/* * Mesa 3-D graphics library * * 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 * THE AUTHORS OR COPYRIGHT HOLDERS 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 "glheader.h" #include "util/imports.h" #include "context.h" #include "extensions.h" #include "macros.h" #include "mtypes.h" struct gl_extensions _mesa_extension_override_enables; struct gl_extensions _mesa_extension_override_disables; static char *unrecognized_extensions = NULL; /** * Given a member \c x of struct gl_extensions, return offset of * \c x in bytes. */ #define o(x) offsetof(struct gl_extensions, x) static int extension_name_compare(const void *name, const void *elem) { const struct mesa_extension *entry = elem; return strcmp(name, entry->name); } /** * Given an extension name, lookup up the corresponding member of struct * gl_extensions and return that member's index. If the name is * not found in the \c _mesa_extension_table, return -1. * * \param name Name of extension. * \return Index of member in struct gl_extensions. */ static int name_to_index(const char* name) { const struct mesa_extension *entry; if (!name) return -1; entry = bsearch(name, _mesa_extension_table, MESA_EXTENSION_COUNT, sizeof(_mesa_extension_table[0]), extension_name_compare); if (entry) return entry - _mesa_extension_table; return -1; } /** * Overrides extensions in \c ctx based on the values in * _mesa_extension_override_enables and _mesa_extension_override_disables. */ void _mesa_override_extensions(struct gl_context *ctx) { unsigned i; const GLboolean *enables = (GLboolean*) &_mesa_extension_override_enables; const GLboolean *disables = (GLboolean*) &_mesa_extension_override_disables; GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions; for (i = 0; i < MESA_EXTENSION_COUNT; ++i) { size_t offset = _mesa_extension_table[i].offset; assert(!enables[offset] || !disables[offset]); if (enables[offset]) { ctx_ext[offset] = 1; } else if (disables[offset]) { ctx_ext[offset] = 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_depth_clamp = GL_TRUE; ctx->Extensions.ARB_depth_texture = GL_TRUE; ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE; ctx->Extensions.ARB_draw_instanced = GL_TRUE; ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE; ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE; ctx->Extensions.ARB_fragment_program = GL_TRUE; ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE; ctx->Extensions.ARB_fragment_shader = GL_TRUE; ctx->Extensions.ARB_framebuffer_object = GL_TRUE; ctx->Extensions.ARB_half_float_vertex = GL_TRUE; ctx->Extensions.ARB_map_buffer_range = GL_TRUE; ctx->Extensions.ARB_occlusion_query = GL_TRUE; ctx->Extensions.ARB_occlusion_query2 = GL_TRUE; ctx->Extensions.ARB_point_sprite = GL_TRUE; ctx->Extensions.ARB_shadow = GL_TRUE; ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; ctx->Extensions.ARB_texture_compression_bptc = 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_filter_anisotropic = GL_TRUE; ctx->Extensions.ARB_texture_float = GL_TRUE; ctx->Extensions.ARB_texture_mirror_clamp_to_edge = GL_TRUE; ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; ctx->Extensions.ARB_texture_rg = GL_TRUE; ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE; ctx->Extensions.ARB_vertex_program = GL_TRUE; ctx->Extensions.ARB_vertex_shader = GL_TRUE; ctx->Extensions.ARB_sync = GL_TRUE; ctx->Extensions.APPLE_object_purgeable = GL_TRUE; ctx->Extensions.ATI_fragment_shader = GL_TRUE; ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE; ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE; ctx->Extensions.ATI_texture_mirror_once = 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_draw_buffers2 = GL_TRUE; ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; ctx->Extensions.EXT_point_parameters = GL_TRUE; ctx->Extensions.EXT_provoking_vertex = GL_TRUE; ctx->Extensions.EXT_stencil_two_side = GL_TRUE; ctx->Extensions.EXT_texture_array = GL_TRUE; ctx->Extensions.EXT_texture_compression_latc = GL_TRUE; ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE; ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE; ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE; ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE; ctx->Extensions.EXT_texture_sRGB = GL_TRUE; ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE; ctx->Extensions.EXT_texture_swizzle = GL_TRUE; /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/ ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE; ctx->Extensions.MESA_pack_invert = GL_TRUE; ctx->Extensions.MESA_ycbcr_texture = GL_TRUE; ctx->Extensions.NV_conditional_render = GL_TRUE; ctx->Extensions.NV_point_sprite = GL_TRUE; ctx->Extensions.NV_texture_env_combine4 = GL_TRUE; ctx->Extensions.NV_texture_rectangle = GL_TRUE; ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE; ctx->Extensions.OES_standard_derivatives = GL_TRUE; ctx->Extensions.TDFX_texture_compression_FXT1 = GL_TRUE; ctx->Extensions.ANGLE_texture_compression_dxt = GL_TRUE; ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE; } /** * Either enable or disable the named extension. * \return offset of extensions withint `ext' or 0 if extension is not known */ static size_t set_extension(struct gl_extensions *ext, int i, GLboolean state) { size_t offset; offset = i < 0 ? 0 : _mesa_extension_table[i].offset; if (offset != 0 && (offset != o(dummy_true) || state != GL_FALSE)) { ((GLboolean *) ext)[offset] = state; } return offset; } /** * \brief Free string pointed by unrecognized_extensions * * This string is allocated early during the first context creation by * _mesa_one_time_init_extension_overrides. */ static void free_unknown_extensions_strings(void) { free(unrecognized_extensions); } /** * \brief Initialize extension override tables based on \c MESA_EXTENSION_OVERRIDE * * This should be called one time early during first context initialization. * \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. */ void _mesa_one_time_init_extension_overrides(struct gl_context *ctx) { const char *env_const = getenv("MESA_EXTENSION_OVERRIDE"); char *env; char *ext; size_t offset; unsigned unknown_ext = 0; memset(&_mesa_extension_override_enables, 0, sizeof(struct gl_extensions)); memset(&_mesa_extension_override_disables, 0, sizeof(struct gl_extensions)); if (env_const == NULL) { return; } /* Copy env_const because strtok() is destructive. */ env = strdup(env_const); if (env == NULL) return; for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) { int enable; int i; bool recognized; switch (ext[0]) { case '+': enable = 1; ++ext; break; case '-': enable = 0; ++ext; break; default: enable = 1; break; } i = name_to_index(ext); offset = set_extension(&_mesa_extension_override_enables, i, enable); offset = set_extension(&_mesa_extension_override_disables, i, !enable); if (offset != 0) recognized = true; else recognized = false; if (!recognized && enable) { if (unknown_ext >= MAX_UNRECOGNIZED_EXTENSIONS) { static bool warned; if (!warned) { warned = true; _mesa_problem(ctx, "Trying to enable too many unknown extension. " "Only the first %d will be honoured", MAX_UNRECOGNIZED_EXTENSIONS); } } else { ctx->Extensions.unrecognized_extensions[unknown_ext] = ext; unknown_ext++; _mesa_problem(ctx, "Trying to enable unknown extension: %s", ext); } } } if (!unknown_ext) { free(env); } else { unrecognized_extensions = env; atexit(free_unknown_extensions_strings); } } /** * \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_extensions *extensions) { GLboolean *base = (GLboolean *) extensions; GLboolean *sentinel = base + o(extension_sentinel); GLboolean *i; /* First, turn all extensions off. */ for (i = base; i != sentinel; ++i) *i = GL_FALSE; /* Then, selectively turn default extensions on. */ extensions->dummy_true = GL_TRUE; } typedef unsigned short extension_index; /** * Given an extension enum, return whether or not the extension is supported * dependent on the following factors: * There's driver support and the OpenGL/ES version is at least that * specified in the _mesa_extension_table. */ static inline bool _mesa_extension_supported(const struct gl_context *ctx, extension_index i) { const bool *base = (bool *) &ctx->Extensions; const struct mesa_extension *ext = _mesa_extension_table + i; return (ctx->Version >= ext->version[ctx->API]) && base[ext->offset]; } /** * Compare two entries of the extensions table. Sorts first by year, * then by name. * * Arguments are indices into _mesa_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 mesa_extension *e1 = &_mesa_extension_table[i1]; const struct mesa_extension *e2 = &_mesa_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[MESA_EXTENSION_COUNT]; unsigned k; 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 (k = 0; k < MESA_EXTENSION_COUNT; ++k) { const struct mesa_extension *i = _mesa_extension_table + k; if (i->year <= maxYear && _mesa_extension_supported(ctx, k)) { length += strlen(i->name) + 1; /* +1 for space */ ++count; } } for (k = 0; k < MAX_UNRECOGNIZED_EXTENSIONS; k++) if (ctx->Extensions.unrecognized_extensions[k]) length += 1 + strlen(ctx->Extensions.unrecognized_extensions[k]); /* +1 for space */ exts = calloc(ALIGN(length + 1, 4), sizeof(char)); if (exts == NULL) { return NULL; } /* Sort extensions in chronological order because idTech 2/3 games * (e.g., Quake3 demo) store the extension list in a fixed size buffer. * Some cases truncate, while others overflow the buffer. Resulting in * misrendering and crashes, respectively. * Address the former here, while the latter will be addressed by setting * the MESA_EXTENSION_MAX_YEAR environment variable. */ j = 0; for (k = 0; k < MESA_EXTENSION_COUNT; ++k) { if (_mesa_extension_table[k].year <= maxYear && _mesa_extension_supported(ctx, k)) { extension_indices[j++] = k; } } assert(j == count); qsort(extension_indices, count, sizeof *extension_indices, extension_compare); /* Build the extension string.*/ for (j = 0; j < count; ++j) { const struct mesa_extension *i = &_mesa_extension_table[extension_indices[j]]; assert(_mesa_extension_supported(ctx, extension_indices[j])); strcat(exts, i->name); strcat(exts, " "); } for (j = 0; j < MAX_UNRECOGNIZED_EXTENSIONS; j++) { if (ctx->Extensions.unrecognized_extensions[j]) { strcat(exts, ctx->Extensions.unrecognized_extensions[j]); strcat(exts, " "); } } return (GLubyte *) exts; } /** * Return number of enabled extensions. */ GLuint _mesa_get_extension_count(struct gl_context *ctx) { unsigned k; /* only count once */ if (ctx->Extensions.Count != 0) return ctx->Extensions.Count; for (k = 0; k < MESA_EXTENSION_COUNT; ++k) { if (_mesa_extension_supported(ctx, k)) ctx->Extensions.Count++; } for (k = 0; k < MAX_UNRECOGNIZED_EXTENSIONS; ++k) { if (ctx->Extensions.unrecognized_extensions[k]) 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) { size_t n = 0; unsigned i; for (i = 0; i < MESA_EXTENSION_COUNT; ++i) { if (_mesa_extension_supported(ctx, i)) { if (n == index) return (const GLubyte*) _mesa_extension_table[i].name; else ++n; } } for (i = 0; i < MAX_UNRECOGNIZED_EXTENSIONS; ++i) { if (ctx->Extensions.unrecognized_extensions[i]) { if (n == index) return (const GLubyte*) ctx->Extensions.unrecognized_extensions[i]; else ++n; } } return NULL; }