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+/*
+ * (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 "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), 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_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, Y, 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, Y, 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 },
+ { GLX(EXT_texture_from_pixmap), VER(0,0), Y, 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_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_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), 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_framebuffer_object), VER(0,0), 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_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_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_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 }
+};
+
+
+/* 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 */
+ }
+ }
+}
+
+
+/**
+ * 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 )
+{
+ 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 );
+}