Shader Library

#define BPM 130.0

varying vec2 v_uv;

uniform float u_time;

uniform vec2 u_resolution;

uniform vec2 u_mousepos;

float sdEquilateralTriangle( in vec2 p, in float r )

{

const float k = sqrt(3.0);

p.x = abs(p.x) - r;

p.y = p.y + r/k;

if( p.x+k*p.y>0.0 ) p = vec2(p.x-k*p.y,-k*p.x-p.y)/2.0;

p.x -= clamp( p.x, -2.0*r, 0.0 );

return -length(p)*sign(p.y);

}

vec3 palette(float t)

{

vec3 a = vec3(0.65, 0.5, 0.31);

vec3 b = vec3(-0.65, 0.5, 0.6);

vec3 c = vec3(0.333, 0.278, 0.278);

vec3 d = vec3(0.6, 0.0, 0.67);

return a + b * cos((PI * 2.0) * (c * t + d));

}

mat2 rotate2d(float p)

{

return mat2(

cos(p), -sin(p),