// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

// Simplified Diffuse shader. Differences from regular Diffuse one:
// - no Main Color
// - fully supports only 1 directional light. Other lights can affect it, but it will be per-vertex/SH.

Shader "Carmen/UVGlow"
{
	Properties
	{
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 200

		Pass {
			Cull Off

			CGPROGRAM
			#include "UnityCG.cginc"

			#pragma vertex vert
			#pragma fragment frag

			sampler2D _MainTex;
			float4 _MainTex_ST;

			CBUFFER_START(UnityPerMaterial)
			uniform float4 _Emission;
			CBUFFER_END

			struct Data
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct V2F
			{
				float2 uv : TEXCOORD0;
				float4 position : SV_POSITION;
			};

			
			float3 Hue(float H)
			{
				return saturate(
					float3(abs(H * 6 - 3) - 1,
					2 - abs(H * 6 - 2),
					2 - abs(H * 6 - 4)));
			}

			float4 HSVtoRGB(in float3 HSV)
			{
				return float4(((Hue(HSV.x) - 1) * HSV.y + 1) * HSV.z, 1);
			}

			
			V2F vert(Data v)
			{
				V2F o;
				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
				o.position = UnityObjectToClipPos(v.vertex);
				return o;
			}

			fixed4 frag(V2F i) : SV_TARGET
			{
				return HSVtoRGB(float3(i.uv.x, 1.0, 1.0)) * (i.uv.y * 30.0);
			}

			ENDCG
		}
	}

	FallBack "VRChat/Mobile/Standard Lite"
}