BaseMesh.h

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//
// Created by zhou_zhengming on 2026/5/11.
//
 
#pragma once
 
#include "BuiltinResource.h"
#include "Resource/ResourceRef.h"
#include "Vertex.h"
#include <string>
#include <vector>
 
namespace z8 {
enum class NormalTy {
  Generate,
  Preserve,
};
 
class BaseMesh : public Resource{
public:
  using IndexTy = uint16_t;
  std::vector<Vertex> V;
  std::vector<IndexTy> I;
 
  // 导入 FBX 模型的法线不能再做跨顶点平均，否则会破坏硬边或精确曲率
  NormalTy NormalMode = NormalTy::Generate;
 
  BaseMesh(){
    Type = ResourceTy::Mesh;
    Id = builtin::mesh::MeshPrefix;
  }
 
  unsigned VertexByteSize() const { return V.size() * sizeof(Vertex); }
  unsigned VertexElementSize() const { return sizeof(Vertex); }
  unsigned VertexCount() const { return V.size(); }
  unsigned IndexByteSize() const { return I.size() * sizeof(IndexTy); }
  unsigned IndexCount() const { return I.size(); }
  void ComputeNormals();
  bool Validate(std::string* error = nullptr) const;
  virtual void Update(){}
};
 
struct MeshImporter {
  BaseMesh Parse(std::string FileName);
};
} // namespace z8