thebookofshaders/08/cross.frag
2015-03-15 11:35:14 -04:00

27 lines
627 B
GLSL

// Author @patriciogv - 2015
// http://patriciogonzalezvivo.com
#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform float u_time;
float box(vec2 _st, vec2 _size){
_size = vec2(0.5) - _size*0.5;
vec2 uv = smoothstep(_size,
_size+vec2(0.0001),
_st);
uv *= smoothstep(_size,
_size+vec2(0.0001),
vec2(1.0)-_st);
return uv.x*uv.y;
}
void main(){
vec2 st = gl_FragCoord.xy/u_resolution.xy;
vec3 color = vec3( box(st, vec2(0.4,0.1)) + box(st, vec2(0.1,0.4)) );
gl_FragColor = vec4(color,1.0);
}