28 lines
590 B
GLSL
28 lines
590 B
GLSL
uniform float time;
|
|
uniform vec2 resolution;
|
|
uniform vec4 mouse;
|
|
|
|
void main(void)
|
|
{
|
|
vec2 p = (2.0*gl_FragCoord.xy-resolution)/resolution.y;
|
|
|
|
// animate
|
|
float tt = mod(time,2.0)/2.0;
|
|
float ss = pow(tt,.2)*0.5 + 0.5;
|
|
ss -= ss*0.2*sin(tt*6.2831*5.0)*exp(-tt*6.0);
|
|
p *= vec2(0.5,1.5) + ss*vec2(0.5,-0.5);
|
|
|
|
|
|
float a = atan(p.x,p.y)/3.141593;
|
|
float r = length(p);
|
|
|
|
// shape
|
|
float h = abs(a);
|
|
float d = (13.0*h - 22.0*h*h + 10.0*h*h*h)/(6.0-5.0*h);
|
|
|
|
// color
|
|
float f = step(r,d)*pow(1.0-r/d,0.25);
|
|
|
|
gl_FragColor = vec4(f,0.0,0.0,1.0);
|
|
}
|