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#pragma once
#include <OpenMesh/Core/Mesh/TriMesh_ArrayKernelT.hh>
#include <filesystem>
#include <glm/vec2.hpp>
#include <thirdparty/openmesh/glmcompat.h>
struct TerrainTraits : public OpenMesh::DefaultTraits {
FaceAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
EdgeAttributes(OpenMesh::Attributes::Status);
VertexAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
HalfedgeAttributes(OpenMesh::Attributes::Normal | OpenMesh::Attributes::Status);
using Point = glm::vec3;
using Normal = glm::vec3;
};
class TerrainMesh : public OpenMesh::TriMesh_ArrayKernelT<TerrainTraits> {
public:
explicit TerrainMesh(const std::filesystem::path &);
struct PointFace {
PointFace(const glm::vec2 p) : point {p} { }
const glm::vec2 point;
mutable FaceHandle face {};
};
[[nodiscard]] FaceHandle findPoint(glm::vec2) const;
[[nodiscard]] FaceHandle findPoint(glm::vec2, FaceHandle start) const;
void walk(const glm::vec2 from, const glm::vec2 to, const std::function<void(FaceHandle)> & op) const;
void walkUntil(const glm::vec2 from, const glm::vec2 to, const std::function<bool(FaceHandle)> & op) const;
protected:
[[nodiscard]] static bool triangleContainsPoint(const glm::vec2, const glm::vec2, const glm::vec2, const glm::vec2);
[[nodiscard]] bool triangleContainsPoint(const glm::vec2, FaceHandle) const;
[[nodiscard]] bool triangleContainsPoint(const glm::vec2, ConstFaceVertexIter) const;
bool locate(const PointFace &) const;
bool locate(const PointFace &, FaceHandle start) const;
};
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