quasi.glsl

// http://glslsandbox.com/e#29006.1


#ifdef GL_ES
precision mediump float;
#endif

// modified by @hintz
// further modded by @quilime

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;

#define PI 3.14159
#define TWO_PI (PI*2.0)
#define N 6.0

void main(void) 
{
	vec2 center = (gl_FragCoord.xy);
	
	vec2 v = (gl_FragCoord.xy) / min(resolution.y, resolution.x) * 35.0;
	float col = 1.5;

	for(float i = 0.0; i < N; i++) 
	{
	  	float a = i * (TWO_PI / N) * 44.85;
		col += cos(TWO_PI*(v.y * cos(a) + v.x * sin(a) + mouse.y +i*mouse.x + sin(time*.0014)*100.0 ));
	}
	
	col /= 5.0;

	gl_FragColor = vec4(col*1.0, -col*1.0,-col*4.0, 1.0);
}