composite_f.glsl

#version 150

#define BLUR_Y 0.004

uniform sampler2D diffuseTexture;
uniform sampler2D lightsTexture;
uniform float time;
uniform vec2 resolution;
uniform float distortion;

in vec2 texcoord_out;

out vec4 color0;

void main(void) {
  vec2 pos = gl_FragCoord.xy / resolution;

  float distance = 0.004 * (sin(200 * time) / 2 + 1);
  distance *= sin(pos.y * 20 + 100 * time);
  distance *= sin(pos.y * 300 + 10 * time);
  distance *= 2 * sin(pos.y * 300 + time);

  float c = 1;
  c += 2. * sin(time * 4.0 + pos.y * 800.);
	c += 1. * sin(time * 1.0 + pos.y * 800.);
  c = mix(1, c, distortion);
  distance *= distortion;
  float blurAmount = BLUR_Y * distortion;

  vec3 xCoords = vec3(texcoord_out.x - distance,
                      texcoord_out.x + distance / 4,
                      texcoord_out.x + distance);

  float r = 0.0;
  r += texture2D(diffuseTexture, vec2(xCoords.r, texcoord_out.y + blurAmount)).r * 0.2;
  r += texture2D(diffuseTexture, vec2(xCoords.r, texcoord_out.y)).r * 0.6;
  r += texture2D(diffuseTexture, vec2(xCoords.r, texcoord_out.y - blurAmount)).r * 0.2;

  float g = 0.0;
  g += texture2D(diffuseTexture, vec2(xCoords.g, texcoord_out.y + blurAmount)).g * 0.2;
  vec4 center = texture2D(diffuseTexture, vec2(xCoords.g, texcoord_out.y));
  g += center.g * 0.6;
  g += texture2D(diffuseTexture, vec2(xCoords.g, texcoord_out.y - blurAmount)).g * 0.2;

  float b = 0.0;
  b += texture2D(diffuseTexture, vec2(xCoords.b, texcoord_out.y + blurAmount)).b * 0.2;
  b += texture2D(diffuseTexture, vec2(xCoords.b, texcoord_out.y)).b * 0.6;
  b += texture2D(diffuseTexture, vec2(xCoords.b, texcoord_out.y - blurAmount)).b * 0.2;

  float lightR = 0.0;
  lightR += texture2D(lightsTexture, vec2(xCoords.r + blurAmount, texcoord_out.y)).r * 0.2;
  lightR += texture2D(lightsTexture, vec2(xCoords.r, texcoord_out.y)).r * 0.6;
  lightR += texture2D(lightsTexture, vec2(xCoords.r - blurAmount, texcoord_out.y)).r * 0.2;

  float lightG = 0.0;
  lightG += texture2D(lightsTexture, vec2(xCoords.g + blurAmount, texcoord_out.y)).g * 0.2;
  lightG += texture2D(lightsTexture, vec2(xCoords.g, texcoord_out.y)).g * 0.6;
  lightG += texture2D(lightsTexture, vec2(xCoords.g - blurAmount, texcoord_out.y)).g * 0.2;

  float lightB = 0.0;
  lightB += texture2D(lightsTexture, vec2(xCoords.b + blurAmount, texcoord_out.y)).b * 0.2;
  lightB += texture2D(lightsTexture, vec2(xCoords.b, texcoord_out.y)).b * 0.6;
  lightB += texture2D(lightsTexture, vec2(xCoords.b - blurAmount, texcoord_out.y)).b * 0.2;


  vec3 color = vec3(r, g, b) * vec3(lightR, lightG, lightB) * c;
  color0 = vec4(color, center.a);
}