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mesa: implement AMD_seamless_cubemap_per_texture
[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_robustness", o(dummy_true), GL, 2010 },
111 { "GL_ARB_sampler_objects", o(ARB_sampler_objects), GL, 2009 },
112 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
113 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 },
114 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
115 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GL, 2003 },
116 { "GL_ARB_shadow_ambient", o(ARB_shadow_ambient), GL, 2001 },
117 { "GL_ARB_shadow", o(ARB_shadow), GL, 2001 },
118 { "GL_ARB_sync", o(ARB_sync), GL, 2003 },
119 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GL, 2000 },
120 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 },
121 { "GL_ARB_texture_compression", o(ARB_texture_compression), GL, 2000 },
122 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
123 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GL, 1999 },
124 { "GL_ARB_texture_env_add", o(EXT_texture_env_add), GL, 1999 },
125 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GL, 2001 },
126 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GL, 2001 },
127 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GL, 2001 },
128 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
129 { "GL_ARB_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 2001 },
130 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
131 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
132 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
133 { "GL_ARB_texture_rgb10_a2ui", o(ARB_texture_rgb10_a2ui), GL, 2009 },
134 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
135 { "GL_ARB_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
136 { "GL_ARB_transform_feedback2", o(ARB_transform_feedback2), GL, 2010 },
137 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GL, 1999 },
138 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2002 },
139 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
140 { "GL_ARB_vertex_array_object", o(ARB_vertex_array_object), GL, 2006 },
141 { "GL_ARB_vertex_buffer_object", o(ARB_vertex_buffer_object), GL, 2003 },
142 { "GL_ARB_vertex_program", o(ARB_vertex_program), GL, 2002 },
143 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
144 { "GL_ARB_vertex_type_2_10_10_10_rev", o(ARB_vertex_type_2_10_10_10_rev), GL, 2009 },
145 { "GL_ARB_window_pos", o(ARB_window_pos), GL, 2001 },
146
147 /* EXT extensions */
148 { "GL_EXT_abgr", o(EXT_abgr), GL, 1995 },
149 { "GL_EXT_bgra", o(EXT_bgra), GL, 1995 },
150 { "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 },
151 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
152 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
153 { "GL_EXT_blend_logic_op", o(EXT_blend_logic_op), GL, 1995 },
154 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 },
155 { "GL_EXT_blend_subtract", o(EXT_blend_subtract), GL, 1995 },
156 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
157 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GL, 1996 },
158 { "GL_EXT_copy_texture", o(EXT_copy_texture), GL, 1995 },
159 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
160 { "GL_EXT_draw_buffers2", o(EXT_draw_buffers2), GL, 2006 },
161 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
162 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GL, 1997 },
163 { "GL_EXT_fog_coord", o(EXT_fog_coord), GL, 1999 },
164 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 },
165 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
166 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 },
167 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
168 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GL, 2006 },
169 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
170 { "GL_EXT_multi_draw_arrays", o(EXT_multi_draw_arrays), GL | ES1 | ES2, 1999 },
171 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 },
172 { "GL_EXT_packed_float", o(EXT_packed_float), GL, 2004 },
173 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GL, 1997 },
174 { "GL_EXT_paletted_texture", o(EXT_paletted_texture), GL, 1995 },
175 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
176 { "GL_EXT_point_parameters", o(EXT_point_parameters), GL, 1997 },
177 { "GL_EXT_polygon_offset", o(EXT_polygon_offset), GL, 1995 },
178 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
179 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GL, 1997 },
180 { "GL_EXT_secondary_color", o(EXT_secondary_color), GL, 1999 },
181 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GL, 2008 },
182 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GL, 1997 },
183 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GL, 2002 },
184 { "GL_EXT_shared_texture_palette", o(EXT_shared_texture_palette), GL, 2000 },
185 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GL, 2001 },
186 { "GL_EXT_stencil_wrap", o(EXT_stencil_wrap), GL, 2002 },
187 { "GL_EXT_subtexture", o(EXT_subtexture), GL, 1995 },
188 { "GL_EXT_texture3D", o(EXT_texture3D), GL, 1996 },
189 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
190 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 },
191 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
192 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
193 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
194 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GL, 2001 },
195 { "GL_EXT_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 },
196 { "GL_EXT_texture_env_add", o(EXT_texture_env_add), GL, 1999 },
197 { "GL_EXT_texture_env_combine", o(EXT_texture_env_combine), GL, 2006 },
198 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GL, 2000 },
199 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
200 { "GL_EXT_texture_format_BGRA8888", o(EXT_texture_format_BGRA8888), ES1 | ES2, 2009 },
201 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
202 { "GL_EXT_texture_lod_bias", o(EXT_texture_lod_bias), GL | ES1, 1999 },
203 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
204 { "GL_EXT_texture_object", o(EXT_texture_object), GL, 1995 },
205 { "GL_EXT_texture", o(EXT_texture), GL, 1996 },
206 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
207 { "GL_EXT_texture_shared_exponent", o(EXT_texture_shared_exponent), GL, 2004 },
208 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
209 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
210 { "GL_EXT_texture_sRGB_decode", o(EXT_texture_sRGB_decode), GL, 2006 },
211 { "GL_EXT_texture_swizzle", o(EXT_texture_swizzle), GL, 2008 },
212 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
213 { "GL_EXT_timer_query", o(EXT_timer_query), GL, 2006 },
214 { "GL_EXT_transform_feedback", o(EXT_transform_feedback), GL, 2011 },
215 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
216 { "GL_EXT_vertex_array", o(EXT_vertex_array), GL, 1995 },
217 { "GL_EXT_vertex_array_set", o(EXT_vertex_array_set), GL, 1997 },
218
219 /* OES extensions */
220 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
221 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
222 { "GL_OES_blend_subtract", o(EXT_blend_subtract), ES1, 2009 },
223 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
224 { "GL_OES_compressed_paletted_texture", o(dummy_false), DISABLE, 2003 },
225 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
226 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
227 { "GL_OES_depth_texture", o(ARB_depth_texture), ES2, 2006 },
228 #if FEATURE_OES_draw_texture
229 { "GL_OES_draw_texture", o(OES_draw_texture), ES1 | ES2, 2004 },
230 #endif
231 #if FEATURE_OES_EGL_image
232 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
233 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
234 #endif
235 { "GL_OES_element_index_uint", o(EXT_vertex_array), ES1 | ES2, 2005 },
236 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
237 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
238 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 },
239 { "GL_OES_mapbuffer", o(ARB_vertex_buffer_object), ES1 | ES2, 2005 },
240 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 },
241 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 },
242 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
243 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
244 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
245 { "GL_OES_read_format", o(OES_read_format), GL | ES1, 2003 },
246 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
247 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
248 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
249 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
250 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
251 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
252 { "GL_OES_stencil_wrap", o(EXT_stencil_wrap), ES1, 2002 },
253 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
254 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
255 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
256 { "GL_OES_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), ES1, 2005 },
257 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 },
258
259 /* Vendor extensions */
260 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
261 { "GL_AMD_conservative_depth", o(AMD_conservative_depth), GL, 2009 },
262 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
263 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
264 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
265 { "GL_APPLE_client_storage", o(APPLE_client_storage), GL, 2002 },
266 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
267 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GL, 2002 },
268 { "GL_APPLE_vertex_array_object", o(APPLE_vertex_array_object), GL, 2002 },
269 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
270 { "GL_ATI_draw_buffers", o(ARB_draw_buffers), GL, 2002 },
271 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GL, 2001 },
272 { "GL_ATI_fragment_shader", o(ATI_fragment_shader), GL, 2001 },
273 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GL, 2006 },
274 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
275 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GL, 2002 },
276 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
277 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
278 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 },
279 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 },
280 { "GL_IBM_texture_mirrored_repeat", o(ARB_texture_mirrored_repeat), GL, 1998 },
281 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
282 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
283 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 },
284 { "GL_MESA_texture_array", o(MESA_texture_array), GL, 2007 },
285 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
286 { "GL_MESA_window_pos", o(ARB_window_pos), GL, 2000 },
287 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
288 { "GL_NV_blend_square", o(NV_blend_square), GL, 1999 },
289 { "GL_NV_conditional_render", o(NV_conditional_render), GL, 2008 },
290 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
291 { "GL_NV_fragment_program", o(NV_fragment_program), GL, 2001 },
292 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GL, 2005 },
293 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GL, 1999 },
294 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 },
295 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
296 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 },
297 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GL, 1999 },
298 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
299 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GL, 1999 },
300 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GL, 2000 },
301 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GL, 2001 },
302 { "GL_NV_vertex_program", o(NV_vertex_program), GL, 2000 },
303 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 },
304 { "GL_SGIS_generate_mipmap", o(SGIS_generate_mipmap), GL, 1997 },
305 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GL, 1997 },
306 { "GL_SGIS_texture_edge_clamp", o(SGIS_texture_edge_clamp), GL, 1997 },
307 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GL, 1997 },
308 { "GL_SUN_multi_draw_arrays", o(EXT_multi_draw_arrays), GL, 1999 },
309
310 { 0, 0, 0, 0 },
311 };
312
313
314 /**
315 * Given an extension name, lookup up the corresponding member of struct
316 * gl_extensions and return that member's offset (in bytes). If the name is
317 * not found in the \c extension_table, return 0.
318 *
319 * \param name Name of extension.
320 * \return Offset of member in struct gl_extensions.
321 */
322 static size_t
323 name_to_offset(const char* name)
324 {
325 const struct extension *i;
326
327 if (name == 0)
328 return 0;
329
330 for (i = extension_table; i->name != 0; ++i) {
331 if (strcmp(name, i->name) == 0)
332 return i->offset;
333 }
334
335 return 0;
336 }
337
338
339 /**
340 * \brief Extensions enabled by default.
341 *
342 * These extensions are enabled by _mesa_init_extensions().
343 *
344 * XXX: Should these defaults also apply to GLES?
345 */
346 static const size_t default_extensions[] = {
347 o(ARB_copy_buffer),
348 o(ARB_draw_buffers),
349 o(ARB_multisample),
350 o(ARB_texture_compression),
351 o(ARB_transpose_matrix),
352 o(ARB_vertex_buffer_object),
353 o(ARB_window_pos),
354
355 o(EXT_abgr),
356 o(EXT_bgra),
357 o(EXT_compiled_vertex_array),
358 o(EXT_copy_texture),
359 o(EXT_draw_range_elements),
360 o(EXT_multi_draw_arrays),
361 o(EXT_packed_pixels),
362 o(EXT_polygon_offset),
363 o(EXT_rescale_normal),
364 o(EXT_separate_specular_color),
365 o(EXT_subtexture),
366 o(EXT_texture),
367 o(EXT_texture3D),
368 o(EXT_texture_object),
369 o(EXT_vertex_array),
370
371 o(OES_read_format),
372 o(OES_standard_derivatives),
373
374 /* Vendor Extensions */
375 o(APPLE_packed_pixels),
376 o(IBM_multimode_draw_arrays),
377 o(IBM_rasterpos_clip),
378 o(NV_light_max_exponent),
379 o(NV_texgen_reflection),
380 o(SGIS_generate_mipmap),
381 o(SGIS_texture_edge_clamp),
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_buffers = GL_TRUE;*/
399 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
400 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
401 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
402 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
403 #if FEATURE_ARB_fragment_program
404 ctx->Extensions.ARB_fragment_program = GL_TRUE;
405 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
406 #endif
407 #if FEATURE_ARB_fragment_shader
408 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
409 #endif
410 #if FEATURE_ARB_framebuffer_object
411 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
412 #endif
413 #if FEATURE_ARB_geometry_shader4 && 0
414 /* XXX re-enable when GLSL compiler again supports geometry shaders */
415 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
416 #endif
417 ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
418 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
419 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
420 ctx->Extensions.ARB_multitexture = GL_TRUE;
421 #if FEATURE_queryobj
422 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
423 ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
424 #endif
425 ctx->Extensions.ARB_point_sprite = GL_TRUE;
426 #if FEATURE_ARB_shader_objects
427 ctx->Extensions.ARB_shader_objects = GL_TRUE;
428 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
429 #endif
430 #if FEATURE_ARB_shading_language_100
431 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
432 #endif
433 ctx->Extensions.ARB_shadow = GL_TRUE;
434 ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
435 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
436 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
437 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
438 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
439 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
440 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
441 ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
442 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
443 ctx->Extensions.ARB_texture_rg = GL_TRUE;
444 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
445 ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
446 #if FEATURE_ARB_vertex_program
447 ctx->Extensions.ARB_vertex_program = GL_TRUE;
448 #endif
449 #if FEATURE_ARB_vertex_shader
450 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
451 #endif
452 #if FEATURE_ARB_vertex_buffer_object
453 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
454 #endif
455 #if FEATURE_ARB_sync
456 ctx->Extensions.ARB_sync = GL_TRUE;
457 #endif
458 ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
459 #if FEATURE_APPLE_object_purgeable
460 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
461 #endif
462 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
463 #if FEATURE_ATI_fragment_shader
464 ctx->Extensions.ATI_fragment_shader = GL_TRUE;
465 #endif
466 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
467 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
468 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
469 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
470 ctx->Extensions.EXT_blend_color = GL_TRUE;
471 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
472 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
473 ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
474 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
475 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
476 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
477 ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
478 ctx->Extensions.EXT_fog_coord = GL_TRUE;
479 #if FEATURE_EXT_framebuffer_object
480 ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
481 #endif
482 #if FEATURE_EXT_framebuffer_blit
483 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
484 #endif
485 #if FEATURE_ARB_framebuffer_object
486 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
487 #endif
488 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
489 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
490 ctx->Extensions.EXT_paletted_texture = GL_TRUE;
491 #if FEATURE_EXT_pixel_buffer_object
492 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
493 #endif
494 ctx->Extensions.EXT_point_parameters = GL_TRUE;
495 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
496 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
497 ctx->Extensions.EXT_secondary_color = GL_TRUE;
498 ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
499 ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
500 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
501 ctx->Extensions.EXT_texture_array = GL_TRUE;
502 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
503 ctx->Extensions.EXT_texture_env_add = GL_TRUE;
504 ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
505 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
506 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
507 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
508 ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
509 #if FEATURE_EXT_texture_sRGB
510 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
511 ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
512 #endif
513 ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
514 #if FEATURE_EXT_transform_feedback
515 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
516 #endif
517 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
518 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
519 ctx->Extensions.MESA_pack_invert = GL_TRUE;
520 ctx->Extensions.MESA_resize_buffers = GL_TRUE;
521 ctx->Extensions.MESA_texture_array = GL_TRUE;
522 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
523 ctx->Extensions.NV_blend_square = GL_TRUE;
524 ctx->Extensions.NV_conditional_render = GL_TRUE;
525 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
526 ctx->Extensions.NV_point_sprite = GL_TRUE;
527 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
528 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
529 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
530 #if FEATURE_NV_vertex_program
531 ctx->Extensions.NV_vertex_program = GL_TRUE;
532 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
533 #endif
534 #if FEATURE_NV_fragment_program
535 ctx->Extensions.NV_fragment_program = GL_TRUE;
536 #endif
537 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
538 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
539 #endif
540 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/
541 ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
542 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
543 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
544 #endif
545 #if FEATURE_texture_fxt1
546 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
547 #endif
548 #if FEATURE_texture_s3tc
549 if (ctx->Mesa_DXTn) {
550 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
551 _mesa_enable_extension(ctx, "GL_S3_s3tc");
552 }
553 #endif
554 }
555
556
557 /**
558 * Enable common EXT extensions in the ARB_imaging subset.
559 */
560 void
561 _mesa_enable_imaging_extensions(struct gl_context *ctx)
562 {
563 ctx->Extensions.EXT_blend_color = GL_TRUE;
564 ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
565 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
566 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
567 }
568
569
570
571 /**
572 * Enable all OpenGL 1.3 features and extensions.
573 * A convenience function to be called by drivers.
574 */
575 void
576 _mesa_enable_1_3_extensions(struct gl_context *ctx)
577 {
578 /*ctx->Extensions.ARB_multisample = GL_TRUE;*/
579 ctx->Extensions.ARB_multitexture = GL_TRUE;
580 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
581 /*ctx->Extensions.ARB_texture_compression = GL_TRUE;*/
582 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
583 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
584 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
585 ctx->Extensions.EXT_texture_env_add = GL_TRUE;
586 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
587 }
588
589
590
591 /**
592 * Enable all OpenGL 1.4 features and extensions.
593 * A convenience function to be called by drivers.
594 */
595 void
596 _mesa_enable_1_4_extensions(struct gl_context *ctx)
597 {
598 ctx->Extensions.ARB_depth_texture = GL_TRUE;
599 ctx->Extensions.ARB_shadow = GL_TRUE;
600 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
601 ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
602 ctx->Extensions.ARB_window_pos = GL_TRUE;
603 ctx->Extensions.EXT_blend_color = GL_TRUE;
604 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
605 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
606 ctx->Extensions.EXT_blend_subtract = GL_TRUE;
607 ctx->Extensions.EXT_fog_coord = GL_TRUE;
608 /*ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;*/
609 ctx->Extensions.EXT_point_parameters = GL_TRUE;
610 ctx->Extensions.EXT_secondary_color = GL_TRUE;
611 ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
612 ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
613 /*ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;*/
614 }
615
616
617 /**
618 * Enable all OpenGL 1.5 features and extensions.
619 * A convenience function to be called by drivers.
620 */
621 void
622 _mesa_enable_1_5_extensions(struct gl_context *ctx)
623 {
624 ctx->Extensions.ARB_occlusion_query = GL_TRUE;
625 /*ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;*/
626 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
627 }
628
629
630 /**
631 * Enable all OpenGL 2.0 features and extensions.
632 * A convenience function to be called by drivers.
633 */
634 void
635 _mesa_enable_2_0_extensions(struct gl_context *ctx)
636 {
637 /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
638 #if FEATURE_ARB_fragment_shader
639 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
640 #endif
641 ctx->Extensions.ARB_point_sprite = GL_TRUE;
642 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
643 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
644 #if FEATURE_ARB_shader_objects
645 ctx->Extensions.ARB_shader_objects = GL_TRUE;
646 #endif
647 #if FEATURE_ARB_shading_language_100
648 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
649 #endif
650 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
651 #if FEATURE_ARB_vertex_shader
652 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
653 #endif
654 }
655
656
657 /**
658 * Enable all OpenGL 2.1 features and extensions.
659 * A convenience function to be called by drivers.
660 */
661 void
662 _mesa_enable_2_1_extensions(struct gl_context *ctx)
663 {
664 #if FEATURE_EXT_pixel_buffer_object
665 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
666 #endif
667 #if FEATURE_EXT_texture_sRGB
668 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
669 #endif
670 }
671
672
673 /**
674 * Either enable or disable the named extension.
675 * \return GL_TRUE for success, GL_FALSE if invalid extension name
676 */
677 static GLboolean
678 set_extension( struct gl_context *ctx, const char *name, GLboolean state )
679 {
680 size_t offset;
681
682 if (ctx->Extensions.String) {
683 /* The string was already queried - can't change it now! */
684 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
685 return GL_FALSE;
686 }
687
688 offset = name_to_offset(name);
689 if (offset == 0) {
690 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
691 name);
692 return GL_FALSE;
693 } else if (offset == o(dummy_true) && state == GL_FALSE) {
694 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
695 "%s", name);
696 return GL_FALSE;
697 } else {
698 GLboolean *base = (GLboolean *) &ctx->Extensions;
699 base[offset] = state;
700 return GL_TRUE;
701 }
702 }
703
704
705 /**
706 * Enable the named extension.
707 * Typically called by drivers.
708 */
709 void
710 _mesa_enable_extension( struct gl_context *ctx, const char *name )
711 {
712 if (!set_extension(ctx, name, GL_TRUE))
713 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
714 }
715
716
717 /**
718 * Disable the named extension.
719 * XXX is this really needed???
720 */
721 void
722 _mesa_disable_extension( struct gl_context *ctx, const char *name )
723 {
724 if (!set_extension(ctx, name, GL_FALSE))
725 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
726 }
727
728
729 /**
730 * Test if the named extension is enabled in this context.
731 */
732 GLboolean
733 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
734 {
735 size_t offset;
736 GLboolean *base;
737
738 if (name == 0)
739 return GL_FALSE;
740
741 offset = name_to_offset(name);
742 if (offset == 0)
743 return GL_FALSE;
744 base = (GLboolean *) &ctx->Extensions;
745 return base[offset];
746 }
747
748
749 /**
750 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
751 *
752 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
753 * enable or disable. The list is processed thus:
754 * - Enable recognized extension names that are prefixed with '+'.
755 * - Disable recognized extension names that are prefixed with '-'.
756 * - Enable recognized extension names that are not prefixed.
757 * - Collect unrecognized extension names in a new string.
758 *
759 * \return Space-separated list of unrecognized extension names (which must
760 * be freed). Does not return \c NULL.
761 */
762 static char *
763 get_extension_override( struct gl_context *ctx )
764 {
765 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
766 char *env;
767 char *ext;
768 char *extra_exts;
769 int len;
770
771 if (env_const == NULL) {
772 /* Return the empty string rather than NULL. This simplifies the logic
773 * of client functions. */
774 return calloc(1, sizeof(char));
775 }
776
777 /* extra_exts: List of unrecognized extensions. */
778 extra_exts = calloc(strlen(env_const), sizeof(char));
779
780 /* Copy env_const because strtok() is destructive. */
781 env = strdup(env_const);
782 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
783 int enable;
784 int recognized;
785 switch (ext[0]) {
786 case '+':
787 enable = 1;
788 ++ext;
789 break;
790 case '-':
791 enable = 0;
792 ++ext;
793 break;
794 default:
795 enable = 1;
796 break;
797 }
798 recognized = set_extension(ctx, ext, enable);
799 if (!recognized) {
800 strcat(extra_exts, ext);
801 strcat(extra_exts, " ");
802 }
803 }
804
805 /* Remove trailing space. */
806 len = strlen(extra_exts);
807 if (extra_exts[len - 1] == ' ')
808 extra_exts[len - 1] = '\0';
809
810 return extra_exts;
811 }
812
813
814 /**
815 * \brief Initialize extension tables and enable default extensions.
816 *
817 * This should be called during context initialization.
818 * Note: Sets gl_extensions.dummy_true to true.
819 */
820 void
821 _mesa_init_extensions( struct gl_context *ctx )
822 {
823 GLboolean *base = (GLboolean *) &ctx->Extensions;
824 GLboolean *sentinel = base + o(extension_sentinel);
825 GLboolean *i;
826 const size_t *j;
827
828 /* First, turn all extensions off. */
829 for (i = base; i != sentinel; ++i)
830 *i = GL_FALSE;
831
832 /* Then, selectively turn default extensions on. */
833 ctx->Extensions.dummy_true = GL_TRUE;
834 for (j = default_extensions; *j != 0; ++j)
835 base[*j] = GL_TRUE;
836 }
837
838
839 typedef unsigned short extension_index;
840
841
842 /**
843 * Compare two entries of the extensions table. Sorts first by year,
844 * then by name.
845 *
846 * Arguments are indices into extension_table.
847 */
848 static int
849 extension_compare(const void *p1, const void *p2)
850 {
851 extension_index i1 = * (const extension_index *) p1;
852 extension_index i2 = * (const extension_index *) p2;
853 const struct extension *e1 = &extension_table[i1];
854 const struct extension *e2 = &extension_table[i2];
855 int res;
856
857 res = (int)e1->year - (int)e2->year;
858
859 if (res == 0) {
860 res = strcmp(e1->name, e2->name);
861 }
862
863 return res;
864 }
865
866
867 /**
868 * Construct the GL_EXTENSIONS string. Called the first time that
869 * glGetString(GL_EXTENSIONS) is called.
870 */
871 GLubyte*
872 _mesa_make_extension_string(struct gl_context *ctx)
873 {
874 /* The extension string. */
875 char *exts = 0;
876 /* Length of extension string. */
877 size_t length = 0;
878 /* Number of extensions */
879 unsigned count;
880 /* Indices of the extensions sorted by year */
881 extension_index *extension_indices;
882 /* String of extra extensions. */
883 char *extra_extensions = get_extension_override(ctx);
884 GLboolean *base = (GLboolean *) &ctx->Extensions;
885 const struct extension *i;
886 unsigned j;
887 unsigned maxYear = ~0;
888
889 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
890 {
891 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
892 if (env) {
893 maxYear = atoi(env);
894 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
895 maxYear);
896 }
897 }
898
899 /* Compute length of the extension string. */
900 count = 0;
901 for (i = extension_table; i->name != 0; ++i) {
902 if (base[i->offset] &&
903 i->year <= maxYear &&
904 (i->api_set & (1 << ctx->API))) {
905 length += strlen(i->name) + 1; /* +1 for space */
906 ++count;
907 }
908 }
909 if (extra_extensions != NULL)
910 length += 1 + strlen(extra_extensions); /* +1 for space */
911
912 exts = (char *) calloc(length + 1, sizeof(char));
913 if (exts == NULL) {
914 free(extra_extensions);
915 return NULL;
916 }
917
918 extension_indices = malloc(count * sizeof(extension_index));
919 if (extension_indices == NULL) {
920 free(exts);
921 free(extra_extensions);
922 return NULL;
923 }
924
925 /* Sort extensions in chronological order because certain old applications (e.g.,
926 * Quake3 demo) store the extension list in a static size buffer so chronologically
927 * order ensure that the extensions that such applications expect will fit into
928 * that buffer.
929 */
930 j = 0;
931 for (i = extension_table; i->name != 0; ++i) {
932 if (base[i->offset] &&
933 i->year <= maxYear &&
934 (i->api_set & (1 << ctx->API))) {
935 extension_indices[j++] = i - extension_table;
936 }
937 }
938 assert(j == count);
939 qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
940
941 /* Build the extension string.*/
942 for (j = 0; j < count; ++j) {
943 i = &extension_table[extension_indices[j]];
944 assert(base[i->offset] && (i->api_set & (1 << ctx->API)));
945 strcat(exts, i->name);
946 strcat(exts, " ");
947 }
948 free(extension_indices);
949 if (extra_extensions != 0) {
950 strcat(exts, extra_extensions);
951 free(extra_extensions);
952 }
953
954 return (GLubyte *) exts;
955 }
956
957 /**
958 * Return number of enabled extensions.
959 */
960 GLuint
961 _mesa_get_extension_count(struct gl_context *ctx)
962 {
963 GLboolean *base;
964 const struct extension *i;
965
966 /* only count once */
967 if (ctx->Extensions.Count != 0)
968 return ctx->Extensions.Count;
969
970 base = (GLboolean *) &ctx->Extensions;
971 for (i = extension_table; i->name != 0; ++i) {
972 if (base[i->offset]) {
973 ctx->Extensions.Count++;
974 }
975 }
976 return ctx->Extensions.Count;
977 }
978
979 /**
980 * Return name of i-th enabled extension
981 */
982 const GLubyte *
983 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
984 {
985 const GLboolean *base;
986 size_t n;
987 const struct extension *i;
988
989 if (index < 0)
990 return NULL;
991
992 base = (GLboolean*) &ctx->Extensions;
993 n = 0;
994 for (i = extension_table; i->name != 0; ++i) {
995 if (n == index && base[i->offset]) {
996 return (GLubyte*) i->name;
997 } else if (base[i->offset]) {
998 ++n;
999 }
1000 }
1001
1002 return NULL;
1003 }