Shader "Custom/AnimatedSpriteSurfaceShader"
{
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Glossiness ("Smoothness", Range(0,1)) = 0.5
_Metallic ("Metallic", Range(0,1)) = 0.0

    _CellRowAmount("Cell Row Amount", float) = 1
    _CellColumnAmount("Cell Column Amount", float) = 1
    _Speed("Speed", Range(0.01, 32)) = 12
}
SubShader {
    Tags { "RenderType"="Opaque" }
    LOD 200

    CGPROGRAM
    // Physically based Standard lighting model, and enable shadows on all light types

pragma surface surf Standard fullforwardshadows

    // Use shader model 3.0 target, to get nicer looking lighting

pragma target 3.0

    sampler2D _MainTex;

    struct Input {
        float2 uv_MainTex;
    };

    half _Glossiness;
    half _Metallic;
    fixed4 _Color;

    float4 _MainTex_TexelSize;

    float _CellRowAmount;
    float _CellColumnAmount;
    float _Speed;

    void surf (Input IN, inout SurfaceOutputStandard o)
    {
        float2 spriteUV = IN.uv_MainTex;

        float cellUVRowPercentage = 1 / _CellRowAmount;
        float cellUVColumnPercentage = 1 / _CellColumnAmount;

        int index = fmod(_Time.y * _Speed, _CellRowAmount * _CellColumnAmount);

        int rowIndex = index / _CellColumnAmount;
        int columnIndex = index - (rowIndex * _CellColumnAmount);//fmod(index, _CellColumnAmount);

        float xValue = spriteUV.x / _CellColumnAmount;
        xValue += columnIndex * cellUVColumnPercentage;
        float yValue = (_CellRowAmount - 1 + spriteUV.y) / _CellRowAmount;
        yValue -= rowIndex * cellUVRowPercentage;

        spriteUV = float2(xValue, yValue);

        // Albedo comes from a texture tinted by color
        fixed4 c = tex2D (_MainTex, spriteUV) * _Color;
        o.Albedo = c.rgb;
        // Metallic and smoothness come from slider variables
        o.Metallic = _Metallic;
        o.Smoothness = _Glossiness;
        o.Alpha = c.a;
    }
    ENDCG
}
FallBack "Diffuse"

}

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