shaders

assortment of fragment shaders.
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miyagi2.frag (481B)

      1 #ifdef GL_ES
      2 precision mediump float;
      3 #endif
      4 
      5 #define PI 3.14159265359
      6 
      7 uniform vec2 u_resolution;
      8 uniform vec2 u_mouse;
      9 uniform float u_time;
     10 
     11 void main() {
     12     vec2 st = gl_FragCoord.xy / u_resolution;
     13 
     14     float y = (sin(st.x * PI / 2.0 + (u_time * 1.5)) / 2.0) + 0.5;
     15 
     16     vec3 color = vec3(y);
     17     float pct = smoothstep(y - 0.02, y, st.y) - smoothstep(y, y + 0.02, st.y);
     18 
     19     color = (1.0 - pct) * color + pct * vec3(1.0, 0.0, 1.0);
     20 
     21     gl_FragColor = vec4(color, 1.0);
     22 }
     23