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
;
46 * Given a member \c x of struct gl_extensions, return offset of
49 #define o(x) offsetof(struct gl_extensions, x)
51 static bool disabled_extensions
[MESA_EXTENSION_COUNT
];
54 * Given an extension name, lookup up the corresponding member of struct
55 * gl_extensions and return that member's index. If the name is
56 * not found in the \c _mesa_extension_table, return -1.
58 * \param name Name of extension.
59 * \return Index of member in struct gl_extensions.
62 name_to_index(const char* name
)
69 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
70 if (strcmp(name
, _mesa_extension_table
[i
].name
) == 0)
78 * Overrides extensions in \c ctx based on the values in
79 * _mesa_extension_override_enables and _mesa_extension_override_disables.
82 override_extensions_in_context(struct gl_context
*ctx
)
85 const GLboolean
*enables
=
86 (GLboolean
*) &_mesa_extension_override_enables
;
87 const GLboolean
*disables
=
88 (GLboolean
*) &_mesa_extension_override_disables
;
89 GLboolean
*ctx_ext
= (GLboolean
*)&ctx
->Extensions
;
91 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
92 size_t offset
= _mesa_extension_table
[i
].offset
;
94 assert(!enables
[offset
] || !disables
[offset
]);
95 if (enables
[offset
]) {
97 } else if (disables
[offset
]) {
105 * Enable all extensions suitable for a software-only renderer.
106 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
109 _mesa_enable_sw_extensions(struct gl_context
*ctx
)
111 ctx
->Extensions
.ARB_depth_clamp
= GL_TRUE
;
112 ctx
->Extensions
.ARB_depth_texture
= GL_TRUE
;
113 ctx
->Extensions
.ARB_draw_elements_base_vertex
= GL_TRUE
;
114 ctx
->Extensions
.ARB_draw_instanced
= GL_TRUE
;
115 ctx
->Extensions
.ARB_explicit_attrib_location
= GL_TRUE
;
116 ctx
->Extensions
.ARB_fragment_coord_conventions
= GL_TRUE
;
117 ctx
->Extensions
.ARB_fragment_program
= GL_TRUE
;
118 ctx
->Extensions
.ARB_fragment_program_shadow
= GL_TRUE
;
119 ctx
->Extensions
.ARB_fragment_shader
= GL_TRUE
;
120 ctx
->Extensions
.ARB_framebuffer_object
= GL_TRUE
;
121 ctx
->Extensions
.ARB_half_float_vertex
= GL_TRUE
;
122 ctx
->Extensions
.ARB_map_buffer_range
= GL_TRUE
;
123 ctx
->Extensions
.ARB_occlusion_query
= GL_TRUE
;
124 ctx
->Extensions
.ARB_occlusion_query2
= GL_TRUE
;
125 ctx
->Extensions
.ARB_point_sprite
= GL_TRUE
;
126 ctx
->Extensions
.ARB_shadow
= GL_TRUE
;
127 ctx
->Extensions
.ARB_texture_border_clamp
= GL_TRUE
;
128 ctx
->Extensions
.ARB_texture_compression_bptc
= GL_TRUE
;
129 ctx
->Extensions
.ARB_texture_cube_map
= GL_TRUE
;
130 ctx
->Extensions
.ARB_texture_env_combine
= GL_TRUE
;
131 ctx
->Extensions
.ARB_texture_env_crossbar
= GL_TRUE
;
132 ctx
->Extensions
.ARB_texture_env_dot3
= GL_TRUE
;
133 #ifdef TEXTURE_FLOAT_ENABLED
134 ctx
->Extensions
.ARB_texture_float
= GL_TRUE
;
136 ctx
->Extensions
.ARB_texture_mirror_clamp_to_edge
= GL_TRUE
;
137 ctx
->Extensions
.ARB_texture_non_power_of_two
= GL_TRUE
;
138 ctx
->Extensions
.ARB_texture_rg
= GL_TRUE
;
139 ctx
->Extensions
.ARB_texture_compression_rgtc
= GL_TRUE
;
140 ctx
->Extensions
.ARB_vertex_program
= GL_TRUE
;
141 ctx
->Extensions
.ARB_vertex_shader
= GL_TRUE
;
142 ctx
->Extensions
.ARB_sync
= GL_TRUE
;
143 ctx
->Extensions
.APPLE_object_purgeable
= GL_TRUE
;
144 ctx
->Extensions
.ATI_fragment_shader
= GL_TRUE
;
145 ctx
->Extensions
.ATI_texture_compression_3dc
= GL_TRUE
;
146 ctx
->Extensions
.ATI_texture_env_combine3
= GL_TRUE
;
147 ctx
->Extensions
.ATI_texture_mirror_once
= GL_TRUE
;
148 ctx
->Extensions
.ATI_separate_stencil
= GL_TRUE
;
149 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
150 ctx
->Extensions
.EXT_blend_equation_separate
= GL_TRUE
;
151 ctx
->Extensions
.EXT_blend_func_separate
= GL_TRUE
;
152 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
153 ctx
->Extensions
.EXT_depth_bounds_test
= GL_TRUE
;
154 ctx
->Extensions
.EXT_draw_buffers2
= GL_TRUE
;
155 ctx
->Extensions
.EXT_pixel_buffer_object
= GL_TRUE
;
156 ctx
->Extensions
.EXT_point_parameters
= GL_TRUE
;
157 ctx
->Extensions
.EXT_provoking_vertex
= GL_TRUE
;
158 ctx
->Extensions
.EXT_stencil_two_side
= GL_TRUE
;
159 ctx
->Extensions
.EXT_texture_array
= GL_TRUE
;
160 ctx
->Extensions
.EXT_texture_compression_latc
= GL_TRUE
;
161 ctx
->Extensions
.EXT_texture_env_dot3
= GL_TRUE
;
162 ctx
->Extensions
.EXT_texture_filter_anisotropic
= GL_TRUE
;
163 ctx
->Extensions
.EXT_texture_mirror_clamp
= GL_TRUE
;
164 ctx
->Extensions
.EXT_texture_shared_exponent
= GL_TRUE
;
165 ctx
->Extensions
.EXT_texture_sRGB
= GL_TRUE
;
166 ctx
->Extensions
.EXT_texture_sRGB_decode
= GL_TRUE
;
167 ctx
->Extensions
.EXT_texture_swizzle
= GL_TRUE
;
168 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
169 ctx
->Extensions
.EXT_vertex_array_bgra
= GL_TRUE
;
170 ctx
->Extensions
.MESA_pack_invert
= GL_TRUE
;
171 ctx
->Extensions
.MESA_ycbcr_texture
= GL_TRUE
;
172 ctx
->Extensions
.NV_conditional_render
= GL_TRUE
;
173 ctx
->Extensions
.NV_point_sprite
= GL_TRUE
;
174 ctx
->Extensions
.NV_texture_env_combine4
= GL_TRUE
;
175 ctx
->Extensions
.NV_texture_rectangle
= GL_TRUE
;
176 ctx
->Extensions
.EXT_gpu_program_parameters
= GL_TRUE
;
177 ctx
->Extensions
.OES_standard_derivatives
= GL_TRUE
;
178 ctx
->Extensions
.TDFX_texture_compression_FXT1
= GL_TRUE
;
179 if (ctx
->Mesa_DXTn
) {
180 ctx
->Extensions
.ANGLE_texture_compression_dxt
= GL_TRUE
;
181 ctx
->Extensions
.EXT_texture_compression_s3tc
= GL_TRUE
;
186 * Either enable or disable the named extension.
187 * \return offset of extensions withint `ext' or 0 if extension is not known
190 set_extension(struct gl_extensions
*ext
, int i
, GLboolean state
)
194 offset
= i
< 0 ? 0 : _mesa_extension_table
[i
].offset
;
195 if (offset
!= 0 && (offset
!= o(dummy_true
) || state
!= GL_FALSE
)) {
196 ((GLboolean
*) ext
)[offset
] = state
;
203 * \brief Apply the \c MESA_EXTENSION_OVERRIDE environment variable.
205 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
206 * enable or disable. The list is processed thus:
207 * - Enable recognized extension names that are prefixed with '+'.
208 * - Disable recognized extension names that are prefixed with '-'.
209 * - Enable recognized extension names that are not prefixed.
210 * - Collect unrecognized extension names in a new string.
212 * \c MESA_EXTENSION_OVERRIDE was previously parsed during
213 * _mesa_one_time_init_extension_overrides. We just use the results of that
214 * parsing in this function.
216 * \return Space-separated list of unrecognized extension names (which must
217 * be freed). Does not return \c NULL.
220 get_extension_override( struct gl_context
*ctx
)
222 override_extensions_in_context(ctx
);
224 if (extra_extensions
== NULL
) {
225 return calloc(1, sizeof(char));
227 _mesa_problem(ctx
, "Trying to enable unknown extensions: %s",
229 return strdup(extra_extensions
);
235 * \brief Free extra_extensions string
237 * These strings are allocated early during the first context creation by
238 * _mesa_one_time_init_extension_overrides.
241 free_unknown_extensions_strings(void)
243 free(extra_extensions
);
248 * \brief Initialize extension override tables.
250 * This should be called one time early during first context initialization.
253 _mesa_one_time_init_extension_overrides(void)
255 const char *env_const
= getenv("MESA_EXTENSION_OVERRIDE");
261 atexit(free_unknown_extensions_strings
);
263 memset(&_mesa_extension_override_enables
, 0, sizeof(struct gl_extensions
));
264 memset(&_mesa_extension_override_disables
, 0, sizeof(struct gl_extensions
));
266 if (env_const
== NULL
) {
270 /* extra_exts: List of unrecognized extensions. */
271 extra_extensions
= calloc(ALIGN(strlen(env_const
) + 2, 4), sizeof(char));
273 /* Copy env_const because strtok() is destructive. */
274 env
= strdup(env_const
);
277 extra_extensions
== NULL
) {
279 free(extra_extensions
);
283 for (ext
= strtok(env
, " "); ext
!= NULL
; ext
= strtok(NULL
, " ")) {
301 i
= name_to_index(ext
);
302 offset
= set_extension(&_mesa_extension_override_enables
, i
, enable
);
303 if (offset
!= 0 && (offset
!= o(dummy_true
) || enable
!= GL_FALSE
)) {
304 ((GLboolean
*) &_mesa_extension_override_disables
)[offset
] = !enable
;
311 disabled_extensions
[i
] = !enable
;
313 if (!recognized
&& enable
) {
314 strcat(extra_extensions
, ext
);
315 strcat(extra_extensions
, " ");
321 /* Remove trailing space, and free if unused. */
322 len
= strlen(extra_extensions
);
324 free(extra_extensions
);
325 extra_extensions
= NULL
;
326 } else if (extra_extensions
[len
- 1] == ' ') {
327 extra_extensions
[len
- 1] = '\0';
333 * \brief Initialize extension tables and enable default extensions.
335 * This should be called during context initialization.
336 * Note: Sets gl_extensions.dummy_true to true.
339 _mesa_init_extensions(struct gl_extensions
*extensions
)
341 GLboolean
*base
= (GLboolean
*) extensions
;
342 GLboolean
*sentinel
= base
+ o(extension_sentinel
);
345 /* First, turn all extensions off. */
346 for (i
= base
; i
!= sentinel
; ++i
)
349 /* Then, selectively turn default extensions on. */
350 extensions
->dummy_true
= GL_TRUE
;
354 typedef unsigned short extension_index
;
358 * Given an extension enum, return whether or not the extension is supported
359 * dependent on the following factors:
360 * There's driver support and the OpenGL/ES version is at least that
361 * specified in the _mesa_extension_table.
364 _mesa_extension_supported(const struct gl_context
*ctx
, extension_index i
)
366 const bool *base
= (bool *) &ctx
->Extensions
;
367 const struct mesa_extension
*ext
= _mesa_extension_table
+ i
;
369 return !disabled_extensions
[i
] &&
370 (ctx
->Version
>= ext
->version
[ctx
->API
]) && base
[ext
->offset
];
374 * Compare two entries of the extensions table. Sorts first by year,
377 * Arguments are indices into _mesa_extension_table.
380 extension_compare(const void *p1
, const void *p2
)
382 extension_index i1
= * (const extension_index
*) p1
;
383 extension_index i2
= * (const extension_index
*) p2
;
384 const struct mesa_extension
*e1
= &_mesa_extension_table
[i1
];
385 const struct mesa_extension
*e2
= &_mesa_extension_table
[i2
];
388 res
= (int)e1
->year
- (int)e2
->year
;
391 res
= strcmp(e1
->name
, e2
->name
);
399 * Construct the GL_EXTENSIONS string. Called the first time that
400 * glGetString(GL_EXTENSIONS) is called.
403 _mesa_make_extension_string(struct gl_context
*ctx
)
405 /* The extension string. */
407 /* Length of extension string. */
409 /* Number of extensions */
411 /* Indices of the extensions sorted by year */
412 extension_index
*extension_indices
;
413 /* String of extra extensions. */
414 char *extra_extensions
= get_extension_override(ctx
);
417 unsigned maxYear
= ~0;
419 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
421 const char *env
= getenv("MESA_EXTENSION_MAX_YEAR");
424 _mesa_debug(ctx
, "Note: limiting GL extensions to %u or earlier\n",
429 /* Compute length of the extension string. */
431 for (k
= 0; k
< MESA_EXTENSION_COUNT
; ++k
) {
432 const struct mesa_extension
*i
= _mesa_extension_table
+ k
;
434 if (i
->year
<= maxYear
&&
435 _mesa_extension_supported(ctx
, k
)) {
436 length
+= strlen(i
->name
) + 1; /* +1 for space */
440 if (extra_extensions
!= NULL
)
441 length
+= 1 + strlen(extra_extensions
); /* +1 for space */
443 exts
= calloc(ALIGN(length
+ 1, 4), sizeof(char));
445 free(extra_extensions
);
449 extension_indices
= malloc(count
* sizeof(extension_index
));
450 if (extension_indices
== NULL
) {
452 free(extra_extensions
);
456 /* Sort extensions in chronological order because certain old applications
457 * (e.g., Quake3 demo) store the extension list in a static size buffer so
458 * chronologically order ensure that the extensions that such applications
459 * expect will fit into that buffer.
462 for (k
= 0; k
< MESA_EXTENSION_COUNT
; ++k
) {
463 if (_mesa_extension_table
[k
].year
<= maxYear
&&
464 _mesa_extension_supported(ctx
, k
)) {
465 extension_indices
[j
++] = k
;
469 qsort(extension_indices
, count
,
470 sizeof *extension_indices
, extension_compare
);
472 /* Build the extension string.*/
473 for (j
= 0; j
< count
; ++j
) {
474 const struct mesa_extension
*i
= &_mesa_extension_table
[extension_indices
[j
]];
475 assert(_mesa_extension_supported(ctx
, extension_indices
[j
]));
476 strcat(exts
, i
->name
);
479 free(extension_indices
);
480 if (extra_extensions
!= 0) {
481 strcat(exts
, extra_extensions
);
482 free(extra_extensions
);
485 return (GLubyte
*) exts
;
489 * Return number of enabled extensions.
492 _mesa_get_extension_count(struct gl_context
*ctx
)
496 /* only count once */
497 if (ctx
->Extensions
.Count
!= 0)
498 return ctx
->Extensions
.Count
;
500 for (k
= 0; k
< MESA_EXTENSION_COUNT
; ++k
) {
501 if (_mesa_extension_supported(ctx
, k
))
502 ctx
->Extensions
.Count
++;
504 return ctx
->Extensions
.Count
;
508 * Return name of i-th enabled extension
511 _mesa_get_enabled_extension(struct gl_context
*ctx
, GLuint index
)
516 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
517 if (_mesa_extension_supported(ctx
, i
)) {
519 return (const GLubyte
*) _mesa_extension_table
[i
].name
;