Fragment shader study #2

gistfile1.c

/**
  Slits
  @sortofsleepy
*/

#ifdef GL_ES
precision mediump float;
#endif

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

void main( void ) {

	vec2 position = ( gl_FragCoord.xy / resolution.xy );

	float color = 0.0;
	color += sin( position.x * sin( time / 5.0 ) * 10.0 ) + sin( position.y * sin( time / 35.0 ) * 80.0 );
	color *= tan(resolution.y * gl_FragCoord.x);
	//color += position.x * cos(position.y) * time;
	
	gl_FragColor = vec4( vec3( color, color * 0.5, sin( color + time / 3.0 ) * 0.75 ), 1.0 );
}