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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 "glxextensions.h"
#include "util/driconf.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 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;
/**
* The direct-renderer (e.g., i965_dri.so) supports this extension.
*
* For cases where all of the infrastructure to support the extension is a
* required part of the loader/driver interface, this can default to Y.
* For most cases, extended functionality, usually in the form of DRI2
* extensions, is necessary to support the extension. The loader will set
* the flag true if all the requirements are met.
*
* If the display is capable of direct rendering, ::direct_support is
* required for the extension to be enabled.
*/
unsigned char direct_support;
/**
* The extension only functions with direct-rendering contexts
*
* The extension has no GLX protocol, and, therefore, no explicit
* dependency on the server. The functionality is contained entirely in
* the client library and the direct renderer. A few of the swap-related
* extensions are intended to behave this way.
*/
unsigned char direct_only;
};
/* *INDENT-OFF* */
static const struct extension_info known_glx_extensions[] = {
{ GLX(ARB_context_flush_control), N, N },
{ GLX(ARB_create_context), N, N },
{ GLX(ARB_create_context_no_error), N, N },
{ GLX(ARB_create_context_profile), N, N },
{ GLX(ARB_create_context_robustness), N, N },
{ GLX(ARB_fbconfig_float), Y, N },
{ GLX(ARB_framebuffer_sRGB), Y, N },
{ GLX(ARB_get_proc_address), N, N },
{ GLX(ARB_multisample), Y, N },
{ GLX(EXT_buffer_age), N, Y },
{ GLX(EXT_create_context_es2_profile), N, N },
{ GLX(EXT_create_context_es_profile), N, N },
{ GLX(EXT_fbconfig_packed_float), Y, N },
{ GLX(EXT_framebuffer_sRGB), Y, N },
{ GLX(EXT_import_context), Y, N },
{ GLX(EXT_no_config_context), N, N },
{ GLX(EXT_swap_control), N, Y },
{ GLX(EXT_swap_control_tear), N, Y },
{ GLX(EXT_texture_from_pixmap), N, N },
{ GLX(EXT_visual_info), Y, N },
{ GLX(EXT_visual_rating), Y, N },
{ GLX(ATI_pixel_format_float), N, N },
{ GLX(INTEL_swap_event), N, N },
{ GLX(MESA_copy_sub_buffer), N, N },
{ GLX(MESA_query_renderer), N, Y },
{ GLX(MESA_swap_control), N, Y },
{ GLX(NV_float_buffer), N, N },
{ GLX(OML_swap_method), Y, N },
{ GLX(OML_sync_control), N, Y },
{ GLX(SGIS_multisample), Y, N },
{ GLX(SGIX_fbconfig), Y, N },
{ GLX(SGIX_pbuffer), Y, N },
{ GLX(SGIX_visual_select_group), Y, N },
{ GLX(SGI_make_current_read), N, N },
{ GLX(SGI_swap_control), N, N },
{ GLX(SGI_video_sync), N, Y },
{ NULL }
};
static const struct extension_info known_gl_extensions[] = {
{ GL(ARB_depth_texture), N, N },
{ GL(ARB_draw_buffers), N, N },
{ GL(ARB_fragment_program), N, N },
{ GL(ARB_fragment_program_shadow), N, N },
{ GL(ARB_framebuffer_object), N, N },
{ GL(ARB_imaging), N, N },
{ GL(ARB_multisample), N, N },
{ GL(ARB_multitexture), N, N },
{ GL(ARB_occlusion_query), N, N },
{ GL(ARB_point_parameters), N, N },
{ GL(ARB_point_sprite), N, N },
{ GL(ARB_shadow), N, N },
{ GL(ARB_shadow_ambient), N, N },
{ GL(ARB_texture_border_clamp), N, N },
{ GL(ARB_texture_compression), N, N },
{ GL(ARB_texture_cube_map), N, N },
{ GL(ARB_texture_env_add), N, N },
{ GL(ARB_texture_env_combine), N, N },
{ GL(ARB_texture_env_crossbar), N, N },
{ GL(ARB_texture_env_dot3), N, N },
{ GL(ARB_texture_filter_anisotropic), N, N },
{ GL(ARB_texture_mirrored_repeat), N, N },
{ GL(ARB_texture_non_power_of_two), N, N },
{ GL(ARB_texture_rectangle), N, N },
{ GL(ARB_texture_rg), N, N },
{ GL(ARB_transpose_matrix), N, N },
{ GL(ARB_vertex_program), N, N },
{ GL(ARB_window_pos), N, N },
{ GL(EXT_abgr), N, N },
{ GL(EXT_bgra), N, N },
{ GL(EXT_blend_color), N, N },
{ GL(EXT_blend_equation_separate), N, N },
{ GL(EXT_blend_func_separate), N, N },
{ GL(EXT_blend_logic_op), N, N },
{ GL(EXT_blend_minmax), N, N },
{ GL(EXT_blend_subtract), N, N },
{ GL(EXT_clip_volume_hint), N, N },
{ GL(EXT_copy_texture), N, N },
{ GL(EXT_draw_range_elements), N, N },
{ GL(EXT_fog_coord), N, N },
{ GL(EXT_framebuffer_blit), N, N },
{ GL(EXT_framebuffer_multisample), N, N },
{ GL(EXT_framebuffer_object), N, N },
{ GL(EXT_framebuffer_sRGB), N, N },
{ GL(EXT_multi_draw_arrays), N, N },
{ GL(EXT_packed_depth_stencil), N, N },
{ GL(EXT_packed_pixels), N, N },
{ GL(EXT_paletted_texture), N, N },
{ GL(EXT_point_parameters), N, N },
{ GL(EXT_polygon_offset), N, N },
{ GL(EXT_rescale_normal), N, N },
{ GL(EXT_secondary_color), N, N },
{ GL(EXT_separate_specular_color), N, N },
{ GL(EXT_shadow_funcs), N, N },
{ GL(EXT_shared_texture_palette), N, N },
{ GL(EXT_stencil_two_side), N, N },
{ GL(EXT_stencil_wrap), N, N },
{ GL(EXT_subtexture), N, N },
{ GL(EXT_texture), N, N },
{ GL(EXT_texture3D), N, N },
{ GL(EXT_texture_compression_dxt1), N, N },
{ GL(EXT_texture_compression_s3tc), N, N },
{ GL(EXT_texture_edge_clamp), N, N },
{ GL(EXT_texture_env_add), N, N },
{ GL(EXT_texture_env_combine), N, N },
{ GL(EXT_texture_env_dot3), N, N },
{ GL(EXT_texture_filter_anisotropic), N, N },
{ GL(EXT_texture_integer), N, N },
{ GL(EXT_texture_lod), N, N },
{ GL(EXT_texture_lod_bias), N, N },
{ GL(EXT_texture_mirror_clamp), N, N },
{ GL(EXT_texture_object), N, N },
{ GL(EXT_texture_rectangle), N, N },
{ GL(EXT_vertex_array), N, N },
{ GL(3DFX_texture_compression_FXT1), N, N },
{ GL(APPLE_packed_pixels), N, N },
{ GL(APPLE_ycbcr_422), N, N },
{ GL(ATI_draw_buffers), N, N },
{ GL(ATI_text_fragment_shader), N, N },
{ GL(ATI_texture_env_combine3), N, N },
{ GL(ATI_texture_float), N, N },
{ GL(ATI_texture_mirror_once), N, N },
{ GL(ATIX_texture_env_combine3), N, N },
{ GL(HP_convolution_border_modes), N, N },
{ GL(HP_occlusion_test), N, N },
{ GL(IBM_cull_vertex), N, N },
{ GL(IBM_pixel_filter_hint), N, N },
{ GL(IBM_rasterpos_clip), N, N },
{ GL(IBM_texture_clamp_nodraw), N, N },
{ GL(IBM_texture_mirrored_repeat), N, N },
{ GL(INGR_blend_func_separate), N, N },
{ GL(INGR_interlace_read), N, N },
{ GL(MESA_pack_invert), N, N },
{ GL(MESA_ycbcr_texture), N, N },
{ GL(NV_blend_square), N, N },
{ GL(NV_copy_depth_to_color), N, N },
{ GL(NV_depth_clamp), N, N },
{ GL(NV_fog_distance), N, N },
{ GL(NV_fragment_program), N, N },
{ GL(NV_fragment_program_option), N, N },
{ GL(NV_fragment_program2), N, N },
{ GL(NV_light_max_exponent), N, N },
{ GL(NV_multisample_filter_hint), N, N },
{ GL(NV_packed_depth_stencil), N, N },
{ GL(NV_point_sprite), N, N },
{ GL(NV_texgen_reflection), N, N },
{ GL(NV_texture_compression_vtc), N, N },
{ GL(NV_texture_env_combine4), N, N },
{ GL(NV_texture_rectangle), N, N },
{ GL(NV_vertex_program), N, N },
{ GL(NV_vertex_program1_1), N, N },
{ GL(NV_vertex_program2), N, N },
{ GL(NV_vertex_program2_option), N, N },
{ GL(NV_vertex_program3), N, N },
{ GL(OES_read_format), N, N },
{ GL(OES_compressed_paletted_texture), N, N },
{ GL(SGI_color_matrix), N, N },
{ GL(SGI_color_table), N, N },
{ GL(SGI_texture_color_table), N, N },
{ GL(SGIS_generate_mipmap), N, N },
{ GL(SGIS_multisample), N, N },
{ GL(SGIS_texture_border_clamp), N, N },
{ GL(SGIS_texture_edge_clamp), N, N },
{ GL(SGIS_texture_lod), N, N },
{ GL(SGIX_blend_alpha_minmax), N, N },
{ GL(SGIX_clipmap), N, N },
{ GL(SGIX_depth_texture), N, N },
{ GL(SGIX_fog_offset), N, N },
{ GL(SGIX_shadow), N, N },
{ GL(SGIX_shadow_ambient), N, N },
{ GL(SGIX_texture_coordinate_clamp), N, N },
{ GL(SGIX_texture_lod_bias), N, N },
{ GL(SGIX_texture_range), N, N },
{ GL(SGIX_texture_scale_bias), N, N },
{ GL(SGIX_vertex_preclip), N, N },
{ GL(SGIX_vertex_preclip_hint), N, N },
{ GL(SGIX_ycrcb), N, N },
{ GL(SUN_convolution_border_modes), N, N },
{ GL(SUN_multi_draw_arrays), N, N },
{ GL(SUN_slice_accum), N, N },
{ NULL }
};
/* *INDENT-ON* */
/* global bit-fields of available extensions and their characteristics */
static unsigned char client_glx_only[__GLX_EXT_BYTES];
static unsigned char direct_glx_only[__GLX_EXT_BYTES];
/**
* Bits representing the set of extensions that are enabled by default in all
* direct rendering drivers.
*/
static unsigned char direct_glx_support[__GLX_EXT_BYTES];
/* client extensions string */
static const char *__glXGLXClientExtensions = NULL;
static void __glXExtensionsCtr(void);
static void __glXExtensionsCtrScreen(struct glx_screen * psc);
static void __glXProcessServerString(const struct extension_info *ext,
const char *server_string,
unsigned char *server_support);
/**
* Find an extension in the list based on its name.
*
* \param ext List of extensions where to search.
* \param name Name of the extension.
* \param name_len Length, in characters, of the extension name.
*/
static const struct extension_info *
find_extension(const struct extension_info *ext, const char *name,
unsigned name_len)
{
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)) {
return &ext[i];
}
}
return NULL;
}
/**
* 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_list,
const char *name, unsigned name_len, GLboolean state,
unsigned char *supported)
{
const struct extension_info *ext = find_extension(ext_list, name, name_len);
if (!ext)
return;
if (state) {
SET_BIT(supported, ext->bit);
} else {
CLR_BIT(supported, ext->bit);
}
}
#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(struct glx_screen * psc, const char *name)
{
__glXExtensionsCtr();
__glXExtensionsCtrScreen(psc);
set_glx_extension(known_glx_extensions,
name, strlen(name), GL_TRUE, psc->direct_support);
}
static void
__ParseExtensionOverride(struct glx_screen *psc,
const struct extension_info *ext_list,
unsigned char *force_enable,
unsigned char *force_disable,
const char *override)
{
const struct extension_info *ext;
char *env, *field;
if (override == NULL)
return;
/* Copy env_const because strtok() is destructive. */
env = strdup(override);
if (env == NULL)
return;
for (field = strtok(env, " "); field!= NULL; field = strtok(NULL, " ")) {
GLboolean enable;
switch (field[0]) {
case '+':
enable = GL_TRUE;
++field;
break;
case '-':
enable = GL_FALSE;
++field;
break;
default:
enable = GL_TRUE;
break;
}
ext = find_extension(ext_list, field, strlen(field));
if (ext) {
if (enable)
SET_BIT(force_enable, ext->bit);
else
SET_BIT(force_disable, ext->bit);
} else {
fprintf(stderr, "WARNING: Trying to %s the unknown extension '%s'\n",
enable ? "enable" : "disable", field);
}
}
free(env);
}
/**
* \brief Parse the list of GLX extensions that the user wants to
* force-enable/disable by using \c override, and write the results to the
* screen's context.
*
* \param psc Pointer to GLX per-screen record.
* \param override A space-separated list of extensions to enable or disable.
* The list is processed thus:
* - Enable recognized extension names that are prefixed with '+'.
* - Disable recognized extension names that are prefixed with '-'.
* - Enable recognized extension names that are not prefixed.
*/
void
__glXParseExtensionOverride(struct glx_screen *psc, const char *override)
{
__ParseExtensionOverride(psc, known_glx_extensions, psc->glx_force_enabled,
psc->glx_force_disabled, override);
}
/**
* \brief Parse the list of GL extensions that the user wants to
* force-enable/disable by using \c override, and write the results to the
* screen's context.
*
* \param psc Pointer to GLX per-screen record.
* \param override A space-separated list of extensions to enable or disable.
* The list is processed thus:
* - Enable recognized extension names that are prefixed with '+'.
* - Disable recognized extension names that are prefixed with '-'.
* - Enable recognized extension names that are not prefixed.
*/
void
__IndirectGlParseExtensionOverride(struct glx_screen *psc, const char *override)
{
__ParseExtensionOverride(psc, known_gl_extensions, psc->gl_force_enabled,
psc->gl_force_disabled, override);
}
/**
* 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(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));
SET_BIT(client_glx_only, ARB_get_proc_address_bit);
for (i = 0; known_glx_extensions[i].name != NULL; i++) {
const unsigned bit = known_glx_extensions[i].bit;
if (known_glx_extensions[i].direct_support) {
SET_BIT(direct_glx_support, bit);
}
if (known_glx_extensions[i].direct_only) {
SET_BIT(direct_glx_only, bit);
}
}
}
}
/**
* Make sure that per-screen direct-support table is initialized.
*
* \param psc Pointer to GLX per-screen record.
*/
static void
__glXExtensionsCtrScreen(struct glx_screen * 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));
(void) memset(psc->glx_force_enabled, 0,
sizeof(psc->glx_force_enabled));
(void) memset(psc->glx_force_disabled, 0,
sizeof(psc->glx_force_disabled));
(void) memset(psc->gl_force_enabled, 0,
sizeof(psc->gl_force_enabled));
(void) memset(psc->gl_force_disabled, 0,
sizeof(psc->gl_force_disabled));
}
}
/**
* 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(struct glx_screen * 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(struct glx_context *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 *filter)
{
unsigned i;
unsigned ext_str_len;
char *ext_str;
char *point;
ext_str_len = 0;
for (i = 0; ext[i].name != NULL; i++) {
if (!filter || EXT_ENABLED(ext[i].bit, filter)) {
ext_str_len += ext[i].name_len + 1;
}
}
ext_str = malloc(ext_str_len + 1);
if (ext_str != NULL) {
point = ext_str;
for (i = 0; ext[i].name != NULL; i++) {
if (!filter || EXT_ENABLED(ext[i].bit, filter)) {
(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(Display *dpy)
{
if (__glXGLXClientExtensions == NULL) {
__glXExtensionsCtr();
__glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
NULL);
}
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.
*/
void
__glXCalculateUsableExtensions(struct glx_screen * psc,
GLboolean display_is_direct_capable)
{
unsigned char server_support[__GLX_EXT_BYTES];
unsigned char usable[__GLX_EXT_BYTES];
unsigned i;
__glXExtensionsCtr();
__glXExtensionsCtrScreen(psc);
(void) memset(server_support, 0, sizeof(server_support));
__glXProcessServerString(known_glx_extensions,
psc->serverGLXexts, server_support);
/* 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 < __GLX_EXT_BYTES; i++) {
/* Enable extensions that the client supports that only have a client-side
* component.
*/
unsigned char u = client_glx_only[i];
/* Enable extensions that are supported for direct rendering, and either
* are supported by the server or only have a direct-rendering component.
*/
u |= psc->direct_support[i] & (server_support[i] | direct_glx_only[i]);
/* Finally, apply driconf options to force some extension bits either
* enabled or disabled.
*/
u |= psc->glx_force_enabled[i];
u &= ~psc->glx_force_disabled[i];
usable[i] = u;
}
}
else {
for (i = 0; i < __GLX_EXT_BYTES; i++) {
/* Enable extensions that the client supports that only have a
* client-side component.
*/
unsigned char u = client_glx_only[i];
/* Enable extensions that the client and server both support */
u |= server_support[i];
/* Finally, apply driconf options to force some extension bits either
* enabled or disabled.
*/
u |= psc->glx_force_enabled[i];
u &= ~psc->glx_force_disabled[i];
usable[i] = u;
}
}
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.
*/
void
__glXCalculateUsableGLExtensions(struct glx_context * gc,
const char *server_string)
{
struct glx_screen *psc = gc->psc;
unsigned char server_support[__GL_EXT_BYTES];
unsigned char usable[__GL_EXT_BYTES];
unsigned i;
(void) memset(server_support, 0, sizeof(server_support));
__glXProcessServerString(known_gl_extensions, server_string,
server_support);
/* These extensions are wholly inside the client-side indirect code */
(void) memset(usable, 0, sizeof(usable));
SET_BIT(usable, GL_ARB_transpose_matrix_bit);
SET_BIT(usable, GL_EXT_draw_range_elements_bit);
SET_BIT(usable, GL_EXT_multi_draw_arrays_bit);
SET_BIT(usable, GL_SUN_multi_draw_arrays_bit);
for (i = 0; i < __GL_EXT_BYTES; i++) {
/* Usable if the server supports it, or if it's been forced on */
usable[i] = server_support[i] | psc->gl_force_enabled[i];
/* But not if it's been forced off */
usable[i] &= ~psc->gl_force_disabled[i];
}
gc->extensions = (unsigned char *)
__glXGetStringFromTable(known_gl_extensions, usable);
(void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
}
/**
* 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)
{
return __glXGetStringFromTable(known_gl_extensions, NULL);
}
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