precision mediump float;
#define GLSLIFY 1
// Common uniforms
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
uniform float u_frame;

// Common varyings
varying vec3 v_position;
varying vec3 v_normal;

/*
 * Returns a value between 1 and 0 that indicates if the pixel is inside the circle

precision mediump float;
#define GLSLIFY 1
// Common uniforms
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
uniform float u_frame;

/*
 * Returns a value between 1 and 0 that indicates if the pixel is inside the square
 */
float square(vec2 pixel, vec2 bottom_left, float side) {
    vec2 top_right = bottom_left + side;

precision mediump float;
#define GLSLIFY 1
// Common uniforms
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
uniform float u_frame;

// Common varyings
varying vec3 v_position;
varying vec3 v_normal;

/*
 *  Calculates the diffuse factor produced by the light illumination