extensions.c revision 3464ebd5
1/* 2 * Mesa 3-D graphics library 3 * Version: 7.6 4 * 5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved. 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a 9 * copy of this software and associated documentation files (the "Software"), 10 * to deal in the Software without restriction, including without limitation 11 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 12 * and/or sell copies of the Software, and to permit persons to whom the 13 * Software is furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included 16 * in all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 27/** 28 * \file 29 * \brief Extension handling 30 */ 31 32 33#include "glheader.h" 34#include "imports.h" 35#include "context.h" 36#include "extensions.h" 37#include "mfeatures.h" 38#include "mtypes.h" 39 40enum { 41 DISABLE = 0, 42 GL = 1 << API_OPENGL, 43 ES1 = 1 << API_OPENGLES, 44 ES2 = 1 << API_OPENGLES2, 45}; 46 47/** 48 * \brief An element of the \c extension_table. 49 */ 50struct extension { 51 /** Name of extension, such as "GL_ARB_depth_clamp". */ 52 const char *name; 53 54 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */ 55 size_t offset; 56 57 /** Set of API's in which the extension exists, as a bitset. */ 58 uint8_t api_set; 59 60 /** Year the extension was proposed or approved. Used to sort the 61 * extension string chronologically. */ 62 uint16_t year; 63}; 64 65 66/** 67 * Given a member \c x of struct gl_extensions, return offset of 68 * \c x in bytes. 69 */ 70#define o(x) offsetof(struct gl_extensions, x) 71 72 73/** 74 * \brief Table of supported OpenGL extensions for all API's. 75 * 76 * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions. 77 */ 78static const struct extension extension_table[] = { 79 /* ARB Extensions */ 80 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 }, 81 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 }, 82 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 }, 83 { "GL_ARB_copy_buffer", o(ARB_copy_buffer), GL, 2008 }, 84 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 }, 85 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 }, 86 { "GL_ARB_depth_texture", o(ARB_depth_texture), GL, 2001 }, 87 { "GL_ARB_draw_buffers", o(ARB_draw_buffers), GL, 2002 }, 88 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 }, 89 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 }, 90 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 }, 91 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 }, 92 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 }, 93 { "GL_ARB_fragment_program", o(ARB_fragment_program), GL, 2002 }, 94 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GL, 2003 }, 95 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 }, 96 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 }, 97 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 }, 98 { "GL_ARB_half_float_pixel", o(ARB_half_float_pixel), GL, 2003 }, 99 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 }, 100 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 }, 101 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 }, 102 { "GL_ARB_multisample", o(ARB_multisample), GL, 1994 }, 103 { "GL_ARB_multitexture", o(ARB_multitexture), GL, 1998 }, 104 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 }, 105 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GL, 2001 }, 106 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 }, 107 { "GL_ARB_point_parameters", o(EXT_point_parameters), GL, 1997 }, 108 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 }, 109 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 }, 110 { "GL_ARB_robustness", o(dummy_true), GL, 2010 }, 111 { "GL_ARB_sampler_objects", o(ARB_sampler_objects), GL, 2009 }, 112 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 }, 113 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 }, 114 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 }, 115 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 }, 116 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GL, 2003 }, 117 { "GL_ARB_shadow_ambient", o(ARB_shadow_ambient), GL, 2001 }, 118 { "GL_ARB_shadow", o(ARB_shadow), GL, 2001 }, 119 { "GL_ARB_sync", o(ARB_sync), GL, 2003 }, 120 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GL, 2000 }, 121 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 }, 122 { "GL_ARB_texture_compression", o(ARB_texture_compression), GL, 2000 }, 123 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 }, 124 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GL, 1999 }, 125 { "GL_ARB_texture_env_add", o(EXT_texture_env_add), GL, 1999 }, 126 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GL, 2001 }, 127 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GL, 2001 }, 128 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GL, 2001 }, 129 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 }, 130 { "GL_ARB_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 2001 }, 131 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 }, 132 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 }, 133 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 }, 134 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 }, 135 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 }, 136 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 }, 137 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 }, 138 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GL, 1999 }, 139 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2002 }, 140 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 }, 141 { "GL_ARB_vertex_array_object", o(ARB_vertex_array_object), GL, 2006 }, 142 { "GL_ARB_vertex_buffer_object", o(ARB_vertex_buffer_object), GL, 2003 }, 143 { "GL_ARB_vertex_program", o(ARB_vertex_program), GL, 2002 }, 144 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 }, 145 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 }, 146 { "GL_ARB_window_pos", o(ARB_window_pos), GL, 2001 }, 147 /* EXT extensions */ 148 { "GL_EXT_abgr", o(EXT_abgr), GL, 1995 }, 149 { "GL_EXT_bgra", o(EXT_bgra), GL, 1995 }, 150 { "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 }, 151 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 }, 152 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 }, 153 { "GL_EXT_blend_logic_op", o(EXT_blend_logic_op), GL, 1995 }, 154 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 }, 155 { "GL_EXT_blend_subtract", o(EXT_blend_subtract), GL, 1995 }, 156 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 }, 157 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GL, 1996 }, 158 { "GL_EXT_copy_texture", o(EXT_copy_texture), GL, 1995 }, 159 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 }, 160 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 }, 161 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 }, 162 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GL, 1997 }, 163 { "GL_EXT_fog_coord", o(EXT_fog_coord), GL, 1999 }, 164 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 }, 165 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 }, 166 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 }, 167 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 }, 168 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GL, 2006 }, 169 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 }, 170 { "GL_EXT_multi_draw_arrays", o(EXT_multi_draw_arrays), GL | ES1 | ES2, 1999 }, 171 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 }, 172 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 }, 173 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GL, 1997 }, 174 { "GL_EXT_paletted_texture", o(EXT_paletted_texture), GL, 1995 }, 175 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 }, 176 { "GL_EXT_point_parameters", o(EXT_point_parameters), GL, 1997 }, 177 { "GL_EXT_polygon_offset", o(EXT_polygon_offset), GL, 1995 }, 178 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 }, 179 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GL, 1997 }, 180 { "GL_EXT_secondary_color", o(EXT_secondary_color), GL, 1999 }, 181 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GL, 2008 }, 182 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GL, 1997 }, 183 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GL, 2002 }, 184 { "GL_EXT_shared_texture_palette", o(EXT_shared_texture_palette), GL, 2000 }, 185 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GL, 2001 }, 186 { "GL_EXT_stencil_wrap", o(EXT_stencil_wrap), GL, 2002 }, 187 { "GL_EXT_subtexture", o(EXT_subtexture), GL, 1995 }, 188 { "GL_EXT_texture3D", o(EXT_texture3D), GL, 1996 }, 189 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 }, 190 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 }, 191 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 }, 192 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 }, 193 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 }, 194 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GL, 2001 }, 195 { "GL_EXT_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 }, 196 { "GL_EXT_texture_env_add", o(EXT_texture_env_add), GL, 1999 }, 197 { "GL_EXT_texture_env_combine", o(EXT_texture_env_combine), GL, 2006 }, 198 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GL, 2000 }, 199 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 }, 200 { "GL_EXT_texture_format_BGRA8888", o(EXT_texture_format_BGRA8888), ES1 | ES2, 2009 }, 201 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 }, 202 { "GL_EXT_texture_lod_bias", o(EXT_texture_lod_bias), GL | ES1, 1999 }, 203 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 }, 204 { "GL_EXT_texture_object", o(EXT_texture_object), GL, 1995 }, 205 { "GL_EXT_texture", o(EXT_texture), GL, 1996 }, 206 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GL, 2004 }, 207 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 }, 208 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 }, 209 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 }, 210 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 }, 211 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 }, 212 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 }, 213 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 }, 214 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 }, 215 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 }, 216 { "GL_EXT_vertex_array", o(EXT_vertex_array), GL, 1995 }, 217 { "GL_EXT_vertex_array_set", o(EXT_vertex_array_set), GL, 1997 }, 218 219 /* OES extensions */ 220 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 }, 221 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 }, 222 { "GL_OES_blend_subtract", o(EXT_blend_subtract), ES1, 2009 }, 223 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 }, 224 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 }, 225 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 226 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 }, 227 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 }, 228#if FEATURE_OES_draw_texture 229 { "GL_OES_draw_texture", o(OES_draw_texture), ES1 | ES2, 2004 }, 230#endif 231#if FEATURE_OES_EGL_image 232 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */ 233 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 }, 234#endif 235 { "GL_OES_element_index_uint", o(EXT_vertex_array), ES1 | ES2, 2005 }, 236 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 237 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 }, 238 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 }, 239 { "GL_OES_mapbuffer", o(ARB_vertex_buffer_object), ES1 | ES2, 2005 }, 240 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 }, 241 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 }, 242 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 }, 243 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 }, 244 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 }, 245 { "GL_OES_read_format", o(OES_read_format), GL | ES1, 2003 }, 246 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 247 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 }, 248 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 }, 249 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 }, 250 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 }, 251 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 252 { "GL_OES_stencil_wrap", o(EXT_stencil_wrap), ES1, 2002 }, 253 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 }, 254 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 }, 255 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 }, 256 { "GL_OES_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), ES1, 2005 }, 257 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 }, 258 259 /* Vendor extensions */ 260 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 }, 261 { "GL_AMD_conservative_depth", o(AMD_conservative_depth), GL, 2009 }, 262 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 }, 263 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 }, 264 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 }, 265 { "GL_APPLE_client_storage", o(APPLE_client_storage), GL, 2002 }, 266 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 }, 267 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GL, 2002 }, 268 { "GL_APPLE_vertex_array_object", o(APPLE_vertex_array_object), GL, 2002 }, 269 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 }, 270 { "GL_ATI_draw_buffers", o(ARB_draw_buffers), GL, 2002 }, 271 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GL, 2001 }, 272 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GL, 2001 }, 273 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GL, 2006 }, 274 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 }, 275 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GL, 2002 }, 276 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 }, 277 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 }, 278 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 }, 279 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 }, 280 { "GL_IBM_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 1998 }, 281 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 }, 282 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 }, 283 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 }, 284 { "GL_MESA_texture_array", o(MESA_texture_array), GL, 2007 }, 285 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 }, 286 { "GL_MESA_window_pos", o(ARB_window_pos), GL, 2000 }, 287 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 }, 288 { "GL_NV_blend_square", o(NV_blend_square), GL, 1999 }, 289 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 }, 290 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 }, 291 { "GL_NV_fragment_program", o(NV_fragment_program), GL, 2001 }, 292 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GL, 2005 }, 293 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GL, 1999 }, 294 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 }, 295 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 }, 296 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 }, 297 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GL, 1999 }, 298 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 }, 299 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GL, 1999 }, 300 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GL, 2000 }, 301 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GL, 2001 }, 302 { "GL_NV_vertex_program", o(NV_vertex_program), GL, 2000 }, 303 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 }, 304 { "GL_SGIS_generate_mipmap", o(SGIS_generate_mipmap), GL, 1997 }, 305 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GL, 1997 }, 306 { "GL_SGIS_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 }, 307 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GL, 1997 }, 308 { "GL_SUN_multi_draw_arrays", o(EXT_multi_draw_arrays), GL, 1999 }, 309 310 { 0, 0, 0, 0 }, 311}; 312 313 314/** 315 * Given an extension name, lookup up the corresponding member of struct 316 * gl_extensions and return that member's offset (in bytes). If the name is 317 * not found in the \c extension_table, return 0. 318 * 319 * \param name Name of extension. 320 * \return Offset of member in struct gl_extensions. 321 */ 322static size_t 323name_to_offset(const char* name) 324{ 325 const struct extension *i; 326 327 if (name == 0) 328 return 0; 329 330 for (i = extension_table; i->name != 0; ++i) { 331 if (strcmp(name, i->name) == 0) 332 return i->offset; 333 } 334 335 return 0; 336} 337 338 339/** 340 * \brief Extensions enabled by default. 341 * 342 * These extensions are enabled by _mesa_init_extensions(). 343 * 344 * XXX: Should these defaults also apply to GLES? 345 */ 346static const size_t default_extensions[] = { 347 o(ARB_copy_buffer), 348 o(ARB_draw_buffers), 349 o(ARB_multisample), 350 o(ARB_texture_compression), 351 o(ARB_transpose_matrix), 352 o(ARB_vertex_buffer_object), 353 o(ARB_window_pos), 354 355 o(EXT_abgr), 356 o(EXT_bgra), 357 o(EXT_compiled_vertex_array), 358 o(EXT_copy_texture), 359 o(EXT_draw_range_elements), 360 o(EXT_multi_draw_arrays), 361 o(EXT_packed_pixels), 362 o(EXT_polygon_offset), 363 o(EXT_rescale_normal), 364 o(EXT_separate_specular_color), 365 o(EXT_subtexture), 366 o(EXT_texture), 367 o(EXT_texture3D), 368 o(EXT_texture_object), 369 o(EXT_vertex_array), 370 371 o(OES_read_format), 372 o(OES_standard_derivatives), 373 374 /* Vendor Extensions */ 375 o(APPLE_packed_pixels), 376 o(IBM_multimode_draw_arrays), 377 o(IBM_rasterpos_clip), 378 o(NV_light_max_exponent), 379 o(NV_texgen_reflection), 380 o(SGIS_generate_mipmap), 381 o(SGIS_texture_edge_clamp), 382 o(SGIS_texture_lod), 383 384 0, 385}; 386 387 388/** 389 * Enable all extensions suitable for a software-only renderer. 390 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc. 391 */ 392void 393_mesa_enable_sw_extensions(struct gl_context *ctx) 394{ 395 /*ctx->Extensions.ARB_copy_buffer = GL_TRUE;*/ 396 ctx->Extensions.ARB_depth_clamp = GL_TRUE; 397 ctx->Extensions.ARB_depth_texture = GL_TRUE; 398 /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/ 399 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE; 400 ctx->Extensions.ARB_draw_instanced = GL_TRUE; 401 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE; 402 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE; 403#if FEATURE_ARB_fragment_program 404 ctx->Extensions.ARB_fragment_program = GL_TRUE; 405 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE; 406#endif 407#if FEATURE_ARB_fragment_shader 408 ctx->Extensions.ARB_fragment_shader = GL_TRUE; 409#endif 410#if FEATURE_ARB_framebuffer_object 411 ctx->Extensions.ARB_framebuffer_object = GL_TRUE; 412#endif 413#if FEATURE_ARB_geometry_shader4 && 0 414 /* XXX re-enable when GLSL compiler again supports geometry shaders */ 415 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE; 416#endif 417 ctx->Extensions.ARB_half_float_pixel = GL_TRUE; 418 ctx->Extensions.ARB_half_float_vertex = GL_TRUE; 419 ctx->Extensions.ARB_map_buffer_range = GL_TRUE; 420 ctx->Extensions.ARB_multitexture = GL_TRUE; 421#if FEATURE_queryobj 422 ctx->Extensions.ARB_occlusion_query = GL_TRUE; 423 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE; 424#endif 425 ctx->Extensions.ARB_point_sprite = GL_TRUE; 426#if FEATURE_ARB_shader_objects 427 ctx->Extensions.ARB_shader_objects = GL_TRUE; 428 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE; 429#endif 430#if FEATURE_ARB_shading_language_100 431 ctx->Extensions.ARB_shading_language_100 = GL_TRUE; 432#endif 433 ctx->Extensions.ARB_shadow = GL_TRUE; 434 ctx->Extensions.ARB_shadow_ambient = GL_TRUE; 435 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; 436 ctx->Extensions.ARB_texture_cube_map = GL_TRUE; 437 ctx->Extensions.ARB_texture_env_combine = GL_TRUE; 438 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE; 439 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE; 440 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/ 441 ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE; 442 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; 443 ctx->Extensions.ARB_texture_rg = GL_TRUE; 444 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE; 445 ctx->Extensions.ARB_vertex_array_object = GL_TRUE; 446#if FEATURE_ARB_vertex_program 447 ctx->Extensions.ARB_vertex_program = GL_TRUE; 448#endif 449#if FEATURE_ARB_vertex_shader 450 ctx->Extensions.ARB_vertex_shader = GL_TRUE; 451#endif 452#if FEATURE_ARB_vertex_buffer_object 453 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/ 454#endif 455#if FEATURE_ARB_sync 456 ctx->Extensions.ARB_sync = GL_TRUE; 457#endif 458 ctx->Extensions.APPLE_vertex_array_object = GL_TRUE; 459#if FEATURE_APPLE_object_purgeable 460 ctx->Extensions.APPLE_object_purgeable = GL_TRUE; 461#endif 462 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE; 463#if FEATURE_ATI_fragment_shader 464 ctx->Extensions.ATI_fragment_shader = GL_TRUE; 465#endif 466 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE; 467 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE; 468 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE; 469 ctx->Extensions.ATI_separate_stencil = GL_TRUE; 470 ctx->Extensions.EXT_blend_color = GL_TRUE; 471 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE; 472 ctx->Extensions.EXT_blend_func_separate = GL_TRUE; 473 ctx->Extensions.EXT_blend_logic_op = GL_TRUE; 474 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 475 ctx->Extensions.EXT_blend_subtract = GL_TRUE; 476 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE; 477 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE; 478 ctx->Extensions.EXT_fog_coord = GL_TRUE; 479#if FEATURE_EXT_framebuffer_object 480 ctx->Extensions.EXT_framebuffer_object = GL_TRUE; 481#endif 482#if FEATURE_EXT_framebuffer_blit 483 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE; 484#endif 485#if FEATURE_ARB_framebuffer_object 486 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE; 487#endif 488 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/ 489 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE; 490 ctx->Extensions.EXT_paletted_texture = GL_TRUE; 491#if FEATURE_EXT_pixel_buffer_object 492 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 493#endif 494 ctx->Extensions.EXT_point_parameters = GL_TRUE; 495 ctx->Extensions.EXT_provoking_vertex = GL_TRUE; 496 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 497 ctx->Extensions.EXT_secondary_color = GL_TRUE; 498 ctx->Extensions.EXT_shared_texture_palette = GL_TRUE; 499 ctx->Extensions.EXT_stencil_wrap = GL_TRUE; 500 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 501 ctx->Extensions.EXT_texture_array = GL_TRUE; 502 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE; 503 ctx->Extensions.EXT_texture_env_add = GL_TRUE; 504 ctx->Extensions.EXT_texture_env_combine = GL_TRUE; 505 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE; 506 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE; 507 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE; 508 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE; 509 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE; 510#if FEATURE_EXT_texture_sRGB 511 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 512 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE; 513#endif 514 ctx->Extensions.EXT_texture_swizzle = GL_TRUE; 515#if FEATURE_EXT_transform_feedback 516 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/ 517#endif 518 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE; 519 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/ 520 ctx->Extensions.MESA_pack_invert = GL_TRUE; 521 ctx->Extensions.MESA_resize_buffers = GL_TRUE; 522 ctx->Extensions.MESA_texture_array = GL_TRUE; 523 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE; 524 ctx->Extensions.NV_blend_square = GL_TRUE; 525 ctx->Extensions.NV_conditional_render = GL_TRUE; 526 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/ 527 ctx->Extensions.NV_point_sprite = GL_TRUE; 528 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE; 529 ctx->Extensions.NV_texture_rectangle = GL_TRUE; 530 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/ 531#if FEATURE_NV_vertex_program 532 ctx->Extensions.NV_vertex_program = GL_TRUE; 533 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE; 534#endif 535#if FEATURE_NV_fragment_program 536 ctx->Extensions.NV_fragment_program = GL_TRUE; 537#endif 538#if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program 539 ctx->Extensions.NV_fragment_program_option = GL_TRUE; 540#endif 541 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/ 542 ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE; 543#if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program 544 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE; 545#endif 546#if FEATURE_texture_fxt1 547 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1"); 548#endif 549#if FEATURE_texture_s3tc 550 if (ctx->Mesa_DXTn) { 551 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc"); 552 _mesa_enable_extension(ctx, "GL_S3_s3tc"); 553 } 554#endif 555} 556 557 558/** 559 * Enable common EXT extensions in the ARB_imaging subset. 560 */ 561void 562_mesa_enable_imaging_extensions(struct gl_context *ctx) 563{ 564 ctx->Extensions.EXT_blend_color = GL_TRUE; 565 ctx->Extensions.EXT_blend_logic_op = GL_TRUE; 566 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 567 ctx->Extensions.EXT_blend_subtract = GL_TRUE; 568} 569 570 571 572/** 573 * Enable all OpenGL 1.3 features and extensions. 574 * A convenience function to be called by drivers. 575 */ 576void 577_mesa_enable_1_3_extensions(struct gl_context *ctx) 578{ 579 /*ctx->Extensions.ARB_multisample = GL_TRUE;*/ 580 ctx->Extensions.ARB_multitexture = GL_TRUE; 581 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; 582 /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/ 583 ctx->Extensions.ARB_texture_cube_map = GL_TRUE; 584 ctx->Extensions.ARB_texture_env_combine = GL_TRUE; 585 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE; 586 ctx->Extensions.EXT_texture_env_add = GL_TRUE; 587 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/ 588} 589 590 591 592/** 593 * Enable all OpenGL 1.4 features and extensions. 594 * A convenience function to be called by drivers. 595 */ 596void 597_mesa_enable_1_4_extensions(struct gl_context *ctx) 598{ 599 ctx->Extensions.ARB_depth_texture = GL_TRUE; 600 ctx->Extensions.ARB_shadow = GL_TRUE; 601 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE; 602 ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE; 603 ctx->Extensions.ARB_window_pos = GL_TRUE; 604 ctx->Extensions.EXT_blend_color = GL_TRUE; 605 ctx->Extensions.EXT_blend_func_separate = GL_TRUE; 606 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 607 ctx->Extensions.EXT_blend_subtract = GL_TRUE; 608 ctx->Extensions.EXT_fog_coord = GL_TRUE; 609 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/ 610 ctx->Extensions.EXT_point_parameters = GL_TRUE; 611 ctx->Extensions.EXT_secondary_color = GL_TRUE; 612 ctx->Extensions.EXT_stencil_wrap = GL_TRUE; 613 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE; 614 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/ 615} 616 617 618/** 619 * Enable all OpenGL 1.5 features and extensions. 620 * A convenience function to be called by drivers. 621 */ 622void 623_mesa_enable_1_5_extensions(struct gl_context *ctx) 624{ 625 ctx->Extensions.ARB_occlusion_query = GL_TRUE; 626 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/ 627 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 628} 629 630 631/** 632 * Enable all OpenGL 2.0 features and extensions. 633 * A convenience function to be called by drivers. 634 */ 635void 636_mesa_enable_2_0_extensions(struct gl_context *ctx) 637{ 638 /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/ 639#if FEATURE_ARB_fragment_shader 640 ctx->Extensions.ARB_fragment_shader = GL_TRUE; 641#endif 642 ctx->Extensions.ARB_point_sprite = GL_TRUE; 643 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE; 644 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; 645#if FEATURE_ARB_shader_objects 646 ctx->Extensions.ARB_shader_objects = GL_TRUE; 647#endif 648#if FEATURE_ARB_shading_language_100 649 ctx->Extensions.ARB_shading_language_100 = GL_TRUE; 650#endif 651 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 652#if FEATURE_ARB_vertex_shader 653 ctx->Extensions.ARB_vertex_shader = GL_TRUE; 654#endif 655} 656 657 658/** 659 * Enable all OpenGL 2.1 features and extensions. 660 * A convenience function to be called by drivers. 661 */ 662void 663_mesa_enable_2_1_extensions(struct gl_context *ctx) 664{ 665#if FEATURE_EXT_pixel_buffer_object 666 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 667#endif 668#if FEATURE_EXT_texture_sRGB 669 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 670#endif 671} 672 673 674/** 675 * Either enable or disable the named extension. 676 * \return GL_TRUE for success, GL_FALSE if invalid extension name 677 */ 678static GLboolean 679set_extension( struct gl_context *ctx, const char *name, GLboolean state ) 680{ 681 size_t offset; 682 683 if (ctx->Extensions.String) { 684 /* The string was already queried - can't change it now! */ 685 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name); 686 return GL_FALSE; 687 } 688 689 offset = name_to_offset(name); 690 if (offset == 0) { 691 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s", 692 name); 693 return GL_FALSE; 694 } else if (offset == o(dummy_true) && state == GL_FALSE) { 695 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: " 696 "%s", name); 697 return GL_FALSE; 698 } else { 699 GLboolean *base = (GLboolean *) &ctx->Extensions; 700 base[offset] = state; 701 return GL_TRUE; 702 } 703} 704 705 706/** 707 * Enable the named extension. 708 * Typically called by drivers. 709 */ 710void 711_mesa_enable_extension( struct gl_context *ctx, const char *name ) 712{ 713 if (!set_extension(ctx, name, GL_TRUE)) 714 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name); 715} 716 717 718/** 719 * Disable the named extension. 720 * XXX is this really needed??? 721 */ 722void 723_mesa_disable_extension( struct gl_context *ctx, const char *name ) 724{ 725 if (!set_extension(ctx, name, GL_FALSE)) 726 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name); 727} 728 729 730/** 731 * Test if the named extension is enabled in this context. 732 */ 733GLboolean 734_mesa_extension_is_enabled( struct gl_context *ctx, const char *name ) 735{ 736 size_t offset; 737 GLboolean *base; 738 739 if (name == 0) 740 return GL_FALSE; 741 742 offset = name_to_offset(name); 743 if (offset == 0) 744 return GL_FALSE; 745 base = (GLboolean *) &ctx->Extensions; 746 return base[offset]; 747} 748 749 750/** 751 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable. 752 * 753 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to 754 * enable or disable. The list is processed thus: 755 * - Enable recognized extension names that are prefixed with '+'. 756 * - Disable recognized extension names that are prefixed with '-'. 757 * - Enable recognized extension names that are not prefixed. 758 * - Collect unrecognized extension names in a new string. 759 * 760 * \return Space-separated list of unrecognized extension names (which must 761 * be freed). Does not return \c NULL. 762 */ 763static char * 764get_extension_override( struct gl_context *ctx ) 765{ 766 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE"); 767 char *env; 768 char *ext; 769 char *extra_exts; 770 int len; 771 772 if (env_const == NULL) { 773 /* Return the empty string rather than NULL. This simplifies the logic 774 * of client functions. */ 775 return calloc(1, sizeof(char)); 776 } 777 778 /* extra_exts: List of unrecognized extensions. */ 779 extra_exts = calloc(strlen(env_const), sizeof(char)); 780 781 /* Copy env_const because strtok() is destructive. */ 782 env = strdup(env_const); 783 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) { 784 int enable; 785 int recognized; 786 switch (ext[0]) { 787 case '+': 788 enable = 1; 789 ++ext; 790 break; 791 case '-': 792 enable = 0; 793 ++ext; 794 break; 795 default: 796 enable = 1; 797 break; 798 } 799 recognized = set_extension(ctx, ext, enable); 800 if (!recognized) { 801 strcat(extra_exts, ext); 802 strcat(extra_exts, " "); 803 } 804 } 805 806 /* Remove trailing space. */ 807 len = strlen(extra_exts); 808 if (extra_exts[len - 1] == ' ') 809 extra_exts[len - 1] = '\0'; 810 811 return extra_exts; 812} 813 814 815/** 816 * \brief Initialize extension tables and enable default extensions. 817 * 818 * This should be called during context initialization. 819 * Note: Sets gl_extensions.dummy_true to true. 820 */ 821void 822_mesa_init_extensions( struct gl_context *ctx ) 823{ 824 GLboolean *base = (GLboolean *) &ctx->Extensions; 825 GLboolean *sentinel = base + o(extension_sentinel); 826 GLboolean *i; 827 const size_t *j; 828 829 /* First, turn all extensions off. */ 830 for (i = base; i != sentinel; ++i) 831 *i = GL_FALSE; 832 833 /* Then, selectively turn default extensions on. */ 834 ctx->Extensions.dummy_true = GL_TRUE; 835 for (j = default_extensions; *j != 0; ++j) 836 base[*j] = GL_TRUE; 837} 838 839 840typedef unsigned short extension_index; 841 842 843/** 844 * Compare two entries of the extensions table. Sorts first by year, 845 * then by name. 846 * 847 * Arguments are indices into extension_table. 848 */ 849static int 850extension_compare(const void *p1, const void *p2) 851{ 852 extension_index i1 = * (const extension_index *) p1; 853 extension_index i2 = * (const extension_index *) p2; 854 const struct extension *e1 = &extension_table[i1]; 855 const struct extension *e2 = &extension_table[i2]; 856 int res; 857 858 res = (int)e1->year - (int)e2->year; 859 860 if (res == 0) { 861 res = strcmp(e1->name, e2->name); 862 } 863 864 return res; 865} 866 867 868/** 869 * Construct the GL_EXTENSIONS string. Called the first time that 870 * glGetString(GL_EXTENSIONS) is called. 871 */ 872GLubyte* 873_mesa_make_extension_string(struct gl_context *ctx) 874{ 875 /* The extension string. */ 876 char *exts = 0; 877 /* Length of extension string. */ 878 size_t length = 0; 879 /* Number of extensions */ 880 unsigned count; 881 /* Indices of the extensions sorted by year */ 882 extension_index *extension_indices; 883 /* String of extra extensions. */ 884 char *extra_extensions = get_extension_override(ctx); 885 GLboolean *base = (GLboolean *) &ctx->Extensions; 886 const struct extension *i; 887 unsigned j; 888 unsigned maxYear = ~0; 889 890 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */ 891 { 892 const char *env = getenv("MESA_EXTENSION_MAX_YEAR"); 893 if (env) { 894 maxYear = atoi(env); 895 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n", 896 maxYear); 897 } 898 } 899 900 /* Compute length of the extension string. */ 901 count = 0; 902 for (i = extension_table; i->name != 0; ++i) { 903 if (base[i->offset] && 904 i->year <= maxYear && 905 (i->api_set & (1 << ctx->API))) { 906 length += strlen(i->name) + 1; /* +1 for space */ 907 ++count; 908 } 909 } 910 if (extra_extensions != NULL) 911 length += 1 + strlen(extra_extensions); /* +1 for space */ 912 913 exts = (char *) calloc(length + 1, sizeof(char)); 914 if (exts == NULL) { 915 free(extra_extensions); 916 return NULL; 917 } 918 919 extension_indices = malloc(count * sizeof(extension_index)); 920 if (extension_indices == NULL) { 921 free(exts); 922 free(extra_extensions); 923 return NULL; 924 } 925 926 /* Sort extensions in chronological order because certain old applications (e.g., 927 * Quake3 demo) store the extension list in a static size buffer so chronologically 928 * order ensure that the extensions that such applications expect will fit into 929 * that buffer. 930 */ 931 j = 0; 932 for (i = extension_table; i->name != 0; ++i) { 933 if (base[i->offset] && 934 i->year <= maxYear && 935 (i->api_set & (1 << ctx->API))) { 936 extension_indices[j++] = i - extension_table; 937 } 938 } 939 assert(j == count); 940 qsort(extension_indices, count, sizeof *extension_indices, extension_compare); 941 942 /* Build the extension string.*/ 943 for (j = 0; j < count; ++j) { 944 i = &extension_table[extension_indices[j]]; 945 assert(base[i->offset] && (i->api_set & (1 << ctx->API))); 946 strcat(exts, i->name); 947 strcat(exts, " "); 948 } 949 free(extension_indices); 950 if (extra_extensions != 0) { 951 strcat(exts, extra_extensions); 952 free(extra_extensions); 953 } 954 955 return (GLubyte *) exts; 956} 957 958/** 959 * Return number of enabled extensions. 960 */ 961GLuint 962_mesa_get_extension_count(struct gl_context *ctx) 963{ 964 GLboolean *base; 965 const struct extension *i; 966 967 /* only count once */ 968 if (ctx->Extensions.Count != 0) 969 return ctx->Extensions.Count; 970 971 base = (GLboolean *) &ctx->Extensions; 972 for (i = extension_table; i->name != 0; ++i) { 973 if (base[i->offset]) { 974 ctx->Extensions.Count++; 975 } 976 } 977 return ctx->Extensions.Count; 978} 979 980/** 981 * Return name of i-th enabled extension 982 */ 983const GLubyte * 984_mesa_get_enabled_extension(struct gl_context *ctx, GLuint index) 985{ 986 const GLboolean *base; 987 size_t n; 988 const struct extension *i; 989 990 if (index < 0) 991 return NULL; 992 993 base = (GLboolean*) &ctx->Extensions; 994 n = 0; 995 for (i = extension_table; i->name != 0; ++i) { 996 if (n == index && base[i->offset]) { 997 return (GLubyte*) i->name; 998 } else if (base[i->offset]) { 999 ++n; 1000 } 1001 } 1002 1003 return NULL; 1004} 1005