shader fix for SinglePassInstanced rendering

Fix

Modify the shader to include instancing support. Refer to the official Unity documentation: https://docs.unity3d.com/2020.3/Documentation/Manual/SinglePassInstancing.html

Insert the following code into the SubShader or Pass block as needed:

struct appdata
{
    float4 vertex : POSITION;
    float2 uv : TEXCOORD0;

    UNITY_VERTEX_INPUT_INSTANCE_ID // Insert
};

struct v2f
{
    float2 uv : TEXCOORD0;
    float4 vertex : SV_POSITION;

    UNITY_VERTEX_INPUT_INSTANCE_ID // Insert
    UNITY_VERTEX_OUTPUT_STEREO // Insert
};

v2f vert (appdata v)
{
    v2f o;

    UNITY_SETUP_INSTANCE_ID(v); // Insert
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o); // Insert

    o.vertex = UnityObjectToClipPos(v.vertex);
    o.uv = v.uv;

    return o;
}

Fix​

Fix