aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/pipelineobj.c
blob: f55251e065dd3a5a6c37ee2f9b5843a413b69510 (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
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
/*
 * Mesa 3-D graphics library
 *
 * Copyright © 2013 Gregory Hainaut <gregory.hainaut@gmail.com>
 *
 * 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 (including the next
 * paragraph) 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.
 */

/**
 * \file pipelineobj.c
 * \author Hainaut Gregory <gregory.hainaut@gmail.com>
 *
 * Implementation of pipeline object related API functions. Based on
 * GL_ARB_separate_shader_objects extension.
 */

#include "main/glheader.h"
#include "main/context.h"
#include "main/dispatch.h"
#include "main/enums.h"
#include "main/hash.h"
#include "main/mtypes.h"
#include "main/pipelineobj.h"
#include "main/shaderapi.h"
#include "main/shaderobj.h"
#include "main/transformfeedback.h"
#include "main/uniforms.h"
#include "program/program.h"
#include "program/prog_parameter.h"
#include "ralloc.h"
#include <stdbool.h>
#include "../glsl/glsl_parser_extras.h"
#include "../glsl/ir_uniform.h"

/**
 * Delete a pipeline object.
 */
void
_mesa_delete_pipeline_object(struct gl_context *ctx,
                             struct gl_pipeline_object *obj)
{
   unsigned i;

   _mesa_reference_shader_program(ctx, &obj->_CurrentFragmentProgram, NULL);

   for (i = 0; i < MESA_SHADER_STAGES; i++)
      _mesa_reference_shader_program(ctx, &obj->CurrentProgram[i], NULL);

   _mesa_reference_shader_program(ctx, &obj->ActiveProgram, NULL);
   mtx_destroy(&obj->Mutex);
   ralloc_free(obj);
}

/**
 * Allocate and initialize a new pipeline object.
 */
static struct gl_pipeline_object *
_mesa_new_pipeline_object(struct gl_context *ctx, GLuint name)
{
   struct gl_pipeline_object *obj = rzalloc(NULL, struct gl_pipeline_object);
   if (obj) {
      obj->Name = name;
      mtx_init(&obj->Mutex, mtx_plain);
      obj->RefCount = 1;
      obj->Flags = _mesa_get_shader_flags();
      obj->InfoLog = NULL;
   }

   return obj;
}

/**
 * Initialize pipeline object state for given context.
 */
void
_mesa_init_pipeline(struct gl_context *ctx)
{
   ctx->Pipeline.Objects = _mesa_NewHashTable();

   ctx->Pipeline.Current = NULL;

   /* Install a default Pipeline */
   ctx->Pipeline.Default = _mesa_new_pipeline_object(ctx, 0);
   _mesa_reference_pipeline_object(ctx, &ctx->_Shader, ctx->Pipeline.Default);
}


/**
 * Callback for deleting a pipeline object.  Called by _mesa_HashDeleteAll().
 */
static void
delete_pipelineobj_cb(GLuint id, void *data, void *userData)
{
   struct gl_pipeline_object *obj = (struct gl_pipeline_object *) data;
   struct gl_context *ctx = (struct gl_context *) userData;
   _mesa_delete_pipeline_object(ctx, obj);
}


/**
 * Free pipeline state for given context.
 */
void
_mesa_free_pipeline_data(struct gl_context *ctx)
{
   _mesa_HashDeleteAll(ctx->Pipeline.Objects, delete_pipelineobj_cb, ctx);
   _mesa_DeleteHashTable(ctx->Pipeline.Objects);

   _mesa_reference_pipeline_object(ctx, &ctx->_Shader, NULL);
   _mesa_delete_pipeline_object(ctx, ctx->Pipeline.Default);

}

/**
 * Look up the pipeline object for the given ID.
 *
 * \returns
 * Either a pointer to the pipeline object with the specified ID or \c NULL for
 * a non-existent ID.  The spec defines ID 0 as being technically
 * non-existent.
 */
static inline struct gl_pipeline_object *
lookup_pipeline_object(struct gl_context *ctx, GLuint id)
{
   if (id == 0)
      return NULL;
   else
      return (struct gl_pipeline_object *)
         _mesa_HashLookup(ctx->Pipeline.Objects, id);
}

/**
 * Add the given pipeline object to the pipeline object pool.
 */
static void
save_pipeline_object(struct gl_context *ctx, struct gl_pipeline_object *obj)
{
   if (obj->Name > 0) {
      _mesa_HashInsert(ctx->Pipeline.Objects, obj->Name, obj);
   }
}

/**
 * Remove the given pipeline object from the pipeline object pool.
 * Do not deallocate the pipeline object though.
 */
static void
remove_pipeline_object(struct gl_context *ctx, struct gl_pipeline_object *obj)
{
   if (obj->Name > 0) {
      _mesa_HashRemove(ctx->Pipeline.Objects, obj->Name);
   }
}

/**
 * Set ptr to obj w/ reference counting.
 * Note: this should only be called from the _mesa_reference_pipeline_object()
 * inline function.
 */
void
_mesa_reference_pipeline_object_(struct gl_context *ctx,
                                 struct gl_pipeline_object **ptr,
                                 struct gl_pipeline_object *obj)
{
   assert(*ptr != obj);

   if (*ptr) {
      /* Unreference the old pipeline object */
      GLboolean deleteFlag = GL_FALSE;
      struct gl_pipeline_object *oldObj = *ptr;

      mtx_lock(&oldObj->Mutex);
      ASSERT(oldObj->RefCount > 0);
      oldObj->RefCount--;
      deleteFlag = (oldObj->RefCount == 0);
      mtx_unlock(&oldObj->Mutex);

      if (deleteFlag) {
         _mesa_delete_pipeline_object(ctx, oldObj);
      }

      *ptr = NULL;
   }
   ASSERT(!*ptr);

   if (obj) {
      /* reference new pipeline object */
      mtx_lock(&obj->Mutex);
      if (obj->RefCount == 0) {
         /* this pipeline's being deleted (look just above) */
         /* Not sure this can ever really happen.  Warn if it does. */
         _mesa_problem(NULL, "referencing deleted pipeline object");
         *ptr = NULL;
      }
      else {
         obj->RefCount++;
         *ptr = obj;
      }
      mtx_unlock(&obj->Mutex);
   }
}

/**
 * Bound program to severals stages of the pipeline
 */
void GLAPIENTRY
_mesa_UseProgramStages(GLuint pipeline, GLbitfield stages, GLuint program)
{
   GET_CURRENT_CONTEXT(ctx);

   struct gl_pipeline_object *pipe = lookup_pipeline_object(ctx, pipeline);
   struct gl_shader_program *shProg = NULL;
   GLbitfield any_valid_stages;

   if (!pipe) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glUseProgramStages(pipeline)");
      return;
   }

   /* Object is created by any Pipeline call but glGenProgramPipelines,
    * glIsProgramPipeline and GetProgramPipelineInfoLog
    */
   pipe->EverBound = GL_TRUE;

   /* Section 2.11.4 (Program Pipeline Objects) of the OpenGL 4.1 spec says:
    *
    *     "If stages is not the special value ALL_SHADER_BITS, and has a bit
    *     set that is not recognized, the error INVALID_VALUE is generated."
    *
    * NOT YET SUPPORTED:
    * GL_TESS_CONTROL_SHADER_BIT
    * GL_TESS_EVALUATION_SHADER_BIT
    */
   any_valid_stages = GL_VERTEX_SHADER_BIT | GL_FRAGMENT_SHADER_BIT;
   if (_mesa_has_geometry_shaders(ctx))
      any_valid_stages |= GL_GEOMETRY_SHADER_BIT;

   if (stages != GL_ALL_SHADER_BITS && (stages & ~any_valid_stages) != 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glUseProgramStages(Stages)");
      return;
   }

   /* Section 2.17.2 (Transform Feedback Primitive Capture) of the OpenGL 4.1
    * spec says:
    *
    *     "The error INVALID_OPERATION is generated:
    *
    *      ...
    *
    *         - by UseProgramStages if the program pipeline object it refers
    *           to is current and the current transform feedback object is
    *           active and not paused;
    */
   if (ctx->_Shader == pipe) {
      if (_mesa_is_xfb_active_and_unpaused(ctx)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
               "glUseProgramStages(transform feedback active)");
         return;
      }
   }

   if (program) {
      shProg = _mesa_lookup_shader_program_err(ctx, program,
                                               "glUseProgramStages");
      if (shProg == NULL)
         return;

      /* Section 2.11.4 (Program Pipeline Objects) of the OpenGL 4.1 spec
       * says:
       *
       *     "If the program object named by program was linked without the
       *     PROGRAM_SEPARABLE parameter set, or was not linked successfully,
       *     the error INVALID_OPERATION is generated and the corresponding
       *     shader stages in the pipeline program pipeline object are not
       *     modified."
       */
      if (!shProg->LinkStatus) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glUseProgramStages(program not linked)");
         return;
      }

      if (!shProg->SeparateShader) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glUseProgramStages(program wasn't linked with the "
                     "PROGRAM_SEPARABLE flag)");
         return;
      }
   }

   /* Enable individual stages from the program as requested by the
    * application.  If there is no shader for a requested stage in the
    * program, _mesa_use_shader_program will enable fixed-function processing
    * as dictated by the spec.
    *
    * Section 2.11.4 (Program Pipeline Objects) of the OpenGL 4.1 spec
    * says:
    *
    *     "If UseProgramStages is called with program set to zero or with a
    *     program object that contains no executable code for the given
    *     stages, it is as if the pipeline object has no programmable stage
    *     configured for the indicated shader stages."
    */
   if ((stages & GL_VERTEX_SHADER_BIT) != 0)
      _mesa_use_shader_program(ctx, GL_VERTEX_SHADER, shProg, pipe);

   if ((stages & GL_FRAGMENT_SHADER_BIT) != 0)
      _mesa_use_shader_program(ctx, GL_FRAGMENT_SHADER, shProg, pipe);

   if ((stages & GL_GEOMETRY_SHADER_BIT) != 0)
      _mesa_use_shader_program(ctx, GL_GEOMETRY_SHADER, shProg, pipe);
}

/**
 * Use the named shader program for subsequent glUniform calls (if pipeline
 * bound)
 */
void GLAPIENTRY
_mesa_ActiveShaderProgram(GLuint pipeline, GLuint program)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_shader_program *shProg = NULL;
   struct gl_pipeline_object *pipe = lookup_pipeline_object(ctx, pipeline);

   if (program != 0) {
      shProg = _mesa_lookup_shader_program_err(ctx, program,
                                               "glActiveShaderProgram(program)");
      if (shProg == NULL)
         return;
   }

   if (!pipe) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glActiveShaderProgram(pipeline)");
      return;
   }

   /* Object is created by any Pipeline call but glGenProgramPipelines,
    * glIsProgramPipeline and GetProgramPipelineInfoLog
    */
   pipe->EverBound = GL_TRUE;

   if ((shProg != NULL) && !shProg->LinkStatus) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
            "glActiveShaderProgram(program %u not linked)", shProg->Name);
      return;
   }

   _mesa_reference_shader_program(ctx, &pipe->ActiveProgram, shProg);
}

/**
 * Make program of the pipeline current
 */
void GLAPIENTRY
_mesa_BindProgramPipeline(GLuint pipeline)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_pipeline_object *newObj = NULL;

   /* Rebinding the same pipeline object: no change.
    */
   if (ctx->_Shader->Name == pipeline)
      return;

   /* Section 2.17.2 (Transform Feedback Primitive Capture) of the OpenGL 4.1
    * spec says:
    *
    *     "The error INVALID_OPERATION is generated:
    *
    *      ...
    *
    *         - by BindProgramPipeline if the current transform feedback
    *           object is active and not paused;
    */
   if (_mesa_is_xfb_active_and_unpaused(ctx)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
            "glBindProgramPipeline(transform feedback active)");
      return;
   }

   /* Get pointer to new pipeline object (newObj)
    */
   if (pipeline) {
      /* non-default pipeline object */
      newObj = lookup_pipeline_object(ctx, pipeline);
      if (!newObj) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glBindProgramPipeline(non-gen name)");
         return;
      }

      /* Object is created by any Pipeline call but glGenProgramPipelines,
       * glIsProgramPipeline and GetProgramPipelineInfoLog
       */
      newObj->EverBound = GL_TRUE;
   }

   /* First bind the Pipeline to pipeline binding point */
   _mesa_reference_pipeline_object(ctx, &ctx->Pipeline.Current, newObj);

   /* Section 2.11.3 (Program Objects) of the OpenGL 4.1 spec says:
    *
    *     "If there is a current program object established by UseProgram,
    *     that program is considered current for all stages. Otherwise, if
    *     there is a bound program pipeline object (see section 2.11.4), the
    *     program bound to the appropriate stage of the pipeline object is
    *     considered current."
    */
   if (&ctx->Shader != ctx->_Shader) {
      if (pipeline) {
         /* Bound the pipeline to the current program and
          * restore the pipeline state
          */
         _mesa_reference_pipeline_object(ctx, &ctx->_Shader, newObj);
      } else {
         /* Unbind the pipeline */
         _mesa_reference_pipeline_object(ctx, &ctx->_Shader,
                                         ctx->Pipeline.Default);
      }

      FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);

      if (ctx->Driver.UseProgram)
         ctx->Driver.UseProgram(ctx, NULL);
   }
}

/**
 * Delete a set of pipeline objects.
 *
 * \param n      Number of pipeline objects to delete.
 * \param ids    pipeline of \c n pipeline object IDs.
 */
void GLAPIENTRY
_mesa_DeleteProgramPipelines(GLsizei n, const GLuint *pipelines)
{
   GET_CURRENT_CONTEXT(ctx);
   GLsizei i;

   if (n < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteProgramPipelines(n<0)");
      return;
   }

   for (i = 0; i < n; i++) {
      struct gl_pipeline_object *obj =
         lookup_pipeline_object(ctx, pipelines[i]);

      if (obj) {
         ASSERT(obj->Name == pipelines[i]);

         /* If the pipeline object is currently bound, the spec says "If an
          * object that is currently bound is deleted, the binding for that
          * object reverts to zero and no program pipeline object becomes
          * current."
          */
         if (obj == ctx->Pipeline.Current) {
            _mesa_BindProgramPipeline(0);
         }

         /* The ID is immediately freed for re-use */
         remove_pipeline_object(ctx, obj);

         /* Unreference the pipeline object.
          * If refcount hits zero, the object will be deleted.
          */
         _mesa_reference_pipeline_object(ctx, &obj, NULL);
      }
   }
}

/**
 * Generate a set of unique pipeline object IDs and store them in \c pipelines.
 * \param n       Number of IDs to generate.
 * \param pipelines  pipeline of \c n locations to store the IDs.
 */
void GLAPIENTRY
_mesa_GenProgramPipelines(GLsizei n, GLuint *pipelines)
{
   GET_CURRENT_CONTEXT(ctx);

   GLuint first;
   GLint i;

   if (n < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glGenProgramPipelines(n<0)");
      return;
   }

   if (!pipelines) {
      return;
   }

   first = _mesa_HashFindFreeKeyBlock(ctx->Pipeline.Objects, n);

   for (i = 0; i < n; i++) {
      struct gl_pipeline_object *obj;
      GLuint name = first + i;

      obj = _mesa_new_pipeline_object(ctx, name);
      if (!obj) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenProgramPipelines");
         return;
      }

      save_pipeline_object(ctx, obj);
      pipelines[i] = first + i;
   }

}

/**
 * Determine if ID is the name of an pipeline object.
 *
 * \param id  ID of the potential pipeline object.
 * \return  \c GL_TRUE if \c id is the name of a pipeline object,
 *          \c GL_FALSE otherwise.
 */
GLboolean GLAPIENTRY
_mesa_IsProgramPipeline(GLuint pipeline)
{
   GET_CURRENT_CONTEXT(ctx);

   struct gl_pipeline_object *obj = lookup_pipeline_object(ctx, pipeline);
   if (obj == NULL)
      return GL_FALSE;

   return obj->EverBound;
}

/**
 * glGetProgramPipelineiv() - get pipeline shader state.
 */
void GLAPIENTRY
_mesa_GetProgramPipelineiv(GLuint pipeline, GLenum pname, GLint *params)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_pipeline_object *pipe = lookup_pipeline_object(ctx, pipeline);

   /* Are geometry shaders available in this context?
    */
   const bool has_gs = _mesa_has_geometry_shaders(ctx);

   if (!pipe) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glGetProgramPipelineiv(pipeline)");
      return;
   }

   /* Object is created by any Pipeline call but glGenProgramPipelines,
    * glIsProgramPipeline and GetProgramPipelineInfoLog
    */
   pipe->EverBound = GL_TRUE;

   switch (pname) {
   case GL_ACTIVE_PROGRAM:
      *params = pipe->ActiveProgram ? pipe->ActiveProgram->Name : 0;
      return;
   case GL_INFO_LOG_LENGTH:
      *params = pipe->InfoLog ? strlen(pipe->InfoLog) + 1 : 0;
      return;
   case GL_VALIDATE_STATUS:
      *params = pipe->Validated;
      return;
   case GL_VERTEX_SHADER:
      *params = pipe->CurrentProgram[MESA_SHADER_VERTEX]
         ? pipe->CurrentProgram[MESA_SHADER_VERTEX]->Name : 0;
      return;
   case GL_TESS_EVALUATION_SHADER:
      /* NOT YET SUPPORTED */
      break;
   case GL_TESS_CONTROL_SHADER:
      /* NOT YET SUPPORTED */
      break;
   case GL_GEOMETRY_SHADER:
      if (!has_gs)
         break;
      *params = pipe->CurrentProgram[MESA_SHADER_GEOMETRY]
         ? pipe->CurrentProgram[MESA_SHADER_GEOMETRY]->Name : 0;
      return;
   case GL_FRAGMENT_SHADER:
      *params = pipe->CurrentProgram[MESA_SHADER_FRAGMENT]
         ? pipe->CurrentProgram[MESA_SHADER_FRAGMENT]->Name : 0;
      return;
   default:
      break;
   }

   _mesa_error(ctx, GL_INVALID_ENUM, "glGetProgramPipelineiv(pname=%s)",
               _mesa_lookup_enum_by_nr(pname));
}

/**
 * Determines whether every stage in a linked program is active in the
 * specified pipeline.
 */
static bool
program_stages_all_active(struct gl_pipeline_object *pipe,
                          const struct gl_shader_program *prog)
{
   unsigned i;
   bool status = true;

   if (!prog)
      return true;

   for (i = 0; i < MESA_SHADER_STAGES; i++) {
      if (prog->_LinkedShaders[i]) {
         if (pipe->CurrentProgram[i]) {
            if (prog->Name != pipe->CurrentProgram[i]->Name) {
               status = false;
            }
         } else {
            status = false;
         }
      }
   }

   if (!status) {
      pipe->InfoLog = ralloc_asprintf(pipe,
                                      "Program %d is not active for all "
                                      "shaders that was linked",
                                      prog->Name);
   }

   return status;
}

extern GLboolean
_mesa_validate_program_pipeline(struct gl_context* ctx,
                                struct gl_pipeline_object *pipe,
                                GLboolean IsBound)
{
   unsigned i;

   pipe->Validated = GL_FALSE;

   /* Release and reset the info log.
    */
   if (pipe->InfoLog != NULL)
      ralloc_free(pipe->InfoLog);

   pipe->InfoLog = NULL;

   /* Section 2.11.11 (Shader Execution), subheading "Validation," of the
    * OpenGL 4.1 spec says:
    *
    *     "[INVALID_OPERATION] is generated by any command that transfers
    *     vertices to the GL if:
    *
    *         - A program object is active for at least one, but not all of
    *           the shader stages that were present when the program was
    *           linked."
    *
    * For each possible program stage, verify that the program bound to that
    * stage has all of its stages active.  In other words, if the program
    * bound to the vertex stage also has a fragment shader, the fragment
    * shader must also be bound to the fragment stage.
    */
   for (i = 0; i < MESA_SHADER_STAGES; i++) {
      if (!program_stages_all_active(pipe, pipe->CurrentProgram[i])) {
         goto err;
      }
   }

   /* Section 2.11.11 (Shader Execution), subheading "Validation," of the
    * OpenGL 4.1 spec says:
    *
    *     "[INVALID_OPERATION] is generated by any command that transfers
    *     vertices to the GL if:
    *
    *         ...
    *
    *         - One program object is active for at least two shader stages
    *           and a second program is active for a shader stage between two
    *           stages for which the first program was active."
    *
    * Without Tesselation, the only case where this can occur is the geometry
    * shader between the fragment shader and vertex shader.
    */
   if (pipe->CurrentProgram[MESA_SHADER_GEOMETRY]
       && pipe->CurrentProgram[MESA_SHADER_FRAGMENT]
       && pipe->CurrentProgram[MESA_SHADER_VERTEX]) {
      if (pipe->CurrentProgram[MESA_SHADER_VERTEX]->Name == pipe->CurrentProgram[MESA_SHADER_FRAGMENT]->Name &&
          pipe->CurrentProgram[MESA_SHADER_GEOMETRY]->Name != pipe->CurrentProgram[MESA_SHADER_VERTEX]->Name) {
         pipe->InfoLog =
            ralloc_asprintf(pipe,
                            "Program %d is active for geometry stage between "
                            "two stages for which another program %d is "
                            "active",
                            pipe->CurrentProgram[MESA_SHADER_GEOMETRY]->Name,
                            pipe->CurrentProgram[MESA_SHADER_VERTEX]->Name);
         goto err;
      }
   }

   /* Section 2.11.11 (Shader Execution), subheading "Validation," of the
    * OpenGL 4.1 spec says:
    *
    *     "[INVALID_OPERATION] is generated by any command that transfers
    *     vertices to the GL if:
    *
    *         ...
    *
    *         - There is an active program for tessellation control,
    *           tessellation evaluation, or geometry stages with corresponding
    *           executable shader, but there is no active program with
    *           executable vertex shader."
    */
   if (!pipe->CurrentProgram[MESA_SHADER_VERTEX]
       && pipe->CurrentProgram[MESA_SHADER_GEOMETRY]) {
      pipe->InfoLog = ralloc_strdup(pipe, "Program lacks a vertex shader");
      goto err;
   }

   /* Section 2.11.11 (Shader Execution), subheading "Validation," of the
    * OpenGL 4.1 spec says:
    *
    *     "[INVALID_OPERATION] is generated by any command that transfers
    *     vertices to the GL if:
    *
    *         ...
    *
    *         - There is no current program object specified by UseProgram,
    *           there is a current program pipeline object, and the current
    *           program for any shader stage has been relinked since being
    *           applied to the pipeline object via UseProgramStages with the
    *           PROGRAM_SEPARABLE parameter set to FALSE.
    */
   for (i = 0; i < MESA_SHADER_STAGES; i++) {
      if (pipe->CurrentProgram[i] && !pipe->CurrentProgram[i]->SeparateShader) {
         pipe->InfoLog = ralloc_asprintf(pipe,
                                         "Program %d was relinked without "
                                         "PROGRAM_SEPARABLE state",
                                         pipe->CurrentProgram[i]->Name);
         goto err;
      }
   }

   /* Section 2.11.11 (Shader Execution), subheading "Validation," of the
    * OpenGL 4.1 spec says:
    *
    *     "[INVALID_OPERATION] is generated by any command that transfers
    *     vertices to the GL if:
    *
    *         ...
    *
    *         - Any two active samplers in the current program object are of
    *           different types, but refer to the same texture image unit.
    *
    *         - The number of active samplers in the program exceeds the
    *           maximum number of texture image units allowed."
    */
   if (!_mesa_sampler_uniforms_pipeline_are_valid(pipe))
      goto err;

   pipe->Validated = GL_TRUE;
   return GL_TRUE;

err:
   if (IsBound)
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glValidateProgramPipeline failed to validate the pipeline");

   return GL_FALSE;
}

/**
 * Check compatibility of pipeline's program
 */
void GLAPIENTRY
_mesa_ValidateProgramPipeline(GLuint pipeline)
{
   GET_CURRENT_CONTEXT(ctx);

   struct gl_pipeline_object *pipe = lookup_pipeline_object(ctx, pipeline);

   if (!pipe) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glValidateProgramPipeline(pipeline)");
      return;
   }

   _mesa_validate_program_pipeline(ctx, pipe,
                                   (ctx->_Shader->Name == pipe->Name));
}

void GLAPIENTRY
_mesa_GetProgramPipelineInfoLog(GLuint pipeline, GLsizei bufSize,
                                GLsizei *length, GLchar *infoLog)
{
   GET_CURRENT_CONTEXT(ctx);

   struct gl_pipeline_object *pipe = lookup_pipeline_object(ctx, pipeline);

   if (!pipe) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glGetProgramPipelineInfoLog(pipeline)");
      return;
   }

   if (bufSize < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glGetProgramPipelineInfoLog(bufSize)");
      return;
   }

   if (pipe->InfoLog)
      _mesa_copy_string(infoLog, bufSize, length, pipe->InfoLog);
   else
      *length = 0;
}