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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/gpu/GrCaps.h"
- #include "src/gpu/GrSurfaceProxy.h"
- #include "src/gpu/GrSwizzle.h"
- class GrResourceProvider;
- class GrRenderTargetProxyPriv;
- // 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 {
- public:
- 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->config()) > 0 &&
- this->canChangeStencilAttachment();
- }
- /*
- * 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 = SkTMax(numStencilSamples, fNumStencilSamples);
- }
- /**
- * Returns the number of stencil samples required by this proxy.
- * NOTE: Once instantiated, the actual render target may have more samples, but it is guaranteed
- * to have at least this many. (After a multisample stencil buffer has been attached to a render
- * target, we never "downgrade" it to one with fewer samples.)
- */
- 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;
- const GrSwizzle& outputSwizzle() const { return fOutputSwizzle; }
- bool wrapsVkSecondaryCB() const { return fWrapsVkSecondaryCB == WrapsVkSecondaryCB::kYes; }
- // TODO: move this to a priv class!
- bool refsWrappedObjects() const;
- // Provides access to special purpose functions.
- GrRenderTargetProxyPriv rtPriv();
- const GrRenderTargetProxyPriv rtPriv() const;
- protected:
- friend class GrProxyProvider; // for ctors
- friend class GrRenderTargetProxyPriv;
- // Deferred version
- GrRenderTargetProxy(const GrCaps&, const GrBackendFormat&, const GrSurfaceDesc&,
- int sampleCount, GrSurfaceOrigin, const GrSwizzle& textureSwizzle,
- const GrSwizzle& outputSwizzle, SkBackingFit, SkBudgeted, GrProtected,
- GrInternalSurfaceFlags);
- 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.
- GrRenderTargetProxy(LazyInstantiateCallback&&, LazyInstantiationType lazyType,
- const GrBackendFormat&, const GrSurfaceDesc&, int sampleCount,
- GrSurfaceOrigin, const GrSwizzle& textureSwizzle,
- const GrSwizzle& outputSwizzle, SkBackingFit, SkBudgeted, GrProtected,
- GrInternalSurfaceFlags, WrapsVkSecondaryCB wrapsVkSecondaryCB);
- // Wrapped version
- GrRenderTargetProxy(sk_sp<GrSurface>, GrSurfaceOrigin, const GrSwizzle& textureSwizzle,
- const GrSwizzle& outputSwizzle,
- WrapsVkSecondaryCB wrapsVkSecondaryCB = WrapsVkSecondaryCB::kNo);
- sk_sp<GrSurface> createSurface(GrResourceProvider*) const override;
- private:
- void setGLRTFBOIDIs0() {
- fSurfaceFlags |= GrInternalSurfaceFlags::kGLRTFBOIDIs0;
- }
- bool glRTFBOIDIs0() const {
- return fSurfaceFlags & GrInternalSurfaceFlags::kGLRTFBOIDIs0;
- }
- bool canChangeStencilAttachment() const;
- size_t onUninstantiatedGpuMemorySize() const override;
- SkDEBUGCODE(void onValidateSurface(const GrSurface*) 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;
- GrSwizzle fOutputSwizzle;
- // This is to fix issue in large comment above. Without the padding we end 6 bytes into a 16
- // byte range, so the GrTextureProxy ends up starting 8 byte aligned by not 16. We add the
- // padding here to get us right up to the 16 byte alignment (technically any padding of 3-10
- // bytes would work since it always goes up to 8 byte alignment, but we use 10 to more explicit
- // about what we're doing).
- char fDummyPadding[10];
- // For wrapped render targets the actual GrRenderTarget is stored in the GrIORefProxy class.
- // For deferred proxies that pointer is filled in when we need to instantiate the
- // deferred resource.
- typedef GrSurfaceProxy INHERITED;
- };
- #endif
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