glxextensions.c revision 25620eb1d277c6b80edb136eaeca12532fcfd3ce
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 { GLX(EXT_framebuffer_sRGB), VER(0,0), Y, Y, N, N }, 87#ifdef GLX_USE_APPLEGL 88 { GLX(MESA_agp_offset), VER(0,0), N, N, N, N }, /* Deprecated */ 89 { GLX(MESA_copy_sub_buffer), VER(0,0), N, N, N, N }, 90#else 91 { GLX(MESA_agp_offset), VER(0,0), N, N, N, Y }, /* Deprecated */ 92 { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, 93#endif 94 { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N }, 95 { GLX(MESA_pixmap_colormap), VER(0,0), N, N, N, N }, /* Deprecated */ 96 { GLX(MESA_release_buffers), VER(0,0), N, N, N, N }, /* Deprecated */ 97#ifdef GLX_USE_APPLEGL 98 { GLX(MESA_swap_control), VER(0,0), N, N, N, N }, 99#else 100 { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, 101#endif 102 { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, 103 { GLX(NV_render_depth_texture), VER(0,0), N, N, N, N }, 104 { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N }, 105#ifdef GLX_USE_APPLEGL 106 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, N }, /* Deprecated */ 107 { GLX(OML_swap_method), VER(0,0), N, N, N, N }, 108 { GLX(OML_sync_control), VER(0,0), N, N, N, N }, 109 { GLX(SGI_make_current_read), VER(1,3), N, N, N, N }, 110 { GLX(SGI_swap_control), VER(0,0), N, N, N, N }, 111 { GLX(SGI_video_sync), VER(0,0), N, N, N, N }, 112#else 113 { GLX(NV_vertex_array_range), VER(0,0), N, N, N, Y }, /* Deprecated */ 114 { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, 115 { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, 116 { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, 117 { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, 118 { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, 119#endif 120 { GLX(SGIS_blended_overlay), VER(0,0), N, N, N, N }, 121 { GLX(SGIS_color_range), VER(0,0), N, N, N, N }, 122#ifdef GLX_USE_APPLEGL 123 { GLX(SGIS_multisample), VER(0,0), N, N, N, N }, 124#else 125 { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, 126#endif 127 { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, 128#ifdef GLX_USE_APPLEGL 129 { GLX(SGIX_pbuffer), VER(1,3), N, N, N, N }, 130#else 131 { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, 132#endif 133 { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, 134 { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, 135#ifdef GLX_USE_APPLEGL 136 { GLX(SGIX_visual_select_group), VER(0,0), N, N, N, N }, 137 { GLX(EXT_texture_from_pixmap), VER(0,0), N, N, N, N }, 138#else 139 { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, 140 { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, 141#endif 142 { GLX(INTEL_swap_event), VER(1,4), Y, N, N, N }, 143 { NULL } 144}; 145 146static const struct extension_info known_gl_extensions[] = { 147 { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, 148 { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, 149 { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, 150 { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, 151 { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, 152 { GL(ARB_imaging), VER(0,0), Y, N, N, N }, 153 { GL(ARB_multisample), VER(1,3), Y, N, N, N }, 154 { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, 155 { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, 156 { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, 157 { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, 158 { GL(ARB_shadow), VER(1,4), Y, N, N, N }, 159 { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, 160 { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, 161 { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, 162 { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, 163 { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, 164 { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, 165 { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, 166 { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, 167 { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, 168 { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, 169 { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, 170 { GL(ARB_texture_rg), VER(0,0), Y, N, N, N }, 171 { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, 172 { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, 173 { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, 174 { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, 175 { GL(EXT_abgr), VER(0,0), Y, N, N, N }, 176 { GL(EXT_bgra), VER(1,2), Y, N, N, N }, 177 { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, 178 { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, 179 { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, 180 { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, 181 { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, 182 { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, 183 { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, 184 { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, 185 { GL(EXT_convolution), VER(0,0), N, N, N, N }, 186 { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, 187 { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, 188 { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, 189 { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, 190 { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, 191 { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, 192 { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, 193 { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, 194 { GL(EXT_framebuffer_sRGB), VER(0,0), Y, N, N, N }, 195 { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, 196 { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, 197 { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, 198 { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, 199 { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, 200 { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, 201 { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, 202 { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, 203 { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, 204 { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, 205 { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, 206 { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, 207 { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, 208 { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, 209 { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, 210 { GL(EXT_texture), VER(1,1), Y, N, N, N }, 211 { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, 212 { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, 213 { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, 214 { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, 215 { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, 216 { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, 217 { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, 218 { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, 219 { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, 220 { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, 221 { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, 222 { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, 223 { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, 224 { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, 225 { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, 226 { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, 227 { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, 228 { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, 229 { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, 230 { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, 231 { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, 232 { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, 233 { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, 234 { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, 235 { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, 236 { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, 237 { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, 238 { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, 239 { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, 240 { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, 241 { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, 242 { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, 243 { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, 244 { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, 245 { GL(NV_blend_square), VER(1,4), Y, N, N, N }, 246 { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, 247 { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, 248 { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, 249 { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, 250 { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, 251 { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, 252 { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, 253 { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, 254 { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, 255 { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, 256 { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, 257 { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, 258 { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, 259 { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, 260 { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, 261 { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, 262 { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, 263 { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, 264 { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, 265 { GL(OES_read_format), VER(0,0), Y, N, N, N }, 266 { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, 267 { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, 268 { GL(SGI_color_table), VER(0,0), Y, N, N, N }, 269 { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, 270 { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, 271 { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, 272 { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, 273 { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, 274 { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, 275 { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, 276 { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, 277 { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, 278 { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, 279 { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, 280 { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, 281 { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, 282 { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, 283 { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, 284 { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, 285 { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, 286 { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, 287 { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, 288 { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, 289 { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, 290 { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, 291 { NULL } 292}; 293/* *INDENT-ON* */ 294 295 296/* global bit-fields of available extensions and their characteristics */ 297static unsigned char client_glx_support[8]; 298static unsigned char client_glx_only[8]; 299static unsigned char direct_glx_only[8]; 300static unsigned char client_gl_support[__GL_EXT_BYTES]; 301static unsigned char client_gl_only[__GL_EXT_BYTES]; 302 303/** 304 * Bits representing the set of extensions that are enabled by default in all 305 * direct rendering drivers. 306 */ 307static unsigned char direct_glx_support[8]; 308 309/** 310 * Highest core GL version that can be supported for indirect rendering. 311 */ 312static const unsigned gl_major = 1; 313static const unsigned gl_minor = 4; 314 315/* client extensions string */ 316static const char *__glXGLXClientExtensions = NULL; 317 318static void __glXExtensionsCtr(void); 319static void __glXExtensionsCtrScreen(struct glx_screen * psc); 320static void __glXProcessServerString(const struct extension_info *ext, 321 const char *server_string, 322 unsigned char *server_support); 323 324/** 325 * Set the state of a GLX extension. 326 * 327 * \param name Name of the extension. 328 * \param name_len Length, in characters, of the extension name. 329 * \param state New state (either enabled or disabled) of the extension. 330 * \param supported Table in which the state of the extension is to be set. 331 */ 332static void 333set_glx_extension(const struct extension_info *ext, 334 const char *name, unsigned name_len, GLboolean state, 335 unsigned char *supported) 336{ 337 unsigned i; 338 339 340 for (i = 0; ext[i].name != NULL; i++) { 341 if ((name_len == ext[i].name_len) 342 && (strncmp(ext[i].name, name, name_len) == 0)) { 343 if (state) { 344 SET_BIT(supported, ext[i].bit); 345 } 346 else { 347 CLR_BIT(supported, ext[i].bit); 348 } 349 350 return; 351 } 352 } 353} 354 355 356#define NUL '\0' 357#define SEPARATOR ' ' 358 359/** 360 * Convert the server's extension string to a bit-field. 361 * 362 * \param server_string GLX extension string from the server. 363 * \param server_support Bit-field of supported extensions. 364 * 365 * \note 366 * This function is used to process both GLX and GL extension strings. The 367 * bit-fields used to track each of these have different sizes. Therefore, 368 * the data pointed by \c server_support must be preinitialized to zero. 369 */ 370static void 371__glXProcessServerString(const struct extension_info *ext, 372 const char *server_string, 373 unsigned char *server_support) 374{ 375 unsigned base; 376 unsigned len; 377 378 for (base = 0; server_string[base] != NUL; /* empty */ ) { 379 /* Determine the length of the next extension name. 380 */ 381 for (len = 0; (server_string[base + len] != SEPARATOR) 382 && (server_string[base + len] != NUL); len++) { 383 /* empty */ 384 } 385 386 /* Set the bit for the extension in the server_support table. 387 */ 388 set_glx_extension(ext, &server_string[base], len, GL_TRUE, 389 server_support); 390 391 392 /* Advance to the next extension string. This means that we skip 393 * over the previous string and any trialing white-space. 394 */ 395 for (base += len; (server_string[base] == SEPARATOR) 396 && (server_string[base] != NUL); base++) { 397 /* empty */ 398 } 399 } 400} 401 402void 403__glXEnableDirectExtension(struct glx_screen * psc, const char *name) 404{ 405 __glXExtensionsCtr(); 406 __glXExtensionsCtrScreen(psc); 407 408 set_glx_extension(known_glx_extensions, 409 name, strlen(name), GL_TRUE, psc->direct_support); 410} 411 412/** 413 * Initialize global extension support tables. 414 */ 415 416static void 417__glXExtensionsCtr(void) 418{ 419 unsigned i; 420 static GLboolean ext_list_first_time = GL_TRUE; 421 422 423 if (ext_list_first_time) { 424 ext_list_first_time = GL_FALSE; 425 426 (void) memset(client_glx_support, 0, sizeof(client_glx_support)); 427 (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); 428 (void) memset(client_glx_only, 0, sizeof(client_glx_only)); 429 (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); 430 431 (void) memset(client_gl_support, 0, sizeof(client_gl_support)); 432 (void) memset(client_gl_only, 0, sizeof(client_gl_only)); 433 434 for (i = 0; known_glx_extensions[i].name != NULL; i++) { 435 const unsigned bit = known_glx_extensions[i].bit; 436 437 if (known_glx_extensions[i].client_support) { 438 SET_BIT(client_glx_support, bit); 439 } 440 441 if (known_glx_extensions[i].direct_support) { 442 SET_BIT(direct_glx_support, bit); 443 } 444 445 if (known_glx_extensions[i].client_only) { 446 SET_BIT(client_glx_only, bit); 447 } 448 449 if (known_glx_extensions[i].direct_only) { 450 SET_BIT(direct_glx_only, bit); 451 } 452 } 453 454 for (i = 0; known_gl_extensions[i].name != NULL; i++) { 455 const unsigned bit = known_gl_extensions[i].bit; 456 457 if (known_gl_extensions[i].client_support) { 458 SET_BIT(client_gl_support, bit); 459 } 460 461 if (known_gl_extensions[i].client_only) { 462 SET_BIT(client_gl_only, bit); 463 } 464 } 465 466#if 0 467 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", 468 __func__, __LINE__, gl_major, gl_minor); 469#endif 470 } 471} 472 473 474/** 475 * Make sure that per-screen direct-support table is initialized. 476 * 477 * \param psc Pointer to GLX per-screen record. 478 */ 479 480static void 481__glXExtensionsCtrScreen(struct glx_screen * psc) 482{ 483 if (psc->ext_list_first_time) { 484 psc->ext_list_first_time = GL_FALSE; 485 (void) memcpy(psc->direct_support, direct_glx_support, 486 sizeof(direct_glx_support)); 487 } 488} 489 490 491/** 492 * Check if a certain extension is enabled on a given screen. 493 * 494 * \param psc Pointer to GLX per-screen record. 495 * \param bit Bit index in the direct-support table. 496 * \returns If the extension bit is enabled for the screen, \c GL_TRUE is 497 * returned. If the extension bit is not enabled or if \c psc is 498 * \c NULL, then \c GL_FALSE is returned. 499 */ 500GLboolean 501__glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit) 502{ 503 GLboolean enabled = GL_FALSE; 504 505 if (psc != NULL) { 506 __glXExtensionsCtr(); 507 __glXExtensionsCtrScreen(psc); 508 enabled = EXT_ENABLED(bit, psc->direct_support); 509 } 510 511 return enabled; 512} 513 514 515/** 516 * Check if a certain extension is enabled in a given context. 517 * 518 */ 519GLboolean 520__glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit) 521{ 522 GLboolean enabled = GL_FALSE; 523 524 if (gc != NULL) { 525 enabled = EXT_ENABLED(bit, gc->gl_extension_bits); 526 } 527 528 return enabled; 529} 530 531 532 533/** 534 * Convert a bit-field to a string of supported extensions. 535 */ 536static char * 537__glXGetStringFromTable(const struct extension_info *ext, 538 const unsigned char *supported) 539{ 540 unsigned i; 541 unsigned ext_str_len; 542 char *ext_str; 543 char *point; 544 545 546 ext_str_len = 0; 547 for (i = 0; ext[i].name != NULL; i++) { 548 if (EXT_ENABLED(ext[i].bit, supported)) { 549 ext_str_len += ext[i].name_len + 1; 550 } 551 } 552 553 ext_str = Xmalloc(ext_str_len + 1); 554 if (ext_str != NULL) { 555 point = ext_str; 556 557 for (i = 0; ext[i].name != NULL; i++) { 558 if (EXT_ENABLED(ext[i].bit, supported)) { 559 (void) memcpy(point, ext[i].name, ext[i].name_len); 560 point += ext[i].name_len; 561 562 *point = ' '; 563 point++; 564 } 565 } 566 567 *point = '\0'; 568 } 569 570 return ext_str; 571} 572 573 574/** 575 * Get the string of client library supported extensions. 576 */ 577const char * 578__glXGetClientExtensions(void) 579{ 580 if (__glXGLXClientExtensions == NULL) { 581 __glXExtensionsCtr(); 582 __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, 583 client_glx_support); 584 } 585 586 return __glXGLXClientExtensions; 587} 588 589 590/** 591 * Calculate the list of application usable extensions. The resulting 592 * string is stored in \c psc->effectiveGLXexts. 593 * 594 * \param psc Pointer to GLX per-screen record. 595 * \param display_is_direct_capable True if the display is capable of 596 * direct rendering. 597 * \param minor_version GLX minor version from the server. 598 */ 599 600void 601__glXCalculateUsableExtensions(struct glx_screen * psc, 602 GLboolean display_is_direct_capable, 603 int minor_version) 604{ 605 unsigned char server_support[8]; 606 unsigned char usable[8]; 607 unsigned i; 608 609 __glXExtensionsCtr(); 610 __glXExtensionsCtrScreen(psc); 611 612 (void) memset(server_support, 0, sizeof(server_support)); 613 __glXProcessServerString(known_glx_extensions, 614 psc->serverGLXexts, server_support); 615 616 617 /* This is a hack. Some servers support GLX 1.3 but don't export 618 * all of the extensions implied by GLX 1.3. If the server claims 619 * support for GLX 1.3, enable support for the extensions that can be 620 * "emulated" as well. 621 */ 622 623 if (minor_version >= 3) { 624 SET_BIT(server_support, EXT_visual_info_bit); 625 SET_BIT(server_support, EXT_visual_rating_bit); 626 SET_BIT(server_support, SGI_make_current_read_bit); 627 SET_BIT(server_support, SGIX_fbconfig_bit); 628 SET_BIT(server_support, SGIX_pbuffer_bit); 629 630 /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this 631 * extension. However, the only part that is not strictly client-side 632 * is shared. That's the glXQueryContext / glXQueryContextInfoEXT 633 * function. 634 */ 635 636 SET_BIT(server_support, EXT_import_context_bit); 637 } 638 639 640 /* An extension is supported if the client-side (i.e., libGL) supports 641 * it and the "server" supports it. In this case that means that either 642 * the true server supports it or it is only for direct-rendering and 643 * the direct rendering driver supports it. 644 * 645 * If the display is not capable of direct rendering, then the extension 646 * is enabled if and only if the client-side library and the server 647 * support it. 648 */ 649 650 if (display_is_direct_capable) { 651 for (i = 0; i < 8; i++) { 652 usable[i] = (client_glx_support[i] & client_glx_only[i]) 653 | (client_glx_support[i] & psc->direct_support[i] & 654 server_support[i]) 655 | (client_glx_support[i] & psc->direct_support[i] & 656 direct_glx_only[i]); 657 } 658 } 659 else { 660 for (i = 0; i < 8; i++) { 661 usable[i] = (client_glx_support[i] & client_glx_only[i]) 662 | (client_glx_support[i] & server_support[i]); 663 } 664 } 665 666 psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, 667 usable); 668} 669 670 671/** 672 * Calculate the list of application usable extensions. The resulting 673 * string is stored in \c gc->extensions. 674 * 675 * \param gc Pointer to GLX context. 676 * \param server_string Extension string from the server. 677 * \param major_version GL major version from the server. 678 * \param minor_version GL minor version from the server. 679 */ 680 681void 682__glXCalculateUsableGLExtensions(struct glx_context * gc, 683 const char *server_string, 684 int major_version, int minor_version) 685{ 686 unsigned char server_support[__GL_EXT_BYTES]; 687 unsigned char usable[__GL_EXT_BYTES]; 688 unsigned i; 689 690 691 __glXExtensionsCtr(); 692 693 (void) memset(server_support, 0, sizeof(server_support)); 694 __glXProcessServerString(known_gl_extensions, server_string, 695 server_support); 696 697 698 /* Handle lazy servers that don't export all the extensions strings that 699 * are part of the GL core version that they support. 700 */ 701 702 for (i = 0; i < __GL_EXT_BYTES; i++) { 703 if ((known_gl_extensions[i].version_major != 0) 704 && ((major_version > known_gl_extensions[i].version_major) 705 || ((major_version == known_gl_extensions[i].version_major) 706 && (minor_version >= 707 known_gl_extensions[i].version_minor)))) { 708 SET_BIT(server_support, known_gl_extensions[i].bit); 709 } 710 } 711 712 713 /* An extension is supported if the client-side (i.e., libGL) supports 714 * it and the server supports it or the client-side library supports it 715 * and it only needs client-side support. 716 */ 717 718 for (i = 0; i < __GL_EXT_BYTES; i++) { 719 usable[i] = (client_gl_support[i] & client_gl_only[i]) 720 | (client_gl_support[i] & server_support[i]); 721 } 722 723 gc->extensions = (unsigned char *) 724 __glXGetStringFromTable(known_gl_extensions, usable); 725 (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); 726} 727 728 729/** 730 * Calculates the maximum core GL version that can be supported for indirect 731 * rendering. 732 */ 733void 734__glXGetGLVersion(int *major_version, int *minor_version) 735{ 736 __glXExtensionsCtr(); 737 *major_version = gl_major; 738 *minor_version = gl_minor; 739} 740 741 742/** 743 * Get a string representing the set of extensions supported by the client 744 * library. This is currently only used to send the list of extensions 745 * supported by the client to the server. 746 */ 747char * 748__glXGetClientGLExtensionString(void) 749{ 750 __glXExtensionsCtr(); 751 return __glXGetStringFromTable(known_gl_extensions, client_gl_support); 752} 753