skia2/gm/fwidth_squircle.cpp
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

177 lines
6.6 KiB
C++

/*
* 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/utils/SkTextUtils.h"
#include "tools/ToolUtils.h"
#if SK_SUPPORT_GPU
#include "include/gpu/GrContext.h"
#include "include/private/GrRecordingContext.h"
#include "src/gpu/GrContextPriv.h"
#include "src/gpu/GrGpuCommandBuffer.h"
#include "src/gpu/GrMemoryPool.h"
#include "src/gpu/GrOpFlushState.h"
#include "src/gpu/GrRecordingContextPriv.h"
#include "src/gpu/GrRenderTargetContext.h"
#include "src/gpu/GrRenderTargetContextPriv.h"
#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"
#include "src/gpu/glsl/GrGLSLGeometryProcessor.h"
#include "src/gpu/glsl/GrGLSLVarying.h"
#include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
/**
* 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:
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 = 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,
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(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(200, 200), 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*, GrFSAAType, GrClampType) override {
return GrProcessorSet::EmptySetAnalysis();
}
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<const GrBuffer> vertexBuffer(flushState->resourceProvider()->createBuffer(
sizeof(vertices), GrGpuBufferType::kVertex, kStatic_GrAccessPattern, vertices));
if (!vertexBuffer) {
return;
}
GrPipeline pipeline(GrScissorTest::kDisabled, SkBlendMode::kSrcOver);
GrMesh mesh(GrPrimitiveType::kTriangleStrip);
mesh.setNonIndexedNonInstanced(4);
mesh.setVertexData(std::move(vertexBuffer));
flushState->rtCommandBuffer()->draw(FwidthSquircleTestProcessor(fViewMatrix), pipeline,
nullptr, nullptr, &mesh, 1, SkRect::MakeIWH(100, 100));
}
const SkMatrix fViewMatrix;
friend class ::GrOpMemoryPool; // for ctor
};
////////////////////////////////////////////////////////////////////////////////////////////////////
// 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;
}
}
#endif // SK_SUPPORT_GPU