DX12GlobalConst.h

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//
// Created by zhou_zhengming on 2026/5/22.
//
 
#pragma once
#include <DirectXMath.h>
#include <array>
#include <cstddef>
#include <cstdint>
 
namespace z8 {
class DX12Render;
class DX12RenderBatch;
 
struct DX12Light {
  DirectX::XMFLOAT3 Position;
  float p0;
  DirectX::XMFLOAT3 Strength;
  float p1;
  DirectX::XMFLOAT3 Direction;
  float p2;
};
 
struct  DX12GlobalConst {
  static constexpr uint32_t MaxLights = 8;
 
  DirectX::XMFLOAT4X4A ViewProj;
  std::array<DX12Light, MaxLights> Lights;
  DirectX::XMFLOAT4 AmbientLight;
  DirectX::XMFLOAT3 Camera;
  uint32_t LightCount = 0;
  DirectX::XMFLOAT2 ScreenSize;
  DirectX::XMFLOAT2 UIOrigin = {0.0f, 0.0f};
  float TimeCost;
  float TimeTotal;
  float UIScale = 1.0f;
  float Padding = 0.0f;
 
  void Update(DX12Render* R);
  void WriteToBatch(DX12RenderBatch &batch) const;
  static unsigned AlignedSize();
 
private:
  void WriteToBuffer(DX12Render* R) const;
};
static_assert(offsetof(DX12GlobalConst, LightCount) == 476,
              "Light count must match cbPass packing in Const.hlsl.");
static_assert(offsetof(DX12GlobalConst, UIScale) == 504,
              "UI scale must match cbPass packing in Const.hlsl.");
static_assert(sizeof(DX12GlobalConst) == 512,
              "Global constants must match cbPass size in Const.hlsl.");
 
 
}