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skia2/gm/clockwise.cpp
Chris Dalton 6ce447a4ec Eliminate mixed samples as an FBO type or AA type 
From now on, sample counts always refer to the number of actual color
samples, and render targets don't have separate color and stencil
sample counts.

If mixed samples support is available when making a
"GrAAType::kCoverage" draw, then an op may attach and use a mixed
sampled stencil buffer internally. But this will all be invisible to
the client.

After this CL, we temporarily won't have a mode to use nvpr with mixed
samples. That will soon be fixed by a follow-on CL that enables nvpr
with mixed samples in the normal "gl" and "gles" configs.

Bug: skia:
Change-Id: I1cb8277f0d2d0d371f24bb9f39cd473ed5c5c83b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221878
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2019-06-24 04:08:45 +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/GrSamplerState.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/GrGpuCommandBuffer.h"
#include "src/gpu/GrMemoryPool.h"
#include "src/gpu/GrMesh.h"
#include "src/gpu/GrOpFlushState.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/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 skiagm {
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 GpuGM {
private:
SkString onShortName() final { return SkString("clockwise"); }
SkISize onISize() override { return SkISize::Make(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*) override {}
void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override {
SkPoint vertices[4] = {
{100, fY},
{0, fY+100},
{0, fY},
{100, fY+100},
};
sk_sp<const GrBuffer> vertexBuffer(flushState->resourceProvider()->createBuffer(
sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern, vertices));
if (!vertexBuffer) {
return;
}
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kPlus,
flushState->drawOpArgs().fOutputSwizzle);
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(vertexBuffer));
flushState->rtCommandBuffer()->draw(ClockwiseTestProcessor(fReadSkFragCoord), pipeline,
nullptr, nullptr, &mesh, 1, SkRect::MakeIWH(100, 100));
}
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(
rtc->asSurfaceProxy()->backendFormat(), SkBackingFit::kExact, 100, 200,
rtc->asSurfaceProxy()->config(), 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(
rtc->asSurfaceProxy()->backendFormat(), SkBackingFit::kExact, 100, 200,
rtc->asSurfaceProxy()->config(), 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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