sail-shader.shader

Shader "Custom/sail-shader"
{
    Properties
    {
        [Header(Appearance properties)]
        _Color ("Color", Color) = (1,1,1,1)
        _TintColor ("Tint color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        // _NoiseTex ("Noise Texture (RGB)", 2D) = "white" {}
        [KeywordEnum(Normal, Toon)] _ToonShading("Shading mode", Int) = 1
        _Bands("Toon bands", Int) = 5

        [Header(Deformation properties)]
        _VertFrequency ("Vertex sine frequency", Range(0, 150)) = 0.1
        _Frequency ("Frequency", Range(0, 150)) = 0.1
        _Magnitude ("Magnitude", Range(0, 150)) = 0.1
        _Direction ("Direction vector", Vector) = (0, 1, 0, 0)
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        Pass
        {
            Tags {"LightMode"="ForwardBase"}

            CGPROGRAM

            #pragma fragment frag
            #pragma vertex vert
            #pragma multi_compile_fog

            #include "UnityCG.cginc"
            #include "UnityLightingCommon.cginc"

            #pragma target 3.0

            uniform sampler2D _MainTex;
            uniform float4 _MainTex_ST;

            uniform sampler2D _NoiseTex;
            uniform float4 _NoiseTex_ST;

            uniform fixed4 _Color;
            uniform fixed4 _TintColor;
            uniform float _VertFrequency;
            uniform bool _ToonShading;
            uniform int _Bands;

            uniform float _Frequency;
            uniform float _Magnitude;
            uniform half3 _Direction;

            struct appdata
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float2 uv2 : TEXCOORD1;
                float4 vertex : SV_POSITION;
                float3 normal : NORMAL;
                float3 oldPos : NORMAL1;
            };

            float3 deform(float3 input, float2 uv)
            {
                
                float d = dot(normalize(_Direction), input);
                float a = (d * _VertFrequency) + (_Time * _Frequency);
                float m = abs(sin(a)) * _Magnitude * tex2Dlod (_NoiseTex, float4(uv,0,0));

                return m;
            }

            v2f vert (appdata v)
            {
                v2f o;
                o.oldPos = v.vertex.xyz;
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                o.uv2 = TRANSFORM_TEX(v.uv, _NoiseTex);
                o.vertex = UnityObjectToClipPos(v.vertex + deform(v.vertex.xyz, o.uv2));
                o.normal = UnityObjectToWorldNormal(v.normal);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                float3 d = deform(i.oldPos, i.uv2);

                half nl = max(0, dot(d, _WorldSpaceLightPos0.xyz));

                if(_ToonShading)
                    nl = round(nl * _Bands) / _Bands;

                float4 diff = nl * _LightColor0;

                // sample the texture
                fixed4 col = tex2D(_MainTex, i.uv) * diff * _Color + (_TintColor * _TintColor.a);
                // apply fog
                UNITY_APPLY_FOG(i.fogCoord, col);

                //col = round(col * 5.0) / 5.0;

                return col;
            }
            
            ENDCG
        }
    }
    FallBack "Diffuse"
}