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mesa: remove FEATURE_texture_s3tc define.
[mesa.git] / src / mesa / main / extensions.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.6
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * \file
29 * \brief Extension handling
30 */
31
32
33 #include "glheader.h"
34 #include "imports.h"
35 #include "context.h"
36 #include "extensions.h"
37 #include "mfeatures.h"
38 #include "mtypes.h"
39
40 #define ALIGN(value, alignment) (((value) + alignment - 1) & ~(alignment - 1))
41
42 enum {
43 DISABLE = 0,
44 GLL = 1 << API_OPENGL, /* GL Legacy / Compatibility */
45 GLC = 1 << API_OPENGL_CORE, /* GL Core */
46 GL = (1 << API_OPENGL) | (1 << API_OPENGL_CORE),
47 ES1 = 1 << API_OPENGLES,
48 ES2 = 1 << API_OPENGLES2,
49 };
50
51 /**
52 * \brief An element of the \c extension_table.
53 */
54 struct extension {
55 /** Name of extension, such as "GL_ARB_depth_clamp". */
56 const char *name;
57
58 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
59 size_t offset;
60
61 /** Set of API's in which the extension exists, as a bitset. */
62 uint8_t api_set;
63
64 /** Year the extension was proposed or approved. Used to sort the
65 * extension string chronologically. */
66 uint16_t year;
67 };
68
69
70 /**
71 * Given a member \c x of struct gl_extensions, return offset of
72 * \c x in bytes.
73 */
74 #define o(x) offsetof(struct gl_extensions, x)
75
76
77 /**
78 * \brief Table of supported OpenGL extensions for all API's.
79 */
80 static const struct extension extension_table[] = {
81 /* ARB Extensions */
82 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 },
83 { "GL_ARB_base_instance", o(ARB_base_instance), GL, 2011 },
84 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 },
85 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
86 { "GL_ARB_copy_buffer", o(ARB_copy_buffer), GL, 2008 },
87 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
88 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 },
89 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
90 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
91 { "GL_ARB_depth_texture", o(ARB_depth_texture), GLL, 2001 },
92 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 },
93 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
94 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
95 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
96 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
97 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
98 { "GL_ARB_fragment_program", o(ARB_fragment_program), GLL, 2002 },
99 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GLL, 2003 },
100 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
101 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
102 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
103 { "GL_ARB_half_float_pixel", o(ARB_half_float_pixel), GL, 2003 },
104 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
105 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
106 { "GL_ARB_invalidate_subdata", o(dummy_true), GL, 2012 },
107 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
108 { "GL_ARB_multisample", o(dummy_true), GLL, 1994 },
109 { "GL_ARB_multitexture", o(dummy_true), GLL, 1998 },
110 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
111 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GLL, 2001 },
112 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
113 { "GL_ARB_point_parameters", o(EXT_point_parameters), GLL, 1997 },
114 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
115 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
116 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
117 { "GL_ARB_sampler_objects", o(dummy_true), GL, 2009 },
118 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
119 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
120 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 },
121 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
122 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
123 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GLL, 2003 },
124 { "GL_ARB_shadow", o(ARB_shadow), GLL, 2001 },
125 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
126 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 2000 },
127 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 },
128 { "GL_ARB_texture_compression", o(dummy_true), GLL, 2000 },
129 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
130 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GLL, 1999 },
131 { "GL_ARB_texture_env_add", o(dummy_true), GLL, 1999 },
132 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GLL, 2001 },
133 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GLL, 2001 },
134 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GLL, 2001 },
135 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
136 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GLL, 2001 },
137 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
138 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
139 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
140 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
141 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
142 { "GL_ARB_texture_storage", o(ARB_texture_storage), GL, 2011 },
143 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
144 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
145 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
146 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
147 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
148 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GLL, 1999 },
149 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
150 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
151 { "GL_ARB_vertex_array_object", o(dummy_true), GL, 2006 },
152 { "GL_ARB_vertex_buffer_object", o(dummy_true), GLL, 2003 },
153 { "GL_ARB_vertex_program", o(ARB_vertex_program), GLL, 2002 },
154 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
155 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
156 { "GL_ARB_window_pos", o(ARB_window_pos), GLL, 2001 },
157 /* EXT extensions */
158 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
159 { "GL_EXT_bgra", o(dummy_true), GLL, 1995 },
160 { "GL_EXT_blend_color", o(EXT_blend_color), GLL, 1995 },
161 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
162 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
163 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GLL | ES1 | ES2, 1995 },
164 { "GL_EXT_blend_subtract", o(dummy_true), GLL, 1995 },
165 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
166 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GLL, 1996 },
167 { "GL_EXT_copy_texture", o(dummy_true), GLL, 1995 },
168 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
169 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
170 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
171 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GLL, 1997 },
172 { "GL_EXT_fog_coord", o(EXT_fog_coord), GLL, 1999 },
173 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 },
174 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
175 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 },
176 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
177 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GLL, 2006 },
178 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
179 { "GL_EXT_multi_draw_arrays", o(dummy_true), GLL | ES1 | ES2, 1999 },
180 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 },
181 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
182 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GLL, 1997 },
183 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
184 { "GL_EXT_point_parameters", o(EXT_point_parameters), GLL, 1997 },
185 { "GL_EXT_polygon_offset", o(dummy_true), GLL, 1995 },
186 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
187 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GLL, 1997 },
188 { "GL_EXT_secondary_color", o(EXT_secondary_color), GLL, 1999 },
189 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GLL, 2008 },
190 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GLL, 1997 },
191 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GLL, 2002 },
192 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GLL, 2001 },
193 { "GL_EXT_stencil_wrap", o(dummy_true), GLL, 2002 },
194 { "GL_EXT_subtexture", o(dummy_true), GLL, 1995 },
195 { "GL_EXT_texture3D", o(EXT_texture3D), GLL, 1996 },
196 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
197 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 },
198 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
199 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
200 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
201 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GLL, 2001 },
202 { "GL_EXT_texture_edge_clamp", o(dummy_true), GLL, 1997 },
203 { "GL_EXT_texture_env_add", o(dummy_true), GLL, 1999 },
204 { "GL_EXT_texture_env_combine", o(dummy_true), GLL, 2000 },
205 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GLL, 2000 },
206 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
207 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
208 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
209 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
210 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
211 { "GL_EXT_texture_lod_bias", o(dummy_true), GLL | ES1, 1999 },
212 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
213 { "GL_EXT_texture_object", o(dummy_true), GLL, 1995 },
214 { "GL_EXT_texture", o(dummy_true), GLL, 1996 },
215 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GLL, 2004 },
216 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
217 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
218 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
219 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
220 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
221 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
222 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
223 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
224 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
225 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
226 { "GL_EXT_vertex_array", o(dummy_true), GLL, 1995 },
227
228 /* OES extensions */
229 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
230 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
231 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
232 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
233 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
234 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
235 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
236 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
237 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
238 #if FEATURE_OES_draw_texture
239 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
240 #endif
241 #if FEATURE_OES_EGL_image
242 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
243 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
244 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
245 #endif
246 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
247 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
248 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
249 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 },
250 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
251 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 },
252 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 },
253 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
254 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
255 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
256 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
257 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
258 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
259 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
260 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
261 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
262 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
263 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
264 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
265 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
266 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
267 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
268 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 },
269 { "GL_OES_vertex_array_object", o(dummy_true), ES1 | ES2, 2010 },
270
271 /* Vendor extensions */
272 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
273 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
274 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
275 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
276 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
277 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
278 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GLL, 2002 },
279 { "GL_APPLE_texture_max_level", o(dummy_true), ES1 | ES2, 2009 },
280 { "GL_APPLE_vertex_array_object", o(dummy_true), GLL, 2002 },
281 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
282 { "GL_ATI_draw_buffers", o(dummy_true), GLL, 2002 },
283 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GLL, 2001 },
284 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GLL, 2001 },
285 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GLL, 2006 },
286 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
287 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GLL, 2002 },
288 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
289 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
290 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 },
291 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 },
292 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GLL, 1998 },
293 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GLL, 1999 },
294 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
295 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 },
296 { "GL_MESA_texture_array", o(MESA_texture_array), GLL, 2007 },
297 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
298 { "GL_MESA_window_pos", o(ARB_window_pos), GLL, 2000 },
299 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
300 { "GL_NV_blend_square", o(NV_blend_square), GLL, 1999 },
301 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
302 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
303 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
304 { "GL_NV_fbo_color_attachments", o(EXT_framebuffer_object), ES2, 2010 },
305 { "GL_NV_fog_distance", o(NV_fog_distance), GLL, 2001 },
306 { "GL_NV_fragment_program", o(NV_fragment_program), GLL, 2001 },
307 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GLL, 2005 },
308 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GLL, 1999 },
309 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 },
310 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
311 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 },
312 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
313 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GLL, 1999 },
314 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
315 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GLL, 1999 },
316 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GLL, 2000 },
317 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GLL, 2001 },
318 { "GL_NV_vertex_program", o(NV_vertex_program), GLL, 2000 },
319 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 },
320 { "GL_SGIS_generate_mipmap", o(dummy_true), GLL, 1997 },
321 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GLL, 1997 },
322 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GLL, 1997 },
323 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GLL, 1997 },
324 { "GL_SUN_multi_draw_arrays", o(dummy_true), GLL, 1999 },
325
326 { 0, 0, 0, 0 },
327 };
328
329
330 /**
331 * Given an extension name, lookup up the corresponding member of struct
332 * gl_extensions and return that member's offset (in bytes). If the name is
333 * not found in the \c extension_table, return 0.
334 *
335 * \param name Name of extension.
336 * \return Offset of member in struct gl_extensions.
337 */
338 static size_t
339 name_to_offset(const char* name)
340 {
341 const struct extension *i;
342
343 if (name == 0)
344 return 0;
345
346 for (i = extension_table; i->name != 0; ++i) {
347 if (strcmp(name, i->name) == 0)
348 return i->offset;
349 }
350
351 return 0;
352 }
353
354
355 /**
356 * \brief Extensions enabled by default.
357 *
358 * These extensions are enabled by _mesa_init_extensions().
359 *
360 * XXX: Should these defaults also apply to GLES?
361 */
362 static const size_t default_extensions[] = {
363 o(ARB_copy_buffer),
364 o(ARB_transpose_matrix),
365 o(ARB_window_pos),
366
367 o(EXT_compiled_vertex_array),
368 o(EXT_draw_range_elements),
369 o(EXT_packed_pixels),
370 o(EXT_rescale_normal),
371 o(EXT_separate_specular_color),
372 o(EXT_texture3D),
373
374 o(OES_standard_derivatives),
375
376 /* Vendor Extensions */
377 o(APPLE_packed_pixels),
378 o(IBM_multimode_draw_arrays),
379 o(IBM_rasterpos_clip),
380 o(NV_light_max_exponent),
381 o(NV_texgen_reflection),
382 o(SGIS_texture_lod),
383
384 0,
385 };
386
387
388 /**
389 * Enable all extensions suitable for a software-only renderer.
390 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
391 */
392 void
393 _mesa_enable_sw_extensions(struct gl_context *ctx)
394 {
395 /*ctx->Extensions.ARB_copy_buffer = GL_TRUE;*/
396 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
397 ctx->Extensions.ARB_depth_texture = GL_TRUE;
398 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
399 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
400 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
401 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
402 #if FEATURE_ARB_fragment_program
403 ctx->Extensions.ARB_fragment_program = GL_TRUE;
404 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
405 #endif
406 #if FEATURE_ARB_fragment_shader
407 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
408 #endif
409 #if FEATURE_ARB_framebuffer_object
410 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
411 #endif
412 #if FEATURE_ARB_geometry_shader4 && 0
413 /* XXX re-enable when GLSL compiler again supports geometry shaders */
414 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
415 #endif
416 ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
417 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
418 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
419 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
420 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
421 ctx->Extensions.ARB_point_sprite = GL_TRUE;
422 #if FEATURE_ARB_shader_objects
423 ctx->Extensions.ARB_shader_objects = GL_TRUE;
424 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
425 #endif
426 #if FEATURE_ARB_shading_language_100
427 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
428 #endif
429 ctx->Extensions.ARB_shadow = GL_TRUE;
430 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
431 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
432 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
433 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
434 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
435 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
436 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
437 ctx->Extensions.ARB_texture_rg = GL_TRUE;
438 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
439 ctx->Extensions.ARB_texture_storage = GL_TRUE;
440 #if FEATURE_ARB_vertex_program
441 ctx->Extensions.ARB_vertex_program = GL_TRUE;
442 #endif
443 #if FEATURE_ARB_vertex_shader
444 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
445 #endif
446 #if FEATURE_ARB_sync
447 ctx->Extensions.ARB_sync = GL_TRUE;
448 #endif
449 #if FEATURE_APPLE_object_purgeable
450 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
451 #endif
452 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
453 #if FEATURE_ATI_fragment_shader
454 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
455 #endif
456 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
457 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
458 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
459 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
460 ctx->Extensions.EXT_blend_color = GL_TRUE;
461 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
462 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
463 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
464 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
465 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
466 ctx->Extensions.EXT_fog_coord = GL_TRUE;
467 #if FEATURE_EXT_framebuffer_object
468 ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
469 #endif
470 #if FEATURE_EXT_framebuffer_blit
471 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
472 #endif
473 #if FEATURE_ARB_framebuffer_object
474 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
475 #endif
476 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
477 #if FEATURE_EXT_pixel_buffer_object
478 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
479 #endif
480 ctx->Extensions.EXT_point_parameters = GL_TRUE;
481 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
482 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
483 ctx->Extensions.EXT_secondary_color = GL_TRUE;
484 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
485 ctx->Extensions.EXT_texture_array = GL_TRUE;
486 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
487 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
488 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
489 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
490 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
491 #if FEATURE_EXT_texture_sRGB
492 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
493 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
494 #endif
495 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
496 #if FEATURE_EXT_transform_feedback
497 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
498 #endif
499 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
500 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
501 ctx->Extensions.MESA_pack_invert = GL_TRUE;
502 ctx->Extensions.MESA_resize_buffers = GL_TRUE;
503 ctx->Extensions.MESA_texture_array = GL_TRUE;
504 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
505 ctx->Extensions.NV_blend_square = GL_TRUE;
506 ctx->Extensions.NV_conditional_render = GL_TRUE;
507 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
508 ctx->Extensions.NV_point_sprite = GL_TRUE;
509 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
510 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
511 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
512 #if FEATURE_NV_vertex_program
513 ctx->Extensions.NV_vertex_program = GL_TRUE;
514 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
515 #endif
516 #if FEATURE_NV_fragment_program
517 ctx->Extensions.NV_fragment_program = GL_TRUE;
518 #endif
519 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
520 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
521 #endif
522 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
523 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
524 #endif
525 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
526 if (ctx->Mesa_DXTn) {
527 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
528 _mesa_enable_extension(ctx, "GL_S3_s3tc");
529 }
530 }
531
532
533 /**
534 * Enable all OpenGL 1.3 features and extensions.
535 * A convenience function to be called by drivers.
536 */
537 void
538 _mesa_enable_1_3_extensions(struct gl_context *ctx)
539 {
540 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
541 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
542 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
543 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
544 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
545 }
546
547
548
549 /**
550 * Enable all OpenGL 1.4 features and extensions.
551 * A convenience function to be called by drivers.
552 */
553 void
554 _mesa_enable_1_4_extensions(struct gl_context *ctx)
555 {
556 ctx->Extensions.ARB_depth_texture = GL_TRUE;
557 ctx->Extensions.ARB_shadow = GL_TRUE;
558 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
559 ctx->Extensions.ARB_window_pos = GL_TRUE;
560 ctx->Extensions.EXT_blend_color = GL_TRUE;
561 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
562 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
563 ctx->Extensions.EXT_fog_coord = GL_TRUE;
564 ctx->Extensions.EXT_point_parameters = GL_TRUE;
565 ctx->Extensions.EXT_secondary_color = GL_TRUE;
566 }
567
568
569 /**
570 * Enable all OpenGL 1.5 features and extensions.
571 * A convenience function to be called by drivers.
572 */
573 void
574 _mesa_enable_1_5_extensions(struct gl_context *ctx)
575 {
576 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
577 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
578 }
579
580
581 /**
582 * Enable all OpenGL 2.0 features and extensions.
583 * A convenience function to be called by drivers.
584 */
585 void
586 _mesa_enable_2_0_extensions(struct gl_context *ctx)
587 {
588 #if FEATURE_ARB_fragment_shader
589 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
590 #endif
591 ctx->Extensions.ARB_point_sprite = GL_TRUE;
592 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
593 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
594 #if FEATURE_ARB_shader_objects
595 ctx->Extensions.ARB_shader_objects = GL_TRUE;
596 #endif
597 #if FEATURE_ARB_shading_language_100
598 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
599 #endif
600 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
601 #if FEATURE_ARB_vertex_shader
602 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
603 #endif
604 }
605
606
607 /**
608 * Enable all OpenGL 2.1 features and extensions.
609 * A convenience function to be called by drivers.
610 */
611 void
612 _mesa_enable_2_1_extensions(struct gl_context *ctx)
613 {
614 #if FEATURE_EXT_pixel_buffer_object
615 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
616 #endif
617 #if FEATURE_EXT_texture_sRGB
618 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
619 #endif
620 }
621
622
623 /**
624 * Either enable or disable the named extension.
625 * \return GL_TRUE for success, GL_FALSE if invalid extension name
626 */
627 static GLboolean
628 set_extension( struct gl_context *ctx, const char *name, GLboolean state )
629 {
630 size_t offset;
631
632 if (ctx->Extensions.String) {
633 /* The string was already queried - can't change it now! */
634 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
635 return GL_FALSE;
636 }
637
638 offset = name_to_offset(name);
639 if (offset == 0) {
640 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
641 name);
642 return GL_FALSE;
643 } else if (offset == o(dummy_true) && state == GL_FALSE) {
644 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
645 "%s", name);
646 return GL_FALSE;
647 } else {
648 GLboolean *base = (GLboolean *) &ctx->Extensions;
649 base[offset] = state;
650 return GL_TRUE;
651 }
652 }
653
654
655 /**
656 * Enable the named extension.
657 * Typically called by drivers.
658 */
659 void
660 _mesa_enable_extension( struct gl_context *ctx, const char *name )
661 {
662 if (!set_extension(ctx, name, GL_TRUE))
663 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
664 }
665
666
667 /**
668 * Disable the named extension.
669 * XXX is this really needed???
670 */
671 void
672 _mesa_disable_extension( struct gl_context *ctx, const char *name )
673 {
674 if (!set_extension(ctx, name, GL_FALSE))
675 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
676 }
677
678
679 /**
680 * Test if the named extension is enabled in this context.
681 */
682 GLboolean
683 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
684 {
685 size_t offset;
686 GLboolean *base;
687
688 if (name == 0)
689 return GL_FALSE;
690
691 offset = name_to_offset(name);
692 if (offset == 0)
693 return GL_FALSE;
694 base = (GLboolean *) &ctx->Extensions;
695 return base[offset];
696 }
697
698
699 /**
700 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
701 *
702 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
703 * enable or disable. The list is processed thus:
704 * - Enable recognized extension names that are prefixed with '+'.
705 * - Disable recognized extension names that are prefixed with '-'.
706 * - Enable recognized extension names that are not prefixed.
707 * - Collect unrecognized extension names in a new string.
708 *
709 * \return Space-separated list of unrecognized extension names (which must
710 * be freed). Does not return \c NULL.
711 */
712 static char *
713 get_extension_override( struct gl_context *ctx )
714 {
715 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
716 char *env;
717 char *ext;
718 char *extra_exts;
719 int len;
720
721 if (env_const == NULL) {
722 /* Return the empty string rather than NULL. This simplifies the logic
723 * of client functions. */
724 return calloc(4, sizeof(char));
725 }
726
727 /* extra_exts: List of unrecognized extensions. */
728 extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
729
730 /* Copy env_const because strtok() is destructive. */
731 env = strdup(env_const);
732 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
733 int enable;
734 int recognized;
735 switch (ext[0]) {
736 case '+':
737 enable = 1;
738 ++ext;
739 break;
740 case '-':
741 enable = 0;
742 ++ext;
743 break;
744 default:
745 enable = 1;
746 break;
747 }
748 recognized = set_extension(ctx, ext, enable);
749 if (!recognized) {
750 strcat(extra_exts, ext);
751 strcat(extra_exts, " ");
752 }
753 }
754
755 free(env);
756
757 /* Remove trailing space. */
758 len = strlen(extra_exts);
759 if (len > 0 && extra_exts[len - 1] == ' ')
760 extra_exts[len - 1] = '\0';
761
762 return extra_exts;
763 }
764
765
766 /**
767 * \brief Initialize extension tables and enable default extensions.
768 *
769 * This should be called during context initialization.
770 * Note: Sets gl_extensions.dummy_true to true.
771 */
772 void
773 _mesa_init_extensions( struct gl_context *ctx )
774 {
775 GLboolean *base = (GLboolean *) &ctx->Extensions;
776 GLboolean *sentinel = base + o(extension_sentinel);
777 GLboolean *i;
778 const size_t *j;
779
780 /* First, turn all extensions off. */
781 for (i = base; i != sentinel; ++i)
782 *i = GL_FALSE;
783
784 /* Then, selectively turn default extensions on. */
785 ctx->Extensions.dummy_true = GL_TRUE;
786 for (j = default_extensions; *j != 0; ++j)
787 base[*j] = GL_TRUE;
788 }
789
790
791 typedef unsigned short extension_index;
792
793
794 /**
795 * Compare two entries of the extensions table. Sorts first by year,
796 * then by name.
797 *
798 * Arguments are indices into extension_table.
799 */
800 static int
801 extension_compare(const void *p1, const void *p2)
802 {
803 extension_index i1 = * (const extension_index *) p1;
804 extension_index i2 = * (const extension_index *) p2;
805 const struct extension *e1 = &extension_table[i1];
806 const struct extension *e2 = &extension_table[i2];
807 int res;
808
809 res = (int)e1->year - (int)e2->year;
810
811 if (res == 0) {
812 res = strcmp(e1->name, e2->name);
813 }
814
815 return res;
816 }
817
818
819 /**
820 * Construct the GL_EXTENSIONS string. Called the first time that
821 * glGetString(GL_EXTENSIONS) is called.
822 */
823 GLubyte*
824 _mesa_make_extension_string(struct gl_context *ctx)
825 {
826 /* The extension string. */
827 char *exts = 0;
828 /* Length of extension string. */
829 size_t length = 0;
830 /* Number of extensions */
831 unsigned count;
832 /* Indices of the extensions sorted by year */
833 extension_index *extension_indices;
834 /* String of extra extensions. */
835 char *extra_extensions = get_extension_override(ctx);
836 GLboolean *base = (GLboolean *) &ctx->Extensions;
837 const struct extension *i;
838 unsigned j;
839 unsigned maxYear = ~0;
840
841 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
842 {
843 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
844 if (env) {
845 maxYear = atoi(env);
846 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
847 maxYear);
848 }
849 }
850
851 /* Compute length of the extension string. */
852 count = 0;
853 for (i = extension_table; i->name != 0; ++i) {
854 if (base[i->offset] &&
855 i->year <= maxYear &&
856 (i->api_set & (1 << ctx->API))) {
857 length += strlen(i->name) + 1; /* +1 for space */
858 ++count;
859 }
860 }
861 if (extra_extensions != NULL)
862 length += 1 + strlen(extra_extensions); /* +1 for space */
863
864 exts = calloc(ALIGN(length + 1, 4), sizeof(char));
865 if (exts == NULL) {
866 free(extra_extensions);
867 return NULL;
868 }
869
870 extension_indices = malloc(count * sizeof(extension_index));
871 if (extension_indices == NULL) {
872 free(exts);
873 free(extra_extensions);
874 return NULL;
875 }
876
877 /* Sort extensions in chronological order because certain old applications (e.g.,
878 * Quake3 demo) store the extension list in a static size buffer so chronologically
879 * order ensure that the extensions that such applications expect will fit into
880 * that buffer.
881 */
882 j = 0;
883 for (i = extension_table; i->name != 0; ++i) {
884 if (base[i->offset] &&
885 i->year <= maxYear &&
886 (i->api_set & (1 << ctx->API))) {
887 extension_indices[j++] = i - extension_table;
888 }
889 }
890 assert(j == count);
891 qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
892
893 /* Build the extension string.*/
894 for (j = 0; j < count; ++j) {
895 i = &extension_table[extension_indices[j]];
896 assert(base[i->offset] && (i->api_set & (1 << ctx->API)));
897 strcat(exts, i->name);
898 strcat(exts, " ");
899 }
900 free(extension_indices);
901 if (extra_extensions != 0) {
902 strcat(exts, extra_extensions);
903 free(extra_extensions);
904 }
905
906 return (GLubyte *) exts;
907 }
908
909 /**
910 * Return number of enabled extensions.
911 */
912 GLuint
913 _mesa_get_extension_count(struct gl_context *ctx)
914 {
915 GLboolean *base;
916 const struct extension *i;
917
918 /* only count once */
919 if (ctx->Extensions.Count != 0)
920 return ctx->Extensions.Count;
921
922 base = (GLboolean *) &ctx->Extensions;
923 for (i = extension_table; i->name != 0; ++i) {
924 if (base[i->offset] && (i->api_set & (1 << ctx->API))) {
925 ctx->Extensions.Count++;
926 }
927 }
928 return ctx->Extensions.Count;
929 }
930
931 /**
932 * Return name of i-th enabled extension
933 */
934 const GLubyte *
935 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
936 {
937 const GLboolean *base;
938 size_t n;
939 const struct extension *i;
940
941 base = (GLboolean*) &ctx->Extensions;
942 n = 0;
943 for (i = extension_table; i->name != 0; ++i) {
944 if (base[i->offset] & (i->api_set & (1 << ctx->API))) {
945 if (n == index)
946 return (const GLubyte*) i->name;
947 else
948 ++n;
949 }
950 }
951
952 return NULL;
953 }