projects / mesa.git / blob
? search:


4a3c231e36f317d90f549ed1b8c690b453413cae
[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 ES31 = 1 << (API_OPENGL_LAST + 2),
54 };
55
56 /**
57 * \brief An element of the \c extension_table.
58 */
59 struct extension {
60 /** Name of extension, such as "GL_ARB_depth_clamp". */
61 const char *name;
62
63 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
64 size_t offset;
65
66 /** Set of API's in which the extension exists, as a bitset. */
67 uint8_t api_set;
68
69 /** Year the extension was proposed or approved. Used to sort the
70 * extension string chronologically. */
71 uint16_t year;
72 };
73
74
75 /**
76 * Given a member \c x of struct gl_extensions, return offset of
77 * \c x in bytes.
78 */
79 #define o(x) offsetof(struct gl_extensions, x)
80
81
82 /**
83 * \brief Table of supported OpenGL extensions for all API's.
84 */
85 static const struct extension extension_table[] = {
86 /* ARB Extensions */
87 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 },
88 { "GL_ARB_ES3_compatibility", o(ARB_ES3_compatibility), GL, 2012 },
89 { "GL_ARB_arrays_of_arrays", o(ARB_arrays_of_arrays), GL, 2012 },
90 { "GL_ARB_base_instance", o(ARB_base_instance), GL, 2011 },
91 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 },
92 { "GL_ARB_buffer_storage", o(ARB_buffer_storage), GL, 2013 },
93 { "GL_ARB_clear_buffer_object", o(dummy_true), GL, 2012 },
94 { "GL_ARB_clear_texture", o(ARB_clear_texture), GL, 2013 },
95 { "GL_ARB_clip_control", o(ARB_clip_control), GL, 2014 },
96 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
97 { "GL_ARB_compressed_texture_pixel_storage", o(dummy_true), GL, 2011 },
98 { "GL_ARB_compute_shader", o(ARB_compute_shader), GL, 2012 },
99 { "GL_ARB_conditional_render_inverted", o(ARB_conditional_render_inverted), GL, 2014 },
100 { "GL_ARB_copy_buffer", o(dummy_true), GL, 2008 },
101 { "GL_ARB_copy_image", o(ARB_copy_image), GL, 2012 },
102 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
103 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 },
104 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
105 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
106 { "GL_ARB_depth_texture", o(ARB_depth_texture), GLL, 2001 },
107 { "GL_ARB_derivative_control", o(ARB_derivative_control), GL, 2014 },
108 { "GL_ARB_direct_state_access", o(dummy_true), GLC, 2014 },
109 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 },
110 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
111 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
112 { "GL_ARB_draw_indirect", o(ARB_draw_indirect), GLC, 2010 },
113 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
114 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
115 { "GL_ARB_explicit_uniform_location", o(ARB_explicit_uniform_location), GL, 2012 },
116 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
117 { "GL_ARB_fragment_layer_viewport", o(ARB_fragment_layer_viewport), GLC, 2012 },
118 { "GL_ARB_fragment_program", o(ARB_fragment_program), GLL, 2002 },
119 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GLL, 2003 },
120 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
121 { "GL_ARB_framebuffer_no_attachments", o(ARB_framebuffer_no_attachments), GL, 2012 },
122 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
123 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
124 { "GL_ARB_get_program_binary", o(dummy_true), GL, 2010 },
125 { "GL_ARB_get_texture_sub_image", o(dummy_true), GL, 2014 },
126 { "GL_ARB_gpu_shader5", o(ARB_gpu_shader5), GLC, 2010 },
127 { "GL_ARB_gpu_shader_fp64", o(ARB_gpu_shader_fp64), GLC, 2010 },
128 { "GL_ARB_half_float_pixel", o(dummy_true), GL, 2003 },
129 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
130 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
131 { "GL_ARB_internalformat_query", o(ARB_internalformat_query), GL, 2011 },
132 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 },
133 { "GL_ARB_map_buffer_alignment", o(dummy_true), GL, 2011 },
134 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
135 { "GL_ARB_multi_bind", o(dummy_true), GL, 2013 },
136 { "GL_ARB_multi_draw_indirect", o(ARB_draw_indirect), GLC, 2012 },
137 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 },
138 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 },
139 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
140 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 },
141 { "GL_ARB_pipeline_statistics_query", o(ARB_pipeline_statistics_query), GL, 2014 },
142 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
143 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 },
144 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
145 { "GL_ARB_program_interface_query", o(dummy_true), GL, 2012 },
146 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
147 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
148 { "GL_ARB_sample_shading", o(ARB_sample_shading), GL, 2009 },
149 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 },
150 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
151 { "GL_ARB_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2013 },
152 { "GL_ARB_separate_shader_objects", o(dummy_true), GL, 2010 },
153 { "GL_ARB_shader_atomic_counters", o(ARB_shader_atomic_counters), GL, 2011 },
154 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
155 { "GL_ARB_shader_image_load_store", o(ARB_shader_image_load_store), GL, 2011 },
156 { "GL_ARB_shader_image_size", o(ARB_shader_image_size), GL, 2012 },
157 { "GL_ARB_shader_objects", o(dummy_true), GL, 2002 },
158 { "GL_ARB_shader_precision", o(ARB_shader_precision), GL, 2010 },
159 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
160 { "GL_ARB_shader_storage_buffer_object", o(ARB_shader_storage_buffer_object), GL, 2012 },
161 { "GL_ARB_shader_subroutine", o(ARB_shader_subroutine), GLC, 2010 },
162 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
163 { "GL_ARB_shading_language_100", o(dummy_true), GLL, 2003 },
164 { "GL_ARB_shading_language_packing", o(ARB_shading_language_packing), GL, 2011 },
165 { "GL_ARB_shading_language_420pack", o(ARB_shading_language_420pack), GL, 2011 },
166 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
167 { "GL_ARB_stencil_texturing", o(ARB_stencil_texturing), GL, 2012 },
168 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
169 { "GL_ARB_texture_barrier", o(NV_texture_barrier), GL, 2014 },
170 { "GL_ARB_tessellation_shader", o(ARB_tessellation_shader), GLC, 2009 },
171 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
172 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GLC, 2008 },
173 { "GL_ARB_texture_buffer_object_rgb32", o(ARB_texture_buffer_object_rgb32), GLC, 2009 },
174 { "GL_ARB_texture_buffer_range", o(ARB_texture_buffer_range), GLC, 2012 },
175 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 },
176 { "GL_ARB_texture_compression_bptc", o(ARB_texture_compression_bptc), GL, 2010 },
177 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
178 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 },
179 { "GL_ARB_texture_cube_map_array", o(ARB_texture_cube_map_array), GL, 2009 },
180 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 },
181 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 },
182 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 },
183 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 },
184 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
185 { "GL_ARB_texture_gather", o(ARB_texture_gather), GL, 2009 },
186 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 },
187 { "GL_ARB_texture_mirror_clamp_to_edge", o(ARB_texture_mirror_clamp_to_edge), GL, 2013 },
188 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
189 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
190 { "GL_ARB_texture_query_levels", o(ARB_texture_query_levels), GL, 2012 },
191 { "GL_ARB_texture_query_lod", o(ARB_texture_query_lod), GL, 2009 },
192 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
193 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
194 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
195 { "GL_ARB_texture_stencil8", o(ARB_texture_stencil8), GL, 2013 },
196 { "GL_ARB_texture_storage", o(dummy_true), GL, 2011 },
197 { "GL_ARB_texture_storage_multisample", o(ARB_texture_multisample), GL, 2012 },
198 { "GL_ARB_texture_view", o(ARB_texture_view), GL, 2012 },
199 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
200 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
201 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
202 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
203 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
204 { "GL_ARB_transpose_matrix", o(dummy_true), GLL, 1999 },
205 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
206 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
207 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 },
208 { "GL_ARB_vertex_attrib_binding", o(dummy_true), GL, 2012 },
209 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 },
210 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 },
211 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
212 { "GL_ARB_vertex_attrib_64bit", o(ARB_vertex_attrib_64bit), GLC, 2010 },
213 { "GL_ARB_vertex_type_10f_11f_11f_rev", o(ARB_vertex_type_10f_11f_11f_rev), GL, 2013 },
214 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
215 { "GL_ARB_viewport_array", o(ARB_viewport_array), GLC, 2010 },
216 { "GL_ARB_window_pos", o(dummy_true), GLL, 2001 },
217 /* EXT extensions */
218 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
219 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 },
220 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 },
221 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
222 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
223 { "GL_EXT_discard_framebuffer", o(dummy_true), ES1 | ES2, 2009 },
224 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 },
225 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 },
226 { "GL_EXT_compiled_vertex_array", o(dummy_true), GLL, 1996 },
227 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 },
228 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
229 { "GL_EXT_draw_buffers", o(dummy_true), ES2, 2012 },
230 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
231 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
232 { "GL_EXT_draw_range_elements", o(dummy_true), GLL, 1997 },
233 { "GL_EXT_fog_coord", o(dummy_true), GLL, 1999 },
234 { "GL_EXT_framebuffer_blit", o(dummy_true), GL, 2005 },
235 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
236 { "GL_EXT_framebuffer_multisample_blit_scaled", o(EXT_framebuffer_multisample_blit_scaled), GL, 2011 },
237 { "GL_EXT_framebuffer_object", o(dummy_true), GLL, 2000 },
238 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
239 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 },
240 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
241 { "GL_EXT_map_buffer_range", o(ARB_map_buffer_range), ES1 | ES2, 2012 },
242 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 },
243 { "GL_EXT_packed_depth_stencil", o(dummy_true), GL, 2005 },
244 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
245 { "GL_EXT_packed_pixels", o(dummy_true), GLL, 1997 },
246 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
247 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 },
248 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 },
249 { "GL_EXT_polygon_offset_clamp", o(EXT_polygon_offset_clamp), GL, 2014 },
250 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
251 { "GL_EXT_rescale_normal", o(dummy_true), GLL, 1997 },
252 { "GL_EXT_secondary_color", o(dummy_true), GLL, 1999 },
253 { "GL_EXT_separate_shader_objects", o(dummy_true), ES2, 2013 },
254 { "GL_EXT_separate_specular_color", o(dummy_true), GLL, 1997 },
255 { "GL_EXT_shader_integer_mix", o(EXT_shader_integer_mix), GL | ES3, 2013 },
256 { "GL_EXT_shadow_funcs", o(ARB_shadow), GLL, 2002 },
257 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 },
258 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 },
259 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 },
260 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 },
261 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
262 { "GL_EXT_texture_compression_dxt1", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2004 },
263 { "GL_ANGLE_texture_compression_dxt3", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
264 { "GL_ANGLE_texture_compression_dxt5", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
265 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
266 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
267 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
268 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 },
269 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 },
270 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 },
271 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 },
272 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 },
273 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
274 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
275 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
276 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
277 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
278 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 },
279 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
280 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 },
281 { "GL_EXT_texture", o(dummy_true), GLL, 1996 },
282 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 },
283 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
284 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
285 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
286 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
287 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
288 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
289 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
290 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
291 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
292 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
293 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 },
294 { "GL_EXT_color_buffer_float", o(dummy_true), ES3, 2013 },
295
296 /* OES extensions */
297 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
298 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
299 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
300 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
301 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
302 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
303 { "GL_OES_depth24", o(dummy_true), ES1 | ES2, 2005 },
304 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
305 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
306 { "GL_OES_depth_texture_cube_map", o(OES_depth_texture_cube_map), ES2, 2012 },
307 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
308 { "GL_OES_EGL_sync", o(dummy_true), ES1 | ES2, 2010 },
309 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
310 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
311 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
312 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
313 { "GL_OES_fbo_render_mipmap", o(dummy_true), ES1 | ES2, 2005 },
314 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
315 { "GL_OES_framebuffer_object", o(dummy_true), ES1, 2005 },
316 { "GL_OES_get_program_binary", o(dummy_true), ES2, 2008 },
317 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
318 { "GL_OES_packed_depth_stencil", o(dummy_true), ES1 | ES2, 2007 },
319 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
320 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
321 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
322 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
323 { "GL_OES_rgb8_rgba8", o(dummy_true), ES1 | ES2, 2005 },
324 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
325 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
326 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
327 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
328 { "GL_OES_stencil8", o(dummy_true), ES1 | ES2, 2005 },
329 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
330 { "GL_OES_surfaceless_context", o(dummy_true), ES1 | ES2, 2012 },
331 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
332 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
333 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
334 { "GL_OES_texture_float", o(OES_texture_float), ES2, 2005 },
335 { "GL_OES_texture_float_linear", o(OES_texture_float_linear), ES2, 2005 },
336 { "GL_OES_texture_half_float", o(OES_texture_half_float), ES2, 2005 },
337 { "GL_OES_texture_half_float_linear", o(OES_texture_half_float_linear), ES2, 2005 },
338 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
339 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES1 | ES2, 2005 },
340 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 },
341
342 /* KHR extensions */
343 { "GL_KHR_debug", o(dummy_true), GL, 2012 },
344 { "GL_KHR_context_flush_control", o(dummy_true), GL | ES2, 2014 },
345
346 /* Vendor extensions */
347 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
348 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
349 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
350 { "GL_AMD_performance_monitor", o(AMD_performance_monitor), GL, 2007 },
351 { "GL_AMD_pinned_memory", o(AMD_pinned_memory), GL, 2013 },
352 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
353 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
354 { "GL_AMD_shader_trinary_minmax", o(dummy_true), GL, 2012 },
355 { "GL_AMD_vertex_shader_layer", o(AMD_vertex_shader_layer), GLC, 2012 },
356 { "GL_AMD_vertex_shader_viewport_index", o(AMD_vertex_shader_viewport_index), GLC, 2012 },
357 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
358 { "GL_APPLE_packed_pixels", o(dummy_true), GLL, 2002 },
359 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 },
360 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 },
361 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
362 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 },
363 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 },
364 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 },
365 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
366 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 },
367 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
368 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
369 { "GL_IBM_multimode_draw_arrays", o(dummy_true), GL, 1998 },
370 { "GL_IBM_rasterpos_clip", o(dummy_true), GLL, 1996 },
371 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 },
372 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
373 { "GL_INTEL_performance_query", o(INTEL_performance_query), GL | ES2, 2013 },
374 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
375 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
376 { "GL_MESA_window_pos", o(dummy_true), GLL, 2000 },
377 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
378 { "GL_NV_blend_square", o(dummy_true), GLL, 1999 },
379 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
380 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
381 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
382 { "GL_NV_fbo_color_attachments", o(dummy_true), ES2, 2010 },
383 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 },
384 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 },
385 { "GL_NV_light_max_exponent", o(dummy_true), GLL, 1999 },
386 { "GL_NV_packed_depth_stencil", o(dummy_true), GL, 2000 },
387 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
388 { "GL_NV_primitive_restart", o(NV_primitive_restart), GLL, 2002 },
389 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
390 { "GL_NV_read_depth", o(dummy_true), ES2, 2011 },
391 { "GL_NV_read_depth_stencil", o(dummy_true), ES2, 2011 },
392 { "GL_NV_read_stencil", o(dummy_true), ES2, 2011 },
393 { "GL_NV_texgen_reflection", o(dummy_true), GLL, 1999 },
394 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
395 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 },
396 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 },
397 { "GL_NV_vdpau_interop", o(NV_vdpau_interop), GL, 2010 },
398 { "GL_S3_s3tc", o(ANGLE_texture_compression_dxt), GL, 1999 },
399 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 },
400 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 },
401 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 },
402 { "GL_SGIS_texture_lod", o(dummy_true), GLL, 1997 },
403 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 },
404
405 { 0, 0, 0, 0 },
406 };
407
408
409 /**
410 * Given an extension name, lookup up the corresponding member of struct
411 * gl_extensions and return that member's offset (in bytes). If the name is
412 * not found in the \c extension_table, return 0.
413 *
414 * \param name Name of extension.
415 * \return Offset of member in struct gl_extensions.
416 */
417 static size_t
418 name_to_offset(const char* name)
419 {
420 const struct extension *i;
421
422 if (name == 0)
423 return 0;
424
425 for (i = extension_table; i->name != 0; ++i) {
426 if (strcmp(name, i->name) == 0)
427 return i->offset;
428 }
429
430 return 0;
431 }
432
433 /**
434 * Overrides extensions in \c ctx based on the values in
435 * _mesa_extension_override_enables and _mesa_extension_override_disables.
436 */
437 static void
438 override_extensions_in_context(struct gl_context *ctx)
439 {
440 const struct extension *i;
441 const GLboolean *enables =
442 (GLboolean*) &_mesa_extension_override_enables;
443 const GLboolean *disables =
444 (GLboolean*) &_mesa_extension_override_disables;
445 GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions;
446
447 for (i = extension_table; i->name != 0; ++i) {
448 size_t offset = i->offset;
449 assert(!enables[offset] || !disables[offset]);
450 if (enables[offset]) {
451 ctx_ext[offset] = 1;
452 } else if (disables[offset]) {
453 ctx_ext[offset] = 0;
454 }
455 }
456 }
457
458
459 /**
460 * Enable all extensions suitable for a software-only renderer.
461 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
462 */
463 void
464 _mesa_enable_sw_extensions(struct gl_context *ctx)
465 {
466 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
467 ctx->Extensions.ARB_depth_texture = GL_TRUE;
468 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
469 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
470 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
471 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
472 ctx->Extensions.ARB_fragment_program = GL_TRUE;
473 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
474 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
475 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
476 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
477 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
478 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
479 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
480 ctx->Extensions.ARB_point_sprite = GL_TRUE;
481 ctx->Extensions.ARB_shadow = GL_TRUE;
482 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
483 ctx->Extensions.ARB_texture_compression_bptc = GL_TRUE;
484 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
485 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
486 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
487 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
488 #ifdef TEXTURE_FLOAT_ENABLED
489 ctx->Extensions.ARB_texture_float = GL_TRUE;
490 #endif
491 ctx->Extensions.ARB_texture_mirror_clamp_to_edge = GL_TRUE;
492 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
493 ctx->Extensions.ARB_texture_rg = GL_TRUE;
494 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
495 ctx->Extensions.ARB_vertex_program = GL_TRUE;
496 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
497 ctx->Extensions.ARB_sync = GL_TRUE;
498 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
499 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
500 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
501 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
502 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
503 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
504 ctx->Extensions.EXT_blend_color = GL_TRUE;
505 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
506 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
507 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
508 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
509 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
510 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
511 ctx->Extensions.EXT_point_parameters = GL_TRUE;
512 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
513 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
514 ctx->Extensions.EXT_texture_array = GL_TRUE;
515 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
516 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
517 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
518 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
519 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
520 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
521 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
522 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
523 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
524 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
525 ctx->Extensions.MESA_pack_invert = GL_TRUE;
526 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
527 ctx->Extensions.NV_conditional_render = GL_TRUE;
528 ctx->Extensions.NV_point_sprite = GL_TRUE;
529 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
530 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
531 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
532 ctx->Extensions.OES_standard_derivatives = GL_TRUE;
533 ctx->Extensions.TDFX_texture_compression_FXT1 = GL_TRUE;
534 if (ctx->Mesa_DXTn) {
535 ctx->Extensions.ANGLE_texture_compression_dxt = GL_TRUE;
536 ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
537 }
538 }
539
540 /**
541 * Either enable or disable the named extension.
542 * \return offset of extensions withint `ext' or 0 if extension is not known
543 */
544 static size_t
545 set_extension(struct gl_extensions *ext, const char *name, GLboolean state)
546 {
547 size_t offset;
548
549 offset = name_to_offset(name);
550 if (offset != 0 && (offset != o(dummy_true) || state != GL_FALSE)) {
551 ((GLboolean *) ext)[offset] = state;
552 }
553
554 return offset;
555 }
556
557 /**
558 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
559 *
560 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
561 * enable or disable. The list is processed thus:
562 * - Enable recognized extension names that are prefixed with '+'.
563 * - Disable recognized extension names that are prefixed with '-'.
564 * - Enable recognized extension names that are not prefixed.
565 * - Collect unrecognized extension names in a new string.
566 *
567 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
568 * _mesa_one_time_init_extension_overrides. We just use the results of that
569 * parsing in this function.
570 *
571 * \return Space-separated list of unrecognized extension names (which must
572 * be freed). Does not return \c NULL.
573 */
574 static char *
575 get_extension_override( struct gl_context *ctx )
576 {
577 override_extensions_in_context(ctx);
578
579 if (cant_disable_extensions != NULL) {
580 _mesa_problem(ctx,
581 "Trying to disable permanently enabled extensions: %s",
582 cant_disable_extensions);
583 }
584
585 if (extra_extensions == NULL) {
586 return calloc(1, sizeof(char));
587 } else {
588 _mesa_problem(ctx, "Trying to enable unknown extensions: %s",
589 extra_extensions);
590 return strdup(extra_extensions);
591 }
592 }
593
594
595 /**
596 * \brief Free extra_extensions and cant_disable_extensions strings
597 *
598 * These strings are allocated early during the first context creation by
599 * _mesa_one_time_init_extension_overrides.
600 */
601 static void
602 free_unknown_extensions_strings(void)
603 {
604 free(extra_extensions);
605 free(cant_disable_extensions);
606 }
607
608
609 /**
610 * \brief Initialize extension override tables.
611 *
612 * This should be called one time early during first context initialization.
613 */
614 void
615 _mesa_one_time_init_extension_overrides(void)
616 {
617 const char *env_const = getenv("MESA_EXTENSION_OVERRIDE");
618 char *env;
619 char *ext;
620 int len;
621 size_t offset;
622
623 atexit(free_unknown_extensions_strings);
624
625 memset(&_mesa_extension_override_enables, 0, sizeof(struct gl_extensions));
626 memset(&_mesa_extension_override_disables, 0, sizeof(struct gl_extensions));
627
628 if (env_const == NULL) {
629 return;
630 }
631
632 /* extra_exts: List of unrecognized extensions. */
633 extra_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
634 cant_disable_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
635
636 /* Copy env_const because strtok() is destructive. */
637 env = strdup(env_const);
638
639 if (env == NULL || extra_extensions == NULL ||
640 cant_disable_extensions == NULL) {
641 free(env);
642 free(extra_extensions);
643 free(cant_disable_extensions);
644 return;
645 }
646
647 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
648 int enable;
649 bool recognized;
650 switch (ext[0]) {
651 case '+':
652 enable = 1;
653 ++ext;
654 break;
655 case '-':
656 enable = 0;
657 ++ext;
658 break;
659 default:
660 enable = 1;
661 break;
662 }
663
664 offset = set_extension(&_mesa_extension_override_enables, ext, enable);
665 if (offset != 0 && (offset != o(dummy_true) || enable != GL_FALSE)) {
666 ((GLboolean *) &_mesa_extension_override_disables)[offset] = !enable;
667 recognized = true;
668 } else {
669 recognized = false;
670 }
671
672 if (!recognized) {
673 if (enable) {
674 strcat(extra_extensions, ext);
675 strcat(extra_extensions, " ");
676 } else if (offset == o(dummy_true)) {
677 strcat(cant_disable_extensions, ext);
678 strcat(cant_disable_extensions, " ");
679 }
680 }
681 }
682
683 free(env);
684
685 /* Remove trailing space, and free if unused. */
686 len = strlen(extra_extensions);
687 if (len == 0) {
688 free(extra_extensions);
689 extra_extensions = NULL;
690 } else if (extra_extensions[len - 1] == ' ') {
691 extra_extensions[len - 1] = '\0';
692 }
693 len = strlen(cant_disable_extensions);
694 if (len == 0) {
695 free(cant_disable_extensions);
696 cant_disable_extensions = NULL;
697 } else if (cant_disable_extensions[len - 1] == ' ') {
698 cant_disable_extensions[len - 1] = '\0';
699 }
700 }
701
702
703 /**
704 * \brief Initialize extension tables and enable default extensions.
705 *
706 * This should be called during context initialization.
707 * Note: Sets gl_extensions.dummy_true to true.
708 */
709 void
710 _mesa_init_extensions(struct gl_extensions *extensions)
711 {
712 GLboolean *base = (GLboolean *) extensions;
713 GLboolean *sentinel = base + o(extension_sentinel);
714 GLboolean *i;
715
716 /* First, turn all extensions off. */
717 for (i = base; i != sentinel; ++i)
718 *i = GL_FALSE;
719
720 /* Then, selectively turn default extensions on. */
721 extensions->dummy_true = GL_TRUE;
722 extensions->EXT_texture3D = GL_TRUE;
723 }
724
725
726 typedef unsigned short extension_index;
727
728
729 /**
730 * Compare two entries of the extensions table. Sorts first by year,
731 * then by name.
732 *
733 * Arguments are indices into extension_table.
734 */
735 static int
736 extension_compare(const void *p1, const void *p2)
737 {
738 extension_index i1 = * (const extension_index *) p1;
739 extension_index i2 = * (const extension_index *) p2;
740 const struct extension *e1 = &extension_table[i1];
741 const struct extension *e2 = &extension_table[i2];
742 int res;
743
744 res = (int)e1->year - (int)e2->year;
745
746 if (res == 0) {
747 res = strcmp(e1->name, e2->name);
748 }
749
750 return res;
751 }
752
753
754 /**
755 * Construct the GL_EXTENSIONS string. Called the first time that
756 * glGetString(GL_EXTENSIONS) is called.
757 */
758 GLubyte*
759 _mesa_make_extension_string(struct gl_context *ctx)
760 {
761 /* The extension string. */
762 char *exts = 0;
763 /* Length of extension string. */
764 size_t length = 0;
765 /* Number of extensions */
766 unsigned count;
767 /* Indices of the extensions sorted by year */
768 extension_index *extension_indices;
769 /* String of extra extensions. */
770 char *extra_extensions = get_extension_override(ctx);
771 GLboolean *base = (GLboolean *) &ctx->Extensions;
772 const struct extension *i;
773 unsigned j;
774 unsigned maxYear = ~0;
775 unsigned api_set = (1 << ctx->API);
776 if (_mesa_is_gles3(ctx))
777 api_set |= ES3;
778 if (_mesa_is_gles31(ctx))
779 api_set |= ES31;
780
781 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
782 {
783 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
784 if (env) {
785 maxYear = atoi(env);
786 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
787 maxYear);
788 }
789 }
790
791 /* Compute length of the extension string. */
792 count = 0;
793 for (i = extension_table; i->name != 0; ++i) {
794 if (base[i->offset] &&
795 i->year <= maxYear &&
796 (i->api_set & api_set)) {
797 length += strlen(i->name) + 1; /* +1 for space */
798 ++count;
799 }
800 }
801 if (extra_extensions != NULL)
802 length += 1 + strlen(extra_extensions); /* +1 for space */
803
804 exts = calloc(ALIGN(length + 1, 4), sizeof(char));
805 if (exts == NULL) {
806 free(extra_extensions);
807 return NULL;
808 }
809
810 extension_indices = malloc(count * sizeof(extension_index));
811 if (extension_indices == NULL) {
812 free(exts);
813 free(extra_extensions);
814 return NULL;
815 }
816
817 /* Sort extensions in chronological order because certain old applications
818 * (e.g., Quake3 demo) store the extension list in a static size buffer so
819 * chronologically order ensure that the extensions that such applications
820 * expect will fit into that buffer.
821 */
822 j = 0;
823 for (i = extension_table; i->name != 0; ++i) {
824 if (base[i->offset] &&
825 i->year <= maxYear &&
826 (i->api_set & api_set)) {
827 extension_indices[j++] = i - extension_table;
828 }
829 }
830 assert(j == count);
831 qsort(extension_indices, count,
832 sizeof *extension_indices, extension_compare);
833
834 /* Build the extension string.*/
835 for (j = 0; j < count; ++j) {
836 i = &extension_table[extension_indices[j]];
837 assert(base[i->offset] && (i->api_set & api_set));
838 strcat(exts, i->name);
839 strcat(exts, " ");
840 }
841 free(extension_indices);
842 if (extra_extensions != 0) {
843 strcat(exts, extra_extensions);
844 free(extra_extensions);
845 }
846
847 return (GLubyte *) exts;
848 }
849
850 /**
851 * Return number of enabled extensions.
852 */
853 GLuint
854 _mesa_get_extension_count(struct gl_context *ctx)
855 {
856 GLboolean *base;
857 const struct extension *i;
858 unsigned api_set = (1 << ctx->API);
859 if (_mesa_is_gles3(ctx))
860 api_set |= ES3;
861 if (_mesa_is_gles31(ctx))
862 api_set |= ES31;
863
864 /* only count once */
865 if (ctx->Extensions.Count != 0)
866 return ctx->Extensions.Count;
867
868 base = (GLboolean *) &ctx->Extensions;
869 for (i = extension_table; i->name != 0; ++i) {
870 if (base[i->offset] && (i->api_set & api_set)) {
871 ctx->Extensions.Count++;
872 }
873 }
874 return ctx->Extensions.Count;
875 }
876
877 /**
878 * Return name of i-th enabled extension
879 */
880 const GLubyte *
881 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
882 {
883 const GLboolean *base;
884 size_t n;
885 const struct extension *i;
886 unsigned api_set = (1 << ctx->API);
887 if (_mesa_is_gles3(ctx))
888 api_set |= ES3;
889 if (_mesa_is_gles31(ctx))
890 api_set |= ES31;
891
892 base = (GLboolean*) &ctx->Extensions;
893 n = 0;
894 for (i = extension_table; i->name != 0; ++i) {
895 if (base[i->offset] && (i->api_set & api_set)) {
896 if (n == index)
897 return (const GLubyte*) i->name;
898 else
899 ++n;
900 }
901 }
902
903 return NULL;
904 }