DX12ConstBuffer.h

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//
// Created by zhou_zhengming on 2026/5/12.
//
 
#pragma once
 
#include "DX12Common.h"
#include "DX12UploadBuffer.h"
#include "d3d12.h"
 
namespace z8
{
 
class DX12ConstBuffer: public DX12Common
{
  unsigned BufferCount = 0;
  unsigned SingleBufSize = 0;
  unsigned StepSize = 0;
public:
  DX12RenderBatch* Batch;
  DX12UploadBuffer Buffer;
 
  explicit DX12ConstBuffer(DX12RenderBatch* B);
 
  void InitBuffer();
  D3D12_GPU_VIRTUAL_ADDRESS GetGPUAddress(unsigned index) const;
 
  // 根据索引获取常量缓冲区的指针
  char* GetCPUOffset(unsigned index) const;
  // 获取全局常量的索引
  unsigned GetGlobalConstIndex() const { return BufferCount - 1; }
 
  // 返回 256 字节对齐的缓冲区大小
  static unsigned AlignedSize(unsigned size);
};
}