투명디스플레이 연구사업

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

Shader "Custom/BackgroundKeyShader" {

	Properties {

		_MainTex ("Base (RGB)", 2D) = "white" {}

		_ColorKey ("Color Key", Color) = (0,0,0,1)

		_ColorSensitivity ("Color Sensitivity", Float) = 0.6 

	}

	SubShader {

		Pass {

			Tags { "RenderType"="Opaque" }

			LOD 200

			CGPROGRAM

			#pragma vertex VertexShaderFunction

			#pragma fragment FragmentShaderFunction

			#include "UnityCG.cginc"

			struct VertexData{

				float4 position : POSITION;

				float2 uvs : TEXCOORD0;

			};

			struct VertexToFragment	{

				float4 position : SV_POSITION;

				float2 uvs : TEXCOORD0;

			};

			VertexToFragment VertexShaderFunction(VertexData input)	{

				VertexToFragment result;

				result.position = UnityObjectToClipPos (input.position);

				result.uvs = input.uvs;

				return result;

			}

			sampler2D _MainTex;

			float3 _ColorKey;

			float _ColorSensitivity;

			float4 FragmentShaderFunction(VertexToFragment input) : SV_Target	{

				float4 color = tex2D(_MainTex, input.uvs);

				float R = abs(color.r - _ColorKey.r);

				float G = abs(color.g - _ColorKey.g);

				float B = abs(color.b - _ColorKey.b);

				if (R < _ColorSensitivity && G < _ColorSensitivity && B < _ColorSensitivity){

					return float4(0.0f, 0.0f, 0.0f, 0.0f);

				}

				return color;

			}

			ENDCG

		}

	}

}