1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8
9#include "src/gpu/GrRenderTarget.h"
10
11#include "src/core/SkRectPriv.h"
12#include "src/gpu/GrGpu.h"
13#include "src/gpu/GrRenderTargetContext.h"
14#include "src/gpu/GrSamplePatternDictionary.h"
15#include "src/gpu/GrStencilAttachment.h"
16#include "src/gpu/GrStencilSettings.h"
17
18GrRenderTarget::GrRenderTarget(GrGpu* gpu,
19 const SkISize& dimensions,
20 int sampleCount,
21 GrProtected isProtected,
22 GrStencilAttachment* stencil)
23 : INHERITED(gpu, dimensions, isProtected)
24 , fStencilAttachment(stencil)
25 , fSampleCnt(sampleCount)
26 , fSamplePatternKey(GrSamplePatternDictionary::kInvalidSamplePatternKey) {}
27
28GrRenderTarget::~GrRenderTarget() = default;
29
30void GrRenderTarget::onRelease() {
31 fStencilAttachment = nullptr;
32
33 INHERITED::onRelease();
34}
35
36void GrRenderTarget::onAbandon() {
37 fStencilAttachment = nullptr;
38
39 INHERITED::onAbandon();
40}
41
42void GrRenderTarget::attachStencilAttachment(sk_sp<GrStencilAttachment> stencil) {
43#ifdef SK_DEBUG
44 if (fSampleCnt == 1) {
45 // TODO: We don't expect a mixed sampled render target to ever change its stencil buffer
46 // right now. But if it does swap in a stencil buffer with a different number of samples,
47 // and if we have a valid fSamplePatternKey, we will need to invalidate fSamplePatternKey
48 // here and add tests to make sure we it properly.
49 SkASSERT(GrSamplePatternDictionary::kInvalidSamplePatternKey == fSamplePatternKey);
50 } else {
51 // Render targets with >1 color sample should never use mixed samples. (This would lead to
52 // different sample patterns, depending on stencil state.)
53 SkASSERT(!stencil || stencil->numSamples() == fSampleCnt);
54 }
55#endif
56
57 if (!stencil && !fStencilAttachment) {
58 // No need to do any work since we currently don't have a stencil attachment and
59 // we're not actually adding one.
60 return;
61 }
62
63 fStencilAttachment = std::move(stencil);
64 if (!this->completeStencilAttachment()) {
65 fStencilAttachment = nullptr;
66 }
67}
68
69int GrRenderTarget::numStencilBits() const {
70 SkASSERT(this->getStencilAttachment());
71 return this->getStencilAttachment()->bits();
72}
73
74int GrRenderTarget::getSamplePatternKey() {
75#ifdef SK_DEBUG
76 if (fSampleCnt <= 1) {
77 // If the color buffer is not multisampled, the sample pattern better come from the stencil
78 // buffer (mixed samples).
79 SkASSERT(fStencilAttachment && fStencilAttachment->numSamples() > 1);
80 } else {
81 // The color sample count and stencil count cannot both be unequal and both greater than
82 // one. If this were the case, there would be more than one sample pattern associated with
83 // the render target.
84 SkASSERT(!fStencilAttachment || fStencilAttachment->numSamples() == fSampleCnt);
85 }
86#endif
87 if (GrSamplePatternDictionary::kInvalidSamplePatternKey == fSamplePatternKey) {
88 fSamplePatternKey = this->getGpu()->findOrAssignSamplePatternKey(this);
89 }
90 SkASSERT(fSamplePatternKey != GrSamplePatternDictionary::kInvalidSamplePatternKey);
91 return fSamplePatternKey;
92}
93
94const SkTArray<SkPoint>& GrRenderTarget::getSampleLocations() {
95 int samplePatternKey = this->getSamplePatternKey();
96 return this->getGpu()->retrieveSampleLocations(samplePatternKey);
97}
98