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 65 /** 66 * The client (i.e., libGL) supports this extension. 67 * 68 * Except during bring up, all extensions should have this set to Y. There 69 * are a few cases of extensions that have partial (or speculative) 70 * support, but these are rare. There also shouldn't be any new ones 71 * added. 72 * 73 * Generally, extensions require server support and ::client_support to be 74 * enabled. If the display is capable of direct rendering, 75 * ::direct_support is also required. 76 * 77 * \sa ::client_only 78 */ 79 unsigned char client_support; 80 81 /** 82 * The direct-renderer (e.g., i965_dri.so) supports this extension. 83 * 84 * For cases where all of the infrastructure to support the extension is a 85 * required part of the loader/driver interface, this can default to Y. 86 * For most cases, extended functionality, usually in the form of DRI2 87 * extensions, is necessary to support the extension. The loader will set 88 * the flag true if all the requirements are met. 89 * 90 * If the display is capable of direct rendering, ::direct_support is 91 * required for the extension to be enabled. 92 */ 93 unsigned char direct_support; 94 95 /** 96 * The extension depends only on client support. 97 * 98 * This is for extensions like GLX_ARB_get_proc_address that are contained 99 * entirely in the client library. There is no dependency on the server or 100 * the direct-renderer. 101 * 102 * These extensions will be enabled if ::client_support is set. 103 * 104 * \note 105 * An extension \b cannot be both client-only and direct-only because being 106 * direct-only implies a dependency on the direct renderer. 107 * 108 * \sa ::client_support, ::direct_only 109 */ 110 unsigned char client_only; 111 112 /** 113 * The extension only functions with direct-rendering contexts 114 * 115 * The extension has no GLX protocol, and, therefore, no explicit 116 * dependency on the server. The functionality is contained entirely in 117 * the client library and the direct renderer. A few of the swap-related 118 * extensions are intended to behave this way. 119 * 120 * These extensions will be enabled if both ::client_support and 121 * ::direct_support are set. 122 * 123 * \note 124 * An extension \b cannot be both client-only and direct-only because being 125 * client-only implies that all functionality is outside the 126 * direct-renderer. 127 * 128 * \sa ::direct_support, ::client_only 129 */ 130 unsigned char direct_only; 131 }; 132 133 /* *INDENT-OFF* */ 134 static const struct extension_info known_glx_extensions[] = { 135 { GLX(ARB_context_flush_control), VER(0,0), Y, N, N, N }, 136 { GLX(ARB_create_context), VER(0,0), Y, N, N, N }, 137 { GLX(ARB_create_context_profile), VER(0,0), Y, N, N, N }, 138 { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N }, 139 { GLX(ARB_fbconfig_float), VER(0,0), Y, Y, N, N }, 140 { GLX(ARB_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 141 { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N }, 142 { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, 143 { GLX(EXT_buffer_age), VER(0,0), Y, N, N, Y }, 144 { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, N }, 145 { GLX(EXT_create_context_es_profile), VER(0,0), Y, N, N, N }, 146 { GLX(EXT_fbconfig_packed_float), VER(0,0), Y, Y, N, N }, 147 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 148 { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, 149 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 150 { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, 151 { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, 152 { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, 153 { GLX(INTEL_swap_event), VER(0,0), Y, N, N, N }, 154 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 155 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N }, 156 { GLX(MESA_query_renderer), VER(0,0), Y, N, N, Y }, 157 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 158 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 159 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 160 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 161 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 162 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 163 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 164 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 165 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 166 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 167 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 168 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 169 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 170 { NULL } 171 }; 172 173 static const struct extension_info known_gl_extensions[] = { 174 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 175 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 176 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 177 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 178 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 179 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 180 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 181 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 182 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 183 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 184 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 185 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 186 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 187 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 188 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 189 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 190 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 191 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 192 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 193 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 194 { GL(ARB_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 195 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 196 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 197 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 198 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N }, 199 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 200 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 201 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 202 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 203 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 204 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 205 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 206 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 207 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 208 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 209 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 210 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 211 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 212 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 213 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 214 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 215 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 216 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 217 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 218 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 219 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 220 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 221 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 222 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N }, 223 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 224 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 225 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 226 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 227 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 228 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 229 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 230 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 231 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 232 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 233 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 234 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 235 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 236 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 237 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 238 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 239 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 240 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 241 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 242 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 243 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 244 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 245 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 246 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 247 { GL(EXT_texture_integer), VER(0,0), Y, N, N, N }, 248 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 249 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 250 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 251 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 252 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 253 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 254 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 255 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 256 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 257 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 258 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 259 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 260 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 261 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 262 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 263 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 264 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 265 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 266 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 267 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 268 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 269 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 270 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 271 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 272 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 273 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 274 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 275 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 276 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 277 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 278 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 279 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 280 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 281 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 282 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 283 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 284 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 285 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 286 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 287 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 288 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 289 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 290 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 291 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 292 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 293 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 294 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 295 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 296 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 297 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 298 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 299 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 300 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 301 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 302 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 303 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 304 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 305 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 306 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 307 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 308 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 309 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 310 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 311 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 312 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 313 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 314 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 315 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 316 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 317 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 318 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 319 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 320 { NULL } 321 }; 322 /* *INDENT-ON* */ 323 324 325 /* global bit-fields of available extensions and their characteristics */ 326 static unsigned char client_glx_support[8]; 327 static unsigned char client_glx_only[8]; 328 static unsigned char direct_glx_only[8]; 329 static unsigned char client_gl_support[__GL_EXT_BYTES]; 330 static unsigned char client_gl_only[__GL_EXT_BYTES]; 331 332 /** 333 * Bits representing the set of extensions that are enabled by default in all 334 * direct rendering drivers. 335 */ 336 static unsigned char direct_glx_support[8]; 337 338 /** 339 * Highest core GL version that can be supported for indirect rendering. 340 */ 341 static const unsigned gl_major = 1; 342 static const unsigned gl_minor = 4; 343 344 /* client extensions string */ 345 static const char *__glXGLXClientExtensions = NULL; 346 347 static void __glXExtensionsCtr(void); 348 static void __glXExtensionsCtrScreen(struct glx_screen * psc); 349 static void __glXProcessServerString(const struct extension_info *ext, 350 const char *server_string, 351 unsigned char *server_support); 352 353 /** 354 * Set the state of a GLX extension. 355 * 356 * \param name Name of the extension. 357 * \param name_len Length, in characters, of the extension name. 358 * \param state New state (either enabled or disabled) of the extension. 359 * \param supported Table in which the state of the extension is to be set. 360 */ 361 static void 362 set_glx_extension(const struct extension_info *ext, 363 const char *name, unsigned name_len, GLboolean state, 364 unsigned char *supported) 365 { 366 unsigned i; 367 368 369 for (i = 0; ext[i].name != NULL; i++) { 370 if ((name_len == ext[i].name_len) 371 && (strncmp(ext[i].name, name, name_len) == 0)) { 372 if (state) { 373 SET_BIT(supported, ext[i].bit); 374 } 375 else { 376 CLR_BIT(supported, ext[i].bit); 377 } 378 379 return; 380 } 381 } 382 } 383 384 385 #define NUL '\0' 386 #define SEPARATOR ' ' 387 388 /** 389 * Convert the server's extension string to a bit-field. 390 * 391 * \param server_string GLX extension string from the server. 392 * \param server_support Bit-field of supported extensions. 393 * 394 * \note 395 * This function is used to process both GLX and GL extension strings. The 396 * bit-fields used to track each of these have different sizes. Therefore, 397 * the data pointed by \c server_support must be preinitialized to zero. 398 */ 399 static void 400 __glXProcessServerString(const struct extension_info *ext, 401 const char *server_string, 402 unsigned char *server_support) 403 { 404 unsigned base; 405 unsigned len; 406 407 for (base = 0; server_string[base] != NUL; /* empty */ ) { 408 /* Determine the length of the next extension name. 409 */ 410 for (len = 0; (server_string[base + len] != SEPARATOR) 411 && (server_string[base + len] != NUL); len++) { 412 /* empty */ 413 } 414 415 /* Set the bit for the extension in the server_support table. 416 */ 417 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 418 server_support); 419 420 421 /* Advance to the next extension string. This means that we skip 422 * over the previous string and any trialing white-space. 423 */ 424 for (base += len; (server_string[base] == SEPARATOR) 425 && (server_string[base] != NUL); base++) { 426 /* empty */ 427 } 428 } 429 } 430 431 void 432 __glXEnableDirectExtension(struct glx_screen * psc, const char *name) 433 { 434 __glXExtensionsCtr(); 435 __glXExtensionsCtrScreen(psc); 436 437 set_glx_extension(known_glx_extensions, 438 name, strlen(name), GL_TRUE, psc->direct_support); 439 } 440 441 /** 442 * Initialize global extension support tables. 443 */ 444 445 static void 446 __glXExtensionsCtr(void) 447 { 448 unsigned i; 449 static GLboolean ext_list_first_time = GL_TRUE; 450 451 452 if (ext_list_first_time) { 453 ext_list_first_time = GL_FALSE; 454 455 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 456 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 457 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 458 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 459 460 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 461 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 462 463 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 464 const unsigned bit = known_glx_extensions[i].bit; 465 466 if (known_glx_extensions[i].client_support) { 467 SET_BIT(client_glx_support, bit); 468 } 469 470 if (known_glx_extensions[i].direct_support) { 471 SET_BIT(direct_glx_support, bit); 472 } 473 474 if (known_glx_extensions[i].client_only) { 475 SET_BIT(client_glx_only, bit); 476 } 477 478 if (known_glx_extensions[i].direct_only) { 479 SET_BIT(direct_glx_only, bit); 480 } 481 } 482 483 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 484 const unsigned bit = known_gl_extensions[i].bit; 485 486 if (known_gl_extensions[i].client_support) { 487 SET_BIT(client_gl_support, bit); 488 } 489 490 if (known_gl_extensions[i].client_only) { 491 SET_BIT(client_gl_only, bit); 492 } 493 } 494 495 #if 0 496 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 497 __func__, __LINE__, gl_major, gl_minor); 498 #endif 499 } 500 } 501 502 503 /** 504 * Make sure that per-screen direct-support table is initialized. 505 * 506 * \param psc Pointer to GLX per-screen record. 507 */ 508 509 static void 510 __glXExtensionsCtrScreen(struct glx_screen * psc) 511 { 512 if (psc->ext_list_first_time) { 513 psc->ext_list_first_time = GL_FALSE; 514 (void) memcpy(psc->direct_support, direct_glx_support, 515 sizeof(direct_glx_support)); 516 } 517 } 518 519 520 /** 521 * Check if a certain extension is enabled on a given screen. 522 * 523 * \param psc Pointer to GLX per-screen record. 524 * \param bit Bit index in the direct-support table. 525 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 526 * returned. If the extension bit is not enabled or if \c psc is 527 * \c NULL, then \c GL_FALSE is returned. 528 */ 529 GLboolean 530 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit) 531 { 532 GLboolean enabled = GL_FALSE; 533 534 if (psc != NULL) { 535 __glXExtensionsCtr(); 536 __glXExtensionsCtrScreen(psc); 537 enabled = EXT_ENABLED(bit, psc->direct_support); 538 } 539 540 return enabled; 541 } 542 543 544 /** 545 * Check if a certain extension is enabled in a given context. 546 * 547 */ 548 GLboolean 549 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit) 550 { 551 GLboolean enabled = GL_FALSE; 552 553 if (gc != NULL) { 554 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 555 } 556 557 return enabled; 558 } 559 560 561 562 /** 563 * Convert a bit-field to a string of supported extensions. 564 */ 565 static char * 566 __glXGetStringFromTable(const struct extension_info *ext, 567 const unsigned char *supported) 568 { 569 unsigned i; 570 unsigned ext_str_len; 571 char *ext_str; 572 char *point; 573 574 575 ext_str_len = 0; 576 for (i = 0; ext[i].name != NULL; i++) { 577 if (EXT_ENABLED(ext[i].bit, supported)) { 578 ext_str_len += ext[i].name_len + 1; 579 } 580 } 581 582 ext_str = malloc(ext_str_len + 1); 583 if (ext_str != NULL) { 584 point = ext_str; 585 586 for (i = 0; ext[i].name != NULL; i++) { 587 if (EXT_ENABLED(ext[i].bit, supported)) { 588 (void) memcpy(point, ext[i].name, ext[i].name_len); 589 point += ext[i].name_len; 590 591 *point = ' '; 592 point++; 593 } 594 } 595 596 *point = '\0'; 597 } 598 599 return ext_str; 600 } 601 602 603 /** 604 * Get the string of client library supported extensions. 605 */ 606 const char * 607 __glXGetClientExtensions(void) 608 { 609 if (__glXGLXClientExtensions == NULL) { 610 __glXExtensionsCtr(); 611 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 612 client_glx_support); 613 } 614 615 return __glXGLXClientExtensions; 616 } 617 618 619 /** 620 * Calculate the list of application usable extensions. The resulting 621 * string is stored in \c psc->effectiveGLXexts. 622 * 623 * \param psc Pointer to GLX per-screen record. 624 * \param display_is_direct_capable True if the display is capable of 625 * direct rendering. 626 * \param minor_version GLX minor version from the server. 627 */ 628 629 void 630 __glXCalculateUsableExtensions(struct glx_screen * psc, 631 GLboolean display_is_direct_capable, 632 int minor_version) 633 { 634 unsigned char server_support[8]; 635 unsigned char usable[8]; 636 unsigned i; 637 638 __glXExtensionsCtr(); 639 __glXExtensionsCtrScreen(psc); 640 641 (void) memset(server_support, 0, sizeof(server_support)); 642 __glXProcessServerString(known_glx_extensions, 643 psc->serverGLXexts, server_support); 644 645 646 /* This is a hack. Some servers support GLX 1.3 but don't export 647 * all of the extensions implied by GLX 1.3. If the server claims 648 * support for GLX 1.3, enable support for the extensions that can be 649 * "emulated" as well. 650 */ 651 #ifndef GLX_USE_APPLEGL 652 if (minor_version >= 3) { 653 SET_BIT(server_support, EXT_visual_info_bit); 654 SET_BIT(server_support, EXT_visual_rating_bit); 655 SET_BIT(server_support, SGI_make_current_read_bit); 656 SET_BIT(server_support, SGIX_fbconfig_bit); 657 SET_BIT(server_support, SGIX_pbuffer_bit); 658 659 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 660 * extension. However, the only part that is not strictly client-side 661 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 662 * function. 663 */ 664 665 SET_BIT(server_support, EXT_import_context_bit); 666 } 667 #endif 668 669 /* An extension is supported if the client-side (i.e., libGL) supports 670 * it and the "server" supports it. In this case that means that either 671 * the true server supports it or it is only for direct-rendering and 672 * the direct rendering driver supports it. 673 * 674 * If the display is not capable of direct rendering, then the extension 675 * is enabled if and only if the client-side library and the server 676 * support it. 677 */ 678 679 if (display_is_direct_capable) { 680 for (i = 0; i < 8; i++) { 681 usable[i] = (client_glx_support[i] & client_glx_only[i]) 682 | (client_glx_support[i] & psc->direct_support[i] & 683 server_support[i]) 684 | (client_glx_support[i] & psc->direct_support[i] & 685 direct_glx_only[i]); 686 } 687 } 688 else { 689 for (i = 0; i < 8; i++) { 690 usable[i] = (client_glx_support[i] & client_glx_only[i]) 691 | (client_glx_support[i] & server_support[i]); 692 } 693 } 694 695 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 696 usable); 697 } 698 699 700 /** 701 * Calculate the list of application usable extensions. The resulting 702 * string is stored in \c gc->extensions. 703 * 704 * \param gc Pointer to GLX context. 705 * \param server_string Extension string from the server. 706 * \param major_version GL major version from the server. 707 * \param minor_version GL minor version from the server. 708 */ 709 710 void 711 __glXCalculateUsableGLExtensions(struct glx_context * gc, 712 const char *server_string, 713 int major_version, int minor_version) 714 { 715 unsigned char server_support[__GL_EXT_BYTES]; 716 unsigned char usable[__GL_EXT_BYTES]; 717 unsigned i; 718 719 720 __glXExtensionsCtr(); 721 722 (void) memset(server_support, 0, sizeof(server_support)); 723 __glXProcessServerString(known_gl_extensions, server_string, 724 server_support); 725 726 727 /* Handle lazy servers that don't export all the extensions strings that 728 * are part of the GL core version that they support. 729 */ 730 731 for (i = 0; i < __GL_EXT_BYTES; i++) { 732 if ((known_gl_extensions[i].version_major != 0) 733 && ((major_version > known_gl_extensions[i].version_major) 734 || ((major_version == known_gl_extensions[i].version_major) 735 && (minor_version >= 736 known_gl_extensions[i].version_minor)))) { 737 SET_BIT(server_support, known_gl_extensions[i].bit); 738 } 739 } 740 741 742 /* An extension is supported if the client-side (i.e., libGL) supports 743 * it and the server supports it or the client-side library supports it 744 * and it only needs client-side support. 745 */ 746 747 for (i = 0; i < __GL_EXT_BYTES; i++) { 748 usable[i] = (client_gl_support[i] & client_gl_only[i]) 749 | (client_gl_support[i] & server_support[i]); 750 } 751 752 gc->extensions = (unsigned char *) 753 __glXGetStringFromTable(known_gl_extensions, usable); 754 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 755 } 756 757 758 /** 759 * Calculates the maximum core GL version that can be supported for indirect 760 * rendering. 761 */ 762 void 763 __glXGetGLVersion(int *major_version, int *minor_version) 764 { 765 __glXExtensionsCtr(); 766 *major_version = gl_major; 767 *minor_version = gl_minor; 768 } 769 770 771 /** 772 * Get a string representing the set of extensions supported by the client 773 * library. This is currently only used to send the list of extensions 774 * supported by the client to the server. 775 */ 776 char * 777 __glXGetClientGLExtensionString(void) 778 { 779 __glXExtensionsCtr(); 780 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 781 } 782
