galaxy-v1

#extension GL_OES_standard_derivatives : enable

//
// GALAXY  - ENGINE
// Created by: atlas256
// Hello, from Ukraine
//

precision highp float;

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;
uniform sampler2D backbuffer;



vec3 color = vec3(0.0);

void main( void ) {

  vec2 uv = (gl_FragCoord.xy - resolution.xy*0.5) / resolution.y;
  vec2 pix = gl_FragCoord.xy;
	  
  vec2 mouse = mouse * resolution;
	
	
	color = texture2D(backbuffer, (pix.xy+vec2( 0.0,  0.0)) / resolution.xy).rgb; 
  
	vec3 sides[9];
	
	sides[0] = texture2D(backbuffer, (pix.xy+vec2( 0.0,  0.0)) / resolution.xy).rgb;
	sides[1] = texture2D(backbuffer, (pix.xy+vec2( 0.0, -1.0)) / resolution.xy).rgb;
	sides[2] = texture2D(backbuffer, (pix.xy+vec2( 1.0, -1.0)) / resolution.xy).rgb;
	sides[3] = texture2D(backbuffer, (pix.xy+vec2( 1.0,  0.0)) / resolution.xy).rgb;
	sides[4] = texture2D(backbuffer, (pix.xy+vec2( 1.0,  1.0)) / resolution.xy).rgb;
	sides[5] = texture2D(backbuffer, (pix.xy+vec2( 0.0,  1.0)) / resolution.xy).rgb;
	sides[6] = texture2D(backbuffer, (pix.xy+vec2(-1.0,  1.0)) / resolution.xy).rgb;
	sides[7] = texture2D(backbuffer, (pix.xy+vec2(-1.0,  0.0)) / resolution.xy).rgb;
	sides[8] = texture2D(backbuffer, (pix.xy+vec2(-1.0, -1.0)) / resolution.xy).rgb;

	
	vec3 mass = vec3(0.0);
	
	for (int i = 0; i < 9; i++) {
	  mass.r += sides[i].r / 9.0;
	  mass.g += sides[i].g / 9.0;
	  mass.b += sides[i].b / 9.0;
	};
	
	color.r = mass.r;
	color.g = mass.g;
	color.b = mass.b; 
	
	if (mass.r == 1.0 / 9.0) {
	  color.g = 1.0;
	} else {
	  color.r -= 1.0 / 1000.0;
	}
	
	if (mass.g == 1.0 / 9.0) {
	  color.b = 1.0;
	} else {
	  color.g -= 1.0 / 1000.0;
	}
	
	if (mass.b == 1.0 / 9.0) {
	  color.r = 1.0;
	} else {
	  color.b -= 1.0 / 1000.0;
	}
	
	 
        
	
  float v = distance(mouse, gl_FragCoord.xy);

	if(v < 10.0)color = vec3(sin(time), -sin(time), cos(time));
	
	if (mouse.x < 1.0)color = vec3(0.0);
	
  gl_FragColor = vec4(color, 1.0);
}