gistfile1.glsl

Shader "GiantOtter/Outlined Diffuse" {
	Properties {
		_Color ("Main Color", Color) = (.5,.5,.5,1)
		_OutlineColor ("Outline Color", Color) = (0,0,0,1)
		_OutlineWidth ("Outline width", Range (0.0, 0.5)) = .005
		_MainTex ("Base (RGB)", 2D) = "white" { }
	}

	CGINCLUDE
	#include "UnityCG.cginc"

	struct appdata {
		float4 vertex : POSITION;
		float3 normal : NORMAL;
	};

	struct v2f {
		float4 pos : POSITION;
		float4 color : COLOR;
	};

	uniform float _OutlineWidth;
	uniform float4 _OutlineColor;

	v2f vert(appdata v) {
		// Project the normal into screenspace
		float3 screenspaceNormal = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal);

		float2 offset = TransformViewToProjection(screenspaceNormal.xy);

		v2f o;
		o.pos = mul(UNITY_MATRIX_MVP, v.vertex).z;
		o.pos.xy += offset * _OutlineWidth /* * o.pos.z */;
		o.color = _OutlineColor;
		return o;
	}
	ENDCG

	SubShader {
		Tags { "Queue" = "Transparent" }

		// note that a vertex shader is specified here but its using the one above
		Pass {
			Name "OUTLINE"
			Tags { "LightMode" = "Always" }
			Cull Off
			ZWrite Off
			//ZTest Always
			ColorMask RGB // alpha not used

			// you can choose what kind of blending mode you want for the outline
			Blend SrcAlpha OneMinusSrcAlpha // Normal
			//Blend One One // Additive
			//Blend One OneMinusDstColor // Soft Additive
			//Blend DstColor Zero // Multiplicative
			//Blend DstColor SrcColor // 2x Multiplicative

			CGPROGRAM
#pragma vertex vert
#pragma fragment frag

			half4 frag(v2f i) : COLOR {
				return i.color;
			}
			ENDCG
		}

		Pass {
			Name "BASE"
				ZWrite On
				ZTest LEqual
				Blend SrcAlpha OneMinusSrcAlpha
				Material {
					Diffuse [_Color]
						Ambient [_Color]
				}
			Lighting On
				SetTexture [_MainTex] {
					ConstantColor [_Color]
						Combine texture * constant
				}
			SetTexture [_MainTex] {
				Combine previous * primary DOUBLE
			}
		}
	}

	SubShader {
		Tags { "Queue" = "Transparent" }

		Pass {
			Name "OUTLINE"
				Tags { "LightMode" = "Always" }
			Cull Front
				ZWrite Off
				//ZTest Always
				ColorMask RGB

				// you can choose what kind of blending mode you want for the outline
				Blend SrcAlpha OneMinusSrcAlpha // Normal
				//Blend One One // Additive
				//Blend One OneMinusDstColor // Soft Additive
				//Blend DstColor Zero // Multiplicative
				//Blend DstColor SrcColor // 2x Multiplicative

				CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma exclude_renderers gles xbox360 ps3

				half4 frag(v2f i) : COLOR {
					return i.color;
				}

				ENDCG
				SetTexture [_MainTex] { combine primary }
		}

		Pass {
			Name "BASE"
				ZWrite On
				ZTest LEqual
				Blend SrcAlpha OneMinusSrcAlpha
				Material {
					Diffuse [_Color]
						Ambient [_Color]
				}
			Lighting On
				SetTexture [_MainTex] {
					ConstantColor [_Color]
						Combine texture * constant
				}
			SetTexture [_MainTex] {
				Combine previous * primary DOUBLE
			}
		}
	}

	Fallback "Diffuse"
}