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

/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "src/gpu/graphite/render/TessellateCurvesRenderStep.h"

#include "src/sksl/SkSLString.h"

#include "src/gpu/graphite/BufferManager.h"
#include "src/gpu/graphite/DrawParams.h"
#include "src/gpu/graphite/DrawWriter.h"
#include "src/gpu/graphite/PipelineData.h"
#include "src/gpu/graphite/render/CommonDepthStencilSettings.h"
#include "src/gpu/graphite/render/DynamicInstancesPatchAllocator.h"

#include "src/gpu/tessellate/FixedCountBufferUtils.h"
#include "src/gpu/tessellate/PatchWriter.h"

namespace skgpu::graphite {

namespace {

usingnamespaceskgpu::tess;

// No fan point or stroke params, since this is for filled curves (not strokes or wedges)
// No explicit curve type on platforms that support infinity.
// No color or wide color attribs, since it might always be part of the PaintParams
// or we'll add a color-only fast path to RenderStep later.
static constexpr PatchAttribs kAttribs = …;
static constexpr PatchAttribs kAttribsWithCurveType = …;
Writer;

// The order of the attribute declarations must match the order used by
// PatchWriter::emitPatchAttribs, i.e.:
//     join << fanPoint << stroke << color << depth << curveType << ssboIndices
static constexpr Attribute kBaseAttributes[] = …;

static constexpr Attribute kAttributesWithCurveType[] = …;

static constexpr SkSpan<const Attribute> kAttributes[2] = {kAttributesWithCurveType,
                                                           kBaseAttributes};

}  // namespace

TessellateCurvesRenderStep::TessellateCurvesRenderStep(bool evenOdd,
                                                       bool infinitySupport,
                                                       StaticBufferManager* bufferManager)
        : … { … }

TessellateCurvesRenderStep::~TessellateCurvesRenderStep() { … }

std::string TessellateCurvesRenderStep::vertexSkSL() const { … }

void TessellateCurvesRenderStep::writeVertices(DrawWriter* dw,
                                               const DrawParams& params,
                                               skvx::ushort2 ssboIndices) const { … }

void TessellateCurvesRenderStep::writeUniformsAndTextures(const DrawParams& params,
                                                          PipelineDataGatherer* gatherer) const { … }

}  // namespace skgpu::graphite