mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-19 15:25:41 +00:00
33 lines
707 B
GLSL
33 lines
707 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;
|
|
|
|
void main(){
|
|
vec2 st = gl_FragCoord.xy/u_resolution;
|
|
float pct = 0.0;
|
|
|
|
// a. The DISTANCE from the pixel to the center
|
|
pct = distance(st,vec2(0.5));
|
|
|
|
// b. The LENGTH of the vector
|
|
// from the pixel to the center
|
|
// vec2 toCenter = vec2(0.5)-st;
|
|
// pct = length(toCenter);
|
|
|
|
// c. The SQUARE ROOT of the vector
|
|
// from the pixel to the center
|
|
// vec2 tC = vec2(0.5)-st;
|
|
// pct = sqrt(tC.x*tC.x+tC.y*tC.y);
|
|
|
|
vec3 color = vec3(pct);
|
|
|
|
gl_FragColor = vec4( color, 1.0 );
|
|
}
|