+++ /dev/null
-/*
- * 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;
-}
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