2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 * Copyright (C) 2009 VMware, Inc. 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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
29 * \brief Extension handling
36 #include "extensions.h"
40 struct gl_extensions _mesa_extension_override_enables
;
41 struct gl_extensions _mesa_extension_override_disables
;
42 static char *extra_extensions
= NULL
;
43 static char *cant_disable_extensions
= NULL
;
47 * Given a member \c x of struct gl_extensions, return offset of
50 #define o(x) offsetof(struct gl_extensions, x)
54 * \brief Table of supported OpenGL extensions for all API's.
56 const struct extension extension_table
[] = {
57 #define EXT(name_str, driver_cap, gll_ver, glc_ver, gles_ver, gles2_ver, yyyy) \
58 { .name = "GL_" #name_str, .offset = o(driver_cap), \
60 [API_OPENGL_COMPAT] = gll_ver, \
61 [API_OPENGL_CORE] = glc_ver, \
62 [API_OPENGLES] = gles_ver, \
63 [API_OPENGLES2] = gles2_ver, \
67 #include "extensions_table.h"
73 * Given an extension name, lookup up the corresponding member of struct
74 * gl_extensions and return that member's offset (in bytes). If the name is
75 * not found in the \c extension_table, return 0.
77 * \param name Name of extension.
78 * \return Offset of member in struct gl_extensions.
81 name_to_offset(const char* name
)
88 for (i
= 0; i
< ARRAY_SIZE(extension_table
); ++i
) {
89 if (strcmp(name
, extension_table
[i
].name
) == 0)
90 return extension_table
[i
].offset
;
97 * Overrides extensions in \c ctx based on the values in
98 * _mesa_extension_override_enables and _mesa_extension_override_disables.
101 override_extensions_in_context(struct gl_context
*ctx
)
104 const GLboolean
*enables
=
105 (GLboolean
*) &_mesa_extension_override_enables
;
106 const GLboolean
*disables
=
107 (GLboolean
*) &_mesa_extension_override_disables
;
108 GLboolean
*ctx_ext
= (GLboolean
*)&ctx
->Extensions
;
110 for (i
= 0; i
< ARRAY_SIZE(extension_table
); ++i
) {
111 size_t offset
= extension_table
[i
].offset
;
113 assert(!enables
[offset
] || !disables
[offset
]);
114 if (enables
[offset
]) {
116 } else if (disables
[offset
]) {
124 * Enable all extensions suitable for a software-only renderer.
125 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
128 _mesa_enable_sw_extensions(struct gl_context
*ctx
)
130 ctx
->Extensions
.ARB_depth_clamp
= GL_TRUE
;
131 ctx
->Extensions
.ARB_depth_texture
= GL_TRUE
;
132 ctx
->Extensions
.ARB_draw_elements_base_vertex
= GL_TRUE
;
133 ctx
->Extensions
.ARB_draw_instanced
= GL_TRUE
;
134 ctx
->Extensions
.ARB_explicit_attrib_location
= GL_TRUE
;
135 ctx
->Extensions
.ARB_fragment_coord_conventions
= GL_TRUE
;
136 ctx
->Extensions
.ARB_fragment_program
= GL_TRUE
;
137 ctx
->Extensions
.ARB_fragment_program_shadow
= GL_TRUE
;
138 ctx
->Extensions
.ARB_fragment_shader
= GL_TRUE
;
139 ctx
->Extensions
.ARB_framebuffer_object
= GL_TRUE
;
140 ctx
->Extensions
.ARB_half_float_vertex
= GL_TRUE
;
141 ctx
->Extensions
.ARB_map_buffer_range
= GL_TRUE
;
142 ctx
->Extensions
.ARB_occlusion_query
= GL_TRUE
;
143 ctx
->Extensions
.ARB_occlusion_query2
= GL_TRUE
;
144 ctx
->Extensions
.ARB_point_sprite
= GL_TRUE
;
145 ctx
->Extensions
.ARB_shadow
= GL_TRUE
;
146 ctx
->Extensions
.ARB_texture_border_clamp
= GL_TRUE
;
147 ctx
->Extensions
.ARB_texture_compression_bptc
= GL_TRUE
;
148 ctx
->Extensions
.ARB_texture_cube_map
= GL_TRUE
;
149 ctx
->Extensions
.ARB_texture_env_combine
= GL_TRUE
;
150 ctx
->Extensions
.ARB_texture_env_crossbar
= GL_TRUE
;
151 ctx
->Extensions
.ARB_texture_env_dot3
= GL_TRUE
;
152 #ifdef TEXTURE_FLOAT_ENABLED
153 ctx
->Extensions
.ARB_texture_float
= GL_TRUE
;
155 ctx
->Extensions
.ARB_texture_mirror_clamp_to_edge
= GL_TRUE
;
156 ctx
->Extensions
.ARB_texture_non_power_of_two
= GL_TRUE
;
157 ctx
->Extensions
.ARB_texture_rg
= GL_TRUE
;
158 ctx
->Extensions
.ARB_texture_compression_rgtc
= GL_TRUE
;
159 ctx
->Extensions
.ARB_vertex_program
= GL_TRUE
;
160 ctx
->Extensions
.ARB_vertex_shader
= GL_TRUE
;
161 ctx
->Extensions
.ARB_sync
= GL_TRUE
;
162 ctx
->Extensions
.APPLE_object_purgeable
= GL_TRUE
;
163 ctx
->Extensions
.ATI_fragment_shader
= GL_TRUE
;
164 ctx
->Extensions
.ATI_texture_compression_3dc
= GL_TRUE
;
165 ctx
->Extensions
.ATI_texture_env_combine3
= GL_TRUE
;
166 ctx
->Extensions
.ATI_texture_mirror_once
= GL_TRUE
;
167 ctx
->Extensions
.ATI_separate_stencil
= GL_TRUE
;
168 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
169 ctx
->Extensions
.EXT_blend_equation_separate
= GL_TRUE
;
170 ctx
->Extensions
.EXT_blend_func_separate
= GL_TRUE
;
171 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
172 ctx
->Extensions
.EXT_depth_bounds_test
= GL_TRUE
;
173 ctx
->Extensions
.EXT_draw_buffers2
= GL_TRUE
;
174 ctx
->Extensions
.EXT_pixel_buffer_object
= GL_TRUE
;
175 ctx
->Extensions
.EXT_point_parameters
= GL_TRUE
;
176 ctx
->Extensions
.EXT_provoking_vertex
= GL_TRUE
;
177 ctx
->Extensions
.EXT_stencil_two_side
= GL_TRUE
;
178 ctx
->Extensions
.EXT_texture_array
= GL_TRUE
;
179 ctx
->Extensions
.EXT_texture_compression_latc
= GL_TRUE
;
180 ctx
->Extensions
.EXT_texture_env_dot3
= GL_TRUE
;
181 ctx
->Extensions
.EXT_texture_filter_anisotropic
= GL_TRUE
;
182 ctx
->Extensions
.EXT_texture_mirror_clamp
= GL_TRUE
;
183 ctx
->Extensions
.EXT_texture_shared_exponent
= GL_TRUE
;
184 ctx
->Extensions
.EXT_texture_sRGB
= GL_TRUE
;
185 ctx
->Extensions
.EXT_texture_sRGB_decode
= GL_TRUE
;
186 ctx
->Extensions
.EXT_texture_swizzle
= GL_TRUE
;
187 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
188 ctx
->Extensions
.EXT_vertex_array_bgra
= GL_TRUE
;
189 ctx
->Extensions
.MESA_pack_invert
= GL_TRUE
;
190 ctx
->Extensions
.MESA_ycbcr_texture
= GL_TRUE
;
191 ctx
->Extensions
.NV_conditional_render
= GL_TRUE
;
192 ctx
->Extensions
.NV_point_sprite
= GL_TRUE
;
193 ctx
->Extensions
.NV_texture_env_combine4
= GL_TRUE
;
194 ctx
->Extensions
.NV_texture_rectangle
= GL_TRUE
;
195 ctx
->Extensions
.EXT_gpu_program_parameters
= GL_TRUE
;
196 ctx
->Extensions
.OES_standard_derivatives
= GL_TRUE
;
197 ctx
->Extensions
.TDFX_texture_compression_FXT1
= GL_TRUE
;
198 if (ctx
->Mesa_DXTn
) {
199 ctx
->Extensions
.ANGLE_texture_compression_dxt
= GL_TRUE
;
200 ctx
->Extensions
.EXT_texture_compression_s3tc
= GL_TRUE
;
205 * Either enable or disable the named extension.
206 * \return offset of extensions withint `ext' or 0 if extension is not known
209 set_extension(struct gl_extensions
*ext
, const char *name
, GLboolean state
)
213 offset
= name_to_offset(name
);
214 if (offset
!= 0 && (offset
!= o(dummy_true
) || state
!= GL_FALSE
)) {
215 ((GLboolean
*) ext
)[offset
] = state
;
222 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
224 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
225 * enable or disable. The list is processed thus:
226 * - Enable recognized extension names that are prefixed with '+'.
227 * - Disable recognized extension names that are prefixed with '-'.
228 * - Enable recognized extension names that are not prefixed.
229 * - Collect unrecognized extension names in a new string.
231 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
232 * _mesa_one_time_init_extension_overrides. We just use the results of that
233 * parsing in this function.
235 * \return Space-separated list of unrecognized extension names (which must
236 * be freed). Does not return \c NULL.
239 get_extension_override( struct gl_context
*ctx
)
241 override_extensions_in_context(ctx
);
243 if (cant_disable_extensions
!= NULL
) {
245 "Trying to disable permanently enabled extensions: %s",
246 cant_disable_extensions
);
249 if (extra_extensions
== NULL
) {
250 return calloc(1, sizeof(char));
252 _mesa_problem(ctx
, "Trying to enable unknown extensions: %s",
254 return strdup(extra_extensions
);
260 * \brief Free extra_extensions and cant_disable_extensions strings
262 * These strings are allocated early during the first context creation by
263 * _mesa_one_time_init_extension_overrides.
266 free_unknown_extensions_strings(void)
268 free(extra_extensions
);
269 free(cant_disable_extensions
);
274 * \brief Initialize extension override tables.
276 * This should be called one time early during first context initialization.
279 _mesa_one_time_init_extension_overrides(void)
281 const char *env_const
= getenv("MESA_EXTENSION_OVERRIDE");
287 atexit(free_unknown_extensions_strings
);
289 memset(&_mesa_extension_override_enables
, 0, sizeof(struct gl_extensions
));
290 memset(&_mesa_extension_override_disables
, 0, sizeof(struct gl_extensions
));
292 if (env_const
== NULL
) {
296 /* extra_exts: List of unrecognized extensions. */
297 extra_extensions
= calloc(ALIGN(strlen(env_const
) + 2, 4), sizeof(char));
298 cant_disable_extensions
= calloc(ALIGN(strlen(env_const
) + 2, 4), sizeof(char));
300 /* Copy env_const because strtok() is destructive. */
301 env
= strdup(env_const
);
303 if (env
== NULL
|| extra_extensions
== NULL
||
304 cant_disable_extensions
== NULL
) {
306 free(extra_extensions
);
307 free(cant_disable_extensions
);
311 for (ext
= strtok(env
, " "); ext
!= NULL
; ext
= strtok(NULL
, " ")) {
328 offset
= set_extension(&_mesa_extension_override_enables
, ext
, enable
);
329 if (offset
!= 0 && (offset
!= o(dummy_true
) || enable
!= GL_FALSE
)) {
330 ((GLboolean
*) &_mesa_extension_override_disables
)[offset
] = !enable
;
338 strcat(extra_extensions
, ext
);
339 strcat(extra_extensions
, " ");
340 } else if (offset
== o(dummy_true
)) {
341 strcat(cant_disable_extensions
, ext
);
342 strcat(cant_disable_extensions
, " ");
349 /* Remove trailing space, and free if unused. */
350 len
= strlen(extra_extensions
);
352 free(extra_extensions
);
353 extra_extensions
= NULL
;
354 } else if (extra_extensions
[len
- 1] == ' ') {
355 extra_extensions
[len
- 1] = '\0';
357 len
= strlen(cant_disable_extensions
);
359 free(cant_disable_extensions
);
360 cant_disable_extensions
= NULL
;
361 } else if (cant_disable_extensions
[len
- 1] == ' ') {
362 cant_disable_extensions
[len
- 1] = '\0';
368 * \brief Initialize extension tables and enable default extensions.
370 * This should be called during context initialization.
371 * Note: Sets gl_extensions.dummy_true to true.
374 _mesa_init_extensions(struct gl_extensions
*extensions
)
376 GLboolean
*base
= (GLboolean
*) extensions
;
377 GLboolean
*sentinel
= base
+ o(extension_sentinel
);
380 /* First, turn all extensions off. */
381 for (i
= base
; i
!= sentinel
; ++i
)
384 /* Then, selectively turn default extensions on. */
385 extensions
->dummy_true
= GL_TRUE
;
386 extensions
->EXT_texture3D
= GL_TRUE
;
390 typedef unsigned short extension_index
;
394 * Given an extension enum, return whether or not the extension is supported
395 * dependent on the following factors:
396 * There's driver support and the OpenGL/ES version is at least that
397 * specified in the extension_table.
400 _mesa_extension_supported(const struct gl_context
*ctx
, extension_index i
)
402 const bool *base
= (bool *) &ctx
->Extensions
;
403 const struct extension
*ext
= extension_table
+ i
;
405 return (ctx
->Version
>= ext
->version
[ctx
->API
]) && base
[ext
->offset
];
409 * Compare two entries of the extensions table. Sorts first by year,
412 * Arguments are indices into extension_table.
415 extension_compare(const void *p1
, const void *p2
)
417 extension_index i1
= * (const extension_index
*) p1
;
418 extension_index i2
= * (const extension_index
*) p2
;
419 const struct extension
*e1
= &extension_table
[i1
];
420 const struct extension
*e2
= &extension_table
[i2
];
423 res
= (int)e1
->year
- (int)e2
->year
;
426 res
= strcmp(e1
->name
, e2
->name
);
434 * Construct the GL_EXTENSIONS string. Called the first time that
435 * glGetString(GL_EXTENSIONS) is called.
438 _mesa_make_extension_string(struct gl_context
*ctx
)
440 /* The extension string. */
442 /* Length of extension string. */
444 /* Number of extensions */
446 /* Indices of the extensions sorted by year */
447 extension_index
*extension_indices
;
448 /* String of extra extensions. */
449 char *extra_extensions
= get_extension_override(ctx
);
452 unsigned maxYear
= ~0;
454 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
456 const char *env
= getenv("MESA_EXTENSION_MAX_YEAR");
459 _mesa_debug(ctx
, "Note: limiting GL extensions to %u or earlier\n",
464 /* Compute length of the extension string. */
466 for (k
= 0; k
< ARRAY_SIZE(extension_table
); ++k
) {
467 const struct extension
*i
= extension_table
+ k
;
469 if (i
->year
<= maxYear
&&
470 _mesa_extension_supported(ctx
, k
)) {
471 length
+= strlen(i
->name
) + 1; /* +1 for space */
475 if (extra_extensions
!= NULL
)
476 length
+= 1 + strlen(extra_extensions
); /* +1 for space */
478 exts
= calloc(ALIGN(length
+ 1, 4), sizeof(char));
480 free(extra_extensions
);
484 extension_indices
= malloc(count
* sizeof(extension_index
));
485 if (extension_indices
== NULL
) {
487 free(extra_extensions
);
491 /* Sort extensions in chronological order because certain old applications
492 * (e.g., Quake3 demo) store the extension list in a static size buffer so
493 * chronologically order ensure that the extensions that such applications
494 * expect will fit into that buffer.
497 for (k
= 0; k
< ARRAY_SIZE(extension_table
); ++k
) {
498 if (extension_table
[k
].year
<= maxYear
&&
499 _mesa_extension_supported(ctx
, k
)) {
500 extension_indices
[j
++] = k
;
504 qsort(extension_indices
, count
,
505 sizeof *extension_indices
, extension_compare
);
507 /* Build the extension string.*/
508 for (j
= 0; j
< count
; ++j
) {
509 const struct extension
*i
= &extension_table
[extension_indices
[j
]];
510 assert(_mesa_extension_supported(ctx
, extension_indices
[j
]));
511 strcat(exts
, i
->name
);
514 free(extension_indices
);
515 if (extra_extensions
!= 0) {
516 strcat(exts
, extra_extensions
);
517 free(extra_extensions
);
520 return (GLubyte
*) exts
;
524 * Return number of enabled extensions.
527 _mesa_get_extension_count(struct gl_context
*ctx
)
531 /* only count once */
532 if (ctx
->Extensions
.Count
!= 0)
533 return ctx
->Extensions
.Count
;
535 for (k
= 0; k
< ARRAY_SIZE(extension_table
); ++k
) {
536 if (_mesa_extension_supported(ctx
, k
))
537 ctx
->Extensions
.Count
++;
539 return ctx
->Extensions
.Count
;
543 * Return name of i-th enabled extension
546 _mesa_get_enabled_extension(struct gl_context
*ctx
, GLuint index
)
551 for (i
= 0; i
< ARRAY_SIZE(extension_table
); ++i
) {
552 if (_mesa_extension_supported(ctx
, i
)) {
554 return (const GLubyte
*) extension_table
[i
].name
;