Shader "AR/StylizedPenguin" {

    Properties {
        _MainTex ("Penguin Texture", 2D) = "white" {}
    }

    SubShader{
        Tags { "RenderType" = "Opaque" }

        Pass {

            Cull Off


            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag
            
            #include "UnityCG.cginc"
            

            fixed4 _Color;

            struct Input {
                float4 position : POSITION;
                float4 color : COLOR;
                float2 coord : TEXCOORD0;
                half3 normal : NORMAL;
            };

            struct VertexToFragment {
                float4 position : SV_POSITION;
                float4 color : COLOR;
                float2 coord : TEXCOORD0;
                half3 normal : NORMAL;
            };

            VertexToFragment vert(Input IN) {
                VertexToFragment OUT;
                OUT.position = UnityObjectToClipPos( IN.position);
                OUT.color = IN.color;
                OUT.coord = IN.coord;
                OUT.normal = UnityObjectToWorldNormal(IN.normal);
                return OUT;
            }
            
            sampler2D _MainTex;
            float2 _NoiseVector;

            
            fixed4 frag(VertexToFragment IN) : SV_Target {
            
                half4 c = tex2D(_MainTex, IN.coord);
                
                float3 forward = mul((float3x3)unity_CameraToWorld, float3(0,0,1));
                
                
               
                if (dot(normalize(forward), normalize(-1*IN.normal)) < 0.55) {
                    c.rgb = float3(0,0,0);
                } else {
                    c.rgb = float3(255,255,255);
                }
                
                
                float rand = frac(sin(dot(IN.position, _NoiseVector)) * 43758.5453);
                if (rand < 0.03) {
                    if (c.r == 0) {
                        c.rgb = float3(255, 255, 255);
                    } else {
                        c.rgb = float3(0,0,0);
                    }
                } 
                
                return c;
            }

            ENDCG
        }
    }
}