summaryrefslogtreecommitdiffstats
path: root/gfx/angle/checkout/src/libANGLE/VertexArray.cpp
blob: 2a9bcd7cc0ed1b451ac695fe376b1d04bc8e453d (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
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
//
// Copyright 2013 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Implementation of the state class for mananging GLES 3 Vertex Array Objects.
//

#include "libANGLE/VertexArray.h"

#include "common/utilities.h"
#include "libANGLE/Buffer.h"
#include "libANGLE/Context.h"
#include "libANGLE/renderer/BufferImpl.h"
#include "libANGLE/renderer/GLImplFactory.h"
#include "libANGLE/renderer/VertexArrayImpl.h"

namespace gl
{
namespace
{
constexpr size_t kMaxObserverCountToTriggerUnobserve = 20;

bool IsElementArrayBufferSubjectIndex(angle::SubjectIndex subjectIndex)
{
    return (subjectIndex == kElementArrayBufferIndex);
}
}  // namespace

// VertexArrayState implementation.
VertexArrayState::VertexArrayState(VertexArray *vertexArray,
                                   size_t maxAttribs,
                                   size_t maxAttribBindings)
    : mElementArrayBuffer(vertexArray, kElementArrayBufferIndex)
{
    ASSERT(maxAttribs <= maxAttribBindings);

    for (size_t i = 0; i < maxAttribs; i++)
    {
        mVertexAttributes.emplace_back(static_cast<GLuint>(i));
        mVertexBindings.emplace_back(static_cast<GLuint>(i));
    }

    // Initially all attributes start as "client" with no buffer bound.
    mClientMemoryAttribsMask.set();
}

VertexArrayState::~VertexArrayState() {}

bool VertexArrayState::hasEnabledNullPointerClientArray() const
{
    return (mNullPointerClientMemoryAttribsMask & mEnabledAttributesMask).any();
}

AttributesMask VertexArrayState::getBindingToAttributesMask(GLuint bindingIndex) const
{
    ASSERT(bindingIndex < mVertexBindings.size());
    return mVertexBindings[bindingIndex].getBoundAttributesMask();
}

// Set an attribute using a new binding.
void VertexArrayState::setAttribBinding(const Context *context,
                                        size_t attribIndex,
                                        GLuint newBindingIndex)
{
    ASSERT(attribIndex < mVertexAttributes.size() && newBindingIndex < mVertexBindings.size());

    VertexAttribute &attrib = mVertexAttributes[attribIndex];

    // Update the binding-attribute map.
    const GLuint oldBindingIndex = attrib.bindingIndex;
    ASSERT(oldBindingIndex != newBindingIndex);

    VertexBinding &oldBinding = mVertexBindings[oldBindingIndex];
    VertexBinding &newBinding = mVertexBindings[newBindingIndex];

    ASSERT(oldBinding.getBoundAttributesMask().test(attribIndex) &&
           !newBinding.getBoundAttributesMask().test(attribIndex));

    oldBinding.resetBoundAttribute(attribIndex);
    newBinding.setBoundAttribute(attribIndex);

    // Set the attribute using the new binding.
    attrib.bindingIndex = newBindingIndex;

    if (context->isBufferAccessValidationEnabled())
    {
        attrib.updateCachedElementLimit(newBinding);
    }

    bool isMapped = newBinding.getBuffer().get() && newBinding.getBuffer()->isMapped();
    mCachedMappedArrayBuffers.set(attribIndex, isMapped);
    mEnabledAttributesMask.set(attribIndex, attrib.enabled);
    updateCachedMutableOrNonPersistentArrayBuffers(attribIndex);
    mCachedInvalidMappedArrayBuffer = mCachedMappedArrayBuffers & mEnabledAttributesMask &
                                      mCachedMutableOrImpersistentArrayBuffers;
}

void VertexArrayState::updateCachedMutableOrNonPersistentArrayBuffers(size_t index)
{
    const VertexBinding &vertexBinding   = mVertexBindings[index];
    const BindingPointer<Buffer> &buffer = vertexBinding.getBuffer();
    bool isMutableOrImpersistentArrayBuffer =
        buffer.get() &&
        (!buffer->isImmutable() || (buffer->getAccessFlags() & GL_MAP_PERSISTENT_BIT_EXT) == 0);
    mCachedMutableOrImpersistentArrayBuffers.set(index, isMutableOrImpersistentArrayBuffer);
}

// VertexArray implementation.
VertexArray::VertexArray(rx::GLImplFactory *factory,
                         VertexArrayID id,
                         size_t maxAttribs,
                         size_t maxAttribBindings)
    : mId(id),
      mState(this, maxAttribs, maxAttribBindings),
      mVertexArray(factory->createVertexArray(mState)),
      mBufferAccessValidationEnabled(false),
      mContentsObservers(this)
{
    for (size_t attribIndex = 0; attribIndex < maxAttribBindings; ++attribIndex)
    {
        mArrayBufferObserverBindings.emplace_back(this, attribIndex);
    }

    mVertexArray->setContentsObservers(&mContentsObservers);
}

void VertexArray::onDestroy(const Context *context)
{
    bool isBound = context->isCurrentVertexArray(this);
    for (uint32_t bindingIndex = 0; bindingIndex < mState.mVertexBindings.size(); ++bindingIndex)
    {
        VertexBinding &binding = mState.mVertexBindings[bindingIndex];
        Buffer *buffer         = binding.getBuffer().get();
        if (isBound)
        {
            if (buffer)
            {
                buffer->onNonTFBindingChanged(-1);
            }
        }
        if (buffer)
        {
            // Note: the non-contents observer is unbound in the ObserverBinding destructor.
            buffer->removeContentsObserver(this, bindingIndex);
        }
        binding.setBuffer(context, nullptr);
    }
    if (mState.mElementArrayBuffer.get())
    {
        if (isBound)
        {
            mState.mElementArrayBuffer->onNonTFBindingChanged(-1);
        }
        mState.mElementArrayBuffer->removeContentsObserver(this, kElementArrayBufferIndex);
    }
    mState.mElementArrayBuffer.bind(context, nullptr);

    // If mDirtyObserverBindingBits is set, it means we have removed it from the buffer's observer
    // list. We should unassign subject to avoid assertion.
    for (size_t bindingIndex : mDirtyObserverBindingBits)
    {
        angle::ObserverBinding *observer = &mArrayBufferObserverBindings[bindingIndex];
        observer->assignSubject(nullptr);
    }

    mVertexArray->destroy(context);
    SafeDelete(mVertexArray);
    delete this;
}

VertexArray::~VertexArray()
{
    ASSERT(!mVertexArray);
}

angle::Result VertexArray::setLabel(const Context *context, const std::string &label)
{
    mState.mLabel = label;

    if (mVertexArray)
    {
        return mVertexArray->onLabelUpdate(context);
    }
    return angle::Result::Continue;
}

const std::string &VertexArray::getLabel() const
{
    return mState.mLabel;
}

bool VertexArray::detachBuffer(const Context *context, BufferID bufferID)
{
    bool isBound           = context->isCurrentVertexArray(this);
    bool anyBufferDetached = false;
    for (uint32_t bindingIndex = 0; bindingIndex < mState.mVertexBindings.size(); ++bindingIndex)
    {
        VertexBinding &binding                      = mState.mVertexBindings[bindingIndex];
        const BindingPointer<Buffer> &bufferBinding = binding.getBuffer();
        if (bufferBinding.id() == bufferID)
        {
            if (isBound)
            {
                if (bufferBinding.get())
                    bufferBinding->onNonTFBindingChanged(-1);
            }
            bufferBinding->removeContentsObserver(this, bindingIndex);
            binding.setBuffer(context, nullptr);
            mArrayBufferObserverBindings[bindingIndex].reset();

            if (context->getClientVersion() >= ES_3_1)
            {
                setDirtyBindingBit(bindingIndex, DIRTY_BINDING_BUFFER);
            }
            else
            {
                static_assert(gl::MAX_VERTEX_ATTRIB_BINDINGS < 8 * sizeof(uint32_t),
                              "Not enough bits in bindingIndex");
                // The redundant uint32_t cast here is required to avoid a warning on MSVC.
                ASSERT(binding.getBoundAttributesMask() ==
                       AttributesMask(static_cast<uint32_t>(1 << bindingIndex)));
                setDirtyAttribBit(bindingIndex, DIRTY_ATTRIB_POINTER);
            }

            anyBufferDetached = true;
            mState.mClientMemoryAttribsMask |= binding.getBoundAttributesMask();
        }
    }

    if (mState.mElementArrayBuffer.get() && mState.mElementArrayBuffer->id() == bufferID)
    {
        if (isBound && mState.mElementArrayBuffer.get())
            mState.mElementArrayBuffer->onNonTFBindingChanged(-1);
        mState.mElementArrayBuffer->removeContentsObserver(this, kElementArrayBufferIndex);
        mState.mElementArrayBuffer.bind(context, nullptr);
        mDirtyBits.set(DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
        anyBufferDetached = true;
    }

    return anyBufferDetached;
}

const VertexAttribute &VertexArray::getVertexAttribute(size_t attribIndex) const
{
    ASSERT(attribIndex < getMaxAttribs());
    return mState.mVertexAttributes[attribIndex];
}

const VertexBinding &VertexArray::getVertexBinding(size_t bindingIndex) const
{
    ASSERT(bindingIndex < getMaxBindings());
    return mState.mVertexBindings[bindingIndex];
}

size_t VertexArray::GetVertexIndexFromDirtyBit(size_t dirtyBit)
{
    static_assert(gl::MAX_VERTEX_ATTRIBS == gl::MAX_VERTEX_ATTRIB_BINDINGS,
                  "The stride of vertex attributes should equal to that of vertex bindings.");
    ASSERT(dirtyBit > DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
    return (dirtyBit - DIRTY_BIT_ATTRIB_0) % gl::MAX_VERTEX_ATTRIBS;
}

ANGLE_INLINE void VertexArray::setDirtyAttribBit(size_t attribIndex,
                                                 DirtyAttribBitType dirtyAttribBit)
{
    mDirtyBits.set(DIRTY_BIT_ATTRIB_0 + attribIndex);
    mDirtyAttribBits[attribIndex].set(dirtyAttribBit);
}

ANGLE_INLINE void VertexArray::clearDirtyAttribBit(size_t attribIndex,
                                                   DirtyAttribBitType dirtyAttribBit)
{
    mDirtyAttribBits[attribIndex].set(dirtyAttribBit, false);
    if (mDirtyAttribBits[attribIndex].any())
    {
        return;
    }
    mDirtyBits.set(DIRTY_BIT_ATTRIB_0 + attribIndex, false);
}

ANGLE_INLINE void VertexArray::setDirtyBindingBit(size_t bindingIndex,
                                                  DirtyBindingBitType dirtyBindingBit)
{
    mDirtyBits.set(DIRTY_BIT_BINDING_0 + bindingIndex);
    mDirtyBindingBits[bindingIndex].set(dirtyBindingBit);
}

ANGLE_INLINE void VertexArray::updateCachedBufferBindingSize(VertexBinding *binding)
{
    if (!mBufferAccessValidationEnabled)
        return;

    for (size_t boundAttribute : binding->getBoundAttributesMask())
    {
        mState.mVertexAttributes[boundAttribute].updateCachedElementLimit(*binding);
    }
}

ANGLE_INLINE void VertexArray::updateCachedArrayBuffersMasks(
    bool isMapped,
    bool isImmutable,
    bool isPersistent,
    const AttributesMask &boundAttributesMask)
{
    if (isMapped)
    {
        mState.mCachedMappedArrayBuffers |= boundAttributesMask;
    }
    else
    {
        mState.mCachedMappedArrayBuffers &= ~boundAttributesMask;
    }

    if (!isImmutable || !isPersistent)
    {
        mState.mCachedMutableOrImpersistentArrayBuffers |= boundAttributesMask;
    }
    else
    {
        mState.mCachedMutableOrImpersistentArrayBuffers &= ~boundAttributesMask;
    }

    mState.mCachedInvalidMappedArrayBuffer = mState.mCachedMappedArrayBuffers &
                                             mState.mEnabledAttributesMask &
                                             mState.mCachedMutableOrImpersistentArrayBuffers;
}

ANGLE_INLINE void VertexArray::updateCachedMappedArrayBuffersBinding(const VertexBinding &binding)
{
    const Buffer *buffer = binding.getBuffer().get();
    bool isMapped        = buffer && buffer->isMapped();
    bool isImmutable     = buffer && buffer->isImmutable();
    bool isPersistent    = buffer && (buffer->getAccessFlags() & GL_MAP_PERSISTENT_BIT_EXT) != 0;
    return updateCachedArrayBuffersMasks(isMapped, isImmutable, isPersistent,
                                         binding.getBoundAttributesMask());
}

ANGLE_INLINE void VertexArray::updateCachedTransformFeedbackBindingValidation(size_t bindingIndex,
                                                                              const Buffer *buffer)
{
    const bool hasConflict = buffer && buffer->hasWebGLXFBBindingConflict(true);
    mCachedTransformFeedbackConflictedBindingsMask.set(bindingIndex, hasConflict);
}

bool VertexArray::bindVertexBufferImpl(const Context *context,
                                       size_t bindingIndex,
                                       Buffer *boundBuffer,
                                       GLintptr offset,
                                       GLsizei stride)
{
    ASSERT(bindingIndex < getMaxBindings());
    ASSERT(context->isCurrentVertexArray(this));

    VertexBinding *binding = &mState.mVertexBindings[bindingIndex];

    Buffer *oldBuffer = binding->getBuffer().get();

    const bool sameBuffer = oldBuffer == boundBuffer;
    const bool sameStride = static_cast<GLuint>(stride) == binding->getStride();
    const bool sameOffset = offset == binding->getOffset();

    if (sameBuffer && sameStride && sameOffset)
    {
        return false;
    }

    angle::ObserverBinding *observer = &mArrayBufferObserverBindings[bindingIndex];
    observer->assignSubject(boundBuffer);

    // Several nullptr checks are combined here for optimization purposes.
    if (oldBuffer)
    {
        oldBuffer->onNonTFBindingChanged(-1);
        oldBuffer->removeObserver(observer);
        oldBuffer->removeContentsObserver(this, static_cast<uint32_t>(bindingIndex));
        oldBuffer->release(context);
    }

    binding->assignBuffer(boundBuffer);
    binding->setOffset(offset);
    binding->setStride(stride);
    updateCachedBufferBindingSize(binding);

    // Update client memory attribute pointers. Affects all bound attributes.
    if (boundBuffer)
    {
        boundBuffer->addRef();
        boundBuffer->onNonTFBindingChanged(1);
        boundBuffer->addObserver(observer);
        if (context->isWebGL())
        {
            mCachedTransformFeedbackConflictedBindingsMask.set(
                bindingIndex, boundBuffer->hasWebGLXFBBindingConflict(true));
        }
        mState.mClientMemoryAttribsMask &= ~binding->getBoundAttributesMask();

        bool isMapped     = boundBuffer->isMapped() == GL_TRUE;
        bool isImmutable  = boundBuffer->isImmutable() == GL_TRUE;
        bool isPersistent = (boundBuffer->getAccessFlags() & GL_MAP_PERSISTENT_BIT_EXT) != 0;
        updateCachedArrayBuffersMasks(isMapped, isImmutable, isPersistent,
                                      binding->getBoundAttributesMask());
    }
    else
    {
        if (context->isWebGL())
        {
            mCachedTransformFeedbackConflictedBindingsMask.set(bindingIndex, false);
        }
        mState.mClientMemoryAttribsMask |= binding->getBoundAttributesMask();
        updateCachedArrayBuffersMasks(false, false, false, binding->getBoundAttributesMask());
    }

    return true;
}

void VertexArray::bindVertexBuffer(const Context *context,
                                   size_t bindingIndex,
                                   Buffer *boundBuffer,
                                   GLintptr offset,
                                   GLsizei stride)
{
    if (bindVertexBufferImpl(context, bindingIndex, boundBuffer, offset, stride))
    {
        setDirtyBindingBit(bindingIndex, DIRTY_BINDING_BUFFER);
    }
}

void VertexArray::setVertexAttribBinding(const Context *context,
                                         size_t attribIndex,
                                         GLuint bindingIndex)
{
    ASSERT(attribIndex < getMaxAttribs() && bindingIndex < getMaxBindings());

    if (mState.mVertexAttributes[attribIndex].bindingIndex == bindingIndex)
    {
        return;
    }

    // In ES 3.0 contexts, the binding cannot change, hence the code below is unreachable.
    ASSERT(context->getClientVersion() >= ES_3_1);

    mState.setAttribBinding(context, attribIndex, bindingIndex);

    setDirtyAttribBit(attribIndex, DIRTY_ATTRIB_BINDING);

    // Update client attribs mask.
    bool hasBuffer = mState.mVertexBindings[bindingIndex].getBuffer().get() != nullptr;
    mState.mClientMemoryAttribsMask.set(attribIndex, !hasBuffer);
}

void VertexArray::setVertexBindingDivisor(const Context *context,
                                          size_t bindingIndex,
                                          GLuint divisor)
{
    ASSERT(bindingIndex < getMaxBindings());

    VertexBinding &binding = mState.mVertexBindings[bindingIndex];

    if (binding.getDivisor() == divisor)
    {
        return;
    }

    binding.setDivisor(divisor);
    setDirtyBindingBit(bindingIndex, DIRTY_BINDING_DIVISOR);

    // Trigger updates in all bound attributes.
    if (context->isBufferAccessValidationEnabled())
    {
        for (size_t attribIndex : binding.getBoundAttributesMask())
        {
            mState.mVertexAttributes[attribIndex].updateCachedElementLimit(binding);
        }
    }
}

ANGLE_INLINE bool VertexArray::setVertexAttribFormatImpl(VertexAttribute *attrib,
                                                         GLint size,
                                                         VertexAttribType type,
                                                         bool normalized,
                                                         bool pureInteger,
                                                         GLuint relativeOffset)
{
    angle::FormatID formatID = gl::GetVertexFormatID(type, normalized, size, pureInteger);

    if (formatID != attrib->format->id || attrib->relativeOffset != relativeOffset)
    {
        attrib->relativeOffset = relativeOffset;
        attrib->format         = &angle::Format::Get(formatID);
        return true;
    }

    return false;
}

void VertexArray::setVertexAttribFormat(size_t attribIndex,
                                        GLint size,
                                        VertexAttribType type,
                                        bool normalized,
                                        bool pureInteger,
                                        GLuint relativeOffset)
{
    VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];

    ComponentType componentType = GetVertexAttributeComponentType(pureInteger, type);
    SetComponentTypeMask(componentType, attribIndex, &mState.mVertexAttributesTypeMask);

    if (setVertexAttribFormatImpl(&attrib, size, type, normalized, pureInteger, relativeOffset))
    {
        setDirtyAttribBit(attribIndex, DIRTY_ATTRIB_FORMAT);
    }

    attrib.updateCachedElementLimit(mState.mVertexBindings[attrib.bindingIndex]);
}

void VertexArray::setVertexAttribDivisor(const Context *context, size_t attribIndex, GLuint divisor)
{
    ASSERT(attribIndex < getMaxAttribs());

    setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));
    setVertexBindingDivisor(context, attribIndex, divisor);
}

void VertexArray::enableAttribute(size_t attribIndex, bool enabledState)
{
    ASSERT(attribIndex < getMaxAttribs());

    VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];

    if (mState.mEnabledAttributesMask.test(attribIndex) == enabledState)
    {
        return;
    }

    attrib.enabled = enabledState;

    // Update state cache
    mState.mEnabledAttributesMask.set(attribIndex, enabledState);
    bool enableChanged = (mState.mEnabledAttributesMask.test(attribIndex) !=
                          mState.mLastSyncedEnabledAttributesMask.test(attribIndex));

    if (enableChanged)
    {
        setDirtyAttribBit(attribIndex, DIRTY_ATTRIB_ENABLED);
    }
    else
    {
        clearDirtyAttribBit(attribIndex, DIRTY_ATTRIB_ENABLED);
    }

    mState.updateCachedMutableOrNonPersistentArrayBuffers(attribIndex);
    mState.mCachedInvalidMappedArrayBuffer = mState.mCachedMappedArrayBuffers &
                                             mState.mEnabledAttributesMask &
                                             mState.mCachedMutableOrImpersistentArrayBuffers;
}

ANGLE_INLINE void VertexArray::setVertexAttribPointerImpl(const Context *context,
                                                          ComponentType componentType,
                                                          bool pureInteger,
                                                          size_t attribIndex,
                                                          Buffer *boundBuffer,
                                                          GLint size,
                                                          VertexAttribType type,
                                                          bool normalized,
                                                          GLsizei stride,
                                                          const void *pointer)
{
    ASSERT(attribIndex < getMaxAttribs());

    VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];

    SetComponentTypeMask(componentType, attribIndex, &mState.mVertexAttributesTypeMask);

    bool attribDirty = setVertexAttribFormatImpl(&attrib, size, type, normalized, pureInteger, 0);

    if (attrib.bindingIndex != attribIndex)
    {
        setVertexAttribBinding(context, attribIndex, static_cast<GLuint>(attribIndex));
    }

    GLsizei effectiveStride =
        stride == 0 ? static_cast<GLsizei>(ComputeVertexAttributeTypeSize(attrib)) : stride;

    if (attrib.vertexAttribArrayStride != static_cast<GLuint>(stride))
    {
        attribDirty = true;
    }
    attrib.vertexAttribArrayStride = stride;

    // If we switch from an array buffer to a client pointer(or vice-versa), we set the whole
    // attribute dirty. This notifies the Vulkan back-end to update all its caches.
    const VertexBinding &binding = mState.mVertexBindings[attribIndex];
    if ((boundBuffer == nullptr) != (binding.getBuffer().get() == nullptr))
    {
        attribDirty = true;
    }

    // Change of attrib.pointer is not part of attribDirty. Pointer is actually the buffer offset
    // which is handled within bindVertexBufferImpl and reflected in bufferDirty.
    attrib.pointer  = pointer;
    GLintptr offset = boundBuffer ? reinterpret_cast<GLintptr>(pointer) : 0;
    const bool bufferDirty =
        bindVertexBufferImpl(context, attribIndex, boundBuffer, offset, effectiveStride);

    if (attribDirty)
    {
        setDirtyAttribBit(attribIndex, DIRTY_ATTRIB_POINTER);
    }
    else if (bufferDirty)
    {
        setDirtyAttribBit(attribIndex, DIRTY_ATTRIB_POINTER_BUFFER);
    }

    mState.mNullPointerClientMemoryAttribsMask.set(attribIndex,
                                                   boundBuffer == nullptr && pointer == nullptr);
}

void VertexArray::setVertexAttribPointer(const Context *context,
                                         size_t attribIndex,
                                         gl::Buffer *boundBuffer,
                                         GLint size,
                                         VertexAttribType type,
                                         bool normalized,
                                         GLsizei stride,
                                         const void *pointer)
{
    setVertexAttribPointerImpl(context, ComponentType::Float, false, attribIndex, boundBuffer, size,
                               type, normalized, stride, pointer);
}

void VertexArray::setVertexAttribIPointer(const Context *context,
                                          size_t attribIndex,
                                          gl::Buffer *boundBuffer,
                                          GLint size,
                                          VertexAttribType type,
                                          GLsizei stride,
                                          const void *pointer)
{
    ComponentType componentType = GetVertexAttributeComponentType(true, type);
    setVertexAttribPointerImpl(context, componentType, true, attribIndex, boundBuffer, size, type,
                               false, stride, pointer);
}

angle::Result VertexArray::syncState(const Context *context)
{
    if (mDirtyBits.any())
    {
        mDirtyBitsGuard = mDirtyBits;
        ANGLE_TRY(
            mVertexArray->syncState(context, mDirtyBits, &mDirtyAttribBits, &mDirtyBindingBits));
        mDirtyBits.reset();
        mDirtyBitsGuard.reset();

        // The dirty bits should be reset in the back-end. To simplify ASSERTs only check attrib 0.
        ASSERT(mDirtyAttribBits[0].none());
        ASSERT(mDirtyBindingBits[0].none());
        mState.mLastSyncedEnabledAttributesMask = mState.mEnabledAttributesMask;
    }
    return angle::Result::Continue;
}

// This becomes current vertex array on the context
void VertexArray::onBind(const Context *context)
{
    if (mDirtyObserverBindingBits.none())
    {
        return;
    }

    // This vertex array becoming current. Some of the bindings we may have removed from buffer's
    // observer list. We need to add it back to the buffer's observer list and update dirty bits
    // that we may have missed while we were not observing.
    for (size_t bindingIndex : mDirtyObserverBindingBits)
    {
        const gl::VertexBinding &binding = mState.getVertexBindings()[bindingIndex];
        gl::Buffer *bufferGL             = binding.getBuffer().get();
        ASSERT(bufferGL != nullptr);

        bufferGL->addObserver(&mArrayBufferObserverBindings[bindingIndex]);
        updateCachedMappedArrayBuffersBinding(mState.mVertexBindings[bindingIndex]);

        // Assume both data and internal storage has been dirtied.
        mDirtyBits.set(DIRTY_BIT_BINDING_0 + bindingIndex);

        if (mBufferAccessValidationEnabled)
        {
            for (size_t boundAttribute :
                 mState.mVertexBindings[bindingIndex].getBoundAttributesMask())
            {
                mState.mVertexAttributes[boundAttribute].updateCachedElementLimit(
                    mState.mVertexBindings[bindingIndex]);
            }
        }

        if (context->isWebGL())
        {
            updateCachedTransformFeedbackBindingValidation(bindingIndex, bufferGL);
        }
    }
    mDirtyObserverBindingBits.reset();

    onStateChange(angle::SubjectMessage::ContentsChanged);
}

// This becomes non-current vertex array on the context
void VertexArray::onUnbind(const Context *context)
{
    // This vertex array becoming non-current. For performance reason, if there are too many
    // observers in the buffer, we remove it from the buffers' observer list so that the cost of
    // buffer sending signal to observers will be too expensive.
    for (uint32_t bindingIndex = 0; bindingIndex < mArrayBufferObserverBindings.size();
         ++bindingIndex)
    {
        const gl::VertexBinding &binding = mState.getVertexBindings()[bindingIndex];
        gl::Buffer *bufferGL             = binding.getBuffer().get();
        if (bufferGL && bufferGL->getObserversCount() > kMaxObserverCountToTriggerUnobserve)
        {
            bufferGL->removeObserver(&mArrayBufferObserverBindings[bindingIndex]);
            mDirtyObserverBindingBits.set(bindingIndex);
        }
    }
}

void VertexArray::onBindingChanged(const Context *context, int incr)
{
    // When vertex array gets unbound, we remove it from bound buffers' observer list so that when
    // buffer changes, it wont has to loop over all these non-current vertex arrays and set dirty
    // bit on them. To compensate for that, when we bind a vertex array, we have to check against
    // each bound buffers and see if they have changed and needs to update vertex array's dirty bits
    // accordingly
    ASSERT(incr == 1 || incr == -1);
    if (incr < 0)
    {
        onUnbind(context);
    }
    else
    {
        onBind(context);
    }

    if (context->isWebGL())
    {
        if (mState.mElementArrayBuffer.get())
            mState.mElementArrayBuffer->onNonTFBindingChanged(incr);
        for (auto &binding : mState.mVertexBindings)
        {
            binding.onContainerBindingChanged(context, incr);
        }
    }
}

VertexArray::DirtyBitType VertexArray::getDirtyBitFromIndex(bool contentsChanged,
                                                            angle::SubjectIndex index) const
{
    if (IsElementArrayBufferSubjectIndex(index))
    {
        mIndexRangeCache.invalidate();
        return contentsChanged ? DIRTY_BIT_ELEMENT_ARRAY_BUFFER_DATA
                               : DIRTY_BIT_ELEMENT_ARRAY_BUFFER;
    }
    else
    {
        // Note: this currently just gets the top-level dirty bit.
        ASSERT(index < mArrayBufferObserverBindings.size());
        return static_cast<DirtyBitType>(
            (contentsChanged ? DIRTY_BIT_BUFFER_DATA_0 : DIRTY_BIT_BINDING_0) + index);
    }
}

void VertexArray::onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message)
{
    switch (message)
    {
        case angle::SubjectMessage::SubjectChanged:
            if (!IsElementArrayBufferSubjectIndex(index))
            {
                updateCachedBufferBindingSize(&mState.mVertexBindings[index]);
            }
            setDependentDirtyBit(false, index);
            break;

        case angle::SubjectMessage::BindingChanged:
            if (!IsElementArrayBufferSubjectIndex(index))
            {
                const Buffer *buffer = mState.mVertexBindings[index].getBuffer().get();
                updateCachedTransformFeedbackBindingValidation(index, buffer);
            }
            break;

        case angle::SubjectMessage::SubjectMapped:
            if (!IsElementArrayBufferSubjectIndex(index))
            {
                updateCachedMappedArrayBuffersBinding(mState.mVertexBindings[index]);
            }
            onStateChange(angle::SubjectMessage::SubjectMapped);
            break;

        case angle::SubjectMessage::SubjectUnmapped:
            setDependentDirtyBit(true, index);

            if (!IsElementArrayBufferSubjectIndex(index))
            {
                updateCachedMappedArrayBuffersBinding(mState.mVertexBindings[index]);
            }
            onStateChange(angle::SubjectMessage::SubjectUnmapped);
            break;

        case angle::SubjectMessage::InternalMemoryAllocationChanged:
            setDependentDirtyBit(false, index);
            break;

        default:
            UNREACHABLE();
            break;
    }
}

void VertexArray::setDependentDirtyBit(bool contentsChanged, angle::SubjectIndex index)
{
    DirtyBitType dirtyBit = getDirtyBitFromIndex(contentsChanged, index);
    ASSERT(!mDirtyBitsGuard.valid() || mDirtyBitsGuard.value().test(dirtyBit));
    mDirtyBits.set(dirtyBit);
    onStateChange(angle::SubjectMessage::ContentsChanged);
}

bool VertexArray::hasTransformFeedbackBindingConflict(const gl::Context *context) const
{
    // Fast check first.
    if (!mCachedTransformFeedbackConflictedBindingsMask.any())
    {
        return false;
    }

    const AttributesMask &activeAttribues = context->getStateCache().getActiveBufferedAttribsMask();

    // Slow check. We must ensure that the conflicting attributes are enabled/active.
    for (size_t attribIndex : activeAttribues)
    {
        const VertexAttribute &attrib = mState.mVertexAttributes[attribIndex];
        if (mCachedTransformFeedbackConflictedBindingsMask[attrib.bindingIndex])
        {
            return true;
        }
    }

    return false;
}

angle::Result VertexArray::getIndexRangeImpl(const Context *context,
                                             DrawElementsType type,
                                             GLsizei indexCount,
                                             const void *indices,
                                             IndexRange *indexRangeOut) const
{
    Buffer *elementArrayBuffer = mState.mElementArrayBuffer.get();
    if (!elementArrayBuffer)
    {
        *indexRangeOut = ComputeIndexRange(type, indices, indexCount,
                                           context->getState().isPrimitiveRestartEnabled());
        return angle::Result::Continue;
    }

    size_t offset = reinterpret_cast<uintptr_t>(indices);
    ANGLE_TRY(elementArrayBuffer->getIndexRange(context, type, offset, indexCount,
                                                context->getState().isPrimitiveRestartEnabled(),
                                                indexRangeOut));

    mIndexRangeCache.put(type, indexCount, offset, *indexRangeOut);
    return angle::Result::Continue;
}

VertexArray::IndexRangeCache::IndexRangeCache() = default;

void VertexArray::IndexRangeCache::put(DrawElementsType type,
                                       GLsizei indexCount,
                                       size_t offset,
                                       const IndexRange &indexRange)
{
    ASSERT(type != DrawElementsType::InvalidEnum);

    mTypeKey       = type;
    mIndexCountKey = indexCount;
    mOffsetKey     = offset;
    mPayload       = indexRange;
}

void VertexArray::onBufferContentsChange(uint32_t bufferIndex)
{
    setDependentDirtyBit(true, bufferIndex);
}

VertexArrayBufferContentsObservers::VertexArrayBufferContentsObservers(VertexArray *vertexArray)
    : mVertexArray(vertexArray)
{}

void VertexArrayBufferContentsObservers::enableForBuffer(Buffer *buffer, uint32_t bufferIndex)
{
    buffer->addContentsObserver(mVertexArray, bufferIndex);
}

void VertexArrayBufferContentsObservers::disableForBuffer(Buffer *buffer, uint32_t bufferIndex)
{
    buffer->removeContentsObserver(mVertexArray, bufferIndex);
}
}  // namespace gl