skiagm::MeshWithShadersGM Class Reference

Inheritance diagram for skiagm::MeshWithShadersGM:

Public Types
enum class	Type { kMeshWithImage , kMeshWithPaintColor , kMeshWithPaintImage , kMeshWithEffects }
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext

Public Member Functions
	MeshWithShadersGM (Type type)
Public Member Functions inherited from skiagm::GM
	GM (SkColor backgroundColor=SK_ColorWHITE)
virtual	~GM ()
void	setMode (Mode mode)
Mode	getMode () const
DrawResult	gpuSetup (SkCanvas *, SkString *errorMsg, GraphiteTestContext *=nullptr)
void	gpuTeardown ()
void	onceBeforeDraw ()
DrawResult	draw (SkCanvas *canvas)
DrawResult	draw (SkCanvas *, SkString *errorMsg)
void	drawBackground (SkCanvas *)
DrawResult	drawContent (SkCanvas *canvas)
DrawResult	drawContent (SkCanvas *, SkString *errorMsg)
virtual SkISize	getISize ()=0
virtual SkString	getName () const =0
virtual bool	runAsBench () const
SkScalar	width ()
SkScalar	height ()
SkColor	getBGColor () const
void	setBGColor (SkColor)
void	drawSizeBounds (SkCanvas *, SkColor)
bool	animate (double)
virtual bool	onChar (SkUnichar)
bool	getControls (SkMetaData *controls)
void	setControls (const SkMetaData &controls)
virtual void	modifyGrContextOptions (GrContextOptions *)
virtual void	modifyGraphiteContextOptions (skgpu::graphite::ContextOptions *) const
virtual bool	isBazelOnly () const
virtual std::map< std::string, std::string >	getGoldKeys () const

Protected Types
using	Attribute = SkMeshSpecification::Attribute
using	Varying = SkMeshSpecification::Varying

Protected Member Functions
SkISize	getISize () override
void	onOnceBeforeDraw () override
DrawResult	onGpuSetup (SkCanvas *canvas, SkString *string, GraphiteTestContext *) override
void	onGpuTeardown () override
SkString	getName () const override
bool	onAnimate (double nanos) override
DrawResult	onDraw (SkCanvas *canvas, SkString *) override
Protected Member Functions inherited from skiagm::GM
virtual DrawResult	onGpuSetup (SkCanvas *, SkString *, GraphiteTestContext *)
virtual void	onGpuTeardown ()
virtual void	onOnceBeforeDraw ()
virtual DrawResult	onDraw (SkCanvas *, SkString *errorMsg)
virtual void	onDraw (SkCanvas *)
virtual bool	onAnimate (double)
virtual bool	onGetControls (SkMetaData *)
virtual void	onSetControls (const SkMetaData &)
GraphiteTestContext *	graphiteTestContext () const

Additional Inherited Members
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []

Detailed Description

Definition at line 1232 of file mesh.cpp.

Member Typedef Documentation

Attribute

using skiagm::MeshWithShadersGM::Attribute = SkMeshSpecification::Attribute

protected

Definition at line 1267 of file mesh.cpp.

Varying

using skiagm::MeshWithShadersGM::Varying = SkMeshSpecification::Varying

protected

Definition at line 1268 of file mesh.cpp.

Member Enumeration Documentation

Type

enum class skiagm::MeshWithShadersGM::Type

strong

Enumerator
kMeshWithImage
kMeshWithPaintColor
kMeshWithPaintImage
kMeshWithEffects

Definition at line 1234 of file mesh.cpp.

                    {
        kMeshWithImage,
        kMeshWithPaintColor,
        kMeshWithPaintImage,
        kMeshWithEffects,
    };

Constructor & Destructor Documentation

MeshWithShadersGM()

skiagm::MeshWithShadersGM::MeshWithShadersGM ( Type  type )

inline

Definition at line 1241 of file mesh.cpp.

                                 : fType(type) {
        // Create a grid of evenly spaced points for our mesh
        this->onAnimate(0.0);
 
        // Create an index buffer of triangles over our point mesh.
        for (int y = 0; y < kMeshSize - 1; ++y) {
            for (int x = 0; x < kMeshSize - 1; ++x) {
                SkASSERT(((y + 1) * kMeshSize + x + 1) < fVerts.size());
 
                uint16_t TL =  y      * kMeshSize + x;
                uint16_t TR =  y      * kMeshSize + x + 1;
                uint16_t BL = (y + 1) * kMeshSize + x;
                uint16_t BR = (y + 1) * kMeshSize + x + 1;
 
                fIndices.push_back(TL);
                fIndices.push_back(TR);
                fIndices.push_back(BL);
 
                fIndices.push_back(BR);
                fIndices.push_back(BL);
                fIndices.push_back(TR);
            }
        }
    }

Member Function Documentation

getISize()

SkISize skiagm::MeshWithShadersGM::getISize ( )

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 1270 of file mesh.cpp.

{ return {320, 320}; }

getName()

SkString skiagm::MeshWithShadersGM::getName ( ) const

inlineoverrideprotectedvirtual

Implements skiagm::GM.

Definition at line 1395 of file mesh.cpp.

                                      {
        switch (fType) {
            case Type::kMeshWithImage:      return SkString("mesh_with_image");
            case Type::kMeshWithEffects:    return SkString("mesh_with_effects");
            case Type::kMeshWithPaintColor: return SkString("mesh_with_paint_color");
            case Type::kMeshWithPaintImage: return SkString("mesh_with_paint_image");
            default: SkUNREACHABLE;
        }
    }

onAnimate()

bool skiagm::MeshWithShadersGM::onAnimate ( double  nanos )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 1405 of file mesh.cpp.

                                          {
        // `periodic` goes from zero to 2π every four seconds, then wraps around.
        double periodic = nanos / 4'000'000'000.;
        periodic -= std::floor(periodic);
        periodic *= 2 * SK_DoublePI;
 
        double xOff[kMeshSize], yOff[kMeshSize];
        for (int index = 0; index < kMeshSize; ++index) {
            xOff[index] = std::sin(periodic) * kRippleSize;
            yOff[index] = std::sin(periodic + 10.0) * kRippleSize;
            periodic += 0.8;
        }
 
        fVerts.clear();
        for (int y = 0; y < kMeshSize; ++y) {
            float yf = (float)y / (kMeshSize - 1);  // yf = 0 .. 1
            for (int x = 0; x < kMeshSize; ++x) {
                float xf = (float)x / (kMeshSize - 1);  // xf = 0 .. 1
 
                Vertex* vert = &fVerts.push_back();
                vert->pos[0] = kRect.left() + xf * kRect.width()  + xOff[y];
                vert->pos[1] = kRect.top()  + yf * kRect.height() + yOff[x];
                vert->uv[0]  = kUV.left()   + xf * kUV.width();
                vert->uv[1]  = kUV.top()    + yf * kUV.height();
            }
        }
 
        return true;
    }

onDraw()

DrawResult skiagm::MeshWithShadersGM::onDraw ( SkCanvas *  canvas, SkString *    )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 1435 of file mesh.cpp.

                                                            {
        SkRuntimeEffect::ChildPtr child[4] = {fShader1, fShader2, fColorFilter, fBlender};
 
        GrRecordingContext* rc = canvas->recordingContext();
        GrDirectContext* dc = GrAsDirectContext(rc);
        fVB->update(dc, fVerts.data(), /*offset=*/0, fVerts.size_bytes());
 
        SkMesh::Result result = SkMesh::MakeIndexed(fSpec,
                                                    SkMesh::Mode::kTriangles,
                                                    fVB,
                                                    fVerts.size(),
                                                    /*vertexOffset=*/0,
                                                    fIB,
                                                    fIndices.size(),
                                                    /*indexOffset=*/0,
                                                    /*uniforms=*/nullptr,
                                                    /*children=*/child,
                                                    kRect.makeOutset(kRippleSize, kRippleSize));
        if (!result.mesh.isValid()) {
            SkDebugf("Mesh creation failed: %s\n", result.error.c_str());
            return DrawResult::kFail;
        }
 
        SkPaint paint;
        paint.setShader(fPaintShader);
        canvas->drawMesh(result.mesh, SkBlender::Mode(SkBlendMode::kDstOver), paint);
 
        return DrawResult::kOk;
    }

onGpuSetup()

DrawResult skiagm::MeshWithShadersGM::onGpuSetup ( SkCanvas *  canvas, SkString *  string, GraphiteTestContext *    )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 1375 of file mesh.cpp.

                                                                                             {
        auto dc = GrAsDirectContext(canvas->recordingContext());
        this->ensureBuffers();
        if (!dc || dc->abandoned()) {
            return DrawResult::kOk;
        }
 
        fVB = SkMeshes::CopyVertexBuffer(dc, fVB);
        fIB = SkMeshes::CopyIndexBuffer (dc, fIB);
        return (!fVB || !fIB) ? DrawResult::kFail
                              : DrawResult::kOk;
    }

onGpuTeardown()

void skiagm::MeshWithShadersGM::onGpuTeardown ( )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 1388 of file mesh.cpp.

                                  {
        // Destroy the GPU buffers and recreate on CPU
        fVB = nullptr;
        fIB = nullptr;
        this->ensureBuffers();
    }

onOnceBeforeDraw()

void skiagm::MeshWithShadersGM::onOnceBeforeDraw ( )

inlineoverrideprotectedvirtual

Reimplemented from skiagm::GM.

Definition at line 1272 of file mesh.cpp.

                                     {
        {
            static const Attribute kAttributes[] = {
                    {Attribute::Type::kFloat2, 0, SkString{"position"}},
                    {Attribute::Type::kFloat2, 8, SkString{"uv"}},
            };
            static const Varying kVaryings[] = {
                    {Varying::Type::kFloat2, SkString{"uv"}},
            };
            static constexpr char kVS[] = R"(
                    Varyings main(const in Attributes attributes) {
                        Varyings varyings;
                        varyings.uv       = attributes.uv;
                        varyings.position = attributes.position;
                        return varyings;
                    }
            )";
            static constexpr char kFS[] = R"(
                    uniform shader myShader1;
                    uniform shader myShader2;
                    uniform colorFilter myColorFilter;
                    uniform blender myBlend;
 
                    float2 main(const in Varyings varyings, out half4 color) {
                        half4 color1 = myShader1.eval(varyings.uv);
                        half4 color2 = myShader2.eval(varyings.uv);
 
                        // Apply a inverse color filter to the first image.
                        color1 = myColorFilter.eval(color1);
 
                        // Fade in the second image horizontally, leveraging the UVs.
                        color2 *= varyings.uv.x / 128.0;
 
                        // Combine the two images by using a blender (set to dst-over).
                        color = myBlend.eval(color1, color2);
 
                        return varyings.uv;
                    }
            )";
            auto [spec, error] = SkMeshSpecification::Make(kAttributes,
                                                           sizeof(Vertex),
                                                           kVaryings,
                                                           SkString(kVS),
                                                           SkString(kFS));
            if (!spec) {
                SkDebugf("%s\n", error.c_str());
            }
            fSpec = std::move(spec);
        }
 
 
        switch (fType) {
            case Type::kMeshWithImage: {
                fShader1 = ToolUtils::GetResourceAsImage("images/mandrill_128.png")
                                   ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                fShader2 = nullptr;
                fColorFilter = nullptr;
                fBlender = nullptr;
                fPaintShader = nullptr;
                break;
            }
            case Type::kMeshWithEffects: {
                uint8_t inverseTable[256];
                for (int index = 0; index < 256; ++index) {
                    inverseTable[index] = 255 - index;
                }
 
                fShader1 = ToolUtils::GetResourceAsImage("images/mandrill_128.png")
                                   ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                fShader2 = ToolUtils::GetResourceAsImage("images/color_wheel.png")
                                   ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                fColorFilter = SkColorFilters::TableARGB(/*tableA=*/nullptr,
                                                         inverseTable,
                                                         inverseTable,
                                                         inverseTable);
                fBlender = SkBlender::Mode(SkBlendMode::kDstOver);
                fPaintShader = nullptr;
                break;
            }
            case Type::kMeshWithPaintColor: {
                fShader1 = nullptr;
                fShader2 = ToolUtils::GetResourceAsImage("images/mandrill_128.png")
                                   ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                fColorFilter = nullptr;
                fBlender = SkBlender::Mode(SkBlendMode::kDst);
                fPaintShader = SkShaders::Color(SK_ColorGREEN);
                break;
            }
            case Type::kMeshWithPaintImage: {
                fShader1 = ToolUtils::GetResourceAsImage("images/color_wheel.png")
                                   ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                fShader2 = nullptr;
                fColorFilter = nullptr;
                fBlender = nullptr;
                fPaintShader = ToolUtils::GetResourceAsImage("images/mandrill_128.png")
                                       ->makeShader(SkSamplingOptions(SkFilterMode::kLinear));
                break;
            }
            default:
                SkUNREACHABLE;
        }
    }

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The documentation for this class was generated from the following file:

• third_party/skia/gm/mesh.cpp