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1 /*
2  * Mesa 3-D graphics library
3  *
4  * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
5  *
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:
12  *
13  * The above copyright notice and this permission notice shall be included
14  * in all copies or substantial portions of the Software.
15  *
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.
23  */
24 
25 
26 #include <stdio.h>
27 #include "context.h"
28 
29 #include "mtypes.h"
30 #include "version.h"
31 #include "git_sha1.h"
32 
33 /**
34  * Scans 'string' to see if it ends with 'ending'.
35  */
36 static bool
check_for_ending(const char * string,const char * ending)37 check_for_ending(const char *string, const char *ending)
38 {
39    const size_t len1 = strlen(string);
40    const size_t len2 = strlen(ending);
41 
42    if (len2 > len1)
43       return false;
44 
45    return strcmp(string + (len1 - len2), ending) == 0;
46 }
47 
48 /**
49  * Returns the gl override data
50  *
51  * version > 0 indicates there is an override requested
52  * fwd_context is only valid if version > 0
53  */
54 static void
get_gl_override(gl_api api,int * version,bool * fwd_context,bool * compat_context)55 get_gl_override(gl_api api, int *version, bool *fwd_context,
56                 bool *compat_context)
57 {
58    const char *env_var = (api == API_OPENGL_CORE || api == API_OPENGL_COMPAT)
59       ? "MESA_GL_VERSION_OVERRIDE" : "MESA_GLES_VERSION_OVERRIDE";
60    const char *version_str;
61    int major, minor, n;
62    static struct override_info {
63       int version;
64       bool fc_suffix;
65       bool compat_suffix;
66    } override[] = {
67       [API_OPENGL_COMPAT] = { -1, false, false},
68       [API_OPENGLES]      = { -1, false, false},
69       [API_OPENGLES2]     = { -1, false, false},
70       [API_OPENGL_CORE]   = { -1, false, false},
71    };
72 
73    STATIC_ASSERT(ARRAY_SIZE(override) == API_OPENGL_LAST + 1);
74 
75    if (api == API_OPENGLES)
76       goto exit;
77 
78    if (override[api].version < 0) {
79       override[api].version = 0;
80 
81       version_str = getenv(env_var);
82       if (version_str) {
83          override[api].fc_suffix = check_for_ending(version_str, "FC");
84          override[api].compat_suffix = check_for_ending(version_str, "COMPAT");
85 
86          n = sscanf(version_str, "%u.%u", &major, &minor);
87          if (n != 2) {
88             fprintf(stderr, "error: invalid value for %s: %s\n",
89                     env_var, version_str);
90             override[api].version = 0;
91          } else {
92             override[api].version = major * 10 + minor;
93 
94             /* There is no such thing as compatibility or forward-compatible for
95              * OpenGL ES 2.0 or 3.x APIs.
96              */
97             if ((override[api].version < 30 && override[api].fc_suffix) ||
98                 (api == API_OPENGLES2 && (override[api].fc_suffix ||
99                                           override[api].compat_suffix))) {
100                fprintf(stderr, "error: invalid value for %s: %s\n",
101                        env_var, version_str);
102             }
103          }
104       }
105    }
106 
107 exit:
108    *version = override[api].version;
109    *fwd_context = override[api].fc_suffix;
110    *compat_context = override[api].compat_suffix;
111 }
112 
113 /**
114  * Builds the Mesa version string.
115  */
116 static void
create_version_string(struct gl_context * ctx,const char * prefix)117 create_version_string(struct gl_context *ctx, const char *prefix)
118 {
119    static const int max = 100;
120 
121    ctx->VersionString = malloc(max);
122    if (ctx->VersionString) {
123       snprintf(ctx->VersionString, max,
124 		     "%s%u.%u%s Mesa " PACKAGE_VERSION MESA_GIT_SHA1,
125 		     prefix,
126 		     ctx->Version / 10, ctx->Version % 10,
127 		     (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" :
128                      (ctx->API == API_OPENGL_COMPAT && ctx->Version >= 32) ?
129                         " (Compatibility Profile)" : ""
130 		     );
131    }
132 }
133 
134 /**
135  * Override the context's version and/or API type if the environment variables
136  * MESA_GL_VERSION_OVERRIDE or MESA_GLES_VERSION_OVERRIDE are set.
137  *
138  * Example uses of MESA_GL_VERSION_OVERRIDE:
139  *
140  * 2.1: select a compatibility (non-Core) profile with GL version 2.1.
141  * 3.0: select a compatibility (non-Core) profile with GL version 3.0.
142  * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0.
143  * 3.1: select GL version 3.1 with GL_ARB_compatibility enabled per the driver default.
144  * 3.1FC: select GL version 3.1 with forward compatibility and GL_ARB_compatibility disabled.
145  * 3.1COMPAT: select GL version 3.1 with GL_ARB_compatibility enabled.
146  * X.Y: override GL version to X.Y without changing the profile.
147  * X.YFC: select a Core+Forward Compatible profile with GL version X.Y.
148  * X.YCOMPAT: select a Compatibility profile with GL version X.Y.
149  *
150  * Example uses of MESA_GLES_VERSION_OVERRIDE:
151  *
152  * 2.0: select GLES version 2.0.
153  * 3.0: select GLES version 3.0.
154  * 3.1: select GLES version 3.1.
155  */
156 bool
_mesa_override_gl_version_contextless(struct gl_constants * consts,gl_api * apiOut,GLuint * versionOut)157 _mesa_override_gl_version_contextless(struct gl_constants *consts,
158                                       gl_api *apiOut, GLuint *versionOut)
159 {
160    int version;
161    bool fwd_context, compat_context;
162 
163    get_gl_override(*apiOut, &version, &fwd_context, &compat_context);
164 
165    if (version > 0) {
166       *versionOut = version;
167 
168       /* Modify the API and context flags as needed. */
169       if (*apiOut == API_OPENGL_CORE || *apiOut == API_OPENGL_COMPAT) {
170          if (version >= 30 && fwd_context) {
171             *apiOut = API_OPENGL_CORE;
172             consts->ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
173          } else if (compat_context) {
174             *apiOut = API_OPENGL_COMPAT;
175          }
176       }
177 
178       return true;
179    }
180    return false;
181 }
182 
183 void
_mesa_override_gl_version(struct gl_context * ctx)184 _mesa_override_gl_version(struct gl_context *ctx)
185 {
186    if (_mesa_override_gl_version_contextless(&ctx->Const, &ctx->API,
187                                              &ctx->Version)) {
188       /* We need to include API in version string for OpenGL ES, otherwise
189        * application can not detect GLES via glGetString(GL_VERSION) query.
190        *
191        * From OpenGL ES 3.2 spec, Page 436:
192        *
193        *     "The VERSION string is laid out as follows:
194        *
195        *     OpenGL ES N.M vendor-specific information"
196        *
197        * From OpenGL 4.5 spec, Page 538:
198        *
199        *     "The VERSION and SHADING_LANGUAGE_VERSION strings are laid out as
200        *     follows:
201        *
202        *     <version number><space><vendor-specific information>"
203        */
204       create_version_string(ctx, _mesa_is_gles(ctx) ? "OpenGL ES " : "");
205       ctx->Extensions.Version = ctx->Version;
206    }
207 }
208 
209 /**
210  * Override the context's GLSL version if the environment variable
211  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
212  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
213  */
214 void
_mesa_override_glsl_version(struct gl_constants * consts)215 _mesa_override_glsl_version(struct gl_constants *consts)
216 {
217    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
218    const char *version;
219    int n;
220 
221    version = getenv(env_var);
222    if (!version) {
223       return;
224    }
225 
226    n = sscanf(version, "%u", &consts->GLSLVersion);
227    if (n != 1) {
228       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
229       return;
230    }
231 }
232 
233 /**
234  * Examine enabled GL extensions to determine GL version.
235  */
236 static GLuint
compute_version(const struct gl_extensions * extensions,const struct gl_constants * consts,gl_api api)237 compute_version(const struct gl_extensions *extensions,
238                 const struct gl_constants *consts, gl_api api)
239 {
240    GLuint major, minor, version;
241 
242    const bool ver_1_3 = (extensions->ARB_texture_border_clamp &&
243                          extensions->ARB_texture_cube_map &&
244                          extensions->ARB_texture_env_combine &&
245                          extensions->ARB_texture_env_dot3);
246    const bool ver_1_4 = (ver_1_3 &&
247                          extensions->ARB_depth_texture &&
248                          extensions->ARB_shadow &&
249                          extensions->ARB_texture_env_crossbar &&
250                          extensions->EXT_blend_color &&
251                          extensions->EXT_blend_func_separate &&
252                          extensions->EXT_blend_minmax &&
253                          extensions->EXT_point_parameters);
254    const bool ver_1_5 = (ver_1_4 &&
255                          extensions->ARB_occlusion_query);
256    const bool ver_2_0 = (ver_1_5 &&
257                          extensions->ARB_point_sprite &&
258                          extensions->ARB_vertex_shader &&
259                          extensions->ARB_fragment_shader &&
260                          extensions->ARB_texture_non_power_of_two &&
261                          extensions->EXT_blend_equation_separate &&
262                          extensions->EXT_stencil_two_side);
263    const bool ver_2_1 = (ver_2_0 &&
264                          extensions->EXT_pixel_buffer_object &&
265                          extensions->EXT_texture_sRGB);
266    const bool ver_3_0 = (ver_2_1 &&
267                          consts->GLSLVersion >= 130 &&
268                          (consts->MaxSamples >= 4 || consts->FakeSWMSAA) &&
269                          (api == API_OPENGL_CORE ||
270                           extensions->ARB_color_buffer_float) &&
271                          extensions->ARB_depth_buffer_float &&
272                          extensions->ARB_half_float_vertex &&
273                          extensions->ARB_map_buffer_range &&
274                          extensions->ARB_shader_texture_lod &&
275                          extensions->ARB_texture_float &&
276                          extensions->ARB_texture_rg &&
277                          extensions->ARB_texture_compression_rgtc &&
278                          extensions->EXT_draw_buffers2 &&
279                          extensions->ARB_framebuffer_object &&
280                          extensions->EXT_framebuffer_sRGB &&
281                          extensions->EXT_packed_float &&
282                          extensions->EXT_texture_array &&
283                          extensions->EXT_texture_shared_exponent &&
284                          extensions->EXT_transform_feedback &&
285                          extensions->NV_conditional_render);
286    const bool ver_3_1 = (ver_3_0 &&
287                          consts->GLSLVersion >= 140 &&
288                          extensions->ARB_draw_instanced &&
289                          extensions->ARB_texture_buffer_object &&
290                          extensions->ARB_uniform_buffer_object &&
291                          extensions->EXT_texture_snorm &&
292                          extensions->NV_primitive_restart &&
293                          extensions->NV_texture_rectangle &&
294                          consts->Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
295    const bool ver_3_2 = (ver_3_1 &&
296                          consts->GLSLVersion >= 150 &&
297                          extensions->ARB_depth_clamp &&
298                          extensions->ARB_draw_elements_base_vertex &&
299                          extensions->ARB_fragment_coord_conventions &&
300                          extensions->EXT_provoking_vertex &&
301                          extensions->ARB_seamless_cube_map &&
302                          extensions->ARB_sync &&
303                          extensions->ARB_texture_multisample &&
304                          extensions->EXT_vertex_array_bgra);
305    const bool ver_3_3 = (ver_3_2 &&
306                          consts->GLSLVersion >= 330 &&
307                          extensions->ARB_blend_func_extended &&
308                          extensions->ARB_explicit_attrib_location &&
309                          extensions->ARB_instanced_arrays &&
310                          extensions->ARB_occlusion_query2 &&
311                          extensions->ARB_shader_bit_encoding &&
312                          extensions->ARB_texture_rgb10_a2ui &&
313                          extensions->ARB_timer_query &&
314                          extensions->ARB_vertex_type_2_10_10_10_rev &&
315                          extensions->EXT_texture_swizzle);
316    /* ARB_sampler_objects is always enabled in mesa */
317 
318    const bool ver_4_0 = (ver_3_3 &&
319                          consts->GLSLVersion >= 400 &&
320                          extensions->ARB_draw_buffers_blend &&
321                          extensions->ARB_draw_indirect &&
322                          extensions->ARB_gpu_shader5 &&
323                          extensions->ARB_gpu_shader_fp64 &&
324                          extensions->ARB_sample_shading &&
325                          extensions->ARB_tessellation_shader &&
326                          extensions->ARB_texture_buffer_object_rgb32 &&
327                          extensions->ARB_texture_cube_map_array &&
328                          extensions->ARB_texture_query_lod &&
329                          extensions->ARB_transform_feedback2 &&
330                          extensions->ARB_transform_feedback3);
331    const bool ver_4_1 = (ver_4_0 &&
332                          consts->GLSLVersion >= 410 &&
333                          consts->MaxTextureSize >= 16384 &&
334                          consts->MaxRenderbufferSize >= 16384 &&
335                          extensions->ARB_ES2_compatibility &&
336                          extensions->ARB_shader_precision &&
337                          extensions->ARB_vertex_attrib_64bit &&
338                          extensions->ARB_viewport_array);
339    const bool ver_4_2 = (ver_4_1 &&
340                          consts->GLSLVersion >= 420 &&
341                          extensions->ARB_base_instance &&
342                          extensions->ARB_conservative_depth &&
343                          extensions->ARB_internalformat_query &&
344                          extensions->ARB_shader_atomic_counters &&
345                          extensions->ARB_shader_image_load_store &&
346                          extensions->ARB_shading_language_420pack &&
347                          extensions->ARB_shading_language_packing &&
348                          extensions->ARB_texture_compression_bptc &&
349                          extensions->ARB_transform_feedback_instanced);
350    const bool ver_4_3 = (ver_4_2 &&
351                          consts->GLSLVersion >= 430 &&
352                          consts->Program[MESA_SHADER_VERTEX].MaxUniformBlocks >= 14 &&
353                          extensions->ARB_ES3_compatibility &&
354                          extensions->ARB_arrays_of_arrays &&
355                          extensions->ARB_compute_shader &&
356                          extensions->ARB_copy_image &&
357                          extensions->ARB_explicit_uniform_location &&
358                          extensions->ARB_fragment_layer_viewport &&
359                          extensions->ARB_framebuffer_no_attachments &&
360                          extensions->ARB_internalformat_query2 &&
361                          extensions->ARB_robust_buffer_access_behavior &&
362                          extensions->ARB_shader_image_size &&
363                          extensions->ARB_shader_storage_buffer_object &&
364                          extensions->ARB_stencil_texturing &&
365                          extensions->ARB_texture_buffer_range &&
366                          extensions->ARB_texture_query_levels &&
367                          extensions->ARB_texture_view);
368    const bool ver_4_4 = (ver_4_3 &&
369                          consts->GLSLVersion >= 440 &&
370                          consts->MaxVertexAttribStride >= 2048 &&
371                          extensions->ARB_buffer_storage &&
372                          extensions->ARB_clear_texture &&
373                          extensions->ARB_enhanced_layouts &&
374                          extensions->ARB_query_buffer_object &&
375                          extensions->ARB_texture_mirror_clamp_to_edge &&
376                          extensions->ARB_texture_stencil8 &&
377                          extensions->ARB_vertex_type_10f_11f_11f_rev);
378    const bool ver_4_5 = (ver_4_4 &&
379                          consts->GLSLVersion >= 450 &&
380                          extensions->ARB_ES3_1_compatibility &&
381                          extensions->ARB_clip_control &&
382                          extensions->ARB_conditional_render_inverted &&
383                          extensions->ARB_cull_distance &&
384                          extensions->ARB_derivative_control &&
385                          extensions->ARB_shader_texture_image_samples &&
386                          extensions->NV_texture_barrier);
387    const bool ver_4_6 = (ver_4_5 &&
388                          consts->GLSLVersion >= 460 &&
389                          extensions->ARB_gl_spirv &&
390                          extensions->ARB_spirv_extensions &&
391                          extensions->ARB_indirect_parameters &&
392                          extensions->ARB_pipeline_statistics_query &&
393                          extensions->ARB_polygon_offset_clamp &&
394                          extensions->ARB_shader_atomic_counter_ops &&
395                          extensions->ARB_shader_draw_parameters &&
396                          extensions->ARB_shader_group_vote &&
397                          extensions->ARB_texture_filter_anisotropic &&
398                          extensions->ARB_transform_feedback_overflow_query);
399 
400    if (ver_4_6) {
401       major = 4;
402       minor = 6;
403    }
404    else if (ver_4_5) {
405       major = 4;
406       minor = 5;
407    }
408    else if (ver_4_4) {
409       major = 4;
410       minor = 4;
411    }
412    else if (ver_4_3) {
413       major = 4;
414       minor = 3;
415    }
416    else if (ver_4_2) {
417       major = 4;
418       minor = 2;
419    }
420    else if (ver_4_1) {
421       major = 4;
422       minor = 1;
423    }
424    else if (ver_4_0) {
425       major = 4;
426       minor = 0;
427    }
428    else if (ver_3_3) {
429       major = 3;
430       minor = 3;
431    }
432    else if (ver_3_2) {
433       major = 3;
434       minor = 2;
435    }
436    else if (ver_3_1) {
437       major = 3;
438       minor = 1;
439    }
440    else if (ver_3_0) {
441       major = 3;
442       minor = 0;
443    }
444    else if (ver_2_1) {
445       major = 2;
446       minor = 1;
447    }
448    else if (ver_2_0) {
449       major = 2;
450       minor = 0;
451    }
452    else if (ver_1_5) {
453       major = 1;
454       minor = 5;
455    }
456    else if (ver_1_4) {
457       major = 1;
458       minor = 4;
459    }
460    else if (ver_1_3) {
461       major = 1;
462       minor = 3;
463    }
464    else {
465       major = 1;
466       minor = 2;
467    }
468 
469    version = major * 10 + minor;
470 
471    if (api == API_OPENGL_CORE && version < 31)
472       return 0;
473 
474    return version;
475 }
476 
477 static GLuint
compute_version_es1(const struct gl_extensions * extensions)478 compute_version_es1(const struct gl_extensions *extensions)
479 {
480    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
481    const bool ver_1_0 = (extensions->ARB_texture_env_combine &&
482                          extensions->ARB_texture_env_dot3);
483    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
484    const bool ver_1_1 = (ver_1_0 &&
485                          extensions->EXT_point_parameters);
486 
487    if (ver_1_1) {
488       return 11;
489    } else if (ver_1_0) {
490       return 10;
491    } else {
492       return 0;
493    }
494 }
495 
496 static GLuint
compute_version_es2(const struct gl_extensions * extensions,const struct gl_constants * consts)497 compute_version_es2(const struct gl_extensions *extensions,
498                     const struct gl_constants *consts)
499 {
500    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
501    const bool ver_2_0 = (extensions->ARB_texture_cube_map &&
502                          extensions->EXT_blend_color &&
503                          extensions->EXT_blend_func_separate &&
504                          extensions->EXT_blend_minmax &&
505                          extensions->ARB_vertex_shader &&
506                          extensions->ARB_fragment_shader &&
507                          extensions->ARB_texture_non_power_of_two &&
508                          extensions->EXT_blend_equation_separate);
509    /* FINISHME: This list isn't quite right. */
510    const bool ver_3_0 = (extensions->ARB_half_float_vertex &&
511                          extensions->ARB_internalformat_query &&
512                          extensions->ARB_map_buffer_range &&
513                          extensions->ARB_shader_texture_lod &&
514                          extensions->OES_texture_float &&
515                          extensions->OES_texture_half_float &&
516                          extensions->OES_texture_half_float_linear &&
517                          extensions->ARB_texture_rg &&
518                          extensions->ARB_depth_buffer_float &&
519                          extensions->ARB_framebuffer_object &&
520                          extensions->EXT_sRGB &&
521                          extensions->EXT_packed_float &&
522                          extensions->EXT_texture_array &&
523                          extensions->EXT_texture_shared_exponent &&
524                          extensions->EXT_texture_sRGB &&
525                          extensions->EXT_transform_feedback &&
526                          extensions->ARB_draw_instanced &&
527                          extensions->ARB_uniform_buffer_object &&
528                          extensions->EXT_texture_snorm &&
529                          (extensions->NV_primitive_restart ||
530                           consts->PrimitiveRestartFixedIndex) &&
531                          extensions->OES_depth_texture_cube_map &&
532                          extensions->EXT_texture_type_2_10_10_10_REV);
533    const bool es31_compute_shader =
534       consts->MaxComputeWorkGroupInvocations >= 128;
535    const bool ver_3_1 = (ver_3_0 &&
536                          consts->MaxVertexAttribStride >= 2048 &&
537                          extensions->ARB_arrays_of_arrays &&
538                          es31_compute_shader &&
539                          extensions->ARB_draw_indirect &&
540                          extensions->ARB_explicit_uniform_location &&
541                          extensions->ARB_framebuffer_no_attachments &&
542                          extensions->ARB_shader_atomic_counters &&
543                          extensions->ARB_shader_image_load_store &&
544                          extensions->ARB_shader_image_size &&
545                          extensions->ARB_shader_storage_buffer_object &&
546                          extensions->ARB_shading_language_packing &&
547                          extensions->ARB_stencil_texturing &&
548                          extensions->ARB_texture_multisample &&
549                          extensions->ARB_texture_gather &&
550                          extensions->MESA_shader_integer_functions &&
551                          extensions->EXT_shader_integer_mix);
552    const bool ver_3_2 = (ver_3_1 &&
553                          extensions->EXT_draw_buffers2 &&
554                          extensions->KHR_blend_equation_advanced &&
555                          extensions->KHR_robustness &&
556                          extensions->KHR_texture_compression_astc_ldr &&
557                          extensions->OES_copy_image &&
558                          extensions->ARB_draw_buffers_blend &&
559                          extensions->ARB_draw_elements_base_vertex &&
560                          extensions->OES_geometry_shader &&
561                          extensions->OES_primitive_bounding_box &&
562                          extensions->OES_sample_variables &&
563                          extensions->ARB_tessellation_shader &&
564                          extensions->ARB_texture_border_clamp &&
565                          extensions->OES_texture_buffer &&
566                          extensions->OES_texture_cube_map_array &&
567                          extensions->ARB_texture_stencil8);
568 
569    if (ver_3_2) {
570       return 32;
571    } else if (ver_3_1) {
572       return 31;
573    } else if (ver_3_0) {
574       return 30;
575    } else if (ver_2_0) {
576       return 20;
577    } else {
578       return 0;
579    }
580 }
581 
582 GLuint
_mesa_get_version(const struct gl_extensions * extensions,struct gl_constants * consts,gl_api api)583 _mesa_get_version(const struct gl_extensions *extensions,
584                   struct gl_constants *consts, gl_api api)
585 {
586    switch (api) {
587    case API_OPENGL_COMPAT:
588       /* Disable higher GLSL versions for legacy contexts.
589        * This disallows creation of higher compatibility contexts. */
590       if (!consts->AllowHigherCompatVersion) {
591          consts->GLSLVersion = consts->GLSLVersionCompat;
592       }
593       /* fall through */
594    case API_OPENGL_CORE:
595       return compute_version(extensions, consts, api);
596    case API_OPENGLES:
597       return compute_version_es1(extensions);
598    case API_OPENGLES2:
599       return compute_version_es2(extensions, consts);
600    }
601    return 0;
602 }
603 
604 /**
605  * Set the context's Version and VersionString fields.
606  * This should only be called once as part of context initialization
607  * or to perform version check for GLX_ARB_create_context_profile.
608  */
609 void
_mesa_compute_version(struct gl_context * ctx)610 _mesa_compute_version(struct gl_context *ctx)
611 {
612    if (ctx->Version)
613       goto done;
614 
615    ctx->Version = _mesa_get_version(&ctx->Extensions, &ctx->Const, ctx->API);
616    ctx->Extensions.Version = ctx->Version;
617 
618    /* Make sure that the GLSL version lines up with the GL version. In some
619     * cases it can be too high, e.g. if an extension is missing.
620     */
621    if (_mesa_is_desktop_gl(ctx)) {
622       switch (ctx->Version) {
623       case 20:
624          /* fall-through, GLSL 1.20 is the minimum we support */
625       case 21:
626          ctx->Const.GLSLVersion = 120;
627          break;
628       case 30:
629          ctx->Const.GLSLVersion = 130;
630          break;
631       case 31:
632          ctx->Const.GLSLVersion = 140;
633          break;
634       case 32:
635          ctx->Const.GLSLVersion = 150;
636          break;
637       default:
638          if (ctx->Version >= 33)
639             ctx->Const.GLSLVersion = ctx->Version * 10;
640          break;
641       }
642    }
643 
644    switch (ctx->API) {
645    case API_OPENGL_COMPAT:
646    case API_OPENGL_CORE:
647       create_version_string(ctx, "");
648       break;
649 
650    case API_OPENGLES:
651       if (!ctx->Version) {
652          _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
653          return;
654       }
655       create_version_string(ctx, "OpenGL ES-CM ");
656       break;
657 
658    case API_OPENGLES2:
659       if (!ctx->Version) {
660          _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
661          return;
662       }
663       create_version_string(ctx, "OpenGL ES ");
664       break;
665    }
666 
667 done:
668    if (ctx->API == API_OPENGL_COMPAT && ctx->Version >= 31)
669       ctx->Extensions.ARB_compatibility = GL_TRUE;
670 }
671 
672 
673 void
_mesa_get_driver_uuid(struct gl_context * ctx,GLint * uuid)674 _mesa_get_driver_uuid(struct gl_context *ctx, GLint *uuid)
675 {
676    ctx->Driver.GetDriverUuid(ctx, (char*) uuid);
677 }
678 
679 void
_mesa_get_device_uuid(struct gl_context * ctx,GLint * uuid)680 _mesa_get_device_uuid(struct gl_context *ctx, GLint *uuid)
681 {
682    ctx->Driver.GetDeviceUuid(ctx, (char*) uuid);
683 }
684 
685 /**
686  * Get the i-th GLSL version string.  If index=0, return the most recent
687  * supported version.
688  * \param ctx context to query
689  * \param index  which version string to return, or -1 if none
690  * \param versionOut returns the vesrion string
691  * \return total number of shading language versions.
692  */
693 int
_mesa_get_shading_language_version(const struct gl_context * ctx,int index,char ** versionOut)694 _mesa_get_shading_language_version(const struct gl_context *ctx,
695                                    int index,
696                                    char **versionOut)
697 {
698    int n = 0;
699 
700 #define GLSL_VERSION(S) \
701    if (n++ == index) \
702       *versionOut = S
703 
704    /* GLSL core */
705    if (ctx->Const.GLSLVersion >= 460)
706       GLSL_VERSION("460");
707    if (ctx->Const.GLSLVersion >= 450)
708       GLSL_VERSION("450");
709    if (ctx->Const.GLSLVersion >= 440)
710       GLSL_VERSION("440");
711    if (ctx->Const.GLSLVersion >= 430)
712       GLSL_VERSION("430");
713    if (ctx->Const.GLSLVersion >= 420)
714       GLSL_VERSION("420");
715    if (ctx->Const.GLSLVersion >= 410)
716       GLSL_VERSION("410");
717    if (ctx->Const.GLSLVersion >= 400)
718       GLSL_VERSION("400");
719    if (ctx->Const.GLSLVersion >= 330)
720       GLSL_VERSION("330");
721    if (ctx->Const.GLSLVersion >= 150)
722       GLSL_VERSION("150");
723    if (ctx->Const.GLSLVersion >= 140)
724       GLSL_VERSION("140");
725    if (ctx->Const.GLSLVersion >= 130)
726       GLSL_VERSION("130");
727    if (ctx->Const.GLSLVersion >= 120)
728       GLSL_VERSION("120");
729    /* The GL spec says to return the empty string for GLSL 1.10 */
730    if (ctx->Const.GLSLVersion >= 110)
731       GLSL_VERSION("");
732 
733    /* GLSL es */
734    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
735         ctx->Extensions.ARB_ES3_2_compatibility)
736       GLSL_VERSION("320 es");
737    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility)
738       GLSL_VERSION("310 es");
739    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility)
740       GLSL_VERSION("300 es");
741    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility)
742       GLSL_VERSION("100");
743 
744 #undef GLSL_VERSION
745 
746    return n;
747 }
748