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skia2/gm/fwidth_squircle.cpp
Robert Phillips b58098f34c Add onPrePrepareDraws & createProgramInfo methods to GrDrawVerticesOp (take 2) 
This CL also incidentally adds:

1) a GrMeshDrawOp::Target 'outputView' virtual and switches GrOpFlushState over to overriding it.

2) a createProgramInfo helper to GrSimpleMeshDrawOpHelper

Bug: skia:9455
Change-Id: I88ce51c585b1458ee79a9aaa7024190e9f19198c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274506
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2020-03-03 13:48:41 +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/SkColor.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkString.h"
#include "include/gpu/GrContext.h"
#include "include/private/GrRecordingContext.h"
#include "include/private/GrTypesPriv.h"
#include "src/gpu/GrBuffer.h"
#include "src/gpu/GrCaps.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/GrShaderCaps.h"
#include "src/gpu/GrShaderVar.h"
#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
#include "src/gpu/glsl/GrGLSLPrimitiveProcessor.h"
#include "src/gpu/glsl/GrGLSLProgramDataManager.h"
#include "src/gpu/glsl/GrGLSLUniformHandler.h"
#include "src/gpu/glsl/GrGLSLVarying.h"
#include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
#include "src/gpu/ops/GrDrawOp.h"
#include "src/gpu/ops/GrOp.h"
#include "tools/gpu/ProxyUtils.h"
#include <memory>
#include <utility>
class GrAppliedClip;
/**
* This test ensures that fwidth() works properly on GPU configs by drawing a squircle.
*/
namespace skiagm {
static constexpr GrGeometryProcessor::Attribute gVertex =
{"bboxcoord", kFloat2_GrVertexAttribType, kFloat2_GrSLType};
////////////////////////////////////////////////////////////////////////////////////////////////////
// SkSL code.
class FwidthSquircleTestProcessor : public GrGeometryProcessor {
public:
static GrGeometryProcessor* Make(SkArenaAlloc* arena, const SkMatrix& viewMatrix) {
return arena->make<FwidthSquircleTestProcessor>(viewMatrix);
}
const char* name() const override { return "FwidthSquircleTestProcessor"; }
void getGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder* b) const final {}
GrGLSLPrimitiveProcessor* createGLSLInstance(const GrShaderCaps&) const final;
private:
friend class ::SkArenaAlloc; // for access to ctor
FwidthSquircleTestProcessor(const SkMatrix& viewMatrix)
: GrGeometryProcessor(kFwidthSquircleTestProcessor_ClassID)
, fViewMatrix(viewMatrix) {
this->setVertexAttributes(&gVertex, 1);
}
const SkMatrix fViewMatrix;
class Impl;
typedef GrGeometryProcessor INHERITED;
};
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 = half(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(half(.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,
const CoordTransformRange&) 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(GrRecordingContext* ctx, const SkMatrix& viewMatrix) {
GrOpMemoryPool* pool = ctx->priv().opMemoryPool();
return pool->allocate<FwidthSquircleTestOp>(viewMatrix);
}
private:
FwidthSquircleTestOp(const SkMatrix& viewMatrix)
: GrDrawOp(ClassID())
, fViewMatrix(viewMatrix) {
this->setBounds(SkRect::MakeIWH(kWidth, kHeight), HasAABloat::kNo, IsHairline::kNo);
}
const char* name() const override { return "FwidthSquircleTestOp"; }
FixedFunctionFlags fixedFunctionFlags() const override { return FixedFunctionFlags::kNone; }
GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*,
bool hasMixedSampledCoverage, GrClampType) override {
return GrProcessorSet::EmptySetAnalysis();
}
GrProgramInfo* createProgramInfo(const GrCaps* caps,
SkArenaAlloc* arena,
const GrSurfaceProxyView* outputView,
GrAppliedClip&& appliedClip,
const GrXferProcessor::DstProxyView& dstProxyView) const {
GrGeometryProcessor* geomProc = FwidthSquircleTestProcessor::Make(arena, fViewMatrix);
return sk_gpu_test::CreateProgramInfo(caps, arena, outputView,
std::move(appliedClip), dstProxyView,
geomProc, SkBlendMode::kSrcOver,
GrPrimitiveType::kTriangleStrip);
}
GrProgramInfo* createProgramInfo(GrOpFlushState* flushState) const {
return this->createProgramInfo(&flushState->caps(),
flushState->allocator(),
flushState->outputView(),
flushState->detachAppliedClip(),
flushState->dstProxyView());
}
void onPrePrepare(GrRecordingContext* context,
const GrSurfaceProxyView* outputView,
GrAppliedClip* clip,
const GrXferProcessor::DstProxyView& dstProxyView) final {
SkArenaAlloc* arena = context->priv().recordTimeAllocator();
// This is equivalent to a GrOpFlushState::detachAppliedClip
GrAppliedClip appliedClip = clip ? std::move(*clip) : GrAppliedClip();
fProgramInfo = this->createProgramInfo(context->priv().caps(), arena, outputView,
std::move(appliedClip), dstProxyView);
context->priv().recordProgramInfo(fProgramInfo);
}
void onPrepare(GrOpFlushState* flushState) final {
SkPoint vertices[4] = {
{-1, -1},
{+1, -1},
{-1, +1},
{+1, +1},
};
fVertexBuffer = flushState->resourceProvider()->createBuffer(
sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern, vertices);
}
void onExecute(GrOpFlushState* flushState, const SkRect& chainBounds) final {
if (!fVertexBuffer) {
return;
}
if (!fProgramInfo) {
fProgramInfo = this->createProgramInfo(flushState);
}
GrMesh mesh;
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(fVertexBuffer));
flushState->opsRenderPass()->bindPipeline(*fProgramInfo, SkRect::MakeIWH(kWidth, kHeight));
flushState->opsRenderPass()->drawMeshes(*fProgramInfo, &mesh, 1);
}
static const int kWidth = 200;
static const int kHeight = 200;
sk_sp<GrBuffer> fVertexBuffer;
const SkMatrix fViewMatrix;
// The program info (and both the GrPipeline and GrPrimitiveProcessor 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 GrPrimitiveProcessor pointers here bc they are
// guaranteed to have the same lifetime as the program info.
GrProgramInfo* fProgramInfo = nullptr;
friend class ::GrOpMemoryPool; // for ctor
typedef GrDrawOp INHERITED;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// Test.
DEF_SIMPLE_GPU_GM_CAN_FAIL(fwidth_squircle, ctx, rtc, canvas, errorMsg, 200, 200) {
if (!ctx->priv().caps()->shaderCaps()->shaderDerivativeSupport()) {
*errorMsg = "Shader derivatives not supported.";
return DrawResult::kSkip;
}
// Draw the test directly to the frame buffer.
canvas->clear(SK_ColorWHITE);
rtc->priv().testingOnly_addDrawOp(FwidthSquircleTestOp::Make(ctx, canvas->getTotalMatrix()));
return skiagm::DrawResult::kOk;
}
}
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