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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 "GrAppliedClip.h"
#include "GrOpFlushState.h"
#include "GrPipeline.h"
#include "GrProcessorSet.h"
#include "GrRect.h"
#include "GrUserStencilSettings.h"
/**
* 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 at the same time 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(GrPaint&& paint, OpArgs... opArgs);
enum class Flags : uint32_t {
kNone = 0x0,
kSnapVerticesToPixelCenters = 0x1,
};
GR_DECL_BITFIELD_CLASS_OPS_FRIENDS(Flags);
GrSimpleMeshDrawOpHelper(const MakeArgs& args, GrAAType aaType, Flags flags = Flags::kNone)
: fProcessors(args.fProcessorSet)
, fPipelineFlags(args.fSRGBFlags)
, fAAType((int)aaType)
, fRequiresDstTexture(false)
, fUsesLocalCoords(false)
, fCompatibleWithAlphaAsCoveage(false) {
SkDEBUGCODE(fDidAnalysis = false);
if (GrAATypeIsHW(aaType)) {
fPipelineFlags |= GrPipeline::kHWAntialias_Flag;
}
if (flags & Flags::kSnapVerticesToPixelCenters) {
fPipelineFlags |= GrPipeline::kSnapVerticesToPixelCenters_Flag;
}
}
~GrSimpleMeshDrawOpHelper() {
if (fProcessors) {
fProcessors->~GrProcessorSet();
}
}
GrSimpleMeshDrawOpHelper() = delete;
GrSimpleMeshDrawOpHelper(const GrSimpleMeshDrawOpHelper&) = delete;
GrSimpleMeshDrawOpHelper& operator=(const GrSimpleMeshDrawOpHelper&) = delete;
GrDrawOp::FixedFunctionFlags fixedFunctionFlags() const {
return GrAATypeIsHW((this->aaType())) ? GrDrawOp::FixedFunctionFlags::kUsesHWAA
: GrDrawOp::FixedFunctionFlags::kNone;
}
bool isCompatible(const GrSimpleMeshDrawOpHelper& that, const GrCaps& caps,
const SkRect& aBounds, const SkRect& bBounds) const {
if (SkToBool(fProcessors) != SkToBool(that.fProcessors)) {
return false;
}
if (fProcessors) {
if (*fProcessors != *that.fProcessors) {
return false;
}
if (fRequiresDstTexture || (fProcessors->xferProcessor() &&
fProcessors->xferProcessor()->xferBarrierType(caps))) {
if (GrRectsTouchOrOverlap(aBounds, bBounds)) {
return false;
}
}
}
bool result = fPipelineFlags == that.fPipelineFlags && fAAType == that.fAAType;
SkASSERT(!result || fCompatibleWithAlphaAsCoveage == that.fCompatibleWithAlphaAsCoveage);
SkASSERT(!result || fUsesLocalCoords == that.fUsesLocalCoords);
return result;
}
bool xpRequiresDstTexture(const GrCaps& caps, const GrAppliedClip* clip,
GrProcessorAnalysisCoverage geometryCoverage, GrColor* color) {
SkDEBUGCODE(fDidAnalysis = true);
GrProcessorSet::Analysis analysis;
if (fProcessors) {
GrProcessorAnalysisCoverage coverage = geometryCoverage;
if (GrProcessorAnalysisCoverage::kNone == coverage) {
coverage = clip->clipCoverageFragmentProcessor()
? GrProcessorAnalysisCoverage::kSingleChannel
: GrProcessorAnalysisCoverage::kNone;
}
bool isMixedSamples = this->aaType() == GrAAType::kMixedSamples;
analysis = fProcessors->finalize(*color, coverage, clip, isMixedSamples, caps, color);
} else {
analysis = GrProcessorSet::EmptySetAnalysis();
}
fRequiresDstTexture = analysis.requiresDstTexture();
fUsesLocalCoords = analysis.usesLocalCoords();
fCompatibleWithAlphaAsCoveage = analysis.isCompatibleWithCoverageAsAlpha();
return analysis.requiresDstTexture();
}
bool usesLocalCoords() const {
SkASSERT(fDidAnalysis);
return fUsesLocalCoords;
}
bool compatibleWithAlphaAsCoverage() const { return fCompatibleWithAlphaAsCoveage; }
GrPipeline* makePipeline(GrMeshDrawOp::Target* target) const {
return target->allocPipeline(this->pipelineInitArgs(target));
}
struct MakeArgs {
private:
MakeArgs() = default;
GrProcessorSet* fProcessorSet;
uint32_t fSRGBFlags;
friend class GrSimpleMeshDrawOpHelper;
};
protected:
GrAAType aaType() const { return static_cast<GrAAType>(fAAType); }
uint32_t pipelineFlags() const { return fPipelineFlags; }
const GrProcessorSet& processors() const {
return fProcessors ? *fProcessors : GrProcessorSet::EmptySet();
}
GrPipeline::InitArgs pipelineInitArgs(GrMeshDrawOp::Target* target) const {
GrPipeline::InitArgs args;
args.fFlags = this->pipelineFlags();
args.fProcessors = &this->processors();
args.fRenderTarget = target->renderTarget();
args.fAppliedClip = target->clip();
args.fDstProxy = target->dstProxy();
args.fCaps = &target->caps();
args.fResourceProvider = target->resourceProvider();
return args;
}
private:
GrProcessorSet* fProcessors;
unsigned fPipelineFlags : 8;
unsigned fAAType : 2;
unsigned fRequiresDstTexture : 1;
unsigned fUsesLocalCoords : 1;
unsigned fCompatibleWithAlphaAsCoveage : 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 declarations can't be templated, so this is a pass through function instead.
template <typename Op, typename... OpArgs>
static std::unique_ptr<GrDrawOp> FactoryHelper(GrPaint&& paint, OpArgs... opArgs) {
return GrSimpleMeshDrawOpHelper::FactoryHelper<Op, OpArgs...>(
std::move(paint), std::forward<OpArgs>(opArgs)...);
}
GrSimpleMeshDrawOpHelperWithStencil(const MakeArgs& args, GrAAType aaType,
const GrUserStencilSettings* stencilSettings,
Flags flags = Flags::kNone)
: INHERITED(args, aaType, flags)
, fStencilSettings(stencilSettings ? stencilSettings
: &GrUserStencilSettings::kUnused) {}
GrDrawOp::FixedFunctionFlags fixedFunctionFlags() const {
GrDrawOp::FixedFunctionFlags flags = INHERITED::fixedFunctionFlags();
if (fStencilSettings != &GrUserStencilSettings::kUnused) {
flags |= GrDrawOp::FixedFunctionFlags::kUsesStencil;
}
return flags;
}
using GrSimpleMeshDrawOpHelper::xpRequiresDstTexture;
using GrSimpleMeshDrawOpHelper::usesLocalCoords;
using GrSimpleMeshDrawOpHelper::compatibleWithAlphaAsCoverage;
bool isCompatible(const GrSimpleMeshDrawOpHelperWithStencil& that, const GrCaps& caps,
const SkRect& aBounds, const SkRect& bBounds) const {
return INHERITED::isCompatible(that, caps, aBounds, bBounds) &&
fStencilSettings == that.fStencilSettings;
}
GrPipeline* makePipeline(GrMeshDrawOp::Target* target) const {
auto args = INHERITED::pipelineInitArgs(target);
args.fUserStencil = fStencilSettings;
return target->allocPipeline(args);
}
private:
const GrUserStencilSettings* fStencilSettings;
typedef GrSimpleMeshDrawOpHelper INHERITED;
};
template <typename Op, typename... OpArgs>
std::unique_ptr<GrDrawOp> GrSimpleMeshDrawOpHelper::FactoryHelper(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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