Shader "FluidDynamics/MatRenderer2" 
{    
    Properties
    {
        _MainTex ("MainTexture", 2D) = "white" {}
    }
    SubShader 
    {
        Blend SrcAlpha OneMinusSrcAlpha 
        ZWrite Off
        Tags {"Queue" = "Transparent" }
        ZTest LEqual
        CGPROGRAM
        #include "UnityCG.cginc"
        #pragma surface surf Lambert addshadow fullforwardshadows
        #pragma target 4.5
        float2 _Size;
        #ifdef SHADER_API_D3D11
            StructuredBuffer<float> _Particles;
            StructuredBuffer<float4> _ColourRamp;
        #endif
        
        struct Input
        {
            float2 uv;
        };

        void surf (Input IN, inout SurfaceOutput o) {
            #ifdef SHADER_API_D3D11
                int x = (int)(IN.uv.x*_Size.x);
                int y = (int)(IN.uv.y*_Size.y);
                float4 col = _ColourRamp[clamp(_Particles[y*_Size.x + x], 0.0, 255.0)];
                o.Albedo = col.rgb;
                o.Alpha = col.a;
            #endif
        }
        ENDCG
    }
    Fallback "Diffuse"
}