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mesa/main: Check allocations success in _mesa_one_time_init_extension_overrides()
[mesa.git] / src / mesa / main / extensions.c
1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * 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 "macros.h"
38 #include "mtypes.h"
39
40 struct gl_extensions _mesa_extension_override_enables;
41 struct gl_extensions _mesa_extension_override_disables;
42 static char *extra_extensions = NULL;
43 static char *cant_disable_extensions = NULL;
44
45 enum {
46 DISABLE = 0,
47 GLL = 1 << API_OPENGL_COMPAT, /* GL Legacy / Compatibility */
48 GLC = 1 << API_OPENGL_CORE, /* GL Core */
49 GL = (1 << API_OPENGL_COMPAT) | (1 << API_OPENGL_CORE),
50 ES1 = 1 << API_OPENGLES,
51 ES2 = 1 << API_OPENGLES2,
52 ES3 = 1 << (API_OPENGL_LAST + 1),
53 };
54
55 /**
56 * \brief An element of the \c extension_table.
57 */
58 struct extension {
59 /** Name of extension, such as "GL_ARB_depth_clamp". */
60 const char *name;
61
62 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
63 size_t offset;
64
65 /** Set of API's in which the extension exists, as a bitset. */
66 uint8_t api_set;
67
68 /** Year the extension was proposed or approved. Used to sort the
69 * extension string chronologically. */
70 uint16_t year;
71 };
72
73
74 /**
75 * Given a member \c x of struct gl_extensions, return offset of
76 * \c x in bytes.
77 */
78 #define o(x) offsetof(struct gl_extensions, x)
79
80
81 /**
82 * \brief Table of supported OpenGL extensions for all API's.
83 */
84 static const struct extension extension_table[] = {
85 /* ARB Extensions */
86 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 },
87 { "GL_ARB_ES3_compatibility", o(ARB_ES3_compatibility), GL, 2012 },
88 { "GL_ARB_arrays_of_arrays", o(ARB_arrays_of_arrays), GL, 2012 },
89 { "GL_ARB_base_instance", o(ARB_base_instance), GL, 2011 },
90 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 },
91 { "GL_ARB_buffer_storage", o(ARB_buffer_storage), GL, 2013 },
92 { "GL_ARB_clear_buffer_object", o(dummy_true), GL, 2012 },
93 { "GL_ARB_clear_texture", o(ARB_clear_texture), GL, 2013 },
94 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
95 { "GL_ARB_compressed_texture_pixel_storage", o(dummy_true), GL, 2011 },
96 { "GL_ARB_compute_shader", o(ARB_compute_shader), GL, 2012 },
97 { "GL_ARB_conditional_render_inverted", o(ARB_conditional_render_inverted), GL, 2014 },
98 { "GL_ARB_copy_buffer", o(dummy_true), GL, 2008 },
99 { "GL_ARB_copy_image", o(ARB_copy_image), GL, 2012 },
100 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
101 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 },
102 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
103 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
104 { "GL_ARB_depth_texture", o(ARB_depth_texture), GLL, 2001 },
105 { "GL_ARB_derivative_control", o(ARB_derivative_control), GL, 2014 },
106 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 },
107 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
108 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
109 { "GL_ARB_draw_indirect", o(ARB_draw_indirect), GLC, 2010 },
110 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
111 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
112 { "GL_ARB_explicit_uniform_location", o(ARB_explicit_uniform_location), GL, 2012 },
113 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
114 { "GL_ARB_fragment_layer_viewport", o(ARB_fragment_layer_viewport), GLC, 2012 },
115 { "GL_ARB_fragment_program", o(ARB_fragment_program), GLL, 2002 },
116 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GLL, 2003 },
117 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
118 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
119 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
120 { "GL_ARB_get_program_binary", o(dummy_true), GL, 2010 },
121 { "GL_ARB_gpu_shader5", o(ARB_gpu_shader5), GLC, 2010 },
122 { "GL_ARB_half_float_pixel", o(dummy_true), GL, 2003 },
123 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
124 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
125 { "GL_ARB_internalformat_query", o(ARB_internalformat_query), GL, 2011 },
126 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 },
127 { "GL_ARB_map_buffer_alignment", o(dummy_true), GL, 2011 },
128 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
129 { "GL_ARB_multi_bind", o(dummy_true), GL, 2013 },
130 { "GL_ARB_multi_draw_indirect", o(ARB_draw_indirect), GLC, 2012 },
131 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 },
132 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 },
133 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
134 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 },
135 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
136 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 },
137 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
138 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
139 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
140 { "GL_ARB_sample_shading", o(ARB_sample_shading), GL, 2009 },
141 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 },
142 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
143 { "GL_ARB_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2013 },
144 { "GL_ARB_separate_shader_objects", o(dummy_true), GL, 2010 },
145 { "GL_ARB_shader_atomic_counters", o(ARB_shader_atomic_counters), GL, 2011 },
146 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
147 { "GL_ARB_shader_image_load_store", o(ARB_shader_image_load_store), GL, 2011 },
148 { "GL_ARB_shader_objects", o(dummy_true), GL, 2002 },
149 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
150 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
151 { "GL_ARB_shading_language_100", o(dummy_true), GLL, 2003 },
152 { "GL_ARB_shading_language_packing", o(ARB_shading_language_packing), GL, 2011 },
153 { "GL_ARB_shading_language_420pack", o(ARB_shading_language_420pack), GL, 2011 },
154 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
155 { "GL_ARB_stencil_texturing", o(ARB_stencil_texturing), GL, 2012 },
156 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
157 { "GL_ARB_texture_barrier", o(NV_texture_barrier), GL, 2014 },
158 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
159 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GLC, 2008 },
160 { "GL_ARB_texture_buffer_object_rgb32", o(ARB_texture_buffer_object_rgb32), GLC, 2009 },
161 { "GL_ARB_texture_buffer_range", o(ARB_texture_buffer_range), GLC, 2012 },
162 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 },
163 { "GL_ARB_texture_compression_bptc", o(ARB_texture_compression_bptc), GL, 2010 },
164 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
165 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 },
166 { "GL_ARB_texture_cube_map_array", o(ARB_texture_cube_map_array), GL, 2009 },
167 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 },
168 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 },
169 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 },
170 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 },
171 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
172 { "GL_ARB_texture_gather", o(ARB_texture_gather), GL, 2009 },
173 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 },
174 { "GL_ARB_texture_mirror_clamp_to_edge", o(ARB_texture_mirror_clamp_to_edge), GL, 2013 },
175 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
176 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
177 { "GL_ARB_texture_query_levels", o(ARB_texture_query_levels), GL, 2012 },
178 { "GL_ARB_texture_query_lod", o(ARB_texture_query_lod), GL, 2009 },
179 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
180 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
181 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
182 { "GL_ARB_texture_storage", o(dummy_true), GL, 2011 },
183 { "GL_ARB_texture_storage_multisample", o(ARB_texture_multisample), GL, 2012 },
184 { "GL_ARB_texture_view", o(ARB_texture_view), GL, 2012 },
185 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
186 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
187 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
188 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
189 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
190 { "GL_ARB_transpose_matrix", o(dummy_true), GLL, 1999 },
191 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
192 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
193 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 },
194 { "GL_ARB_vertex_attrib_binding", o(dummy_true), GL, 2012 },
195 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 },
196 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 },
197 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
198 { "GL_ARB_vertex_type_10f_11f_11f_rev", o(ARB_vertex_type_10f_11f_11f_rev), GL, 2013 },
199 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
200 { "GL_ARB_viewport_array", o(ARB_viewport_array), GLC, 2010 },
201 { "GL_ARB_window_pos", o(dummy_true), GLL, 2001 },
202 /* EXT extensions */
203 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
204 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 },
205 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 },
206 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
207 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
208 { "GL_EXT_discard_framebuffer", o(dummy_true), ES1 | ES2, 2009 },
209 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 },
210 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 },
211 { "GL_EXT_compiled_vertex_array", o(dummy_true), GLL, 1996 },
212 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 },
213 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
214 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
215 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
216 { "GL_EXT_draw_range_elements", o(dummy_true), GLL, 1997 },
217 { "GL_EXT_fog_coord", o(dummy_true), GLL, 1999 },
218 { "GL_EXT_framebuffer_blit", o(dummy_true), GL, 2005 },
219 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
220 { "GL_EXT_framebuffer_multisample_blit_scaled", o(EXT_framebuffer_multisample_blit_scaled), GL, 2011 },
221 { "GL_EXT_framebuffer_object", o(dummy_true), GLL, 2000 },
222 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
223 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 },
224 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
225 { "GL_EXT_map_buffer_range", o(ARB_map_buffer_range), ES1 | ES2, 2012 },
226 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 },
227 { "GL_EXT_packed_depth_stencil", o(dummy_true), GL, 2005 },
228 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
229 { "GL_EXT_packed_pixels", o(dummy_true), GLL, 1997 },
230 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
231 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 },
232 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 },
233 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
234 { "GL_EXT_rescale_normal", o(dummy_true), GLL, 1997 },
235 { "GL_EXT_secondary_color", o(dummy_true), GLL, 1999 },
236 { "GL_EXT_separate_shader_objects", o(dummy_true), ES2, 2013 },
237 { "GL_EXT_separate_specular_color", o(dummy_true), GLL, 1997 },
238 { "GL_EXT_shader_integer_mix", o(EXT_shader_integer_mix), GL | ES3, 2013 },
239 { "GL_EXT_shadow_funcs", o(ARB_shadow), GLL, 2002 },
240 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 },
241 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 },
242 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 },
243 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 },
244 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
245 { "GL_EXT_texture_compression_dxt1", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2004 },
246 { "GL_ANGLE_texture_compression_dxt3", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
247 { "GL_ANGLE_texture_compression_dxt5", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
248 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
249 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
250 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
251 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 },
252 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 },
253 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 },
254 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 },
255 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 },
256 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
257 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
258 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
259 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
260 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
261 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 },
262 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
263 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 },
264 { "GL_EXT_texture", o(dummy_true), GLL, 1996 },
265 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 },
266 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
267 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
268 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
269 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
270 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
271 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
272 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
273 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
274 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
275 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
276 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 },
277 { "GL_EXT_color_buffer_float", o(dummy_true), ES3, 2013 },
278
279 /* OES extensions */
280 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
281 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
282 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
283 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
284 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
285 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
286 { "GL_OES_depth24", o(dummy_true), ES1 | ES2, 2005 },
287 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
288 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
289 { "GL_OES_depth_texture_cube_map", o(OES_depth_texture_cube_map), ES2, 2012 },
290 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
291 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
292 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
293 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
294 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
295 { "GL_OES_fbo_render_mipmap", o(dummy_true), ES1 | ES2, 2005 },
296 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
297 { "GL_OES_framebuffer_object", o(dummy_true), ES1, 2005 },
298 { "GL_OES_get_program_binary", o(dummy_true), ES2, 2008 },
299 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
300 { "GL_OES_packed_depth_stencil", o(dummy_true), ES1 | ES2, 2007 },
301 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
302 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
303 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
304 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
305 { "GL_OES_rgb8_rgba8", o(dummy_true), ES1 | ES2, 2005 },
306 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
307 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
308 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
309 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
310 { "GL_OES_stencil8", o(dummy_true), ES1 | ES2, 2005 },
311 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
312 { "GL_OES_surfaceless_context", o(dummy_true), ES1 | ES2, 2012 },
313 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
314 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
315 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
316 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
317 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES1 | ES2, 2005 },
318 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 },
319
320 /* KHR extensions */
321 { "GL_KHR_debug", o(dummy_true), GL, 2012 },
322
323 /* Vendor extensions */
324 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
325 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
326 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
327 { "GL_AMD_performance_monitor", o(AMD_performance_monitor), GL, 2007 },
328 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
329 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
330 { "GL_AMD_shader_trinary_minmax", o(dummy_true), GL, 2012 },
331 { "GL_AMD_vertex_shader_layer", o(AMD_vertex_shader_layer), GLC, 2012 },
332 { "GL_AMD_vertex_shader_viewport_index", o(AMD_vertex_shader_viewport_index), GLC, 2012 },
333 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
334 { "GL_APPLE_packed_pixels", o(dummy_true), GLL, 2002 },
335 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 },
336 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 },
337 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
338 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 },
339 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 },
340 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 },
341 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
342 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 },
343 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
344 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
345 { "GL_IBM_multimode_draw_arrays", o(dummy_true), GL, 1998 },
346 { "GL_IBM_rasterpos_clip", o(dummy_true), GLL, 1996 },
347 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 },
348 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
349 { "GL_INTEL_performance_query", o(INTEL_performance_query), GL | ES2, 2013 },
350 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
351 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
352 { "GL_MESA_window_pos", o(dummy_true), GLL, 2000 },
353 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
354 { "GL_NV_blend_square", o(dummy_true), GLL, 1999 },
355 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
356 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
357 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
358 { "GL_NV_fbo_color_attachments", o(dummy_true), ES2, 2010 },
359 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 },
360 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 },
361 { "GL_NV_light_max_exponent", o(dummy_true), GLL, 1999 },
362 { "GL_NV_packed_depth_stencil", o(dummy_true), GL, 2000 },
363 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
364 { "GL_NV_primitive_restart", o(NV_primitive_restart), GLL, 2002 },
365 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
366 { "GL_NV_texgen_reflection", o(dummy_true), GLL, 1999 },
367 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
368 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 },
369 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 },
370 { "GL_NV_vdpau_interop", o(NV_vdpau_interop), GL, 2010 },
371 { "GL_S3_s3tc", o(ANGLE_texture_compression_dxt), GL, 1999 },
372 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 },
373 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 },
374 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 },
375 { "GL_SGIS_texture_lod", o(dummy_true), GLL, 1997 },
376 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 },
377
378 { 0, 0, 0, 0 },
379 };
380
381
382 /**
383 * Given an extension name, lookup up the corresponding member of struct
384 * gl_extensions and return that member's offset (in bytes). If the name is
385 * not found in the \c extension_table, return 0.
386 *
387 * \param name Name of extension.
388 * \return Offset of member in struct gl_extensions.
389 */
390 static size_t
391 name_to_offset(const char* name)
392 {
393 const struct extension *i;
394
395 if (name == 0)
396 return 0;
397
398 for (i = extension_table; i->name != 0; ++i) {
399 if (strcmp(name, i->name) == 0)
400 return i->offset;
401 }
402
403 return 0;
404 }
405
406 /**
407 * Overrides extensions in \c ctx based on the values in
408 * _mesa_extension_override_enables and _mesa_extension_override_disables.
409 */
410 static void
411 override_extensions_in_context(struct gl_context *ctx)
412 {
413 const struct extension *i;
414 const GLboolean *enables =
415 (GLboolean*) &_mesa_extension_override_enables;
416 const GLboolean *disables =
417 (GLboolean*) &_mesa_extension_override_disables;
418 GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions;
419
420 for (i = extension_table; i->name != 0; ++i) {
421 size_t offset = i->offset;
422 assert(!enables[offset] || !disables[offset]);
423 if (enables[offset]) {
424 ctx_ext[offset] = 1;
425 } else if (disables[offset]) {
426 ctx_ext[offset] = 0;
427 }
428 }
429 }
430
431
432 /**
433 * Enable all extensions suitable for a software-only renderer.
434 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
435 */
436 void
437 _mesa_enable_sw_extensions(struct gl_context *ctx)
438 {
439 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
440 ctx->Extensions.ARB_depth_texture = GL_TRUE;
441 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
442 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
443 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
444 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
445 ctx->Extensions.ARB_fragment_program = GL_TRUE;
446 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
447 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
448 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
449 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
450 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
451 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
452 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
453 ctx->Extensions.ARB_point_sprite = GL_TRUE;
454 ctx->Extensions.ARB_shadow = GL_TRUE;
455 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
456 ctx->Extensions.ARB_texture_compression_bptc = GL_TRUE;
457 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
458 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
459 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
460 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
461 #ifdef TEXTURE_FLOAT_ENABLED
462 ctx->Extensions.ARB_texture_float = GL_TRUE;
463 #endif
464 ctx->Extensions.ARB_texture_mirror_clamp_to_edge = GL_TRUE;
465 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
466 ctx->Extensions.ARB_texture_rg = GL_TRUE;
467 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
468 ctx->Extensions.ARB_vertex_program = GL_TRUE;
469 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
470 ctx->Extensions.ARB_sync = GL_TRUE;
471 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
472 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
473 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
474 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
475 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
476 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
477 ctx->Extensions.EXT_blend_color = GL_TRUE;
478 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
479 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
480 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
481 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
482 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
483 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
484 ctx->Extensions.EXT_point_parameters = GL_TRUE;
485 ctx->Extensions.EXT_provoking_vertex = 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 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
494 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
495 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
496 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
497 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
498 ctx->Extensions.MESA_pack_invert = GL_TRUE;
499 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
500 ctx->Extensions.NV_conditional_render = GL_TRUE;
501 ctx->Extensions.NV_point_sprite = GL_TRUE;
502 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
503 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
504 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
505 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
506 ctx->Extensions.OES_standard_derivatives = GL_TRUE;
507 ctx->Extensions.TDFX_texture_compression_FXT1 = GL_TRUE;
508 if (ctx->Mesa_DXTn) {
509 ctx->Extensions.ANGLE_texture_compression_dxt = GL_TRUE;
510 ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
511 }
512 }
513
514 /**
515 * Either enable or disable the named extension.
516 * \return offset of extensions withint `ext' or 0 if extension is not known
517 */
518 static size_t
519 set_extension(struct gl_extensions *ext, const char *name, GLboolean state)
520 {
521 size_t offset;
522
523 offset = name_to_offset(name);
524 if (offset != 0 && (offset != o(dummy_true) || state != GL_FALSE)) {
525 ((GLboolean *) ext)[offset] = state;
526 }
527
528 return offset;
529 }
530
531 /**
532 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
533 *
534 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
535 * enable or disable. The list is processed thus:
536 * - Enable recognized extension names that are prefixed with '+'.
537 * - Disable recognized extension names that are prefixed with '-'.
538 * - Enable recognized extension names that are not prefixed.
539 * - Collect unrecognized extension names in a new string.
540 *
541 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
542 * _mesa_one_time_init_extension_overrides. We just use the results of that
543 * parsing in this function.
544 *
545 * \return Space-separated list of unrecognized extension names (which must
546 * be freed). Does not return \c NULL.
547 */
548 static char *
549 get_extension_override( struct gl_context *ctx )
550 {
551 override_extensions_in_context(ctx);
552
553 if (cant_disable_extensions != NULL) {
554 _mesa_problem(ctx,
555 "Trying to disable permanently enabled extensions: %s",
556 cant_disable_extensions);
557 }
558
559 if (extra_extensions == NULL) {
560 return calloc(1, sizeof(char));
561 } else {
562 _mesa_problem(ctx, "Trying to enable unknown extensions: %s",
563 extra_extensions);
564 return strdup(extra_extensions);
565 }
566 }
567
568
569 /**
570 * \brief Free extra_extensions and cant_disable_extensions strings
571 *
572 * These strings are allocated early during the first context creation by
573 * _mesa_one_time_init_extension_overrides.
574 */
575 static void
576 free_unknown_extensions_strings(void)
577 {
578 free(extra_extensions);
579 free(cant_disable_extensions);
580 }
581
582
583 /**
584 * \brief Initialize extension override tables.
585 *
586 * This should be called one time early during first context initialization.
587 */
588 void
589 _mesa_one_time_init_extension_overrides(void)
590 {
591 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
592 char *env;
593 char *ext;
594 int len;
595 size_t offset;
596
597 atexit(free_unknown_extensions_strings);
598
599 memset(&_mesa_extension_override_enables, 0, sizeof(struct gl_extensions));
600 memset(&_mesa_extension_override_disables, 0, sizeof(struct gl_extensions));
601
602 if (env_const == NULL) {
603 return;
604 }
605
606 /* extra_exts: List of unrecognized extensions. */
607 extra_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
608 cant_disable_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
609
610 /* Copy env_const because strtok() is destructive. */
611 env = strdup(env_const);
612
613 if (env == NULL || extra_extensions == NULL ||
614 cant_disable_extensions == NULL) {
615 free(env);
616 free(extra_extensions);
617 free(cant_disable_extensions);
618 return;
619 }
620
621 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
622 int enable;
623 bool recognized;
624 switch (ext[0]) {
625 case '+':
626 enable = 1;
627 ++ext;
628 break;
629 case '-':
630 enable = 0;
631 ++ext;
632 break;
633 default:
634 enable = 1;
635 break;
636 }
637
638 offset = set_extension(&_mesa_extension_override_enables, ext, enable);
639 if (offset != 0 && (offset != o(dummy_true) || enable != GL_FALSE)) {
640 ((GLboolean *) &_mesa_extension_override_disables)[offset] = !enable;
641 recognized = true;
642 } else {
643 recognized = false;
644 }
645
646 if (!recognized) {
647 if (enable) {
648 strcat(extra_extensions, ext);
649 strcat(extra_extensions, " ");
650 } else if (offset == o(dummy_true)) {
651 strcat(cant_disable_extensions, ext);
652 strcat(cant_disable_extensions, " ");
653 }
654 }
655 }
656
657 free(env);
658
659 /* Remove trailing space, and free if unused. */
660 len = strlen(extra_extensions);
661 if (len == 0) {
662 free(extra_extensions);
663 extra_extensions = NULL;
664 } else if (extra_extensions[len - 1] == ' ') {
665 extra_extensions[len - 1] = '\0';
666 }
667 len = strlen(cant_disable_extensions);
668 if (len == 0) {
669 free(cant_disable_extensions);
670 cant_disable_extensions = NULL;
671 } else if (cant_disable_extensions[len - 1] == ' ') {
672 cant_disable_extensions[len - 1] = '\0';
673 }
674 }
675
676
677 /**
678 * \brief Initialize extension tables and enable default extensions.
679 *
680 * This should be called during context initialization.
681 * Note: Sets gl_extensions.dummy_true to true.
682 */
683 void
684 _mesa_init_extensions(struct gl_extensions *extensions)
685 {
686 GLboolean *base = (GLboolean *) extensions;
687 GLboolean *sentinel = base + o(extension_sentinel);
688 GLboolean *i;
689
690 /* First, turn all extensions off. */
691 for (i = base; i != sentinel; ++i)
692 *i = GL_FALSE;
693
694 /* Then, selectively turn default extensions on. */
695 extensions->dummy_true = GL_TRUE;
696 extensions->EXT_texture3D = GL_TRUE;
697 }
698
699
700 typedef unsigned short extension_index;
701
702
703 /**
704 * Compare two entries of the extensions table. Sorts first by year,
705 * then by name.
706 *
707 * Arguments are indices into extension_table.
708 */
709 static int
710 extension_compare(const void *p1, const void *p2)
711 {
712 extension_index i1 = * (const extension_index *) p1;
713 extension_index i2 = * (const extension_index *) p2;
714 const struct extension *e1 = &extension_table[i1];
715 const struct extension *e2 = &extension_table[i2];
716 int res;
717
718 res = (int)e1->year - (int)e2->year;
719
720 if (res == 0) {
721 res = strcmp(e1->name, e2->name);
722 }
723
724 return res;
725 }
726
727
728 /**
729 * Construct the GL_EXTENSIONS string. Called the first time that
730 * glGetString(GL_EXTENSIONS) is called.
731 */
732 GLubyte*
733 _mesa_make_extension_string(struct gl_context *ctx)
734 {
735 /* The extension string. */
736 char *exts = 0;
737 /* Length of extension string. */
738 size_t length = 0;
739 /* Number of extensions */
740 unsigned count;
741 /* Indices of the extensions sorted by year */
742 extension_index *extension_indices;
743 /* String of extra extensions. */
744 char *extra_extensions = get_extension_override(ctx);
745 GLboolean *base = (GLboolean *) &ctx->Extensions;
746 const struct extension *i;
747 unsigned j;
748 unsigned maxYear = ~0;
749 unsigned api_set = (1 << ctx->API);
750 if (_mesa_is_gles3(ctx))
751 api_set |= ES3;
752
753 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
754 {
755 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
756 if (env) {
757 maxYear = atoi(env);
758 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
759 maxYear);
760 }
761 }
762
763 /* Compute length of the extension string. */
764 count = 0;
765 for (i = extension_table; i->name != 0; ++i) {
766 if (base[i->offset] &&
767 i->year <= maxYear &&
768 (i->api_set & api_set)) {
769 length += strlen(i->name) + 1; /* +1 for space */
770 ++count;
771 }
772 }
773 if (extra_extensions != NULL)
774 length += 1 + strlen(extra_extensions); /* +1 for space */
775
776 exts = calloc(ALIGN(length + 1, 4), sizeof(char));
777 if (exts == NULL) {
778 free(extra_extensions);
779 return NULL;
780 }
781
782 extension_indices = malloc(count * sizeof(extension_index));
783 if (extension_indices == NULL) {
784 free(exts);
785 free(extra_extensions);
786 return NULL;
787 }
788
789 /* Sort extensions in chronological order because certain old applications
790 * (e.g., Quake3 demo) store the extension list in a static size buffer so
791 * chronologically order ensure that the extensions that such applications
792 * expect will fit into that buffer.
793 */
794 j = 0;
795 for (i = extension_table; i->name != 0; ++i) {
796 if (base[i->offset] &&
797 i->year <= maxYear &&
798 (i->api_set & api_set)) {
799 extension_indices[j++] = i - extension_table;
800 }
801 }
802 assert(j == count);
803 qsort(extension_indices, count,
804 sizeof *extension_indices, extension_compare);
805
806 /* Build the extension string.*/
807 for (j = 0; j < count; ++j) {
808 i = &extension_table[extension_indices[j]];
809 assert(base[i->offset] && (i->api_set & api_set));
810 strcat(exts, i->name);
811 strcat(exts, " ");
812 }
813 free(extension_indices);
814 if (extra_extensions != 0) {
815 strcat(exts, extra_extensions);
816 free(extra_extensions);
817 }
818
819 return (GLubyte *) exts;
820 }
821
822 /**
823 * Return number of enabled extensions.
824 */
825 GLuint
826 _mesa_get_extension_count(struct gl_context *ctx)
827 {
828 GLboolean *base;
829 const struct extension *i;
830 unsigned api_set = (1 << ctx->API);
831 if (_mesa_is_gles3(ctx))
832 api_set |= ES3;
833
834 /* only count once */
835 if (ctx->Extensions.Count != 0)
836 return ctx->Extensions.Count;
837
838 base = (GLboolean *) &ctx->Extensions;
839 for (i = extension_table; i->name != 0; ++i) {
840 if (base[i->offset] && (i->api_set & api_set)) {
841 ctx->Extensions.Count++;
842 }
843 }
844 return ctx->Extensions.Count;
845 }
846
847 /**
848 * Return name of i-th enabled extension
849 */
850 const GLubyte *
851 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
852 {
853 const GLboolean *base;
854 size_t n;
855 const struct extension *i;
856 unsigned api_set = (1 << ctx->API);
857 if (_mesa_is_gles3(ctx))
858 api_set |= ES3;
859
860 base = (GLboolean*) &ctx->Extensions;
861 n = 0;
862 for (i = extension_table; i->name != 0; ++i) {
863 if (base[i->offset] && (i->api_set & api_set)) {
864 if (n == index)
865 return (const GLubyte*) i->name;
866 else
867 ++n;
868 }
869 }
870
871 return NULL;
872 }