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 *unrecognized_extensions
= NULL
;
46 * Given a member \c x of struct gl_extensions, return offset of
49 #define o(x) offsetof(struct gl_extensions, x)
52 * Given an extension name, lookup up the corresponding member of struct
53 * gl_extensions and return that member's index. If the name is
54 * not found in the \c _mesa_extension_table, return -1.
56 * \param name Name of extension.
57 * \return Index of member in struct gl_extensions.
60 name_to_index(const char* name
)
67 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
68 if (strcmp(name
, _mesa_extension_table
[i
].name
) == 0)
76 * Overrides extensions in \c ctx based on the values in
77 * _mesa_extension_override_enables and _mesa_extension_override_disables.
80 _mesa_override_extensions(struct gl_context
*ctx
)
83 const GLboolean
*enables
=
84 (GLboolean
*) &_mesa_extension_override_enables
;
85 const GLboolean
*disables
=
86 (GLboolean
*) &_mesa_extension_override_disables
;
87 GLboolean
*ctx_ext
= (GLboolean
*)&ctx
->Extensions
;
89 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
90 size_t offset
= _mesa_extension_table
[i
].offset
;
92 assert(!enables
[offset
] || !disables
[offset
]);
93 if (enables
[offset
]) {
95 } else if (disables
[offset
]) {
103 * Enable all extensions suitable for a software-only renderer.
104 * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
107 _mesa_enable_sw_extensions(struct gl_context
*ctx
)
109 ctx
->Extensions
.ARB_depth_clamp
= GL_TRUE
;
110 ctx
->Extensions
.ARB_depth_texture
= GL_TRUE
;
111 ctx
->Extensions
.ARB_draw_elements_base_vertex
= GL_TRUE
;
112 ctx
->Extensions
.ARB_draw_instanced
= GL_TRUE
;
113 ctx
->Extensions
.ARB_explicit_attrib_location
= GL_TRUE
;
114 ctx
->Extensions
.ARB_fragment_coord_conventions
= GL_TRUE
;
115 ctx
->Extensions
.ARB_fragment_program
= GL_TRUE
;
116 ctx
->Extensions
.ARB_fragment_program_shadow
= GL_TRUE
;
117 ctx
->Extensions
.ARB_fragment_shader
= GL_TRUE
;
118 ctx
->Extensions
.ARB_framebuffer_object
= GL_TRUE
;
119 ctx
->Extensions
.ARB_half_float_vertex
= GL_TRUE
;
120 ctx
->Extensions
.ARB_map_buffer_range
= GL_TRUE
;
121 ctx
->Extensions
.ARB_occlusion_query
= GL_TRUE
;
122 ctx
->Extensions
.ARB_occlusion_query2
= GL_TRUE
;
123 ctx
->Extensions
.ARB_point_sprite
= GL_TRUE
;
124 ctx
->Extensions
.ARB_shadow
= GL_TRUE
;
125 ctx
->Extensions
.ARB_texture_border_clamp
= GL_TRUE
;
126 ctx
->Extensions
.ARB_texture_compression_bptc
= GL_TRUE
;
127 ctx
->Extensions
.ARB_texture_cube_map
= GL_TRUE
;
128 ctx
->Extensions
.ARB_texture_env_combine
= GL_TRUE
;
129 ctx
->Extensions
.ARB_texture_env_crossbar
= GL_TRUE
;
130 ctx
->Extensions
.ARB_texture_env_dot3
= GL_TRUE
;
131 ctx
->Extensions
.ARB_texture_filter_anisotropic
= GL_TRUE
;
132 #ifdef TEXTURE_FLOAT_ENABLED
133 ctx
->Extensions
.ARB_texture_float
= GL_TRUE
;
135 ctx
->Extensions
.ARB_texture_mirror_clamp_to_edge
= GL_TRUE
;
136 ctx
->Extensions
.ARB_texture_non_power_of_two
= GL_TRUE
;
137 ctx
->Extensions
.ARB_texture_rg
= GL_TRUE
;
138 ctx
->Extensions
.ARB_texture_compression_rgtc
= GL_TRUE
;
139 ctx
->Extensions
.ARB_vertex_program
= GL_TRUE
;
140 ctx
->Extensions
.ARB_vertex_shader
= GL_TRUE
;
141 ctx
->Extensions
.ARB_sync
= GL_TRUE
;
142 ctx
->Extensions
.APPLE_object_purgeable
= GL_TRUE
;
143 ctx
->Extensions
.ATI_fragment_shader
= GL_TRUE
;
144 ctx
->Extensions
.ATI_texture_compression_3dc
= GL_TRUE
;
145 ctx
->Extensions
.ATI_texture_env_combine3
= GL_TRUE
;
146 ctx
->Extensions
.ATI_texture_mirror_once
= GL_TRUE
;
147 ctx
->Extensions
.ATI_separate_stencil
= GL_TRUE
;
148 ctx
->Extensions
.EXT_blend_color
= GL_TRUE
;
149 ctx
->Extensions
.EXT_blend_equation_separate
= GL_TRUE
;
150 ctx
->Extensions
.EXT_blend_func_separate
= GL_TRUE
;
151 ctx
->Extensions
.EXT_blend_minmax
= GL_TRUE
;
152 ctx
->Extensions
.EXT_depth_bounds_test
= GL_TRUE
;
153 ctx
->Extensions
.EXT_draw_buffers2
= GL_TRUE
;
154 ctx
->Extensions
.EXT_pixel_buffer_object
= GL_TRUE
;
155 ctx
->Extensions
.EXT_point_parameters
= GL_TRUE
;
156 ctx
->Extensions
.EXT_provoking_vertex
= GL_TRUE
;
157 ctx
->Extensions
.EXT_stencil_two_side
= GL_TRUE
;
158 ctx
->Extensions
.EXT_texture_array
= GL_TRUE
;
159 ctx
->Extensions
.EXT_texture_compression_latc
= GL_TRUE
;
160 ctx
->Extensions
.EXT_texture_env_dot3
= GL_TRUE
;
161 ctx
->Extensions
.EXT_texture_filter_anisotropic
= GL_TRUE
;
162 ctx
->Extensions
.EXT_texture_mirror_clamp
= GL_TRUE
;
163 ctx
->Extensions
.EXT_texture_shared_exponent
= GL_TRUE
;
164 ctx
->Extensions
.EXT_texture_sRGB
= GL_TRUE
;
165 ctx
->Extensions
.EXT_texture_sRGB_decode
= GL_TRUE
;
166 ctx
->Extensions
.EXT_texture_swizzle
= GL_TRUE
;
167 /*ctx->Extensions.EXT_transform_feedback = GL_TRUE;*/
168 ctx
->Extensions
.EXT_vertex_array_bgra
= GL_TRUE
;
169 ctx
->Extensions
.MESA_pack_invert
= GL_TRUE
;
170 ctx
->Extensions
.MESA_ycbcr_texture
= GL_TRUE
;
171 ctx
->Extensions
.NV_conditional_render
= GL_TRUE
;
172 ctx
->Extensions
.NV_point_sprite
= GL_TRUE
;
173 ctx
->Extensions
.NV_texture_env_combine4
= GL_TRUE
;
174 ctx
->Extensions
.NV_texture_rectangle
= GL_TRUE
;
175 ctx
->Extensions
.EXT_gpu_program_parameters
= GL_TRUE
;
176 ctx
->Extensions
.OES_standard_derivatives
= GL_TRUE
;
177 ctx
->Extensions
.TDFX_texture_compression_FXT1
= GL_TRUE
;
178 ctx
->Extensions
.ANGLE_texture_compression_dxt
= GL_TRUE
;
179 ctx
->Extensions
.EXT_texture_compression_s3tc
= GL_TRUE
;
183 * Either enable or disable the named extension.
184 * \return offset of extensions withint `ext' or 0 if extension is not known
187 set_extension(struct gl_extensions
*ext
, int i
, GLboolean state
)
191 offset
= i
< 0 ? 0 : _mesa_extension_table
[i
].offset
;
192 if (offset
!= 0 && (offset
!= o(dummy_true
) || state
!= GL_FALSE
)) {
193 ((GLboolean
*) ext
)[offset
] = state
;
201 * \brief Free string pointed by unrecognized_extensions
203 * This string is allocated early during the first context creation by
204 * _mesa_one_time_init_extension_overrides.
207 free_unknown_extensions_strings(void)
209 free(unrecognized_extensions
);
214 * \brief Initialize extension override tables based on \c MESA_EXTENSION_OVERRIDE
216 * This should be called one time early during first context initialization.
218 * \c MESA_EXTENSION_OVERRIDE is a space-separated list of extensions to
219 * enable or disable. The list is processed thus:
220 * - Enable recognized extension names that are prefixed with '+'.
221 * - Disable recognized extension names that are prefixed with '-'.
222 * - Enable recognized extension names that are not prefixed.
223 * - Collect unrecognized extension names in a new string.
226 _mesa_one_time_init_extension_overrides(struct gl_context
*ctx
)
228 const char *env_const
= getenv("MESA_EXTENSION_OVERRIDE");
232 unsigned unknown_ext
= 0;
234 memset(&_mesa_extension_override_enables
, 0, sizeof(struct gl_extensions
));
235 memset(&_mesa_extension_override_disables
, 0, sizeof(struct gl_extensions
));
237 if (env_const
== NULL
) {
241 /* Copy env_const because strtok() is destructive. */
242 env
= strdup(env_const
);
247 for (ext
= strtok(env
, " "); ext
!= NULL
; ext
= strtok(NULL
, " ")) {
265 i
= name_to_index(ext
);
266 offset
= set_extension(&_mesa_extension_override_enables
, i
, enable
);
267 offset
= set_extension(&_mesa_extension_override_disables
, i
, !enable
);
273 if (!recognized
&& enable
) {
274 if (unknown_ext
>= MAX_UNRECOGNIZED_EXTENSIONS
) {
279 _mesa_problem(ctx
, "Trying to enable too many unknown extension. "
280 "Only the first %d will be honoured",
281 MAX_UNRECOGNIZED_EXTENSIONS
);
284 ctx
->Extensions
.unrecognized_extensions
[unknown_ext
] = ext
;
287 _mesa_problem(ctx
, "Trying to enable unknown extension: %s", ext
);
295 unrecognized_extensions
= env
;
296 atexit(free_unknown_extensions_strings
);
302 * \brief Initialize extension tables and enable default extensions.
304 * This should be called during context initialization.
305 * Note: Sets gl_extensions.dummy_true to true.
308 _mesa_init_extensions(struct gl_extensions
*extensions
)
310 GLboolean
*base
= (GLboolean
*) extensions
;
311 GLboolean
*sentinel
= base
+ o(extension_sentinel
);
314 /* First, turn all extensions off. */
315 for (i
= base
; i
!= sentinel
; ++i
)
318 /* Then, selectively turn default extensions on. */
319 extensions
->dummy_true
= GL_TRUE
;
323 typedef unsigned short extension_index
;
327 * Given an extension enum, return whether or not the extension is supported
328 * dependent on the following factors:
329 * There's driver support and the OpenGL/ES version is at least that
330 * specified in the _mesa_extension_table.
333 _mesa_extension_supported(const struct gl_context
*ctx
, extension_index i
)
335 const bool *base
= (bool *) &ctx
->Extensions
;
336 const struct mesa_extension
*ext
= _mesa_extension_table
+ i
;
338 return (ctx
->Version
>= ext
->version
[ctx
->API
]) && base
[ext
->offset
];
343 * Construct the GL_EXTENSIONS string. Called the first time that
344 * glGetString(GL_EXTENSIONS) is called.
347 _mesa_make_extension_string(struct gl_context
*ctx
)
349 /* The extension string. */
351 /* Length of extension string. */
353 /* Number of extensions */
355 /* Indices of the extensions sorted by year */
356 extension_index extension_indices
[MESA_EXTENSION_COUNT
];
359 unsigned maxYear
= ~0;
361 /* Check if the MESA_EXTENSION_MAX_YEAR env var is set */
363 const char *env
= getenv("MESA_EXTENSION_MAX_YEAR");
366 _mesa_debug(ctx
, "Note: limiting GL extensions to %u or earlier\n",
371 /* Compute length of the extension string. */
373 for (k
= 0; k
< MESA_EXTENSION_COUNT
; ++k
) {
374 const struct mesa_extension
*i
= _mesa_extension_table
+ k
;
376 if (i
->year
<= maxYear
&&
377 _mesa_extension_supported(ctx
, k
)) {
378 length
+= strlen(i
->name
) + 1; /* +1 for space */
379 extension_indices
[count
++] = k
;
382 for (k
= 0; k
< MAX_UNRECOGNIZED_EXTENSIONS
; k
++)
383 if (ctx
->Extensions
.unrecognized_extensions
[k
])
384 length
+= 1 + strlen(ctx
->Extensions
.unrecognized_extensions
[k
]); /* +1 for space */
386 exts
= calloc(ALIGN(length
+ 1, 4), sizeof(char));
391 /* Build the extension string.*/
392 for (j
= 0; j
< count
; ++j
) {
393 const struct mesa_extension
*i
= &_mesa_extension_table
[extension_indices
[j
]];
394 assert(_mesa_extension_supported(ctx
, extension_indices
[j
]));
395 strcat(exts
, i
->name
);
398 for (j
= 0; j
< MAX_UNRECOGNIZED_EXTENSIONS
; j
++) {
399 if (ctx
->Extensions
.unrecognized_extensions
[j
]) {
400 strcat(exts
, ctx
->Extensions
.unrecognized_extensions
[j
]);
405 return (GLubyte
*) exts
;
409 * Return number of enabled extensions.
412 _mesa_get_extension_count(struct gl_context
*ctx
)
416 /* only count once */
417 if (ctx
->Extensions
.Count
!= 0)
418 return ctx
->Extensions
.Count
;
420 for (k
= 0; k
< MESA_EXTENSION_COUNT
; ++k
) {
421 if (_mesa_extension_supported(ctx
, k
))
422 ctx
->Extensions
.Count
++;
424 return ctx
->Extensions
.Count
;
428 * Return name of i-th enabled extension
431 _mesa_get_enabled_extension(struct gl_context
*ctx
, GLuint index
)
436 for (i
= 0; i
< MESA_EXTENSION_COUNT
; ++i
) {
437 if (_mesa_extension_supported(ctx
, i
)) {
439 return (const GLubyte
*) _mesa_extension_table
[i
].name
;