text 一旦完成ハート版本追加

Posted 2021-05-02

Shader "Test"
 {
     Properties
     {
        _MainTex("MainTex", 2D) = "white"{}
        _Value("Value", Range(0, 20)) = 20
        _PatternCount("Count", Float) = 10
        _StartPos("StartPos", Vector) = (1, 0,0,0)
     }
     CGINCLUDE
     #include "UnityCG.cginc"
     
    float _Value;
    float _PatternCount;
    fixed2 _StartPos;
    sampler2D _MainTex;
    
    float star(float2 st, float size)
    {
        st -= 0.5;
        st /= size;

        float a = atan2(st.y, st.x);// + _Time.y * 0.3;
        float l = pow(length(st), 0.8);
        float d = l - 0.5 + cos(a * 5.0) * 0.08;

        return 1 - smoothstep(0, 0.1, d);
    }

    float box(float2 st, float size)
    {
        // 中心揃えにする四角形描画
        size = 0.5 + size * 0.5;
        st = step(st, size) * step(1 - st, size);
        return st.x * st.y;
    }
    
    float wave(float2 uv, float2 n, float2 startPos)
    {
        // 0.5なら中心が原点
        // 右下を原点とする
        float2 offset = startPos;//float2(1, 0); or (-1, 0)
        float speed = 3;
        float waveNum = 3;
        
        // nで除算して正規化している
        float2 st = (floor(uv * n) + offset) / n;
        float d = distance(offset, st);
        
        // (1+ ~~~)*0.5は-1 ~ 1 => 0 ~ 1に正規化する処理
        return d * _Value*0.5;
        return (1 + sin(d * _Value)) * 0.5;
    }
    
    fixed4 frag(v2f_img i) : SV_Target
    {
        float offset = 0.5;
        float2 puv = i.uv; 
        puv.x -= offset;
        puv.x *= _ScreenParams.x / _ScreenParams.y;
        puv.x += offset;
    
        float n = _PatternCount;
        float2 st = frac(puv * n);
        float size = wave(puv, n, _StartPos);
        float col = star(st, size);
        
        clip(col-0.5);
        fixed4 diffuse = tex2D(_MainTex, i.uv);
        return col * diffuse + (1 - _Value / 20) * 0.2;
    }
 
     ENDCG
     SubShader
     {
         Pass
         {
             CGPROGRAM
             #pragma vertex vert_img
             #pragma fragment frag
             ENDCG
         }
     }
 }