mirror of
https://github.com/bvanroll/shaders.git
synced 2025-08-29 20:12:48 +00:00
32 lines
624 B
GLSL
32 lines
624 B
GLSL
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
uniform vec2 u_resolution;
|
|
uniform vec2 u_mouse;
|
|
uniform float u_time;
|
|
|
|
#define PI 3.14159265359
|
|
|
|
float circle(in vec2 st, in float radius){
|
|
vec2 dist = st-vec2(.5);
|
|
return 1.-smoothstep(radius-(radius*.01),
|
|
radius+(radius*.01),
|
|
dot(dist,dist)*4.);
|
|
}
|
|
|
|
|
|
void main() {
|
|
vec2 st = gl_FragCoord.xy/u_resolution;
|
|
st.x *= u_resolution.x/u_resolution.y;
|
|
vec3 color = vec3(1.0);
|
|
float alpha = 0.;
|
|
float d = 0.0;
|
|
// remaps space to -1 1
|
|
st = st *2.-1.;
|
|
d = length(abs(st)-.3);
|
|
|
|
|
|
|
|
gl_FragColor = vec4(color, alpha);
|
|
}
|