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/*
* Copyright 2021 Google LLC.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef tessellate_PathWedgeTessellator_DEFINED
#define tessellate_PathWedgeTessellator_DEFINED
#include "src/gpu/tessellate/PathTessellator.h"
#include "src/core/SkArenaAlloc.h"
namespace skgpu {
// Prepares an array of "wedge" patches. A wedge is an independent, 5-point closed contour
// consisting of 4 control points plus an anchor point fanning from the center of the curve's
// resident contour. A wedge can be either a cubic or a conic. Quadratics and lines are converted to
// cubics. Once stencilled, these wedges alone define the complete path.
class PathWedgeTessellator final : public PathTessellator {
public:
static PathWedgeTessellator* Make(SkArenaAlloc* arena,
bool infinitySupport,
PatchAttribs attribs = PatchAttribs::kNone) {
return arena->make<PathWedgeTessellator>(infinitySupport, attribs);
}
PathWedgeTessellator(bool infinitySupport, PatchAttribs attribs = PatchAttribs::kNone)
: PathTessellator(infinitySupport, attribs) {
fAttribs |= PatchAttribs::kFanPoint;
}
int patchPreallocCount(int totalCombinedPathVerbCnt) const final;
void writePatches(PatchWriter&,
const SkMatrix& shaderMatrix,
const PathDrawList&) final;
// Size of the vertex buffer to use when rendering with a fixed count shader.
constexpr static int FixedVertexBufferSize(int maxFixedResolveLevel) {
return (((1 << maxFixedResolveLevel) + 1) + 1/*fan vertex*/) * sizeof(SkPoint);
}
// Writes the vertex buffer to use when rendering with a fixed count shader.
static void WriteFixedVertexBuffer(VertexWriter, size_t bufferSize);
// Size of the index buffer to use when rendering with a fixed count shader.
constexpr static int FixedIndexBufferSize(int maxFixedResolveLevel) {
return (NumCurveTrianglesAtResolveLevel(maxFixedResolveLevel) + 1/*fan triangle*/) *
3 * sizeof(uint16_t);
}
// Writes the index buffer to use when rendering with a fixed count shader.
static void WriteFixedIndexBuffer(VertexWriter vertexWriter, size_t bufferSize);
#if SK_GPU_V1
void prepareFixedCountBuffers(GrMeshDrawTarget*) final;
void drawTessellated(GrOpFlushState*) const final;
void drawFixedCount(GrOpFlushState*) const final;
#endif
};
} // namespace skgpu
#endif // tessellate_PathWedgeTessellator_DEFINED