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 (at) us.ibm.com> 29 */ 30 31 #include "glxclient.h" 32 #include <X11/extensions/extutil.h> 33 #include <X11/extensions/Xext.h> 34 #include <string.h> 35 #include "glxextensions.h" 36 37 38 #define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8))) 39 #define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8))) 40 #define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0) 41 #define CONCAT(a,b) a ## b 42 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit) 43 #define GL(n) "GL_" # n, 3 + sizeof( # n ) - 1, GL_ ## n ## _bit 44 #define VER(a,b) a, b 45 #define Y 1 46 #define N 0 47 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit )) 48 49 50 struct extension_info 51 { 52 const char *const name; 53 unsigned name_len; 54 55 unsigned char bit; 56 57 /* This is the lowest version of GLX that "requires" this extension. 58 * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and 59 * SGI_make_current_read. If the extension is not required by any known 60 * version of GLX, use 0, 0. 61 */ 62 unsigned char version_major; 63 unsigned char version_minor; 64 unsigned char client_support; 65 unsigned char direct_support; 66 unsigned char client_only; /** Is the extension client-side only? */ 67 unsigned char direct_only; /** Is the extension for direct 68 * contexts only? 69 */ 70 }; 71 72 /* *INDENT-OFF* */ 73 static const struct extension_info known_glx_extensions[] = { 74 { GLX(ARB_create_context), VER(0,0), Y, N, N, N }, 75 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N }, 76 { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N }, 77 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N }, 78 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, 79 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, 80 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, 81 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, 82 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, 83 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 84 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y }, 85 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 86 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N }, 87 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 88 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 89 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 90 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 91 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 92 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 93 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 94 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 95 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 96 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 97 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 98 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 99 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 100 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 101 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N }, 102 { NULL } 103 }; 104 105 static const struct extension_info known_gl_extensions[] = { 106 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 107 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 108 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 109 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 110 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 111 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 112 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 113 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 114 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 115 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 116 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 117 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 118 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 119 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 120 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 121 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 122 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 123 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 124 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 125 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 126 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 127 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 128 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 129 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N }, 130 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 131 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 132 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 133 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 134 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 135 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 136 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 137 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 138 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 139 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 140 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 141 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 142 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 143 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 144 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 145 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 146 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 147 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 148 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 149 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 150 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 151 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 152 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 153 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N }, 154 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 155 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 156 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 157 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 158 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 159 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 160 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 161 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 162 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 163 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 164 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 165 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 166 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 167 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 168 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 169 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 170 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 171 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 172 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 173 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 174 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 175 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 176 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 177 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 178 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 179 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 180 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 181 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 182 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 183 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 184 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 185 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 186 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 187 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 188 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 189 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 190 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 191 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 192 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 193 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 194 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 195 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 196 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 197 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 198 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 199 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 200 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 201 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 202 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 203 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 204 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 205 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 206 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 207 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 208 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 209 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 210 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 211 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 212 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 213 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 214 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 215 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 216 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 217 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 218 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 219 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 220 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 221 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 222 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 223 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 224 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 225 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 226 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 227 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 228 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 229 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 230 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 231 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 232 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 233 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 234 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 235 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 236 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 237 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 238 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 239 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 240 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 241 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 242 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 243 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 244 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 245 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 246 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 247 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 248 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 249 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 250 { NULL } 251 }; 252 /* *INDENT-ON* */ 253 254 255 /* global bit-fields of available extensions and their characteristics */ 256 static unsigned char client_glx_support[8]; 257 static unsigned char client_glx_only[8]; 258 static unsigned char direct_glx_only[8]; 259 static unsigned char client_gl_support[__GL_EXT_BYTES]; 260 static unsigned char client_gl_only[__GL_EXT_BYTES]; 261 262 /** 263 * Bits representing the set of extensions that are enabled by default in all 264 * direct rendering drivers. 265 */ 266 static unsigned char direct_glx_support[8]; 267 268 /** 269 * Highest core GL version that can be supported for indirect rendering. 270 */ 271 static const unsigned gl_major = 1; 272 static const unsigned gl_minor = 4; 273 274 /* client extensions string */ 275 static const char *__glXGLXClientExtensions = NULL; 276 277 static void __glXExtensionsCtr(void); 278 static void __glXExtensionsCtrScreen(struct glx_screen * psc); 279 static void __glXProcessServerString(const struct extension_info *ext, 280 const char *server_string, 281 unsigned char *server_support); 282 283 /** 284 * Set the state of a GLX extension. 285 * 286 * \param name Name of the extension. 287 * \param name_len Length, in characters, of the extension name. 288 * \param state New state (either enabled or disabled) of the extension. 289 * \param supported Table in which the state of the extension is to be set. 290 */ 291 static void 292 set_glx_extension(const struct extension_info *ext, 293 const char *name, unsigned name_len, GLboolean state, 294 unsigned char *supported) 295 { 296 unsigned i; 297 298 299 for (i = 0; ext[i].name != NULL; i++) { 300 if ((name_len == ext[i].name_len) 301 && (strncmp(ext[i].name, name, name_len) == 0)) { 302 if (state) { 303 SET_BIT(supported, ext[i].bit); 304 } 305 else { 306 CLR_BIT(supported, ext[i].bit); 307 } 308 309 return; 310 } 311 } 312 } 313 314 315 #define NUL '\0' 316 #define SEPARATOR ' ' 317 318 /** 319 * Convert the server's extension string to a bit-field. 320 * 321 * \param server_string GLX extension string from the server. 322 * \param server_support Bit-field of supported extensions. 323 * 324 * \note 325 * This function is used to process both GLX and GL extension strings. The 326 * bit-fields used to track each of these have different sizes. Therefore, 327 * the data pointed by \c server_support must be preinitialized to zero. 328 */ 329 static void 330 __glXProcessServerString(const struct extension_info *ext, 331 const char *server_string, 332 unsigned char *server_support) 333 { 334 unsigned base; 335 unsigned len; 336 337 for (base = 0; server_string[base] != NUL; /* empty */ ) { 338 /* Determine the length of the next extension name. 339 */ 340 for (len = 0; (server_string[base + len] != SEPARATOR) 341 && (server_string[base + len] != NUL); len++) { 342 /* empty */ 343 } 344 345 /* Set the bit for the extension in the server_support table. 346 */ 347 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 348 server_support); 349 350 351 /* Advance to the next extension string. This means that we skip 352 * over the previous string and any trialing white-space. 353 */ 354 for (base += len; (server_string[base] == SEPARATOR) 355 && (server_string[base] != NUL); base++) { 356 /* empty */ 357 } 358 } 359 } 360 361 void 362 __glXEnableDirectExtension(struct glx_screen * psc, const char *name) 363 { 364 __glXExtensionsCtr(); 365 __glXExtensionsCtrScreen(psc); 366 367 set_glx_extension(known_glx_extensions, 368 name, strlen(name), GL_TRUE, psc->direct_support); 369 } 370 371 /** 372 * Initialize global extension support tables. 373 */ 374 375 static void 376 __glXExtensionsCtr(void) 377 { 378 unsigned i; 379 static GLboolean ext_list_first_time = GL_TRUE; 380 381 382 if (ext_list_first_time) { 383 ext_list_first_time = GL_FALSE; 384 385 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 386 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 387 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 388 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 389 390 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 391 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 392 393 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 394 const unsigned bit = known_glx_extensions[i].bit; 395 396 if (known_glx_extensions[i].client_support) { 397 SET_BIT(client_glx_support, bit); 398 } 399 400 if (known_glx_extensions[i].direct_support) { 401 SET_BIT(direct_glx_support, bit); 402 } 403 404 if (known_glx_extensions[i].client_only) { 405 SET_BIT(client_glx_only, bit); 406 } 407 408 if (known_glx_extensions[i].direct_only) { 409 SET_BIT(direct_glx_only, bit); 410 } 411 } 412 413 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 414 const unsigned bit = known_gl_extensions[i].bit; 415 416 if (known_gl_extensions[i].client_support) { 417 SET_BIT(client_gl_support, bit); 418 } 419 420 if (known_gl_extensions[i].client_only) { 421 SET_BIT(client_gl_only, bit); 422 } 423 } 424 425 #if 0 426 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 427 __func__, __LINE__, gl_major, gl_minor); 428 #endif 429 } 430 } 431 432 433 /** 434 * Make sure that per-screen direct-support table is initialized. 435 * 436 * \param psc Pointer to GLX per-screen record. 437 */ 438 439 static void 440 __glXExtensionsCtrScreen(struct glx_screen * psc) 441 { 442 if (psc->ext_list_first_time) { 443 psc->ext_list_first_time = GL_FALSE; 444 (void) memcpy(psc->direct_support, direct_glx_support, 445 sizeof(direct_glx_support)); 446 } 447 } 448 449 450 /** 451 * Check if a certain extension is enabled on a given screen. 452 * 453 * \param psc Pointer to GLX per-screen record. 454 * \param bit Bit index in the direct-support table. 455 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 456 * returned. If the extension bit is not enabled or if \c psc is 457 * \c NULL, then \c GL_FALSE is returned. 458 */ 459 GLboolean 460 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit) 461 { 462 GLboolean enabled = GL_FALSE; 463 464 if (psc != NULL) { 465 __glXExtensionsCtr(); 466 __glXExtensionsCtrScreen(psc); 467 enabled = EXT_ENABLED(bit, psc->direct_support); 468 } 469 470 return enabled; 471 } 472 473 474 /** 475 * Check if a certain extension is enabled in a given context. 476 * 477 */ 478 GLboolean 479 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit) 480 { 481 GLboolean enabled = GL_FALSE; 482 483 if (gc != NULL) { 484 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 485 } 486 487 return enabled; 488 } 489 490 491 492 /** 493 * Convert a bit-field to a string of supported extensions. 494 */ 495 static char * 496 __glXGetStringFromTable(const struct extension_info *ext, 497 const unsigned char *supported) 498 { 499 unsigned i; 500 unsigned ext_str_len; 501 char *ext_str; 502 char *point; 503 504 505 ext_str_len = 0; 506 for (i = 0; ext[i].name != NULL; i++) { 507 if (EXT_ENABLED(ext[i].bit, supported)) { 508 ext_str_len += ext[i].name_len + 1; 509 } 510 } 511 512 ext_str = Xmalloc(ext_str_len + 1); 513 if (ext_str != NULL) { 514 point = ext_str; 515 516 for (i = 0; ext[i].name != NULL; i++) { 517 if (EXT_ENABLED(ext[i].bit, supported)) { 518 (void) memcpy(point, ext[i].name, ext[i].name_len); 519 point += ext[i].name_len; 520 521 *point = ' '; 522 point++; 523 } 524 } 525 526 *point = '\0'; 527 } 528 529 return ext_str; 530 } 531 532 533 /** 534 * Get the string of client library supported extensions. 535 */ 536 const char * 537 __glXGetClientExtensions(void) 538 { 539 if (__glXGLXClientExtensions == NULL) { 540 __glXExtensionsCtr(); 541 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 542 client_glx_support); 543 } 544 545 return __glXGLXClientExtensions; 546 } 547 548 549 /** 550 * Calculate the list of application usable extensions. The resulting 551 * string is stored in \c psc->effectiveGLXexts. 552 * 553 * \param psc Pointer to GLX per-screen record. 554 * \param display_is_direct_capable True if the display is capable of 555 * direct rendering. 556 * \param minor_version GLX minor version from the server. 557 */ 558 559 void 560 __glXCalculateUsableExtensions(struct glx_screen * psc, 561 GLboolean display_is_direct_capable, 562 int minor_version) 563 { 564 unsigned char server_support[8]; 565 unsigned char usable[8]; 566 unsigned i; 567 568 __glXExtensionsCtr(); 569 __glXExtensionsCtrScreen(psc); 570 571 (void) memset(server_support, 0, sizeof(server_support)); 572 __glXProcessServerString(known_glx_extensions, 573 psc->serverGLXexts, server_support); 574 575 576 /* This is a hack. Some servers support GLX 1.3 but don't export 577 * all of the extensions implied by GLX 1.3. If the server claims 578 * support for GLX 1.3, enable support for the extensions that can be 579 * "emulated" as well. 580 */ 581 #ifndef GLX_USE_APPLEGL 582 if (minor_version >= 3) { 583 SET_BIT(server_support, EXT_visual_info_bit); 584 SET_BIT(server_support, EXT_visual_rating_bit); 585 SET_BIT(server_support, SGI_make_current_read_bit); 586 SET_BIT(server_support, SGIX_fbconfig_bit); 587 SET_BIT(server_support, SGIX_pbuffer_bit); 588 589 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 590 * extension. However, the only part that is not strictly client-side 591 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 592 * function. 593 */ 594 595 SET_BIT(server_support, EXT_import_context_bit); 596 } 597 #endif 598 599 /* An extension is supported if the client-side (i.e., libGL) supports 600 * it and the "server" supports it. In this case that means that either 601 * the true server supports it or it is only for direct-rendering and 602 * the direct rendering driver supports it. 603 * 604 * If the display is not capable of direct rendering, then the extension 605 * is enabled if and only if the client-side library and the server 606 * support it. 607 */ 608 609 if (display_is_direct_capable) { 610 for (i = 0; i < 8; i++) { 611 usable[i] = (client_glx_support[i] & client_glx_only[i]) 612 | (client_glx_support[i] & psc->direct_support[i] & 613 server_support[i]) 614 | (client_glx_support[i] & psc->direct_support[i] & 615 direct_glx_only[i]); 616 } 617 } 618 else { 619 for (i = 0; i < 8; i++) { 620 usable[i] = (client_glx_support[i] & client_glx_only[i]) 621 | (client_glx_support[i] & server_support[i]); 622 } 623 } 624 625 /* This hack is necessary because GLX_ARB_create_context_profile depends on 626 * server support, but GLX_EXT_create_context_es2_profile is direct-only. 627 * Without this hack, it would be possible to advertise 628 * GLX_EXT_create_context_es2_profile without 629 * GLX_ARB_create_context_profile. That would be a problem. 630 */ 631 if (!IS_SET(server_support, ARB_create_context_profile_bit)) { 632 CLR_BIT(usable, EXT_create_context_es2_profile_bit); 633 } 634 635 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 636 usable); 637 } 638 639 640 /** 641 * Calculate the list of application usable extensions. The resulting 642 * string is stored in \c gc->extensions. 643 * 644 * \param gc Pointer to GLX context. 645 * \param server_string Extension string from the server. 646 * \param major_version GL major version from the server. 647 * \param minor_version GL minor version from the server. 648 */ 649 650 void 651 __glXCalculateUsableGLExtensions(struct glx_context * gc, 652 const char *server_string, 653 int major_version, int minor_version) 654 { 655 unsigned char server_support[__GL_EXT_BYTES]; 656 unsigned char usable[__GL_EXT_BYTES]; 657 unsigned i; 658 659 660 __glXExtensionsCtr(); 661 662 (void) memset(server_support, 0, sizeof(server_support)); 663 __glXProcessServerString(known_gl_extensions, server_string, 664 server_support); 665 666 667 /* Handle lazy servers that don't export all the extensions strings that 668 * are part of the GL core version that they support. 669 */ 670 671 for (i = 0; i < __GL_EXT_BYTES; i++) { 672 if ((known_gl_extensions[i].version_major != 0) 673 && ((major_version > known_gl_extensions[i].version_major) 674 || ((major_version == known_gl_extensions[i].version_major) 675 && (minor_version >= 676 known_gl_extensions[i].version_minor)))) { 677 SET_BIT(server_support, known_gl_extensions[i].bit); 678 } 679 } 680 681 682 /* An extension is supported if the client-side (i.e., libGL) supports 683 * it and the server supports it or the client-side library supports it 684 * and it only needs client-side support. 685 */ 686 687 for (i = 0; i < __GL_EXT_BYTES; i++) { 688 usable[i] = (client_gl_support[i] & client_gl_only[i]) 689 | (client_gl_support[i] & server_support[i]); 690 } 691 692 gc->extensions = (unsigned char *) 693 __glXGetStringFromTable(known_gl_extensions, usable); 694 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 695 } 696 697 698 /** 699 * Calculates the maximum core GL version that can be supported for indirect 700 * rendering. 701 */ 702 void 703 __glXGetGLVersion(int *major_version, int *minor_version) 704 { 705 __glXExtensionsCtr(); 706 *major_version = gl_major; 707 *minor_version = gl_minor; 708 } 709 710 711 /** 712 * Get a string representing the set of extensions supported by the client 713 * library. This is currently only used to send the list of extensions 714 * supported by the client to the server. 715 */ 716 char * 717 __glXGetClientGLExtensionString(void) 718 { 719 __glXExtensionsCtr(); 720 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 721 } 722
