DX12MeshManager.h

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//
// Created by zhou_zhengming on 2026/5/18.
//
 
#pragma once
#include <d3d12.h>
 
#include "DX12Common.h"
#include "DX12DefaultBuffer.h"
#include "Mesh/BaseMesh.h"
#include "Resource/ResourceRef.h"
 
#include <unordered_map>
 
namespace z8
{
struct DX12SubMesh {
  // 总索引数
  unsigned IndexCount = 0;
  // 起始索引偏移
  unsigned StartIndexLocation = 0;
  // 起始顶点偏移
  int BaseVertexLocation = 0;
};
 
class DX12MeshManager : public DX12Common{
public:
  BaseMesh MergeMesh;
 
  DX12DefaultBuffer VBuf;
  DX12DefaultBuffer IBuf;
 
  D3D12_VERTEX_BUFFER_VIEW Vv;
  D3D12_INDEX_BUFFER_VIEW Iv;
 
  DXGI_FORMAT FormatIBuf = DXGI_FORMAT_R16_UINT;
  std::unordered_map<ResourceRef<BaseMesh>, DX12SubMesh,
                     ResourceRefHash<BaseMesh>> SubMeshes;
 
  DX12MeshManager(DX12Render* R);
  void UnifyMesh();
  void Init();
  void Bind() const;
  DX12SubMesh* GetSubMesh(ResourceRef<BaseMesh> mesh);
};
}