DX12RenderBatch.h

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//
// Created by zhou_zhengming on 2026/7/29.
//
 
#pragma once
#include "DX12Common.h"
#include "DX12ConstBuffer.h"
#include "DX12PipelineState.h"
#include "Material/BaseMaterial.h"
#include "Mesh/BaseMesh.h"
#include "Resource/ResourceRef.h"
#include "Shader/BaseShader.h"
#include "Texture/BaseTexture.h"
 
#include <memory>
#include <unordered_map>
#include <vector>
 
namespace z8 {
class GameObject;
struct DX12SubMesh;
 
class DX12RenderObject {
public:
  GameObject* Object;
  DX12SubMesh* SubMesh;
  ResourceRef<BaseMesh> Mesh;
  ResourceRef<BaseMaterial> Material;
  ResourceRef<BaseShader> Program;
  ResourceRef<BaseTexture> Texture;
  DX12PipelineState* Pipeline;
  unsigned ConstBufIndex;
 
  explicit DX12RenderObject(GameObject* O);
};
 
class DX12RenderBatch : public DX12Common {
public:
  std::vector<DX12RenderObject> ROs;
  DX12ConstBuffer Buffer;
 
  explicit DX12RenderBatch(DX12Render* render, bool preserveOrder = false);
 
  void Init(const std::vector<GameObject*>& Os);
  void Update() const;
  void Draw();
 
private:
  std::unordered_map<ResourceRef<BaseShader>,
                     std::unique_ptr<DX12PipelineState>,
                     ResourceRefHash<BaseShader>> Pipelines;
  // 透明 UI 必须维持画家顺序；不透明 3D 才能按状态排序减少切换。
  bool PreserveOrder;
};
}