned char *server_support); 280 281/** 282 * Set the state of a GLX extension. 283 * 284 * \param name Name of the extension. 285 * \param name_len Length, in characters, of the extension name. 286 * \param state New state (either enabled or disabled) of the extension. 287 * \param supported Table in which the state of the extension is to be set. 288 */ 289static void 290set_glx_extension(const struct extension_info *ext, 291 const char *name, unsigned name_len, GLboolean state, 292 unsigned char *supported) 293{ 294 unsigned i; 295 296 297 for (i = 0; ext[i].name != NULL; i++) { 298 if ((name_len == ext[i].name_len) 299 && (strncmp(ext[i].name, name, name_len) == 0)) { 300 if (state) { 301 SET_BIT(supported, ext[i].bit); 302 } 303 else { 304 CLR_BIT(supported, ext[i].bit); 305 } 306 307 return; 308 } 309 } 310} 311 312 313#define NUL '\0' 314#define SEPARATOR ' ' 315 316/** 317 * Convert the server's extension string to a bit-field. 318 * 319 * \param server_string GLX extension string from the server. 320 * \param server_support Bit-field of supported extensions. 321 * 322 * \note 323 * This function is used to process both GLX and GL extension strings. The 324 * bit-fields used to track each of these have different sizes. Therefore, 325 * the data pointed by \c server_support must be preinitialized to zero. 326 */ 327static void 328__glXProcessServerString(const struct extension_info *ext, 329 const char *server_string, 330 unsigned char *server_support) 331{ 332 unsigned base; 333 unsigned len; 334 335 for (base = 0; server_string[base] != NUL; /* empty */ ) { 336 /* Determine the length of the next extension name. 337 */ 338 for (len = 0; (server_string[base + len] != SEPARATOR) 339 && (server_string[base + len] != NUL); len++) { 340 /* empty */ 341 } 342 343 /* Set the bit for the extension in the server_support table. 344 */ 345 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 346 server_support); 347 348 349 /* Advance to the next extension string. This means that we skip 350 * over the previous string and any trialing white-space. 351 */ 352 for (base += len; (server_string[base] == SEPARATOR) 353 && (server_string[base] != NUL); base++) { 354 /* empty */ 355 } 356 } 357} 358 359void 360__glXEnableDirectExtension(struct glx_screen * psc, const char *name) 361{ 362 __glXExtensionsCtr(); 363 __glXExtensionsCtrScreen(psc); 364 365 set_glx_extension(known_glx_extensions, 366 name, strlen(name), GL_TRUE, psc->direct_support); 367} 368 369/** 370 * Initialize global extension support tables. 371 */ 372 373static void 374__glXExtensionsCtr(void) 375{ 376 unsigned i; 377 static GLboolean ext_list_first_time = GL_TRUE; 378 379 380 if (ext_list_first_time) { 381 ext_list_first_time = GL_FALSE; 382 383 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 384 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 385 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 386 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 387 388 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 389 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 390 391 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 392 const unsigned bit = known_glx_extensions[i].bit; 393 394 if (known_glx_extensions[i].client_support) { 395 SET_BIT(client_glx_support, bit); 396 } 397 398 if (known_glx_extensions[i].direct_support) { 399 SET_BIT(direct_glx_support, bit); 400 } 401 402 if (known_glx_extensions[i].client_only) { 403 SET_BIT(client_glx_only, bit); 404 } 405 406 if (known_glx_extensions[i].direct_only) { 407 SET_BIT(direct_glx_only, bit); 408 } 409 } 410 411 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 412 const unsigned bit = known_gl_extensions[i].bit; 413 414 if (known_gl_extensions[i].client_support) { 415 SET_BIT(client_gl_support, bit); 416 } 417 418 if (known_gl_extensions[i].client_only) { 419 SET_BIT(client_gl_only, bit); 420 } 421 } 422 423#if 0 424 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 425 __func__, __LINE__, gl_major, gl_minor); 426#endif 427 } 428} 429 430 431/** 432 * Make sure that per-screen direct-support table is initialized. 433 * 434 * \param psc Pointer to GLX per-screen record. 435 */ 436 437static void 438__glXExtensionsCtrScreen(struct glx_screen * psc) 439{ 440 if (psc->ext_list_first_time) { 441 psc->ext_list_first_time = GL_FALSE; 442 (void) memcpy(psc->direct_support, direct_glx_support, 443 sizeof(direct_glx_support)); 444 } 445} 446 447 448/** 449 * Check if a certain extension is enabled on a given screen. 450 * 451 * \param psc Pointer to GLX per-screen record. 452 * \param bit Bit index in the direct-support table. 453 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 454 * returned. If the extension bit is not enabled or if \c psc is 455 * \c NULL, then \c GL_FALSE is returned. 456 */ 457GLboolean 458__glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit) 459{ 460 GLboolean enabled = GL_FALSE; 461 462 if (psc != NULL) { 463 __glXExtensionsCtr(); 464 __glXExtensionsCtrScreen(psc); 465 enabled = EXT_ENABLED(bit, psc->direct_support); 466 } 467 468 return enabled; 469} 470 471 472/** 473 * Check if a certain extension is enabled in a given context. 474 * 475 */ 476GLboolean 477__glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit) 478{ 479 GLboolean enabled = GL_FALSE; 480 481 if (gc != NULL) { 482 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 483 } 484 485 return enabled; 486} 487 488 489 490/** 491 * Convert a bit-field to a string of supported extensions. 492 */ 493static char * 494__glXGetStringFromTable(const struct extension_info *ext, 495 const unsigned char *supported) 496{ 497 unsigned i; 498 unsigned ext_str_len; 499 char *ext_str; 500 char *point; 501 502 503 ext_str_len = 0; 504 for (i = 0; ext[i].name != NULL; i++) { 505 if (EXT_ENABLED(ext[i].bit, supported)) { 506 ext_str_len += ext[i].name_len + 1; 507 } 508 } 509 510 ext_str = Xmalloc(ext_str_len + 1); 511 if (ext_str != NULL) { 512 point = ext_str; 513 514 for (i = 0; ext[i].name != NULL; i++) { 515 if (EXT_ENABLED(ext[i].bit, supported)) { 516 (void) memcpy(point, ext[i].name, ext[i].name_len); 517 point += ext[i].name_len; 518 519 *point = ' '; 520 point++; 521 } 522 } 523 524 *point = '\0'; 525 } 526 527 return ext_str; 528} 529 530 531/** 532 * Get the string of client library supported extensions. 533 */ 534const char * 535__glXGetClientExtensions(void) 536{ 537 if (__glXGLXClientExtensions == NULL) { 538 __glXExtensionsCtr(); 539 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 540 client_glx_support); 541 } 542 543 return __glXGLXClientExtensions; 544} 545 546 547/** 548 * Calculate the list of application usable extensions. The resulting 549 * string is stored in \c psc->effectiveGLXexts. 550 * 551 * \param psc Pointer to GLX per-screen record. 552 * \param display_is_direct_capable True if the display is capable of 553 * direct rendering. 554 * \param minor_version GLX minor version from the server. 555 */ 556 557void 558__glXCalculateUsableExtensions(struct glx_screen * psc, 559 GLboolean display_is_direct_capable, 560 int minor_version) 561{ 562 unsigned char server_support[8]; 563 unsigned char usable[8]; 564 unsigned i; 565 566 __glXExtensionsCtr(); 567 __glXExtensionsCtrScreen(psc); 568 569 (void) memset(server_support, 0, sizeof(server_support)); 570 __glXProcessServerString(known_glx_extensions, 571 psc->serverGLXexts, server_support); 572 573 574 /* This is a hack. Some servers support GLX 1.3 but don't export 575 * all of the extensions implied by GLX 1.3. If the server claims 576 * support for GLX 1.3, enable support for the extensions that can be 577 * "emulated" as well. 578 */ 579#ifndef GLX_USE_APPLEGL 580 if (minor_version >= 3) { 581 SET_BIT(server_support, EXT_visual_info_bit); 582 SET_BIT(server_support, EXT_visual_rating_bit); 583 SET_BIT(server_support, SGI_make_current_read_bit); 584 SET_BIT(server_support, SGIX_fbconfig_bit); 585 SET_BIT(server_support, SGIX_pbuffer_bit); 586 587 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 588 * extension. However, the only part that is not strictly client-side 589 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 590 * function. 591 */ 592 593 SET_BIT(server_support, EXT_import_context_bit); 594 } 595#endif 596 597 /* An extension is supported if the client-side (i.e., libGL) supports 598 * it and the "server" supports it. In this case that means that either 599 * the true server supports it or it is only for direct-rendering and 600 * the direct rendering driver supports it. 601 * 602 * If the display is not capable of direct rendering, then the extension 603 * is enabled if and only if the client-side library and the server 604 * support it. 605 */ 606 607 if (display_is_direct_capable) { 608 for (i = 0; i < 8; i++) { 609 usable[i] = (client_glx_support[i] & client_glx_only[i]) 610 | (client_glx_support[i] & psc->direct_support[i] & 611 server_support[i]) 612 | (client_glx_support[i] & psc->direct_support[i] & 613 direct_glx_only[i]); 614 } 615 } 616 else { 617 for (i = 0; i < 8; i++) { 618 usable[i] = (client_glx_support[i] & client_glx_only[i]) 619 | (client_glx_support[i] & server_support[i]); 620 } 621 } 622 623 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 624 usable); 625} 626 627 628/** 629 * Calculate the list of application usable extensions. The resulting 630 * string is stored in \c gc->extensions. 631 * 632 * \param gc Pointer to GLX context. 633 * \param server_string Extension string from the server. 634 * \param major_version GL major version from the server. 635 * \param minor_version GL minor version from the server. 636 */ 637 638void 639__glXCalculateUsableGLExtensions(struct glx_context * gc, 640 const char *server_string, 641 int major_version, int minor_version) 642{ 643 unsigned char server_support[__GL_EXT_BYTES]; 644 unsigned char usable[__GL_EXT_BYTES]; 645 unsigned i; 646 647 648 __glXExtensionsCtr(); 649 650 (void) memset(server_support, 0, sizeof(server_support)); 651 __glXProcessServerString(known_gl_extensions, server_string, 652 server_support); 653 654 655 /* Handle lazy servers that don't export all the extensions strings that 656 * are part of the GL core version that they support. 657 */ 658 659 for (i = 0; i < __GL_EXT_BYTES; i++) { 660 if ((known_gl_extensions[i].version_major != 0) 661 && ((major_version > known_gl_extensions[i].version_major) 662 || ((major_version == known_gl_extensions[i].version_major) 663 && (minor_version >= 664 known_gl_extensions[i].version_minor)))) { 665 SET_BIT(server_support, known_gl_extensions[i].bit); 666 } 667 } 668 669 670 /* An extension is supported if the client-side (i.e., libGL) supports 671 * it and the server supports it or the client-side library supports it 672 * and it only needs client-side support. 673 */ 674 675 for (i = 0; i < __GL_EXT_BYTES; i++) { 676 usable[i] = (client_gl_support[i] & client_gl_only[i]) 677 | (client_gl_support[i] & server_support[i]); 678 } 679 680 gc->extensions = (unsigned char *) 681 __glXGetStringFromTable(known_gl_extensions, usable); 682 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 683} 684 685 686/** 687 * Calculates the maximum core GL version that can be supported for indirect 688 * rendering. 689 */ 690void 691__glXGetGLVersion(int *major_version, int *minor_version) 692{ 693 __glXExtensionsCtr(); 694 *major_version = gl_major; 695 *minor_version = gl_minor; 696} 697 698 699/** 700 * Get a string representing the set of extensions supported by the client 701 * library. This is currently only used to send the list of extensions 702 * supported by the client to the server. 703 */ 704char * 705__glXGetClientGLExtensionString(void) 706{ 707 __glXExtensionsCtr(); 708 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 709} 710