gm/clockwise.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2018 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "gm/gm.h"
 #include "include/core/SkBlendMode.h"
 #include "include/core/SkCanvas.h"
 #include "include/core/SkColorSpace.h"
 #include "include/core/SkMatrix.h"
 #include "include/core/SkPoint.h"
 #include "include/core/SkRect.h"
 #include "include/core/SkRefCnt.h"
 #include "include/core/SkSize.h"
 #include "include/core/SkString.h"
 #include "include/core/SkTypes.h"
 #include "include/gpu/GrRecordingContext.h"
 #include "include/gpu/GrTypes.h"
 #include "include/private/GrTypesPriv.h"
 #include "include/private/SkColorData.h"
 #include "src/gpu/GrBuffer.h"
 #include "src/gpu/GrCaps.h"
 #include "src/gpu/GrColorSpaceXform.h"
 #include "src/gpu/GrContextPriv.h"
 #include "src/gpu/GrGeometryProcessor.h"
 #include "src/gpu/GrGpuBuffer.h"
 #include "src/gpu/GrMemoryPool.h"
 #include "src/gpu/GrOpFlushState.h"
 #include "src/gpu/GrOpsRenderPass.h"
 #include "src/gpu/GrPipeline.h"
 #include "src/gpu/GrPrimitiveProcessor.h"
 #include "src/gpu/GrProcessor.h"
 #include "src/gpu/GrProcessorSet.h"
 #include "src/gpu/GrProgramInfo.h"
 #include "src/gpu/GrRecordingContextPriv.h"
 #include "src/gpu/GrRenderTargetContext.h"
 #include "src/gpu/GrRenderTargetContextPriv.h"
 #include "src/gpu/GrResourceProvider.h"
 #include "src/gpu/GrSamplerState.h"
 #include "src/gpu/GrShaderCaps.h"
 #include "src/gpu/GrShaderVar.h"
 #include "src/gpu/GrSurfaceProxy.h"
 #include "src/gpu/GrTextureProxy.h"
 #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
 #include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
 #include "src/gpu/glsl/GrGLSLPrimitiveProcessor.h"
 #include "src/gpu/glsl/GrGLSLVarying.h"
 #include "src/gpu/ops/GrDrawOp.h"
 #include "src/gpu/ops/GrOp.h"
 #include "tools/gpu/ProxyUtils.h"

 #include <memory>
 #include <utility>

 class GrAppliedClip;
 class GrGLSLProgramDataManager;

 namespace {

 static constexpr GrGeometryProcessor::Attribute gVertex =
         {"position", kFloat2_GrVertexAttribType, kFloat2_GrSLType};

 /**
  * This is a GPU-backend specific test. It ensures that SkSL properly identifies clockwise-winding
  * triangles (sk_Clockwise), in terms of to Skia device space, in all backends and with all render
  * target origins. We draw clockwise triangles green and counter-clockwise red.
  */
 class ClockwiseGM : public skiagm::GpuGM {
     SkString onShortName() override { return SkString("clockwise"); }
     SkISize onISize() override { return {300, 200}; }
     void onDraw(GrRecordingContext*, GrRenderTargetContext*, SkCanvas*) override;
 };

 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // SkSL code.

 class ClockwiseTestProcessor : public GrGeometryProcessor {
 public:
     static GrGeometryProcessor* Make(SkArenaAlloc* arena, bool readSkFragCoord) {
         return arena->make<ClockwiseTestProcessor>(readSkFragCoord);
     }

     const char* name() const final { return "ClockwiseTestProcessor"; }

     void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {
         b->add32(fReadSkFragCoord);
     }

     GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;

     bool readSkFragCoord() const { return fReadSkFragCoord; }

 private:
     friend class ::SkArenaAlloc; // for access to ctor

     ClockwiseTestProcessor(bool readSkFragCoord)
             : GrGeometryProcessor(kClockwiseTestProcessor_ClassID)
             , fReadSkFragCoord(readSkFragCoord) {
         this->setVertexAttributes(&gVertex, 1);
     }

     const bool fReadSkFragCoord;

     using INHERITED = GrGeometryProcessor;
 };

 class GLSLClockwiseTestProcessor : public GrGLSLGeometryProcessor {
     void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&) override {}

     void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
         const ClockwiseTestProcessor& proc = args.fGP.cast<ClockwiseTestProcessor>();
         args.fVaryingHandler->emitAttributes(proc);
         gpArgs->fPositionVar.set(kFloat2_GrSLType, "position");
         args.fFragBuilder->codeAppendf(
                 "%s = sk_Clockwise ? half4(0,1,0,1) : half4(1,0,0,1);", args.fOutputColor);
         if (!proc.readSkFragCoord()) {
             args.fFragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
         } else {
             // Verify layout(origin_upper_left) on gl_FragCoord does not affect gl_FrontFacing.
             args.fFragBuilder->codeAppendf("%s = half4(min(half(sk_FragCoord.y), 1));",
                                            args.fOutputCoverage);
         }
     }
 };

 GrGLSLPrimitiveProcessor* ClockwiseTestProcessor::createGLSLInstance(
         const GrShaderCaps&) const {
     return new GLSLClockwiseTestProcessor;
 }

 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Draw Op.

 class ClockwiseTestOp : public GrDrawOp {
 public:
     DEFINE_OP_CLASS_ID

     static std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context,
                                           bool readSkFragCoord, int y = 0) {
         GrOpMemoryPool* pool = context->priv().opMemoryPool();
         return pool->allocate<ClockwiseTestOp>(readSkFragCoord, y);
     }

 private:
     ClockwiseTestOp(bool readSkFragCoord, float y)
             : GrDrawOp(ClassID())
             , fReadSkFragCoord(readSkFragCoord)
             , fY(y) {
         this->setBounds(SkRect::MakeXYWH(0, fY, 100, 100), HasAABloat::kNo, IsHairline::kNo);
     }

     const char* name() const override { return "ClockwiseTestOp"; }
     FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
     GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*,
                                       bool hasMixedSampledCoverage, GrClampType) override {
         return GrProcessorSet::EmptySetAnalysis();
     }

     GrProgramInfo* createProgramInfo(const GrCaps* caps,
                                      SkArenaAlloc* arena,
                                      const GrSurfaceProxyView* writeView,
                                      GrAppliedClip&& appliedClip,
                                      const GrXferProcessor::DstProxyView& dstProxyView) const {
         GrGeometryProcessor* geomProc = ClockwiseTestProcessor::Make(arena, fReadSkFragCoord);

         return sk_gpu_test::CreateProgramInfo(caps, arena, writeView,
                                               std::move(appliedClip), dstProxyView,
                                               geomProc, SkBlendMode::kPlus,
                                               GrPrimitiveType::kTriangleStrip);
     }

     GrProgramInfo* createProgramInfo(GrOpFlushState* flushState) const {
         return this->createProgramInfo(&flushState->caps(),
                                        flushState->allocator(),
                                        flushState->writeView(),
                                        flushState->detachAppliedClip(),
                                        flushState->dstProxyView());
     }

     void onPrePrepare(GrRecordingContext* context,
                       const GrSurfaceProxyView* writeView,
                       GrAppliedClip* clip,
                       const GrXferProcessor::DstProxyView& dstProxyView) final {
         SkArenaAlloc* arena = context->priv().recordTimeAllocator();

         // This is equivalent to a GrOpFlushState::detachAppliedClip
         GrAppliedClip appliedClip = clip ? std::move(*clip) : GrAppliedClip::Disabled();

         fProgramInfo = this->createProgramInfo(context->priv().caps(), arena, writeView,
                                                std::move(appliedClip), dstProxyView);

         context->priv().recordProgramInfo(fProgramInfo);
     }

     void onPrepare(GrOpFlushState* flushState) override {
         SkPoint vertices[4] = {
             {100, fY},
             {0, fY+100},
             {0, fY},
             {100, fY+100},
         };
         fVertexBuffer = flushState->resourceProvider()->createBuffer(
                 sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern, vertices);
     }

     void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override {
         if (!fVertexBuffer) {
             return;
         }

         if (!fProgramInfo) {
             fProgramInfo = this->createProgramInfo(flushState);
         }

         flushState->bindPipeline(*fProgramInfo, SkRect::MakeXYWH(0, fY, 100, 100));
         flushState->bindBuffers(nullptr, nullptr, std::move(fVertexBuffer));
         flushState->draw(4, 0);
     }

     sk_sp<GrBuffer> fVertexBuffer;
     const bool      fReadSkFragCoord;
     const float     fY;

     // The program info (and both the GrPipeline and GrPrimitiveProcessor it relies on), when
     // allocated, are allocated in either the ddl-record-time or flush-time arena. It is the
     // arena's job to free up their memory so we just have a bare programInfo pointer here. We
     // don't even store the GrPipeline and GrPrimitiveProcessor pointers here bc they are
     // guaranteed to have the same lifetime as the program info.
     GrProgramInfo*  fProgramInfo = nullptr;

     friend class ::GrOpMemoryPool; // for ctor

     using INHERITED = GrDrawOp;
 };

 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Test.

 void ClockwiseGM::onDraw(GrRecordingContext* ctx, GrRenderTargetContext* rtc, SkCanvas* canvas) {
     rtc->clear(SK_PMColor4fBLACK);

     // Draw the test directly to the frame buffer.
     rtc->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
     rtc->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));

     // Draw the test to an off-screen, top-down render target.
     GrColorType rtcColorType = rtc->colorInfo().colorType();
     if (auto topLeftRTC = GrRenderTargetContext::Make(
                 ctx, rtcColorType, nullptr, SkBackingFit::kExact, {100, 200}, 1,
                 GrMipmapped::kNo, GrProtected::kNo, kTopLeft_GrSurfaceOrigin, SkBudgeted::kYes,
                 nullptr)) {
         topLeftRTC->clear(SK_PMColor4fTRANSPARENT);
         topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
         topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
         rtc->drawTexture(nullptr,
                          topLeftRTC->readSurfaceView(),
                          rtc->colorInfo().alphaType(),
                          GrSamplerState::Filter::kNearest,
                          GrSamplerState::MipmapMode::kNone,
                          SkBlendMode::kSrcOver,
                          SK_PMColor4fWHITE,
                          {0, 0, 100, 200},
                          {100, 0, 200, 200},
                          GrAA::kNo,
                          GrQuadAAFlags::kNone,
                          SkCanvas::SrcRectConstraint::kStrict_SrcRectConstraint,
                          SkMatrix::I(),
                          nullptr);
     }

     // Draw the test to an off-screen, bottom-up render target.
     if (auto topLeftRTC = GrRenderTargetContext::Make(
                 ctx, rtcColorType, nullptr, SkBackingFit::kExact, {100, 200}, 1,
                 GrMipmapped::kNo, GrProtected::kNo, kBottomLeft_GrSurfaceOrigin, SkBudgeted::kYes,
                 nullptr)) {
         topLeftRTC->clear(SK_PMColor4fTRANSPARENT);
         topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
         topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
         rtc->drawTexture(nullptr,
                          topLeftRTC->readSurfaceView(),
                          rtc->colorInfo().alphaType(),
                          GrSamplerState::Filter::kNearest,
                          GrSamplerState::MipmapMode::kNone,
                          SkBlendMode::kSrcOver,
                          SK_PMColor4fWHITE,
                          {0, 0, 100, 200},
                          {200, 0, 300, 200},
                          GrAA::kNo,
                          GrQuadAAFlags::kNone,
                          SkCanvas::SrcRectConstraint::kStrict_SrcRectConstraint,
                          SkMatrix::I(),
                          nullptr);
     }
 }

 ////////////////////////////////////////////////////////////////////////////////////////////////////

 DEF_GM( return new ClockwiseGM(); )

 }  // namespace
	/*
	* Copyright 2018 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "gm/gm.h"
	#include "include/core/SkBlendMode.h"
	#include "include/core/SkCanvas.h"
	#include "include/core/SkColorSpace.h"
	#include "include/core/SkMatrix.h"
	#include "include/core/SkPoint.h"
	#include "include/core/SkRect.h"
	#include "include/core/SkRefCnt.h"
	#include "include/core/SkSize.h"
	#include "include/core/SkString.h"
	#include "include/core/SkTypes.h"
	#include "include/gpu/GrRecordingContext.h"
	#include "include/gpu/GrTypes.h"
	#include "include/private/GrTypesPriv.h"
	#include "include/private/SkColorData.h"
	#include "src/gpu/GrBuffer.h"
	#include "src/gpu/GrCaps.h"
	#include "src/gpu/GrColorSpaceXform.h"
	#include "src/gpu/GrContextPriv.h"
	#include "src/gpu/GrGeometryProcessor.h"
	#include "src/gpu/GrGpuBuffer.h"
	#include "src/gpu/GrMemoryPool.h"
	#include "src/gpu/GrOpFlushState.h"
	#include "src/gpu/GrOpsRenderPass.h"
	#include "src/gpu/GrPipeline.h"
	#include "src/gpu/GrPrimitiveProcessor.h"
	#include "src/gpu/GrProcessor.h"
	#include "src/gpu/GrProcessorSet.h"
	#include "src/gpu/GrProgramInfo.h"
	#include "src/gpu/GrRecordingContextPriv.h"
	#include "src/gpu/GrRenderTargetContext.h"
	#include "src/gpu/GrRenderTargetContextPriv.h"
	#include "src/gpu/GrResourceProvider.h"
	#include "src/gpu/GrSamplerState.h"
	#include "src/gpu/GrShaderCaps.h"
	#include "src/gpu/GrShaderVar.h"
	#include "src/gpu/GrSurfaceProxy.h"
	#include "src/gpu/GrTextureProxy.h"
	#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
	#include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
	#include "src/gpu/glsl/GrGLSLPrimitiveProcessor.h"
	#include "src/gpu/glsl/GrGLSLVarying.h"
	#include "src/gpu/ops/GrDrawOp.h"
	#include "src/gpu/ops/GrOp.h"
	#include "tools/gpu/ProxyUtils.h"

	#include <memory>
	#include <utility>

	class GrAppliedClip;
	class GrGLSLProgramDataManager;

	namespace {

	static constexpr GrGeometryProcessor::Attribute gVertex =
	{"position", kFloat2_GrVertexAttribType, kFloat2_GrSLType};

	/**
	* This is a GPU-backend specific test. It ensures that SkSL properly identifies clockwise-winding
	* triangles (sk_Clockwise), in terms of to Skia device space, in all backends and with all render
	* target origins. We draw clockwise triangles green and counter-clockwise red.
	*/
	class ClockwiseGM : public skiagm::GpuGM {
	SkString onShortName() override { return SkString("clockwise"); }
	SkISize onISize() override { return {300, 200}; }
	void onDraw(GrRecordingContext, GrRenderTargetContext, SkCanvas*) override;
	};

	////////////////////////////////////////////////////////////////////////////////////////////////////
	// SkSL code.

	class ClockwiseTestProcessor : public GrGeometryProcessor {
	public:
	static GrGeometryProcessor* Make(SkArenaAlloc* arena, bool readSkFragCoord) {
	return arena->make<ClockwiseTestProcessor>(readSkFragCoord);
	}

	const char* name() const final { return "ClockwiseTestProcessor"; }

	void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {
	b->add32(fReadSkFragCoord);
	}

	GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;

	bool readSkFragCoord() const { return fReadSkFragCoord; }

	private:
	friend class ::SkArenaAlloc; // for access to ctor

	ClockwiseTestProcessor(bool readSkFragCoord)
	: GrGeometryProcessor(kClockwiseTestProcessor_ClassID)
	, fReadSkFragCoord(readSkFragCoord) {
	this->setVertexAttributes(&gVertex, 1);
	}

	const bool fReadSkFragCoord;

	using INHERITED = GrGeometryProcessor;
	};

	class GLSLClockwiseTestProcessor : public GrGLSLGeometryProcessor {
	void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&) override {}

	void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
	const ClockwiseTestProcessor& proc = args.fGP.cast<ClockwiseTestProcessor>();
	args.fVaryingHandler->emitAttributes(proc);
	gpArgs->fPositionVar.set(kFloat2_GrSLType, "position");
	args.fFragBuilder->codeAppendf(
	"%s = sk_Clockwise ? half4(0,1,0,1) : half4(1,0,0,1);", args.fOutputColor);
	if (!proc.readSkFragCoord()) {
	args.fFragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
	} else {
	// Verify layout(origin_upper_left) on gl_FragCoord does not affect gl_FrontFacing.
	args.fFragBuilder->codeAppendf("%s = half4(min(half(sk_FragCoord.y), 1));",
	args.fOutputCoverage);
	}
	}
	};

	GrGLSLPrimitiveProcessor* ClockwiseTestProcessor::createGLSLInstance(
	const GrShaderCaps&) const {
	return new GLSLClockwiseTestProcessor;
	}

	////////////////////////////////////////////////////////////////////////////////////////////////////
	// Draw Op.

	class ClockwiseTestOp : public GrDrawOp {
	public:
	DEFINE_OP_CLASS_ID

	static std::unique_ptr<GrDrawOp> Make(GrRecordingContext* context,
	bool readSkFragCoord, int y = 0) {
	GrOpMemoryPool* pool = context->priv().opMemoryPool();
	return pool->allocate<ClockwiseTestOp>(readSkFragCoord, y);
	}

	private:
	ClockwiseTestOp(bool readSkFragCoord, float y)
	: GrDrawOp(ClassID())
	, fReadSkFragCoord(readSkFragCoord)
	, fY(y) {
	this->setBounds(SkRect::MakeXYWH(0, fY, 100, 100), HasAABloat::kNo, IsHairline::kNo);
	}

	const char* name() const override { return "ClockwiseTestOp"; }
	FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
	GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*,
	bool hasMixedSampledCoverage, GrClampType) override {
	return GrProcessorSet::EmptySetAnalysis();
	}

	GrProgramInfo* createProgramInfo(const GrCaps* caps,
	SkArenaAlloc* arena,
	const GrSurfaceProxyView* writeView,
	GrAppliedClip&& appliedClip,
	const GrXferProcessor::DstProxyView& dstProxyView) const {
	GrGeometryProcessor* geomProc = ClockwiseTestProcessor::Make(arena, fReadSkFragCoord);

	return sk_gpu_test::CreateProgramInfo(caps, arena, writeView,
	std::move(appliedClip), dstProxyView,
	geomProc, SkBlendMode::kPlus,
	GrPrimitiveType::kTriangleStrip);
	}

	GrProgramInfo* createProgramInfo(GrOpFlushState* flushState) const {
	return this->createProgramInfo(&flushState->caps(),
	flushState->allocator(),
	flushState->writeView(),
	flushState->detachAppliedClip(),
	flushState->dstProxyView());
	}

	void onPrePrepare(GrRecordingContext* context,
	const GrSurfaceProxyView* writeView,
	GrAppliedClip* clip,
	const GrXferProcessor::DstProxyView& dstProxyView) final {
	SkArenaAlloc* arena = context->priv().recordTimeAllocator();

	// This is equivalent to a GrOpFlushState::detachAppliedClip
	GrAppliedClip appliedClip = clip ? std::move(*clip) : GrAppliedClip::Disabled();

	fProgramInfo = this->createProgramInfo(context->priv().caps(), arena, writeView,
	std::move(appliedClip), dstProxyView);

	context->priv().recordProgramInfo(fProgramInfo);
	}

	void onPrepare(GrOpFlushState* flushState) override {
	SkPoint vertices[4] = {
	{100, fY},
	{0, fY+100},
	{0, fY},
	{100, fY+100},
	};
	fVertexBuffer = flushState->resourceProvider()->createBuffer(
	sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern, vertices);
	}

	void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override {
	if (!fVertexBuffer) {
	return;
	}

	if (!fProgramInfo) {
	fProgramInfo = this->createProgramInfo(flushState);
	}

	flushState->bindPipeline(*fProgramInfo, SkRect::MakeXYWH(0, fY, 100, 100));
	flushState->bindBuffers(nullptr, nullptr, std::move(fVertexBuffer));
	flushState->draw(4, 0);
	}

	sk_sp<GrBuffer> fVertexBuffer;
	const bool fReadSkFragCoord;
	const float fY;

	// The program info (and both the GrPipeline and GrPrimitiveProcessor it relies on), when
	// allocated, are allocated in either the ddl-record-time or flush-time arena. It is the
	// arena's job to free up their memory so we just have a bare programInfo pointer here. We
	// don't even store the GrPipeline and GrPrimitiveProcessor pointers here bc they are
	// guaranteed to have the same lifetime as the program info.
	GrProgramInfo* fProgramInfo = nullptr;

	friend class ::GrOpMemoryPool; // for ctor

	using INHERITED = GrDrawOp;
	};

	////////////////////////////////////////////////////////////////////////////////////////////////////
	// Test.

	void ClockwiseGM::onDraw(GrRecordingContext* ctx, GrRenderTargetContext* rtc, SkCanvas* canvas) {
	rtc->clear(SK_PMColor4fBLACK);

	// Draw the test directly to the frame buffer.
	rtc->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
	rtc->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));

	// Draw the test to an off-screen, top-down render target.
	GrColorType rtcColorType = rtc->colorInfo().colorType();
	if (auto topLeftRTC = GrRenderTargetContext::Make(
	ctx, rtcColorType, nullptr, SkBackingFit::kExact, {100, 200}, 1,
	GrMipmapped::kNo, GrProtected::kNo, kTopLeft_GrSurfaceOrigin, SkBudgeted::kYes,
	nullptr)) {
	topLeftRTC->clear(SK_PMColor4fTRANSPARENT);
	topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
	topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
	rtc->drawTexture(nullptr,
	topLeftRTC->readSurfaceView(),
	rtc->colorInfo().alphaType(),
	GrSamplerState::Filter::kNearest,
	GrSamplerState::MipmapMode::kNone,
	SkBlendMode::kSrcOver,
	SK_PMColor4fWHITE,
	{0, 0, 100, 200},
	{100, 0, 200, 200},
	GrAA::kNo,
	GrQuadAAFlags::kNone,
	SkCanvas::SrcRectConstraint::kStrict_SrcRectConstraint,
	SkMatrix::I(),
	nullptr);
	}

	// Draw the test to an off-screen, bottom-up render target.
	if (auto topLeftRTC = GrRenderTargetContext::Make(
	ctx, rtcColorType, nullptr, SkBackingFit::kExact, {100, 200}, 1,
	GrMipmapped::kNo, GrProtected::kNo, kBottomLeft_GrSurfaceOrigin, SkBudgeted::kYes,
	nullptr)) {
	topLeftRTC->clear(SK_PMColor4fTRANSPARENT);
	topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
	topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
	rtc->drawTexture(nullptr,
	topLeftRTC->readSurfaceView(),
	rtc->colorInfo().alphaType(),
	GrSamplerState::Filter::kNearest,
	GrSamplerState::MipmapMode::kNone,
	SkBlendMode::kSrcOver,
	SK_PMColor4fWHITE,
	{0, 0, 100, 200},
	{200, 0, 300, 200},
	GrAA::kNo,
	GrQuadAAFlags::kNone,
	SkCanvas::SrcRectConstraint::kStrict_SrcRectConstraint,
	SkMatrix::I(),
	nullptr);
	}
	}

	////////////////////////////////////////////////////////////////////////////////////////////////////

	DEF_GM( return new ClockwiseGM(); )

	} // namespace