glxextensions.c revision 4becf676e0b09b421821b6895251549ec98d4e5d
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#ifdef HAVE_XCB_GLX_CREATE_CONTEXT 75 { GLX(ARB_create_context), VER(0,0), Y, N, N, N }, 76 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N }, 77#else 78 { GLX(ARB_create_context), VER(0,0), N, N, N, N }, 79 { GLX(ARB_create_context_profile), VER(0,0), N, N, N, N }, 80#endif 81 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N }, 82 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, 83 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, 84 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, 85 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, 86 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, 87 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 88#ifdef HAVE_XCB_GLX_CREATE_CONTEXT 89 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y }, 90#else 91 { GLX(EXT_create_context_es2_profile), VER(0,0), N, N, N, N }, 92#endif 93 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 94 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N }, 95 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 96 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 97 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 98 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 99 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 100 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 101 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 102 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 103 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 104 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 105 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 106 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 107 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 108 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 109 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N }, 110 { NULL } 111}; 112 113static const struct extension_info known_gl_extensions[] = { 114 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 115 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 116 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 117 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 118 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 119 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 120 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 121 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 122 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 123 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 124 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 125 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 126 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 127 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 128 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 129 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 130 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 131 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 132 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 133 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 134 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 135 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 136 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 137 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N }, 138 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 139 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 140 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 141 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 142 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 143 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 144 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 145 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 146 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 147 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 148 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 149 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 150 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 151 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 152 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 153 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 154 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 155 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 156 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 157 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 158 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 159 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 160 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 161 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N }, 162 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 163 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 164 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 165 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 166 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 167 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 168 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 169 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 170 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 171 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 172 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 173 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 174 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 175 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 176 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 177 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 178 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 179 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 180 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 181 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 182 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 183 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 184 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 185 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 186 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 187 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 188 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 189 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 190 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 191 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 192 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 193 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 194 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 195 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 196 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 197 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 198 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 199 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 200 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 201 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 202 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 203 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 204 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 205 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 206 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 207 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 208 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 209 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 210 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 211 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 212 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 213 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 214 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 215 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 216 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 217 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 218 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 219 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 220 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 221 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 222 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 223 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 224 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 225 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 226 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 227 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 228 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 229 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 230 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 231 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 232 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 233 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 234 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 235 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 236 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 237 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 238 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 239 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 240 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 241 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 242 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 243 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 244 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 245 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 246 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 247 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 248 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 249 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 250 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 251 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 252 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 253 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 254 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 255 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 256 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 257 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 258 { NULL } 259}; 260/* *INDENT-ON* */ 261 262 263/* global bit-fields of available extensions and their characteristics */ 264static unsigned char client_glx_support[8]; 265static unsigned char client_glx_only[8]; 266static unsigned char direct_glx_only[8]; 267static unsigned char client_gl_support[__GL_EXT_BYTES]; 268static unsigned char client_gl_only[__GL_EXT_BYTES]; 269 270/** 271 * Bits representing the set of extensions that are enabled by default in all 272 * direct rendering drivers. 273 */ 274static unsigned char direct_glx_support[8]; 275 276/** 277 * Highest core GL version that can be supported for indirect rendering. 278 */ 279static const unsigned gl_major = 1; 280static const unsigned gl_minor = 4; 281 282/* client extensions string */ 283static const char *__glXGLXClientExtensions = NULL; 284 285static void __glXExtensionsCtr(void); 286static void __glXExtensionsCtrScreen(struct glx_screen * psc); 287static void __glXProcessServerString(const struct extension_info *ext, 288 const char *server_string, 289 unsigned char *server_support); 290 291/** 292 * Set the state of a GLX extension. 293 * 294 * \param name Name of the extension. 295 * \param name_len Length, in characters, of the extension name. 296 * \param state New state (either enabled or disabled) of the extension. 297 * \param supported Table in which the state of the extension is to be set. 298 */ 299static void 300set_glx_extension(const struct extension_info *ext, 301 const char *name, unsigned name_len, GLboolean state, 302 unsigned char *supported) 303{ 304 unsigned i; 305 306 307 for (i = 0; ext[i].name != NULL; i++) { 308 if ((name_len == ext[i].name_len) 309 && (strncmp(ext[i].name, name, name_len) == 0)) { 310 if (state) { 311 SET_BIT(supported, ext[i].bit); 312 } 313 else { 314 CLR_BIT(supported, ext[i].bit); 315 } 316 317 return; 318 } 319 } 320} 321 322 323#define NUL '\0' 324#define SEPARATOR ' ' 325 326/** 327 * Convert the server's extension string to a bit-field. 328 * 329 * \param server_string GLX extension string from the server. 330 * \param server_support Bit-field of supported extensions. 331 * 332 * \note 333 * This function is used to process both GLX and GL extension strings. The 334 * bit-fields used to track each of these have different sizes. Therefore, 335 * the data pointed by \c server_support must be preinitialized to zero. 336 */ 337static void 338__glXProcessServerString(const struct extension_info *ext, 339 const char *server_string, 340 unsigned char *server_support) 341{ 342 unsigned base; 343 unsigned len; 344 345 for (base = 0; server_string[base] != NUL; /* empty */ ) { 346 /* Determine the length of the next extension name. 347 */ 348 for (len = 0; (server_string[base + len] != SEPARATOR) 349 && (server_string[base + len] != NUL); len++) { 350 /* empty */ 351 } 352 353 /* Set the bit for the extension in the server_support table. 354 */ 355 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 356 server_support); 357 358 359 /* Advance to the next extension string. This means that we skip 360 * over the previous string and any trialing white-space. 361 */ 362 for (base += len; (server_string[base] == SEPARATOR) 363 && (server_string[base] != NUL); base++) { 364 /* empty */ 365 } 366 } 367} 368 369void 370__glXEnableDirectExtension(struct glx_screen * psc, const char *name) 371{ 372 __glXExtensionsCtr(); 373 __glXExtensionsCtrScreen(psc); 374 375 set_glx_extension(known_glx_extensions, 376 name, strlen(name), GL_TRUE, psc->direct_support); 377} 378 379/** 380 * Initialize global extension support tables. 381 */ 382 383static void 384__glXExtensionsCtr(void) 385{ 386 unsigned i; 387 static GLboolean ext_list_first_time = GL_TRUE; 388 389 390 if (ext_list_first_time) { 391 ext_list_first_time = GL_FALSE; 392 393 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 394 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 395 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 396 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 397 398 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 399 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 400 401 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 402 const unsigned bit = known_glx_extensions[i].bit; 403 404 if (known_glx_extensions[i].client_support) { 405 SET_BIT(client_glx_support, bit); 406 } 407 408 if (known_glx_extensions[i].direct_support) { 409 SET_BIT(direct_glx_support, bit); 410 } 411 412 if (known_glx_extensions[i].client_only) { 413 SET_BIT(client_glx_only, bit); 414 } 415 416 if (known_glx_extensions[i].direct_only) { 417 SET_BIT(direct_glx_only, bit); 418 } 419 } 420 421 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 422 const unsigned bit = known_gl_extensions[i].bit; 423 424 if (known_gl_extensions[i].client_support) { 425 SET_BIT(client_gl_support, bit); 426 } 427 428 if (known_gl_extensions[i].client_only) { 429 SET_BIT(client_gl_only, bit); 430 } 431 } 432 433#if 0 434 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 435 __func__, __LINE__, gl_major, gl_minor); 436#endif 437 } 438} 439 440 441/** 442 * Make sure that per-screen direct-support table is initialized. 443 * 444 * \param psc Pointer to GLX per-screen record. 445 */ 446 447static void 448__glXExtensionsCtrScreen(struct glx_screen * psc) 449{ 450 if (psc->ext_list_first_time) { 451 psc->ext_list_first_time = GL_FALSE; 452 (void) memcpy(psc->direct_support, direct_glx_support, 453 sizeof(direct_glx_support)); 454 } 455} 456 457 458/** 459 * Check if a certain extension is enabled on a given screen. 460 * 461 * \param psc Pointer to GLX per-screen record. 462 * \param bit Bit index in the direct-support table. 463 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 464 * returned. If the extension bit is not enabled or if \c psc is 465 * \c NULL, then \c GL_FALSE is returned. 466 */ 467GLboolean 468__glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit) 469{ 470 GLboolean enabled = GL_FALSE; 471 472 if (psc != NULL) { 473 __glXExtensionsCtr(); 474 __glXExtensionsCtrScreen(psc); 475 enabled = EXT_ENABLED(bit, psc->direct_support); 476 } 477 478 return enabled; 479} 480 481 482/** 483 * Check if a certain extension is enabled in a given context. 484 * 485 */ 486GLboolean 487__glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit) 488{ 489 GLboolean enabled = GL_FALSE; 490 491 if (gc != NULL) { 492 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 493 } 494 495 return enabled; 496} 497 498 499 500/** 501 * Convert a bit-field to a string of supported extensions. 502 */ 503static char * 504__glXGetStringFromTable(const struct extension_info *ext, 505 const unsigned char *supported) 506{ 507 unsigned i; 508 unsigned ext_str_len; 509 char *ext_str; 510 char *point; 511 512 513 ext_str_len = 0; 514 for (i = 0; ext[i].name != NULL; i++) { 515 if (EXT_ENABLED(ext[i].bit, supported)) { 516 ext_str_len += ext[i].name_len + 1; 517 } 518 } 519 520 ext_str = Xmalloc(ext_str_len + 1); 521 if (ext_str != NULL) { 522 point = ext_str; 523 524 for (i = 0; ext[i].name != NULL; i++) { 525 if (EXT_ENABLED(ext[i].bit, supported)) { 526 (void) memcpy(point, ext[i].name, ext[i].name_len); 527 point += ext[i].name_len; 528 529 *point = ' '; 530 point++; 531 } 532 } 533 534 *point = '\0'; 535 } 536 537 return ext_str; 538} 539 540 541/** 542 * Get the string of client library supported extensions. 543 */ 544const char * 545__glXGetClientExtensions(void) 546{ 547 if (__glXGLXClientExtensions == NULL) { 548 __glXExtensionsCtr(); 549 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 550 client_glx_support); 551 } 552 553 return __glXGLXClientExtensions; 554} 555 556 557/** 558 * Calculate the list of application usable extensions. The resulting 559 * string is stored in \c psc->effectiveGLXexts. 560 * 561 * \param psc Pointer to GLX per-screen record. 562 * \param display_is_direct_capable True if the display is capable of 563 * direct rendering. 564 * \param minor_version GLX minor version from the server. 565 */ 566 567void 568__glXCalculateUsableExtensions(struct glx_screen * psc, 569 GLboolean display_is_direct_capable, 570 int minor_version) 571{ 572 unsigned char server_support[8]; 573 unsigned char usable[8]; 574 unsigned i; 575 576 __glXExtensionsCtr(); 577 __glXExtensionsCtrScreen(psc); 578 579 (void) memset(server_support, 0, sizeof(server_support)); 580 __glXProcessServerString(known_glx_extensions, 581 psc->serverGLXexts, server_support); 582 583 584 /* This is a hack. Some servers support GLX 1.3 but don't export 585 * all of the extensions implied by GLX 1.3. If the server claims 586 * support for GLX 1.3, enable support for the extensions that can be 587 * "emulated" as well. 588 */ 589#ifndef GLX_USE_APPLEGL 590 if (minor_version >= 3) { 591 SET_BIT(server_support, EXT_visual_info_bit); 592 SET_BIT(server_support, EXT_visual_rating_bit); 593 SET_BIT(server_support, SGI_make_current_read_bit); 594 SET_BIT(server_support, SGIX_fbconfig_bit); 595 SET_BIT(server_support, SGIX_pbuffer_bit); 596 597 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 598 * extension. However, the only part that is not strictly client-side 599 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 600 * function. 601 */ 602 603 SET_BIT(server_support, EXT_import_context_bit); 604 } 605#endif 606 607 /* An extension is supported if the client-side (i.e., libGL) supports 608 * it and the "server" supports it. In this case that means that either 609 * the true server supports it or it is only for direct-rendering and 610 * the direct rendering driver supports it. 611 * 612 * If the display is not capable of direct rendering, then the extension 613 * is enabled if and only if the client-side library and the server 614 * support it. 615 */ 616 617 if (display_is_direct_capable) { 618 for (i = 0; i < 8; i++) { 619 usable[i] = (client_glx_support[i] & client_glx_only[i]) 620 | (client_glx_support[i] & psc->direct_support[i] & 621 server_support[i]) 622 | (client_glx_support[i] & psc->direct_support[i] & 623 direct_glx_only[i]); 624 } 625 } 626 else { 627 for (i = 0; i < 8; i++) { 628 usable[i] = (client_glx_support[i] & client_glx_only[i]) 629 | (client_glx_support[i] & server_support[i]); 630 } 631 } 632 633 /* This hack is necessary because GLX_ARB_create_context_profile depends on 634 * server support, but GLX_EXT_create_context_es2_profile is direct-only. 635 * Without this hack, it would be possible to advertise 636 * GLX_EXT_create_context_es2_profile without 637 * GLX_ARB_create_context_profile. That would be a problem. 638 */ 639 if (!IS_SET(server_support, ARB_create_context_profile_bit)) { 640 CLR_BIT(usable, EXT_create_context_es2_profile_bit); 641 } 642 643 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 644 usable); 645} 646 647 648/** 649 * Calculate the list of application usable extensions. The resulting 650 * string is stored in \c gc->extensions. 651 * 652 * \param gc Pointer to GLX context. 653 * \param server_string Extension string from the server. 654 * \param major_version GL major version from the server. 655 * \param minor_version GL minor version from the server. 656 */ 657 658void 659__glXCalculateUsableGLExtensions(struct glx_context * gc, 660 const char *server_string, 661 int major_version, int minor_version) 662{ 663 unsigned char server_support[__GL_EXT_BYTES]; 664 unsigned char usable[__GL_EXT_BYTES]; 665 unsigned i; 666 667 668 __glXExtensionsCtr(); 669 670 (void) memset(server_support, 0, sizeof(server_support)); 671 __glXProcessServerString(known_gl_extensions, server_string, 672 server_support); 673 674 675 /* Handle lazy servers that don't export all the extensions strings that 676 * are part of the GL core version that they support. 677 */ 678 679 for (i = 0; i < __GL_EXT_BYTES; i++) { 680 if ((known_gl_extensions[i].version_major != 0) 681 && ((major_version > known_gl_extensions[i].version_major) 682 || ((major_version == known_gl_extensions[i].version_major) 683 && (minor_version >= 684 known_gl_extensions[i].version_minor)))) { 685 SET_BIT(server_support, known_gl_extensions[i].bit); 686 } 687 } 688 689 690 /* An extension is supported if the client-side (i.e., libGL) supports 691 * it and the server supports it or the client-side library supports it 692 * and it only needs client-side support. 693 */ 694 695 for (i = 0; i < __GL_EXT_BYTES; i++) { 696 usable[i] = (client_gl_support[i] & client_gl_only[i]) 697 | (client_gl_support[i] & server_support[i]); 698 } 699 700 gc->extensions = (unsigned char *) 701 __glXGetStringFromTable(known_gl_extensions, usable); 702 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 703} 704 705 706/** 707 * Calculates the maximum core GL version that can be supported for indirect 708 * rendering. 709 */ 710void 711__glXGetGLVersion(int *major_version, int *minor_version) 712{ 713 __glXExtensionsCtr(); 714 *major_version = gl_major; 715 *minor_version = gl_minor; 716} 717 718 719/** 720 * Get a string representing the set of extensions supported by the client 721 * library. This is currently only used to send the list of extensions 722 * supported by the client to the server. 723 */ 724char * 725__glXGetClientGLExtensionString(void) 726{ 727 __glXExtensionsCtr(); 728 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 729} 730