mirror of
https://github.com/reactos/reactos.git
synced 2024-07-08 21:55:08 +00:00
624 lines
21 KiB
C
624 lines
21 KiB
C
/*
|
|
* Mesa 3-D graphics library
|
|
* Version: 7.6
|
|
*
|
|
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
|
|
* Copyright (C) 2009 VMware, Inc. 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
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* BRIAN PAUL 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
|
|
* \brief Extension handling
|
|
*/
|
|
|
|
#include <precomp.h>
|
|
|
|
#define ALIGN(value, alignment) (((value) + alignment - 1) & ~(alignment - 1))
|
|
|
|
/**
|
|
* \brief An element of the \c extension_table.
|
|
*/
|
|
struct extension {
|
|
/** Name of extension, such as "GL_ARB_depth_clamp". */
|
|
const char *name;
|
|
|
|
/** Offset (in bytes) of the corresponding member in struct gl_extensions. */
|
|
size_t offset;
|
|
|
|
/** Year the extension was proposed or approved. Used to sort the
|
|
* extension string chronologically. */
|
|
uint16_t year;
|
|
};
|
|
|
|
|
|
/**
|
|
* Given a member \c x of struct gl_extensions, return offset of
|
|
* \c x in bytes.
|
|
*/
|
|
#define o(x) offsetof(struct gl_extensions, x)
|
|
|
|
|
|
/**
|
|
* \brief Table of supported OpenGL extensions for all API's.
|
|
*/
|
|
static const struct extension extension_table[] = {
|
|
/* ARB Extensions */
|
|
{ "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), 2008 },
|
|
{ "GL_ARB_multisample", o(dummy_true), 1994 },
|
|
{ "GL_ARB_point_parameters", o(EXT_point_parameters), 1997 },
|
|
{ "GL_ARB_point_sprite", o(ARB_point_sprite), 2003 },
|
|
{ "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), 1999 },
|
|
{ "GL_ARB_texture_env_add", o(dummy_true), 1999 },
|
|
{ "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), 2001 },
|
|
{ "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), 2001 },
|
|
{ "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), 2001 },
|
|
{ "GL_ARB_texture_mirrored_repeat", o(dummy_true), 2001 },
|
|
{ "GL_ARB_texture_storage", o(ARB_texture_storage), 2011 },
|
|
{ "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), 1999 },
|
|
{ "GL_ARB_vertex_buffer_object", o(dummy_true), 2003 },
|
|
{ "GL_ARB_window_pos", o(ARB_window_pos), 2001 },
|
|
/* EXT extensions */
|
|
{ "GL_EXT_abgr", o(dummy_true), 1995 },
|
|
{ "GL_EXT_bgra", o(dummy_true), 1995 },
|
|
{ "GL_EXT_blend_color", o(EXT_blend_color), 1995 },
|
|
{ "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), 2003 },
|
|
{ "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), 1999 },
|
|
{ "GL_EXT_blend_minmax", o(EXT_blend_minmax), 1995 },
|
|
{ "GL_EXT_blend_subtract", o(dummy_true), 1995 },
|
|
{ "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), 1996 },
|
|
{ "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), 1996 },
|
|
{ "GL_EXT_copy_texture", o(dummy_true), 1995 },
|
|
{ "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), 2002 },
|
|
{ "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), 1997 },
|
|
{ "GL_EXT_fog_coord", o(EXT_fog_coord), 1999 },
|
|
{ "GL_EXT_packed_pixels", o(EXT_packed_pixels), 1997 },
|
|
{ "GL_EXT_point_parameters", o(EXT_point_parameters), 1997 },
|
|
{ "GL_EXT_polygon_offset", o(dummy_true), 1995 },
|
|
{ "GL_EXT_rescale_normal", o(EXT_rescale_normal), 1997 },
|
|
{ "GL_EXT_secondary_color", o(EXT_secondary_color), 1999 },
|
|
{ "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), 2008 },
|
|
{ "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), 1997 },
|
|
{ "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), 2002 },
|
|
{ "GL_EXT_stencil_wrap", o(dummy_true), 2002 },
|
|
{ "GL_EXT_subtexture", o(dummy_true), 1995 },
|
|
{ "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), 2001 },
|
|
{ "GL_EXT_texture_env_add", o(dummy_true), 1999 },
|
|
{ "GL_EXT_texture_env_combine", o(dummy_true), 2000 },
|
|
{ "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), 2000 },
|
|
{ "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), 1999 },
|
|
{ "GL_EXT_texture_integer", o(EXT_texture_integer), 2006 },
|
|
{ "GL_EXT_texture_object", o(dummy_true), 1995 },
|
|
{ "GL_EXT_texture", o(dummy_true), 1996 },
|
|
{ "GL_EXT_vertex_array", o(dummy_true), 1995 },
|
|
|
|
/* Vendor extensions */
|
|
{ "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), 2002 },
|
|
{ "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), 2003 },
|
|
{ "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), 2002 },
|
|
{ "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), 1998 },
|
|
{ "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), 1996 },
|
|
{ "GL_IBM_texture_mirrored_repeat", o(dummy_true), 1998 },
|
|
{ "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), 1999 },
|
|
{ "GL_MESA_pack_invert", o(MESA_pack_invert), 2002 },
|
|
{ "GL_MESA_resize_buffers", o(MESA_resize_buffers), 1999 },
|
|
{ "GL_MESA_window_pos", o(ARB_window_pos), 2000 },
|
|
{ "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), 2002 },
|
|
{ "GL_NV_blend_square", o(NV_blend_square), 1999 },
|
|
{ "GL_NV_fog_distance", o(NV_fog_distance), 2001 },
|
|
{ "GL_NV_light_max_exponent", o(NV_light_max_exponent), 1999 },
|
|
{ "GL_NV_point_sprite", o(NV_point_sprite), 2001 },
|
|
{ "GL_NV_texgen_reflection", o(NV_texgen_reflection), 1999 },
|
|
{ "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), 1999 },
|
|
|
|
{ 0, 0, 0},
|
|
};
|
|
|
|
|
|
/**
|
|
* Given an extension name, lookup up the corresponding member of struct
|
|
* gl_extensions and return that member's offset (in bytes). If the name is
|
|
* not found in the \c extension_table, return 0.
|
|
*
|
|
* \param name Name of extension.
|
|
* \return Offset of member in struct gl_extensions.
|
|
*/
|
|
static size_t
|
|
name_to_offset(const char* name)
|
|
{
|
|
const struct extension *i;
|
|
|
|
if (name == 0)
|
|
return 0;
|
|
|
|
for (i = extension_table; i->name != 0; ++i) {
|
|
if (strcmp(name, i->name) == 0)
|
|
return i->offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Extensions enabled by default.
|
|
*
|
|
* These extensions are enabled by _mesa_init_extensions().
|
|
*
|
|
* XXX: Should these defaults also apply to GLES?
|
|
*/
|
|
static const size_t default_extensions[] = {
|
|
o(ARB_transpose_matrix),
|
|
o(ARB_window_pos),
|
|
|
|
o(EXT_compiled_vertex_array),
|
|
o(EXT_draw_range_elements),
|
|
o(EXT_packed_pixels),
|
|
o(EXT_rescale_normal),
|
|
o(EXT_separate_specular_color),
|
|
|
|
/* Vendor Extensions */
|
|
o(APPLE_packed_pixels),
|
|
o(IBM_multimode_draw_arrays),
|
|
o(IBM_rasterpos_clip),
|
|
o(NV_light_max_exponent),
|
|
o(NV_texgen_reflection),
|
|
|
|
0,
|
|
};
|
|
|
|
|
|
/**
|
|
* Enable all extensions suitable for a software-only renderer.
|
|
* This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
|
|
*/
|
|
void
|
|
_mesa_enable_sw_extensions(struct gl_context *ctx)
|
|
{
|
|
ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
|
|
ctx->Extensions.ARB_point_sprite = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
|
|
/*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
|
|
ctx->Extensions.ARB_texture_storage = GL_TRUE;
|
|
ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_color = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_minmax = GL_TRUE;
|
|
ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
|
|
ctx->Extensions.EXT_fog_coord = GL_TRUE;
|
|
ctx->Extensions.EXT_point_parameters = GL_TRUE;
|
|
ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
|
|
ctx->Extensions.EXT_secondary_color = GL_TRUE;
|
|
ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
|
|
ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
|
|
/*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
|
|
ctx->Extensions.MESA_pack_invert = GL_TRUE;
|
|
ctx->Extensions.MESA_resize_buffers = GL_TRUE;
|
|
ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
|
|
ctx->Extensions.NV_blend_square = GL_TRUE;
|
|
/*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
|
|
ctx->Extensions.NV_point_sprite = GL_TRUE;
|
|
ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
|
|
/*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
|
|
}
|
|
|
|
|
|
/**
|
|
* Enable all OpenGL 1.3 features and extensions.
|
|
* A convenience function to be called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_1_3_extensions(struct gl_context *ctx)
|
|
{
|
|
ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
|
|
ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
|
|
/*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Enable all OpenGL 1.4 features and extensions.
|
|
* A convenience function to be called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_1_4_extensions(struct gl_context *ctx)
|
|
{
|
|
ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
|
|
ctx->Extensions.ARB_window_pos = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_color = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_minmax = GL_TRUE;
|
|
ctx->Extensions.EXT_fog_coord = GL_TRUE;
|
|
ctx->Extensions.EXT_point_parameters = GL_TRUE;
|
|
ctx->Extensions.EXT_secondary_color = GL_TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* Enable all OpenGL 1.5 features and extensions.
|
|
* A convenience function to be called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_1_5_extensions(struct gl_context *ctx)
|
|
{
|
|
ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* Enable all OpenGL 2.0 features and extensions.
|
|
* A convenience function to be called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_2_0_extensions(struct gl_context *ctx)
|
|
{
|
|
ctx->Extensions.ARB_point_sprite = GL_TRUE;
|
|
ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* Enable all OpenGL 2.1 features and extensions.
|
|
* A convenience function to be called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_2_1_extensions(struct gl_context *ctx)
|
|
{
|
|
}
|
|
|
|
|
|
/**
|
|
* Either enable or disable the named extension.
|
|
* \return GL_TRUE for success, GL_FALSE if invalid extension name
|
|
*/
|
|
static GLboolean
|
|
set_extension( struct gl_context *ctx, const char *name, GLboolean state )
|
|
{
|
|
size_t offset;
|
|
|
|
if (ctx->Extensions.String) {
|
|
/* The string was already queried - can't change it now! */
|
|
_mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
|
|
return GL_FALSE;
|
|
}
|
|
|
|
offset = name_to_offset(name);
|
|
if (offset == 0) {
|
|
_mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
|
|
name);
|
|
return GL_FALSE;
|
|
} else if (offset == o(dummy_true) && state == GL_FALSE) {
|
|
_mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
|
|
"%s", name);
|
|
return GL_FALSE;
|
|
} else {
|
|
GLboolean *base = (GLboolean *) &ctx->Extensions;
|
|
base[offset] = state;
|
|
return GL_TRUE;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Enable the named extension.
|
|
* Typically called by drivers.
|
|
*/
|
|
void
|
|
_mesa_enable_extension( struct gl_context *ctx, const char *name )
|
|
{
|
|
if (!set_extension(ctx, name, GL_TRUE))
|
|
_mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
|
|
}
|
|
|
|
|
|
/**
|
|
* Disable the named extension.
|
|
* XXX is this really needed???
|
|
*/
|
|
void
|
|
_mesa_disable_extension( struct gl_context *ctx, const char *name )
|
|
{
|
|
if (!set_extension(ctx, name, GL_FALSE))
|
|
_mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
|
|
}
|
|
|
|
|
|
/**
|
|
* Test if the named extension is enabled in this context.
|
|
*/
|
|
GLboolean
|
|
_mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
|
|
{
|
|
size_t offset;
|
|
GLboolean *base;
|
|
|
|
if (name == 0)
|
|
return GL_FALSE;
|
|
|
|
offset = name_to_offset(name);
|
|
if (offset == 0)
|
|
return GL_FALSE;
|
|
base = (GLboolean *) &ctx->Extensions;
|
|
return base[offset];
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
|
|
*
|
|
* \c MESA_EXTENSION_OVERRIDE is 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.
|
|
* - Collect unrecognized extension names in a new string.
|
|
*
|
|
* \return Space-separated list of unrecognized extension names (which must
|
|
* be freed). Does not return \c NULL.
|
|
*/
|
|
static char *
|
|
get_extension_override( struct gl_context *ctx )
|
|
{
|
|
const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
|
|
char *env;
|
|
char *ext;
|
|
char *extra_exts;
|
|
int len;
|
|
|
|
if (env_const == NULL) {
|
|
/* Return the empty string rather than NULL. This simplifies the logic
|
|
* of client functions. */
|
|
return calloc(4, sizeof(char));
|
|
}
|
|
|
|
/* extra_exts: List of unrecognized extensions. */
|
|
extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
|
|
|
|
/* Copy env_const because strtok() is destructive. */
|
|
env = _strdup(env_const);
|
|
for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
|
|
int enable;
|
|
int recognized;
|
|
switch (ext[0]) {
|
|
case '+':
|
|
enable = 1;
|
|
++ext;
|
|
break;
|
|
case '-':
|
|
enable = 0;
|
|
++ext;
|
|
break;
|
|
default:
|
|
enable = 1;
|
|
break;
|
|
}
|
|
recognized = set_extension(ctx, ext, enable);
|
|
if (!recognized) {
|
|
strcat(extra_exts, ext);
|
|
strcat(extra_exts, " ");
|
|
}
|
|
}
|
|
|
|
free(env);
|
|
|
|
/* Remove trailing space. */
|
|
len = strlen(extra_exts);
|
|
if (extra_exts[len - 1] == ' ')
|
|
extra_exts[len - 1] = '\0';
|
|
|
|
return extra_exts;
|
|
}
|
|
|
|
|
|
/**
|
|
* \brief Initialize extension tables and enable default extensions.
|
|
*
|
|
* This should be called during context initialization.
|
|
* Note: Sets gl_extensions.dummy_true to true.
|
|
*/
|
|
void
|
|
_mesa_init_extensions( struct gl_context *ctx )
|
|
{
|
|
GLboolean *base = (GLboolean *) &ctx->Extensions;
|
|
GLboolean *sentinel = base + o(extension_sentinel);
|
|
GLboolean *i;
|
|
const size_t *j;
|
|
|
|
/* First, turn all extensions off. */
|
|
for (i = base; i != sentinel; ++i)
|
|
*i = GL_FALSE;
|
|
|
|
/* Then, selectively turn default extensions on. */
|
|
ctx->Extensions.dummy_true = GL_TRUE;
|
|
for (j = default_extensions; *j != 0; ++j)
|
|
base[*j] = GL_TRUE;
|
|
}
|
|
|
|
|
|
typedef unsigned short extension_index;
|
|
|
|
|
|
/**
|
|
* Compare two entries of the extensions table. Sorts first by year,
|
|
* then by name.
|
|
*
|
|
* Arguments are indices into extension_table.
|
|
*/
|
|
static int
|
|
extension_compare(const void *p1, const void *p2)
|
|
{
|
|
extension_index i1 = * (const extension_index *) p1;
|
|
extension_index i2 = * (const extension_index *) p2;
|
|
const struct extension *e1 = &extension_table[i1];
|
|
const struct extension *e2 = &extension_table[i2];
|
|
int res;
|
|
|
|
res = (int)e1->year - (int)e2->year;
|
|
|
|
if (res == 0) {
|
|
res = strcmp(e1->name, e2->name);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* Construct the GL_EXTENSIONS string. Called the first time that
|
|
* glGetString(GL_EXTENSIONS) is called.
|
|
*/
|
|
GLubyte*
|
|
_mesa_make_extension_string(struct gl_context *ctx)
|
|
{
|
|
/* The extension string. */
|
|
char *exts = 0;
|
|
/* Length of extension string. */
|
|
size_t length = 0;
|
|
/* Number of extensions */
|
|
unsigned count;
|
|
/* Indices of the extensions sorted by year */
|
|
extension_index *extension_indices;
|
|
/* String of extra extensions. */
|
|
char *extra_extensions = get_extension_override(ctx);
|
|
GLboolean *base = (GLboolean *) &ctx->Extensions;
|
|
const struct extension *i;
|
|
unsigned j;
|
|
unsigned maxYear = ~0;
|
|
|
|
/* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
|
|
{
|
|
const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
|
|
if (env) {
|
|
maxYear = atoi(env);
|
|
_mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
|
|
maxYear);
|
|
}
|
|
}
|
|
|
|
/* Compute length of the extension string. */
|
|
count = 0;
|
|
for (i = extension_table; i->name != 0; ++i) {
|
|
if (base[i->offset] &&
|
|
i->year <= maxYear) {
|
|
length += strlen(i->name) + 1; /* +1 for space */
|
|
++count;
|
|
}
|
|
}
|
|
if (extra_extensions != NULL)
|
|
length += 1 + strlen(extra_extensions); /* +1 for space */
|
|
|
|
exts = (char *) calloc(ALIGN(length + 1, 4), sizeof(char));
|
|
if (exts == NULL) {
|
|
free(extra_extensions);
|
|
return NULL;
|
|
}
|
|
|
|
extension_indices = malloc(count * sizeof(extension_index));
|
|
if (extension_indices == NULL) {
|
|
free(exts);
|
|
free(extra_extensions);
|
|
return NULL;
|
|
}
|
|
|
|
/* Sort extensions in chronological order because certain old applications (e.g.,
|
|
* Quake3 demo) store the extension list in a static size buffer so chronologically
|
|
* order ensure that the extensions that such applications expect will fit into
|
|
* that buffer.
|
|
*/
|
|
j = 0;
|
|
for (i = extension_table; i->name != 0; ++i) {
|
|
if (base[i->offset] &&
|
|
i->year <= maxYear) {
|
|
extension_indices[j++] = i - extension_table;
|
|
}
|
|
}
|
|
assert(j == count);
|
|
qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
|
|
|
|
/* Build the extension string.*/
|
|
for (j = 0; j < count; ++j) {
|
|
i = &extension_table[extension_indices[j]];
|
|
assert(base[i->offset]);
|
|
strcat(exts, i->name);
|
|
strcat(exts, " ");
|
|
}
|
|
free(extension_indices);
|
|
if (extra_extensions != 0) {
|
|
strcat(exts, extra_extensions);
|
|
free(extra_extensions);
|
|
}
|
|
|
|
return (GLubyte *) exts;
|
|
}
|
|
|
|
/**
|
|
* Return number of enabled extensions.
|
|
*/
|
|
GLuint
|
|
_mesa_get_extension_count(struct gl_context *ctx)
|
|
{
|
|
GLboolean *base;
|
|
const struct extension *i;
|
|
|
|
/* only count once */
|
|
if (ctx->Extensions.Count != 0)
|
|
return ctx->Extensions.Count;
|
|
|
|
base = (GLboolean *) &ctx->Extensions;
|
|
for (i = extension_table; i->name != 0; ++i) {
|
|
if (base[i->offset]) {
|
|
ctx->Extensions.Count++;
|
|
}
|
|
}
|
|
return ctx->Extensions.Count;
|
|
}
|
|
|
|
/**
|
|
* Return name of i-th enabled extension
|
|
*/
|
|
const GLubyte *
|
|
_mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
|
|
{
|
|
const GLboolean *base;
|
|
size_t n;
|
|
const struct extension *i;
|
|
|
|
if (index < 0)
|
|
return NULL;
|
|
|
|
base = (GLboolean*) &ctx->Extensions;
|
|
n = 0;
|
|
for (i = extension_table; i->name != 0; ++i) {
|
|
if (n == index && base[i->offset]) {
|
|
return (GLubyte*) i->name;
|
|
} else if (base[i->offset]) {
|
|
++n;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|