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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 "GrRenderTargetPriv.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(const GrCaps&, sk_sp<GrRenderTarget>);
~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);
bool isStencilBufferMultisampled() const { return fDesc.fSampleCnt > 0; }
/**
* For our purposes, "Mixed Sampled" means the stencil buffer is multisampled but the color
* buffer is not.
*/
bool isMixedSampled() const { return fFlags & GrRenderTargetPriv::Flags::kMixedSampled; }
/**
* "Unified Sampled" means the stencil and color buffers are both multisampled.
*/
bool isUnifiedMultisampled() const { return fDesc.fSampleCnt > 0 && !this->isMixedSampled(); }
/**
* Returns the number of samples/pixel in the stencil buffer (Zero if non-MSAA).
*/
int numStencilSamples() const { return fDesc.fSampleCnt; }
/**
* Returns the number of samples/pixel in the color buffer (Zero if non-MSAA or mixed sampled).
*/
int numColorSamples() const { return this->isMixedSampled() ? 0 : fDesc.fSampleCnt; }
void setLastDrawTarget(GrDrawTarget* dt);
GrDrawTarget* getLastDrawTarget() { return fLastDrawTarget; }
GrRenderTargetPriv::Flags testingOnly_getFlags() const;
private:
// Deferred version
GrRenderTargetProxy(const GrCaps&, const GrSurfaceDesc&, SkBackingFit, SkBudgeted);
// Wrapped version
GrRenderTargetProxy(const GrCaps&, 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;
// These don't usually get computed until the render target is instantiated, but the render
// target proxy may need to answer queries about it before then. And since in the deferred case
// we know the newly created render target will be internal, we are able to precompute what the
// flags will ultimately end up being. In the wrapped case we just copy the wrapped
// rendertarget's info here.
GrRenderTargetPriv::Flags fFlags;
// 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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