Pendulum/shaders/fragment_pendula.glsl

#version 330 core

out vec4 FragColor;

in vec3 color;

uniform bool drawPoints;

void main() {
    if (drawPoints){
        vec2 coord = gl_PointCoord - vec2(0.5);
        if (length(coord) > 0.5)
            discard;
        if (length(coord) > 0.4)
            FragColor = vec4(1, 1, 1, 1);
        else
            FragColor = vec4(0, 0, 0, 1);
    } else {
        FragColor = vec4(color, 1);
    }
}