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* Copyright 2016 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrRenderTargetProxy_DEFINED
#define GrRenderTargetProxy_DEFINED
#include "include/private/GrTypesPriv.h"
#include "src/core/SkArenaAlloc.h"
#include "src/gpu/GrCaps.h"
#include "src/gpu/GrNativeRect.h"
#include "src/gpu/GrSurfaceProxy.h"
#include "src/gpu/GrSwizzle.h"
class GrResourceProvider;
class GrArenas : public SkNVRefCnt<GrArenas> {
SkArenaAlloc* arenaAlloc() { return &fArenaAlloc; }
SkArenaAlloc fArenaAlloc{1024};
// This class delays the acquisition of RenderTargets until they are actually
// required
// Beware: the uniqueID of the RenderTargetProxy will usually be different than
// the uniqueID of the RenderTarget it represents!
class GrRenderTargetProxy : virtual public GrSurfaceProxy {
GrRenderTargetProxy* asRenderTargetProxy() override { return this; }
const GrRenderTargetProxy* asRenderTargetProxy() const override { return this; }
// Actually instantiate the backing rendertarget, if necessary.
bool instantiate(GrResourceProvider*) override;
bool canUseMixedSamples(const GrCaps& caps) const {
return caps.mixedSamplesSupport() && !this->glRTFBOIDIs0() &&
caps.internalMultisampleCount(this->backendFormat()) > 1 &&
* Indicate that a draw to this proxy requires stencil, and how many stencil samples it needs.
* The number of stencil samples on this proxy will be equal to the largest sample count passed
* to this method.
void setNeedsStencil(int8_t numStencilSamples) {
SkASSERT(numStencilSamples >= fSampleCnt);
fNumStencilSamples = std::max(numStencilSamples, fNumStencilSamples);
* Returns the number of stencil samples this proxy will use, or 0 if it does not use stencil.
int numStencilSamples() const { return fNumStencilSamples; }
* Returns the number of samples/pixel in the color buffer (One if non-MSAA).
int numSamples() const { return fSampleCnt; }
int maxWindowRectangles(const GrCaps& caps) const;
bool glRTFBOIDIs0() const { return fSurfaceFlags & GrInternalSurfaceFlags::kGLRTFBOIDIs0; }
bool wrapsVkSecondaryCB() const { return fWrapsVkSecondaryCB == WrapsVkSecondaryCB::kYes; }
bool supportsVkInputAttachment() const {
return fSurfaceFlags & GrInternalSurfaceFlags::kVkRTSupportsInputAttachment;
void markMSAADirty(SkIRect dirtyRect) {
void markMSAAResolved() {
bool isMSAADirty() const {
SkASSERT(fMSAADirtyRect.isEmpty() || this->requiresManualMSAAResolve());
return this->requiresManualMSAAResolve() && !fMSAADirtyRect.isEmpty();
const SkIRect& msaaDirtyRect() const {
return fMSAADirtyRect;
// TODO: move this to a priv class!
bool refsWrappedObjects() const;
sk_sp<GrArenas> arenas() {
if (fArenas == nullptr) {
fArenas = sk_make_sp<GrArenas>();
return fArenas;
void clearArenas() {
fArenas = nullptr;
friend class GrProxyProvider; // for ctors
friend class GrRenderTargetProxyPriv;
// Deferred version
GrRenderTargetProxy(const GrCaps&,
const GrBackendFormat&,
int sampleCount,
enum class WrapsVkSecondaryCB : bool { kNo = false, kYes = true };
// Lazy-callback version
// There are two main use cases for lazily-instantiated proxies:
// basic knowledge - width, height, config, samples, origin are known
// minimal knowledge - only config is known.
// The basic knowledge version is used for DDL where we know the type of proxy we are going to
// use, but we don't have access to the GPU yet to instantiate it.
// The minimal knowledge version is used for CCPR where we are generating an atlas but we do not
// know the final size until flush time.
const GrBackendFormat&,
int sampleCount,
// Wrapped version
WrapsVkSecondaryCB = WrapsVkSecondaryCB::kNo);
sk_sp<GrSurface> createSurface(GrResourceProvider*) const override;
bool canChangeStencilAttachment() const;
size_t onUninstantiatedGpuMemorySize() const override;
SkDEBUGCODE(void onValidateSurface(const GrSurface*) override;)
LazySurfaceDesc callbackDesc() const override;
// WARNING: Be careful when adding or removing fields here. ASAN is likely to trigger warnings
// when instantiating GrTextureRenderTargetProxy. The std::function in GrSurfaceProxy makes
// each class in the diamond require 16 byte alignment. Clang appears to layout the fields for
// each class to achieve the necessary alignment. However, ASAN checks the alignment of 'this'
// in the constructors, and always looks for the full 16 byte alignment, even if the fields in
// that particular class don't require it. Changing the size of this object can move the start
// address of other types, leading to this problem.
int8_t fSampleCnt;
int8_t fNumStencilSamples = 0;
WrapsVkSecondaryCB fWrapsVkSecondaryCB;
SkIRect fMSAADirtyRect = SkIRect::MakeEmpty();
sk_sp<GrArenas> fArenas{nullptr};
// This is to fix issue in large comment above. Without the padding we can end up with the
// GrTextureProxy starting 8 byte aligned by not 16. This happens when the RT ends at bytes 1-8.
// Note: with the virtual inheritance an 8 byte pointer is at the start of GrRenderTargetProxy.
// In the current world we end the RT proxy at 12 bytes. Technically any padding between 0-4
// will work, but we use 4 to be more explicit about getting it to 16 byte alignment.
char fDummyPadding[4];
using INHERITED = GrSurfaceProxy;