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e5711f21aecf83dfdf29439cc03f03f993a6b020
[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 enum {
41 DISABLE = 0,
42 GL = 1 << API_OPENGL,
43 ES1 = 1 << API_OPENGLES,
44 ES2 = 1 << API_OPENGLES2,
45 };
46
47 /**
48 * \brief An element of the \c extension_table.
49 */
50 struct extension {
51 /** Name of extension, such as "GL_ARB_depth_clamp". */
52 const char *name;
53
54 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
55 size_t offset;
56
57 /** Set of API's in which the extension exists, as a bitset. */
58 uint8_t api_set;
59
60 /** Year the extension was proposed or approved. Used to sort the
61 * extension string chronologically. */
62 uint16_t year;
63 };
64
65
66 /**
67 * Given a member \c x of struct gl_extensions, return offset of
68 * \c x in bytes.
69 */
70 #define o(x) offsetof(struct gl_extensions, x)
71
72
73 /**
74 * \brief Table of supported OpenGL extensions for all API's.
75 *
76 * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions.
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_blend_func_extended", o(ARB_blend_func_extended), GL, 2009 },
82 { "GL_ARB_color_buffer_float", o(ARB_color_buffer_float), GL, 2004 },
83 { "GL_ARB_copy_buffer", o(ARB_copy_buffer), GL, 2008 },
84 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
85 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
86 { "GL_ARB_depth_texture", o(ARB_depth_texture), GL, 2001 },
87 { "GL_ARB_draw_buffers", o(ARB_draw_buffers), GL, 2002 },
88 { "GL_ARB_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
89 { "GL_ARB_draw_elements_base_vertex", o(ARB_draw_elements_base_vertex), GL, 2009 },
90 { "GL_ARB_draw_instanced", o(ARB_draw_instanced), GL, 2008 },
91 { "GL_ARB_explicit_attrib_location", o(ARB_explicit_attrib_location), GL, 2009 },
92 { "GL_ARB_fragment_coord_conventions", o(ARB_fragment_coord_conventions), GL, 2009 },
93 { "GL_ARB_fragment_program", o(ARB_fragment_program), GL, 2002 },
94 { "GL_ARB_fragment_program_shadow", o(ARB_fragment_program_shadow), GL, 2003 },
95 { "GL_ARB_fragment_shader", o(ARB_fragment_shader), GL, 2002 },
96 { "GL_ARB_framebuffer_object", o(ARB_framebuffer_object), GL, 2005 },
97 { "GL_ARB_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
98 { "GL_ARB_half_float_pixel", o(ARB_half_float_pixel), GL, 2003 },
99 { "GL_ARB_half_float_vertex", o(ARB_half_float_vertex), GL, 2008 },
100 { "GL_ARB_instanced_arrays", o(ARB_instanced_arrays), GL, 2008 },
101 { "GL_ARB_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
102 { "GL_ARB_multisample", o(ARB_multisample), GL, 1994 },
103 { "GL_ARB_multitexture", o(ARB_multitexture), GL, 1998 },
104 { "GL_ARB_occlusion_query2", o(ARB_occlusion_query2), GL, 2003 },
105 { "GL_ARB_occlusion_query", o(ARB_occlusion_query), GL, 2001 },
106 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
107 { "GL_ARB_point_parameters", o(EXT_point_parameters), GL, 1997 },
108 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
109 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
110 { "GL_ARB_sampler_objects", o(ARB_sampler_objects), GL, 2009 },
111 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
112 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 },
113 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
114 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GL, 2003 },
115 { "GL_ARB_shadow_ambient", o(ARB_shadow_ambient), GL, 2001 },
116 { "GL_ARB_shadow", o(ARB_shadow), GL, 2001 },
117 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
118 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GL, 2000 },
119 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 },
120 { "GL_ARB_texture_compression", o(ARB_texture_compression), GL, 2000 },
121 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
122 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GL, 1999 },
123 { "GL_ARB_texture_env_add", o(EXT_texture_env_add), GL, 1999 },
124 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GL, 2001 },
125 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GL, 2001 },
126 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GL, 2001 },
127 { "GL_ARB_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 2001 },
128 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
129 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
130 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
131 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
132 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
133 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
134 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
135 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GL, 1999 },
136 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2002 },
137 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
138 { "GL_ARB_vertex_array_object", o(ARB_vertex_array_object), GL, 2006 },
139 { "GL_ARB_vertex_buffer_object", o(ARB_vertex_buffer_object), GL, 2003 },
140 { "GL_ARB_vertex_program", o(ARB_vertex_program), GL, 2002 },
141 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
142 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
143 { "GL_ARB_window_pos", o(ARB_window_pos), GL, 2001 },
144
145 /* EXT extensions */
146 { "GL_EXT_abgr", o(EXT_abgr), GL, 1995 },
147 { "GL_EXT_bgra", o(EXT_bgra), GL, 1995 },
148 { "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 },
149 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
150 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
151 { "GL_EXT_blend_logic_op", o(EXT_blend_logic_op), GL, 1995 },
152 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 },
153 { "GL_EXT_blend_subtract", o(EXT_blend_subtract), GL, 1995 },
154 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
155 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GL, 1996 },
156 { "GL_EXT_copy_texture", o(EXT_copy_texture), GL, 1995 },
157 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
158 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
159 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
160 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GL, 1997 },
161 { "GL_EXT_fog_coord", o(EXT_fog_coord), GL, 1999 },
162 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 },
163 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
164 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 },
165 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
166 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GL, 2006 },
167 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
168 { "GL_EXT_multi_draw_arrays", o(EXT_multi_draw_arrays), GL | ES1 | ES2, 1999 },
169 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 },
170 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
171 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GL, 1997 },
172 { "GL_EXT_paletted_texture", o(EXT_paletted_texture), GL, 1995 },
173 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
174 { "GL_EXT_point_parameters", o(EXT_point_parameters), GL, 1997 },
175 { "GL_EXT_polygon_offset", o(EXT_polygon_offset), GL, 1995 },
176 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
177 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GL, 1997 },
178 { "GL_EXT_secondary_color", o(EXT_secondary_color), GL, 1999 },
179 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GL, 2008 },
180 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GL, 1997 },
181 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GL, 2002 },
182 { "GL_EXT_shared_texture_palette", o(EXT_shared_texture_palette), GL, 2000 },
183 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GL, 2001 },
184 { "GL_EXT_stencil_wrap", o(EXT_stencil_wrap), GL, 2002 },
185 { "GL_EXT_subtexture", o(EXT_subtexture), GL, 1995 },
186 { "GL_EXT_texture3D", o(EXT_texture3D), GL, 1996 },
187 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
188 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 },
189 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
190 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
191 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
192 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GL, 2001 },
193 { "GL_EXT_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 },
194 { "GL_EXT_texture_env_add", o(EXT_texture_env_add), GL, 1999 },
195 { "GL_EXT_texture_env_combine", o(EXT_texture_env_combine), GL, 2006 },
196 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GL, 2000 },
197 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
198 { "GL_EXT_texture_format_BGRA8888", o(EXT_texture_format_BGRA8888), ES1 | ES2, 2009 },
199 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
200 { "GL_EXT_texture_lod_bias", o(EXT_texture_lod_bias), GL | ES1, 1999 },
201 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
202 { "GL_EXT_texture_object", o(EXT_texture_object), GL, 1995 },
203 { "GL_EXT_texture", o(EXT_texture), GL, 1996 },
204 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
205 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
206 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
207 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
208 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
209 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
210 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
211 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
212 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
213 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
214 { "GL_EXT_vertex_array", o(EXT_vertex_array), GL, 1995 },
215 { "GL_EXT_vertex_array_set", o(EXT_vertex_array_set), GL, 1997 },
216
217 /* OES extensions */
218 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
219 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
220 { "GL_OES_blend_subtract", o(EXT_blend_subtract), ES1, 2009 },
221 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
222 { "GL_OES_compressed_paletted_texture", o(dummy_false), DISABLE, 2003 },
223 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
224 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
225 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
226 #if FEATURE_OES_draw_texture
227 { "GL_OES_draw_texture", o(OES_draw_texture), ES1 | ES2, 2004 },
228 #endif
229 #if FEATURE_OES_EGL_image
230 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
231 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
232 #endif
233 { "GL_OES_element_index_uint", o(EXT_vertex_array), ES1 | ES2, 2005 },
234 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
235 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
236 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 },
237 { "GL_OES_mapbuffer", o(ARB_vertex_buffer_object), ES1 | ES2, 2005 },
238 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 },
239 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 },
240 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
241 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
242 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
243 { "GL_OES_read_format", o(OES_read_format), GL | ES1, 2003 },
244 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
245 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
246 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
247 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
248 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
249 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
250 { "GL_OES_stencil_wrap", o(EXT_stencil_wrap), ES1, 2002 },
251 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
252 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
253 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
254 { "GL_OES_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), ES1, 2005 },
255 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 },
256
257 /* Vendor extensions */
258 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
259 { "GL_AMD_conservative_depth", o(AMD_conservative_depth), GL, 2009 },
260 { "GL_APPLE_client_storage", o(APPLE_client_storage), GL, 2002 },
261 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
262 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GL, 2002 },
263 { "GL_APPLE_vertex_array_object", o(APPLE_vertex_array_object), GL, 2002 },
264 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
265 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GL, 2001 },
266 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GL, 2001 },
267 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GL, 2006 },
268 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
269 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GL, 2002 },
270 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
271 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 },
272 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 },
273 { "GL_IBM_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 1998 },
274 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
275 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
276 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 },
277 { "GL_MESA_texture_array", o(MESA_texture_array), GL, 2007 },
278 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
279 { "GL_MESA_window_pos", o(ARB_window_pos), GL, 2000 },
280 { "GL_MESAX_texture_float", o(ARB_texture_float), GL, 2009 },
281 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
282 { "GL_NV_blend_square", o(NV_blend_square), GL, 1999 },
283 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
284 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
285 { "GL_NV_fragment_program", o(NV_fragment_program), GL, 2001 },
286 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GL, 2005 },
287 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GL, 1999 },
288 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 },
289 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
290 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 },
291 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GL, 1999 },
292 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
293 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GL, 1999 },
294 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GL, 2000 },
295 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GL, 2001 },
296 { "GL_NV_vertex_program", o(NV_vertex_program), GL, 2000 },
297 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 },
298 { "GL_SGIS_generate_mipmap", o(SGIS_generate_mipmap), GL, 1997 },
299 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GL, 1997 },
300 { "GL_SGIS_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 },
301 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GL, 1997 },
302 { "GL_SUN_multi_draw_arrays", o(EXT_multi_draw_arrays), GL, 1999 },
303
304 { 0, 0, 0, 0 },
305 };
306
307
308 /**
309 * Given an extension name, lookup up the corresponding member of struct
310 * gl_extensions and return that member's offset (in bytes). If the name is
311 * not found in the \c extension_table, return 0.
312 *
313 * \param name Name of extension.
314 * \return Offset of member in struct gl_extensions.
315 */
316 static size_t
317 name_to_offset(const char* name)
318 {
319 const struct extension *i;
320
321 if (name == 0)
322 return 0;
323
324 for (i = extension_table; i->name != 0; ++i) {
325 if (strcmp(name, i->name) == 0)
326 return i->offset;
327 }
328
329 return 0;
330 }
331
332
333 /**
334 * \brief Extensions enabled by default.
335 *
336 * These extensions are enabled by _mesa_init_extensions().
337 *
338 * XXX: Should these defaults also apply to GLES?
339 */
340 static const size_t default_extensions[] = {
341 o(ARB_copy_buffer),
342 o(ARB_draw_buffers),
343 o(ARB_multisample),
344 o(ARB_texture_compression),
345 o(ARB_transpose_matrix),
346 o(ARB_vertex_buffer_object),
347 o(ARB_window_pos),
348
349 o(EXT_abgr),
350 o(EXT_bgra),
351 o(EXT_compiled_vertex_array),
352 o(EXT_copy_texture),
353 o(EXT_draw_range_elements),
354 o(EXT_multi_draw_arrays),
355 o(EXT_packed_pixels),
356 o(EXT_polygon_offset),
357 o(EXT_rescale_normal),
358 o(EXT_separate_specular_color),
359 o(EXT_subtexture),
360 o(EXT_texture),
361 o(EXT_texture3D),
362 o(EXT_texture_object),
363 o(EXT_vertex_array),
364
365 o(OES_read_format),
366 o(OES_standard_derivatives),
367
368 /* Vendor Extensions */
369 o(APPLE_packed_pixels),
370 o(IBM_multimode_draw_arrays),
371 o(IBM_rasterpos_clip),
372 o(NV_light_max_exponent),
373 o(NV_texgen_reflection),
374 o(SGIS_generate_mipmap),
375 o(SGIS_texture_edge_clamp),
376 o(SGIS_texture_lod),
377
378 0,
379 };
380
381
382 /**
383 * Enable all extensions suitable for a software-only renderer.
384 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
385 */
386 void
387 _mesa_enable_sw_extensions(struct gl_context *ctx)
388 {
389 /*ctx->Extensions.ARB_copy_buffer = GL_TRUE;*/
390 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
391 ctx->Extensions.ARB_depth_texture = GL_TRUE;
392 /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
393 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
394 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
395 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
396 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
397 #if FEATURE_ARB_fragment_program
398 ctx->Extensions.ARB_fragment_program = GL_TRUE;
399 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
400 #endif
401 #if FEATURE_ARB_fragment_shader
402 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
403 #endif
404 #if FEATURE_ARB_framebuffer_object
405 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
406 #endif
407 #if FEATURE_ARB_geometry_shader4 && 0
408 /* XXX re-enable when GLSL compiler again supports geometry shaders */
409 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
410 #endif
411 ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
412 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
413 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
414 ctx->Extensions.ARB_multitexture = 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_mirrored_repeat = 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_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_vertex_buffer_object
447 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
448 #endif
449 #if FEATURE_ARB_sync
450 ctx->Extensions.ARB_sync = GL_TRUE;
451 #endif
452 ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
453 #if FEATURE_APPLE_object_purgeable
454 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
455 #endif
456 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
457 #if FEATURE_ATI_fragment_shader
458 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
459 #endif
460 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
461 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
462 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
463 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
464 ctx->Extensions.EXT_blend_color = GL_TRUE;
465 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
466 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
467 ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
468 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
469 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
470 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
471 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
472 ctx->Extensions.EXT_fog_coord = GL_TRUE;
473 #if FEATURE_EXT_framebuffer_object
474 ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
475 #endif
476 #if FEATURE_EXT_framebuffer_blit
477 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
478 #endif
479 #if FEATURE_ARB_framebuffer_object
480 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
481 #endif
482 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
483 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
484 ctx->Extensions.EXT_paletted_texture = GL_TRUE;
485 #if FEATURE_EXT_pixel_buffer_object
486 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
487 #endif
488 ctx->Extensions.EXT_point_parameters = GL_TRUE;
489 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
490 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
491 ctx->Extensions.EXT_secondary_color = GL_TRUE;
492 ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
493 ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
494 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
495 ctx->Extensions.EXT_texture_array = GL_TRUE;
496 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
497 ctx->Extensions.EXT_texture_env_add = GL_TRUE;
498 ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
499 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
500 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
501 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
502 #if FEATURE_EXT_texture_sRGB
503 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
504 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
505 #endif
506 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
507 #if FEATURE_EXT_transform_feedback
508 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
509 #endif
510 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
511 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
512 ctx->Extensions.MESA_pack_invert = GL_TRUE;
513 ctx->Extensions.MESA_resize_buffers = GL_TRUE;
514 ctx->Extensions.MESA_texture_array = GL_TRUE;
515 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
516 ctx->Extensions.NV_blend_square = GL_TRUE;
517 ctx->Extensions.NV_conditional_render = GL_TRUE;
518 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
519 ctx->Extensions.NV_point_sprite = GL_TRUE;
520 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
521 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
522 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
523 #if FEATURE_NV_vertex_program
524 ctx->Extensions.NV_vertex_program = GL_TRUE;
525 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
526 #endif
527 #if FEATURE_NV_fragment_program
528 ctx->Extensions.NV_fragment_program = GL_TRUE;
529 #endif
530 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
531 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
532 #endif
533 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/
534 ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
535 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
536 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
537 #endif
538 #if FEATURE_texture_fxt1
539 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
540 #endif
541 #if FEATURE_texture_s3tc
542 if (ctx->Mesa_DXTn) {
543 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
544 _mesa_enable_extension(ctx, "GL_S3_s3tc");
545 }
546 #endif
547 }
548
549
550 /**
551 * Enable common EXT extensions in the ARB_imaging subset.
552 */
553 void
554 _mesa_enable_imaging_extensions(struct gl_context *ctx)
555 {
556 ctx->Extensions.EXT_blend_color = GL_TRUE;
557 ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
558 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
559 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
560 }
561
562
563
564 /**
565 * Enable all OpenGL 1.3 features and extensions.
566 * A convenience function to be called by drivers.
567 */
568 void
569 _mesa_enable_1_3_extensions(struct gl_context *ctx)
570 {
571 /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
572 ctx->Extensions.ARB_multitexture = GL_TRUE;
573 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
574 /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
575 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
576 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
577 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
578 ctx->Extensions.EXT_texture_env_add = GL_TRUE;
579 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
580 }
581
582
583
584 /**
585 * Enable all OpenGL 1.4 features and extensions.
586 * A convenience function to be called by drivers.
587 */
588 void
589 _mesa_enable_1_4_extensions(struct gl_context *ctx)
590 {
591 ctx->Extensions.ARB_depth_texture = GL_TRUE;
592 ctx->Extensions.ARB_shadow = GL_TRUE;
593 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
594 ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
595 ctx->Extensions.ARB_window_pos = GL_TRUE;
596 ctx->Extensions.EXT_blend_color = GL_TRUE;
597 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
598 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
599 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
600 ctx->Extensions.EXT_fog_coord = GL_TRUE;
601 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
602 ctx->Extensions.EXT_point_parameters = GL_TRUE;
603 ctx->Extensions.EXT_secondary_color = GL_TRUE;
604 ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
605 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
606 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/
607 }
608
609
610 /**
611 * Enable all OpenGL 1.5 features and extensions.
612 * A convenience function to be called by drivers.
613 */
614 void
615 _mesa_enable_1_5_extensions(struct gl_context *ctx)
616 {
617 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
618 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
619 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
620 }
621
622
623 /**
624 * Enable all OpenGL 2.0 features and extensions.
625 * A convenience function to be called by drivers.
626 */
627 void
628 _mesa_enable_2_0_extensions(struct gl_context *ctx)
629 {
630 /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
631 #if FEATURE_ARB_fragment_shader
632 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
633 #endif
634 ctx->Extensions.ARB_point_sprite = GL_TRUE;
635 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
636 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
637 #if FEATURE_ARB_shader_objects
638 ctx->Extensions.ARB_shader_objects = GL_TRUE;
639 #endif
640 #if FEATURE_ARB_shading_language_100
641 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
642 #endif
643 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
644 #if FEATURE_ARB_vertex_shader
645 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
646 #endif
647 }
648
649
650 /**
651 * Enable all OpenGL 2.1 features and extensions.
652 * A convenience function to be called by drivers.
653 */
654 void
655 _mesa_enable_2_1_extensions(struct gl_context *ctx)
656 {
657 #if FEATURE_EXT_pixel_buffer_object
658 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
659 #endif
660 #if FEATURE_EXT_texture_sRGB
661 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
662 #endif
663 }
664
665
666 /**
667 * Either enable or disable the named extension.
668 * \return GL_TRUE for success, GL_FALSE if invalid extension name
669 */
670 static GLboolean
671 set_extension( struct gl_context *ctx, const char *name, GLboolean state )
672 {
673 size_t offset;
674
675 if (ctx->Extensions.String) {
676 /* The string was already queried - can't change it now! */
677 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
678 return GL_FALSE;
679 }
680
681 offset = name_to_offset(name);
682 if (offset == 0) {
683 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
684 name);
685 return GL_FALSE;
686 } else if (offset == o(dummy_true) && state == GL_FALSE) {
687 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
688 "%s", name);
689 return GL_FALSE;
690 } else {
691 GLboolean *base = (GLboolean *) &ctx->Extensions;
692 base[offset] = state;
693 return GL_TRUE;
694 }
695 }
696
697
698 /**
699 * Enable the named extension.
700 * Typically called by drivers.
701 */
702 void
703 _mesa_enable_extension( struct gl_context *ctx, const char *name )
704 {
705 if (!set_extension(ctx, name, GL_TRUE))
706 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
707 }
708
709
710 /**
711 * Disable the named extension.
712 * XXX is this really needed???
713 */
714 void
715 _mesa_disable_extension( struct gl_context *ctx, const char *name )
716 {
717 if (!set_extension(ctx, name, GL_FALSE))
718 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
719 }
720
721
722 /**
723 * Test if the named extension is enabled in this context.
724 */
725 GLboolean
726 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
727 {
728 size_t offset;
729 GLboolean *base;
730
731 if (name == 0)
732 return GL_FALSE;
733
734 offset = name_to_offset(name);
735 if (offset == 0)
736 return GL_FALSE;
737 base = (GLboolean *) &ctx->Extensions;
738 return base[offset];
739 }
740
741
742 /**
743 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
744 *
745 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
746 * enable or disable. The list is processed thus:
747 * - Enable recognized extension names that are prefixed with '+'.
748 * - Disable recognized extension names that are prefixed with '-'.
749 * - Enable recognized extension names that are not prefixed.
750 * - Collect unrecognized extension names in a new string.
751 *
752 * \return Space-separated list of unrecognized extension names (which must
753 * be freed). Does not return \c NULL.
754 */
755 static char *
756 get_extension_override( struct gl_context *ctx )
757 {
758 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
759 char *env;
760 char *ext;
761 char *extra_exts;
762 int len;
763
764 if (env_const == NULL) {
765 /* Return the empty string rather than NULL. This simplifies the logic
766 * of client functions. */
767 return calloc(1, sizeof(char));
768 }
769
770 /* extra_exts: List of unrecognized extensions. */
771 extra_exts = calloc(strlen(env_const), sizeof(char));
772
773 /* Copy env_const because strtok() is destructive. */
774 env = strdup(env_const);
775 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
776 int enable;
777 int recognized;
778 switch (ext[0]) {
779 case '+':
780 enable = 1;
781 ++ext;
782 break;
783 case '-':
784 enable = 0;
785 ++ext;
786 break;
787 default:
788 enable = 1;
789 break;
790 }
791 recognized = set_extension(ctx, ext, enable);
792 if (!recognized) {
793 strcat(extra_exts, ext);
794 strcat(extra_exts, " ");
795 }
796 }
797
798 /* Remove trailing space. */
799 len = strlen(extra_exts);
800 if (extra_exts[len - 1] == ' ')
801 extra_exts[len - 1] = '\0';
802
803 return extra_exts;
804 }
805
806
807 /**
808 * \brief Initialize extension tables and enable default extensions.
809 *
810 * This should be called during context initialization.
811 * Note: Sets gl_extensions.dummy_true to true.
812 */
813 void
814 _mesa_init_extensions( struct gl_context *ctx )
815 {
816 GLboolean *base = (GLboolean *) &ctx->Extensions;
817 GLboolean *sentinel = base + o(extension_sentinel);
818 GLboolean *i;
819 const size_t *j;
820
821 /* First, turn all extensions off. */
822 for (i = base; i != sentinel; ++i)
823 *i = GL_FALSE;
824
825 /* Then, selectively turn default extensions on. */
826 ctx->Extensions.dummy_true = GL_TRUE;
827 for (j = default_extensions; *j != 0; ++j)
828 base[*j] = GL_TRUE;
829 }
830
831
832 typedef unsigned short extension_index;
833
834
835 /**
836 * Compare two entries of the extensions table. Sorts first by year,
837 * then by name.
838 *
839 * Arguments are indices into extension_table.
840 */
841 static int
842 extension_compare(const void *p1, const void *p2)
843 {
844 extension_index i1 = * (const extension_index *) p1;
845 extension_index i2 = * (const extension_index *) p2;
846 const struct extension *e1 = &extension_table[i1];
847 const struct extension *e2 = &extension_table[i2];
848 int res;
849
850 res = (int)e1->year - (int)e2->year;
851
852 if (res == 0) {
853 res = strcmp(e1->name, e2->name);
854 }
855
856 return res;
857 }
858
859
860 /**
861 * Construct the GL_EXTENSIONS string. Called the first time that
862 * glGetString(GL_EXTENSIONS) is called.
863 */
864 GLubyte*
865 _mesa_make_extension_string(struct gl_context *ctx)
866 {
867 /* The extension string. */
868 char *exts = 0;
869 /* Length of extension string. */
870 size_t length = 0;
871 /* Number of extensions */
872 unsigned count;
873 /* Indices of the extensions sorted by year */
874 extension_index *extension_indices;
875 /* String of extra extensions. */
876 char *extra_extensions = get_extension_override(ctx);
877 GLboolean *base = (GLboolean *) &ctx->Extensions;
878 const struct extension *i;
879 unsigned j;
880 unsigned maxYear = ~0;
881
882 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
883 {
884 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
885 if (env) {
886 maxYear = atoi(env);
887 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
888 maxYear);
889 }
890 }
891
892 /* Compute length of the extension string. */
893 count = 0;
894 for (i = extension_table; i->name != 0; ++i) {
895 if (base[i->offset] &&
896 i->year <= maxYear &&
897 (i->api_set & (1 << ctx->API))) {
898 length += strlen(i->name) + 1; /* +1 for space */
899 ++count;
900 }
901 }
902 if (extra_extensions != NULL)
903 length += 1 + strlen(extra_extensions); /* +1 for space */
904
905 exts = (char *) calloc(length + 1, sizeof(char));
906 if (exts == NULL) {
907 free(extra_extensions);
908 return NULL;
909 }
910
911 extension_indices = malloc(count * sizeof(extension_index));
912 if (extension_indices == NULL) {
913 free(exts);
914 free(extra_extensions);
915 return NULL;
916 }
917
918 /* Sort extensions in chronological order because certain old applications (e.g.,
919 * Quake3 demo) store the extension list in a static size buffer so chronologically
920 * order ensure that the extensions that such applications expect will fit into
921 * that buffer.
922 */
923 j = 0;
924 for (i = extension_table; i->name != 0; ++i) {
925 if (base[i->offset] &&
926 i->year <= maxYear &&
927 (i->api_set & (1 << ctx->API))) {
928 extension_indices[j++] = i - extension_table;
929 }
930 }
931 assert(j == count);
932 qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
933
934 /* Build the extension string.*/
935 for (j = 0; j < count; ++j) {
936 i = &extension_table[extension_indices[j]];
937 assert(base[i->offset] && (i->api_set & (1 << ctx->API)));
938 strcat(exts, i->name);
939 strcat(exts, " ");
940 }
941 free(extension_indices);
942 if (extra_extensions != 0) {
943 strcat(exts, extra_extensions);
944 free(extra_extensions);
945 }
946
947 return (GLubyte *) exts;
948 }
949
950 /**
951 * Return number of enabled extensions.
952 */
953 GLuint
954 _mesa_get_extension_count(struct gl_context *ctx)
955 {
956 GLboolean *base;
957 const struct extension *i;
958
959 /* only count once */
960 if (ctx->Extensions.Count != 0)
961 return ctx->Extensions.Count;
962
963 base = (GLboolean *) &ctx->Extensions;
964 for (i = extension_table; i->name != 0; ++i) {
965 if (base[i->offset]) {
966 ctx->Extensions.Count++;
967 }
968 }
969 return ctx->Extensions.Count;
970 }
971
972 /**
973 * Return name of i-th enabled extension
974 */
975 const GLubyte *
976 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
977 {
978 const GLboolean *base;
979 size_t n;
980 const struct extension *i;
981
982 if (index < 0)
983 return NULL;
984
985 base = (GLboolean*) &ctx->Extensions;
986 n = 0;
987 for (i = extension_table; i->name != 0; ++i) {
988 if (n == index && base[i->offset]) {
989 return (GLubyte*) i->name;
990 } else if (base[i->offset]) {
991 ++n;
992 }
993 }
994
995 return NULL;
996 }