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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrSimpleMeshDrawOpHelper_DEFINED
#define GrSimpleMeshDrawOpHelper_DEFINED
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrMemoryPool.h" // only here bc of the templated FactoryHelper
#include "GrMeshDrawOp.h"
#include "GrOpFlushState.h"
#include "GrPipeline.h"
#include <new>
struct SkRect;
/**
* This class can be used to help implement simple mesh draw ops. It reduces the amount of
* boilerplate code to type and also provides a mechanism for optionally allocating space for a
* GrProcessorSet based on a GrPaint. It is intended to be used by ops that construct a single
* GrPipeline for a uniform primitive color and a GrPaint.
*/
class GrSimpleMeshDrawOpHelper {
public:
struct MakeArgs;
/**
* This can be used by a Op class to perform allocation and initialization such that a
* GrProcessorSet (if required) is allocated as part of the the same allocation that as
* the Op instance. It requires that Op implements a constructor of the form:
* Op(MakeArgs, GrColor, OpArgs...)
* which is public or made accessible via 'friend'.
*/
template <typename Op, typename... OpArgs>
static std::unique_ptr<GrDrawOp> FactoryHelper(GrContext*, GrPaint&& paint, OpArgs... opArgs);
enum class Flags : uint32_t {
kNone = 0x0,
kSnapVerticesToPixelCenters = 0x1,
};
GR_DECL_BITFIELD_CLASS_OPS_FRIENDS(Flags);
GrSimpleMeshDrawOpHelper(const MakeArgs&, GrAAType, Flags = Flags::kNone);
~GrSimpleMeshDrawOpHelper();
GrSimpleMeshDrawOpHelper() = delete;
GrSimpleMeshDrawOpHelper(const GrSimpleMeshDrawOpHelper&) = delete;
GrSimpleMeshDrawOpHelper& operator=(const GrSimpleMeshDrawOpHelper&) = delete;
GrDrawOp::FixedFunctionFlags fixedFunctionFlags() const;
bool isCompatible(const GrSimpleMeshDrawOpHelper& that, const GrCaps&, const SkRect& thisBounds,
const SkRect& thatBounds) const;
/**
* Finalizes the processor set and determines whether the destination must be provided
* to the fragment shader as a texture for blending.
*
* @param geometryCoverage Describes the coverage output of the op's geometry processor
* @param geometryColor An in/out param. As input this informs processor analysis about the
* color the op expects to output from its geometry processor. As output
* this may be set to a known color in which case the op must output this
* color from its geometry processor instead.
*/
GrDrawOp::RequiresDstTexture xpRequiresDstTexture(const GrCaps& caps, const GrAppliedClip* clip,
GrPixelConfigIsClamped dstIsClamped,
GrProcessorAnalysisCoverage geometryCoverage,
GrProcessorAnalysisColor* geometryColor);
/**
* Version of above that can be used by ops that have a constant color geometry processor
* output. The op passes this color as 'geometryColor' and after return if 'geometryColor' has
* changed the op must override its geometry processor color output with the new color.
*/
GrDrawOp::RequiresDstTexture xpRequiresDstTexture(const GrCaps&, const GrAppliedClip*,
GrPixelConfigIsClamped dstIsClamped,
GrProcessorAnalysisCoverage geometryCoverage,
GrColor* geometryColor);
bool usesLocalCoords() const {
SkASSERT(fDidAnalysis);
return fUsesLocalCoords;
}
bool compatibleWithAlphaAsCoverage() const { return fCompatibleWithAlphaAsCoveage; }
/** Makes a pipeline that consumes the processor set and the op's applied clip. */
GrPipeline* makePipeline(GrMeshDrawOp::Target* target) {
return this->internalMakePipeline(target, this->pipelineInitArgs(target));
}
struct MakeArgs {
private:
MakeArgs() = default;
GrProcessorSet* fProcessorSet;
uint32_t fSRGBFlags;
friend class GrSimpleMeshDrawOpHelper;
};
void visitProxies(const std::function<void(GrSurfaceProxy*)>& func) const {
if (fProcessors) {
fProcessors->visitProxies(func);
}
}
SkString dumpInfo() const;
protected:
GrAAType aaType() const { return static_cast<GrAAType>(fAAType); }
uint32_t pipelineFlags() const { return fPipelineFlags; }
GrPipeline::InitArgs pipelineInitArgs(GrMeshDrawOp::Target* target) const;
GrPipeline* internalMakePipeline(GrMeshDrawOp::Target*, const GrPipeline::InitArgs&);
private:
GrProcessorSet* fProcessors;
unsigned fPipelineFlags : 8;
unsigned fAAType : 2;
unsigned fRequiresDstTexture : 1;
unsigned fUsesLocalCoords : 1;
unsigned fCompatibleWithAlphaAsCoveage : 1;
SkDEBUGCODE(unsigned fMadePipeline : 1;)
SkDEBUGCODE(unsigned fDidAnalysis : 1;)
};
/**
* This class extends GrSimpleMeshDrawOpHelper to support an optional GrUserStencilSettings. This
* uses private inheritance because it non-virtually overrides methods in the base class and should
* never be used with a GrSimpleMeshDrawOpHelper pointer or reference.
*/
class GrSimpleMeshDrawOpHelperWithStencil : private GrSimpleMeshDrawOpHelper {
public:
using MakeArgs = GrSimpleMeshDrawOpHelper::MakeArgs;
using Flags = GrSimpleMeshDrawOpHelper::Flags;
using GrSimpleMeshDrawOpHelper::visitProxies;
// using declarations can't be templated, so this is a pass through function instead.
template <typename Op, typename... OpArgs>
static std::unique_ptr<GrDrawOp> FactoryHelper(GrContext* context, GrPaint&& paint,
OpArgs... opArgs) {
return GrSimpleMeshDrawOpHelper::FactoryHelper<Op, OpArgs...>(
context, std::move(paint), std::forward<OpArgs>(opArgs)...);
}
GrSimpleMeshDrawOpHelperWithStencil(const MakeArgs&, GrAAType, const GrUserStencilSettings*,
Flags = Flags::kNone);
GrDrawOp::FixedFunctionFlags fixedFunctionFlags() const;
using GrSimpleMeshDrawOpHelper::xpRequiresDstTexture;
using GrSimpleMeshDrawOpHelper::usesLocalCoords;
using GrSimpleMeshDrawOpHelper::compatibleWithAlphaAsCoverage;
bool isCompatible(const GrSimpleMeshDrawOpHelperWithStencil& that, const GrCaps&,
const SkRect& thisBounds, const SkRect& thatBounds) const;
const GrPipeline* makePipeline(GrMeshDrawOp::Target*);
SkString dumpInfo() const;
private:
const GrUserStencilSettings* fStencilSettings;
typedef GrSimpleMeshDrawOpHelper INHERITED;
};
template <typename Op, typename... OpArgs>
std::unique_ptr<GrDrawOp> GrSimpleMeshDrawOpHelper::FactoryHelper(GrContext* context,
GrPaint&& paint,
OpArgs... opArgs) {
MakeArgs makeArgs;
makeArgs.fSRGBFlags = GrPipeline::SRGBFlagsFromPaint(paint);
GrColor color = paint.getColor();
if (paint.isTrivial()) {
makeArgs.fProcessorSet = nullptr;
return std::unique_ptr<GrDrawOp>(new Op(makeArgs, color, std::forward<OpArgs>(opArgs)...));
} else {
char* mem = (char*)GrOp::operator new(sizeof(Op) + sizeof(GrProcessorSet));
char* setMem = mem + sizeof(Op);
makeArgs.fProcessorSet = new (setMem) GrProcessorSet(std::move(paint));
return std::unique_ptr<GrDrawOp>(
new (mem) Op(makeArgs, color, std::forward<OpArgs>(opArgs)...));
}
}
GR_MAKE_BITFIELD_CLASS_OPS(GrSimpleMeshDrawOpHelper::Flags)
#endif
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