Interactive Mandelbrot viewer with Qt and OpenGL.
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

70 lines
1.6 KiB

#version 330 core
out vec4 pixColor;
uniform int maxIterationsCount;
uniform float hueAdd;
uniform bool normalize;
in vec2 complexPos;
vec3 hsvToRgb(in float h, in float s, in float v){
float c = v * s;
float x = c * (1 - abs(mod(h / 60, 2) - 1));
float m = v - c;
vec3 rgbT;
if (0 <= h && h < 60)
rgbT = vec3(c, x, 0);
if (60 <= h && h < 120)
rgbT = vec3(x, c, 0);
if (120 <= h && h < 180)
rgbT = vec3(0, c, x);
if (180 <= h && h < 240)
rgbT = vec3(0, x, c);
if (240 <= h && h < 300)
rgbT = vec3(x, 0, c);
if (300 <= h && h < 360)
rgbT = vec3(c, 0, x);
vec3 rgb = rgbT + m;
return rgb;
}
vec3 getColor(in float modifier){
float hue = mod(modifier * 360 + hueAdd, 360);
float sat = 1;
float value = modifier == 0 ? 0 : 1;
return hsvToRgb(hue, sat, value);
}
vec2 square(in vec2 c){
return vec2(c.x * c.x - c.y * c.y, 2 * c.x * c.y);
}
vec2 m(in vec2 c){
return square(c) + complexPos;
}
float mandelbrot(in vec2 c){
vec2 z = vec2(0, 0);
float steps = 0;
float escapeSquared = pow(1 << 8, 2);
while (steps < maxIterationsCount && pow(z.x, 2) + pow(z.y, 2) < escapeSquared){
z = m(z);
++steps;
}
if (steps == maxIterationsCount)
return 0.;
if (normalize){
float log_zn = log(z.x * z.x + z.y * z.y) / 2;
float nu = log(log_zn / log(2.)) / log(2.);
steps += 1 - nu;
}
float t = steps / maxIterationsCount;
return sqrt(t);
}
void main(){
float modifier = mandelbrot(complexPos);
pixColor = vec4(getColor(modifier), 1);
}