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Diffstat (limited to 'src/glx/x11/glxextensions.c')
| -rw-r--r-- | src/glx/x11/glxextensions.c | 710 |
1 files changed, 710 insertions, 0 deletions
diff --git a/src/glx/x11/glxextensions.c b/src/glx/x11/glxextensions.c new file mode 100644 index 00000000000..8e7afa6b4b5 --- /dev/null +++ b/src/glx/x11/glxextensions.c @@ -0,0 +1,710 @@ +/* + * (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 <[email protected]> + */ +/* $XFree86: xc/lib/GL/glx/glxextensions.c,v 1.1 2003/09/28 20:15:03 alanh Exp $ */ + +#include "glxclient.h" +#include <extutil.h> +#include <Xext.h> +#include <string.h> +#include "glapi.h" +#include "glxextensions.h" +#include "simple_list.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? + */ +}; + +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), N, N, N, N }, /* Deprecated? */ + { 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_set_3dfx_mode), 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, N, N, N }, + { GLX(OML_sync_control), VER(0,0), Y, N, N, Y }, + { GLX(SGI_cushion), VER(0,0), N, N, N, N }, + { 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_dm_buffer), VER(0,0), N, N, N, N }, + { GLX(SGIX_fbconfig), VER(1,3), Y, N, N, N }, + { GLX(SGIX_pbuffer), VER(1,3), Y, N, 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_video_resize), VER(0,0), N, N, N, N }, + { GLX(SGIX_video_source), VER(0,0), N, N, N, N }, + { GLX(SGIX_visual_select_group), VER(0,0), Y, Y, N, N }, + { GLX(SUN_get_transparent_index), VER(0,0), N, N, N, N }, + { NULL } +}; + +static const struct extension_info known_gl_extensions[] = { + { GL(ARB_depth_texture), VER(1,4), Y, N, N, N }, + { GL(ARB_fragment_program), VER(0,0), N, 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), N, 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), N, 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_transpose_matrix), VER(1,3), Y, N, Y, N }, + { GL(ARB_vertex_buffer_object), VER(1,5), N, 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), N, 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_multi_draw_arrays), VER(1,4), Y, N, Y, 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_s3tc), VER(0,0), N, 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), N, 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_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 }, + + /* This is currently removed because there seem to be some problems with + * it and the software-only indirect rendering path. At this point, I'm + * not sure which side (client or server) has the problem. - idr + */ + { GL(HP_occlusion_test), VER(0,0), N, 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_light_max_exponent), VER(0,0), Y, N, N, N }, + { GL(NV_multisample_filter_hint), 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), N, 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(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 } +}; + + +#define __GL_EXT_BYTES ((__NUM_GL_EXTS + 7) / 8) + +/* 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 unsigned gl_major = 0; +static unsigned gl_minor = 0; + +/* 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. + */ +static void +__glXProcessServerString( const struct extension_info * ext, + const char * server_string, + unsigned char * server_support ) +{ + unsigned base; + unsigned len; + + (void) memset( server_support, 0, sizeof( server_support ) ); + + 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 */ + } + } +} + + +/** + * Enable a named GLX extension on a given screen. + * Drivers should not call this function directly. They should instead use + * \c glXGetProcAddress to obtain a pointer to the function. + * + * \param psc Pointer to GLX per-screen record. + * \param name Name of the extension to enable. + * + * \sa glXGetProcAddress + * + * \since Internal API version 20030813. + */ +void +__glXScrEnableExtension( __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 ) +{ + static const char major_table[32] = { 1, 1, 1, 1, 1, 1, 2, }; + static const char minor_table[32] = { 0, 1, 2, 3, 4, 5, 0, }; + unsigned i; + static GLboolean ext_list_first_time = GL_TRUE; + unsigned full_support = ~0; + + + 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 ); + } + else if ( known_gl_extensions[i].version_major != 0 ) { + /* If an extension that is required for some core GL version is + * not supported, clear the bit for that core GL version as well. + */ + + unsigned ver_bit = (6 * (known_gl_extensions[i].version_major - 1)) + + (known_gl_extensions[i].version_minor); + + full_support &= ~(1U << ver_bit); + } + + if ( known_gl_extensions[i].client_only ) { + SET_BIT( client_gl_only, bit ); + } + } + + /* Determine the lowest unsupported core GL version. The version before + * that is, therefore, the highest supported core GL version. + */ + for ( i = 0 ; (full_support & (1 << i)) != 0 ; i++ ) + /* empty */ ; + + i--; + gl_major = major_table[i]; + gl_minor = minor_table[i]; +#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; +} + + +/** + * 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 ); + __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 ); +} + + +/** + * 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 ); +} |