BlueRoseNote/07-Other/Unity/ComputeShader笔记.md

Shader

• RWStructuredBuffer:可读写，可用类型float1234、uint1234
• StructuredBuffer:对应的只读BUffer

C#脚本

声明变量

CS与Buffer

[SerializeField]
ComputeShader computeShader = default;

ComputeBuffer positionBuffer;

绑定CS中的变量并且执行

声明Shader中变量id以用于绑定

static readonly int intpositionsId = Shader.PropertyToID("_Positions"),
				resolutionId= Shader.PropertyToID("_Resolution"),
				stepId= Shader.PropertyToID("_Step"),
				timeId= Shader.PropertyToID("_Time");

给变量绑定数值

computeShader.SetInt(resolutionId, resolution);
computeShader.SetFloat(stepId, step);
computeShader.SetFloat(timeId, Time.time);
computeShader.SetBuffer(0, positionsId, positionBuffer);

执行

int groups = Mathf.CeilToInt(resolution / 8f);
computeShader.Dispatch(0, groups, groups, 1);

绘制GPU Instance命令

//需要传入边界盒以及绘制数量
var bounds=new Bounds(Vector3.zero,Vector3.one*(2f+2f/resolution));
Graphics.DrawMeshInstancedProcedural(mesh, 0, material,bounds,positionBuffer.count);

多kernel

CS可能拥有多个内核函数，此时computeShader的SetBuffer()与Dispatch()，可以通过第一个形参来设置kernel index。