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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.h"
#include "sk_tool_utils.h"
#include "SkTextUtils.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrGpuCommandBuffer.h"
#include "GrMemoryPool.h"
#include "GrRenderTargetContext.h"
#include "GrRenderTargetContextPriv.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "glsl/GrGLSLGeometryProcessor.h"
#include "glsl/GrGLSLVarying.h"
#include "glsl/GrGLSLVertexGeoBuilder.h"
namespace skiagm {
static constexpr GrGeometryProcessor::Attribute gVertex =
{"bboxcoord", kFloat2_GrVertexAttribType, kFloat2_GrSLType};
/**
* This ensures that fwidth() works properly on GPU configs by drawing a squircle.
*/
class FwidthSquircleGM : public GM {
private:
SkString onShortName() final { return SkString("fwidth_squircle"); }
SkISize onISize() override { return SkISize::Make(200, 200); }
void onDraw(SkCanvas*) override;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// SkSL code.
class FwidthSquircleTestProcessor : public GrGeometryProcessor {
public:
FwidthSquircleTestProcessor(const SkMatrix& viewMatrix)
: GrGeometryProcessor(kFwidthSquircleTestProcessor_ClassID)
, fViewMatrix(viewMatrix) {
this->setVertexAttributes(&gVertex, 1);
}
const char* name() const override { return "FwidthSquircleTestProcessor"; }
void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {}
GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;
private:
const SkMatrix fViewMatrix;
class Impl;
};
class FwidthSquircleTestProcessor::Impl : public GrGLSLGeometryProcessor {
void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override {
const auto& proc = args.fGP.cast<FwidthSquircleTestProcessor>();
auto* uniforms = args.fUniformHandler;
fViewMatrixHandle =
uniforms->addUniform(kVertex_GrShaderFlag, kFloat3x3_GrSLType, "viewmatrix");
auto* varyings = args.fVaryingHandler;
varyings->emitAttributes(proc);
GrGLSLVarying squircleCoord(kFloat2_GrSLType);
varyings->addVarying("bboxcoord", &squircleCoord);
auto* v = args.fVertBuilder;
v->codeAppendf("float2x2 R = float2x2(cos(.05), sin(.05), -sin(.05), cos(.05));");
v->codeAppendf("%s = bboxcoord * 1.25;", squircleCoord.vsOut());
v->codeAppendf("float3 vertexpos = float3(bboxcoord * 100 * R + 100, 1);");
v->codeAppendf("vertexpos = %s * vertexpos;", uniforms->getUniformCStr(fViewMatrixHandle));
gpArgs->fPositionVar.set(kFloat3_GrSLType, "vertexpos");
auto* f = args.fFragBuilder;
f->codeAppendf("float golden_ratio = 1.61803398875;");
f->codeAppendf("float pi = 3.141592653589793;");
f->codeAppendf("float x = abs(%s.x), y = abs(%s.y);",
squircleCoord.fsIn(), squircleCoord.fsIn());
// Squircle function!
f->codeAppendf("float fn = pow(x, golden_ratio*pi) + pow(y, golden_ratio*pi) - 1;");
f->codeAppendf("float fnwidth = fwidth(fn);");
f->codeAppendf("fnwidth += 1e-10;"); // Guard against divide-by-zero.
f->codeAppendf("half coverage = clamp(.5 - fn/fnwidth, 0, 1);");
f->codeAppendf("%s = half4(.51, .42, .71, 1) * .89;", args.fOutputColor);
f->codeAppendf("%s = half4(coverage);", args.fOutputCoverage);
}
void setData(const GrGLSLProgramDataManager& pdman, const GrPrimitiveProcessor& primProc,
FPCoordTransformIter&& transformIter) override {
const auto& proc = primProc.cast<FwidthSquircleTestProcessor>();
pdman.setSkMatrix(fViewMatrixHandle, proc.fViewMatrix);
}
UniformHandle fViewMatrixHandle;
};
GrGLSLPrimitiveProcessor* FwidthSquircleTestProcessor::createGLSLInstance(
const GrShaderCaps&) const {
return new Impl();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Draw Op.
class FwidthSquircleTestOp : public GrDrawOp {
public:
DEFINE_OP_CLASS_ID
static std::unique_ptr<GrDrawOp> Make(GrContext* ctx, const SkMatrix& viewMatrix) {
GrOpMemoryPool* pool = ctx->contextPriv().opMemoryPool();
return pool->allocate<FwidthSquircleTestOp>(viewMatrix);
}
private:
FwidthSquircleTestOp(const SkMatrix& viewMatrix)
: GrDrawOp(ClassID())
, fViewMatrix(viewMatrix) {
this->setBounds(SkRect::MakeIWH(200, 200), HasAABloat::kNo, IsZeroArea::kNo);
}
const char* name() const override { return "ClockwiseTestOp"; }
FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
RequiresDstTexture finalize(const GrCaps&, const GrAppliedClip*) override {
return RequiresDstTexture::kNo;
}
void onPrepare(GrOpFlushState*) override {}
void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) override {
SkPoint vertices[4] = {
{-1, -1},
{+1, -1},
{-1, +1},
{+1, +1},
};
sk_sp<GrBuffer> vertexBuffer(flushState->resourceProvider()->createBuffer(
sizeof(vertices), kVertex_GrBufferType, kStatic_GrAccessPattern,
GrResourceProvider::Flags::kNone, vertices));
if (!vertexBuffer) {
return;
}
GrPipeline pipeline(flushState->drawOpArgs().fProxy, GrScissorTest::kDisabled,
SkBlendMode::kSrcOver);
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(vertexBuffer.get());
flushState->rtCommandBuffer()->draw(FwidthSquircleTestProcessor(fViewMatrix), pipeline,
nullptr, nullptr, &mesh, 1, SkRect::MakeIWH(100, 100));
}
const SkMatrix fViewMatrix;
friend class ::GrOpMemoryPool; // for ctor
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// Test.
void FwidthSquircleGM::onDraw(SkCanvas* canvas) {
GrContext* ctx = canvas->getGrContext();
GrRenderTargetContext* rtc = canvas->internal_private_accessTopLayerRenderTargetContext();
canvas->clear(SK_ColorWHITE);
if (!ctx || !rtc) {
DrawGpuOnlyMessage(canvas);
return;
}
if (!ctx->contextPriv().caps()->shaderCaps()->shaderDerivativeSupport()) {
SkFont font(sk_tool_utils::create_portable_typeface(), 15);
SkTextUtils::DrawString(canvas, "Shader derivatives not supported.", 150,
150 - 8, font, SkPaint(), SkTextUtils::kCenter_Align);
return;
}
// Draw the test directly to the frame buffer.
rtc->priv().testingOnly_addDrawOp(FwidthSquircleTestOp::Make(ctx, canvas->getTotalMatrix()));
}
DEF_GM( return new FwidthSquircleGM(); )
}
#endif // SK_SUPPORT_GPU
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