aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/version.c
blob: b3ae3f5e811a7897166b9a9671d913b3516e2acf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */


#include "imports.h"
#include "mtypes.h"
#include "version.h"
/*#include "git_sha1.h"*/

/**
 * Scans 'string' to see if it ends with 'ending'.
 */
static GLboolean
check_for_ending(const char *string, const char *ending)
{
   int len1, len2;

   len1 = strlen(string);
   len2 = strlen(ending);

   if (len2 > len1) {
      return GL_FALSE;
   }

   if (strcmp(string + (len1 - len2), ending) == 0) {
      return GL_TRUE;
   } else {
      return GL_FALSE;
   }
}

/**
 * Returns the gl override data
 *
 * version > 0 indicates there is an override requested
 * fwd_context is only valid if version > 0
 */
static void
get_gl_override(int *version, GLboolean *fwd_context)
{
   const char *env_var = "MESA_GL_VERSION_OVERRIDE";
   const char *version_str;
   int major, minor, n;
   static int override_version = -1;
   static GLboolean fc_suffix = GL_FALSE;

   if (override_version < 0) {
      override_version = 0;

      version_str = getenv(env_var);
      if (version_str) {
         fc_suffix = check_for_ending(version_str, "FC");

         n = sscanf(version_str, "%u.%u", &major, &minor);
         if (n != 2) {
            fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version_str);
            override_version = 0;
         } else {
            override_version = major * 10 + minor;
            if (override_version < 30 && fc_suffix) {
               fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version_str);
            }
         }
      }
   }

   *version = override_version;
   *fwd_context = fc_suffix;
}

/**
 * Builds the MESA version string.
 */
static void
create_version_string(struct gl_context *ctx, const char *prefix)
{
   static const int max = 100;

   ctx->VersionString = malloc(max);
   if (ctx->VersionString) {
      _mesa_snprintf(ctx->VersionString, max,
		     "%s%u.%u%s Mesa " PACKAGE_VERSION
#ifdef MESA_GIT_SHA1
		     " (" MESA_GIT_SHA1 ")"
#endif
		     ,
		     prefix,
		     ctx->Version / 10, ctx->Version % 10,
		     (ctx->API == API_OPENGL_CORE) ? " (Core Profile)" : ""
		     );
   }
}

/**
 * Override the context's version and/or API type if the
 * environment variable MESA_GL_VERSION_OVERRIDE is set.
 *
 * Example uses of MESA_GL_VERSION_OVERRIDE:
 *
 * 2.1: select a compatibility (non-Core) profile with GL version 2.1
 * 3.0: select a compatibility (non-Core) profile with GL version 3.0
 * 3.0FC: select a Core+Forward Compatible profile with GL version 3.0
 * 3.1: select a Core profile with GL version 3.1
 * 3.1FC: select a Core+Forward Compatible profile with GL version 3.1
 */
void
_mesa_override_gl_version(struct gl_context *ctx)
{
   int version;
   GLboolean fwd_context;

   get_gl_override(&version, &fwd_context);

   if (version > 0) {
      ctx->Version = version;
      if (version >= 30 && fwd_context) {
         ctx->API = API_OPENGL_CORE;
         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
      } else if (version >= 31) {
         ctx->API = API_OPENGL_CORE;
      } else {
         ctx->API = API_OPENGL_COMPAT;
      }
      create_version_string(ctx, "");
   }
}

/**
 * Returns the gl override value
 *
 * version > 0 indicates there is an override requested
 */
int
_mesa_get_gl_version_override(void)
{
   int version;
   GLboolean fwd_context;

   get_gl_override(&version, &fwd_context);

   return version;
}

/**
 * Override the context's GLSL version if the environment variable
 * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
 * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
 */
void
_mesa_override_glsl_version(struct gl_context *ctx)
{
   const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
   const char *version;
   int n;

   version = getenv(env_var);
   if (!version) {
      return;
   }

   n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
   if (n != 1) {
      fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
      return;
   }
}

/**
 * Examine enabled GL extensions to determine GL version.
 */
static void
compute_version(struct gl_context *ctx)
{
   GLuint major, minor;

   const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
                              ctx->Extensions.ARB_texture_cube_map &&
                              ctx->Extensions.ARB_texture_env_combine &&
                              ctx->Extensions.ARB_texture_env_dot3);
   const GLboolean ver_1_4 = (ver_1_3 &&
                              ctx->Extensions.ARB_depth_texture &&
                              ctx->Extensions.ARB_shadow &&
                              ctx->Extensions.ARB_texture_env_crossbar &&
                              ctx->Extensions.EXT_blend_color &&
                              ctx->Extensions.EXT_blend_func_separate &&
                              ctx->Extensions.EXT_blend_minmax &&
                              ctx->Extensions.EXT_point_parameters);
   const GLboolean ver_1_5 = (ver_1_4 &&
                              ctx->Extensions.ARB_occlusion_query);
   const GLboolean ver_2_0 = (ver_1_5 &&
                              ctx->Extensions.ARB_point_sprite &&
                              ctx->Extensions.ARB_vertex_shader &&
                              ctx->Extensions.ARB_fragment_shader &&
                              ctx->Extensions.ARB_texture_non_power_of_two &&
                              ctx->Extensions.EXT_blend_equation_separate &&

			      /* Technically, 2.0 requires the functionality
			       * of the EXT version.  Enable 2.0 if either
			       * extension is available, and assume that a
			       * driver that only exposes the ATI extension
			       * will fallback to software when necessary.
			       */
			      (ctx->Extensions.EXT_stencil_two_side
			       || ctx->Extensions.ATI_separate_stencil));
   const GLboolean ver_2_1 = (ver_2_0 &&
                              ctx->Extensions.EXT_pixel_buffer_object &&
                              ctx->Extensions.EXT_texture_sRGB);
   const GLboolean ver_3_0 = (ver_2_1 &&
                              ctx->Const.GLSLVersion >= 130 &&
                              (ctx->Const.MaxSamples >= 4 || ctx->Const.FakeSWMSAA) &&
                              (ctx->API == API_OPENGL_CORE ||
                               ctx->Extensions.ARB_color_buffer_float) &&
                              ctx->Extensions.ARB_depth_buffer_float &&
                              ctx->Extensions.ARB_half_float_vertex &&
                              ctx->Extensions.ARB_map_buffer_range &&
                              ctx->Extensions.ARB_shader_texture_lod &&
                              ctx->Extensions.ARB_texture_float &&
                              ctx->Extensions.ARB_texture_rg &&
                              ctx->Extensions.ARB_texture_compression_rgtc &&
                              ctx->Extensions.EXT_draw_buffers2 &&
                              ctx->Extensions.ARB_framebuffer_object &&
                              ctx->Extensions.EXT_framebuffer_sRGB &&
                              ctx->Extensions.EXT_packed_float &&
                              ctx->Extensions.EXT_texture_array &&
                              ctx->Extensions.EXT_texture_shared_exponent &&
                              ctx->Extensions.EXT_transform_feedback &&
                              ctx->Extensions.NV_conditional_render);
   const GLboolean ver_3_1 = (ver_3_0 &&
                              ctx->Const.GLSLVersion >= 140 &&
                              ctx->Extensions.ARB_draw_instanced &&
                              ctx->Extensions.ARB_texture_buffer_object &&
                              ctx->Extensions.ARB_uniform_buffer_object &&
                              ctx->Extensions.EXT_texture_snorm &&
                              ctx->Extensions.NV_primitive_restart &&
                              ctx->Extensions.NV_texture_rectangle &&
                              ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits >= 16);
   const GLboolean ver_3_2 = (ver_3_1 &&
                              ctx->Const.GLSLVersion >= 150 &&
                              ctx->Extensions.ARB_depth_clamp &&
                              ctx->Extensions.ARB_draw_elements_base_vertex &&
                              ctx->Extensions.ARB_fragment_coord_conventions &&
                              ctx->Extensions.EXT_provoking_vertex &&
                              ctx->Extensions.ARB_seamless_cube_map &&
                              ctx->Extensions.ARB_sync &&
                              ctx->Extensions.ARB_texture_multisample &&
                              ctx->Extensions.EXT_vertex_array_bgra);
   const GLboolean ver_3_3 = (ver_3_2 &&
                              ctx->Const.GLSLVersion >= 330 &&
                              ctx->Extensions.ARB_blend_func_extended &&
                              ctx->Extensions.ARB_explicit_attrib_location &&
                              ctx->Extensions.ARB_instanced_arrays &&
                              ctx->Extensions.ARB_occlusion_query2 &&
                              ctx->Extensions.ARB_shader_bit_encoding &&
                              ctx->Extensions.ARB_texture_rgb10_a2ui &&
                              ctx->Extensions.ARB_timer_query &&
                              ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
                              ctx->Extensions.EXT_texture_swizzle);
                              /* ARB_sampler_objects is always enabled in mesa */

   if (ver_3_3) {
      major = 3;
      minor = 3;
   }
   else if (ver_3_2) {
      major = 3;
      minor = 2;
   }
   else if (ver_3_1) {
      major = 3;
      minor = 1;
   }
   else if (ver_3_0) {
      major = 3;
      minor = 0;
   }
   else if (ver_2_1) {
      major = 2;
      minor = 1;
   }
   else if (ver_2_0) {
      major = 2;
      minor = 0;
   }
   else if (ver_1_5) {
      major = 1;
      minor = 5;
   }
   else if (ver_1_4) {
      major = 1;
      minor = 4;
   }
   else if (ver_1_3) {
      major = 1;
      minor = 3;
   }
   else {
      major = 1;
      minor = 2;
   }

   ctx->Version = major * 10 + minor;

   create_version_string(ctx, "");
}

static void
compute_version_es1(struct gl_context *ctx)
{
   /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
   const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
                              ctx->Extensions.ARB_texture_env_dot3);
   /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
   const GLboolean ver_1_1 = (ver_1_0 &&
                              ctx->Extensions.EXT_point_parameters);

   if (ver_1_1) {
      ctx->Version = 11;
   } else if (ver_1_0) {
      ctx->Version = 10;
   } else {
      _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
   }

   create_version_string(ctx, "OpenGL ES-CM ");
}

static void
compute_version_es2(struct gl_context *ctx)
{
   /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
   const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
                              ctx->Extensions.EXT_blend_color &&
                              ctx->Extensions.EXT_blend_func_separate &&
                              ctx->Extensions.EXT_blend_minmax &&
                              ctx->Extensions.ARB_vertex_shader &&
                              ctx->Extensions.ARB_fragment_shader &&
                              ctx->Extensions.ARB_texture_non_power_of_two &&
                              ctx->Extensions.EXT_blend_equation_separate);
   /* FINISHME: This list isn't quite right. */
   const GLboolean ver_3_0 = (ctx->Extensions.ARB_half_float_vertex &&
                              ctx->Extensions.ARB_internalformat_query &&
                              ctx->Extensions.ARB_map_buffer_range &&
                              ctx->Extensions.ARB_shader_texture_lod &&
                              ctx->Extensions.ARB_texture_float &&
                              ctx->Extensions.ARB_texture_rg &&
                              ctx->Extensions.ARB_texture_compression_rgtc &&
                              ctx->Extensions.EXT_draw_buffers2 &&
                              /* ctx->Extensions.ARB_framebuffer_object && */
                              ctx->Extensions.EXT_framebuffer_sRGB &&
                              ctx->Extensions.EXT_packed_float &&
                              ctx->Extensions.EXT_texture_array &&
                              ctx->Extensions.EXT_texture_shared_exponent &&
                              ctx->Extensions.EXT_transform_feedback &&
                              ctx->Extensions.NV_conditional_render &&
                              ctx->Extensions.ARB_draw_instanced &&
                              ctx->Extensions.ARB_uniform_buffer_object &&
                              ctx->Extensions.EXT_texture_snorm &&
                              ctx->Extensions.NV_primitive_restart &&
                              ctx->Extensions.OES_depth_texture_cube_map);
   if (ver_3_0) {
      ctx->Version = 30;
   } else if (ver_2_0) {
      ctx->Version = 20;
   } else {
      _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
   }

   create_version_string(ctx, "OpenGL ES ");
}

/**
 * Set the context's Version and VersionString fields.
 * This should only be called once as part of context initialization
 * or to perform version check for GLX_ARB_create_context_profile.
 */
void
_mesa_compute_version(struct gl_context *ctx)
{
   if (ctx->Version)
      return;

   switch (ctx->API) {
   case API_OPENGL_COMPAT:
      /* Disable GLSL 1.40 and later for legacy contexts.
       * This disallows creation of the GL 3.1 compatibility context. */
      if (ctx->Const.GLSLVersion > 130) {
         ctx->Const.GLSLVersion = 130;
      }
      /* fall through */
   case API_OPENGL_CORE:
      compute_version(ctx);
      break;
   case API_OPENGLES:
      compute_version_es1(ctx);
      break;
   case API_OPENGLES2:
      compute_version_es2(ctx);
      break;
   }

}