glxextensions.c revision 22266c391fbe17603b15a83d4ccf5fa9455ccf8d
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_get_proc_address), VER(1,4), Y, N, Y, N }, 75 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, 76 { GLX(ARB_render_texture), VER(0,0), N, N, N, N }, 77 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, 78#ifdef GLX_USE_APPLEGL 79 { GLX(EXT_import_context), VER(0,0), N, N, N, N }, 80 { GLX(EXT_visual_info), VER(0,0), N, N, N, N }, 81#else 82 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, 83 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, 84#endif 85 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, 86#ifdef GLX_USE_APPLEGL 87 { GLX(MESA_agp_offset), VER(0,0), N, N, N, N }, /* Deprecated */ 88 { GLX(MESA_copy_sub_buffer), VER(0,0), N, N, N, N }, 89#else 90 { GLX(MESA_agp_offset), VER(0,0), N, N, N, Y }, /* Deprecated */ 91 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 92#endif 93 { GLX(MESA_pixmap_colormap), VER(0,0), N, N, N, N }, /* Deprecated */ 94 { GLX(MESA_release_buffers), VER(0,0), N, N, N, N }, /* Deprecated */ 95#ifdef GLX_USE_APPLEGL 96 { GLX(MESA_swap_control), VER(0,0), N, N, N, N }, 97#else 98 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 99#endif 100 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 101 { GLX(NV_render_depth_texture), VER(0,0), N, N, N, N }, 102 { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N }, 103#ifdef GLX_USE_APPLEGL 104 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, N }, /* Deprecated */ 105 { GLX(OML_swap_method), VER(0,0), N, N, N, N }, 106 { GLX(OML_sync_control), VER(0,0), N, N, N, N }, 107 { GLX(SGI_make_current_read), VER(1,3), N, N, N, N }, 108 { GLX(SGI_swap_control), VER(0,0), N, N, N, N }, 109 { GLX(SGI_video_sync), VER(0,0), N, N, N, N }, 110#else 111 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, Y }, /* Deprecated */ 112 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 113 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 114 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 115 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 116 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 117#endif 118 { GLX(SGIS_blended_overlay), VER(0,0), N, N, N, N }, 119 { GLX(SGIS_color_range), VER(0,0), N, N, N, N }, 120#ifdef GLX_USE_APPLEGL 121 { GLX(SGIS_multisample), VER(0,0), N, N, N, N }, 122#else 123 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 124#endif 125 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 126#ifdef GLX_USE_APPLEGL 127 { GLX(SGIX_pbuffer), VER(1,3), N, N, N, N }, 128#else 129 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 130#endif 131 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 132 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 133#ifdef GLX_USE_APPLEGL 134 { GLX(SGIX_visual_select_group), VER(0,0), N, N, N, N }, 135 { GLX(EXT_texture_from_pixmap), VER(0,0), N, N, N, N }, 136#else 137 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 138 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 139#endif 140 { GLX(INTEL_swap_event), VER(1,4), Y, Y, N, N }, 141 { NULL } 142}; 143 144static const struct extension_info known_gl_extensions[] = { 145 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 146 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 147 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 148 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 149 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 150 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 151 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 152 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 153 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 154 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 155 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 156 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 157 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 158 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 159 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 160 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 161 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 162 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 163 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 164 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 165 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 166 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 167 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 168 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 169 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 170 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 171 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 172 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 173 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 174 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 175 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 176 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 177 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 178 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 179 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 180 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 181 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 182 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 183 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 184 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 185 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 186 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 187 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 188 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 189 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 190 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 191 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 192 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 193 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 194 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 195 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 196 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 197 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 198 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 199 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 200 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 201 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 202 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 203 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 204 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 205 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 206 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 207 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 208 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 209 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 210 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 211 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 212 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 213 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 214 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 215 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 216 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 217 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 218 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 219 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 220 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 221 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 222 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 223 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 224 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 225 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 226 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 227 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 228 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 229 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 230 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 231 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 232 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 233 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 234 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 235 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 236 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 237 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 238 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 239 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 240 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 241 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 242 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 243 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 244 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 245 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 246 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 247 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 248 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 249 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 250 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 251 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 252 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 253 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 254 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 255 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 256 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 257 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 258 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 259 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 260 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 261 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 262 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 263 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 264 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 265 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 266 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 267 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 268 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 269 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 270 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 271 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 272 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 273 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 274 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 275 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 276 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 277 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 278 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 279 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 280 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 281 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 282 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 283 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 284 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 285 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 286 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 287 { NULL } 288}; 289/* *INDENT-ON* */ 290 291 292/* global bit-fields of available extensions and their characteristics */ 293static unsigned char client_glx_support[8]; 294static unsigned char client_glx_only[8]; 295static unsigned char direct_glx_only[8]; 296static unsigned char client_gl_support[__GL_EXT_BYTES]; 297static unsigned char client_gl_only[__GL_EXT_BYTES]; 298 299/** 300 * Bits representing the set of extensions that are enabled by default in all 301 * direct rendering drivers. 302 */ 303static unsigned char direct_glx_support[8]; 304 305/** 306 * Highest core GL version that can be supported for indirect rendering. 307 */ 308static const unsigned gl_major = 1; 309static const unsigned gl_minor = 4; 310 311/* client extensions string */ 312static const char *__glXGLXClientExtensions = NULL; 313 314static void __glXExtensionsCtr(void); 315static void __glXExtensionsCtrScreen(__GLXscreenConfigs * psc); 316static void __glXProcessServerString(const struct extension_info *ext, 317 const char *server_string, 318 unsigned char *server_support); 319 320/** 321 * Set the state of a GLX extension. 322 * 323 * \param name Name of the extension. 324 * \param name_len Length, in characters, of the extension name. 325 * \param state New state (either enabled or disabled) of the extension. 326 * \param supported Table in which the state of the extension is to be set. 327 */ 328static void 329set_glx_extension(const struct extension_info *ext, 330 const char *name, unsigned name_len, GLboolean state, 331 unsigned char *supported) 332{ 333 unsigned i; 334 335 336 for (i = 0; ext[i].name != NULL; i++) { 337 if ((name_len == ext[i].name_len) 338 && (strncmp(ext[i].name, name, name_len) == 0)) { 339 if (state) { 340 SET_BIT(supported, ext[i].bit); 341 } 342 else { 343 CLR_BIT(supported, ext[i].bit); 344 } 345 346 return; 347 } 348 } 349} 350 351 352#define NUL '\0' 353#define SEPARATOR ' ' 354 355/** 356 * Convert the server's extension string to a bit-field. 357 * 358 * \param server_string GLX extension string from the server. 359 * \param server_support Bit-field of supported extensions. 360 * 361 * \note 362 * This function is used to process both GLX and GL extension strings. The 363 * bit-fields used to track each of these have different sizes. Therefore, 364 * the data pointed by \c server_support must be preinitialized to zero. 365 */ 366static void 367__glXProcessServerString(const struct extension_info *ext, 368 const char *server_string, 369 unsigned char *server_support) 370{ 371 unsigned base; 372 unsigned len; 373 374 for (base = 0; server_string[base] != NUL; /* empty */ ) { 375 /* Determine the length of the next extension name. 376 */ 377 for (len = 0; (server_string[base + len] != SEPARATOR) 378 && (server_string[base + len] != NUL); len++) { 379 /* empty */ 380 } 381 382 /* Set the bit for the extension in the server_support table. 383 */ 384 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 385 server_support); 386 387 388 /* Advance to the next extension string. This means that we skip 389 * over the previous string and any trialing white-space. 390 */ 391 for (base += len; (server_string[base] == SEPARATOR) 392 && (server_string[base] != NUL); base++) { 393 /* empty */ 394 } 395 } 396} 397 398void 399__glXEnableDirectExtension(__GLXscreenConfigs * psc, const char *name) 400{ 401 __glXExtensionsCtr(); 402 __glXExtensionsCtrScreen(psc); 403 404 set_glx_extension(known_glx_extensions, 405 name, strlen(name), GL_TRUE, psc->direct_support); 406} 407 408/** 409 * Initialize global extension support tables. 410 */ 411 412static void 413__glXExtensionsCtr(void) 414{ 415 unsigned i; 416 static GLboolean ext_list_first_time = GL_TRUE; 417 418 419 if (ext_list_first_time) { 420 ext_list_first_time = GL_FALSE; 421 422 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 423 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 424 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 425 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 426 427 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 428 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 429 430 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 431 const unsigned bit = known_glx_extensions[i].bit; 432 433 if (known_glx_extensions[i].client_support) { 434 SET_BIT(client_glx_support, bit); 435 } 436 437 if (known_glx_extensions[i].direct_support) { 438 SET_BIT(direct_glx_support, bit); 439 } 440 441 if (known_glx_extensions[i].client_only) { 442 SET_BIT(client_glx_only, bit); 443 } 444 445 if (known_glx_extensions[i].direct_only) { 446 SET_BIT(direct_glx_only, bit); 447 } 448 } 449 450 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 451 const unsigned bit = known_gl_extensions[i].bit; 452 453 if (known_gl_extensions[i].client_support) { 454 SET_BIT(client_gl_support, bit); 455 } 456 457 if (known_gl_extensions[i].client_only) { 458 SET_BIT(client_gl_only, bit); 459 } 460 } 461 462#if 0 463 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 464 __func__, __LINE__, gl_major, gl_minor); 465#endif 466 } 467} 468 469 470/** 471 * Make sure that per-screen direct-support table is initialized. 472 * 473 * \param psc Pointer to GLX per-screen record. 474 */ 475 476static void 477__glXExtensionsCtrScreen(__GLXscreenConfigs * psc) 478{ 479 if (psc->ext_list_first_time) { 480 psc->ext_list_first_time = GL_FALSE; 481 (void) memcpy(psc->direct_support, direct_glx_support, 482 sizeof(direct_glx_support)); 483 } 484} 485 486 487/** 488 * Check if a certain extension is enabled on a given screen. 489 * 490 * \param psc Pointer to GLX per-screen record. 491 * \param bit Bit index in the direct-support table. 492 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 493 * returned. If the extension bit is not enabled or if \c psc is 494 * \c NULL, then \c GL_FALSE is returned. 495 */ 496GLboolean 497__glXExtensionBitIsEnabled(__GLXscreenConfigs * psc, unsigned bit) 498{ 499 GLboolean enabled = GL_FALSE; 500 501 if (psc != NULL) { 502 __glXExtensionsCtr(); 503 __glXExtensionsCtrScreen(psc); 504 enabled = EXT_ENABLED(bit, psc->direct_support); 505 } 506 507 return enabled; 508} 509 510 511/** 512 * Check if a certain extension is enabled in a given context. 513 * 514 */ 515GLboolean 516__glExtensionBitIsEnabled(const __GLXcontext * gc, unsigned bit) 517{ 518 GLboolean enabled = GL_FALSE; 519 520 if (gc != NULL) { 521 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 522 } 523 524 return enabled; 525} 526 527 528 529/** 530 * Convert a bit-field to a string of supported extensions. 531 */ 532static char * 533__glXGetStringFromTable(const struct extension_info *ext, 534 const unsigned char *supported) 535{ 536 unsigned i; 537 unsigned ext_str_len; 538 char *ext_str; 539 char *point; 540 541 542 ext_str_len = 0; 543 for (i = 0; ext[i].name != NULL; i++) { 544 if (EXT_ENABLED(ext[i].bit, supported)) { 545 ext_str_len += ext[i].name_len + 1; 546 } 547 } 548 549 ext_str = Xmalloc(ext_str_len + 1); 550 if (ext_str != NULL) { 551 point = ext_str; 552 553 for (i = 0; ext[i].name != NULL; i++) { 554 if (EXT_ENABLED(ext[i].bit, supported)) { 555 (void) memcpy(point, ext[i].name, ext[i].name_len); 556 point += ext[i].name_len; 557 558 *point = ' '; 559 point++; 560 } 561 } 562 563 *point = '\0'; 564 } 565 566 return ext_str; 567} 568 569 570/** 571 * Get the string of client library supported extensions. 572 */ 573const char * 574__glXGetClientExtensions(void) 575{ 576 if (__glXGLXClientExtensions == NULL) { 577 __glXExtensionsCtr(); 578 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 579 client_glx_support); 580 } 581 582 return __glXGLXClientExtensions; 583} 584 585 586/** 587 * Calculate the list of application usable extensions. The resulting 588 * string is stored in \c psc->effectiveGLXexts. 589 * 590 * \param psc Pointer to GLX per-screen record. 591 * \param display_is_direct_capable True if the display is capable of 592 * direct rendering. 593 * \param minor_version GLX minor version from the server. 594 */ 595 596void 597__glXCalculateUsableExtensions(__GLXscreenConfigs * psc, 598 GLboolean display_is_direct_capable, 599 int minor_version) 600{ 601 unsigned char server_support[8]; 602 unsigned char usable[8]; 603 unsigned i; 604 605 __glXExtensionsCtr(); 606 __glXExtensionsCtrScreen(psc); 607 608 (void) memset(server_support, 0, sizeof(server_support)); 609 __glXProcessServerString(known_glx_extensions, 610 psc->serverGLXexts, server_support); 611 612 613 /* This is a hack. Some servers support GLX 1.3 but don't export 614 * all of the extensions implied by GLX 1.3. If the server claims 615 * support for GLX 1.3, enable support for the extensions that can be 616 * "emulated" as well. 617 */ 618 619 if (minor_version >= 3) { 620 SET_BIT(server_support, EXT_visual_info_bit); 621 SET_BIT(server_support, EXT_visual_rating_bit); 622 SET_BIT(server_support, SGI_make_current_read_bit); 623 SET_BIT(server_support, SGIX_fbconfig_bit); 624 SET_BIT(server_support, SGIX_pbuffer_bit); 625 626 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 627 * extension. However, the only part that is not strictly client-side 628 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 629 * function. 630 */ 631 632 SET_BIT(server_support, EXT_import_context_bit); 633 } 634 635 636 /* An extension is supported if the client-side (i.e., libGL) supports 637 * it and the "server" supports it. In this case that means that either 638 * the true server supports it or it is only for direct-rendering and 639 * the direct rendering driver supports it. 640 * 641 * If the display is not capable of direct rendering, then the extension 642 * is enabled if and only if the client-side library and the server 643 * support it. 644 */ 645 646 if (display_is_direct_capable) { 647 for (i = 0; i < 8; i++) { 648 usable[i] = (client_glx_support[i] & client_glx_only[i]) 649 | (client_glx_support[i] & psc->direct_support[i] & 650 server_support[i]) 651 | (client_glx_support[i] & psc->direct_support[i] & 652 direct_glx_only[i]); 653 } 654 } 655 else { 656 for (i = 0; i < 8; i++) { 657 usable[i] = (client_glx_support[i] & client_glx_only[i]) 658 | (client_glx_support[i] & server_support[i]); 659 } 660 } 661 662 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 663 usable); 664} 665 666 667/** 668 * Calculate the list of application usable extensions. The resulting 669 * string is stored in \c gc->extensions. 670 * 671 * \param gc Pointer to GLX context. 672 * \param server_string Extension string from the server. 673 * \param major_version GL major version from the server. 674 * \param minor_version GL minor version from the server. 675 */ 676 677void 678__glXCalculateUsableGLExtensions(__GLXcontext * gc, 679 const char *server_string, 680 int major_version, int minor_version) 681{ 682 unsigned char server_support[__GL_EXT_BYTES]; 683 unsigned char usable[__GL_EXT_BYTES]; 684 unsigned i; 685 686 687 __glXExtensionsCtr(); 688 689 (void) memset(server_support, 0, sizeof(server_support)); 690 __glXProcessServerString(known_gl_extensions, server_string, 691 server_support); 692 693 694 /* Handle lazy servers that don't export all the extensions strings that 695 * are part of the GL core version that they support. 696 */ 697 698 for (i = 0; i < __GL_EXT_BYTES; i++) { 699 if ((known_gl_extensions[i].version_major != 0) 700 && ((major_version > known_gl_extensions[i].version_major) 701 || ((major_version == known_gl_extensions[i].version_major) 702 && (minor_version >= 703 known_gl_extensions[i].version_minor)))) { 704 SET_BIT(server_support, known_gl_extensions[i].bit); 705 } 706 } 707 708 709 /* An extension is supported if the client-side (i.e., libGL) supports 710 * it and the server supports it or the client-side library supports it 711 * and it only needs client-side support. 712 */ 713 714 for (i = 0; i < __GL_EXT_BYTES; i++) { 715 usable[i] = (client_gl_support[i] & client_gl_only[i]) 716 | (client_gl_support[i] & server_support[i]); 717 } 718 719 gc->extensions = (unsigned char *) 720 __glXGetStringFromTable(known_gl_extensions, usable); 721 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 722} 723 724 725/** 726 * Calculates the maximum core GL version that can be supported for indirect 727 * rendering. 728 */ 729void 730__glXGetGLVersion(int *major_version, int *minor_version) 731{ 732 __glXExtensionsCtr(); 733 *major_version = gl_major; 734 *minor_version = gl_minor; 735} 736 737 738/** 739 * Get a string representing the set of extensions supported by the client 740 * library. This is currently only used to send the list of extensions 741 * supported by the client to the server. 742 */ 743char * 744__glXGetClientGLExtensionString(void) 745{ 746 __glXExtensionsCtr(); 747 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 748} 749