2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29 #include "extensions.h"
30 #include "simple_list.h"
34 #define F(x) (int)(unsigned long)&(((struct gl_extensions *)0)->x)
43 } default_extensions
[] = {
44 { OFF
, "GL_ARB_depth_texture", F(ARB_depth_texture
) },
45 { OFF
, "GL_ARB_fragment_program", F(ARB_fragment_program
) },
46 { OFF
, "GL_ARB_imaging", F(ARB_imaging
) },
47 { OFF
, "GL_ARB_multisample", F(ARB_multisample
) },
48 { OFF
, "GL_ARB_multitexture", F(ARB_multitexture
) },
49 { OFF
, "GL_ARB_occlusion_query", F(ARB_occlusion_query
) },
50 { OFF
, "GL_ARB_point_parameters", F(EXT_point_parameters
) },
51 { OFF
, "GL_ARB_point_sprite", F(ARB_point_sprite
) },
52 { OFF
, "GL_ARB_shadow", F(ARB_shadow
) },
53 { OFF
, "GL_ARB_shadow_ambient", F(SGIX_shadow_ambient
) },
54 { OFF
, "GL_ARB_texture_border_clamp", F(ARB_texture_border_clamp
) },
55 { OFF
, "GL_ARB_texture_compression", F(ARB_texture_compression
) },
56 { OFF
, "GL_ARB_texture_cube_map", F(ARB_texture_cube_map
) },
57 { OFF
, "GL_ARB_texture_env_add", F(EXT_texture_env_add
) },
58 { OFF
, "GL_ARB_texture_env_combine", F(ARB_texture_env_combine
) },
59 { OFF
, "GL_ARB_texture_env_crossbar", F(ARB_texture_env_crossbar
) },
60 { OFF
, "GL_ARB_texture_env_dot3", F(ARB_texture_env_dot3
) },
61 { OFF
, "GL_ARB_texture_mirrored_repeat", F(ARB_texture_mirrored_repeat
)},
62 { OFF
, "GL_ARB_texture_non_power_of_two", F(ARB_texture_non_power_of_two
)},
63 { ON
, "GL_ARB_transpose_matrix", F(ARB_transpose_matrix
) },
64 { OFF
, "GL_ARB_vertex_buffer_object", F(ARB_vertex_buffer_object
) },
65 { OFF
, "GL_ARB_vertex_program", F(ARB_vertex_program
) },
66 { ON
, "GL_ARB_window_pos", F(ARB_window_pos
) },
67 { ON
, "GL_EXT_abgr", F(EXT_abgr
) },
68 { ON
, "GL_EXT_bgra", F(EXT_bgra
) },
69 { OFF
, "GL_EXT_blend_color", F(EXT_blend_color
) },
70 { OFF
, "GL_EXT_blend_equation_separate", F(EXT_blend_equation_separate
) },
71 { OFF
, "GL_EXT_blend_func_separate", F(EXT_blend_func_separate
) },
72 { OFF
, "GL_EXT_blend_logic_op", F(EXT_blend_logic_op
) },
73 { OFF
, "GL_EXT_blend_minmax", F(EXT_blend_minmax
) },
74 { OFF
, "GL_EXT_blend_subtract", F(EXT_blend_subtract
) },
75 { ON
, "GL_EXT_clip_volume_hint", F(EXT_clip_volume_hint
) },
76 { ON
, "GL_EXT_compiled_vertex_array", F(EXT_compiled_vertex_array
) },
77 { OFF
, "GL_EXT_convolution", F(EXT_convolution
) },
78 { ON
, "GL_EXT_copy_texture", F(EXT_copy_texture
) },
79 { OFF
, "GL_EXT_depth_bounds_test", F(EXT_depth_bounds_test
) },
80 { ON
, "GL_EXT_draw_range_elements", F(EXT_draw_range_elements
) },
81 { OFF
, "GL_EXT_fog_coord", F(EXT_fog_coord
) },
82 { OFF
, "GL_EXT_histogram", F(EXT_histogram
) },
83 { OFF
, "GL_EXT_multi_draw_arrays", F(EXT_multi_draw_arrays
) },
84 { ON
, "GL_EXT_packed_pixels", F(EXT_packed_pixels
) },
85 { OFF
, "GL_EXT_paletted_texture", F(EXT_paletted_texture
) },
86 { OFF
, "GL_EXT_point_parameters", F(EXT_point_parameters
) },
87 { ON
, "GL_EXT_polygon_offset", F(EXT_polygon_offset
) },
88 { ON
, "GL_EXT_rescale_normal", F(EXT_rescale_normal
) },
89 { OFF
, "GL_EXT_secondary_color", F(EXT_secondary_color
) },
90 { ON
, "GL_EXT_separate_specular_color", F(EXT_separate_specular_color
) },
91 { OFF
, "GL_EXT_shadow_funcs", F(EXT_shadow_funcs
) },
92 { OFF
, "GL_EXT_shared_texture_palette", F(EXT_shared_texture_palette
) },
93 { OFF
, "GL_EXT_stencil_two_side", F(EXT_stencil_two_side
) },
94 { OFF
, "GL_EXT_stencil_wrap", F(EXT_stencil_wrap
) },
95 { ON
, "GL_EXT_subtexture", F(EXT_subtexture
) },
96 { ON
, "GL_EXT_texture", F(EXT_texture
) },
97 { ON
, "GL_EXT_texture3D", F(EXT_texture3D
) },
98 { OFF
, "GL_EXT_texture_compression_s3tc", F(EXT_texture_compression_s3tc
) },
99 { ON
, "GL_EXT_texture_edge_clamp", F(SGIS_texture_edge_clamp
) },
100 { OFF
, "GL_EXT_texture_env_add", F(EXT_texture_env_add
) },
101 { OFF
, "GL_EXT_texture_env_combine", F(EXT_texture_env_combine
) },
102 { OFF
, "GL_EXT_texture_env_dot3", F(EXT_texture_env_dot3
) },
103 { OFF
, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic
) },
104 { OFF
, "GL_EXT_texture_lod_bias", F(EXT_texture_lod_bias
) },
105 { OFF
, "GL_EXT_texture_mirror_clamp", F(EXT_texture_mirror_clamp
) },
106 { ON
, "GL_EXT_texture_object", F(EXT_texture_object
) },
107 { OFF
, "GL_EXT_texture_rectangle", F(NV_texture_rectangle
) },
108 { ON
, "GL_EXT_vertex_array", F(EXT_vertex_array
) },
109 { OFF
, "GL_EXT_vertex_array_set", F(EXT_vertex_array_set
) },
110 { OFF
, "GL_3DFX_texture_compression_FXT1", F(TDFX_texture_compression_FXT1
) },
111 { OFF
, "GL_APPLE_client_storage", F(APPLE_client_storage
) },
112 { ON
, "GL_APPLE_packed_pixels", F(APPLE_packed_pixels
) },
113 { OFF
, "GL_ATI_blend_equation_separate", F(EXT_blend_equation_separate
) },
114 { OFF
, "GL_ATI_texture_env_combine3", F(ATI_texture_env_combine3
)},
115 { OFF
, "GL_ATI_texture_mirror_once", F(ATI_texture_mirror_once
)},
116 { OFF
, "GL_HP_occlusion_test", F(HP_occlusion_test
) },
117 { OFF
, "GL_IBM_multimode_draw_arrays", F(IBM_multimode_draw_arrays
) },
118 { ON
, "GL_IBM_rasterpos_clip", F(IBM_rasterpos_clip
) },
119 { OFF
, "GL_IBM_texture_mirrored_repeat", F(ARB_texture_mirrored_repeat
)},
120 { OFF
, "GL_INGR_blend_func_separate", F(EXT_blend_func_separate
) },
121 { OFF
, "GL_MESA_pack_invert", F(MESA_pack_invert
) },
122 { OFF
, "GL_MESA_packed_depth_stencil", F(MESA_packed_depth_stencil
) },
123 { OFF
, "GL_MESA_program_debug", F(MESA_program_debug
) },
124 { OFF
, "GL_MESA_resize_buffers", F(MESA_resize_buffers
) },
125 { OFF
, "GL_MESA_ycbcr_texture", F(MESA_ycbcr_texture
) },
126 { ON
, "GL_MESA_window_pos", F(ARB_window_pos
) },
127 { OFF
, "GL_NV_blend_square", F(NV_blend_square
) },
128 { OFF
, "GL_NV_fragment_program", F(NV_fragment_program
) },
129 { ON
, "GL_NV_light_max_exponent", F(NV_light_max_exponent
) },
130 { OFF
, "GL_NV_point_sprite", F(NV_point_sprite
) },
131 { OFF
, "GL_NV_texture_rectangle", F(NV_texture_rectangle
) },
132 { ON
, "GL_NV_texgen_reflection", F(NV_texgen_reflection
) },
133 { OFF
, "GL_NV_vertex_program", F(NV_vertex_program
) },
134 { OFF
, "GL_NV_vertex_program1_1", F(NV_vertex_program1_1
) },
135 { OFF
, "GL_SGI_color_matrix", F(SGI_color_matrix
) },
136 { OFF
, "GL_SGI_color_table", F(SGI_color_table
) },
137 { OFF
, "GL_SGI_texture_color_table", F(SGI_texture_color_table
) },
138 { OFF
, "GL_SGIS_generate_mipmap", F(SGIS_generate_mipmap
) },
139 { OFF
, "GL_SGIS_pixel_texture", F(SGIS_pixel_texture
) },
140 { OFF
, "GL_SGIS_texture_border_clamp", F(ARB_texture_border_clamp
) },
141 { ON
, "GL_SGIS_texture_edge_clamp", F(SGIS_texture_edge_clamp
) },
142 { ON
, "GL_SGIS_texture_lod", F(SGIS_texture_lod
) },
143 { OFF
, "GL_SGIX_depth_texture", F(SGIX_depth_texture
) },
144 { OFF
, "GL_SGIX_pixel_texture", F(SGIX_pixel_texture
) },
145 { OFF
, "GL_SGIX_shadow", F(SGIX_shadow
) },
146 { OFF
, "GL_SGIX_shadow_ambient", F(SGIX_shadow_ambient
) },
147 { OFF
, "GL_SUN_multi_draw_arrays", F(EXT_multi_draw_arrays
) },
148 { OFF
, "GL_S3_s3tc", F(S3_s3tc
) },
154 * Enable all extensions suitable for a software-only renderer.
155 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
158 _mesa_enable_sw_extensions(GLcontext
*ctx
)
160 ctx
->Extensions
.ARB_depth_texture
= GL_TRUE
;
161 #if FEATURE_ARB_fragment_program
162 /*ctx->Extensions.ARB_fragment_program = GL_TRUE;*/
164 ctx
->Extensions
.ARB_imaging
= GL_TRUE
;
165 ctx
->Extensions
.ARB_multitexture
= GL_TRUE
;
166 #if FEATURE_ARB_occlusion_query
167 ctx
->Extensions
.ARB_occlusion_query
= GL_TRUE
;
169 ctx
->Extensions
.ARB_point_sprite
= GL_TRUE
;
170 ctx
->Extensions
.ARB_shadow
= GL_TRUE
;
171 ctx
->Extensions
.ARB_texture_border_clamp
= GL_TRUE
;
172 ctx
->Extensions
.ARB_texture_cube_map
= GL_TRUE
;
173 ctx
->Extensions
.ARB_texture_env_combine
= GL_TRUE
;
174 ctx
->Extensions
.ARB_texture_env_crossbar
= GL_TRUE
;
175 ctx
->Extensions
.ARB_texture_env_dot3
= GL_TRUE
;
176 ctx
->Extensions
.ARB_texture_mirrored_repeat
= GL_TRUE
;
177 ctx
->Extensions
.ARB_texture_non_power_of_two
= GL_TRUE
;
178 #if FEATURE_ARB_vertex_program
179 /*ctx->Extensions.ARB_vertex_program = GL_TRUE;*/
181 #if FEATURE_ARB_vertex_buffer_object
182 ctx
->Extensions
.ARB_vertex_buffer_object
= GL_TRUE
;
184 ctx
->Extensions
.ATI_texture_env_combine3
= GL_TRUE
;
185 ctx
->Extensions
.ATI_texture_mirror_once
= GL_TRUE
;
186 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
187 ctx
->Extensions
.EXT_blend_equation_separate
= GL_TRUE
;
188 ctx
->Extensions
.EXT_blend_func_separate
= GL_TRUE
;
189 ctx
->Extensions
.EXT_blend_logic_op
= GL_TRUE
;
190 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
191 ctx
->Extensions
.EXT_blend_subtract
= GL_TRUE
;
192 ctx
->Extensions
.EXT_convolution
= GL_TRUE
;
193 ctx
->Extensions
.EXT_depth_bounds_test
= GL_TRUE
;
194 ctx
->Extensions
.EXT_fog_coord
= GL_TRUE
;
195 ctx
->Extensions
.EXT_histogram
= GL_TRUE
;
196 ctx
->Extensions
.EXT_multi_draw_arrays
= GL_TRUE
;
197 ctx
->Extensions
.EXT_paletted_texture
= GL_TRUE
;
198 ctx
->Extensions
.EXT_point_parameters
= GL_TRUE
;
199 ctx
->Extensions
.EXT_shadow_funcs
= GL_TRUE
;
200 ctx
->Extensions
.EXT_secondary_color
= GL_TRUE
;
201 ctx
->Extensions
.EXT_shared_texture_palette
= GL_TRUE
;
202 ctx
->Extensions
.EXT_stencil_wrap
= GL_TRUE
;
203 ctx
->Extensions
.EXT_stencil_two_side
= GL_TRUE
;
204 ctx
->Extensions
.EXT_texture_env_add
= GL_TRUE
;
205 ctx
->Extensions
.EXT_texture_env_combine
= GL_TRUE
;
206 ctx
->Extensions
.EXT_texture_env_dot3
= GL_TRUE
;
207 ctx
->Extensions
.EXT_texture_mirror_clamp
= GL_TRUE
;
208 ctx
->Extensions
.EXT_texture_lod_bias
= GL_TRUE
;
209 ctx
->Extensions
.HP_occlusion_test
= GL_TRUE
;
210 ctx
->Extensions
.IBM_multimode_draw_arrays
= GL_TRUE
;
211 ctx
->Extensions
.MESA_pack_invert
= GL_TRUE
;
212 #if FEATURE_MESA_program_debug
213 ctx
->Extensions
.MESA_program_debug
= GL_TRUE
;
215 ctx
->Extensions
.MESA_resize_buffers
= GL_TRUE
;
216 ctx
->Extensions
.MESA_ycbcr_texture
= GL_TRUE
;
217 ctx
->Extensions
.NV_blend_square
= GL_TRUE
;
218 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
219 ctx
->Extensions
.NV_point_sprite
= GL_TRUE
;
220 ctx
->Extensions
.NV_texture_rectangle
= GL_TRUE
;
221 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
222 #if FEATURE_NV_vertex_program
223 ctx
->Extensions
.NV_vertex_program
= GL_TRUE
;
224 ctx
->Extensions
.NV_vertex_program1_1
= GL_TRUE
;
226 #if FEATURE_NV_fragment_program
227 ctx
->Extensions
.NV_fragment_program
= GL_TRUE
;
229 ctx
->Extensions
.SGI_color_matrix
= GL_TRUE
;
230 ctx
->Extensions
.SGI_color_table
= GL_TRUE
;
231 ctx
->Extensions
.SGI_texture_color_table
= GL_TRUE
;
232 ctx
->Extensions
.SGIS_generate_mipmap
= GL_TRUE
;
233 ctx
->Extensions
.SGIS_pixel_texture
= GL_TRUE
;
234 ctx
->Extensions
.SGIS_texture_edge_clamp
= GL_TRUE
;
235 ctx
->Extensions
.SGIX_depth_texture
= GL_TRUE
;
236 ctx
->Extensions
.SGIX_pixel_texture
= GL_TRUE
;
237 ctx
->Extensions
.SGIX_shadow
= GL_TRUE
;
238 ctx
->Extensions
.SGIX_shadow_ambient
= GL_TRUE
;
243 * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
246 _mesa_enable_imaging_extensions(GLcontext
*ctx
)
248 ctx
->Extensions
.ARB_imaging
= GL_TRUE
;
249 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
250 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
251 ctx
->Extensions
.EXT_blend_subtract
= GL_TRUE
;
252 ctx
->Extensions
.EXT_convolution
= GL_TRUE
;
253 ctx
->Extensions
.EXT_histogram
= GL_TRUE
;
254 ctx
->Extensions
.SGI_color_matrix
= GL_TRUE
;
255 ctx
->Extensions
.SGI_color_table
= GL_TRUE
;
261 * Enable all OpenGL 1.3 features and extensions.
262 * A convenience function to be called by drivers.
265 _mesa_enable_1_3_extensions(GLcontext
*ctx
)
267 ctx
->Extensions
.ARB_multisample
= GL_TRUE
;
268 ctx
->Extensions
.ARB_multitexture
= GL_TRUE
;
269 ctx
->Extensions
.ARB_texture_border_clamp
= GL_TRUE
;
270 ctx
->Extensions
.ARB_texture_compression
= GL_TRUE
;
271 ctx
->Extensions
.ARB_texture_cube_map
= GL_TRUE
;
272 ctx
->Extensions
.ARB_texture_env_combine
= GL_TRUE
;
273 ctx
->Extensions
.ARB_texture_env_dot3
= GL_TRUE
;
274 ctx
->Extensions
.EXT_texture_env_add
= GL_TRUE
;
275 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
281 * Enable all OpenGL 1.4 features and extensions.
282 * A convenience function to be called by drivers.
285 _mesa_enable_1_4_extensions(GLcontext
*ctx
)
287 ctx
->Extensions
.ARB_depth_texture
= GL_TRUE
;
288 ctx
->Extensions
.ARB_fragment_program
= GL_TRUE
;
289 ctx
->Extensions
.ARB_shadow
= GL_TRUE
;
290 ctx
->Extensions
.ARB_texture_env_crossbar
= GL_TRUE
;
291 ctx
->Extensions
.ARB_texture_mirrored_repeat
= GL_TRUE
;
292 ctx
->Extensions
.ARB_vertex_program
= GL_TRUE
;
293 ctx
->Extensions
.ARB_window_pos
= GL_TRUE
;
294 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
295 ctx
->Extensions
.EXT_blend_func_separate
= GL_TRUE
;
296 ctx
->Extensions
.EXT_blend_logic_op
= GL_TRUE
;
297 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
298 ctx
->Extensions
.EXT_blend_subtract
= GL_TRUE
;
299 ctx
->Extensions
.EXT_fog_coord
= GL_TRUE
;
300 ctx
->Extensions
.EXT_multi_draw_arrays
= GL_TRUE
;
301 ctx
->Extensions
.EXT_point_parameters
= GL_TRUE
;
302 ctx
->Extensions
.EXT_secondary_color
= GL_TRUE
;
303 ctx
->Extensions
.EXT_stencil_wrap
= GL_TRUE
;
304 ctx
->Extensions
.EXT_texture_lod_bias
= GL_TRUE
;
305 ctx
->Extensions
.SGIS_generate_mipmap
= GL_TRUE
;
310 * Enable all OpenGL 1.5 features and extensions.
311 * A convenience function to be called by drivers.
314 _mesa_enable_1_5_extensions(GLcontext
*ctx
)
316 ctx
->Extensions
.ARB_occlusion_query
= GL_TRUE
;
317 ctx
->Extensions
.ARB_vertex_buffer_object
= GL_TRUE
;
318 ctx
->Extensions
.ARB_texture_non_power_of_two
= GL_TRUE
;
319 ctx
->Extensions
.EXT_shadow_funcs
= GL_TRUE
;
324 * Either enable or disable the named extension.
327 set_extension( GLcontext
*ctx
, const char *name
, GLboolean state
)
329 GLboolean
*base
= (GLboolean
*) &ctx
->Extensions
;
332 if (ctx
->Extensions
.String
) {
333 /* The string was already queried - can't change it now! */
334 _mesa_problem(ctx
, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name
);
338 for (i
= 0 ; i
< Elements(default_extensions
) ; i
++) {
339 if (_mesa_strcmp(default_extensions
[i
].name
, name
) == 0) {
340 if (default_extensions
[i
].flag_offset
) {
341 GLboolean
*enabled
= base
+ default_extensions
[i
].flag_offset
;
347 _mesa_problem(ctx
, "Trying to enable unknown extension: %s", name
);
352 * Enable the named extension.
353 * Typically called by drivers.
356 _mesa_enable_extension( GLcontext
*ctx
, const char *name
)
358 set_extension(ctx
, name
, GL_TRUE
);
363 * Disable the named extension.
364 * XXX is this really needed???
367 _mesa_disable_extension( GLcontext
*ctx
, const char *name
)
369 set_extension(ctx
, name
, GL_FALSE
);
374 * Test if the named extension is enabled in this context.
377 _mesa_extension_is_enabled( GLcontext
*ctx
, const char *name
)
379 const GLboolean
*base
= (const GLboolean
*) &ctx
->Extensions
;
382 for (i
= 0 ; i
< Elements(default_extensions
) ; i
++) {
383 if (_mesa_strcmp(default_extensions
[i
].name
, name
) == 0) {
384 if (!default_extensions
[i
].flag_offset
)
386 return *(base
+ default_extensions
[i
].flag_offset
);
394 * Run through the default_extensions array above and set the
395 * ctx->Extensions.ARB/EXT_* flags accordingly.
396 * To be called during context initialization.
399 _mesa_init_extensions( GLcontext
*ctx
)
401 GLboolean
*base
= (GLboolean
*) &ctx
->Extensions
;
404 for (i
= 0 ; i
< Elements(default_extensions
) ; i
++) {
405 if (default_extensions
[i
].enabled
&&
406 default_extensions
[i
].flag_offset
) {
407 *(base
+ default_extensions
[i
].flag_offset
) = GL_TRUE
;
414 * Construct the GL_EXTENSIONS string. Called the first time that
415 * glGetString(GL_EXTENSIONS) is called.
418 _mesa_make_extension_string( GLcontext
*ctx
)
420 const GLboolean
*base
= (const GLboolean
*) &ctx
->Extensions
;
421 GLuint extStrLen
= 0;
425 /* first, compute length of the extension string */
426 for (i
= 0 ; i
< Elements(default_extensions
) ; i
++) {
427 if (!default_extensions
[i
].flag_offset
||
428 *(base
+ default_extensions
[i
].flag_offset
)) {
429 extStrLen
+= _mesa_strlen(default_extensions
[i
].name
) + 1;
432 s
= (GLubyte
*) _mesa_malloc(extStrLen
);
434 /* second, build the extension string */
436 for (i
= 0 ; i
< Elements(default_extensions
) ; i
++) {
437 if (!default_extensions
[i
].flag_offset
||
438 *(base
+ default_extensions
[i
].flag_offset
)) {
439 GLuint len
= _mesa_strlen(default_extensions
[i
].name
);
440 _mesa_memcpy(s
+ extStrLen
, default_extensions
[i
].name
, len
);
442 s
[extStrLen
] = (GLubyte
) ' ';
446 ASSERT(extStrLen
> 0);
448 s
[extStrLen
- 1] = 0;