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skia2/gm/clockwise.cpp
Robert Phillips 405413fcec Clarify that the OpArgs' outputSwizzle comes from its GrRenderTargetProxy 
Since we want to collect shader information early, this attempts to make clear that numSamples, origin and outputSwizzle can all be obtained from the target renderTargetProxy.


Change-Id: I42e0fd79e2163f17673ccdd344a31fbaadac5f53
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/246298
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2019-10-04 18:03:32 +00:00

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/*
* 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/GrContext.h"
#include "include/gpu/GrTypes.h"
#include "include/private/GrRecordingContext.h"
#include "include/private/GrTypesPriv.h"
#include "include/private/SkColorData.h"
#include "src/gpu/GrBuffer.h"
#include "src/gpu/GrCaps.h"
#include "src/gpu/GrClip.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/GrMesh.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/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 <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(GrContext*, GrRenderTargetContext*, SkCanvas*) override;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// SkSL code.
class ClockwiseTestProcessor : public GrGeometryProcessor {
public:
ClockwiseTestProcessor(bool readSkFragCoord)
: GrGeometryProcessor(kClockwiseTestProcessor_ClassID)
, fReadSkFragCoord(readSkFragCoord) {
this->setVertexAttributes(&gVertex, 1);
}
const char* name() const override { return "ClockwiseTestProcessor"; }
void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {
b->add32(fReadSkFragCoord);
}
GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;
private:
const bool fReadSkFragCoord;
friend class GLSLClockwiseTestProcessor;
};
class GLSLClockwiseTestProcessor : public GrGLSLGeometryProcessor {
void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor&,
FPCoordTransformIter&& transformIter) 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.fReadSkFragCoord) {
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();
}
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;
}
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kPlus,
flushState->drawOpArgs().outputSwizzle());
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(fVertexBuffer));
flushState->opsRenderPass()->draw(ClockwiseTestProcessor(fReadSkFragCoord), pipeline,
nullptr, nullptr, &mesh, 1,
SkRect::MakeXYWH(0, fY, 100, 100));
}
sk_sp<GrBuffer> fVertexBuffer;
const bool fReadSkFragCoord;
const float fY;
friend class ::GrOpMemoryPool; // for ctor
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// Test.
void ClockwiseGM::onDraw(GrContext* ctx, GrRenderTargetContext* rtc, SkCanvas* canvas) {
rtc->clear(nullptr, { 0, 0, 0, 1 }, GrRenderTargetContext::CanClearFullscreen::kYes);
// 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.
if (auto topLeftRTC = ctx->priv().makeDeferredRenderTargetContext(
SkBackingFit::kExact, 100, 200, rtc->colorInfo().colorType(), nullptr, 1,
GrMipMapped::kNo, kTopLeft_GrSurfaceOrigin, nullptr, SkBudgeted::kYes)) {
topLeftRTC->clear(nullptr, SK_PMColor4fTRANSPARENT,
GrRenderTargetContext::CanClearFullscreen::kYes);
topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
rtc->drawTexture(GrNoClip(), sk_ref_sp(topLeftRTC->asTextureProxy()),
GrSamplerState::Filter::kNearest, 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 = ctx->priv().makeDeferredRenderTargetContext(
SkBackingFit::kExact, 100, 200, rtc->colorInfo().colorType(), nullptr, 1,
GrMipMapped::kNo, kBottomLeft_GrSurfaceOrigin, nullptr, SkBudgeted::kYes)) {
topLeftRTC->clear(nullptr, SK_PMColor4fTRANSPARENT,
GrRenderTargetContext::CanClearFullscreen::kYes);
topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, false, 0));
topLeftRTC->priv().testingOnly_addDrawOp(ClockwiseTestOp::Make(ctx, true, 100));
rtc->drawTexture(GrNoClip(), sk_ref_sp(topLeftRTC->asTextureProxy()),
GrSamplerState::Filter::kNearest, 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(); )
}
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