[GLSL]着色器周记03

懒惰的一周~
http://www.cnblogs.com/easymind223/archive/2012/07/05/2578231.html
http://glslsandbox.com/e#21606.0
↑根据它们的指导做出来的Mandelbrot集~
 #version 440

#define r 300.0

uniform int _t;

vec2 center = vec2(1366.0 / 2.0, 768.0 / 2.0);

void main()

{

vec2 c = vec2((gl_FragCoord.x - center.x) / r, (gl_FragCoord.y - center.y) / r);

vec3 color;

vec2 z = c;

float a = 0;

for(int i = 0;i < 64;i++)

{

a = float(i);

z = vec2(z.x * z.x - z.y * z.y, 2 * z.x * z.y) + c;

if(length(z) > 32)

break;

}

gl_FragColor = vec4(vec3(a / float(20)), 1.0);

}