You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
781 B
GLSL
39 lines
781 B
GLSL
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
|
|
#define PI 3.14159265359
|
|
#define TWO_PI 6.28318530718
|
|
|
|
uniform vec2 u_resolution;
|
|
uniform vec2 u_mouse;
|
|
uniform float u_time;
|
|
|
|
// Reference to
|
|
// http://thndl.com/square-shaped-shaders.html
|
|
|
|
void main(){
|
|
vec2 st = gl_FragCoord.xy/u_resolution.xy;
|
|
st.x *= u_resolution.x/u_resolution.y;
|
|
vec3 color = vec3(0.0);
|
|
float d = 0.0;
|
|
|
|
// Remap the space to -1. to 1.
|
|
st = st *2.-1.;
|
|
|
|
// Number of sides of your shape
|
|
int N = 3;
|
|
|
|
// Angle and radius from the current pixel
|
|
float a = atan(st.x,st.y)+PI;
|
|
float r = TWO_PI/float(N);
|
|
|
|
// Shaping function that modulate the distance
|
|
d = cos(floor(.5+a/r)*r-a)*length(st);
|
|
|
|
color = vec3(1.0-smoothstep(.4,.41,d));
|
|
// color = vec3(d);
|
|
|
|
gl_FragColor = vec4(color,1.0);
|
|
}
|