gistfile1.txt

Shader "Custom/FrostGL" {
  Properties {
		_MainTex ("Frost Map (RGB)", 2D) = "white" {}
		_FrostColor ("Frost Color", Color) = (1.0, 1.0, 1.0, 1.0)
		_Mask ("Mask", Vector) = (1.0, 1.0, 1.0, 1.0)
	}
	SubShader {
		Tags { "Queue"="Transparent" "RenderType"="Transparent" }
		LOD 100
		Pass {
			Blend SrcAlpha OneMinusSrcAlpha
			ZWrite Off
			Lighting Off

			GLSLPROGRAM

			uniform sampler2D _MainTex;
			uniform lowp vec4 _Mask;
			uniform lowp vec3 _FrostColor;

			varying mediump vec2 uv;

			#ifdef VERTEX
			void main() {                                
				uv = vec2(gl_MultiTexCoord0);
				gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
			}
			#endif


			#ifdef FRAGMENT
			const lowp float SMALL = 0.1;
			const lowp float TWO = 2.0;

			void main() {
				lowp vec4 c = texture2D(_MainTex, uv);
				//lowp float r = step(SMALL, _Mask.x*c.r)*c.r*TWO;
				//lowp float b = step(SMALL, _Mask.z*c.b)/TWO;
				gl_FragColor = vec4(_FrostColor, max(max(step(SMALL, _Mask.x*c.r)*c.r*TWO, _Mask.z*c.g), step(SMALL, _Mask.z*c.b)/TWO));
			}
			#endif
			
			ENDGLSL
		}
	} 
}