skgpu::graphite::CoverBoundsRenderStep Class Reference

#include <CoverBoundsRenderStep.h>

Inheritance diagram for skgpu::graphite::CoverBoundsRenderStep:

Public Member Functions
	CoverBoundsRenderStep (bool inverseFill)
	~CoverBoundsRenderStep () 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 15 of file CoverBoundsRenderStep.h.

Constructor & Destructor Documentation

CoverBoundsRenderStep()

skgpu::graphite::CoverBoundsRenderStep::CoverBoundsRenderStep

(

bool

inverseFill

)

Definition at line 17 of file CoverBoundsRenderStep.cpp.

        : RenderStep("CoverBoundsRenderStep",
                     inverseFill ? "inverse" : "regular",
                     Flags::kPerformsShading,
                     /*uniforms=*/{},
                     PrimitiveType::kTriangleStrip,
                     inverseFill ? kInverseCoverPass : kRegularCoverPass,
                     /*vertexAttrs=*/{{"position",
                                       VertexAttribType::kFloat4,
                                       SkSLType::kFloat4}},
                     /*instanceAttrs=*/{{"bounds", VertexAttribType::kFloat4, SkSLType::kFloat4},
                                        {"depth", VertexAttribType::kFloat, SkSLType::kFloat},
                                        {"ssboIndices", VertexAttribType::kUShort2, SkSLType::kUShort2},
                                        {"mat0", VertexAttribType::kFloat3, SkSLType::kFloat3},
                                        {"mat1", VertexAttribType::kFloat3, SkSLType::kFloat3},
                                        {"mat2", VertexAttribType::kFloat3, SkSLType::kFloat3}})
        , fInverseFill(inverseFill) {}

~CoverBoundsRenderStep()

skgpu::graphite::CoverBoundsRenderStep::~CoverBoundsRenderStep ( )

override

Definition at line 35 of file CoverBoundsRenderStep.cpp.

{}

Member Function Documentation

vertexSkSL()

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

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 37 of file CoverBoundsRenderStep.cpp.

                                                  {
    // Returns the body of a vertex function, which must define a float4 devPosition variable and
    // must write to an already-defined float2 stepLocalCoords variable.
    return "float4 devPosition = cover_bounds_vertex_fn("
                                         "float2(sk_VertexID / 2, sk_VertexID % 2), "
                                         "bounds, depth, float3x3(mat0, mat1, mat2), "
                                         "stepLocalCoords);\n";
}

writeUniformsAndTextures()

void skgpu::graphite::CoverBoundsRenderStep::writeUniformsAndTextures ( const DrawParams &  , PipelineDataGatherer *    ) const

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 74 of file CoverBoundsRenderStep.cpp.

                                                                                  {
    // All data is uploaded as instance attributes, so no uniforms are needed.
}

writeVertices()

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

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 46 of file CoverBoundsRenderStep.cpp.

                                                                         {
    // Each instance is 4 vertices, forming 2 triangles from a single triangle strip, so no indices
    // are needed. sk_VertexID is used to place vertex positions, so no vertex buffer is needed.
    DrawWriter::Instances instances{*writer, {}, {}, 4};
 
    skvx::float4 bounds;
    const SkM44* m;
    if (fInverseFill) {
        // Normally all bounding boxes are sorted such that l<r and t<b. We upload an inverted
        // rectangle [r,b,l,t] when it's an inverse fill to encode that the bounds are already in
        // device space and then use the inverse of the transform to compute local coordinates.
        bounds = skvx::shuffle</*R*/2, /*B*/3, /*L*/0, /*T*/1>(
                skvx::cast<float>(skvx::int4::Load(&params.clip().scissor())));
        m = &params.transform().inverse();
    } else {
        bounds = params.geometry().bounds().ltrb();
        m = &params.transform().matrix();
    }
 
    // Since the local coords always have Z=0, we can discard the 3rd row and column of the matrix.
    instances.append(1) << bounds << params.order().depthAsFloat() << ssboIndices
                        << m->rc(0,0) << m->rc(1,0) << m->rc(3,0)
                        << m->rc(0,1) << m->rc(1,1) << m->rc(3,1)
                        << m->rc(0,3) << m->rc(1,3) << m->rc(3,3);
}

---

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

• third_party/skia/src/gpu/graphite/render/CoverBoundsRenderStep.h
• third_party/skia/src/gpu/graphite/render/CoverBoundsRenderStep.cpp