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skia2/gm/clockwise.cpp
Brian Salomon 6927ab9311 Add support for explicit attribute offsets and strides. 
Previously attribute offsets were always computed based on their
position in an attribute array and the stride was determined
by the offset and size of the last attribute.

Now a GP has the option to create attributes with explicit offsets
and specify an explicit vertex stride. All attributes must either
be implicit or explicit (enforced by assert).

GrGeometryProcessor::AttributeSet is now responsible for handling
implicitly determined attribute offsets and strides. The backends
no longer compute them.

Bug: skia:12720
Change-Id: I0211673dc70d4797c2d66b2555d8f5fb430be056
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/484736
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2021-12-16 14:38:12 +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/GrRecordingContext.h"
#include "include/gpu/GrTypes.h"
#include "include/private/GrTypesPriv.h"
#include "include/private/SkColorData.h"
#include "src/core/SkCanvasPriv.h"
#include "src/gpu/GrBuffer.h"
#include "src/gpu/GrCaps.h"
#include "src/gpu/GrColorSpaceXform.h"
#include "src/gpu/GrDirectContextPriv.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/GrProcessor.h"
#include "src/gpu/GrProcessorSet.h"
#include "src/gpu/GrProgramInfo.h"
#include "src/gpu/GrRecordingContextPriv.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/GrGLSLVarying.h"
#include "src/gpu/ops/GrDrawOp.h"
#include "src/gpu/ops/GrOp.h"
#include "src/gpu/v1/SurfaceDrawContext_v1.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};
////////////////////////////////////////////////////////////////////////////////////////////////////
// SkSL code.
class ClockwiseTestProcessor : public GrGeometryProcessor {
public:
static GrGeometryProcessor* Make(SkArenaAlloc* arena, bool readSkFragCoord) {
return arena->make([&](void* ptr) {
return new (ptr) ClockwiseTestProcessor(readSkFragCoord);
});
}
const char* name() const final { return "ClockwiseTestProcessor"; }
void addToKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {
b->add32(fReadSkFragCoord);
}
std::unique_ptr<ProgramImpl> makeProgramImpl(const GrShaderCaps&) const final;
bool readSkFragCoord() const { return fReadSkFragCoord; }
private:
ClockwiseTestProcessor(bool readSkFragCoord)
: GrGeometryProcessor(kClockwiseTestProcessor_ClassID)
, fReadSkFragCoord(readSkFragCoord) {
this->setVertexAttributesWithImplicitOffsets(&gVertex, 1);
}
const bool fReadSkFragCoord;
using INHERITED = GrGeometryProcessor;
};
std::unique_ptr<GrGeometryProcessor::ProgramImpl> ClockwiseTestProcessor::makeProgramImpl(
const GrShaderCaps&) const {
class Impl : public ProgramImpl {
public:
void setData(const GrGLSLProgramDataManager&,
const GrShaderCaps&,
const GrGeometryProcessor&) override {}
private:
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const ClockwiseTestProcessor& proc = args.fGeomProc.cast<ClockwiseTestProcessor>();
args.fVaryingHandler->emitAttributes(proc);
gpArgs->fPositionVar.set(kFloat2_GrSLType, "position");
args.fFragBuilder->codeAppendf(
"half4 %s = sk_Clockwise ? half4(0,1,0,1) : half4(1,0,0,1);",
args.fOutputColor);
if (!proc.readSkFragCoord()) {
args.fFragBuilder->codeAppendf("const half4 %s = half4(1);", args.fOutputCoverage);
} else {
// Verify layout(origin_upper_left) on gl_FragCoord does not affect gl_FrontFacing.
args.fFragBuilder->codeAppendf("half4 %s = half4(min(half(sk_FragCoord.y), 1));",
args.fOutputCoverage);
}
}
};
return std::make_unique<Impl>();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Draw Op.
class ClockwiseTestOp : public GrDrawOp {
public:
DEFINE_OP_CLASS_ID
static GrOp::Owner Make(GrRecordingContext* context,
bool readSkFragCoord, int y = 0) {
return GrOp::Make<ClockwiseTestOp>(context, 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*, GrClampType) override {
return GrProcessorSet::EmptySetAnalysis();
}
GrProgramInfo* createProgramInfo(const GrCaps* caps,
SkArenaAlloc* arena,
const GrSurfaceProxyView& writeView,
bool usesMSAASurface,
GrAppliedClip&& appliedClip,
const GrDstProxyView& dstProxyView,
GrXferBarrierFlags renderPassXferBarriers,
GrLoadOp colorLoadOp) const {
GrGeometryProcessor* geomProc = ClockwiseTestProcessor::Make(arena, fReadSkFragCoord);
return sk_gpu_test::CreateProgramInfo(caps, arena, writeView, usesMSAASurface,
std::move(appliedClip), dstProxyView,
geomProc, SkBlendMode::kPlus,
GrPrimitiveType::kTriangleStrip,
renderPassXferBarriers, colorLoadOp);
}
GrProgramInfo* createProgramInfo(GrOpFlushState* flushState) const {
return this->createProgramInfo(&flushState->caps(),
flushState->allocator(),
flushState->writeView(),
flushState->usesMSAASurface(),
flushState->detachAppliedClip(),
flushState->dstProxyView(),
flushState->renderPassBarriers(),
flushState->colorLoadOp());
}
void onPrePrepare(GrRecordingContext* context,
const GrSurfaceProxyView& writeView,
GrAppliedClip* clip,
const GrDstProxyView& dstProxyView,
GrXferBarrierFlags renderPassXferBarriers,
GrLoadOp colorLoadOp) final {
SkArenaAlloc* arena = context->priv().recordTimeAllocator();
// DMSAA is not supported on DDL.
bool usesMSAASurface = writeView.asRenderTargetProxy()->numSamples() > 1;
// This is equivalent to a GrOpFlushState::detachAppliedClip
GrAppliedClip appliedClip = clip ? std::move(*clip) : GrAppliedClip::Disabled();
fProgramInfo = this->createProgramInfo(context->priv().caps(), arena, writeView,
usesMSAASurface, std::move(appliedClip),
dstProxyView, renderPassXferBarriers, colorLoadOp);
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 GrGeometryProcessor 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 GrGeometryProcessor pointers here bc they are
// guaranteed to have the same lifetime as the program info.
GrProgramInfo* fProgramInfo = nullptr;
friend class ::GrOp; // for ctor
using INHERITED = GrDrawOp;
};
} // namespace
////////////////////////////////////////////////////////////////////////////////////////////////////
// Test.
namespace skiagm {
/**
* 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 GpuGM {
SkString onShortName() override { return SkString("clockwise"); }
SkISize onISize() override { return {300, 200}; }
DrawResult onDraw(GrRecordingContext*, SkCanvas*, SkString* errorMsg) override;
};
DrawResult ClockwiseGM::onDraw(GrRecordingContext* rContext, SkCanvas* canvas, SkString* errorMsg) {
auto sdc = SkCanvasPriv::TopDeviceSurfaceDrawContext(canvas);
if (!sdc) {
*errorMsg = kErrorMsg_DrawSkippedGpuOnly;
return DrawResult::kSkip;
}
sdc->clear(SK_PMColor4fBLACK);
// Draw the test directly to the frame buffer.
sdc->addDrawOp(ClockwiseTestOp::Make(rContext, false, 0));
sdc->addDrawOp(ClockwiseTestOp::Make(rContext, true, 100));
// Draw the test to an off-screen, top-down render target.
GrColorType sdcColorType = sdc->colorInfo().colorType();
if (auto topLeftSDC = skgpu::v1::SurfaceDrawContext::Make(
rContext, sdcColorType, nullptr, SkBackingFit::kExact, {100, 200}, SkSurfaceProps(),
1, GrMipmapped::kNo, GrProtected::kNo, kTopLeft_GrSurfaceOrigin,
SkBudgeted::kYes)) {
topLeftSDC->clear(SK_PMColor4fTRANSPARENT);
topLeftSDC->addDrawOp(ClockwiseTestOp::Make(rContext, false, 0));
topLeftSDC->addDrawOp(ClockwiseTestOp::Make(rContext, true, 100));
sdc->drawTexture(nullptr,
topLeftSDC->readSurfaceView(),
sdc->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 topLeftSDC = skgpu::v1::SurfaceDrawContext::Make(
rContext, sdcColorType, nullptr, SkBackingFit::kExact, {100, 200}, SkSurfaceProps(),
1, GrMipmapped::kNo, GrProtected::kNo, kBottomLeft_GrSurfaceOrigin,
SkBudgeted::kYes)) {
topLeftSDC->clear(SK_PMColor4fTRANSPARENT);
topLeftSDC->addDrawOp(ClockwiseTestOp::Make(rContext, false, 0));
topLeftSDC->addDrawOp(ClockwiseTestOp::Make(rContext, true, 100));
sdc->drawTexture(nullptr,
topLeftSDC->readSurfaceView(),
sdc->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);
}
return DrawResult::kOk;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
DEF_GM( return new ClockwiseGM(); )
} // namespace skiagm
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