untitled.glsl

 
#ifdef GL_ES 
precision mediump float; 
#endif 
 
uniform vec2 u_resolution; 
uniform vec2 u_mouse; 
uniform float u_time; 
 
#define PI_TWO 1.570796326794897 
#define PI 3.141592653589793 
#define TWO_PI 6.283185307179586 
 
vec2 coord(in vec2 p) { 
    p = p / u_resolution.xy;
    // correct aspect ratio
    if (u_resolution.x > u_resolution.y) {
        p.x *= u_resolution.x / u_resolution.y;
        p.x += (u_resolution.y - u_resolution.x) / u_resolution.y / 2.0;
    } else {
        p.y *= u_resolution.y / u_resolution.x;
        p.y += (u_resolution.x - u_resolution.y) / u_resolution.x / 2.0;
    }
    // centering
    p -= 0.5;
    p *= vec2(-1.0, 1.0);
    return p;
} 
#define rx 1.0 / min(u_resolution.x, u_resolution.y)
#define uv gl_FragCoord.xy / u_resolution.xy 
#define st coord(gl_FragCoord.xy)
#define mx coord(u_mouse)
 
void main() { 
    vec3 color = vec3(
        abs(cos(st.x + mx.x)),
        abs(sin(st.y + mx.y)),
        abs(sin(u_time))
    );
    gl_FragColor = vec4(color, 1.0)
}