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mesa: enable GL_ARB_get_texture_sub_image for all drivers
[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_clip_control", o(ARB_clip_control), GL, 2014 },
95 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
96 { "GL_ARB_compressed_texture_pixel_storage", o(dummy_true), GL, 2011 },
97 { "GL_ARB_compute_shader", o(ARB_compute_shader), GL, 2012 },
98 { "GL_ARB_conditional_render_inverted", o(ARB_conditional_render_inverted), GL, 2014 },
99 { "GL_ARB_copy_buffer", o(dummy_true), GL, 2008 },
100 { "GL_ARB_copy_image", o(ARB_copy_image), GL, 2012 },
101 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
102 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 },
103 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
104 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
105 { "GL_ARB_depth_texture", o(ARB_depth_texture), GLL, 2001 },
106 { "GL_ARB_derivative_control", o(ARB_derivative_control), GL, 2014 },
107 { "GL_ARB_direct_state_access", o(dummy_true), GLC, 2014 },
108 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 },
109 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
110 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
111 { "GL_ARB_draw_indirect", o(ARB_draw_indirect), GLC, 2010 },
112 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
113 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
114 { "GL_ARB_explicit_uniform_location", o(ARB_explicit_uniform_location), GL, 2012 },
115 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
116 { "GL_ARB_fragment_layer_viewport", o(ARB_fragment_layer_viewport), GLC, 2012 },
117 { "GL_ARB_fragment_program", o(ARB_fragment_program), GLL, 2002 },
118 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GLL, 2003 },
119 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
120 { "GL_ARB_framebuffer_no_attachments", o(ARB_framebuffer_no_attachments), GL, 2012 },
121 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
122 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
123 { "GL_ARB_get_program_binary", o(dummy_true), GL, 2010 },
124 { "GL_ARB_get_texture_sub_image", o(dummy_true), GL, 2014 },
125 { "GL_ARB_gpu_shader5", o(ARB_gpu_shader5), GLC, 2010 },
126 { "GL_ARB_gpu_shader_fp64", o(ARB_gpu_shader_fp64), GLC, 2010 },
127 { "GL_ARB_half_float_pixel", o(dummy_true), GL, 2003 },
128 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
129 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
130 { "GL_ARB_internalformat_query", o(ARB_internalformat_query), GL, 2011 },
131 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 },
132 { "GL_ARB_map_buffer_alignment", o(dummy_true), GL, 2011 },
133 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
134 { "GL_ARB_multi_bind", o(dummy_true), GL, 2013 },
135 { "GL_ARB_multi_draw_indirect", o(ARB_draw_indirect), GLC, 2012 },
136 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 },
137 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 },
138 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
139 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 },
140 { "GL_ARB_pipeline_statistics_query", o(ARB_pipeline_statistics_query), GL, 2014 },
141 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
142 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 },
143 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
144 { "GL_ARB_program_interface_query", o(dummy_true), GL, 2012 },
145 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
146 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
147 { "GL_ARB_sample_shading", o(ARB_sample_shading), GL, 2009 },
148 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 },
149 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
150 { "GL_ARB_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2013 },
151 { "GL_ARB_separate_shader_objects", o(dummy_true), GL, 2010 },
152 { "GL_ARB_shader_atomic_counters", o(ARB_shader_atomic_counters), GL, 2011 },
153 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
154 { "GL_ARB_shader_image_load_store", o(ARB_shader_image_load_store), GL, 2011 },
155 { "GL_ARB_shader_objects", o(dummy_true), GL, 2002 },
156 { "GL_ARB_shader_precision", o(ARB_shader_precision), GL, 2010 },
157 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
158 { "GL_ARB_shader_storage_buffer_object", o(ARB_shader_storage_buffer_object), GL, 2012 },
159 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
160 { "GL_ARB_shading_language_100", o(dummy_true), GLL, 2003 },
161 { "GL_ARB_shading_language_packing", o(ARB_shading_language_packing), GL, 2011 },
162 { "GL_ARB_shading_language_420pack", o(ARB_shading_language_420pack), GL, 2011 },
163 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
164 { "GL_ARB_stencil_texturing", o(ARB_stencil_texturing), GL, 2012 },
165 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
166 { "GL_ARB_texture_barrier", o(NV_texture_barrier), GL, 2014 },
167 { "GL_ARB_tessellation_shader", o(ARB_tessellation_shader), GLC, 2009 },
168 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
169 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GLC, 2008 },
170 { "GL_ARB_texture_buffer_object_rgb32", o(ARB_texture_buffer_object_rgb32), GLC, 2009 },
171 { "GL_ARB_texture_buffer_range", o(ARB_texture_buffer_range), GLC, 2012 },
172 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 },
173 { "GL_ARB_texture_compression_bptc", o(ARB_texture_compression_bptc), GL, 2010 },
174 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
175 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 },
176 { "GL_ARB_texture_cube_map_array", o(ARB_texture_cube_map_array), GL, 2009 },
177 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 },
178 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 },
179 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 },
180 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 },
181 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
182 { "GL_ARB_texture_gather", o(ARB_texture_gather), GL, 2009 },
183 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 },
184 { "GL_ARB_texture_mirror_clamp_to_edge", o(ARB_texture_mirror_clamp_to_edge), GL, 2013 },
185 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
186 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
187 { "GL_ARB_texture_query_levels", o(ARB_texture_query_levels), GL, 2012 },
188 { "GL_ARB_texture_query_lod", o(ARB_texture_query_lod), GL, 2009 },
189 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
190 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
191 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
192 { "GL_ARB_texture_stencil8", o(ARB_texture_stencil8), GL, 2013 },
193 { "GL_ARB_texture_storage", o(dummy_true), GL, 2011 },
194 { "GL_ARB_texture_storage_multisample", o(ARB_texture_multisample), GL, 2012 },
195 { "GL_ARB_texture_view", o(ARB_texture_view), GL, 2012 },
196 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
197 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
198 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
199 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
200 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
201 { "GL_ARB_transpose_matrix", o(dummy_true), GLL, 1999 },
202 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
203 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
204 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 },
205 { "GL_ARB_vertex_attrib_binding", o(dummy_true), GL, 2012 },
206 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 },
207 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 },
208 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
209 { "GL_ARB_vertex_attrib_64bit", o(ARB_vertex_attrib_64bit), GLC, 2010 },
210 { "GL_ARB_vertex_type_10f_11f_11f_rev", o(ARB_vertex_type_10f_11f_11f_rev), GL, 2013 },
211 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
212 { "GL_ARB_viewport_array", o(ARB_viewport_array), GLC, 2010 },
213 { "GL_ARB_window_pos", o(dummy_true), GLL, 2001 },
214 /* EXT extensions */
215 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
216 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 },
217 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 },
218 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
219 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
220 { "GL_EXT_discard_framebuffer", o(dummy_true), ES1 | ES2, 2009 },
221 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 },
222 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 },
223 { "GL_EXT_compiled_vertex_array", o(dummy_true), GLL, 1996 },
224 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 },
225 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
226 { "GL_EXT_draw_buffers", o(dummy_true), ES2, 2012 },
227 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
228 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
229 { "GL_EXT_draw_range_elements", o(dummy_true), GLL, 1997 },
230 { "GL_EXT_fog_coord", o(dummy_true), GLL, 1999 },
231 { "GL_EXT_framebuffer_blit", o(dummy_true), GL, 2005 },
232 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
233 { "GL_EXT_framebuffer_multisample_blit_scaled", o(EXT_framebuffer_multisample_blit_scaled), GL, 2011 },
234 { "GL_EXT_framebuffer_object", o(dummy_true), GLL, 2000 },
235 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
236 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 },
237 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
238 { "GL_EXT_map_buffer_range", o(ARB_map_buffer_range), ES1 | ES2, 2012 },
239 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 },
240 { "GL_EXT_packed_depth_stencil", o(dummy_true), GL, 2005 },
241 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
242 { "GL_EXT_packed_pixels", o(dummy_true), GLL, 1997 },
243 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
244 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 },
245 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 },
246 { "GL_EXT_polygon_offset_clamp", o(EXT_polygon_offset_clamp), GL, 2014 },
247 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
248 { "GL_EXT_rescale_normal", o(dummy_true), GLL, 1997 },
249 { "GL_EXT_secondary_color", o(dummy_true), GLL, 1999 },
250 { "GL_EXT_separate_shader_objects", o(dummy_true), ES2, 2013 },
251 { "GL_EXT_separate_specular_color", o(dummy_true), GLL, 1997 },
252 { "GL_EXT_shader_integer_mix", o(EXT_shader_integer_mix), GL | ES3, 2013 },
253 { "GL_EXT_shadow_funcs", o(ARB_shadow), GLL, 2002 },
254 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 },
255 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 },
256 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 },
257 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 },
258 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
259 { "GL_EXT_texture_compression_dxt1", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2004 },
260 { "GL_ANGLE_texture_compression_dxt3", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
261 { "GL_ANGLE_texture_compression_dxt5", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
262 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
263 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
264 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
265 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 },
266 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 },
267 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 },
268 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 },
269 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 },
270 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
271 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
272 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
273 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
274 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
275 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 },
276 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
277 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 },
278 { "GL_EXT_texture", o(dummy_true), GLL, 1996 },
279 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 },
280 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
281 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
282 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
283 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
284 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
285 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
286 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
287 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
288 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
289 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
290 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 },
291 { "GL_EXT_color_buffer_float", o(dummy_true), ES3, 2013 },
292
293 /* OES extensions */
294 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
295 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
296 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
297 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
298 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
299 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
300 { "GL_OES_depth24", o(dummy_true), ES1 | ES2, 2005 },
301 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
302 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
303 { "GL_OES_depth_texture_cube_map", o(OES_depth_texture_cube_map), ES2, 2012 },
304 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
305 { "GL_OES_EGL_sync", o(dummy_true), ES1 | ES2, 2010 },
306 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
307 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
308 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
309 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
310 { "GL_OES_fbo_render_mipmap", o(dummy_true), ES1 | ES2, 2005 },
311 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
312 { "GL_OES_framebuffer_object", o(dummy_true), ES1, 2005 },
313 { "GL_OES_get_program_binary", o(dummy_true), ES2, 2008 },
314 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
315 { "GL_OES_packed_depth_stencil", o(dummy_true), ES1 | ES2, 2007 },
316 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
317 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
318 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
319 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
320 { "GL_OES_rgb8_rgba8", o(dummy_true), ES1 | ES2, 2005 },
321 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
322 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
323 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
324 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
325 { "GL_OES_stencil8", o(dummy_true), ES1 | ES2, 2005 },
326 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
327 { "GL_OES_surfaceless_context", o(dummy_true), ES1 | ES2, 2012 },
328 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
329 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
330 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
331 { "GL_OES_texture_float", o(OES_texture_float), ES2, 2005 },
332 { "GL_OES_texture_float_linear", o(OES_texture_float_linear), ES2, 2005 },
333 { "GL_OES_texture_half_float", o(OES_texture_half_float), ES2, 2005 },
334 { "GL_OES_texture_half_float_linear", o(OES_texture_half_float_linear), ES2, 2005 },
335 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
336 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES1 | ES2, 2005 },
337 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 },
338
339 /* KHR extensions */
340 { "GL_KHR_debug", o(dummy_true), GL, 2012 },
341 { "GL_KHR_context_flush_control", o(dummy_true), GL | ES2, 2014 },
342
343 /* Vendor extensions */
344 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
345 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
346 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
347 { "GL_AMD_performance_monitor", o(AMD_performance_monitor), GL, 2007 },
348 { "GL_AMD_pinned_memory", o(AMD_pinned_memory), GL, 2013 },
349 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
350 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
351 { "GL_AMD_shader_trinary_minmax", o(dummy_true), GL, 2012 },
352 { "GL_AMD_vertex_shader_layer", o(AMD_vertex_shader_layer), GLC, 2012 },
353 { "GL_AMD_vertex_shader_viewport_index", o(AMD_vertex_shader_viewport_index), GLC, 2012 },
354 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
355 { "GL_APPLE_packed_pixels", o(dummy_true), GLL, 2002 },
356 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 },
357 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 },
358 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
359 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 },
360 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 },
361 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 },
362 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
363 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 },
364 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
365 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
366 { "GL_IBM_multimode_draw_arrays", o(dummy_true), GL, 1998 },
367 { "GL_IBM_rasterpos_clip", o(dummy_true), GLL, 1996 },
368 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 },
369 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
370 { "GL_INTEL_performance_query", o(INTEL_performance_query), GL | ES2, 2013 },
371 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
372 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
373 { "GL_MESA_window_pos", o(dummy_true), GLL, 2000 },
374 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
375 { "GL_NV_blend_square", o(dummy_true), GLL, 1999 },
376 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
377 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
378 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
379 { "GL_NV_fbo_color_attachments", o(dummy_true), ES2, 2010 },
380 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 },
381 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 },
382 { "GL_NV_light_max_exponent", o(dummy_true), GLL, 1999 },
383 { "GL_NV_packed_depth_stencil", o(dummy_true), GL, 2000 },
384 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
385 { "GL_NV_primitive_restart", o(NV_primitive_restart), GLL, 2002 },
386 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
387 { "GL_NV_texgen_reflection", o(dummy_true), GLL, 1999 },
388 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
389 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 },
390 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 },
391 { "GL_NV_vdpau_interop", o(NV_vdpau_interop), GL, 2010 },
392 { "GL_S3_s3tc", o(ANGLE_texture_compression_dxt), GL, 1999 },
393 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 },
394 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 },
395 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 },
396 { "GL_SGIS_texture_lod", o(dummy_true), GLL, 1997 },
397 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 },
398
399 { 0, 0, 0, 0 },
400 };
401
402
403 /**
404 * Given an extension name, lookup up the corresponding member of struct
405 * gl_extensions and return that member's offset (in bytes). If the name is
406 * not found in the \c extension_table, return 0.
407 *
408 * \param name Name of extension.
409 * \return Offset of member in struct gl_extensions.
410 */
411 static size_t
412 name_to_offset(const char* name)
413 {
414 const struct extension *i;
415
416 if (name == 0)
417 return 0;
418
419 for (i = extension_table; i->name != 0; ++i) {
420 if (strcmp(name, i->name) == 0)
421 return i->offset;
422 }
423
424 return 0;
425 }
426
427 /**
428 * Overrides extensions in \c ctx based on the values in
429 * _mesa_extension_override_enables and _mesa_extension_override_disables.
430 */
431 static void
432 override_extensions_in_context(struct gl_context *ctx)
433 {
434 const struct extension *i;
435 const GLboolean *enables =
436 (GLboolean*) &_mesa_extension_override_enables;
437 const GLboolean *disables =
438 (GLboolean*) &_mesa_extension_override_disables;
439 GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions;
440
441 for (i = extension_table; i->name != 0; ++i) {
442 size_t offset = i->offset;
443 assert(!enables[offset] || !disables[offset]);
444 if (enables[offset]) {
445 ctx_ext[offset] = 1;
446 } else if (disables[offset]) {
447 ctx_ext[offset] = 0;
448 }
449 }
450 }
451
452
453 /**
454 * Enable all extensions suitable for a software-only renderer.
455 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
456 */
457 void
458 _mesa_enable_sw_extensions(struct gl_context *ctx)
459 {
460 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
461 ctx->Extensions.ARB_depth_texture = GL_TRUE;
462 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
463 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
464 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
465 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
466 ctx->Extensions.ARB_fragment_program = GL_TRUE;
467 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
468 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
469 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
470 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
471 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
472 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
473 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
474 ctx->Extensions.ARB_point_sprite = GL_TRUE;
475 ctx->Extensions.ARB_shadow = GL_TRUE;
476 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
477 ctx->Extensions.ARB_texture_compression_bptc = GL_TRUE;
478 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
479 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
480 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
481 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
482 #ifdef TEXTURE_FLOAT_ENABLED
483 ctx->Extensions.ARB_texture_float = GL_TRUE;
484 #endif
485 ctx->Extensions.ARB_texture_mirror_clamp_to_edge = GL_TRUE;
486 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
487 ctx->Extensions.ARB_texture_rg = GL_TRUE;
488 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
489 ctx->Extensions.ARB_vertex_program = GL_TRUE;
490 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
491 ctx->Extensions.ARB_sync = GL_TRUE;
492 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
493 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
494 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
495 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
496 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
497 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
498 ctx->Extensions.EXT_blend_color = GL_TRUE;
499 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
500 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
501 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
502 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
503 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
504 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
505 ctx->Extensions.EXT_point_parameters = GL_TRUE;
506 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
507 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
508 ctx->Extensions.EXT_texture_array = GL_TRUE;
509 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
510 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
511 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
512 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
513 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
514 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
515 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
516 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
517 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
518 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
519 ctx->Extensions.MESA_pack_invert = GL_TRUE;
520 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
521 ctx->Extensions.NV_conditional_render = GL_TRUE;
522 ctx->Extensions.NV_point_sprite = GL_TRUE;
523 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
524 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
525 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
526 ctx->Extensions.OES_standard_derivatives = GL_TRUE;
527 ctx->Extensions.TDFX_texture_compression_FXT1 = GL_TRUE;
528 if (ctx->Mesa_DXTn) {
529 ctx->Extensions.ANGLE_texture_compression_dxt = GL_TRUE;
530 ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
531 }
532 }
533
534 /**
535 * Either enable or disable the named extension.
536 * \return offset of extensions withint `ext' or 0 if extension is not known
537 */
538 static size_t
539 set_extension(struct gl_extensions *ext, const char *name, GLboolean state)
540 {
541 size_t offset;
542
543 offset = name_to_offset(name);
544 if (offset != 0 && (offset != o(dummy_true) || state != GL_FALSE)) {
545 ((GLboolean *) ext)[offset] = state;
546 }
547
548 return offset;
549 }
550
551 /**
552 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
553 *
554 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
555 * enable or disable. The list is processed thus:
556 * - Enable recognized extension names that are prefixed with '+'.
557 * - Disable recognized extension names that are prefixed with '-'.
558 * - Enable recognized extension names that are not prefixed.
559 * - Collect unrecognized extension names in a new string.
560 *
561 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
562 * _mesa_one_time_init_extension_overrides. We just use the results of that
563 * parsing in this function.
564 *
565 * \return Space-separated list of unrecognized extension names (which must
566 * be freed). Does not return \c NULL.
567 */
568 static char *
569 get_extension_override( struct gl_context *ctx )
570 {
571 override_extensions_in_context(ctx);
572
573 if (cant_disable_extensions != NULL) {
574 _mesa_problem(ctx,
575 "Trying to disable permanently enabled extensions: %s",
576 cant_disable_extensions);
577 }
578
579 if (extra_extensions == NULL) {
580 return calloc(1, sizeof(char));
581 } else {
582 _mesa_problem(ctx, "Trying to enable unknown extensions: %s",
583 extra_extensions);
584 return strdup(extra_extensions);
585 }
586 }
587
588
589 /**
590 * \brief Free extra_extensions and cant_disable_extensions strings
591 *
592 * These strings are allocated early during the first context creation by
593 * _mesa_one_time_init_extension_overrides.
594 */
595 static void
596 free_unknown_extensions_strings(void)
597 {
598 free(extra_extensions);
599 free(cant_disable_extensions);
600 }
601
602
603 /**
604 * \brief Initialize extension override tables.
605 *
606 * This should be called one time early during first context initialization.
607 */
608 void
609 _mesa_one_time_init_extension_overrides(void)
610 {
611 const char *env_const = getenv("MESA_EXTENSION_OVERRIDE");
612 char *env;
613 char *ext;
614 int len;
615 size_t offset;
616
617 atexit(free_unknown_extensions_strings);
618
619 memset(&_mesa_extension_override_enables, 0, sizeof(struct gl_extensions));
620 memset(&_mesa_extension_override_disables, 0, sizeof(struct gl_extensions));
621
622 if (env_const == NULL) {
623 return;
624 }
625
626 /* extra_exts: List of unrecognized extensions. */
627 extra_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
628 cant_disable_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
629
630 /* Copy env_const because strtok() is destructive. */
631 env = strdup(env_const);
632
633 if (env == NULL || extra_extensions == NULL ||
634 cant_disable_extensions == NULL) {
635 free(env);
636 free(extra_extensions);
637 free(cant_disable_extensions);
638 return;
639 }
640
641 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
642 int enable;
643 bool recognized;
644 switch (ext[0]) {
645 case '+':
646 enable = 1;
647 ++ext;
648 break;
649 case '-':
650 enable = 0;
651 ++ext;
652 break;
653 default:
654 enable = 1;
655 break;
656 }
657
658 offset = set_extension(&_mesa_extension_override_enables, ext, enable);
659 if (offset != 0 && (offset != o(dummy_true) || enable != GL_FALSE)) {
660 ((GLboolean *) &_mesa_extension_override_disables)[offset] = !enable;
661 recognized = true;
662 } else {
663 recognized = false;
664 }
665
666 if (!recognized) {
667 if (enable) {
668 strcat(extra_extensions, ext);
669 strcat(extra_extensions, " ");
670 } else if (offset == o(dummy_true)) {
671 strcat(cant_disable_extensions, ext);
672 strcat(cant_disable_extensions, " ");
673 }
674 }
675 }
676
677 free(env);
678
679 /* Remove trailing space, and free if unused. */
680 len = strlen(extra_extensions);
681 if (len == 0) {
682 free(extra_extensions);
683 extra_extensions = NULL;
684 } else if (extra_extensions[len - 1] == ' ') {
685 extra_extensions[len - 1] = '\0';
686 }
687 len = strlen(cant_disable_extensions);
688 if (len == 0) {
689 free(cant_disable_extensions);
690 cant_disable_extensions = NULL;
691 } else if (cant_disable_extensions[len - 1] == ' ') {
692 cant_disable_extensions[len - 1] = '\0';
693 }
694 }
695
696
697 /**
698 * \brief Initialize extension tables and enable default extensions.
699 *
700 * This should be called during context initialization.
701 * Note: Sets gl_extensions.dummy_true to true.
702 */
703 void
704 _mesa_init_extensions(struct gl_extensions *extensions)
705 {
706 GLboolean *base = (GLboolean *) extensions;
707 GLboolean *sentinel = base + o(extension_sentinel);
708 GLboolean *i;
709
710 /* First, turn all extensions off. */
711 for (i = base; i != sentinel; ++i)
712 *i = GL_FALSE;
713
714 /* Then, selectively turn default extensions on. */
715 extensions->dummy_true = GL_TRUE;
716 extensions->EXT_texture3D = GL_TRUE;
717 }
718
719
720 typedef unsigned short extension_index;
721
722
723 /**
724 * Compare two entries of the extensions table. Sorts first by year,
725 * then by name.
726 *
727 * Arguments are indices into extension_table.
728 */
729 static int
730 extension_compare(const void *p1, const void *p2)
731 {
732 extension_index i1 = * (const extension_index *) p1;
733 extension_index i2 = * (const extension_index *) p2;
734 const struct extension *e1 = &extension_table[i1];
735 const struct extension *e2 = &extension_table[i2];
736 int res;
737
738 res = (int)e1->year - (int)e2->year;
739
740 if (res == 0) {
741 res = strcmp(e1->name, e2->name);
742 }
743
744 return res;
745 }
746
747
748 /**
749 * Construct the GL_EXTENSIONS string. Called the first time that
750 * glGetString(GL_EXTENSIONS) is called.
751 */
752 GLubyte*
753 _mesa_make_extension_string(struct gl_context *ctx)
754 {
755 /* The extension string. */
756 char *exts = 0;
757 /* Length of extension string. */
758 size_t length = 0;
759 /* Number of extensions */
760 unsigned count;
761 /* Indices of the extensions sorted by year */
762 extension_index *extension_indices;
763 /* String of extra extensions. */
764 char *extra_extensions = get_extension_override(ctx);
765 GLboolean *base = (GLboolean *) &ctx->Extensions;
766 const struct extension *i;
767 unsigned j;
768 unsigned maxYear = ~0;
769 unsigned api_set = (1 << ctx->API);
770 if (_mesa_is_gles3(ctx))
771 api_set |= ES3;
772
773 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
774 {
775 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
776 if (env) {
777 maxYear = atoi(env);
778 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
779 maxYear);
780 }
781 }
782
783 /* Compute length of the extension string. */
784 count = 0;
785 for (i = extension_table; i->name != 0; ++i) {
786 if (base[i->offset] &&
787 i->year <= maxYear &&
788 (i->api_set & api_set)) {
789 length += strlen(i->name) + 1; /* +1 for space */
790 ++count;
791 }
792 }
793 if (extra_extensions != NULL)
794 length += 1 + strlen(extra_extensions); /* +1 for space */
795
796 exts = calloc(ALIGN(length + 1, 4), sizeof(char));
797 if (exts == NULL) {
798 free(extra_extensions);
799 return NULL;
800 }
801
802 extension_indices = malloc(count * sizeof(extension_index));
803 if (extension_indices == NULL) {
804 free(exts);
805 free(extra_extensions);
806 return NULL;
807 }
808
809 /* Sort extensions in chronological order because certain old applications
810 * (e.g., Quake3 demo) store the extension list in a static size buffer so
811 * chronologically order ensure that the extensions that such applications
812 * expect will fit into that buffer.
813 */
814 j = 0;
815 for (i = extension_table; i->name != 0; ++i) {
816 if (base[i->offset] &&
817 i->year <= maxYear &&
818 (i->api_set & api_set)) {
819 extension_indices[j++] = i - extension_table;
820 }
821 }
822 assert(j == count);
823 qsort(extension_indices, count,
824 sizeof *extension_indices, extension_compare);
825
826 /* Build the extension string.*/
827 for (j = 0; j < count; ++j) {
828 i = &extension_table[extension_indices[j]];
829 assert(base[i->offset] && (i->api_set & api_set));
830 strcat(exts, i->name);
831 strcat(exts, " ");
832 }
833 free(extension_indices);
834 if (extra_extensions != 0) {
835 strcat(exts, extra_extensions);
836 free(extra_extensions);
837 }
838
839 return (GLubyte *) exts;
840 }
841
842 /**
843 * Return number of enabled extensions.
844 */
845 GLuint
846 _mesa_get_extension_count(struct gl_context *ctx)
847 {
848 GLboolean *base;
849 const struct extension *i;
850 unsigned api_set = (1 << ctx->API);
851 if (_mesa_is_gles3(ctx))
852 api_set |= ES3;
853
854 /* only count once */
855 if (ctx->Extensions.Count != 0)
856 return ctx->Extensions.Count;
857
858 base = (GLboolean *) &ctx->Extensions;
859 for (i = extension_table; i->name != 0; ++i) {
860 if (base[i->offset] && (i->api_set & api_set)) {
861 ctx->Extensions.Count++;
862 }
863 }
864 return ctx->Extensions.Count;
865 }
866
867 /**
868 * Return name of i-th enabled extension
869 */
870 const GLubyte *
871 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
872 {
873 const GLboolean *base;
874 size_t n;
875 const struct extension *i;
876 unsigned api_set = (1 << ctx->API);
877 if (_mesa_is_gles3(ctx))
878 api_set |= ES3;
879
880 base = (GLboolean*) &ctx->Extensions;
881 n = 0;
882 for (i = extension_table; i->name != 0; ++i) {
883 if (base[i->offset] && (i->api_set & api_set)) {
884 if (n == index)
885 return (const GLubyte*) i->name;
886 else
887 ++n;
888 }
889 }
890
891 return NULL;
892 }