2793ab4e8d931da5382ec7c97c7f0786e741573b
[reactos.git] / reactos / dll / opengl / mesa / src / mesa / main / extensions.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.6
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /**
28 * \file
29 * \brief Extension handling
30 */
31
32
33 #include "glheader.h"
34 #include "imports.h"
35 #include "context.h"
36 #include "extensions.h"
37 #include "mfeatures.h"
38 #include "mtypes.h"
39
40 #define ALIGN(value, alignment) (((value) + alignment - 1) & ~(alignment - 1))
41
42 enum {
43 DISABLE = 0,
44 GL = 1 << API_OPENGL,
45 ES1 = 1 << API_OPENGLES,
46 ES2 = 1 << API_OPENGLES2,
47 };
48
49 /**
50 * \brief An element of the \c extension_table.
51 */
52 struct extension {
53 /** Name of extension, such as "GL_ARB_depth_clamp". */
54 const char *name;
55
56 /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
57 size_t offset;
58
59 /** Set of API's in which the extension exists, as a bitset. */
60 uint8_t api_set;
61
62 /** Year the extension was proposed or approved. Used to sort the
63 * extension string chronologically. */
64 uint16_t year;
65 };
66
67
68 /**
69 * Given a member \c x of struct gl_extensions, return offset of
70 * \c x in bytes.
71 */
72 #define o(x) offsetof(struct gl_extensions, x)
73
74
75 /**
76 * \brief Table of supported OpenGL extensions for all API's.
77 */
78 static const struct extension extension_table[] = {
79 /* ARB Extensions */
80 { "GL_ARB_ES2_compatibility", o(ARB_ES2_compatibility), GL, 2009 },
81 { "GL_ARB_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_conservative_depth", o(ARB_conservative_depth), GL, 2011 },
85 { "GL_ARB_depth_buffer_float", o(ARB_depth_buffer_float), GL, 2008 },
86 { "GL_ARB_depth_clamp", o(ARB_depth_clamp), GL, 2003 },
87 { "GL_ARB_draw_buffers", o(dummy_true), 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_map_buffer_range", o(ARB_map_buffer_range), GL, 2008 },
101 { "GL_ARB_multisample", o(dummy_true), GL, 1994 },
102 { "GL_ARB_multitexture", o(dummy_true), GL, 1998 },
103 { "GL_ARB_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
104 { "GL_ARB_point_parameters", o(EXT_point_parameters), GL, 1997 },
105 { "GL_ARB_point_sprite", o(ARB_point_sprite), GL, 2003 },
106 { "GL_ARB_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
107 { "GL_ARB_robustness", o(dummy_true), GL, 2010 },
108 { "GL_ARB_seamless_cube_map", o(ARB_seamless_cube_map), GL, 2009 },
109 { "GL_ARB_shader_objects", o(ARB_shader_objects), GL, 2002 },
110 { "GL_ARB_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
111 { "GL_ARB_shader_texture_lod", o(ARB_shader_texture_lod), GL, 2009 },
112 { "GL_ARB_shading_language_100", o(ARB_shading_language_100), GL, 2003 },
113 { "GL_ARB_texture_border_clamp", o(ARB_texture_border_clamp), GL, 2000 },
114 { "GL_ARB_texture_buffer_object", o(ARB_texture_buffer_object), GL, 2008 },
115 { "GL_ARB_texture_compression", o(dummy_true), GL, 2000 },
116 { "GL_ARB_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
117 { "GL_ARB_texture_cube_map", o(ARB_texture_cube_map), GL, 1999 },
118 { "GL_ARB_texture_env_add", o(dummy_true), GL, 1999 },
119 { "GL_ARB_texture_env_combine", o(ARB_texture_env_combine), GL, 2001 },
120 { "GL_ARB_texture_env_crossbar", o(ARB_texture_env_crossbar), GL, 2001 },
121 { "GL_ARB_texture_env_dot3", o(ARB_texture_env_dot3), GL, 2001 },
122 { "GL_ARB_texture_float", o(ARB_texture_float), GL, 2004 },
123 { "GL_ARB_texture_mirrored_repeat", o(dummy_true), GL, 2001 },
124 { "GL_ARB_texture_multisample", o(ARB_texture_multisample), GL, 2009 },
125 { "GL_ARB_texture_non_power_of_two", o(ARB_texture_non_power_of_two), GL, 2003 },
126 { "GL_ARB_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
127 { "GL_ARB_texture_rg", o(ARB_texture_rg), GL, 2008 },
128 { "GL_ARB_texture_storage", o(ARB_texture_storage), GL, 2011 },
129 { "GL_ARB_transpose_matrix", o(ARB_transpose_matrix), GL, 1999 },
130 { "GL_ARB_uniform_buffer_object", o(ARB_uniform_buffer_object), GL, 2002 },
131 { "GL_ARB_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
132 { "GL_ARB_vertex_array_object", o(ARB_vertex_array_object), GL, 2006 },
133 { "GL_ARB_vertex_buffer_object", o(dummy_true), GL, 2003 },
134 { "GL_ARB_vertex_program", o(ARB_vertex_program), GL, 2002 },
135 { "GL_ARB_vertex_shader", o(ARB_vertex_shader), GL, 2002 },
136 { "GL_ARB_window_pos", o(ARB_window_pos), GL, 2001 },
137 /* EXT extensions */
138 { "GL_EXT_abgr", o(dummy_true), GL, 1995 },
139 { "GL_EXT_bgra", o(dummy_true), GL, 1995 },
140 { "GL_EXT_blend_color", o(EXT_blend_color), GL, 1995 },
141 { "GL_EXT_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
142 { "GL_EXT_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
143 { "GL_EXT_blend_minmax", o(EXT_blend_minmax), GL | ES1 | ES2, 1995 },
144 { "GL_EXT_blend_subtract", o(dummy_true), GL, 1995 },
145 { "GL_EXT_clip_volume_hint", o(EXT_clip_volume_hint), GL, 1996 },
146 { "GL_EXT_compiled_vertex_array", o(EXT_compiled_vertex_array), GL, 1996 },
147 { "GL_EXT_copy_texture", o(dummy_true), GL, 1995 },
148 { "GL_EXT_depth_bounds_test", o(EXT_depth_bounds_test), GL, 2002 },
149 { "GL_EXT_draw_instanced", o(ARB_draw_instanced), GL, 2006 },
150 { "GL_EXT_draw_range_elements", o(EXT_draw_range_elements), GL, 1997 },
151 { "GL_EXT_fog_coord", o(EXT_fog_coord), GL, 1999 },
152 { "GL_EXT_framebuffer_blit", o(EXT_framebuffer_blit), GL, 2005 },
153 { "GL_EXT_framebuffer_multisample", o(EXT_framebuffer_multisample), GL, 2005 },
154 { "GL_EXT_framebuffer_object", o(EXT_framebuffer_object), GL, 2000 },
155 { "GL_EXT_framebuffer_sRGB", o(EXT_framebuffer_sRGB), GL, 1998 },
156 { "GL_EXT_gpu_program_parameters", o(EXT_gpu_program_parameters), GL, 2006 },
157 { "GL_EXT_gpu_shader4", o(EXT_gpu_shader4), GL, 2006 },
158 { "GL_EXT_multi_draw_arrays", o(dummy_true), GL | ES1 | ES2, 1999 },
159 { "GL_EXT_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2005 },
160 { "GL_EXT_packed_pixels", o(EXT_packed_pixels), GL, 1997 },
161 { "GL_EXT_pixel_buffer_object", o(EXT_pixel_buffer_object), GL, 2004 },
162 { "GL_EXT_point_parameters", o(EXT_point_parameters), GL, 1997 },
163 { "GL_EXT_polygon_offset", o(dummy_true), GL, 1995 },
164 { "GL_EXT_provoking_vertex", o(EXT_provoking_vertex), GL, 2009 },
165 { "GL_EXT_rescale_normal", o(EXT_rescale_normal), GL, 1997 },
166 { "GL_EXT_secondary_color", o(EXT_secondary_color), GL, 1999 },
167 { "GL_EXT_separate_shader_objects", o(EXT_separate_shader_objects), GL, 2008 },
168 { "GL_EXT_separate_specular_color", o(EXT_separate_specular_color), GL, 1997 },
169 { "GL_EXT_shadow_funcs", o(EXT_shadow_funcs), GL, 2002 },
170 { "GL_EXT_stencil_two_side", o(EXT_stencil_two_side), GL, 2001 },
171 { "GL_EXT_stencil_wrap", o(dummy_true), GL, 2002 },
172 { "GL_EXT_subtexture", o(dummy_true), GL, 1995 },
173 { "GL_EXT_texture3D", o(EXT_texture3D), GL, 1996 },
174 { "GL_EXT_texture_array", o(EXT_texture_array), GL, 2006 },
175 { "GL_EXT_texture_compression_dxt1", o(EXT_texture_compression_s3tc), GL | ES1 | ES2, 2004 },
176 { "GL_EXT_texture_compression_latc", o(EXT_texture_compression_latc), GL, 2006 },
177 { "GL_EXT_texture_compression_rgtc", o(ARB_texture_compression_rgtc), GL, 2004 },
178 { "GL_EXT_texture_compression_s3tc", o(EXT_texture_compression_s3tc), GL, 2000 },
179 { "GL_EXT_texture_cube_map", o(ARB_texture_cube_map), GL, 2001 },
180 { "GL_EXT_texture_edge_clamp", o(dummy_true), GL, 1997 },
181 { "GL_EXT_texture_env_add", o(dummy_true), GL, 1999 },
182 { "GL_EXT_texture_env_combine", o(dummy_true), GL, 2000 },
183 { "GL_EXT_texture_env_dot3", o(EXT_texture_env_dot3), GL, 2000 },
184 { "GL_EXT_texture_filter_anisotropic", o(EXT_texture_filter_anisotropic), GL | ES1 | ES2, 1999 },
185 { "GL_EXT_texture_format_BGRA8888", o(dummy_true), ES1 | ES2, 2005 },
186 { "GL_EXT_texture_integer", o(EXT_texture_integer), GL, 2006 },
187 { "GL_EXT_texture_lod_bias", o(dummy_true), GL | ES1, 1999 },
188 { "GL_EXT_texture_mirror_clamp", o(EXT_texture_mirror_clamp), GL, 2004 },
189 { "GL_EXT_texture_object", o(dummy_true), GL, 1995 },
190 { "GL_EXT_texture", o(dummy_true), GL, 1996 },
191 { "GL_EXT_texture_rectangle", o(NV_texture_rectangle), GL, 2004 },
192 { "GL_EXT_texture_snorm", o(EXT_texture_snorm), GL, 2009 },
193 { "GL_EXT_texture_sRGB", o(EXT_texture_sRGB), GL, 2004 },
194 { "GL_EXT_texture_type_2_10_10_10_REV", o(dummy_true), ES2, 2008 },
195 { "GL_EXT_vertex_array_bgra", o(EXT_vertex_array_bgra), GL, 2008 },
196 { "GL_EXT_vertex_array", o(dummy_true), GL, 1995 },
197
198 /* OES extensions */
199 { "GL_OES_blend_equation_separate", o(EXT_blend_equation_separate), ES1, 2009 },
200 { "GL_OES_blend_func_separate", o(EXT_blend_func_separate), ES1, 2009 },
201 { "GL_OES_blend_subtract", o(dummy_true), ES1, 2009 },
202 { "GL_OES_byte_coordinates", o(dummy_true), ES1, 2002 },
203 { "GL_OES_compressed_paletted_texture", o(dummy_true), ES1, 2003 },
204 { "GL_OES_depth24", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
205 { "GL_OES_depth32", o(dummy_false), DISABLE, 2005 },
206 #if FEATURE_OES_draw_texture
207 { "GL_OES_draw_texture", o(OES_draw_texture), ES1 | ES2, 2004 },
208 #endif
209 #if FEATURE_OES_EGL_image
210 /* FIXME: Mesa expects GL_OES_EGL_image to be available in OpenGL contexts. */
211 { "GL_OES_EGL_image", o(OES_EGL_image), GL | ES1 | ES2, 2006 },
212 { "GL_OES_EGL_image_external", o(OES_EGL_image_external), ES1 | ES2, 2010 },
213 #endif
214 { "GL_OES_element_index_uint", o(dummy_true), ES1 | ES2, 2005 },
215 { "GL_OES_fbo_render_mipmap", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
216 { "GL_OES_fixed_point", o(dummy_true), ES1, 2002 },
217 { "GL_OES_framebuffer_object", o(EXT_framebuffer_object), ES1, 2005 },
218 { "GL_OES_mapbuffer", o(dummy_true), ES1 | ES2, 2005 },
219 { "GL_OES_matrix_get", o(dummy_true), ES1, 2004 },
220 { "GL_OES_packed_depth_stencil", o(EXT_packed_depth_stencil), ES1 | ES2, 2007 },
221 { "GL_OES_point_size_array", o(dummy_true), ES1, 2004 },
222 { "GL_OES_point_sprite", o(ARB_point_sprite), ES1, 2004 },
223 { "GL_OES_query_matrix", o(dummy_true), ES1, 2003 },
224 { "GL_OES_read_format", o(dummy_true), GL | ES1, 2003 },
225 { "GL_OES_rgb8_rgba8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
226 { "GL_OES_single_precision", o(dummy_true), ES1, 2003 },
227 { "GL_OES_standard_derivatives", o(OES_standard_derivatives), ES2, 2005 },
228 { "GL_OES_stencil1", o(dummy_false), DISABLE, 2005 },
229 { "GL_OES_stencil4", o(dummy_false), DISABLE, 2005 },
230 { "GL_OES_stencil8", o(EXT_framebuffer_object), ES1 | ES2, 2005 },
231 { "GL_OES_stencil_wrap", o(dummy_true), ES1, 2002 },
232 { "GL_OES_texture_3D", o(EXT_texture3D), ES2, 2005 },
233 { "GL_OES_texture_cube_map", o(ARB_texture_cube_map), ES1, 2007 },
234 { "GL_OES_texture_env_crossbar", o(ARB_texture_env_crossbar), ES1, 2005 },
235 { "GL_OES_texture_mirrored_repeat", o(dummy_true), ES1, 2005 },
236 { "GL_OES_texture_npot", o(ARB_texture_non_power_of_two), ES2, 2005 },
237
238 /* Vendor extensions */
239 { "GL_3DFX_texture_compression_FXT1", o(TDFX_texture_compression_FXT1), GL, 1999 },
240 { "GL_AMD_conservative_depth", o(ARB_conservative_depth), GL, 2009 },
241 { "GL_AMD_draw_buffers_blend", o(ARB_draw_buffers_blend), GL, 2009 },
242 { "GL_AMD_seamless_cubemap_per_texture", o(AMD_seamless_cubemap_per_texture), GL, 2009 },
243 { "GL_AMD_shader_stencil_export", o(ARB_shader_stencil_export), GL, 2009 },
244 { "GL_APPLE_object_purgeable", o(APPLE_object_purgeable), GL, 2006 },
245 { "GL_APPLE_packed_pixels", o(APPLE_packed_pixels), GL, 2002 },
246 { "GL_APPLE_vertex_array_object", o(APPLE_vertex_array_object), GL, 2002 },
247 { "GL_ATI_blend_equation_separate", o(EXT_blend_equation_separate), GL, 2003 },
248 { "GL_ATI_draw_buffers", o(dummy_true), GL, 2002 },
249 { "GL_ATI_envmap_bumpmap", o(ATI_envmap_bumpmap), GL, 2001 },
250 { "GL_ATI_separate_stencil", o(ATI_separate_stencil), GL, 2006 },
251 { "GL_ATI_texture_compression_3dc", o(ATI_texture_compression_3dc), GL, 2004 },
252 { "GL_ATI_texture_env_combine3", o(ATI_texture_env_combine3), GL, 2002 },
253 { "GL_ATI_texture_float", o(ARB_texture_float), GL, 2002 },
254 { "GL_ATI_texture_mirror_once", o(ATI_texture_mirror_once), GL, 2006 },
255 { "GL_IBM_multimode_draw_arrays", o(IBM_multimode_draw_arrays), GL, 1998 },
256 { "GL_IBM_rasterpos_clip", o(IBM_rasterpos_clip), GL, 1996 },
257 { "GL_IBM_texture_mirrored_repeat", o(dummy_true), GL, 1998 },
258 { "GL_INGR_blend_func_separate", o(EXT_blend_func_separate), GL, 1999 },
259 { "GL_MESA_pack_invert", o(MESA_pack_invert), GL, 2002 },
260 { "GL_MESA_resize_buffers", o(MESA_resize_buffers), GL, 1999 },
261 { "GL_MESA_texture_array", o(MESA_texture_array), GL, 2007 },
262 { "GL_MESA_texture_signed_rgba", o(EXT_texture_snorm), GL, 2009 },
263 { "GL_MESA_window_pos", o(ARB_window_pos), GL, 2000 },
264 { "GL_MESA_ycbcr_texture", o(MESA_ycbcr_texture), GL, 2002 },
265 { "GL_NV_blend_square", o(NV_blend_square), GL, 1999 },
266 { "GL_NV_depth_clamp", o(ARB_depth_clamp), GL, 2001 },
267 { "GL_NV_draw_buffers", o(dummy_true), ES2, 2011 },
268 { "GL_NV_fbo_color_attachments", o(EXT_framebuffer_object), ES2, 2010 },
269 { "GL_NV_fog_distance", o(NV_fog_distance), GL, 2001 },
270 { "GL_NV_fragment_program", o(NV_fragment_program), GL, 2001 },
271 { "GL_NV_fragment_program_option", o(NV_fragment_program_option), GL, 2005 },
272 { "GL_NV_light_max_exponent", o(NV_light_max_exponent), GL, 1999 },
273 { "GL_NV_packed_depth_stencil", o(EXT_packed_depth_stencil), GL, 2000 },
274 { "GL_NV_point_sprite", o(NV_point_sprite), GL, 2001 },
275 { "GL_NV_primitive_restart", o(NV_primitive_restart), GL, 2002 },
276 { "GL_NV_texgen_reflection", o(NV_texgen_reflection), GL, 1999 },
277 { "GL_NV_texture_barrier", o(NV_texture_barrier), GL, 2009 },
278 { "GL_NV_texture_env_combine4", o(NV_texture_env_combine4), GL, 1999 },
279 { "GL_NV_texture_rectangle", o(NV_texture_rectangle), GL, 2000 },
280 { "GL_NV_vertex_program1_1", o(NV_vertex_program1_1), GL, 2001 },
281 { "GL_NV_vertex_program", o(NV_vertex_program), GL, 2000 },
282 { "GL_S3_s3tc", o(S3_s3tc), GL, 1999 },
283 { "GL_SGIS_generate_mipmap", o(dummy_true), GL, 1997 },
284 { "GL_SGIS_texture_border_clamp", o(ARB_texture_border_clamp), GL, 1997 },
285 { "GL_SGIS_texture_edge_clamp", o(dummy_true), GL, 1997 },
286 { "GL_SGIS_texture_lod", o(SGIS_texture_lod), GL, 1997 },
287 { "GL_SUN_multi_draw_arrays", o(dummy_true), GL, 1999 },
288
289 { 0, 0, 0, 0 },
290 };
291
292
293 /**
294 * Given an extension name, lookup up the corresponding member of struct
295 * gl_extensions and return that member's offset (in bytes). If the name is
296 * not found in the \c extension_table, return 0.
297 *
298 * \param name Name of extension.
299 * \return Offset of member in struct gl_extensions.
300 */
301 static size_t
302 name_to_offset(const char* name)
303 {
304 const struct extension *i;
305
306 if (name == 0)
307 return 0;
308
309 for (i = extension_table; i->name != 0; ++i) {
310 if (strcmp(name, i->name) == 0)
311 return i->offset;
312 }
313
314 return 0;
315 }
316
317
318 /**
319 * \brief Extensions enabled by default.
320 *
321 * These extensions are enabled by _mesa_init_extensions().
322 *
323 * XXX: Should these defaults also apply to GLES?
324 */
325 static const size_t default_extensions[] = {
326 o(ARB_copy_buffer),
327 o(ARB_transpose_matrix),
328 o(ARB_window_pos),
329
330 o(EXT_compiled_vertex_array),
331 o(EXT_draw_range_elements),
332 o(EXT_packed_pixels),
333 o(EXT_rescale_normal),
334 o(EXT_separate_specular_color),
335 o(EXT_texture3D),
336
337 o(OES_standard_derivatives),
338
339 /* Vendor Extensions */
340 o(APPLE_packed_pixels),
341 o(IBM_multimode_draw_arrays),
342 o(IBM_rasterpos_clip),
343 o(NV_light_max_exponent),
344 o(NV_texgen_reflection),
345 o(SGIS_texture_lod),
346
347 0,
348 };
349
350
351 /**
352 * Enable all extensions suitable for a software-only renderer.
353 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
354 */
355 void
356 _mesa_enable_sw_extensions(struct gl_context *ctx)
357 {
358 /*ctx->Extensions.ARB_copy_buffer = GL_TRUE;*/
359 ctx->Extensions.ARB_depth_clamp = GL_TRUE;
360 ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
361 ctx->Extensions.ARB_draw_instanced = GL_TRUE;
362 ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
363 ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
364 #if FEATURE_ARB_fragment_program
365 ctx->Extensions.ARB_fragment_program = GL_TRUE;
366 ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
367 #endif
368 #if FEATURE_ARB_fragment_shader
369 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
370 #endif
371 #if FEATURE_ARB_framebuffer_object
372 ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
373 #endif
374 #if FEATURE_ARB_geometry_shader4 && 0
375 /* XXX re-enable when GLSL compiler again supports geometry shaders */
376 ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
377 #endif
378 ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
379 ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
380 ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
381 ctx->Extensions.ARB_point_sprite = GL_TRUE;
382 #if FEATURE_ARB_shader_objects
383 ctx->Extensions.ARB_shader_objects = GL_TRUE;
384 ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
385 #endif
386 #if FEATURE_ARB_shading_language_100
387 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
388 #endif
389 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
390 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
391 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
392 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
393 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
394 /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
395 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
396 ctx->Extensions.ARB_texture_rg = GL_TRUE;
397 ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
398 ctx->Extensions.ARB_texture_storage = GL_TRUE;
399 ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
400 #if FEATURE_ARB_vertex_program
401 ctx->Extensions.ARB_vertex_program = GL_TRUE;
402 #endif
403 #if FEATURE_ARB_vertex_shader
404 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
405 #endif
406 ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
407 #if FEATURE_APPLE_object_purgeable
408 ctx->Extensions.APPLE_object_purgeable = GL_TRUE;
409 #endif
410 ctx->Extensions.ATI_envmap_bumpmap = GL_TRUE;
411 ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
412 ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
413 ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
414 ctx->Extensions.ATI_separate_stencil = GL_TRUE;
415 ctx->Extensions.EXT_blend_color = GL_TRUE;
416 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
417 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
418 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
419 ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
420 ctx->Extensions.EXT_fog_coord = GL_TRUE;
421 #if FEATURE_EXT_framebuffer_object
422 ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
423 #endif
424 #if FEATURE_EXT_framebuffer_blit
425 ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
426 #endif
427 #if FEATURE_ARB_framebuffer_object
428 ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
429 #endif
430 ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
431 #if FEATURE_EXT_pixel_buffer_object
432 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
433 #endif
434 ctx->Extensions.EXT_point_parameters = GL_TRUE;
435 ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
436 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
437 ctx->Extensions.EXT_secondary_color = GL_TRUE;
438 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
439 ctx->Extensions.EXT_texture_array = GL_TRUE;
440 ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
441 ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
442 ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
443 ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
444 #if FEATURE_EXT_texture_sRGB
445 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
446 #endif
447 ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
448 /*ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;*/
449 ctx->Extensions.MESA_pack_invert = GL_TRUE;
450 ctx->Extensions.MESA_resize_buffers = GL_TRUE;
451 ctx->Extensions.MESA_texture_array = GL_TRUE;
452 ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
453 ctx->Extensions.NV_blend_square = GL_TRUE;
454 /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
455 ctx->Extensions.NV_point_sprite = GL_TRUE;
456 ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
457 ctx->Extensions.NV_texture_rectangle = GL_TRUE;
458 /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
459 #if FEATURE_NV_vertex_program
460 ctx->Extensions.NV_vertex_program = GL_TRUE;
461 ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
462 #endif
463 #if FEATURE_NV_fragment_program
464 ctx->Extensions.NV_fragment_program = GL_TRUE;
465 #endif
466 #if FEATURE_NV_fragment_program && FEATURE_ARB_fragment_program
467 ctx->Extensions.NV_fragment_program_option = GL_TRUE;
468 #endif
469 #if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
470 ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
471 #endif
472 #if FEATURE_texture_fxt1
473 _mesa_enable_extension(ctx, "GL_3DFX_texture_compression_FXT1");
474 #endif
475 #if FEATURE_texture_s3tc
476 if (ctx->Mesa_DXTn) {
477 _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
478 _mesa_enable_extension(ctx, "GL_S3_s3tc");
479 }
480 #endif
481 }
482
483
484 /**
485 * Enable all OpenGL 1.3 features and extensions.
486 * A convenience function to be called by drivers.
487 */
488 void
489 _mesa_enable_1_3_extensions(struct gl_context *ctx)
490 {
491 ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
492 ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
493 ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
494 ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
495 /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
496 }
497
498
499
500 /**
501 * Enable all OpenGL 1.4 features and extensions.
502 * A convenience function to be called by drivers.
503 */
504 void
505 _mesa_enable_1_4_extensions(struct gl_context *ctx)
506 {
507 ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
508 ctx->Extensions.ARB_window_pos = GL_TRUE;
509 ctx->Extensions.EXT_blend_color = GL_TRUE;
510 ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
511 ctx->Extensions.EXT_blend_minmax = GL_TRUE;
512 ctx->Extensions.EXT_fog_coord = GL_TRUE;
513 ctx->Extensions.EXT_point_parameters = GL_TRUE;
514 ctx->Extensions.EXT_secondary_color = GL_TRUE;
515 }
516
517
518 /**
519 * Enable all OpenGL 1.5 features and extensions.
520 * A convenience function to be called by drivers.
521 */
522 void
523 _mesa_enable_1_5_extensions(struct gl_context *ctx)
524 {
525 ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
526 }
527
528
529 /**
530 * Enable all OpenGL 2.0 features and extensions.
531 * A convenience function to be called by drivers.
532 */
533 void
534 _mesa_enable_2_0_extensions(struct gl_context *ctx)
535 {
536 #if FEATURE_ARB_fragment_shader
537 ctx->Extensions.ARB_fragment_shader = GL_TRUE;
538 #endif
539 ctx->Extensions.ARB_point_sprite = GL_TRUE;
540 ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
541 ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
542 #if FEATURE_ARB_shader_objects
543 ctx->Extensions.ARB_shader_objects = GL_TRUE;
544 #endif
545 #if FEATURE_ARB_shading_language_100
546 ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
547 #endif
548 ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
549 #if FEATURE_ARB_vertex_shader
550 ctx->Extensions.ARB_vertex_shader = GL_TRUE;
551 #endif
552 }
553
554
555 /**
556 * Enable all OpenGL 2.1 features and extensions.
557 * A convenience function to be called by drivers.
558 */
559 void
560 _mesa_enable_2_1_extensions(struct gl_context *ctx)
561 {
562 #if FEATURE_EXT_pixel_buffer_object
563 ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
564 #endif
565 #if FEATURE_EXT_texture_sRGB
566 ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
567 #endif
568 }
569
570
571 /**
572 * Either enable or disable the named extension.
573 * \return GL_TRUE for success, GL_FALSE if invalid extension name
574 */
575 static GLboolean
576 set_extension( struct gl_context *ctx, const char *name, GLboolean state )
577 {
578 size_t offset;
579
580 if (ctx->Extensions.String) {
581 /* The string was already queried - can't change it now! */
582 _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
583 return GL_FALSE;
584 }
585
586 offset = name_to_offset(name);
587 if (offset == 0) {
588 _mesa_problem(ctx, "Trying to enable/disable unknown extension %s",
589 name);
590 return GL_FALSE;
591 } else if (offset == o(dummy_true) && state == GL_FALSE) {
592 _mesa_problem(ctx, "Trying to disable a permanently enabled extension: "
593 "%s", name);
594 return GL_FALSE;
595 } else {
596 GLboolean *base = (GLboolean *) &ctx->Extensions;
597 base[offset] = state;
598 return GL_TRUE;
599 }
600 }
601
602
603 /**
604 * Enable the named extension.
605 * Typically called by drivers.
606 */
607 void
608 _mesa_enable_extension( struct gl_context *ctx, const char *name )
609 {
610 if (!set_extension(ctx, name, GL_TRUE))
611 _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
612 }
613
614
615 /**
616 * Disable the named extension.
617 * XXX is this really needed???
618 */
619 void
620 _mesa_disable_extension( struct gl_context *ctx, const char *name )
621 {
622 if (!set_extension(ctx, name, GL_FALSE))
623 _mesa_problem(ctx, "Trying to disable unknown extension: %s", name);
624 }
625
626
627 /**
628 * Test if the named extension is enabled in this context.
629 */
630 GLboolean
631 _mesa_extension_is_enabled( struct gl_context *ctx, const char *name )
632 {
633 size_t offset;
634 GLboolean *base;
635
636 if (name == 0)
637 return GL_FALSE;
638
639 offset = name_to_offset(name);
640 if (offset == 0)
641 return GL_FALSE;
642 base = (GLboolean *) &ctx->Extensions;
643 return base[offset];
644 }
645
646
647 /**
648 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
649 *
650 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
651 * enable or disable. The list is processed thus:
652 * - Enable recognized extension names that are prefixed with '+'.
653 * - Disable recognized extension names that are prefixed with '-'.
654 * - Enable recognized extension names that are not prefixed.
655 * - Collect unrecognized extension names in a new string.
656 *
657 * \return Space-separated list of unrecognized extension names (which must
658 * be freed). Does not return \c NULL.
659 */
660 static char *
661 get_extension_override( struct gl_context *ctx )
662 {
663 const char *env_const = _mesa_getenv("MESA_EXTENSION_OVERRIDE");
664 char *env;
665 char *ext;
666 char *extra_exts;
667 int len;
668
669 if (env_const == NULL) {
670 /* Return the empty string rather than NULL. This simplifies the logic
671 * of client functions. */
672 return calloc(4, sizeof(char));
673 }
674
675 /* extra_exts: List of unrecognized extensions. */
676 extra_exts = calloc(ALIGN(strlen(env_const) + 2, 4), sizeof(char));
677
678 /* Copy env_const because strtok() is destructive. */
679 env = strdup(env_const);
680 for (ext = strtok(env, " "); ext != NULL; ext = strtok(NULL, " ")) {
681 int enable;
682 int recognized;
683 switch (ext[0]) {
684 case '+':
685 enable = 1;
686 ++ext;
687 break;
688 case '-':
689 enable = 0;
690 ++ext;
691 break;
692 default:
693 enable = 1;
694 break;
695 }
696 recognized = set_extension(ctx, ext, enable);
697 if (!recognized) {
698 strcat(extra_exts, ext);
699 strcat(extra_exts, " ");
700 }
701 }
702
703 free(env);
704
705 /* Remove trailing space. */
706 len = strlen(extra_exts);
707 if (extra_exts[len - 1] == ' ')
708 extra_exts[len - 1] = '\0';
709
710 return extra_exts;
711 }
712
713
714 /**
715 * \brief Initialize extension tables and enable default extensions.
716 *
717 * This should be called during context initialization.
718 * Note: Sets gl_extensions.dummy_true to true.
719 */
720 void
721 _mesa_init_extensions( struct gl_context *ctx )
722 {
723 GLboolean *base = (GLboolean *) &ctx->Extensions;
724 GLboolean *sentinel = base + o(extension_sentinel);
725 GLboolean *i;
726 const size_t *j;
727
728 /* First, turn all extensions off. */
729 for (i = base; i != sentinel; ++i)
730 *i = GL_FALSE;
731
732 /* Then, selectively turn default extensions on. */
733 ctx->Extensions.dummy_true = GL_TRUE;
734 for (j = default_extensions; *j != 0; ++j)
735 base[*j] = GL_TRUE;
736 }
737
738
739 typedef unsigned short extension_index;
740
741
742 /**
743 * Compare two entries of the extensions table. Sorts first by year,
744 * then by name.
745 *
746 * Arguments are indices into extension_table.
747 */
748 static int
749 extension_compare(const void *p1, const void *p2)
750 {
751 extension_index i1 = * (const extension_index *) p1;
752 extension_index i2 = * (const extension_index *) p2;
753 const struct extension *e1 = &extension_table[i1];
754 const struct extension *e2 = &extension_table[i2];
755 int res;
756
757 res = (int)e1->year - (int)e2->year;
758
759 if (res == 0) {
760 res = strcmp(e1->name, e2->name);
761 }
762
763 return res;
764 }
765
766
767 /**
768 * Construct the GL_EXTENSIONS string. Called the first time that
769 * glGetString(GL_EXTENSIONS) is called.
770 */
771 GLubyte*
772 _mesa_make_extension_string(struct gl_context *ctx)
773 {
774 /* The extension string. */
775 char *exts = 0;
776 /* Length of extension string. */
777 size_t length = 0;
778 /* Number of extensions */
779 unsigned count;
780 /* Indices of the extensions sorted by year */
781 extension_index *extension_indices;
782 /* String of extra extensions. */
783 char *extra_extensions = get_extension_override(ctx);
784 GLboolean *base = (GLboolean *) &ctx->Extensions;
785 const struct extension *i;
786 unsigned j;
787 unsigned maxYear = ~0;
788
789 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
790 {
791 const char *env = getenv("MESA_EXTENSION_MAX_YEAR");
792 if (env) {
793 maxYear = atoi(env);
794 _mesa_debug(ctx, "Note: limiting GL extensions to %u or earlier\n",
795 maxYear);
796 }
797 }
798
799 /* Compute length of the extension string. */
800 count = 0;
801 for (i = extension_table; i->name != 0; ++i) {
802 if (base[i->offset] &&
803 i->year <= maxYear &&
804 (i->api_set & (1 << ctx->API))) {
805 length += strlen(i->name) + 1; /* +1 for space */
806 ++count;
807 }
808 }
809 if (extra_extensions != NULL)
810 length += 1 + strlen(extra_extensions); /* +1 for space */
811
812 exts = (char *) calloc(ALIGN(length + 1, 4), sizeof(char));
813 if (exts == NULL) {
814 free(extra_extensions);
815 return NULL;
816 }
817
818 extension_indices = malloc(count * sizeof(extension_index));
819 if (extension_indices == NULL) {
820 free(exts);
821 free(extra_extensions);
822 return NULL;
823 }
824
825 /* Sort extensions in chronological order because certain old applications (e.g.,
826 * Quake3 demo) store the extension list in a static size buffer so chronologically
827 * order ensure that the extensions that such applications expect will fit into
828 * that buffer.
829 */
830 j = 0;
831 for (i = extension_table; i->name != 0; ++i) {
832 if (base[i->offset] &&
833 i->year <= maxYear &&
834 (i->api_set & (1 << ctx->API))) {
835 extension_indices[j++] = i - extension_table;
836 }
837 }
838 assert(j == count);
839 qsort(extension_indices, count, sizeof *extension_indices, extension_compare);
840
841 /* Build the extension string.*/
842 for (j = 0; j < count; ++j) {
843 i = &extension_table[extension_indices[j]];
844 assert(base[i->offset] && (i->api_set & (1 << ctx->API)));
845 strcat(exts, i->name);
846 strcat(exts, " ");
847 }
848 free(extension_indices);
849 if (extra_extensions != 0) {
850 strcat(exts, extra_extensions);
851 free(extra_extensions);
852 }
853
854 return (GLubyte *) exts;
855 }
856
857 /**
858 * Return number of enabled extensions.
859 */
860 GLuint
861 _mesa_get_extension_count(struct gl_context *ctx)
862 {
863 GLboolean *base;
864 const struct extension *i;
865
866 /* only count once */
867 if (ctx->Extensions.Count != 0)
868 return ctx->Extensions.Count;
869
870 base = (GLboolean *) &ctx->Extensions;
871 for (i = extension_table; i->name != 0; ++i) {
872 if (base[i->offset]) {
873 ctx->Extensions.Count++;
874 }
875 }
876 return ctx->Extensions.Count;
877 }
878
879 /**
880 * Return name of i-th enabled extension
881 */
882 const GLubyte *
883 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
884 {
885 const GLboolean *base;
886 size_t n;
887 const struct extension *i;
888
889 if (index < 0)
890 return NULL;
891
892 base = (GLboolean*) &ctx->Extensions;
893 n = 0;
894 for (i = extension_table; i->name != 0; ++i) {
895 if (n == index && base[i->offset]) {
896 return (GLubyte*) i->name;
897 } else if (base[i->offset]) {
898 ++n;
899 }
900 }
901
902 return NULL;
903 }