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skia2/gm/clockwise.cpp
Robert Phillips 67a625e51e Make GrProgramInfo take pointers to the GrPipeline and the GrPrimitiveProcessor 
Hopefully this makes it clearer that the GrProgramInfo isn't copying these
objects.

Bug: skia:9455
Change-Id: Id43b7978d63b6d53d531601f3446745f33afcf2d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254970
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2019-11-15 21:48:21 +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/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 <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:
static sk_sp<GrGeometryProcessor> Make(bool readSkFragCoord) {
return sk_sp<GrGeometryProcessor>(new 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;
private:
ClockwiseTestProcessor(bool readSkFragCoord)
: GrGeometryProcessor(kClockwiseTestProcessor_ClassID)
, fReadSkFragCoord(readSkFragCoord) {
this->setVertexAttributes(&gVertex, 1);
}
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 onPrePrepare(GrRecordingContext* context,
const GrSurfaceProxyView* dstView,
const GrAppliedClip*) final {
// We're going to create the GrProgramInfo (and the GrPipeline it relies on) in the
// DDL-record-time arena.
SkArenaAlloc* arena = context->priv().opPODAllocator();
// Not POD! It has some sk_sp's buried inside it!
GrPipeline* pipeline = arena->make<GrPipeline>(GrScissorTest::kDisabled, SkBlendMode::kPlus,
dstView->swizzle());
// This is allocated in the processor memory pool!?!
fGeomProc = ClockwiseTestProcessor::Make(fReadSkFragCoord);
// The programInfo is POD
GrRenderTargetProxy* dstProxy = dstView->asRenderTargetProxy();
fProgramInfo = arena->make<GrProgramInfo>(dstProxy->numSamples(),
dstProxy->numStencilSamples(),
dstView->origin(),
pipeline,
fGeomProc.get(),
nullptr, nullptr, 0,
GrPrimitiveType::kTriangleStrip);
}
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;
}
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(fVertexBuffer));
if (fProgramInfo) {
flushState->opsRenderPass()->draw(*fProgramInfo, &mesh, 1,
SkRect::MakeXYWH(0, fY, 100, 100));
} else {
const GrSurfaceProxyView* dstView = flushState->view();
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kPlus,
dstView->swizzle());
// This is allocated in the processor memory pool!?!
sk_sp<GrPrimitiveProcessor> gp = ClockwiseTestProcessor::Make(fReadSkFragCoord);
GrProgramInfo programInfo(dstView->asRenderTargetProxy()->numSamples(),
dstView->asRenderTargetProxy()->numStencilSamples(),
dstView->origin(),
&pipeline,
gp.get(),
nullptr, nullptr, 0,
GrPrimitiveType::kTriangleStrip);
flushState->opsRenderPass()->draw(programInfo, &mesh, 1,
SkRect::MakeXYWH(0, fY, 100, 100));
}
}
sk_sp<GrBuffer> fVertexBuffer;
const bool fReadSkFragCoord;
const float fY;
// This is allocated in the processor memory pool so we need to hold an sk_sp
sk_sp<GrPrimitiveProcessor> fGeomProc;
// The program info (and the GrPipeline it relies on), when allocated, are allocated in the
// ddl-record-time arena. It is the arena's job to free up their memory so we just have a
// bare program info pointer here. We don't even store the GrPipeline's pointer bc it is
// guaranteed to have the same lifetime as the program info.
GrProgramInfo* fProgramInfo = nullptr;
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.
GrColorType rtcColorType = rtc->colorInfo().colorType();
if (auto topLeftRTC = ctx->priv().makeDeferredRenderTargetContext(
SkBackingFit::kExact, 100, 200, rtcColorType, 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()), rtcColorType,
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, rtcColorType, 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()), rtcColorType,
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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