texture-packer/TexturePackerSimple.shader at main · wonkee-kim/texture-packer · GitHub

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Shader "Hidden/TexturePackerSimple"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _RedTex ("Metallic Texture", 2D) = "white" {}
        _GreenTex ("Smoothness Texture", 2D) = "white" {}
        _BlueTex ("Ambient Occlusion Texture", 2D) = "white" {}

        _RedChannel ("Red Channel", Int) = 0
        _GreenChannel ("Green Channel", Int) = 0
        _BlueChannel ("Blue Channel", Int) = 0

        _RedDefault ("Red Default", Float) = 1
        _GreenDefault ("Red Default", Float) = 1
        _BlueDefault ("Red Default", Float) = 1

        _RedInvert ("Red Invert", Int) = 0
        _GreenInvert ("Green Invert", Int) = 0
        _BlueInvert ("Blue Invert", Int) = 0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

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

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            float4 _MainTex_ST;
            sampler2D _MainTex;
            sampler2D _RedTex;
            sampler2D _GreenTex;
            sampler2D _BlueTex;

            int _RedChannel;
            int _GreenChannel;
            int _BlueChannel;

            float _RedDefault;
            float _GreenDefault;
            float _BlueDefault;

            int _RedInvert;
            int _GreenInvert;
            int _BlueInvert;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            float4 frag (v2f i) : SV_Target
            {
                float red, green, blue;
                if(_RedChannel == -1)
                {
                    red = _RedDefault;
                }
                else
                {
                    red = tex2D(_RedTex, i.uv)[_RedChannel];
                    if(_RedInvert == 1)
                    {
                        // Gamma correction
                        half3 redLinear = LinearToGammaSpace(red);
                        redLinear = 1 - redLinear;
                        red = GammaToLinearSpace(redLinear);
                    }
                }
                if(_GreenChannel == -1)
                {
                    green = _GreenDefault;
                }
                else
                {
                    green = tex2D(_GreenTex, i.uv)[_GreenChannel];
                    if(_GreenInvert == 1)
                    {
                        // Gamma correction
                        half3 greenLinear = LinearToGammaSpace(green);
                        greenLinear = 1 - greenLinear;
                        green = GammaToLinearSpace(greenLinear);
                    }
                }
                if(_BlueChannel == -1)
                {
                    blue = _BlueDefault;
                }
                else
                {
                    blue = tex2D(_BlueTex, i.uv)[_BlueChannel];
                    if(_BlueInvert == 1)
                    {
                        // Gamma correction
                        half3 blueLinear = LinearToGammaSpace(blue);
                        blueLinear = 1 - blueLinear;
                        blue = GammaToLinearSpace(blueLinear);
                    }
                }
                return float4(red, green, blue, 1);
            }
            ENDCG
        }
    }
}