unity urp下的GPU Instancing

shader

Shader "Custom/InstancedColorSurfaceShader"
{
    Properties
    {
        _Color("Color", Color) = (1.0, 1.0, 1.0, 1.0)
    }

    SubShader
    {
        Tags { "RenderType" = "Opaque" }
        LOD 100
        Pass
        {
            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_instancing
            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                UNITY_VERTEX_INPUT_INSTANCE_ID // use this to access instanced properties in the fragment shader.
            };

            UNITY_INSTANCING_BUFFER_START(Props)
                UNITY_DEFINE_INSTANCED_PROP(float4, _Color)
            UNITY_INSTANCING_BUFFER_END(Props)

            v2f vert(appdata v)
            {
                v2f o;

                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_TRANSFER_INSTANCE_ID(v, o);
                o.vertex = UnityObjectToClipPos(v.vertex);
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                UNITY_SETUP_INSTANCE_ID(i);
                return UNITY_ACCESS_INSTANCED_PROP(Props, _Color);
            }
            ENDHLSL
        }
    }
    FallBack "Diffuse"
}

设置颜色

using UnityEngine;

public class GpuManager : MonoBehaviour
{
    public GameObject[] objects;

    void Start()
    {
        MaterialPropertyBlock props = new MaterialPropertyBlock();
        MeshRenderer renderer;

        foreach (GameObject obj in objects)
        {
            float r = Random.Range(0.0f, 1.0f);
            float g = Random.Range(0.0f, 1.0f);
            float b = Random.Range(0.0f, 1.0f);
            props.SetColor("_Color", new Color(r, g, b));

            renderer = obj.GetComponent<MeshRenderer>();
            renderer.SetPropertyBlock(props);
        }
    }
}