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Merge branch 'wip/nir-vtn' into vulkan
[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_gpu_shader5", o(ARB_gpu_shader5), GLC, 2010 },
125 { "GL_ARB_gpu_shader_fp64", o(ARB_gpu_shader_fp64), GLC, 2010 },
126 { "GL_ARB_half_float_pixel", o(dummy_true), GL, 2003 },
127 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
128 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
129 { "GL_ARB_internalformat_query", o(ARB_internalformat_query), GL, 2011 },
130 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 },
131 { "GL_ARB_map_buffer_alignment", o(dummy_true), GL, 2011 },
132 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
133 { "GL_ARB_multi_bind", o(dummy_true), GL, 2013 },
134 { "GL_ARB_multi_draw_indirect", o(ARB_draw_indirect), GLC, 2012 },
135 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 },
136 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 },
137 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
138 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 },
139 { "GL_ARB_pipeline_statistics_query", o(ARB_pipeline_statistics_query), GL, 2014 },
140 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
141 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 },
142 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
143 { "GL_ARB_program_interface_query", o(dummy_true), GL, 2012 },
144 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
145 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
146 { "GL_ARB_sample_shading", o(ARB_sample_shading), GL, 2009 },
147 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 },
148 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
149 { "GL_ARB_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2013 },
150 { "GL_ARB_separate_shader_objects", o(dummy_true), GL, 2010 },
151 { "GL_ARB_shader_atomic_counters", o(ARB_shader_atomic_counters), GL, 2011 },
152 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
153 { "GL_ARB_shader_image_load_store", o(ARB_shader_image_load_store), GL, 2011 },
154 { "GL_ARB_shader_objects", o(dummy_true), GL, 2002 },
155 { "GL_ARB_shader_precision", o(ARB_shader_precision), GL, 2010 },
156 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
157 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
158 { "GL_ARB_shading_language_100", o(dummy_true), GLL, 2003 },
159 { "GL_ARB_shading_language_packing", o(ARB_shading_language_packing), GL, 2011 },
160 { "GL_ARB_shading_language_420pack", o(ARB_shading_language_420pack), GL, 2011 },
161 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
162 { "GL_ARB_stencil_texturing", o(ARB_stencil_texturing), GL, 2012 },
163 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
164 { "GL_ARB_texture_barrier", o(NV_texture_barrier), GL, 2014 },
165 { "GL_ARB_tessellation_shader", o(ARB_tessellation_shader), GLC, 2009 },
166 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
167 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GLC, 2008 },
168 { "GL_ARB_texture_buffer_object_rgb32", o(ARB_texture_buffer_object_rgb32), GLC, 2009 },
169 { "GL_ARB_texture_buffer_range", o(ARB_texture_buffer_range), GLC, 2012 },
170 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 },
171 { "GL_ARB_texture_compression_bptc", o(ARB_texture_compression_bptc), GL, 2010 },
172 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
173 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 },
174 { "GL_ARB_texture_cube_map_array", o(ARB_texture_cube_map_array), GL, 2009 },
175 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 },
176 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 },
177 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 },
178 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 },
179 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
180 { "GL_ARB_texture_gather", o(ARB_texture_gather), GL, 2009 },
181 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 },
182 { "GL_ARB_texture_mirror_clamp_to_edge", o(ARB_texture_mirror_clamp_to_edge), GL, 2013 },
183 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
184 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
185 { "GL_ARB_texture_query_levels", o(ARB_texture_query_levels), GL, 2012 },
186 { "GL_ARB_texture_query_lod", o(ARB_texture_query_lod), GL, 2009 },
187 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
188 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
189 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
190 { "GL_ARB_texture_stencil8", o(ARB_texture_stencil8), GL, 2013 },
191 { "GL_ARB_texture_storage", o(dummy_true), GL, 2011 },
192 { "GL_ARB_texture_storage_multisample", o(ARB_texture_multisample), GL, 2012 },
193 { "GL_ARB_texture_view", o(ARB_texture_view), GL, 2012 },
194 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
195 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
196 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
197 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
198 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
199 { "GL_ARB_transpose_matrix", o(dummy_true), GLL, 1999 },
200 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
201 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
202 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 },
203 { "GL_ARB_vertex_attrib_binding", o(dummy_true), GL, 2012 },
204 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 },
205 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 },
206 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
207 { "GL_ARB_vertex_attrib_64bit", o(ARB_vertex_attrib_64bit), GLC, 2010 },
208 { "GL_ARB_vertex_type_10f_11f_11f_rev", o(ARB_vertex_type_10f_11f_11f_rev), GL, 2013 },
209 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
210 { "GL_ARB_viewport_array", o(ARB_viewport_array), GLC, 2010 },
211 { "GL_ARB_window_pos", o(dummy_true), GLL, 2001 },
212 /* EXT extensions */
213 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
214 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 },
215 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 },
216 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
217 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
218 { "GL_EXT_discard_framebuffer", o(dummy_true), ES1 | ES2, 2009 },
219 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 },
220 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 },
221 { "GL_EXT_compiled_vertex_array", o(dummy_true), GLL, 1996 },
222 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 },
223 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
224 { "GL_EXT_draw_buffers", o(dummy_true), ES2, 2012 },
225 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
226 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
227 { "GL_EXT_draw_range_elements", o(dummy_true), GLL, 1997 },
228 { "GL_EXT_fog_coord", o(dummy_true), GLL, 1999 },
229 { "GL_EXT_framebuffer_blit", o(dummy_true), GL, 2005 },
230 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
231 { "GL_EXT_framebuffer_multisample_blit_scaled", o(EXT_framebuffer_multisample_blit_scaled), GL, 2011 },
232 { "GL_EXT_framebuffer_object", o(dummy_true), GLL, 2000 },
233 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
234 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 },
235 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
236 { "GL_EXT_map_buffer_range", o(ARB_map_buffer_range), ES1 | ES2, 2012 },
237 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 },
238 { "GL_EXT_packed_depth_stencil", o(dummy_true), GL, 2005 },
239 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
240 { "GL_EXT_packed_pixels", o(dummy_true), GLL, 1997 },
241 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
242 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 },
243 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 },
244 { "GL_EXT_polygon_offset_clamp", o(EXT_polygon_offset_clamp), GL, 2014 },
245 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
246 { "GL_EXT_rescale_normal", o(dummy_true), GLL, 1997 },
247 { "GL_EXT_secondary_color", o(dummy_true), GLL, 1999 },
248 { "GL_EXT_separate_shader_objects", o(dummy_true), ES2, 2013 },
249 { "GL_EXT_separate_specular_color", o(dummy_true), GLL, 1997 },
250 { "GL_EXT_shader_integer_mix", o(EXT_shader_integer_mix), GL | ES3, 2013 },
251 { "GL_EXT_shadow_funcs", o(ARB_shadow), GLL, 2002 },
252 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 },
253 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 },
254 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 },
255 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 },
256 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
257 { "GL_EXT_texture_compression_dxt1", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2004 },
258 { "GL_ANGLE_texture_compression_dxt3", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
259 { "GL_ANGLE_texture_compression_dxt5", o(ANGLE_texture_compression_dxt), GL | ES1 | ES2, 2011 },
260 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
261 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
262 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
263 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 },
264 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 },
265 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 },
266 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 },
267 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 },
268 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
269 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
270 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
271 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
272 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
273 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 },
274 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
275 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 },
276 { "GL_EXT_texture", o(dummy_true), GLL, 1996 },
277 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 },
278 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
279 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
280 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
281 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
282 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
283 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
284 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
285 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
286 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
287 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
288 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 },
289 { "GL_EXT_color_buffer_float", o(dummy_true), ES3, 2013 },
290
291 /* OES extensions */
292 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
293 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
294 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
295 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
296 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
297 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
298 { "GL_OES_depth24", o(dummy_true), ES1 | ES2, 2005 },
299 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
300 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
301 { "GL_OES_depth_texture_cube_map", o(OES_depth_texture_cube_map), ES2, 2012 },
302 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
303 { "GL_OES_EGL_sync", o(dummy_true), ES1 | ES2, 2010 },
304 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
305 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
306 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
307 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
308 { "GL_OES_fbo_render_mipmap", o(dummy_true), ES1 | ES2, 2005 },
309 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
310 { "GL_OES_framebuffer_object", o(dummy_true), ES1, 2005 },
311 { "GL_OES_get_program_binary", o(dummy_true), ES2, 2008 },
312 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
313 { "GL_OES_packed_depth_stencil", o(dummy_true), ES1 | ES2, 2007 },
314 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
315 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
316 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
317 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
318 { "GL_OES_rgb8_rgba8", o(dummy_true), ES1 | ES2, 2005 },
319 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
320 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
321 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
322 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
323 { "GL_OES_stencil8", o(dummy_true), ES1 | ES2, 2005 },
324 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
325 { "GL_OES_surfaceless_context", o(dummy_true), ES1 | ES2, 2012 },
326 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
327 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
328 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
329 { "GL_OES_texture_float", o(OES_texture_float), ES2, 2005 },
330 { "GL_OES_texture_float_linear", o(OES_texture_float_linear), ES2, 2005 },
331 { "GL_OES_texture_half_float", o(OES_texture_half_float), ES2, 2005 },
332 { "GL_OES_texture_half_float_linear", o(OES_texture_half_float_linear), ES2, 2005 },
333 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
334 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES1 | ES2, 2005 },
335 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 },
336
337 /* KHR extensions */
338 { "GL_KHR_debug", o(dummy_true), GL, 2012 },
339 { "GL_KHR_context_flush_control", o(dummy_true), GL | ES2, 2014 },
340
341 /* Vendor extensions */
342 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
343 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
344 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
345 { "GL_AMD_performance_monitor", o(AMD_performance_monitor), GL, 2007 },
346 { "GL_AMD_pinned_memory", o(AMD_pinned_memory), GL, 2013 },
347 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
348 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
349 { "GL_AMD_shader_trinary_minmax", o(dummy_true), GL, 2012 },
350 { "GL_AMD_vertex_shader_layer", o(AMD_vertex_shader_layer), GLC, 2012 },
351 { "GL_AMD_vertex_shader_viewport_index", o(AMD_vertex_shader_viewport_index), GLC, 2012 },
352 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
353 { "GL_APPLE_packed_pixels", o(dummy_true), GLL, 2002 },
354 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 },
355 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 },
356 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
357 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 },
358 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 },
359 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 },
360 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
361 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 },
362 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
363 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
364 { "GL_IBM_multimode_draw_arrays", o(dummy_true), GL, 1998 },
365 { "GL_IBM_rasterpos_clip", o(dummy_true), GLL, 1996 },
366 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 },
367 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
368 { "GL_INTEL_performance_query", o(INTEL_performance_query), GL | ES2, 2013 },
369 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
370 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
371 { "GL_MESA_window_pos", o(dummy_true), GLL, 2000 },
372 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
373 { "GL_NV_blend_square", o(dummy_true), GLL, 1999 },
374 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
375 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
376 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
377 { "GL_NV_fbo_color_attachments", o(dummy_true), ES2, 2010 },
378 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 },
379 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 },
380 { "GL_NV_light_max_exponent", o(dummy_true), GLL, 1999 },
381 { "GL_NV_packed_depth_stencil", o(dummy_true), GL, 2000 },
382 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
383 { "GL_NV_primitive_restart", o(NV_primitive_restart), GLL, 2002 },
384 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
385 { "GL_NV_texgen_reflection", o(dummy_true), GLL, 1999 },
386 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
387 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 },
388 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 },
389 { "GL_NV_vdpau_interop", o(NV_vdpau_interop), GL, 2010 },
390 { "GL_S3_s3tc", o(ANGLE_texture_compression_dxt), GL, 1999 },
391 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 },
392 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 },
393 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 },
394 { "GL_SGIS_texture_lod", o(dummy_true), GLL, 1997 },
395 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 },
396
397 { 0, 0, 0, 0 },
398 };
399
400
401 /**
402 * Given an extension name, lookup up the corresponding member of struct
403 * gl_extensions and return that member's offset (in bytes). If the name is
404 * not found in the \c extension_table, return 0.
405 *
406 * \param name Name of extension.
407 * \return Offset of member in struct gl_extensions.
408 */
409 static size_t
410 name_to_offset(const char* name)
411 {
412 const struct extension *i;
413
414 if (name == 0)
415 return 0;
416
417 for (i = extension_table; i->name != 0; ++i) {
418 if (strcmp(name, i->name) == 0)
419 return i->offset;
420 }
421
422 return 0;
423 }
424
425 /**
426 * Overrides extensions in \c ctx based on the values in
427 * _mesa_extension_override_enables and _mesa_extension_override_disables.
428 */
429 static void
430 override_extensions_in_context(struct gl_context *ctx)
431 {
432 const struct extension *i;
433 const GLboolean *enables =
434 (GLboolean*) &_mesa_extension_override_enables;
435 const GLboolean *disables =
436 (GLboolean*) &_mesa_extension_override_disables;
437 GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions;
438
439 for (i = extension_table; i->name != 0; ++i) {
440 size_t offset = i->offset;
441 assert(!enables[offset] || !disables[offset]);
442 if (enables[offset]) {
443 ctx_ext[offset] = 1;
444 } else if (disables[offset]) {
445 ctx_ext[offset] = 0;
446 }
447 }
448 }
449
450
451 /**
452 * Enable all extensions suitable for a software-only renderer.
453 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
454 */
455 void
456 _mesa_enable_sw_extensions(struct gl_context *ctx)
457 {
458 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
459 ctx->Extensions.ARB_depth_texture = GL_TRUE;
460 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
461 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
462 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
463 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
464 ctx->Extensions.ARB_fragment_program = GL_TRUE;
465 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
466 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
467 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
468 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
469 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
470 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
471 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
472 ctx->Extensions.ARB_point_sprite = GL_TRUE;
473 ctx->Extensions.ARB_shadow = GL_TRUE;
474 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
475 ctx->Extensions.ARB_texture_compression_bptc = GL_TRUE;
476 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
477 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
478 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
479 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
480 #ifdef TEXTURE_FLOAT_ENABLED
481 ctx->Extensions.ARB_texture_float = GL_TRUE;
482 #endif
483 ctx->Extensions.ARB_texture_mirror_clamp_to_edge = GL_TRUE;
484 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
485 ctx->Extensions.ARB_texture_rg = GL_TRUE;
486 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
487 ctx->Extensions.ARB_vertex_program = GL_TRUE;
488 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
489 ctx->Extensions.ARB_sync = GL_TRUE;
490 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
491 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
492 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
493 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
494 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
495 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
496 ctx->Extensions.EXT_blend_color = GL_TRUE;
497 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
498 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
499 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
500 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
501 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
502 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
503 ctx->Extensions.EXT_point_parameters = GL_TRUE;
504 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
505 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
506 ctx->Extensions.EXT_texture_array = GL_TRUE;
507 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
508 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
509 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
510 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
511 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
512 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
513 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
514 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
515 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
516 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
517 ctx->Extensions.MESA_pack_invert = GL_TRUE;
518 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
519 ctx->Extensions.NV_conditional_render = GL_TRUE;
520 ctx->Extensions.NV_point_sprite = GL_TRUE;
521 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
522 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
523 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
524 ctx->Extensions.OES_standard_derivatives = GL_TRUE;
525 ctx->Extensions.TDFX_texture_compression_FXT1 = GL_TRUE;
526 if (ctx->Mesa_DXTn) {
527 ctx->Extensions.ANGLE_texture_compression_dxt = GL_TRUE;
528 ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
529 }
530 }
531
532 /**
533 * Either enable or disable the named extension.
534 * \return offset of extensions withint `ext' or 0 if extension is not known
535 */
536 static size_t
537 set_extension(struct gl_extensions *ext, const char *name, GLboolean state)
538 {
539 size_t offset;
540
541 offset = name_to_offset(name);
542 if (offset != 0 && (offset != o(dummy_true) || state != GL_FALSE)) {
543 ((GLboolean *) ext)[offset] = state;
544 }
545
546 return offset;
547 }
548
549 /**
550 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
551 *
552 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
553 * enable or disable. The list is processed thus:
554 * - Enable recognized extension names that are prefixed with '+'.
555 * - Disable recognized extension names that are prefixed with '-'.
556 * - Enable recognized extension names that are not prefixed.
557 * - Collect unrecognized extension names in a new string.
558 *
559 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
560 * _mesa_one_time_init_extension_overrides. We just use the results of that
561 * parsing in this function.
562 *
563 * \return Space-separated list of unrecognized extension names (which must
564 * be freed). Does not return \c NULL.
565 */
566 static char *
567 get_extension_override( struct gl_context *ctx )
568 {
569 override_extensions_in_context(ctx);
570
571 if (cant_disable_extensions != NULL) {
572 _mesa_problem(ctx,
573 "Trying to disable permanently enabled extensions: %s",
574 cant_disable_extensions);
575 }
576
577 if (extra_extensions == NULL) {
578 return calloc(1, sizeof(char));
579 } else {
580 _mesa_problem(ctx, "Trying to enable unknown extensions: %s",
581 extra_extensions);
582 return strdup(extra_extensions);
583 }
584 }
585
586
587 /**
588 * \brief Free extra_extensions and cant_disable_extensions strings
589 *
590 * These strings are allocated early during the first context creation by
591 * _mesa_one_time_init_extension_overrides.
592 */
593 static void
594 free_unknown_extensions_strings(void)
595 {
596 free(extra_extensions);
597 free(cant_disable_extensions);
598 }
599
600
601 /**
602 * \brief Initialize extension override tables.
603 *
604 * This should be called one time early during first context initialization.
605 */
606 void
607 _mesa_one_time_init_extension_overrides(void)
608 {
609 const char *env_const = getenv("MESA_EXTENSION_OVERRIDE");
610 char *env;
611 char *ext;
612 int len;
613 size_t offset;
614
615 atexit(free_unknown_extensions_strings);
616
617 memset(&_mesa_extension_override_enables, 0, sizeof(struct gl_extensions));
618 memset(&_mesa_extension_override_disables, 0, sizeof(struct gl_extensions));
619
620 if (env_const == NULL) {
621 return;
622 }
623
624 /* extra_exts: List of unrecognized extensions. */
625 extra_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
626 cant_disable_extensions = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
627
628 /* Copy env_const because strtok() is destructive. */
629 env = strdup(env_const);
630
631 if (env == NULL || extra_extensions == NULL ||
632 cant_disable_extensions == NULL) {
633 free(env);
634 free(extra_extensions);
635 free(cant_disable_extensions);
636 return;
637 }
638
639 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
640 int enable;
641 bool recognized;
642 switch (ext[0]) {
643 case '+':
644 enable = 1;
645 ++ext;
646 break;
647 case '-':
648 enable = 0;
649 ++ext;
650 break;
651 default:
652 enable = 1;
653 break;
654 }
655
656 offset = set_extension(&_mesa_extension_override_enables, ext, enable);
657 if (offset != 0 && (offset != o(dummy_true) || enable != GL_FALSE)) {
658 ((GLboolean *) &_mesa_extension_override_disables)[offset] = !enable;
659 recognized = true;
660 } else {
661 recognized = false;
662 }
663
664 if (!recognized) {
665 if (enable) {
666 strcat(extra_extensions, ext);
667 strcat(extra_extensions, " ");
668 } else if (offset == o(dummy_true)) {
669 strcat(cant_disable_extensions, ext);
670 strcat(cant_disable_extensions, " ");
671 }
672 }
673 }
674
675 free(env);
676
677 /* Remove trailing space, and free if unused. */
678 len = strlen(extra_extensions);
679 if (len == 0) {
680 free(extra_extensions);
681 extra_extensions = NULL;
682 } else if (extra_extensions[len - 1] == ' ') {
683 extra_extensions[len - 1] = '\0';
684 }
685 len = strlen(cant_disable_extensions);
686 if (len == 0) {
687 free(cant_disable_extensions);
688 cant_disable_extensions = NULL;
689 } else if (cant_disable_extensions[len - 1] == ' ') {
690 cant_disable_extensions[len - 1] = '\0';
691 }
692 }
693
694
695 /**
696 * \brief Initialize extension tables and enable default extensions.
697 *
698 * This should be called during context initialization.
699 * Note: Sets gl_extensions.dummy_true to true.
700 */
701 void
702 _mesa_init_extensions(struct gl_extensions *extensions)
703 {
704 GLboolean *base = (GLboolean *) extensions;
705 GLboolean *sentinel = base + o(extension_sentinel);
706 GLboolean *i;
707
708 /* First, turn all extensions off. */
709 for (i = base; i != sentinel; ++i)
710 *i = GL_FALSE;
711
712 /* Then, selectively turn default extensions on. */
713 extensions->dummy_true = GL_TRUE;
714 extensions->EXT_texture3D = GL_TRUE;
715 }
716
717
718 typedef unsigned short extension_index;
719
720
721 /**
722 * Compare two entries of the extensions table. Sorts first by year,
723 * then by name.
724 *
725 * Arguments are indices into extension_table.
726 */
727 static int
728 extension_compare(const void *p1, const void *p2)
729 {
730 extension_index i1 = * (const extension_index *) p1;
731 extension_index i2 = * (const extension_index *) p2;
732 const struct extension *e1 = &extension_table[i1];
733 const struct extension *e2 = &extension_table[i2];
734 int res;
735
736 res = (int)e1->year - (int)e2->year;
737
738 if (res == 0) {
739 res = strcmp(e1->name, e2->name);
740 }
741
742 return res;
743 }
744
745
746 /**
747 * Construct the GL_EXTENSIONS string. Called the first time that
748 * glGetString(GL_EXTENSIONS) is called.
749 */
750 GLubyte*
751 _mesa_make_extension_string(struct gl_context *ctx)
752 {
753 /* The extension string. */
754 char *exts = 0;
755 /* Length of extension string. */
756 size_t length = 0;
757 /* Number of extensions */
758 unsigned count;
759 /* Indices of the extensions sorted by year */
760 extension_index *extension_indices;
761 /* String of extra extensions. */
762 char *extra_extensions = get_extension_override(ctx);
763 GLboolean *base = (GLboolean *) &ctx->Extensions;
764 const struct extension *i;
765 unsigned j;
766 unsigned maxYear = ~0;
767 unsigned api_set = (1 << ctx->API);
768 if (_mesa_is_gles3(ctx))
769 api_set |= ES3;
770
771 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
772 {
773 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
774 if (env) {
775 maxYear = atoi(env);
776 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
777 maxYear);
778 }
779 }
780
781 /* Compute length of the extension string. */
782 count = 0;
783 for (i = extension_table; i->name != 0; ++i) {
784 if (base[i->offset] &&
785 i->year <= maxYear &&
786 (i->api_set & api_set)) {
787 length += strlen(i->name) + 1; /* +1 for space */
788 ++count;
789 }
790 }
791 if (extra_extensions != NULL)
792 length += 1 + strlen(extra_extensions); /* +1 for space */
793
794 exts = calloc(ALIGN(length + 1, 4), sizeof(char));
795 if (exts == NULL) {
796 free(extra_extensions);
797 return NULL;
798 }
799
800 extension_indices = malloc(count * sizeof(extension_index));
801 if (extension_indices == NULL) {
802 free(exts);
803 free(extra_extensions);
804 return NULL;
805 }
806
807 /* Sort extensions in chronological order because certain old applications
808 * (e.g., Quake3 demo) store the extension list in a static size buffer so
809 * chronologically order ensure that the extensions that such applications
810 * expect will fit into that buffer.
811 */
812 j = 0;
813 for (i = extension_table; i->name != 0; ++i) {
814 if (base[i->offset] &&
815 i->year <= maxYear &&
816 (i->api_set & api_set)) {
817 extension_indices[j++] = i - extension_table;
818 }
819 }
820 assert(j == count);
821 qsort(extension_indices, count,
822 sizeof *extension_indices, extension_compare);
823
824 /* Build the extension string.*/
825 for (j = 0; j < count; ++j) {
826 i = &extension_table[extension_indices[j]];
827 assert(base[i->offset] && (i->api_set & api_set));
828 strcat(exts, i->name);
829 strcat(exts, " ");
830 }
831 free(extension_indices);
832 if (extra_extensions != 0) {
833 strcat(exts, extra_extensions);
834 free(extra_extensions);
835 }
836
837 return (GLubyte *) exts;
838 }
839
840 /**
841 * Return number of enabled extensions.
842 */
843 GLuint
844 _mesa_get_extension_count(struct gl_context *ctx)
845 {
846 GLboolean *base;
847 const struct extension *i;
848 unsigned api_set = (1 << ctx->API);
849 if (_mesa_is_gles3(ctx))
850 api_set |= ES3;
851
852 /* only count once */
853 if (ctx->Extensions.Count != 0)
854 return ctx->Extensions.Count;
855
856 base = (GLboolean *) &ctx->Extensions;
857 for (i = extension_table; i->name != 0; ++i) {
858 if (base[i->offset] && (i->api_set & api_set)) {
859 ctx->Extensions.Count++;
860 }
861 }
862 return ctx->Extensions.Count;
863 }
864
865 /**
866 * Return name of i-th enabled extension
867 */
868 const GLubyte *
869 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
870 {
871 const GLboolean *base;
872 size_t n;
873 const struct extension *i;
874 unsigned api_set = (1 << ctx->API);
875 if (_mesa_is_gles3(ctx))
876 api_set |= ES3;
877
878 base = (GLboolean*) &ctx->Extensions;
879 n = 0;
880 for (i = extension_table; i->name != 0; ++i) {
881 if (base[i->offset] && (i->api_set & api_set)) {
882 if (n == index)
883 return (const GLubyte*) i->name;
884 else
885 ++n;
886 }
887 }
888
889 return NULL;
890 }