// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'



Shader "TripleBrick/showcase_bg" {
    Properties {
        _SkyColor ("Sky Color", Color) = (0.02553246,0.03709318,0.1827586,1)
        _HorizonColor ("Horizon Color", Color) = (0.06617647,0.5468207,1,1)
    }
    SubShader {
        Tags {
            "IgnoreProjector"="True"
            "Queue"="Background"
            "RenderType"="Opaque"
            "PreviewType"="Skybox"
        }
        Pass {
            Name "FORWARD"
            Tags {
                "LightMode"="ForwardBase"
            }
            
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #define UNITY_PASS_FORWARDBASE
            #include "UnityCG.cginc"
            #pragma multi_compile_fwdbase
            #pragma exclude_renderers gles3 metal d3d11_9x xbox360 xboxone ps3 ps4 psp2 
            #pragma target 3.0
            uniform float4 _SkyColor;
            uniform float4 _HorizonColor;
            struct VertexInput {
                float4 vertex : POSITION;
            };
            struct VertexOutput {
                float4 pos : SV_POSITION;
                float4 posWorld : TEXCOORD0;
            };
            VertexOutput vert (VertexInput v) {
                VertexOutput o = (VertexOutput)0;
                o.posWorld = mul(unity_ObjectToWorld, v.vertex);
                o.pos = UnityObjectToClipPos(v.vertex );
                return o;
            }
            float4 frag(VertexOutput i) : COLOR {
                float3 viewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
////// Lighting:
////// Emissive:
                float3 node_2737 = lerp(_SkyColor.rgb,_HorizonColor.rgb,pow((1.0 - max(0,dot(viewDirection,float3(0,1,0)))),0.1)); // Sky
                float3 emissive = node_2737;
                float3 finalColor = emissive;
                return fixed4(finalColor,1);
            }
            ENDCG
        }
    }
    
}