#include <PerEdgeAAQuadRenderStep.h>

Inheritance diagram for skgpu::graphite::PerEdgeAAQuadRenderStep:

Public Member Functions
	PerEdgeAAQuadRenderStep (StaticBufferManager *bufferManager)

	~PerEdgeAAQuadRenderStep () override

std::string	vertexSkSL () const override

const char *	fragmentCoverageSkSL () 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 *	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 17 of file PerEdgeAAQuadRenderStep.h.

Constructor & Destructor Documentation

◆ PerEdgeAAQuadRenderStep()

skgpu::graphite::PerEdgeAAQuadRenderStep::PerEdgeAAQuadRenderStep ( StaticBufferManager * bufferManager )

Definition at line 178 of file PerEdgeAAQuadRenderStep.cpp.

        : RenderStep("PerEdgeAAQuadRenderStep",
                     "",
                     Flags::kPerformsShading | Flags::kEmitsCoverage | Flags::kOutsetBoundsForAA,
                     /*uniforms=*/{},
                     PrimitiveType::kTriangleStrip,
                     kDirectDepthGreaterPass,
                     /*vertexAttrs=*/{
                            {"normal", VertexAttribType::kFloat2, SkSLType::kFloat2},
                     },
                     /*instanceAttrs=*/
                            {{"edgeFlags", VertexAttribType::kUByte4_norm, SkSLType::kFloat4},
                             {"quadXs", VertexAttribType::kFloat4, SkSLType::kFloat4},
                             {"quadYs", VertexAttribType::kFloat4, SkSLType::kFloat4},
 
                             // TODO: pack depth and ssbo index into one 32-bit attribute, if we can
                             // go without needing both render step and paint ssbo index attributes.
                             {"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}},
                     /*varyings=*/{
                             // Device-space distance to LTRB edges of quad.
                             {"edgeDistances", SkSLType::kFloat4}, // distance to LTRB edges
                     }) {
    // Initialize the static buffers we'll use when recording draw calls.
    // NOTE: Each instance of this RenderStep gets its own copy of the data. Since there should only
    // ever be one PerEdgeAAQuadRenderStep at a time, this shouldn't be an issue.
    write_vertex_buffer(bufferManager->getVertexWriter(sizeof(Vertex) * kVertexCount,
                                                       &fVertexBuffer));
    write_index_buffer(bufferManager->getIndexWriter(sizeof(uint16_t) * kIndexCount,
                                                     &fIndexBuffer));
}

◆ ~PerEdgeAAQuadRenderStep()

skgpu::graphite::PerEdgeAAQuadRenderStep::~PerEdgeAAQuadRenderStep ( )

override

Definition at line 214 of file PerEdgeAAQuadRenderStep.cpp.

214{}

Member Function Documentation

◆ fragmentCoverageSkSL()

const char * skgpu::graphite::PerEdgeAAQuadRenderStep::fragmentCoverageSkSL ( ) const

overridevirtual

Reimplemented from skgpu::graphite::RenderStep.

Definition at line 231 of file PerEdgeAAQuadRenderStep.cpp.

                                                                {
    // The returned SkSL must write its coverage into a 'half4 outputCoverage' variable (defined in
    // the calling code) with the actual coverage splatted out into all four channels.
    return "outputCoverage = per_edge_aa_quad_coverage_fn(sk_FragCoord, edgeDistances);";
}

◆ vertexSkSL()

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

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 216 of file PerEdgeAAQuadRenderStep.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 = per_edge_aa_quad_vertex_fn("
                   // Vertex Attributes
                   "normal, "
                   // Instance Attributes
                   "edgeFlags, quadXs, quadYs, depth, "
                   "float3x3(mat0, mat1, mat2), "
                   // Varyings
                   "edgeDistances, "
                   // Render Step
                   "stepLocalCoords);\n";
}

◆ writeUniformsAndTextures()

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

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 277 of file PerEdgeAAQuadRenderStep.cpp.

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

◆ writeVertices()

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

overridevirtual

Implements skgpu::graphite::RenderStep.

Definition at line 237 of file PerEdgeAAQuadRenderStep.cpp.

                                                                          {
    SkASSERT(params.geometry().isEdgeAAQuad());
    const EdgeAAQuad& quad = params.geometry().edgeAAQuad();
 
    DrawWriter::Instances instance{*writer, fVertexBuffer, fIndexBuffer, kIndexCount};
    auto vw = instance.append(1);
 
    // Empty fills should not have been recorded at all.
    SkDEBUGCODE(Rect bounds = params.geometry().bounds());
    SkASSERT(!bounds.isEmptyNegativeOrNaN());
 
    constexpr uint8_t kAAOn = 255;
    constexpr uint8_t kAAOff = 0;
    auto edgeSigns = skvx::byte4{quad.edgeFlags() & AAFlags::kLeft   ? kAAOn : kAAOff,
                                 quad.edgeFlags() & AAFlags::kTop    ? kAAOn : kAAOff,
                                 quad.edgeFlags() & AAFlags::kRight  ? kAAOn : kAAOff,
                                 quad.edgeFlags() & AAFlags::kBottom ? kAAOn : kAAOff};
 
    // The vertex shader expects points to be in clockwise order. EdgeAAQuad is the only
    // shape that *might* have counter-clockwise input.
    if (is_clockwise(quad)) {
        vw << edgeSigns << quad.xs() << quad.ys();
    } else {
        vw << skvx::shuffle<2,1,0,3>(edgeSigns)  // swap left and right AA bits
           << skvx::shuffle<1,0,3,2>(quad.xs())  // swap TL with TR, and BL with BR
           << skvx::shuffle<1,0,3,2>(quad.ys()); //   ""
    }
 
    // All instance types share the remaining instance attribute definitions
    const SkM44& m = params.transform().matrix();
 
    vw << params.order().depthAsFloat()
       << ssboIndices
       << m.rc(0,0) << m.rc(1,0) << m.rc(3,0)  // mat0
       << m.rc(0,1) << m.rc(1,1) << m.rc(3,1)  // mat1
       << m.rc(0,3) << m.rc(1,3) << m.rc(3,3); // mat2
}

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

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ PerEdgeAAQuadRenderStep()

◆ ~PerEdgeAAQuadRenderStep()

Member Function Documentation

◆ fragmentCoverageSkSL()

◆ vertexSkSL()

◆ writeUniformsAndTextures()

◆ writeVertices()