extensions.c revision 8d06574d2b80ea645b27a0b1c2b68054a80dad3f
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 40#define ALIGN(value, alignment) (((value) + alignment - 1) & ~(alignment - 1)) 41 42enum { 43 DISABLE = 0, 44 GLL = 1 << API_OPENGL, /* GL Legacy / Compatibility */ 45 GLC = 1 << API_OPENGL_CORE, /* GL Core */ 46 GL = (1 << API_OPENGL) | (1 << API_OPENGL_CORE), 47 ES1 = 1 << API_OPENGLES, 48 ES2 = 1 << API_OPENGLES2, 49}; 50 51/** 52 * \brief An element of the \c extension_table. 53 */ 54struct extension { 55 /** Name of extension, such as "GL_ARB_depth_clamp". */ 56 const char *name; 57 58 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */ 59 size_t offset; 60 61 /** Set of API's in which the extension exists, as a bitset. */ 62 uint8_t api_set; 63 64 /** Year the extension was proposed or approved. Used to sort the 65 * extension string chronologically. */ 66 uint16_t year; 67}; 68 69 70/** 71 * Given a member \c x of struct gl_extensions, return offset of 72 * \c x in bytes. 73 */ 74#define o(x) offsetof(struct gl_extensions, x) 75 76 77/** 78 * \brief Table of supported OpenGL extensions for all API's. 79 */ 80static const struct extension extension_table[] = { 81 /* ARB Extensions */ 82 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 }, 83 { "GL_ARB_base_instance", o(ARB_base_instance), GL, 2011 }, 84 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 }, 85 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 }, 86 { "GL_ARB_copy_buffer", o(ARB_copy_buffer), GL, 2008 }, 87 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 }, 88 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 }, 89 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 }, 90 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 }, 91 { "GL_ARB_depth_texture", o(ARB_depth_texture), GLL, 2001 }, 92 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 }, 93 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 }, 94 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 }, 95 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 }, 96 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 }, 97 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 }, 98 { "GL_ARB_fragment_program", o(ARB_fragment_program), GLL, 2002 }, 99 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GLL, 2003 }, 100 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 }, 101 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 }, 102 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 }, 103 { "GL_ARB_half_float_pixel", o(ARB_half_float_pixel), GL, 2003 }, 104 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 }, 105 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 }, 106 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 }, 107 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 }, 108 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 }, 109 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 }, 110 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 }, 111 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 }, 112 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 }, 113 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 }, 114 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 }, 115 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 }, 116 { "GL_ARB_robustness", o(dummy_true), GL, 2010 }, 117 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 }, 118 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 }, 119 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 }, 120 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 }, 121 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 }, 122 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 }, 123 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GLL, 2003 }, 124 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 }, 125 { "GL_ARB_sync", o(ARB_sync), GL, 2003 }, 126 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 }, 127 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 }, 128 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 }, 129 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 }, 130 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 }, 131 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 }, 132 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 }, 133 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 }, 134 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 }, 135 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 }, 136 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 }, 137 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 }, 138 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 }, 139 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 }, 140 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 }, 141 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 }, 142 { "GL_ARB_texture_storage", o(ARB_texture_storage), GL, 2011 }, 143 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 }, 144 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 }, 145 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 }, 146 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 }, 147 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 }, 148 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GLL, 1999 }, 149 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 }, 150 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 }, 151 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 }, 152 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 }, 153 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 }, 154 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 }, 155 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 }, 156 { "GL_ARB_window_pos", o(ARB_window_pos), GLL, 2001 }, 157 /* EXT extensions */ 158 { "GL_EXT_abgr", o(dummy_true), GL, 1995 }, 159 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 }, 160 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 }, 161 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 }, 162 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 }, 163 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 }, 164 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 }, 165 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 }, 166 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GLL, 1996 }, 167 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 }, 168 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 }, 169 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 }, 170 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 }, 171 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GLL, 1997 }, 172 { "GL_EXT_fog_coord", o(EXT_fog_coord), GLL, 1999 }, 173 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 }, 174 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 }, 175 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 }, 176 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 }, 177 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 }, 178 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 }, 179 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 }, 180 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 }, 181 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 }, 182 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GLL, 1997 }, 183 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 }, 184 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 }, 185 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 }, 186 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 }, 187 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GLL, 1997 }, 188 { "GL_EXT_secondary_color", o(EXT_secondary_color), GLL, 1999 }, 189 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GLL, 2008 }, 190 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GLL, 1997 }, 191 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GLL, 2002 }, 192 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 }, 193 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 }, 194 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 }, 195 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 }, 196 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 }, 197 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 }, 198 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 }, 199 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 }, 200 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 }, 201 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 }, 202 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 }, 203 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 }, 204 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 }, 205 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 }, 206 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 }, 207 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 }, 208 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 }, 209 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 }, 210 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 }, 211 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 }, 212 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 }, 213 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 }, 214 { "GL_EXT_texture", o(dummy_true), GLL, 1996 }, 215 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 }, 216 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 }, 217 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 }, 218 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 }, 219 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 }, 220 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 }, 221 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 }, 222 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 }, 223 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 }, 224 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 }, 225 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 }, 226 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 }, 227 228 /* OES extensions */ 229 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 }, 230 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 }, 231 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 }, 232 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 }, 233 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 }, 234 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 }, 235 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 236 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 }, 237 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 }, 238#if FEATURE_OES_draw_texture 239 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 }, 240#endif 241#if FEATURE_OES_EGL_image 242 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */ 243 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 }, 244 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 }, 245#endif 246 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 }, 247 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 248 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 }, 249 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 }, 250 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 }, 251 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 }, 252 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 }, 253 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 }, 254 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 }, 255 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 }, 256 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 }, 257 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 258 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 }, 259 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 }, 260 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 }, 261 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 }, 262 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 }, 263 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 }, 264 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 }, 265 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 }, 266 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 }, 267 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 }, 268 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 }, 269 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 }, 270 271 /* Vendor extensions */ 272 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 }, 273 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 }, 274 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 }, 275 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 }, 276 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 }, 277 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 }, 278 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GLL, 2002 }, 279 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 }, 280 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 }, 281 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 }, 282 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 }, 283 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GLL, 2001 }, 284 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 }, 285 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 }, 286 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 }, 287 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 }, 288 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 }, 289 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 }, 290 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 }, 291 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 }, 292 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 }, 293 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 }, 294 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 }, 295 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 }, 296 { "GL_MESA_texture_array", o(MESA_texture_array), GLL, 2007 }, 297 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 }, 298 { "GL_MESA_window_pos", o(ARB_window_pos), GLL, 2000 }, 299 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 }, 300 { "GL_NV_blend_square", o(NV_blend_square), GLL, 1999 }, 301 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 }, 302 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 }, 303 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 }, 304 { "GL_NV_fbo_color_attachments", o(EXT_framebuffer_object), ES2, 2010 }, 305 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 }, 306 { "GL_NV_fragment_program", o(NV_fragment_program), GLL, 2001 }, 307 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 }, 308 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GLL, 1999 }, 309 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 }, 310 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 }, 311 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 }, 312 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 }, 313 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GLL, 1999 }, 314 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 }, 315 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 }, 316 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 }, 317 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GLL, 2001 }, 318 { "GL_NV_vertex_program", o(NV_vertex_program), GLL, 2000 }, 319 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 }, 320 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 }, 321 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 }, 322 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 }, 323 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GLL, 1997 }, 324 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 }, 325 326 { 0, 0, 0, 0 }, 327}; 328 329 330/** 331 * Given an extension name, lookup up the corresponding member of struct 332 * gl_extensions and return that member's offset (in bytes). If the name is 333 * not found in the \c extension_table, return 0. 334 * 335 * \param name Name of extension. 336 * \return Offset of member in struct gl_extensions. 337 */ 338static size_t 339name_to_offset(const char* name) 340{ 341 const struct extension *i; 342 343 if (name == 0) 344 return 0; 345 346 for (i = extension_table; i->name != 0; ++i) { 347 if (strcmp(name, i->name) == 0) 348 return i->offset; 349 } 350 351 return 0; 352} 353 354 355/** 356 * \brief Extensions enabled by default. 357 * 358 * These extensions are enabled by _mesa_init_extensions(). 359 * 360 * XXX: Should these defaults also apply to GLES? 361 */ 362static const size_t default_extensions[] = { 363 o(ARB_copy_buffer), 364 o(ARB_transpose_matrix), 365 o(ARB_window_pos), 366 367 o(EXT_compiled_vertex_array), 368 o(EXT_draw_range_elements), 369 o(EXT_packed_pixels), 370 o(EXT_rescale_normal), 371 o(EXT_separate_specular_color), 372 o(EXT_texture3D), 373 374 o(OES_standard_derivatives), 375 376 /* Vendor Extensions */ 377 o(APPLE_packed_pixels), 378 o(IBM_multimode_draw_arrays), 379 o(IBM_rasterpos_clip), 380 o(NV_light_max_exponent), 381 o(NV_texgen_reflection), 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_elements_base_vertex = GL_TRUE; 399 ctx->Extensions.ARB_draw_instanced = GL_TRUE; 400 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE; 401 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE; 402#if FEATURE_ARB_fragment_program 403 ctx->Extensions.ARB_fragment_program = GL_TRUE; 404 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE; 405#endif 406#if FEATURE_ARB_fragment_shader 407 ctx->Extensions.ARB_fragment_shader = GL_TRUE; 408#endif 409#if FEATURE_ARB_framebuffer_object 410 ctx->Extensions.ARB_framebuffer_object = GL_TRUE; 411#endif 412#if FEATURE_ARB_geometry_shader4 && 0 413 /* XXX re-enable when GLSL compiler again supports geometry shaders */ 414 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE; 415#endif 416 ctx->Extensions.ARB_half_float_pixel = GL_TRUE; 417 ctx->Extensions.ARB_half_float_vertex = GL_TRUE; 418 ctx->Extensions.ARB_map_buffer_range = GL_TRUE; 419#if FEATURE_queryobj 420 ctx->Extensions.ARB_occlusion_query = GL_TRUE; 421 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE; 422#endif 423 ctx->Extensions.ARB_point_sprite = GL_TRUE; 424#if FEATURE_ARB_shader_objects 425 ctx->Extensions.ARB_shader_objects = GL_TRUE; 426 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE; 427#endif 428#if FEATURE_ARB_shading_language_100 429 ctx->Extensions.ARB_shading_language_100 = GL_TRUE; 430#endif 431 ctx->Extensions.ARB_shadow = GL_TRUE; 432 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; 433 ctx->Extensions.ARB_texture_cube_map = GL_TRUE; 434 ctx->Extensions.ARB_texture_env_combine = GL_TRUE; 435 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE; 436 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE; 437 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/ 438 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; 439 ctx->Extensions.ARB_texture_rg = GL_TRUE; 440 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE; 441 ctx->Extensions.ARB_texture_storage = GL_TRUE; 442#if FEATURE_ARB_vertex_program 443 ctx->Extensions.ARB_vertex_program = GL_TRUE; 444#endif 445#if FEATURE_ARB_vertex_shader 446 ctx->Extensions.ARB_vertex_shader = GL_TRUE; 447#endif 448#if FEATURE_ARB_sync 449 ctx->Extensions.ARB_sync = GL_TRUE; 450#endif 451#if FEATURE_APPLE_object_purgeable 452 ctx->Extensions.APPLE_object_purgeable = GL_TRUE; 453#endif 454 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE; 455#if FEATURE_ATI_fragment_shader 456 ctx->Extensions.ATI_fragment_shader = GL_TRUE; 457#endif 458 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE; 459 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE; 460 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE; 461 ctx->Extensions.ATI_separate_stencil = GL_TRUE; 462 ctx->Extensions.EXT_blend_color = GL_TRUE; 463 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE; 464 ctx->Extensions.EXT_blend_func_separate = GL_TRUE; 465 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 466 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE; 467 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE; 468 ctx->Extensions.EXT_fog_coord = GL_TRUE; 469#if FEATURE_EXT_framebuffer_object 470 ctx->Extensions.EXT_framebuffer_object = GL_TRUE; 471#endif 472#if FEATURE_EXT_framebuffer_blit 473 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE; 474#endif 475#if FEATURE_ARB_framebuffer_object 476 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE; 477#endif 478 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE; 479#if FEATURE_EXT_pixel_buffer_object 480 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 481#endif 482 ctx->Extensions.EXT_point_parameters = GL_TRUE; 483 ctx->Extensions.EXT_provoking_vertex = GL_TRUE; 484 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 485 ctx->Extensions.EXT_secondary_color = GL_TRUE; 486 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 487 ctx->Extensions.EXT_texture_array = GL_TRUE; 488 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE; 489 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE; 490 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE; 491 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE; 492 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE; 493#if FEATURE_EXT_texture_sRGB 494 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 495 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE; 496#endif 497 ctx->Extensions.EXT_texture_swizzle = GL_TRUE; 498#if FEATURE_EXT_transform_feedback 499 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/ 500#endif 501 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE; 502 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/ 503 ctx->Extensions.MESA_pack_invert = GL_TRUE; 504 ctx->Extensions.MESA_resize_buffers = GL_TRUE; 505 ctx->Extensions.MESA_texture_array = GL_TRUE; 506 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE; 507 ctx->Extensions.NV_blend_square = GL_TRUE; 508 ctx->Extensions.NV_conditional_render = GL_TRUE; 509 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/ 510 ctx->Extensions.NV_point_sprite = GL_TRUE; 511 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE; 512 ctx->Extensions.NV_texture_rectangle = GL_TRUE; 513 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/ 514#if FEATURE_NV_vertex_program 515 ctx->Extensions.NV_vertex_program = GL_TRUE; 516 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE; 517#endif 518#if FEATURE_NV_fragment_program 519 ctx->Extensions.NV_fragment_program = GL_TRUE; 520#endif 521#if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program 522 ctx->Extensions.NV_fragment_program_option = GL_TRUE; 523#endif 524#if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program 525 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE; 526#endif 527#if FEATURE_texture_fxt1 528 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1"); 529#endif 530#if FEATURE_texture_s3tc 531 if (ctx->Mesa_DXTn) { 532 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc"); 533 _mesa_enable_extension(ctx, "GL_S3_s3tc"); 534 } 535#endif 536} 537 538 539/** 540 * Enable all OpenGL 1.3 features and extensions. 541 * A convenience function to be called by drivers. 542 */ 543void 544_mesa_enable_1_3_extensions(struct gl_context *ctx) 545{ 546 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; 547 ctx->Extensions.ARB_texture_cube_map = GL_TRUE; 548 ctx->Extensions.ARB_texture_env_combine = GL_TRUE; 549 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE; 550 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/ 551} 552 553 554 555/** 556 * Enable all OpenGL 1.4 features and extensions. 557 * A convenience function to be called by drivers. 558 */ 559void 560_mesa_enable_1_4_extensions(struct gl_context *ctx) 561{ 562 ctx->Extensions.ARB_depth_texture = GL_TRUE; 563 ctx->Extensions.ARB_shadow = GL_TRUE; 564 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE; 565 ctx->Extensions.ARB_window_pos = GL_TRUE; 566 ctx->Extensions.EXT_blend_color = GL_TRUE; 567 ctx->Extensions.EXT_blend_func_separate = GL_TRUE; 568 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 569 ctx->Extensions.EXT_fog_coord = GL_TRUE; 570 ctx->Extensions.EXT_point_parameters = GL_TRUE; 571 ctx->Extensions.EXT_secondary_color = GL_TRUE; 572} 573 574 575/** 576 * Enable all OpenGL 1.5 features and extensions. 577 * A convenience function to be called by drivers. 578 */ 579void 580_mesa_enable_1_5_extensions(struct gl_context *ctx) 581{ 582 ctx->Extensions.ARB_occlusion_query = GL_TRUE; 583 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 584} 585 586 587/** 588 * Enable all OpenGL 2.0 features and extensions. 589 * A convenience function to be called by drivers. 590 */ 591void 592_mesa_enable_2_0_extensions(struct gl_context *ctx) 593{ 594#if FEATURE_ARB_fragment_shader 595 ctx->Extensions.ARB_fragment_shader = GL_TRUE; 596#endif 597 ctx->Extensions.ARB_point_sprite = GL_TRUE; 598 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE; 599 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; 600#if FEATURE_ARB_shader_objects 601 ctx->Extensions.ARB_shader_objects = GL_TRUE; 602#endif 603#if FEATURE_ARB_shading_language_100 604 ctx->Extensions.ARB_shading_language_100 = GL_TRUE; 605#endif 606 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 607#if FEATURE_ARB_vertex_shader 608 ctx->Extensions.ARB_vertex_shader = GL_TRUE; 609#endif 610} 611 612 613/** 614 * Enable all OpenGL 2.1 features and extensions. 615 * A convenience function to be called by drivers. 616 */ 617void 618_mesa_enable_2_1_extensions(struct gl_context *ctx) 619{ 620#if FEATURE_EXT_pixel_buffer_object 621 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 622#endif 623#if FEATURE_EXT_texture_sRGB 624 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 625#endif 626} 627 628 629/** 630 * Either enable or disable the named extension. 631 * \return GL_TRUE for success, GL_FALSE if invalid extension name 632 */ 633static GLboolean 634set_extension( struct gl_context *ctx, const char *name, GLboolean state ) 635{ 636 size_t offset; 637 638 if (ctx->Extensions.String) { 639 /* The string was already queried - can't change it now! */ 640 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name); 641 return GL_FALSE; 642 } 643 644 offset = name_to_offset(name); 645 if (offset == 0) { 646 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s", 647 name); 648 return GL_FALSE; 649 } else if (offset == o(dummy_true) && state == GL_FALSE) { 650 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: " 651 "%s", name); 652 return GL_FALSE; 653 } else { 654 GLboolean *base = (GLboolean *) &ctx->Extensions; 655 base[offset] = state; 656 return GL_TRUE; 657 } 658} 659 660 661/** 662 * Enable the named extension. 663 * Typically called by drivers. 664 */ 665void 666_mesa_enable_extension( struct gl_context *ctx, const char *name ) 667{ 668 if (!set_extension(ctx, name, GL_TRUE)) 669 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name); 670} 671 672 673/** 674 * Disable the named extension. 675 * XXX is this really needed??? 676 */ 677void 678_mesa_disable_extension( struct gl_context *ctx, const char *name ) 679{ 680 if (!set_extension(ctx, name, GL_FALSE)) 681 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name); 682} 683 684 685/** 686 * Test if the named extension is enabled in this context. 687 */ 688GLboolean 689_mesa_extension_is_enabled( struct gl_context *ctx, const char *name ) 690{ 691 size_t offset; 692 GLboolean *base; 693 694 if (name == 0) 695 return GL_FALSE; 696 697 offset = name_to_offset(name); 698 if (offset == 0) 699 return GL_FALSE; 700 base = (GLboolean *) &ctx->Extensions; 701 return base[offset]; 702} 703 704 705/** 706 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable. 707 * 708 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to 709 * enable or disable. The list is processed thus: 710 * - Enable recognized extension names that are prefixed with '+'. 711 * - Disable recognized extension names that are prefixed with '-'. 712 * - Enable recognized extension names that are not prefixed. 713 * - Collect unrecognized extension names in a new string. 714 * 715 * \return Space-separated list of unrecognized extension names (which must 716 * be freed). Does not return \c NULL. 717 */ 718static char * 719get_extension_override( struct gl_context *ctx ) 720{ 721 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE"); 722 char *env; 723 char *ext; 724 char *extra_exts; 725 int len; 726 727 if (env_const == NULL) { 728 /* Return the empty string rather than NULL. This simplifies the logic 729 * of client functions. */ 730 return calloc(4, sizeof(char)); 731 } 732 733 /* extra_exts: List of unrecognized extensions. */ 734 extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char)); 735 736 /* Copy env_const because strtok() is destructive. */ 737 env = strdup(env_const); 738 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) { 739 int enable; 740 int recognized; 741 switch (ext[0]) { 742 case '+': 743 enable = 1; 744 ++ext; 745 break; 746 case '-': 747 enable = 0; 748 ++ext; 749 break; 750 default: 751 enable = 1; 752 break; 753 } 754 recognized = set_extension(ctx, ext, enable); 755 if (!recognized) { 756 strcat(extra_exts, ext); 757 strcat(extra_exts, " "); 758 } 759 } 760 761 free(env); 762 763 /* Remove trailing space. */ 764 len = strlen(extra_exts); 765 if (len > 0 && extra_exts[len - 1] == ' ') 766 extra_exts[len - 1] = '\0'; 767 768 return extra_exts; 769} 770 771 772/** 773 * \brief Initialize extension tables and enable default extensions. 774 * 775 * This should be called during context initialization. 776 * Note: Sets gl_extensions.dummy_true to true. 777 */ 778void 779_mesa_init_extensions( struct gl_context *ctx ) 780{ 781 GLboolean *base = (GLboolean *) &ctx->Extensions; 782 GLboolean *sentinel = base + o(extension_sentinel); 783 GLboolean *i; 784 const size_t *j; 785 786 /* First, turn all extensions off. */ 787 for (i = base; i != sentinel; ++i) 788 *i = GL_FALSE; 789 790 /* Then, selectively turn default extensions on. */ 791 ctx->Extensions.dummy_true = GL_TRUE; 792 for (j = default_extensions; *j != 0; ++j) 793 base[*j] = GL_TRUE; 794} 795 796 797typedef unsigned short extension_index; 798 799 800/** 801 * Compare two entries of the extensions table. Sorts first by year, 802 * then by name. 803 * 804 * Arguments are indices into extension_table. 805 */ 806static int 807extension_compare(const void *p1, const void *p2) 808{ 809 extension_index i1 = * (const extension_index *) p1; 810 extension_index i2 = * (const extension_index *) p2; 811 const struct extension *e1 = &extension_table[i1]; 812 const struct extension *e2 = &extension_table[i2]; 813 int res; 814 815 res = (int)e1->year - (int)e2->year; 816 817 if (res == 0) { 818 res = strcmp(e1->name, e2->name); 819 } 820 821 return res; 822} 823 824 825/** 826 * Construct the GL_EXTENSIONS string. Called the first time that 827 * glGetString(GL_EXTENSIONS) is called. 828 */ 829GLubyte* 830_mesa_make_extension_string(struct gl_context *ctx) 831{ 832 /* The extension string. */ 833 char *exts = 0; 834 /* Length of extension string. */ 835 size_t length = 0; 836 /* Number of extensions */ 837 unsigned count; 838 /* Indices of the extensions sorted by year */ 839 extension_index *extension_indices; 840 /* String of extra extensions. */ 841 char *extra_extensions = get_extension_override(ctx); 842 GLboolean *base = (GLboolean *) &ctx->Extensions; 843 const struct extension *i; 844 unsigned j; 845 unsigned maxYear = ~0; 846 847 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */ 848 { 849 const char *env = getenv("MESA_EXTENSION_MAX_YEAR"); 850 if (env) { 851 maxYear = atoi(env); 852 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n", 853 maxYear); 854 } 855 } 856 857 /* Compute length of the extension string. */ 858 count = 0; 859 for (i = extension_table; i->name != 0; ++i) { 860 if (base[i->offset] && 861 i->year <= maxYear && 862 (i->api_set & (1 << ctx->API))) { 863 length += strlen(i->name) + 1; /* +1 for space */ 864 ++count; 865 } 866 } 867 if (extra_extensions != NULL) 868 length += 1 + strlen(extra_extensions); /* +1 for space */ 869 870 exts = (char *) calloc(ALIGN(length + 1, 4), sizeof(char)); 871 if (exts == NULL) { 872 free(extra_extensions); 873 return NULL; 874 } 875 876 extension_indices = malloc(count * sizeof(extension_index)); 877 if (extension_indices == NULL) { 878 free(exts); 879 free(extra_extensions); 880 return NULL; 881 } 882 883 /* Sort extensions in chronological order because certain old applications (e.g., 884 * Quake3 demo) store the extension list in a static size buffer so chronologically 885 * order ensure that the extensions that such applications expect will fit into 886 * that buffer. 887 */ 888 j = 0; 889 for (i = extension_table; i->name != 0; ++i) { 890 if (base[i->offset] && 891 i->year <= maxYear && 892 (i->api_set & (1 << ctx->API))) { 893 extension_indices[j++] = i - extension_table; 894 } 895 } 896 assert(j == count); 897 qsort(extension_indices, count, sizeof *extension_indices, extension_compare); 898 899 /* Build the extension string.*/ 900 for (j = 0; j < count; ++j) { 901 i = &extension_table[extension_indices[j]]; 902 assert(base[i->offset] && (i->api_set & (1 << ctx->API))); 903 strcat(exts, i->name); 904 strcat(exts, " "); 905 } 906 free(extension_indices); 907 if (extra_extensions != 0) { 908 strcat(exts, extra_extensions); 909 free(extra_extensions); 910 } 911 912 return (GLubyte *) exts; 913} 914 915/** 916 * Return number of enabled extensions. 917 */ 918GLuint 919_mesa_get_extension_count(struct gl_context *ctx) 920{ 921 GLboolean *base; 922 const struct extension *i; 923 924 /* only count once */ 925 if (ctx->Extensions.Count != 0) 926 return ctx->Extensions.Count; 927 928 base = (GLboolean *) &ctx->Extensions; 929 for (i = extension_table; i->name != 0; ++i) { 930 if (base[i->offset] && (i->api_set & (1 << ctx->API))) { 931 ctx->Extensions.Count++; 932 } 933 } 934 return ctx->Extensions.Count; 935} 936 937/** 938 * Return name of i-th enabled extension 939 */ 940const GLubyte * 941_mesa_get_enabled_extension(struct gl_context *ctx, GLuint index) 942{ 943 const GLboolean *base; 944 size_t n; 945 const struct extension *i; 946 947 base = (GLboolean*) &ctx->Extensions; 948 n = 0; 949 for (i = extension_table; i->name != 0; ++i) { 950 if (base[i->offset] && (i->api_set & (1 << ctx->API))) { 951 if (n == index) 952 return (const GLubyte*) i->name; 953 else 954 ++n; 955 } 956 } 957 958 return NULL; 959} 960