Shader "LeapMotion/Passthrough/ThresholdOverlay" {
	Properties{
	  _Min("Min Brightness", Range(0, 1)) = 0.1
	  _Max("Max Brightness", Range(0, 1)) = 0.3
	  _Fade("Alpha Fade", Float) = 0.5
	}

		SubShader{
		  Tags {"Queue" = "Overlay" "IgnoreProjector" = "True" "RenderType" = "Transparent"}

		  Lighting Off
		  Cull Off
		  Zwrite Off
		  ZTest Off

		  Blend SrcColor DstColor
		  BlendOp Max

		  Pass{
		  CGPROGRAM
		  #pragma multi_compile LEAP_FORMAT_IR LEAP_FORMAT_RGB
		  #include "../Resources/LeapCG.cginc"
		  #include "UnityCG.cginc"

		  #pragma target 3.0

		  #pragma vertex vert
		  #pragma fragment frag

		  struct frag_in {
			float4 position : SV_POSITION;
			float4 screenPos  : TEXCOORD1;
		  };

		  frag_in vert(appdata_img v) {
			frag_in o;
			o.position = UnityObjectToClipPos(v.vertex);
			o.screenPos = LeapGetWarpedScreenPos(o.position);
			return o;
		  }

		  uniform float _Min;
		  uniform float _Max;
		  uniform float _Fade;

		  float4 frag(frag_in i) : COLOR {
			float3 color = LeapGetStereoColor(i.screenPos);
			float brightness = LeapGetStereoColor(i.screenPos);
			float alpha = _Fade * smoothstep(_Min, _Max, brightness);
			return float4(color, alpha);
		  }

		  ENDCG
		  }
	}
		Fallback off
}