#include <TessellateCurvesRenderStep.h>

Inheritance diagram for skgpu::graphite::TessellateCurvesRenderStep:

Public Member Functions
	TessellateCurvesRenderStep (bool evenOdd, bool infinitySupport, StaticBufferManager *bufferManager)

	~TessellateCurvesRenderStep () override

std::string	vertexSkSL () const override

void	writeVertices (DrawWriter *, const DrawParams &, skvx::ushort2 ssboIndices) const override

void	writeUniformsAndTextures (const DrawParams &, PipelineDataGatherer *) const override

Public Member Functions inherited from skgpu::graphite::RenderStep
virtual	~RenderStep ()=default

virtual std::string	texturesAndSamplersSkSL (const ResourceBindingRequirements &, int *nextBindingIndex) const

virtual const char *	fragmentCoverageSkSL () const

virtual const char *	fragmentColorSkSL () const

uint32_t	uniqueID () const

const char *	name () const

bool	requiresMSAA () const

bool	performsShading () const

bool	hasTextures () const

bool	emitsPrimitiveColor () const

bool	outsetBoundsForAA () const

Coverage	coverage () const

PrimitiveType	primitiveType () const

size_t	vertexStride () const

size_t	instanceStride () const

size_t	numUniforms () const

size_t	numVertexAttributes () const

size_t	numInstanceAttributes () const

SkSpan< const Uniform >	uniforms () const

SkSpan< const Attribute >	vertexAttributes () const

SkSpan< const Attribute >	instanceAttributes () const

SkSpan< const Varying >	varyings () const

const DepthStencilSettings &	depthStencilSettings () const

SkEnumBitMask< DepthStencilFlags >	depthStencilFlags () const

Additional Inherited Members
Static Public Member Functions inherited from skgpu::graphite::RenderStep
static const char *	ssboIndicesAttribute ()

static const char *	ssboIndicesVarying ()

Protected Types inherited from skgpu::graphite::RenderStep
enum class	Flags : unsigned { kNone = 0b0000000 , kRequiresMSAA = 0b0000001 , kPerformsShading = 0b0000010 , kHasTextures = 0b0000100 , kEmitsCoverage = 0b0001000 , kLCDCoverage = 0b0010000 , kEmitsPrimitiveColor = 0b0100000 , kOutsetBoundsForAA = 0b1000000 }

Protected Member Functions inherited from skgpu::graphite::RenderStep
	RenderStep (std::string_view className, std::string_view variantName, SkEnumBitMask< Flags > flags, std::initializer_list< Uniform > uniforms, PrimitiveType primitiveType, DepthStencilSettings depthStencilSettings, SkSpan< const Attribute > vertexAttrs, SkSpan< const Attribute > instanceAttrs, SkSpan< const Varying > varyings={})

Detailed Description

Definition at line 18 of file TessellateCurvesRenderStep.h.

Constructor & Destructor Documentation

◆ TessellateCurvesRenderStep()

skgpu::graphite::TessellateCurvesRenderStep::TessellateCurvesRenderStep	(	bool	evenOdd,
		bool	infinitySupport,
		StaticBufferManager *	bufferManager
	)

Definition at line 63 of file TessellateCurvesRenderStep.cpp.

        : RenderStep("TessellateCurvesRenderStep",
                     evenOdd ? "even-odd" : "winding",
                     Flags::kRequiresMSAA,
                     /*uniforms=*/{{"localToDevice", SkSLType::kFloat4x4}},
                     PrimitiveType::kTriangles,
                     evenOdd ? kEvenOddStencilPass : kWindingStencilPass,
                     /*vertexAttrs=*/  {{"resolveLevel_and_idx",
                                         VertexAttribType::kFloat2, SkSLType::kFloat2}},
                     /*instanceAttrs=*/kAttributes[infinitySupport])
        , fInfinitySupport(infinitySupport) {
    SkASSERT(this->instanceStride() ==
             PatchStride(infinitySupport ? kAttribs : kAttribsWithCurveType));
 
    // Initialize the static buffers we'll use when recording draw calls.
    // NOTE: Each instance of this RenderStep gets its own copy of the data. If this ends up causing
    // problems, we can modify StaticBufferManager to de-duplicate requests.
    const size_t vertexSize = FixedCountCurves::VertexBufferSize();
    auto vertexData = bufferManager->getVertexWriter(vertexSize, &fVertexBuffer);
    if (vertexData) {
        FixedCountCurves::WriteVertexBuffer(std::move(vertexData), vertexSize);
    } // otherwise static buffer creation failed, so do nothing; Context initialization will fail.
 
    const size_t indexSize = FixedCountCurves::IndexBufferSize();
    auto indexData = bufferManager->getIndexWriter(indexSize, &fIndexBuffer);
    if (indexData) {
        FixedCountCurves::WriteIndexBuffer(std::move(indexData), indexSize);
    } // ""
}

◆ ~TessellateCurvesRenderStep()

skgpu::graphite::TessellateCurvesRenderStep::~TessellateCurvesRenderStep ( )

override

Definition at line 95 of file TessellateCurvesRenderStep.cpp.

95{}

Member Function Documentation

◆ vertexSkSL()

std::string skgpu::graphite::TessellateCurvesRenderStep::vertexSkSL ( ) const

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 97 of file TessellateCurvesRenderStep.cpp.

                                                       {
    return SkSL::String::printf(
            R"(
                // TODO: Approximate perspective scaling to match how PatchWriter is configured (or
                // provide explicit tessellation level in instance data instead of replicating

◆ writeUniformsAndTextures()

void skgpu::graphite::TessellateCurvesRenderStep::writeUniformsAndTextures	(	const DrawParams &	params,
		PipelineDataGatherer *	gatherer
	)		const

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 142 of file TessellateCurvesRenderStep.cpp.

                             : SkPathPriv::Iterate(path)) {
        switch (verb) {
            case SkPathVerb::kQuad:  writer.writeQuadratic(pts); break;
            case SkPathVerb::kConic: writer.writeConic(pts, *w); break;
            case SkPathVerb::kCubic: writer.writeCubic(pts);     break;
            default:                                             break;

◆ writeVertices()

void skgpu::graphite::TessellateCurvesRenderStep::writeVertices	(	DrawWriter *	dw,
		const DrawParams &	params,
		skvx::ushort2	ssboIndices
	)		const

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 103 of file TessellateCurvesRenderStep.cpp.

                                                                   : "curveType");
}
 
void TessellateCurvesRenderStep::writeVertices(DrawWriter* dw,
                                               const DrawParams& params,
                                               skvx::ushort2 ssboIndices) const {
    SkPath path = params.geometry().shape().asPath(); // TODO: Iterate the Shape directly
 
    int patchReserveCount = FixedCountCurves::PreallocCount(path.countVerbs());
    Writer writer{fInfinitySupport ? kAttribs : kAttribsWithCurveType,
                  *dw,
                  fVertexBuffer,
                  fIndexBuffer,
                  patchReserveCount};
    writer.updatePaintDepthAttrib(params.order().depthAsFloat());
    writer.updateSsboIndexAttrib(ssboIndices);
 
    // The vector xform approximates how the control points are transformed by the shader to
    // more accurately compute how many *parametric* segments are needed.
    // TODO: This doesn't account for perspective division yet, which will require updating the
    // approximate transform based on each verb's control points' bounding box.
    SkASSERT(params.transform().type() < Transform::Type::kPerspective);
    writer.setShaderTransform(wangs_formula::VectorXform{params.transform().matrix()},
                              params.transform().maxScaleFactor());
 
    // TODO: For filled curves, the path verb loop is simple enough that it's not too big a deal
    // to copy the logic from PathCurveTessellator::write_patches. It may be required if we end
    // up switching to a shape iterator in graphite vs. a path iterator in ganesh, or if
    // graphite does not control point transformation on the CPU. On the  other hand, if we
    // provide a templated WritePatches function, the iterator could also be a template arg in
    // addition to PatchWriter's traits. Whatever pattern we choose will be based more on what's

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

third_party/skia/src/gpu/graphite/render/TessellateCurvesRenderStep.h
third_party/skia/src/gpu/graphite/render/TessellateCurvesRenderStep.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ TessellateCurvesRenderStep()

◆ ~TessellateCurvesRenderStep()

Member Function Documentation

◆ vertexSkSL()

◆ writeUniformsAndTextures()

◆ writeVertices()