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[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 GL = 1 << API_OPENGL,
45 ES1 = 1 << API_OPENGLES,
46 ES2 = 1 << API_OPENGLES2,
47 };
48
49 /**
50 * \brief An element of the \c extension_table.
51 */
52 struct extension {
53 /** Name of extension, such as "GL_ARB_depth_clamp". */
54 const char *name;
55
56 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
57 size_t offset;
58
59 /** Set of API's in which the extension exists, as a bitset. */
60 uint8_t api_set;
61
62 /** Year the extension was proposed or approved. Used to sort the
63 * extension string chronologically. */
64 uint16_t year;
65 };
66
67
68 /**
69 * Given a member \c x of struct gl_extensions, return offset of
70 * \c x in bytes.
71 */
72 #define o(x) offsetof(struct gl_extensions, x)
73
74
75 /**
76 * \brief Table of supported OpenGL extensions for all API's.
77 */
78 static const struct extension extension_table[] = {
79 /* ARB Extensions */
80 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 },
81 { "GL_ARB_base_instance", o(ARB_base_instance), GL, 2011 },
82 { "GL_ARB_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 },
83 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
84 { "GL_ARB_copy_buffer", o(ARB_copy_buffer), GL, 2008 },
85 { "GL_ARB_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
86 { "GL_ARB_debug_output", o(dummy_true), GL, 2009 },
87 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
88 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
89 { "GL_ARB_depth_texture", o(ARB_depth_texture), GL, 2001 },
90 { "GL_ARB_draw_buffers", o(dummy_true), GL, 2002 },
91 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
92 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
93 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
94 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
95 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
96 { "GL_ARB_fragment_program", o(ARB_fragment_program), GL, 2002 },
97 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GL, 2003 },
98 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
99 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
100 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
101 { "GL_ARB_half_float_pixel", o(ARB_half_float_pixel), GL, 2003 },
102 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
103 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
104 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
105 { "GL_ARB_multisample", o(dummy_true), GL, 1994 },
106 { "GL_ARB_multitexture", o(dummy_true), GL, 1998 },
107 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
108 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GL, 2001 },
109 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
110 { "GL_ARB_point_parameters", o(EXT_point_parameters), GL, 1997 },
111 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
112 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
113 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
114 { "GL_ARB_sampler_objects", o(ARB_sampler_objects), GL, 2009 },
115 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
116 { "GL_ARB_shader_bit_encoding", o(ARB_shader_bit_encoding), GL, 2010 },
117 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 },
118 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
119 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
120 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GL, 2003 },
121 { "GL_ARB_shadow_ambient", o(ARB_shadow_ambient), GL, 2001 },
122 { "GL_ARB_shadow", o(ARB_shadow), GL, 2001 },
123 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
124 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GL, 2000 },
125 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 },
126 { "GL_ARB_texture_compression", o(dummy_true), GL, 2000 },
127 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
128 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GL, 1999 },
129 { "GL_ARB_texture_env_add", o(dummy_true), GL, 1999 },
130 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GL, 2001 },
131 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GL, 2001 },
132 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GL, 2001 },
133 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
134 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GL, 2001 },
135 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
136 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
137 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
138 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
139 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
140 { "GL_ARB_texture_storage", o(ARB_texture_storage), GL, 2011 },
141 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
142 { "GL_ARB_timer_query", o(ARB_timer_query), GL, 2010 },
143 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
144 { "GL_ARB_transform_feedback3", o(ARB_transform_feedback3), GL, 2010 },
145 { "GL_ARB_transform_feedback_instanced", o(ARB_transform_feedback_instanced), GL, 2011 },
146 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GL, 1999 },
147 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2009 },
148 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
149 { "GL_ARB_vertex_array_object", o(ARB_vertex_array_object), GL, 2006 },
150 { "GL_ARB_vertex_buffer_object", o(dummy_true), GL, 2003 },
151 { "GL_ARB_vertex_program", o(ARB_vertex_program), GL, 2002 },
152 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
153 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
154 { "GL_ARB_window_pos", o(ARB_window_pos), GL, 2001 },
155 /* EXT extensions */
156 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
157 { "GL_EXT_bgra", o(dummy_true), GL, 1995 },
158 { "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 },
159 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
160 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
161 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 },
162 { "GL_EXT_blend_subtract", o(dummy_true), GL, 1995 },
163 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
164 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GL, 1996 },
165 { "GL_EXT_copy_texture", o(dummy_true), GL, 1995 },
166 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
167 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
168 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
169 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GL, 1997 },
170 { "GL_EXT_fog_coord", o(EXT_fog_coord), GL, 1999 },
171 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 },
172 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
173 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 },
174 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
175 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GL, 2006 },
176 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
177 { "GL_EXT_multi_draw_arrays", o(dummy_true), GL | ES1 | ES2, 1999 },
178 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 },
179 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
180 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GL, 1997 },
181 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
182 { "GL_EXT_point_parameters", o(EXT_point_parameters), GL, 1997 },
183 { "GL_EXT_polygon_offset", o(dummy_true), GL, 1995 },
184 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
185 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GL, 1997 },
186 { "GL_EXT_secondary_color", o(EXT_secondary_color), GL, 1999 },
187 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GL, 2008 },
188 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GL, 1997 },
189 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GL, 2002 },
190 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GL, 2001 },
191 { "GL_EXT_stencil_wrap", o(dummy_true), GL, 2002 },
192 { "GL_EXT_subtexture", o(dummy_true), GL, 1995 },
193 { "GL_EXT_texture3D", o(EXT_texture3D), GL, 1996 },
194 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
195 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 },
196 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
197 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
198 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
199 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GL, 2001 },
200 { "GL_EXT_texture_edge_clamp", o(dummy_true), GL, 1997 },
201 { "GL_EXT_texture_env_add", o(dummy_true), GL, 1999 },
202 { "GL_EXT_texture_env_combine", o(dummy_true), GL, 2000 },
203 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GL, 2000 },
204 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
205 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
206 { "GL_EXT_texture_rg", o(ARB_texture_rg), ES2, 2011 },
207 { "GL_EXT_read_format_bgra", o(dummy_true), ES1 | ES2, 2009 },
208 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
209 { "GL_EXT_texture_lod_bias", o(dummy_true), GL | ES1, 1999 },
210 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
211 { "GL_EXT_texture_object", o(dummy_true), GL, 1995 },
212 { "GL_EXT_texture", o(dummy_true), GL, 1996 },
213 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
214 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
215 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
216 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
217 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
218 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
219 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
220 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
221 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
222 { "GL_EXT_unpack_subimage", o(dummy_true), ES2, 2011 },
223 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
224 { "GL_EXT_vertex_array", o(dummy_true), GL, 1995 },
225
226 /* OES extensions */
227 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
228 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
229 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
230 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
231 { "GL_OES_compressed_ETC1_RGB8_texture", o(OES_compressed_ETC1_RGB8_texture), ES1 | ES2, 2005 },
232 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
233 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
234 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
235 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
236 #if FEATURE_OES_draw_texture
237 { "GL_OES_draw_texture", o(OES_draw_texture), ES1, 2004 },
238 #endif
239 #if FEATURE_OES_EGL_image
240 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
241 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
242 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
243 #endif
244 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
245 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
246 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
247 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 },
248 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
249 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 },
250 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 },
251 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
252 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
253 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
254 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
255 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
256 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
257 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
258 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
259 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
260 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
261 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
262 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
263 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
264 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
265 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
266 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 },
267
268 /* Vendor extensions */
269 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
270 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
271 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
272 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
273 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
274 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
275 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GL, 2002 },
276 { "GL_APPLE_vertex_array_object", o(APPLE_vertex_array_object), GL, 2002 },
277 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
278 { "GL_ATI_draw_buffers", o(dummy_true), GL, 2002 },
279 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GL, 2001 },
280 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GL, 2001 },
281 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GL, 2006 },
282 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
283 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GL, 2002 },
284 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
285 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
286 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 },
287 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 },
288 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GL, 1998 },
289 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
290 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
291 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 },
292 { "GL_MESA_texture_array", o(MESA_texture_array), GL, 2007 },
293 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
294 { "GL_MESA_window_pos", o(ARB_window_pos), GL, 2000 },
295 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
296 { "GL_NV_blend_square", o(NV_blend_square), GL, 1999 },
297 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
298 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
299 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
300 { "GL_NV_fbo_color_attachments", o(EXT_framebuffer_object), ES2, 2010 },
301 { "GL_NV_fog_distance", o(NV_fog_distance), GL, 2001 },
302 { "GL_NV_fragment_program", o(NV_fragment_program), GL, 2001 },
303 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GL, 2005 },
304 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GL, 1999 },
305 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 },
306 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
307 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 },
308 { "GL_NV_read_buffer", o(dummy_true), ES2, 2011 },
309 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GL, 1999 },
310 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
311 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GL, 1999 },
312 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GL, 2000 },
313 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GL, 2001 },
314 { "GL_NV_vertex_program", o(NV_vertex_program), GL, 2000 },
315 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 },
316 { "GL_SGIS_generate_mipmap", o(dummy_true), GL, 1997 },
317 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GL, 1997 },
318 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GL, 1997 },
319 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GL, 1997 },
320 { "GL_SUN_multi_draw_arrays", o(dummy_true), GL, 1999 },
321
322 { 0, 0, 0, 0 },
323 };
324
325
326 /**
327 * Given an extension name, lookup up the corresponding member of struct
328 * gl_extensions and return that member's offset (in bytes). If the name is
329 * not found in the \c extension_table, return 0.
330 *
331 * \param name Name of extension.
332 * \return Offset of member in struct gl_extensions.
333 */
334 static size_t
335 name_to_offset(const char* name)
336 {
337 const struct extension *i;
338
339 if (name == 0)
340 return 0;
341
342 for (i = extension_table; i->name != 0; ++i) {
343 if (strcmp(name, i->name) == 0)
344 return i->offset;
345 }
346
347 return 0;
348 }
349
350
351 /**
352 * \brief Extensions enabled by default.
353 *
354 * These extensions are enabled by _mesa_init_extensions().
355 *
356 * XXX: Should these defaults also apply to GLES?
357 */
358 static const size_t default_extensions[] = {
359 o(ARB_copy_buffer),
360 o(ARB_transpose_matrix),
361 o(ARB_window_pos),
362
363 o(EXT_compiled_vertex_array),
364 o(EXT_draw_range_elements),
365 o(EXT_packed_pixels),
366 o(EXT_rescale_normal),
367 o(EXT_separate_specular_color),
368 o(EXT_texture3D),
369
370 o(OES_standard_derivatives),
371
372 /* Vendor Extensions */
373 o(APPLE_packed_pixels),
374 o(IBM_multimode_draw_arrays),
375 o(IBM_rasterpos_clip),
376 o(NV_light_max_exponent),
377 o(NV_texgen_reflection),
378 o(SGIS_texture_lod),
379
380 0,
381 };
382
383
384 /**
385 * Enable all extensions suitable for a software-only renderer.
386 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
387 */
388 void
389 _mesa_enable_sw_extensions(struct gl_context *ctx)
390 {
391 /*ctx->Extensions.ARB_copy_buffer = GL_TRUE;*/
392 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
393 ctx->Extensions.ARB_depth_texture = GL_TRUE;
394 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
395 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
396 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
397 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
398 #if FEATURE_ARB_fragment_program
399 ctx->Extensions.ARB_fragment_program = GL_TRUE;
400 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
401 #endif
402 #if FEATURE_ARB_fragment_shader
403 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
404 #endif
405 #if FEATURE_ARB_framebuffer_object
406 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
407 #endif
408 #if FEATURE_ARB_geometry_shader4 && 0
409 /* XXX re-enable when GLSL compiler again supports geometry shaders */
410 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
411 #endif
412 ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
413 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
414 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
415 #if FEATURE_queryobj
416 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
417 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
418 #endif
419 ctx->Extensions.ARB_point_sprite = GL_TRUE;
420 #if FEATURE_ARB_shader_objects
421 ctx->Extensions.ARB_shader_objects = GL_TRUE;
422 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
423 #endif
424 #if FEATURE_ARB_shading_language_100
425 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
426 #endif
427 ctx->Extensions.ARB_shadow = GL_TRUE;
428 ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
429 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
430 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
431 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
432 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
433 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
434 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
435 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
436 ctx->Extensions.ARB_texture_rg = GL_TRUE;
437 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
438 ctx->Extensions.ARB_texture_storage = GL_TRUE;
439 ctx->Extensions.ARB_vertex_array_object = 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 ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
450 #if FEATURE_APPLE_object_purgeable
451 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
452 #endif
453 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
454 #if FEATURE_ATI_fragment_shader
455 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
456 #endif
457 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
458 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
459 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
460 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
461 ctx->Extensions.EXT_blend_color = GL_TRUE;
462 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
463 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
464 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
465 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
466 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
467 ctx->Extensions.EXT_fog_coord = GL_TRUE;
468 #if FEATURE_EXT_framebuffer_object
469 ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
470 #endif
471 #if FEATURE_EXT_framebuffer_blit
472 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
473 #endif
474 #if FEATURE_ARB_framebuffer_object
475 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
476 #endif
477 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
478 #if FEATURE_EXT_pixel_buffer_object
479 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
480 #endif
481 ctx->Extensions.EXT_point_parameters = GL_TRUE;
482 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
483 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
484 ctx->Extensions.EXT_secondary_color = GL_TRUE;
485 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
486 ctx->Extensions.EXT_texture_array = GL_TRUE;
487 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
488 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
489 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
490 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
491 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
492 #if FEATURE_EXT_texture_sRGB
493 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
494 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
495 #endif
496 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
497 #if FEATURE_EXT_transform_feedback
498 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
499 #endif
500 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
501 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
502 ctx->Extensions.MESA_pack_invert = GL_TRUE;
503 ctx->Extensions.MESA_resize_buffers = GL_TRUE;
504 ctx->Extensions.MESA_texture_array = GL_TRUE;
505 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
506 ctx->Extensions.NV_blend_square = GL_TRUE;
507 ctx->Extensions.NV_conditional_render = GL_TRUE;
508 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
509 ctx->Extensions.NV_point_sprite = GL_TRUE;
510 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
511 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
512 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
513 #if FEATURE_NV_vertex_program
514 ctx->Extensions.NV_vertex_program = GL_TRUE;
515 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
516 #endif
517 #if FEATURE_NV_fragment_program
518 ctx->Extensions.NV_fragment_program = GL_TRUE;
519 #endif
520 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
521 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
522 #endif
523 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
524 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
525 #endif
526 #if FEATURE_texture_fxt1
527 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
528 #endif
529 #if FEATURE_texture_s3tc
530 if (ctx->Mesa_DXTn) {
531 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
532 _mesa_enable_extension(ctx, "GL_S3_s3tc");
533 }
534 #endif
535 }
536
537
538 /**
539 * Enable all OpenGL 1.3 features and extensions.
540 * A convenience function to be called by drivers.
541 */
542 void
543 _mesa_enable_1_3_extensions(struct gl_context *ctx)
544 {
545 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
546 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
547 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
548 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
549 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
550 }
551
552
553
554 /**
555 * Enable all OpenGL 1.4 features and extensions.
556 * A convenience function to be called by drivers.
557 */
558 void
559 _mesa_enable_1_4_extensions(struct gl_context *ctx)
560 {
561 ctx->Extensions.ARB_depth_texture = GL_TRUE;
562 ctx->Extensions.ARB_shadow = GL_TRUE;
563 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
564 ctx->Extensions.ARB_window_pos = GL_TRUE;
565 ctx->Extensions.EXT_blend_color = GL_TRUE;
566 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
567 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
568 ctx->Extensions.EXT_fog_coord = GL_TRUE;
569 ctx->Extensions.EXT_point_parameters = GL_TRUE;
570 ctx->Extensions.EXT_secondary_color = GL_TRUE;
571 }
572
573
574 /**
575 * Enable all OpenGL 1.5 features and extensions.
576 * A convenience function to be called by drivers.
577 */
578 void
579 _mesa_enable_1_5_extensions(struct gl_context *ctx)
580 {
581 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
582 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
583 }
584
585
586 /**
587 * Enable all OpenGL 2.0 features and extensions.
588 * A convenience function to be called by drivers.
589 */
590 void
591 _mesa_enable_2_0_extensions(struct gl_context *ctx)
592 {
593 #if FEATURE_ARB_fragment_shader
594 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
595 #endif
596 ctx->Extensions.ARB_point_sprite = GL_TRUE;
597 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
598 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
599 #if FEATURE_ARB_shader_objects
600 ctx->Extensions.ARB_shader_objects = GL_TRUE;
601 #endif
602 #if FEATURE_ARB_shading_language_100
603 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
604 #endif
605 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
606 #if FEATURE_ARB_vertex_shader
607 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
608 #endif
609 }
610
611
612 /**
613 * Enable all OpenGL 2.1 features and extensions.
614 * A convenience function to be called by drivers.
615 */
616 void
617 _mesa_enable_2_1_extensions(struct gl_context *ctx)
618 {
619 #if FEATURE_EXT_pixel_buffer_object
620 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
621 #endif
622 #if FEATURE_EXT_texture_sRGB
623 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
624 #endif
625 }
626
627
628 /**
629 * Either enable or disable the named extension.
630 * \return GL_TRUE for success, GL_FALSE if invalid extension name
631 */
632 static GLboolean
633 set_extension( struct gl_context *ctx, const char *name, GLboolean state )
634 {
635 size_t offset;
636
637 if (ctx->Extensions.String) {
638 /* The string was already queried - can't change it now! */
639 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
640 return GL_FALSE;
641 }
642
643 offset = name_to_offset(name);
644 if (offset == 0) {
645 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
646 name);
647 return GL_FALSE;
648 } else if (offset == o(dummy_true) && state == GL_FALSE) {
649 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
650 "%s", name);
651 return GL_FALSE;
652 } else {
653 GLboolean *base = (GLboolean *) &ctx->Extensions;
654 base[offset] = state;
655 return GL_TRUE;
656 }
657 }
658
659
660 /**
661 * Enable the named extension.
662 * Typically called by drivers.
663 */
664 void
665 _mesa_enable_extension( struct gl_context *ctx, const char *name )
666 {
667 if (!set_extension(ctx, name, GL_TRUE))
668 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
669 }
670
671
672 /**
673 * Disable the named extension.
674 * XXX is this really needed???
675 */
676 void
677 _mesa_disable_extension( struct gl_context *ctx, const char *name )
678 {
679 if (!set_extension(ctx, name, GL_FALSE))
680 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
681 }
682
683
684 /**
685 * Test if the named extension is enabled in this context.
686 */
687 GLboolean
688 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
689 {
690 size_t offset;
691 GLboolean *base;
692
693 if (name == 0)
694 return GL_FALSE;
695
696 offset = name_to_offset(name);
697 if (offset == 0)
698 return GL_FALSE;
699 base = (GLboolean *) &ctx->Extensions;
700 return base[offset];
701 }
702
703
704 /**
705 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
706 *
707 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
708 * enable or disable. The list is processed thus:
709 * - Enable recognized extension names that are prefixed with '+'.
710 * - Disable recognized extension names that are prefixed with '-'.
711 * - Enable recognized extension names that are not prefixed.
712 * - Collect unrecognized extension names in a new string.
713 *
714 * \return Space-separated list of unrecognized extension names (which must
715 * be freed). Does not return \c NULL.
716 */
717 static char *
718 get_extension_override( struct gl_context *ctx )
719 {
720 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
721 char *env;
722 char *ext;
723 char *extra_exts;
724 int len;
725
726 if (env_const == NULL) {
727 /* Return the empty string rather than NULL. This simplifies the logic
728 * of client functions. */
729 return calloc(4, sizeof(char));
730 }
731
732 /* extra_exts: List of unrecognized extensions. */
733 extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
734
735 /* Copy env_const because strtok() is destructive. */
736 env = strdup(env_const);
737 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
738 int enable;
739 int recognized;
740 switch (ext[0]) {
741 case '+':
742 enable = 1;
743 ++ext;
744 break;
745 case '-':
746 enable = 0;
747 ++ext;
748 break;
749 default:
750 enable = 1;
751 break;
752 }
753 recognized = set_extension(ctx, ext, enable);
754 if (!recognized) {
755 strcat(extra_exts, ext);
756 strcat(extra_exts, " ");
757 }
758 }
759
760 free(env);
761
762 /* Remove trailing space. */
763 len = strlen(extra_exts);
764 if (len > 0 && extra_exts[len - 1] == ' ')
765 extra_exts[len - 1] = '\0';
766
767 return extra_exts;
768 }
769
770
771 /**
772 * \brief Initialize extension tables and enable default extensions.
773 *
774 * This should be called during context initialization.
775 * Note: Sets gl_extensions.dummy_true to true.
776 */
777 void
778 _mesa_init_extensions( struct gl_context *ctx )
779 {
780 GLboolean *base = (GLboolean *) &ctx->Extensions;
781 GLboolean *sentinel = base + o(extension_sentinel);
782 GLboolean *i;
783 const size_t *j;
784
785 /* First, turn all extensions off. */
786 for (i = base; i != sentinel; ++i)
787 *i = GL_FALSE;
788
789 /* Then, selectively turn default extensions on. */
790 ctx->Extensions.dummy_true = GL_TRUE;
791 for (j = default_extensions; *j != 0; ++j)
792 base[*j] = GL_TRUE;
793 }
794
795
796 typedef unsigned short extension_index;
797
798
799 /**
800 * Compare two entries of the extensions table. Sorts first by year,
801 * then by name.
802 *
803 * Arguments are indices into extension_table.
804 */
805 static int
806 extension_compare(const void *p1, const void *p2)
807 {
808 extension_index i1 = * (const extension_index *) p1;
809 extension_index i2 = * (const extension_index *) p2;
810 const struct extension *e1 = &extension_table[i1];
811 const struct extension *e2 = &extension_table[i2];
812 int res;
813
814 res = (int)e1->year - (int)e2->year;
815
816 if (res == 0) {
817 res = strcmp(e1->name, e2->name);
818 }
819
820 return res;
821 }
822
823
824 /**
825 * Construct the GL_EXTENSIONS string. Called the first time that
826 * glGetString(GL_EXTENSIONS) is called.
827 */
828 GLubyte*
829 _mesa_make_extension_string(struct gl_context *ctx)
830 {
831 /* The extension string. */
832 char *exts = 0;
833 /* Length of extension string. */
834 size_t length = 0;
835 /* Number of extensions */
836 unsigned count;
837 /* Indices of the extensions sorted by year */
838 extension_index *extension_indices;
839 /* String of extra extensions. */
840 char *extra_extensions = get_extension_override(ctx);
841 GLboolean *base = (GLboolean *) &ctx->Extensions;
842 const struct extension *i;
843 unsigned j;
844 unsigned maxYear = ~0;
845
846 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
847 {
848 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
849 if (env) {
850 maxYear = atoi(env);
851 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
852 maxYear);
853 }
854 }
855
856 /* Compute length of the extension string. */
857 count = 0;
858 for (i = extension_table; i->name != 0; ++i) {
859 if (base[i->offset] &&
860 i->year <= maxYear &&
861 (i->api_set & (1 << ctx->API))) {
862 length += strlen(i->name) + 1; /* +1 for space */
863 ++count;
864 }
865 }
866 if (extra_extensions != NULL)
867 length += 1 + strlen(extra_extensions); /* +1 for space */
868
869 exts = (char *) calloc(ALIGN(length + 1, 4), sizeof(char));
870 if (exts == NULL) {
871 free(extra_extensions);
872 return NULL;
873 }
874
875 extension_indices = malloc(count * sizeof(extension_index));
876 if (extension_indices == NULL) {
877 free(exts);
878 free(extra_extensions);
879 return NULL;
880 }
881
882 /* Sort extensions in chronological order because certain old applications (e.g.,
883 * Quake3 demo) store the extension list in a static size buffer so chronologically
884 * order ensure that the extensions that such applications expect will fit into
885 * that buffer.
886 */
887 j = 0;
888 for (i = extension_table; i->name != 0; ++i) {
889 if (base[i->offset] &&
890 i->year <= maxYear &&
891 (i->api_set & (1 << ctx->API))) {
892 extension_indices[j++] = i - extension_table;
893 }
894 }
895 assert(j == count);
896 qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
897
898 /* Build the extension string.*/
899 for (j = 0; j < count; ++j) {
900 i = &extension_table[extension_indices[j]];
901 assert(base[i->offset] && (i->api_set & (1 << ctx->API)));
902 strcat(exts, i->name);
903 strcat(exts, " ");
904 }
905 free(extension_indices);
906 if (extra_extensions != 0) {
907 strcat(exts, extra_extensions);
908 free(extra_extensions);
909 }
910
911 return (GLubyte *) exts;
912 }
913
914 /**
915 * Return number of enabled extensions.
916 */
917 GLuint
918 _mesa_get_extension_count(struct gl_context *ctx)
919 {
920 GLboolean *base;
921 const struct extension *i;
922
923 /* only count once */
924 if (ctx->Extensions.Count != 0)
925 return ctx->Extensions.Count;
926
927 base = (GLboolean *) &ctx->Extensions;
928 for (i = extension_table; i->name != 0; ++i) {
929 if (base[i->offset]) {
930 ctx->Extensions.Count++;
931 }
932 }
933 return ctx->Extensions.Count;
934 }
935
936 /**
937 * Return name of i-th enabled extension
938 */
939 const GLubyte *
940 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
941 {
942 const GLboolean *base;
943 size_t n;
944 const struct extension *i;
945
946 base = (GLboolean*) &ctx->Extensions;
947 n = 0;
948 for (i = extension_table; i->name != 0; ++i) {
949 if (n == index && base[i->offset]) {
950 return (const GLubyte*) i->name;
951 } else if (base[i->offset]) {
952 ++n;
953 }
954 }
955
956 return NULL;
957 }