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skia2/gm/clockwise.cpp
Greg Daniel f793de1189 Update some ops to create their buffers in onPrepare. 
Need for a follow on change, we need all ops to do all their prep work
which includes creating needed buffers before we start calling
execute on ops. This change updates the few ops that were creating their
buffers in onExecute.

Change-Id: I0f43b0cc35359e1e7ccfb3b159e79bdfe288dcb1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239436
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
2019-09-05 19:43:11 +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::MakeIWH(300, 100), HasAABloat::kNo, IsZeroArea::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().fOutputSwizzle);
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(fVertexBuffer));
flushState->opsRenderPass()->draw(ClockwiseTestProcessor(fReadSkFragCoord), pipeline,
nullptr, nullptr, &mesh, 1, SkRect::MakeIWH(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->colorSpaceInfo().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->colorSpaceInfo().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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