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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 "GrRenderTarget.h"
#include "GrSurfaceProxy.h"
#include "GrTypes.h"
class GrTextureProvider;
// 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 : public GrSurfaceProxy {
public:
/**
* The caller gets the creation ref.
*/
static sk_sp<GrRenderTargetProxy> Make(const GrCaps&, const GrSurfaceDesc&,
SkBackingFit, SkBudgeted);
static sk_sp<GrRenderTargetProxy> Make(sk_sp<GrRenderTarget> rt);
~GrRenderTargetProxy() override;
// TODO: add asTextureProxy variants
GrRenderTargetProxy* asRenderTargetProxy() override { return this; }
const GrRenderTargetProxy* asRenderTargetProxy() const override { return this; }
// Actually instantiate the backing rendertarget, if necessary.
GrRenderTarget* instantiate(GrTextureProvider* texProvider);
/**
* @return true if the surface is multisampled in all buffers,
* false otherwise
*/
bool isUnifiedMultisampled() const {
if (fSampleConfig != GrRenderTarget::kUnified_SampleConfig) {
return false;
}
return 0 != fDesc.fSampleCnt;
}
/**
* @return true if the surface is multisampled in the stencil buffer,
* false otherwise
*/
bool isStencilBufferMultisampled() const {
return 0 != fDesc.fSampleCnt;
}
/**
* @return the number of color samples-per-pixel, or zero if non-MSAA or
* multisampled in the stencil buffer only.
*/
int numColorSamples() const {
if (fSampleConfig == GrRenderTarget::kUnified_SampleConfig) {
return fDesc.fSampleCnt;
}
return 0;
}
/**
* @return the number of stencil samples-per-pixel, or zero if non-MSAA.
*/
int numStencilSamples() const {
return fDesc.fSampleCnt;
}
/**
* @return true if the surface is mixed sampled, false otherwise.
*/
bool hasMixedSamples() const {
SkASSERT(GrRenderTarget::kStencil_SampleConfig != fSampleConfig ||
this->isStencilBufferMultisampled());
return GrRenderTarget::kStencil_SampleConfig == fSampleConfig;
}
void setLastDrawTarget(GrDrawTarget* dt);
GrDrawTarget* getLastDrawTarget() { return fLastDrawTarget; }
private:
// TODO: we can probably munge the 'desc' in both the wrapped and deferred
// cases to make the sampleConfig/numSamples stuff more rational.
GrRenderTargetProxy(const GrCaps& caps, const GrSurfaceDesc& desc,
SkBackingFit fit, SkBudgeted budgeted)
: INHERITED(desc, fit, budgeted)
, fTarget(nullptr)
, fSampleConfig(GrRenderTarget::ComputeSampleConfig(caps, desc.fSampleCnt))
, fLastDrawTarget(nullptr) {
}
// Wrapped version
GrRenderTargetProxy(sk_sp<GrRenderTarget> rt);
// For wrapped render targets we store it here.
// For deferred proxies we will fill this in when we need to instantiate the deferred resource
sk_sp<GrRenderTarget> fTarget;
// The sample config doesn't usually get computed until the render target is instantiated but
// the render target proxy may need to answer queries about it before then. For this reason
// we precompute it in the deferred case. In the wrapped case we just copy the wrapped
// rendertarget's info here.
GrRenderTarget::SampleConfig fSampleConfig;
// The last drawTarget that wrote to or is currently going to write to this renderTarget
// The drawTarget can be closed (e.g., no draw context is currently bound
// to this renderTarget).
// This back-pointer is required so that we can add a dependancy between
// the drawTarget used to create the current contents of this renderTarget
// and the drawTarget of a destination renderTarget to which this one is being drawn.
GrDrawTarget* fLastDrawTarget;
typedef GrSurfaceProxy INHERITED;
};
#endif
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