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wheel.frag
38 lines (31 loc) · 859 Bytes
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wheel.frag
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#ifdef GL_ES
precision mediump float;
#endif
#define TWO_PI 6.28318530718
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
vec3 hsb2rgb( in vec3 c ){
vec3 rgb = clamp(abs(mod(c.x*6.0+vec3(0.0,4.0,2.0),
6.0)-3.0)-1.0,
0.0,
1.0 );
rgb = rgb*rgb*(3.0-2.0*rgb);
return c.z * mix( vec3(1.0), rgb, c.y);
}
void main(){
vec2 st = gl_FragCoord.xy/u_resolution;
vec3 color = vec3(1.0);
st *= 2.0;
float dist = distance(vec2(1.0), st);
vec2 toCenter = vec2(1.0) - st;
float angle = atan(toCenter.y, toCenter.x);
angle = (angle / TWO_PI) + 0.5;
if(dist <= 1.0)
{
vec3 hsb = vec3(1.0, angle, dist);
color = vec3(1.0,0.0,0.);
color = hsb2rgb(hsb);
}
gl_FragColor = vec4(color,1.0);
}