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 42 enum { 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 */ 54 struct 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 */ 80 static 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), GLL, 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), GLL, 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 */ 338 static size_t 339 name_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 */ 362 static 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 */ 392 void 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 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE; 476 #if FEATURE_EXT_pixel_buffer_object 477 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 478 #endif 479 ctx->Extensions.EXT_point_parameters = GL_TRUE; 480 ctx->Extensions.EXT_provoking_vertex = GL_TRUE; 481 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 482 ctx->Extensions.EXT_secondary_color = GL_TRUE; 483 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 484 ctx->Extensions.EXT_texture_array = GL_TRUE; 485 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE; 486 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE; 487 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE; 488 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE; 489 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE; 490 #if FEATURE_EXT_texture_sRGB 491 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 492 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE; 493 #endif 494 ctx->Extensions.EXT_texture_swizzle = GL_TRUE; 495 #if FEATURE_EXT_transform_feedback 496 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/ 497 #endif 498 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE; 499 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/ 500 ctx->Extensions.MESA_pack_invert = GL_TRUE; 501 ctx->Extensions.MESA_resize_buffers = GL_TRUE; 502 ctx->Extensions.MESA_texture_array = GL_TRUE; 503 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE; 504 ctx->Extensions.NV_blend_square = GL_TRUE; 505 ctx->Extensions.NV_conditional_render = GL_TRUE; 506 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/ 507 ctx->Extensions.NV_point_sprite = GL_TRUE; 508 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE; 509 ctx->Extensions.NV_texture_rectangle = GL_TRUE; 510 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/ 511 #if FEATURE_NV_vertex_program 512 ctx->Extensions.NV_vertex_program = GL_TRUE; 513 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE; 514 #endif 515 #if FEATURE_NV_fragment_program 516 ctx->Extensions.NV_fragment_program = GL_TRUE; 517 #endif 518 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program 519 ctx->Extensions.NV_fragment_program_option = GL_TRUE; 520 #endif 521 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program 522 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE; 523 #endif 524 #if FEATURE_texture_fxt1 525 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1"); 526 #endif 527 #if FEATURE_texture_s3tc 528 if (ctx->Mesa_DXTn) { 529 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc"); 530 _mesa_enable_extension(ctx, "GL_S3_s3tc"); 531 } 532 #endif 533 } 534 535 536 /** 537 * Enable all OpenGL 1.3 features and extensions. 538 * A convenience function to be called by drivers. 539 */ 540 void 541 _mesa_enable_1_3_extensions(struct gl_context *ctx) 542 { 543 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; 544 ctx->Extensions.ARB_texture_cube_map = GL_TRUE; 545 ctx->Extensions.ARB_texture_env_combine = GL_TRUE; 546 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE; 547 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/ 548 } 549 550 551 552 /** 553 * Enable all OpenGL 1.4 features and extensions. 554 * A convenience function to be called by drivers. 555 */ 556 void 557 _mesa_enable_1_4_extensions(struct gl_context *ctx) 558 { 559 ctx->Extensions.ARB_depth_texture = GL_TRUE; 560 ctx->Extensions.ARB_shadow = GL_TRUE; 561 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE; 562 ctx->Extensions.ARB_window_pos = GL_TRUE; 563 ctx->Extensions.EXT_blend_color = GL_TRUE; 564 ctx->Extensions.EXT_blend_func_separate = GL_TRUE; 565 ctx->Extensions.EXT_blend_minmax = GL_TRUE; 566 ctx->Extensions.EXT_fog_coord = GL_TRUE; 567 ctx->Extensions.EXT_point_parameters = GL_TRUE; 568 ctx->Extensions.EXT_secondary_color = GL_TRUE; 569 } 570 571 572 /** 573 * Enable all OpenGL 1.5 features and extensions. 574 * A convenience function to be called by drivers. 575 */ 576 void 577 _mesa_enable_1_5_extensions(struct gl_context *ctx) 578 { 579 ctx->Extensions.ARB_occlusion_query = GL_TRUE; 580 ctx->Extensions.EXT_shadow_funcs = GL_TRUE; 581 } 582 583 584 /** 585 * Enable all OpenGL 2.0 features and extensions. 586 * A convenience function to be called by drivers. 587 */ 588 void 589 _mesa_enable_2_0_extensions(struct gl_context *ctx) 590 { 591 #if FEATURE_ARB_fragment_shader 592 ctx->Extensions.ARB_fragment_shader = GL_TRUE; 593 #endif 594 ctx->Extensions.ARB_point_sprite = GL_TRUE; 595 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE; 596 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE; 597 #if FEATURE_ARB_shader_objects 598 ctx->Extensions.ARB_shader_objects = GL_TRUE; 599 #endif 600 #if FEATURE_ARB_shading_language_100 601 ctx->Extensions.ARB_shading_language_100 = GL_TRUE; 602 #endif 603 ctx->Extensions.EXT_stencil_two_side = GL_TRUE; 604 #if FEATURE_ARB_vertex_shader 605 ctx->Extensions.ARB_vertex_shader = GL_TRUE; 606 #endif 607 } 608 609 610 /** 611 * Enable all OpenGL 2.1 features and extensions. 612 * A convenience function to be called by drivers. 613 */ 614 void 615 _mesa_enable_2_1_extensions(struct gl_context *ctx) 616 { 617 #if FEATURE_EXT_pixel_buffer_object 618 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE; 619 #endif 620 #if FEATURE_EXT_texture_sRGB 621 ctx->Extensions.EXT_texture_sRGB = GL_TRUE; 622 #endif 623 } 624 625 626 /** 627 * Either enable or disable the named extension. 628 * \return GL_TRUE for success, GL_FALSE if invalid extension name 629 */ 630 static GLboolean 631 set_extension( struct gl_context *ctx, const char *name, GLboolean state ) 632 { 633 size_t offset; 634 635 if (ctx->Extensions.String) { 636 /* The string was already queried - can't change it now! */ 637 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name); 638 return GL_FALSE; 639 } 640 641 offset = name_to_offset(name); 642 if (offset == 0) { 643 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s", 644 name); 645 return GL_FALSE; 646 } else if (offset == o(dummy_true) && state == GL_FALSE) { 647 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: " 648 "%s", name); 649 return GL_FALSE; 650 } else { 651 GLboolean *base = (GLboolean *) &ctx->Extensions; 652 base[offset] = state; 653 return GL_TRUE; 654 } 655 } 656 657 658 /** 659 * Enable the named extension. 660 * Typically called by drivers. 661 */ 662 void 663 _mesa_enable_extension( struct gl_context *ctx, const char *name ) 664 { 665 if (!set_extension(ctx, name, GL_TRUE)) 666 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name); 667 } 668 669 670 /** 671 * Disable the named extension. 672 * XXX is this really needed??? 673 */ 674 void 675 _mesa_disable_extension( struct gl_context *ctx, const char *name ) 676 { 677 if (!set_extension(ctx, name, GL_FALSE)) 678 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name); 679 } 680 681 682 /** 683 * Test if the named extension is enabled in this context. 684 */ 685 GLboolean 686 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name ) 687 { 688 size_t offset; 689 GLboolean *base; 690 691 if (name == 0) 692 return GL_FALSE; 693 694 offset = name_to_offset(name); 695 if (offset == 0) 696 return GL_FALSE; 697 base = (GLboolean *) &ctx->Extensions; 698 return base[offset]; 699 } 700 701 702 /** 703 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable. 704 * 705 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to 706 * enable or disable. The list is processed thus: 707 * - Enable recognized extension names that are prefixed with '+'. 708 * - Disable recognized extension names that are prefixed with '-'. 709 * - Enable recognized extension names that are not prefixed. 710 * - Collect unrecognized extension names in a new string. 711 * 712 * \return Space-separated list of unrecognized extension names (which must 713 * be freed). Does not return \c NULL. 714 */ 715 static char * 716 get_extension_override( struct gl_context *ctx ) 717 { 718 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE"); 719 char *env; 720 char *ext; 721 char *extra_exts; 722 int len; 723 724 if (env_const == NULL) { 725 /* Return the empty string rather than NULL. This simplifies the logic 726 * of client functions. */ 727 return calloc(4, sizeof(char)); 728 } 729 730 /* extra_exts: List of unrecognized extensions. */ 731 extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char)); 732 733 /* Copy env_const because strtok() is destructive. */ 734 env = strdup(env_const); 735 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) { 736 int enable; 737 int recognized; 738 switch (ext[0]) { 739 case '+': 740 enable = 1; 741 ++ext; 742 break; 743 case '-': 744 enable = 0; 745 ++ext; 746 break; 747 default: 748 enable = 1; 749 break; 750 } 751 recognized = set_extension(ctx, ext, enable); 752 if (!recognized) { 753 strcat(extra_exts, ext); 754 strcat(extra_exts, " "); 755 } 756 } 757 758 free(env); 759 760 /* Remove trailing space. */ 761 len = strlen(extra_exts); 762 if (len > 0 && extra_exts[len - 1] == ' ') 763 extra_exts[len - 1] = '\0'; 764 765 return extra_exts; 766 } 767 768 769 /** 770 * \brief Initialize extension tables and enable default extensions. 771 * 772 * This should be called during context initialization. 773 * Note: Sets gl_extensions.dummy_true to true. 774 */ 775 void 776 _mesa_init_extensions( struct gl_context *ctx ) 777 { 778 GLboolean *base = (GLboolean *) &ctx->Extensions; 779 GLboolean *sentinel = base + o(extension_sentinel); 780 GLboolean *i; 781 const size_t *j; 782 783 /* First, turn all extensions off. */ 784 for (i = base; i != sentinel; ++i) 785 *i = GL_FALSE; 786 787 /* Then, selectively turn default extensions on. */ 788 ctx->Extensions.dummy_true = GL_TRUE; 789 for (j = default_extensions; *j != 0; ++j) 790 base[*j] = GL_TRUE; 791 } 792 793 794 typedef unsigned short extension_index; 795 796 797 /** 798 * Compare two entries of the extensions table. Sorts first by year, 799 * then by name. 800 * 801 * Arguments are indices into extension_table. 802 */ 803 static int 804 extension_compare(const void *p1, const void *p2) 805 { 806 extension_index i1 = * (const extension_index *) p1; 807 extension_index i2 = * (const extension_index *) p2; 808 const struct extension *e1 = &extension_table[i1]; 809 const struct extension *e2 = &extension_table[i2]; 810 int res; 811 812 res = (int)e1->year - (int)e2->year; 813 814 if (res == 0) { 815 res = strcmp(e1->name, e2->name); 816 } 817 818 return res; 819 } 820 821 822 /** 823 * Construct the GL_EXTENSIONS string. Called the first time that 824 * glGetString(GL_EXTENSIONS) is called. 825 */ 826 GLubyte* 827 _mesa_make_extension_string(struct gl_context *ctx) 828 { 829 /* The extension string. */ 830 char *exts = 0; 831 /* Length of extension string. */ 832 size_t length = 0; 833 /* Number of extensions */ 834 unsigned count; 835 /* Indices of the extensions sorted by year */ 836 extension_index *extension_indices; 837 /* String of extra extensions. */ 838 char *extra_extensions = get_extension_override(ctx); 839 GLboolean *base = (GLboolean *) &ctx->Extensions; 840 const struct extension *i; 841 unsigned j; 842 unsigned maxYear = ~0; 843 844 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */ 845 { 846 const char *env = getenv("MESA_EXTENSION_MAX_YEAR"); 847 if (env) { 848 maxYear = atoi(env); 849 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n", 850 maxYear); 851 } 852 } 853 854 /* Compute length of the extension string. */ 855 count = 0; 856 for (i = extension_table; i->name != 0; ++i) { 857 if (base[i->offset] && 858 i->year <= maxYear && 859 (i->api_set & (1 << ctx->API))) { 860 length += strlen(i->name) + 1; /* +1 for space */ 861 ++count; 862 } 863 } 864 if (extra_extensions != NULL) 865 length += 1 + strlen(extra_extensions); /* +1 for space */ 866 867 exts = (char *) calloc(ALIGN(length + 1, 4), sizeof(char)); 868 if (exts == NULL) { 869 free(extra_extensions); 870 return NULL; 871 } 872 873 extension_indices = malloc(count * sizeof(extension_index)); 874 if (extension_indices == NULL) { 875 free(exts); 876 free(extra_extensions); 877 return NULL; 878 } 879 880 /* Sort extensions in chronological order because certain old applications (e.g., 881 * Quake3 demo) store the extension list in a static size buffer so chronologically 882 * order ensure that the extensions that such applications expect will fit into 883 * that buffer. 884 */ 885 j = 0; 886 for (i = extension_table; i->name != 0; ++i) { 887 if (base[i->offset] && 888 i->year <= maxYear && 889 (i->api_set & (1 << ctx->API))) { 890 extension_indices[j++] = i - extension_table; 891 } 892 } 893 assert(j == count); 894 qsort(extension_indices, count, sizeof *extension_indices, extension_compare); 895 896 /* Build the extension string.*/ 897 for (j = 0; j < count; ++j) { 898 i = &extension_table[extension_indices[j]]; 899 assert(base[i->offset] && (i->api_set & (1 << ctx->API))); 900 strcat(exts, i->name); 901 strcat(exts, " "); 902 } 903 free(extension_indices); 904 if (extra_extensions != 0) { 905 strcat(exts, extra_extensions); 906 free(extra_extensions); 907 } 908 909 return (GLubyte *) exts; 910 } 911 912 /** 913 * Return number of enabled extensions. 914 */ 915 GLuint 916 _mesa_get_extension_count(struct gl_context *ctx) 917 { 918 GLboolean *base; 919 const struct extension *i; 920 921 /* only count once */ 922 if (ctx->Extensions.Count != 0) 923 return ctx->Extensions.Count; 924 925 base = (GLboolean *) &ctx->Extensions; 926 for (i = extension_table; i->name != 0; ++i) { 927 if (base[i->offset] && (i->api_set & (1 << ctx->API))) { 928 ctx->Extensions.Count++; 929 } 930 } 931 return ctx->Extensions.Count; 932 } 933 934 /** 935 * Return name of i-th enabled extension 936 */ 937 const GLubyte * 938 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index) 939 { 940 const GLboolean *base; 941 size_t n; 942 const struct extension *i; 943 944 base = (GLboolean*) &ctx->Extensions; 945 n = 0; 946 for (i = extension_table; i->name != 0; ++i) { 947 if (base[i->offset] && (i->api_set & (1 << ctx->API))) { 948 if (n == index) 949 return (const GLubyte*) i->name; 950 else 951 ++n; 952 } 953 } 954 955 return NULL; 956 } 957
