/* * (C) Copyright IBM Corporation 2002, 2004 * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * on the rights to use, copy, modify, merge, publish, distribute, sub * license, and/or sell copies of the Software, and to permit persons to whom * the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. */ /** * \file glxextensions.c * * \author Ian Romanick <idr@us.ibm.com> */ #include "glxclient.h" #include <X11/extensions/extutil.h> #include <X11/extensions/Xext.h> #include <string.h> #include "glxextensions.h" #define SET_BIT(m,b) (m[ (b) / 8 ] |= (1U << ((b) % 8))) #define CLR_BIT(m,b) (m[ (b) / 8 ] &= ~(1U << ((b) % 8))) #define IS_SET(m,b) ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0) #define CONCAT(a,b) a ## b #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit) #define GL(n) "GL_" # n, 3 + sizeof( # n ) - 1, GL_ ## n ## _bit #define VER(a,b) a, b #define Y 1 #define N 0 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit )) struct extension_info { const char *const name; unsigned name_len; unsigned char bit; /* This is the lowest version of GLX that "requires" this extension. * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and * SGI_make_current_read. If the extension is not required by any known * version of GLX, use 0, 0. */ unsigned char version_major; unsigned char version_minor; unsigned char client_support; unsigned char direct_support; unsigned char client_only; /** Is the extension client-side only? */ unsigned char direct_only; /** Is the extension for direct * contexts only? */ }; /* *INDENT-OFF* */ static const struct extension_info known_glx_extensions[] = { { GLX(ARB_get_proc_address), VER(1,4), Y, N, Y, N }, { GLX(ARB_multisample), VER(1,4), Y, Y, N, N }, { GLX(ARB_render_texture), VER(0,0), N, N, N, N }, { GLX(ATI_pixel_format_float), VER(0,0), N, N, N, N }, { GLX(EXT_import_context), VER(0,0), Y, Y, N, N }, { GLX(EXT_visual_info), VER(0,0), Y, Y, N, N }, { GLX(EXT_visual_rating), VER(0,0), Y, Y, N, N }, { GLX(MESA_agp_offset), VER(0,0), N, N, N, Y }, /* Deprecated */ { GLX(MESA_allocate_memory), VER(0,0), Y, N, N, Y }, { GLX(MESA_copy_sub_buffer), VER(0,0), Y, N, N, N }, { GLX(MESA_pixmap_colormap), VER(0,0), N, N, N, N }, /* Deprecated */ { GLX(MESA_release_buffers), VER(0,0), N, N, N, N }, /* Deprecated */ { GLX(MESA_swap_control), VER(0,0), Y, N, N, Y }, { GLX(MESA_swap_frame_usage), VER(0,0), Y, N, N, Y }, { GLX(NV_float_buffer), VER(0,0), N, N, N, N }, { GLX(NV_render_depth_texture), VER(0,0), N, N, N, N }, { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N }, { GLX(NV_vertex_array_range), VER(0,0), N, N, N, Y }, /* Deprecated */ { GLX(OML_swap_method), VER(0,0), Y, Y, N, N }, { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, { GLX(SGI_make_current_read), VER(1,3), Y, N, N, N }, { GLX(SGI_swap_control), VER(0,0), Y, N, N, N }, { GLX(SGI_video_sync), VER(0,0), Y, N, N, Y }, { GLX(SGIS_blended_overlay), VER(0,0), N, N, N, N }, { GLX(SGIS_color_range), VER(0,0), N, N, N, N }, { GLX(SGIS_multisample), VER(0,0), Y, Y, N, N }, { GLX(SGIX_fbconfig), VER(1,3), Y, Y, N, N }, { GLX(SGIX_pbuffer), VER(1,3), Y, Y, N, N }, { GLX(SGIX_swap_barrier), VER(0,0), N, N, N, N }, { GLX(SGIX_swap_group), VER(0,0), N, N, N, N }, { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, { GLX(EXT_texture_from_pixmap), VER(0,0), Y, N, N, N }, { GLX(INTEL_swap_event), VER(1,4), Y, Y, N, N }, { NULL } }; static const struct extension_info known_gl_extensions[] = { { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, { GL(ARB_draw_buffers), VER(0,0), Y, N, N, N }, { GL(ARB_fragment_program), VER(0,0), Y, N, N, N }, { GL(ARB_fragment_program_shadow), VER(0,0), Y, N, N, N }, { GL(ARB_framebuffer_object), VER(0,0), Y, N, N, N }, { GL(ARB_imaging), VER(0,0), Y, N, N, N }, { GL(ARB_multisample), VER(1,3), Y, N, N, N }, { GL(ARB_multitexture), VER(1,3), Y, N, N, N }, { GL(ARB_occlusion_query), VER(1,5), Y, N, N, N }, { GL(ARB_point_parameters), VER(1,4), Y, N, N, N }, { GL(ARB_point_sprite), VER(0,0), Y, N, N, N }, { GL(ARB_shadow), VER(1,4), Y, N, N, N }, { GL(ARB_shadow_ambient), VER(0,0), Y, N, N, N }, { GL(ARB_texture_border_clamp), VER(1,3), Y, N, N, N }, { GL(ARB_texture_compression), VER(1,3), Y, N, N, N }, { GL(ARB_texture_cube_map), VER(1,3), Y, N, N, N }, { GL(ARB_texture_env_add), VER(1,3), Y, N, N, N }, { GL(ARB_texture_env_combine), VER(1,3), Y, N, N, N }, { GL(ARB_texture_env_crossbar), VER(1,4), Y, N, N, N }, { GL(ARB_texture_env_dot3), VER(1,3), Y, N, N, N }, { GL(ARB_texture_mirrored_repeat), VER(1,4), Y, N, N, N }, { GL(ARB_texture_non_power_of_two), VER(1,5), Y, N, N, N }, { GL(ARB_texture_rectangle), VER(0,0), Y, N, N, N }, { GL(ARB_transpose_matrix), VER(1,3), Y, N, Y, N }, { GL(ARB_vertex_buffer_object), VER(1,5), N, N, N, N }, { GL(ARB_vertex_program), VER(0,0), Y, N, N, N }, { GL(ARB_window_pos), VER(1,4), Y, N, N, N }, { GL(EXT_abgr), VER(0,0), Y, N, N, N }, { GL(EXT_bgra), VER(1,2), Y, N, N, N }, { GL(EXT_blend_color), VER(1,4), Y, N, N, N }, { GL(EXT_blend_equation_separate), VER(0,0), Y, N, N, N }, { GL(EXT_blend_func_separate), VER(1,4), Y, N, N, N }, { GL(EXT_blend_logic_op), VER(1,4), Y, N, N, N }, { GL(EXT_blend_minmax), VER(1,4), Y, N, N, N }, { GL(EXT_blend_subtract), VER(1,4), Y, N, N, N }, { GL(EXT_clip_volume_hint), VER(0,0), Y, N, N, N }, { GL(EXT_compiled_vertex_array), VER(0,0), N, N, N, N }, { GL(EXT_convolution), VER(0,0), N, N, N, N }, { GL(EXT_copy_texture), VER(1,1), Y, N, N, N }, { GL(EXT_cull_vertex), VER(0,0), N, N, N, N }, { GL(EXT_depth_bounds_test), VER(0,0), N, N, N, N }, { GL(EXT_draw_range_elements), VER(1,2), Y, N, Y, N }, { GL(EXT_fog_coord), VER(1,4), Y, N, N, N }, { GL(EXT_framebuffer_blit), VER(0,0), Y, N, N, N }, { GL(EXT_framebuffer_multisample), VER(0,0), Y, N, N, N }, { GL(EXT_framebuffer_object), VER(0,0), Y, N, N, N }, { GL(EXT_multi_draw_arrays), VER(1,4), Y, N, Y, N }, { GL(EXT_packed_depth_stencil), VER(0,0), Y, N, N, N }, { GL(EXT_packed_pixels), VER(1,2), Y, N, N, N }, { GL(EXT_paletted_texture), VER(0,0), Y, N, N, N }, { GL(EXT_pixel_buffer_object), VER(0,0), N, N, N, N }, { GL(EXT_point_parameters), VER(1,4), Y, N, N, N }, { GL(EXT_polygon_offset), VER(1,1), Y, N, N, N }, { GL(EXT_rescale_normal), VER(1,2), Y, N, N, N }, { GL(EXT_secondary_color), VER(1,4), Y, N, N, N }, { GL(EXT_separate_specular_color), VER(1,2), Y, N, N, N }, { GL(EXT_shadow_funcs), VER(1,5), Y, N, N, N }, { GL(EXT_shared_texture_palette), VER(0,0), Y, N, N, N }, { GL(EXT_stencil_two_side), VER(0,0), Y, N, N, N }, { GL(EXT_stencil_wrap), VER(1,4), Y, N, N, N }, { GL(EXT_subtexture), VER(1,1), Y, N, N, N }, { GL(EXT_texture), VER(1,1), Y, N, N, N }, { GL(EXT_texture3D), VER(1,2), Y, N, N, N }, { GL(EXT_texture_compression_dxt1), VER(0,0), Y, N, N, N }, { GL(EXT_texture_compression_s3tc), VER(0,0), Y, N, N, N }, { GL(EXT_texture_edge_clamp), VER(1,2), Y, N, N, N }, { GL(EXT_texture_env_add), VER(1,3), Y, N, N, N }, { GL(EXT_texture_env_combine), VER(1,3), Y, N, N, N }, { GL(EXT_texture_env_dot3), VER(0,0), Y, N, N, N }, { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N }, { GL(EXT_texture_lod), VER(1,2), Y, N, N, N }, { GL(EXT_texture_lod_bias), VER(1,4), Y, N, N, N }, { GL(EXT_texture_mirror_clamp), VER(0,0), Y, N, N, N }, { GL(EXT_texture_object), VER(1,1), Y, N, N, N }, { GL(EXT_texture_rectangle), VER(0,0), Y, N, N, N }, { GL(EXT_vertex_array), VER(0,0), Y, N, N, N }, { GL(3DFX_texture_compression_FXT1), VER(0,0), Y, N, N, N }, { GL(APPLE_packed_pixels), VER(1,2), Y, N, N, N }, { GL(APPLE_ycbcr_422), VER(0,0), Y, N, N, N }, { GL(ATI_draw_buffers), VER(0,0), Y, N, N, N }, { GL(ATI_text_fragment_shader), VER(0,0), Y, N, N, N }, { GL(ATI_texture_env_combine3), VER(0,0), Y, N, N, N }, { GL(ATI_texture_float), VER(0,0), Y, N, N, N }, { GL(ATI_texture_mirror_once), VER(0,0), Y, N, N, N }, { GL(ATIX_texture_env_combine3), VER(0,0), Y, N, N, N }, { GL(HP_convolution_border_modes), VER(0,0), Y, N, N, N }, { GL(HP_occlusion_test), VER(0,0), Y, N, N, N }, { GL(IBM_cull_vertex), VER(0,0), Y, N, N, N }, { GL(IBM_pixel_filter_hint), VER(0,0), Y, N, N, N }, { GL(IBM_rasterpos_clip), VER(0,0), Y, N, N, N }, { GL(IBM_texture_clamp_nodraw), VER(0,0), Y, N, N, N }, { GL(IBM_texture_mirrored_repeat), VER(0,0), Y, N, N, N }, { GL(INGR_blend_func_separate), VER(0,0), Y, N, N, N }, { GL(INGR_interlace_read), VER(0,0), Y, N, N, N }, { GL(MESA_pack_invert), VER(0,0), Y, N, N, N }, { GL(MESA_ycbcr_texture), VER(0,0), Y, N, N, N }, { GL(NV_blend_square), VER(1,4), Y, N, N, N }, { GL(NV_copy_depth_to_color), VER(0,0), Y, N, N, N }, { GL(NV_depth_clamp), VER(0,0), Y, N, N, N }, { GL(NV_fog_distance), VER(0,0), Y, N, N, N }, { GL(NV_fragment_program), VER(0,0), Y, N, N, N }, { GL(NV_fragment_program_option), VER(0,0), Y, N, N, N }, { GL(NV_fragment_program2), VER(0,0), Y, N, N, N }, { GL(NV_light_max_exponent), VER(0,0), Y, N, N, N }, { GL(NV_multisample_filter_hint), VER(0,0), Y, N, N, N }, { GL(NV_packed_depth_stencil), VER(0,0), Y, N, N, N }, { GL(NV_point_sprite), VER(0,0), Y, N, N, N }, { GL(NV_texgen_reflection), VER(0,0), Y, N, N, N }, { GL(NV_texture_compression_vtc), VER(0,0), Y, N, N, N }, { GL(NV_texture_env_combine4), VER(0,0), Y, N, N, N }, { GL(NV_texture_rectangle), VER(0,0), Y, N, N, N }, { GL(NV_vertex_program), VER(0,0), Y, N, N, N }, { GL(NV_vertex_program1_1), VER(0,0), Y, N, N, N }, { GL(NV_vertex_program2), VER(0,0), Y, N, N, N }, { GL(NV_vertex_program2_option), VER(0,0), Y, N, N, N }, { GL(NV_vertex_program3), VER(0,0), Y, N, N, N }, { GL(OES_read_format), VER(0,0), Y, N, N, N }, { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N }, { GL(SGI_color_matrix), VER(0,0), Y, N, N, N }, { GL(SGI_color_table), VER(0,0), Y, N, N, N }, { GL(SGI_texture_color_table), VER(0,0), Y, N, N, N }, { GL(SGIS_generate_mipmap), VER(1,4), Y, N, N, N }, { GL(SGIS_multisample), VER(0,0), Y, N, N, N }, { GL(SGIS_texture_border_clamp), VER(1,3), Y, N, N, N }, { GL(SGIS_texture_edge_clamp), VER(1,2), Y, N, N, N }, { GL(SGIS_texture_lod), VER(1,2), Y, N, N, N }, { GL(SGIX_blend_alpha_minmax), VER(0,0), Y, N, N, N }, { GL(SGIX_clipmap), VER(0,0), Y, N, N, N }, { GL(SGIX_depth_texture), VER(0,0), Y, N, N, N }, { GL(SGIX_fog_offset), VER(0,0), Y, N, N, N }, { GL(SGIX_shadow), VER(0,0), Y, N, N, N }, { GL(SGIX_shadow_ambient), VER(0,0), Y, N, N, N }, { GL(SGIX_texture_coordinate_clamp), VER(0,0), Y, N, N, N }, { GL(SGIX_texture_lod_bias), VER(0,0), Y, N, N, N }, { GL(SGIX_texture_range), VER(0,0), Y, N, N, N }, { GL(SGIX_texture_scale_bias), VER(0,0), Y, N, N, N }, { GL(SGIX_vertex_preclip), VER(0,0), Y, N, N, N }, { GL(SGIX_vertex_preclip_hint), VER(0,0), Y, N, N, N }, { GL(SGIX_ycrcb), VER(0,0), Y, N, N, N }, { GL(SUN_convolution_border_modes), VER(0,0), Y, N, N, N }, { GL(SUN_multi_draw_arrays), VER(0,0), Y, N, Y, N }, { GL(SUN_slice_accum), VER(0,0), Y, N, N, N }, { NULL } }; /* *INDENT-ON* */ /* global bit-fields of available extensions and their characteristics */ static unsigned char client_glx_support[8]; static unsigned char client_glx_only[8]; static unsigned char direct_glx_only[8]; static unsigned char client_gl_support[__GL_EXT_BYTES]; static unsigned char client_gl_only[__GL_EXT_BYTES]; /** * Bits representing the set of extensions that are enabled by default in all * direct rendering drivers. */ static unsigned char direct_glx_support[8]; /** * Highest core GL version that can be supported for indirect rendering. */ static const unsigned gl_major = 1; static const unsigned gl_minor = 4; /* client extensions string */ static const char *__glXGLXClientExtensions = NULL; static void __glXExtensionsCtr(void); static void __glXExtensionsCtrScreen(__GLXscreenConfigs * psc); static void __glXProcessServerString(const struct extension_info *ext, const char *server_string, unsigned char *server_support); /** * Set the state of a GLX extension. * * \param name Name of the extension. * \param name_len Length, in characters, of the extension name. * \param state New state (either enabled or disabled) of the extension. * \param supported Table in which the state of the extension is to be set. */ static void set_glx_extension(const struct extension_info *ext, const char *name, unsigned name_len, GLboolean state, unsigned char *supported) { unsigned i; for (i = 0; ext[i].name != NULL; i++) { if ((name_len == ext[i].name_len) && (strncmp(ext[i].name, name, name_len) == 0)) { if (state) { SET_BIT(supported, ext[i].bit); } else { CLR_BIT(supported, ext[i].bit); } return; } } } #define NUL '\0' #define SEPARATOR ' ' /** * Convert the server's extension string to a bit-field. * * \param server_string GLX extension string from the server. * \param server_support Bit-field of supported extensions. * * \note * This function is used to process both GLX and GL extension strings. The * bit-fields used to track each of these have different sizes. Therefore, * the data pointed by \c server_support must be preinitialized to zero. */ static void __glXProcessServerString(const struct extension_info *ext, const char *server_string, unsigned char *server_support) { unsigned base; unsigned len; for (base = 0; server_string[base] != NUL; /* empty */ ) { /* Determine the length of the next extension name. */ for (len = 0; (server_string[base + len] != SEPARATOR) && (server_string[base + len] != NUL); len++) { /* empty */ } /* Set the bit for the extension in the server_support table. */ set_glx_extension(ext, &server_string[base], len, GL_TRUE, server_support); /* Advance to the next extension string. This means that we skip * over the previous string and any trialing white-space. */ for (base += len; (server_string[base] == SEPARATOR) && (server_string[base] != NUL); base++) { /* empty */ } } } void __glXEnableDirectExtension(__GLXscreenConfigs * psc, const char *name) { __glXExtensionsCtr(); __glXExtensionsCtrScreen(psc); set_glx_extension(known_glx_extensions, name, strlen(name), GL_TRUE, psc->direct_support); } /** * Initialize global extension support tables. */ static void __glXExtensionsCtr(void) { unsigned i; static GLboolean ext_list_first_time = GL_TRUE; if (ext_list_first_time) { ext_list_first_time = GL_FALSE; (void) memset(client_glx_support, 0, sizeof(client_glx_support)); (void) memset(direct_glx_support, 0, sizeof(direct_glx_support)); (void) memset(client_glx_only, 0, sizeof(client_glx_only)); (void) memset(direct_glx_only, 0, sizeof(direct_glx_only)); (void) memset(client_gl_support, 0, sizeof(client_gl_support)); (void) memset(client_gl_only, 0, sizeof(client_gl_only)); for (i = 0; known_glx_extensions[i].name != NULL; i++) { const unsigned bit = known_glx_extensions[i].bit; if (known_glx_extensions[i].client_support) { SET_BIT(client_glx_support, bit); } if (known_glx_extensions[i].direct_support) { SET_BIT(direct_glx_support, bit); } if (known_glx_extensions[i].client_only) { SET_BIT(client_glx_only, bit); } if (known_glx_extensions[i].direct_only) { SET_BIT(direct_glx_only, bit); } } for (i = 0; known_gl_extensions[i].name != NULL; i++) { const unsigned bit = known_gl_extensions[i].bit; if (known_gl_extensions[i].client_support) { SET_BIT(client_gl_support, bit); } if (known_gl_extensions[i].client_only) { SET_BIT(client_gl_only, bit); } } #if 0 fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n", __func__, __LINE__, gl_major, gl_minor); #endif } } /** * Make sure that per-screen direct-support table is initialized. * * \param psc Pointer to GLX per-screen record. */ static void __glXExtensionsCtrScreen(__GLXscreenConfigs * psc) { if (psc->ext_list_first_time) { psc->ext_list_first_time = GL_FALSE; (void) memcpy(psc->direct_support, direct_glx_support, sizeof(direct_glx_support)); } } /** * Check if a certain extension is enabled on a given screen. * * \param psc Pointer to GLX per-screen record. * \param bit Bit index in the direct-support table. * \returns If the extension bit is enabled for the screen, \c GL_TRUE is * returned. If the extension bit is not enabled or if \c psc is * \c NULL, then \c GL_FALSE is returned. */ GLboolean __glXExtensionBitIsEnabled(__GLXscreenConfigs * psc, unsigned bit) { GLboolean enabled = GL_FALSE; if (psc != NULL) { __glXExtensionsCtr(); __glXExtensionsCtrScreen(psc); enabled = EXT_ENABLED(bit, psc->direct_support); } return enabled; } /** * Check if a certain extension is enabled in a given context. * */ GLboolean __glExtensionBitIsEnabled(const __GLXcontext * gc, unsigned bit) { GLboolean enabled = GL_FALSE; if (gc != NULL) { enabled = EXT_ENABLED(bit, gc->gl_extension_bits); } return enabled; } /** * Convert a bit-field to a string of supported extensions. */ static char * __glXGetStringFromTable(const struct extension_info *ext, const unsigned char *supported) { unsigned i; unsigned ext_str_len; char *ext_str; char *point; ext_str_len = 0; for (i = 0; ext[i].name != NULL; i++) { if (EXT_ENABLED(ext[i].bit, supported)) { ext_str_len += ext[i].name_len + 1; } } ext_str = Xmalloc(ext_str_len + 1); if (ext_str != NULL) { point = ext_str; for (i = 0; ext[i].name != NULL; i++) { if (EXT_ENABLED(ext[i].bit, supported)) { (void) memcpy(point, ext[i].name, ext[i].name_len); point += ext[i].name_len; *point = ' '; point++; } } *point = '\0'; } return ext_str; } /** * Get the string of client library supported extensions. */ const char * __glXGetClientExtensions(void) { if (__glXGLXClientExtensions == NULL) { __glXExtensionsCtr(); __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions, client_glx_support); } return __glXGLXClientExtensions; } /** * Calculate the list of application usable extensions. The resulting * string is stored in \c psc->effectiveGLXexts. * * \param psc Pointer to GLX per-screen record. * \param display_is_direct_capable True if the display is capable of * direct rendering. * \param minor_version GLX minor version from the server. */ void __glXCalculateUsableExtensions(__GLXscreenConfigs * psc, GLboolean display_is_direct_capable, int minor_version) { unsigned char server_support[8]; unsigned char usable[8]; unsigned i; __glXExtensionsCtr(); __glXExtensionsCtrScreen(psc); (void) memset(server_support, 0, sizeof(server_support)); __glXProcessServerString(known_glx_extensions, psc->serverGLXexts, server_support); /* This is a hack. Some servers support GLX 1.3 but don't export * all of the extensions implied by GLX 1.3. If the server claims * support for GLX 1.3, enable support for the extensions that can be * "emulated" as well. */ if (minor_version >= 3) { SET_BIT(server_support, EXT_visual_info_bit); SET_BIT(server_support, EXT_visual_rating_bit); SET_BIT(server_support, SGI_make_current_read_bit); SET_BIT(server_support, SGIX_fbconfig_bit); SET_BIT(server_support, SGIX_pbuffer_bit); /* This one is a little iffy. GLX 1.3 doesn't incorporate all of this * extension. However, the only part that is not strictly client-side * is shared. That's the glXQueryContext / glXQueryContextInfoEXT * function. */ SET_BIT(server_support, EXT_import_context_bit); } /* An extension is supported if the client-side (i.e., libGL) supports * it and the "server" supports it. In this case that means that either * the true server supports it or it is only for direct-rendering and * the direct rendering driver supports it. * * If the display is not capable of direct rendering, then the extension * is enabled if and only if the client-side library and the server * support it. */ if (display_is_direct_capable) { for (i = 0; i < 8; i++) { usable[i] = (client_glx_support[i] & client_glx_only[i]) | (client_glx_support[i] & psc->direct_support[i] & server_support[i]) | (client_glx_support[i] & psc->direct_support[i] & direct_glx_only[i]); } } else { for (i = 0; i < 8; i++) { usable[i] = (client_glx_support[i] & client_glx_only[i]) | (client_glx_support[i] & server_support[i]); } } psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions, usable); } /** * Calculate the list of application usable extensions. The resulting * string is stored in \c gc->extensions. * * \param gc Pointer to GLX context. * \param server_string Extension string from the server. * \param major_version GL major version from the server. * \param minor_version GL minor version from the server. */ void __glXCalculateUsableGLExtensions(__GLXcontext * gc, const char *server_string, int major_version, int minor_version) { unsigned char server_support[__GL_EXT_BYTES]; unsigned char usable[__GL_EXT_BYTES]; unsigned i; __glXExtensionsCtr(); (void) memset(server_support, 0, sizeof(server_support)); __glXProcessServerString(known_gl_extensions, server_string, server_support); /* Handle lazy servers that don't export all the extensions strings that * are part of the GL core version that they support. */ for (i = 0; i < __GL_EXT_BYTES; i++) { if ((known_gl_extensions[i].version_major != 0) && ((major_version > known_gl_extensions[i].version_major) || ((major_version == known_gl_extensions[i].version_major) && (minor_version >= known_gl_extensions[i].version_minor)))) { SET_BIT(server_support, known_gl_extensions[i].bit); } } /* An extension is supported if the client-side (i.e., libGL) supports * it and the server supports it or the client-side library supports it * and it only needs client-side support. */ for (i = 0; i < __GL_EXT_BYTES; i++) { usable[i] = (client_gl_support[i] & client_gl_only[i]) | (client_gl_support[i] & server_support[i]); } gc->extensions = (unsigned char *) __glXGetStringFromTable(known_gl_extensions, usable); (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable)); } /** * Calculates the maximum core GL version that can be supported for indirect * rendering. */ void __glXGetGLVersion(int *major_version, int *minor_version) { __glXExtensionsCtr(); *major_version = gl_major; *minor_version = gl_minor; } /** * Get a string representing the set of extensions supported by the client * library. This is currently only used to send the list of extensions * supported by the client to the server. */ char * __glXGetClientGLExtensionString(void) { __glXExtensionsCtr(); return __glXGetStringFromTable(known_gl_extensions, client_gl_support); }