mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-03 23:15:23 +00:00
25 lines
527 B
GLSL
25 lines
527 B
GLSL
// Author @patriciogv - 2015
|
|
// http://patriciogonzalezvivo.com
|
|
|
|
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
|
|
uniform vec2 u_resolution;
|
|
uniform vec2 u_mouse;
|
|
uniform float u_time;
|
|
|
|
float circle(in vec2 _st, in float _radius){
|
|
vec2 l = _st-vec2(0.5);
|
|
return 1.-smoothstep(_radius-(_radius*0.01),
|
|
_radius+(_radius*0.01),
|
|
dot(l,l)*4.0);
|
|
}
|
|
|
|
void main(){
|
|
vec2 st = gl_FragCoord.xy/u_resolution.xy;
|
|
|
|
vec3 color = vec3(circle(st,0.9));
|
|
|
|
gl_FragColor = vec4( color, 1.0 );
|
|
} |