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#version 330
int delta = 20;
float barh = 0.02;
float barw = 0.4;
int nbar = 16;
float maxoff = 5;
float minoff = 2;
in vec2 texcoord; // texture coordinate of the fragment
uniform sampler2D tex; // texture of the window
ivec2 window_size = textureSize(tex, 0);
ivec2 window_center = ivec2(window_size.x/2, window_size.y/2);
// Default window post-processing:
// 1) invert color
// 2) opacity / transparency
// 3) max-brightness clamping
// 4) rounded corners
vec4 default_post_processing(vec4 c);
uniform float time; // Time in miliseconds.
float alpha = round(time/delta); // Like time, but in seconds and resets to
// Pseudo-random function (from original shader)
float random(float n) {
return fract(sin(n) * 43758.5453f);
}
float get_box() {
float n = random(alpha)*(nbar);
for(int i=0;i<n;i++){
float y = random(mod(alpha, 2048)+i) * window_size.y;
float x = random(mod(alpha+128, 2048)+i) * window_size.x;
float w = random(mod(alpha+64, 2048)+i) * barw*window_size.x;
float h = random(mod(alpha+32, 2048)+i) * barh*window_size.y;
if (texcoord.y > y && texcoord.y < y + h
&& texcoord.x > x && texcoord.x < x + w) {
return i*w*h*y*x*n;
}
}
return -1.0f;
}
float rand_offset(float b) {
return (random(b*64) - 0.5) * (maxoff*2);
}
vec4 window_shader() {
float b = get_box();
if (b == -1.0) {
vec4 c = texelFetch(tex, ivec2(texcoord), 0);
return default_post_processing(c);
}
//b = random(mod(alpha, 2000));
// Offsets in pixels for each color
vec2 uvr = vec2(rand_offset(b*1), rand_offset(b*6));
vec2 uvg = vec2(rand_offset(b*2),rand_offset(b*7));
vec2 uvb = vec2(rand_offset(b*3),rand_offset(b*8));
// Calculate offset coords
uvr += texcoord;
uvg += texcoord;
uvb += texcoord;
// Fetch colors using offset coords
vec3 offset_color;
offset_color.x = texelFetch(tex, ivec2(uvr), 0).x;
offset_color.y = texelFetch(tex, ivec2(uvg), 0).y;
offset_color.z = texelFetch(tex, ivec2(uvb), 0).z;
// Set the new color
vec4 c;
c.w = texelFetch(tex, ivec2(uvr), 0).w;
c.xyz = offset_color;
return default_post_processing(c);
}
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