ColorCubeRT Class Reference

Inheritance diagram for ColorCubeRT:

Public Member Functions
	ColorCubeRT ()
void	onOnceBeforeDraw () override
void	onDraw (SkCanvas *canvas) override
Public Member Functions inherited from RuntimeShaderGM
	RuntimeShaderGM (const char *name, SkISize size, const char *sksl, uint32_t flags=0)
void	onOnceBeforeDraw () override
bool	runAsBench () const override
SkString	getName () const override
SkISize	getISize () override
bool	onAnimate (double nanos) override
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

Public Attributes
sk_sp< SkImage >	fMandrill
sk_sp< SkImage >	fMandrillSepia
sk_sp< SkImage >	fIdentityCube
sk_sp< SkImage >	fSepiaCube

Additional Inherited Members
Public Types inherited from skiagm::GM
enum	Mode { kGM_Mode , kSample_Mode , kBench_Mode }
using	DrawResult = skiagm::DrawResult
using	GraphiteTestContext = skiatest::graphite::GraphiteTestContext
Static Public Attributes inherited from skiagm::GM
static constexpr char	kErrorMsg_DrawSkippedGpuOnly []
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
Protected Attributes inherited from RuntimeShaderGM
SkString	fName
SkISize	fSize
uint32_t	fFlags
float	fSecs = 0.0f
SkString	fSkSL
sk_sp< SkRuntimeEffect >	fEffect

Detailed Description

Definition at line 270 of file runtimeshader.cpp.

Constructor & Destructor Documentation

ColorCubeRT()

ColorCubeRT::ColorCubeRT ( )

inline

Definition at line 272 of file runtimeshader.cpp.

                  : RuntimeShaderGM("color_cube_rt", {512, 512}, R"(
        uniform shader child;
        uniform shader color_cube;
 
        uniform float rg_scale;
        uniform float rg_bias;
        uniform float b_scale;
        uniform float inv_size;
 
        half4 main(float2 xy) {
            float4 c = unpremul(child.eval(xy));
 
            // Map to cube coords:
            float3 cubeCoords = float3(c.rg * rg_scale + rg_bias, c.b * b_scale);
 
            // Compute slice coordinate
            float2 coords1 = float2((floor(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g);
            float2 coords2 = float2(( ceil(cubeCoords.b) + cubeCoords.r) * inv_size, cubeCoords.g);
 
            // Two bilinear fetches, plus a manual lerp for the third axis:
            half4 color = mix(color_cube.eval(coords1), color_cube.eval(coords2),
                              fract(cubeCoords.b));
 
            // Premul again
            color.rgb *= color.a;
 
            return color;
        }
    )") {}

Member Function Documentation

onDraw()

void ColorCubeRT::onDraw ( SkCanvas *  canvas )

inlineoverridevirtual

Reimplemented from skiagm::GM.

Definition at line 313 of file runtimeshader.cpp.

                                           {
        SkRuntimeShaderBuilder builder(fEffect);
 
        // First we draw the unmodified image, and a copy that was sepia-toned in Photoshop:
        canvas->drawImage(fMandrill,      0,   0);
        canvas->drawImage(fMandrillSepia, 0, 256);
 
        // LUT dimensions should be (kSize^2, kSize)
        constexpr float kSize = 16.0f;
 
        const SkSamplingOptions sampling(SkFilterMode::kLinear);
 
        builder.uniform("rg_scale")     = (kSize - 1) / kSize;
        builder.uniform("rg_bias")      = 0.5f / kSize;
        builder.uniform("b_scale")      = kSize - 1;
        builder.uniform("inv_size")     = 1.0f / kSize;
 
        builder.child("child")        = fMandrill->makeShader(sampling);
 
        SkPaint paint;
 
        // TODO: Should we add SkImage::makeNormalizedShader() to handle this automatically?
        SkMatrix normalize = SkMatrix::Scale(1.0f / (kSize * kSize), 1.0f / kSize);
 
        // Now draw the image with an identity color cube - it should look like the original
        builder.child("color_cube") = fIdentityCube->makeShader(sampling, normalize);
        paint.setShader(builder.makeShader());
        canvas->translate(256, 0);
        canvas->drawRect({ 0, 0, 256, 256 }, paint);
 
        // ... and with a sepia-tone color cube. This should match the sepia-toned image.
        builder.child("color_cube") = fSepiaCube->makeShader(sampling, normalize);
        paint.setShader(builder.makeShader());
        canvas->translate(0, 256);
        canvas->drawRect({ 0, 0, 256, 256 }, paint);
    }

onOnceBeforeDraw()

void ColorCubeRT::onOnceBeforeDraw ( )

inlineoverridevirtual

Reimplemented from RuntimeShaderGM.

Definition at line 304 of file runtimeshader.cpp.

                                     {
        fMandrill = ToolUtils::GetResourceAsImage("images/mandrill_256.png");
        fMandrillSepia = ToolUtils::GetResourceAsImage("images/mandrill_sepia.png");
        fIdentityCube = ToolUtils::GetResourceAsImage("images/lut_identity.png");
        fSepiaCube = ToolUtils::GetResourceAsImage("images/lut_sepia.png");
 
        this->RuntimeShaderGM::onOnceBeforeDraw();
    }

Member Data Documentation

fIdentityCube

sk_sp<SkImage> ColorCubeRT::fIdentityCube

Definition at line 302 of file runtimeshader.cpp.

fMandrill

sk_sp<SkImage> ColorCubeRT::fMandrill

Definition at line 302 of file runtimeshader.cpp.

fMandrillSepia

sk_sp<SkImage> ColorCubeRT::fMandrillSepia

Definition at line 302 of file runtimeshader.cpp.

fSepiaCube

sk_sp<SkImage> ColorCubeRT::fSepiaCube

Definition at line 302 of file runtimeshader.cpp.

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

• third_party/skia/gm/runtimeshader.cpp