vertices_geometry.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#pragma once
 
#include "impeller/entity/geometry/geometry.h"
 
namespace impeller {
 
/// @brief A geometry that is created from a vertices object.
class VerticesGeometry : public Geometry {
 public:
  enum class VertexMode {
    kTriangles,
    kTriangleStrip,
    kTriangleFan,
  };
 
  VerticesGeometry(std::vector<Point> vertices,
                   std::vector<uint16_t> indices,
                   std::vector<Point> texture_coordinates,
                   std::vector<Color> colors,
                   Rect bounds,
                   VerticesGeometry::VertexMode vertex_mode);
 
  ~VerticesGeometry();
 
  GeometryResult GetPositionColorBuffer(const ContentContext& renderer,
                                        const Entity& entity,
                                        RenderPass& pass);
 
  // |Geometry|
  GeometryResult GetPositionUVBuffer(Rect texture_coverage,
                                     Matrix effect_transform,
                                     const ContentContext& renderer,
                                     const Entity& entity,
                                     RenderPass& pass) override;
 
  // |Geometry|
  GeometryResult GetPositionBuffer(const ContentContext& renderer,
                                   const Entity& entity,
                                   RenderPass& pass) override;
 
  // |Geometry|
  std::optional<Rect> GetCoverage(const Matrix& transform) const override;
 
  // |Geometry|
  GeometryVertexType GetVertexType() const override;
 
  bool HasVertexColors() const;
 
  bool HasTextureCoordinates() const;
 
  std::optional<Rect> GetTextureCoordinateCoverge() const;
 
 private:
  void NormalizeIndices();
 
  PrimitiveType GetPrimitiveType() const;
 
  std::vector<Point> vertices_;
  std::vector<Color> colors_;
  std::vector<Point> texture_coordinates_;
  std::vector<uint16_t> indices_;
  Rect bounds_;
  VerticesGeometry::VertexMode vertex_mode_ =
      VerticesGeometry::VertexMode::kTriangles;
};
 
}  // namespace impeller