2018-11-13 20:07:24 +00:00
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/*
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* Copyright 2018 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "sk_tool_utils.h"
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#include "SkTextUtils.h"
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#if SK_SUPPORT_GPU
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#include "GrContext.h"
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#include "GrGpuCommandBuffer.h"
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#include "GrMemoryPool.h"
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#include "GrRenderTargetContext.h"
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#include "GrRenderTargetContextPriv.h"
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#include "glsl/GrGLSLFragmentShaderBuilder.h"
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#include "glsl/GrGLSLGeometryProcessor.h"
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#include "glsl/GrGLSLVarying.h"
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#include "glsl/GrGLSLVertexGeoBuilder.h"
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namespace skiagm {
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static constexpr GrGeometryProcessor::Attribute gVertex =
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{"bboxcoord", kFloat2_GrVertexAttribType, kFloat2_GrSLType};
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/**
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* This ensures that fwidth() works properly on GPU configs by drawing a squircle.
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*/
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class FwidthSquircleGM : public GM {
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private:
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SkString onShortName() final { return SkString("fwidth_squircle"); }
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SkISize onISize() override { return SkISize::Make(200, 200); }
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void onDraw(SkCanvas*) override;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// SkSL code.
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class FwidthSquircleTestProcessor : public GrGeometryProcessor {
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public:
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FwidthSquircleTestProcessor(const SkMatrix& viewMatrix)
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: GrGeometryProcessor(kFwidthSquircleTestProcessor_ClassID)
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, fViewMatrix(viewMatrix) {
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this->setVertexAttributes(&gVertex, 1);
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}
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const char* name() const override { return "FwidthSquircleTestProcessor"; }
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void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {}
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GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;
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private:
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const SkMatrix fViewMatrix;
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class Impl;
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};
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class FwidthSquircleTestProcessor::Impl : public GrGLSLGeometryProcessor {
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void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
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const auto& proc = args.fGP.cast<FwidthSquircleTestProcessor>();
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auto* uniforms = args.fUniformHandler;
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fViewMatrixHandle =
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uniforms->addUniform(kVertex_GrShaderFlag, kFloat3x3_GrSLType, "viewmatrix");
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auto* varyings = args.fVaryingHandler;
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varyings->emitAttributes(proc);
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GrGLSLVarying squircleCoord(kFloat2_GrSLType);
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varyings->addVarying("bboxcoord", &squircleCoord);
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auto* v = args.fVertBuilder;
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v->codeAppendf("float2x2 R = float2x2(cos(.05), sin(.05), -sin(.05), cos(.05));");
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v->codeAppendf("%s = bboxcoord * 1.25;", squircleCoord.vsOut());
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v->codeAppendf("float3 vertexpos = float3(bboxcoord * 100 * R + 100, 1);");
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v->codeAppendf("vertexpos = %s * vertexpos;", uniforms->getUniformCStr(fViewMatrixHandle));
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gpArgs->fPositionVar.set(kFloat3_GrSLType, "vertexpos");
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auto* f = args.fFragBuilder;
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f->codeAppendf("float golden_ratio = 1.61803398875;");
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f->codeAppendf("float pi = 3.141592653589793;");
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f->codeAppendf("float x = abs(%s.x), y = abs(%s.y);",
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squircleCoord.fsIn(), squircleCoord.fsIn());
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// Squircle function!
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f->codeAppendf("float fn = pow(x, golden_ratio*pi) + pow(y, golden_ratio*pi) - 1;");
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f->codeAppendf("float fnwidth = fwidth(fn);");
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f->codeAppendf("fnwidth += 1e-10;"); // Guard against divide-by-zero.
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f->codeAppendf("half coverage = clamp(.5 - fn/fnwidth, 0, 1);");
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f->codeAppendf("%s = half4(.51, .42, .71, 1) * .89;", args.fOutputColor);
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f->codeAppendf("%s = half4(coverage);", args.fOutputCoverage);
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}
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void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& primProc,
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FPCoordTransformIter&& transformIter) override {
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const auto& proc = primProc.cast<FwidthSquircleTestProcessor>();
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pdman.setSkMatrix(fViewMatrixHandle, proc.fViewMatrix);
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}
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UniformHandle fViewMatrixHandle;
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};
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GrGLSLPrimitiveProcessor* FwidthSquircleTestProcessor::createGLSLInstance(
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const GrShaderCaps&) const {
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return new Impl();
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Draw Op.
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class FwidthSquircleTestOp : public GrDrawOp {
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public:
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DEFINE_OP_CLASS_ID
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static std::unique_ptr<GrDrawOp> Make(GrContext* ctx, const SkMatrix& viewMatrix) {
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2019-02-04 18:26:26 +00:00
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GrOpMemoryPool* pool = ctx->priv().opMemoryPool();
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2018-11-13 20:07:24 +00:00
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return pool->allocate<FwidthSquircleTestOp>(viewMatrix);
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}
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private:
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FwidthSquircleTestOp(const SkMatrix& viewMatrix)
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: GrDrawOp(ClassID())
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, fViewMatrix(viewMatrix) {
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this->setBounds(SkRect::MakeIWH(200, 200), HasAABloat::kNo, IsZeroArea::kNo);
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}
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const char* name() const override { return "ClockwiseTestOp"; }
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FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
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2019-01-15 18:53:00 +00:00
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GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*) override {
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return GrProcessorSet::EmptySetAnalysis();
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2018-11-13 20:07:24 +00:00
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}
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void onPrepare(GrOpFlushState*) override {}
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2018-11-14 18:56:37 +00:00
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void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override {
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2018-11-13 20:07:24 +00:00
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SkPoint vertices[4] = {
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{-1, -1},
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{+1, -1},
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{-1, +1},
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{+1, +1},
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};
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2019-01-29 19:38:50 +00:00
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sk_sp<const GrBuffer> vertexBuffer(flushState->resourceProvider()->createBuffer(
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2019-02-05 14:41:37 +00:00
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sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern,
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2018-11-13 20:07:24 +00:00
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GrResourceProvider::Flags::kNone, vertices));
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if (!vertexBuffer) {
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return;
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}
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2019-01-31 19:13:59 +00:00
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GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kSrcOver);
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2018-11-13 20:07:24 +00:00
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GrMesh mesh(GrPrimitiveType::kTriangleStrip);
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mesh.setNonIndexedNonInstanced(4);
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2019-01-29 19:38:50 +00:00
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mesh.setVertexData(std::move(vertexBuffer));
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2018-11-13 20:07:24 +00:00
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flushState->rtCommandBuffer()->draw(FwidthSquircleTestProcessor(fViewMatrix), pipeline,
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nullptr, nullptr, &mesh, 1, SkRect::MakeIWH(100, 100));
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}
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const SkMatrix fViewMatrix;
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friend class ::GrOpMemoryPool; // for ctor
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Test.
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void FwidthSquircleGM::onDraw(SkCanvas* canvas) {
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GrContext* ctx = canvas->getGrContext();
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GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
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canvas->clear(SK_ColorWHITE);
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if (!ctx || !rtc) {
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DrawGpuOnlyMessage(canvas);
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return;
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}
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2019-02-04 18:26:26 +00:00
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if (!ctx->priv().caps()->shaderCaps()->shaderDerivativeSupport()) {
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2018-12-24 04:19:14 +00:00
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SkFont font(sk_tool_utils::create_portable_typeface(), 15);
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2019-02-04 08:20:52 +00:00
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DrawFailureMessage(canvas, "Shader derivatives not supported.");
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2018-11-13 20:07:24 +00:00
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return;
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}
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// Draw the test directly to the frame buffer.
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rtc->priv().testingOnly_addDrawOp(FwidthSquircleTestOp::Make(ctx, canvas->getTotalMatrix()));
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}
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DEF_GM( return new FwidthSquircleGM(); )
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}
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#endif // SK_SUPPORT_GPU
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