2 * Mesa 3-D graphics library
4 * Copyright (C) 2010 VMware, Inc. All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
32 * Scans 'string' to see if it ends with 'ending'.
35 check_for_ending(const char *string
, const char *ending
)
39 len1
= strlen(string
);
40 len2
= strlen(ending
);
46 if (strcmp(string
+ (len1
- len2
), ending
) == 0) {
54 * Returns the gl override data
56 * version > 0 indicates there is an override requested
57 * fwd_context is only valid if version > 0
60 get_gl_override(int *version
, GLboolean
*fwd_context
)
62 const char *env_var
= "MESA_GL_VERSION_OVERRIDE";
63 const char *version_str
;
65 static int override_version
= -1;
66 static GLboolean fc_suffix
= GL_FALSE
;
68 if (override_version
< 0) {
71 version_str
= getenv(env_var
);
73 fc_suffix
= check_for_ending(version_str
, "FC");
75 n
= sscanf(version_str
, "%u.%u", &major
, &minor
);
77 fprintf(stderr
, "error: invalid value for %s: %s\n", env_var
, version_str
);
80 override_version
= major
* 10 + minor
;
81 if (override_version
< 30 && fc_suffix
) {
82 fprintf(stderr
, "error: invalid value for %s: %s\n", env_var
, version_str
);
88 *version
= override_version
;
89 *fwd_context
= fc_suffix
;
93 * Builds the MESA version string.
96 create_version_string(struct gl_context
*ctx
, const char *prefix
)
98 static const int max
= 100;
100 ctx
->VersionString
= malloc(max
);
101 if (ctx
->VersionString
) {
102 _mesa_snprintf(ctx
->VersionString
, max
,
103 "%s%u.%u%s Mesa " PACKAGE_VERSION
105 " (" MESA_GIT_SHA1
")"
109 ctx
->Version
/ 10, ctx
->Version
% 10,
110 (ctx
->API
== API_OPENGL_CORE
) ? " (Core Profile)" : ""
116 * Override the context's version and/or API type if the
117 * environment variable MESA_GL_VERSION_OVERRIDE is set.
119 * Example uses of MESA_GL_VERSION_OVERRIDE:
121 * 2.1: select a compatibility (non-Core) profile with GL version 2.1
122 * 3.0: select a compatibility (non-Core) profile with GL version 3.0
123 * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
124 * 3.1: select a Core profile with GL version 3.1
125 * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
128 _mesa_override_gl_version(struct gl_context
*ctx
)
131 GLboolean fwd_context
;
133 get_gl_override(&version
, &fwd_context
);
136 ctx
->Version
= version
;
137 if (version
>= 30 && fwd_context
) {
138 ctx
->API
= API_OPENGL_CORE
;
139 ctx
->Const
.ContextFlags
|= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
;
140 } else if (version
>= 31) {
141 ctx
->API
= API_OPENGL_CORE
;
143 ctx
->API
= API_OPENGL_COMPAT
;
145 create_version_string(ctx
, "");
150 * Returns the gl override value
152 * version > 0 indicates there is an override requested
155 _mesa_get_gl_version_override(void)
158 GLboolean fwd_context
;
160 get_gl_override(&version
, &fwd_context
);
166 * Override the context's GLSL version if the environment variable
167 * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
168 * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
171 _mesa_override_glsl_version(struct gl_context
*ctx
)
173 const char *env_var
= "MESA_GLSL_VERSION_OVERRIDE";
177 version
= getenv(env_var
);
182 n
= sscanf(version
, "%u", &ctx
->Const
.GLSLVersion
);
184 fprintf(stderr
, "error: invalid value for %s: %s\n", env_var
, version
);
190 * Examine enabled GL extensions to determine GL version.
193 compute_version(struct gl_context
*ctx
)
197 const GLboolean ver_1_3
= (ctx
->Extensions
.ARB_texture_border_clamp
&&
198 ctx
->Extensions
.ARB_texture_cube_map
&&
199 ctx
->Extensions
.ARB_texture_env_combine
&&
200 ctx
->Extensions
.ARB_texture_env_dot3
);
201 const GLboolean ver_1_4
= (ver_1_3
&&
202 ctx
->Extensions
.ARB_depth_texture
&&
203 ctx
->Extensions
.ARB_shadow
&&
204 ctx
->Extensions
.ARB_texture_env_crossbar
&&
205 ctx
->Extensions
.EXT_blend_color
&&
206 ctx
->Extensions
.EXT_blend_func_separate
&&
207 ctx
->Extensions
.EXT_blend_minmax
&&
208 ctx
->Extensions
.EXT_point_parameters
);
209 const GLboolean ver_1_5
= (ver_1_4
&&
210 ctx
->Extensions
.ARB_occlusion_query
);
211 const GLboolean ver_2_0
= (ver_1_5
&&
212 ctx
->Extensions
.ARB_point_sprite
&&
213 ctx
->Extensions
.ARB_vertex_shader
&&
214 ctx
->Extensions
.ARB_fragment_shader
&&
215 ctx
->Extensions
.ARB_texture_non_power_of_two
&&
216 ctx
->Extensions
.EXT_blend_equation_separate
&&
218 /* Technically, 2.0 requires the functionality
219 * of the EXT version. Enable 2.0 if either
220 * extension is available, and assume that a
221 * driver that only exposes the ATI extension
222 * will fallback to software when necessary.
224 (ctx
->Extensions
.EXT_stencil_two_side
225 || ctx
->Extensions
.ATI_separate_stencil
));
226 const GLboolean ver_2_1
= (ver_2_0
&&
227 ctx
->Extensions
.EXT_pixel_buffer_object
&&
228 ctx
->Extensions
.EXT_texture_sRGB
);
229 const GLboolean ver_3_0
= (ver_2_1
&&
230 ctx
->Const
.GLSLVersion
>= 130 &&
231 ctx
->Const
.MaxSamples
>= 4 &&
232 (ctx
->API
== API_OPENGL_CORE
||
233 ctx
->Extensions
.ARB_color_buffer_float
) &&
234 ctx
->Extensions
.ARB_depth_buffer_float
&&
235 ctx
->Extensions
.ARB_half_float_pixel
&&
236 ctx
->Extensions
.ARB_half_float_vertex
&&
237 ctx
->Extensions
.ARB_map_buffer_range
&&
238 ctx
->Extensions
.ARB_shader_texture_lod
&&
239 ctx
->Extensions
.ARB_texture_float
&&
240 ctx
->Extensions
.ARB_texture_rg
&&
241 ctx
->Extensions
.ARB_texture_compression_rgtc
&&
242 ctx
->Extensions
.EXT_draw_buffers2
&&
243 ctx
->Extensions
.ARB_framebuffer_object
&&
244 ctx
->Extensions
.EXT_framebuffer_sRGB
&&
245 ctx
->Extensions
.EXT_packed_float
&&
246 ctx
->Extensions
.EXT_texture_array
&&
247 ctx
->Extensions
.EXT_texture_shared_exponent
&&
248 ctx
->Extensions
.EXT_transform_feedback
&&
249 ctx
->Extensions
.NV_conditional_render
);
250 const GLboolean ver_3_1
= (ver_3_0
&&
251 ctx
->Const
.GLSLVersion
>= 140 &&
252 ctx
->Extensions
.ARB_draw_instanced
&&
253 ctx
->Extensions
.ARB_texture_buffer_object
&&
254 ctx
->Extensions
.ARB_uniform_buffer_object
&&
255 ctx
->Extensions
.EXT_texture_snorm
&&
256 ctx
->Extensions
.NV_primitive_restart
&&
257 ctx
->Extensions
.NV_texture_rectangle
&&
258 ctx
->Const
.VertexProgram
.MaxTextureImageUnits
>= 16);
259 const GLboolean ver_3_2
= (ver_3_1
&&
260 ctx
->Const
.GLSLVersion
>= 150 &&
261 ctx
->Extensions
.ARB_depth_clamp
&&
262 ctx
->Extensions
.ARB_draw_elements_base_vertex
&&
263 ctx
->Extensions
.ARB_fragment_coord_conventions
&&
264 ctx
->Extensions
.EXT_provoking_vertex
&&
265 ctx
->Extensions
.ARB_seamless_cube_map
&&
266 ctx
->Extensions
.ARB_sync
&&
267 ctx
->Extensions
.ARB_texture_multisample
&&
268 ctx
->Extensions
.EXT_vertex_array_bgra
);
269 const GLboolean ver_3_3
= (ver_3_2
&&
270 ctx
->Const
.GLSLVersion
>= 330 &&
271 ctx
->Extensions
.ARB_blend_func_extended
&&
272 ctx
->Extensions
.ARB_explicit_attrib_location
&&
273 ctx
->Extensions
.ARB_instanced_arrays
&&
274 ctx
->Extensions
.ARB_occlusion_query2
&&
275 ctx
->Extensions
.ARB_shader_bit_encoding
&&
276 ctx
->Extensions
.ARB_texture_rgb10_a2ui
&&
277 ctx
->Extensions
.ARB_timer_query
&&
278 ctx
->Extensions
.ARB_vertex_type_2_10_10_10_rev
&&
279 ctx
->Extensions
.EXT_texture_swizzle
);
280 /* ARB_sampler_objects is always enabled in mesa */
323 ctx
->Version
= major
* 10 + minor
;
325 create_version_string(ctx
, "");
329 compute_version_es1(struct gl_context
*ctx
)
331 /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
332 const GLboolean ver_1_0
= (ctx
->Extensions
.ARB_texture_env_combine
&&
333 ctx
->Extensions
.ARB_texture_env_dot3
);
334 /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
335 const GLboolean ver_1_1
= (ver_1_0
&&
336 ctx
->Extensions
.EXT_point_parameters
);
340 } else if (ver_1_0
) {
343 _mesa_problem(ctx
, "Incomplete OpenGL ES 1.0 support.");
346 create_version_string(ctx
, "OpenGL ES-CM ");
350 compute_version_es2(struct gl_context
*ctx
)
352 /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
353 const GLboolean ver_2_0
= (ctx
->Extensions
.ARB_texture_cube_map
&&
354 ctx
->Extensions
.EXT_blend_color
&&
355 ctx
->Extensions
.EXT_blend_func_separate
&&
356 ctx
->Extensions
.EXT_blend_minmax
&&
357 ctx
->Extensions
.ARB_vertex_shader
&&
358 ctx
->Extensions
.ARB_fragment_shader
&&
359 ctx
->Extensions
.ARB_texture_non_power_of_two
&&
360 ctx
->Extensions
.EXT_blend_equation_separate
);
361 /* FINISHME: This list isn't quite right. */
362 const GLboolean ver_3_0
= (ctx
->Extensions
.ARB_half_float_vertex
&&
363 ctx
->Extensions
.ARB_internalformat_query
&&
364 ctx
->Extensions
.ARB_map_buffer_range
&&
365 ctx
->Extensions
.ARB_shader_texture_lod
&&
366 ctx
->Extensions
.ARB_texture_float
&&
367 ctx
->Extensions
.ARB_texture_rg
&&
368 ctx
->Extensions
.ARB_texture_compression_rgtc
&&
369 ctx
->Extensions
.EXT_draw_buffers2
&&
370 /* ctx->Extensions.ARB_framebuffer_object && */
371 ctx
->Extensions
.EXT_framebuffer_sRGB
&&
372 ctx
->Extensions
.EXT_packed_float
&&
373 ctx
->Extensions
.EXT_texture_array
&&
374 ctx
->Extensions
.EXT_texture_shared_exponent
&&
375 ctx
->Extensions
.EXT_transform_feedback
&&
376 ctx
->Extensions
.NV_conditional_render
&&
377 ctx
->Extensions
.ARB_draw_instanced
&&
378 ctx
->Extensions
.ARB_uniform_buffer_object
&&
379 ctx
->Extensions
.EXT_texture_snorm
&&
380 ctx
->Extensions
.NV_primitive_restart
&&
381 ctx
->Extensions
.OES_depth_texture_cube_map
);
384 } else if (ver_2_0
) {
387 _mesa_problem(ctx
, "Incomplete OpenGL ES 2.0 support.");
390 create_version_string(ctx
, "OpenGL ES ");
394 * Set the context's Version and VersionString fields.
395 * This should only be called once as part of context initialization
396 * or to perform version check for GLX_ARB_create_context_profile.
399 _mesa_compute_version(struct gl_context
*ctx
)
405 case API_OPENGL_COMPAT
:
406 /* Disable GLSL 1.40 and later for legacy contexts.
407 * This disallows creation of the GL 3.1 compatibility context. */
408 if (ctx
->Const
.GLSLVersion
> 130) {
409 ctx
->Const
.GLSLVersion
= 130;
412 case API_OPENGL_CORE
:
413 compute_version(ctx
);
416 compute_version_es1(ctx
);
419 compute_version_es2(ctx
);