inline void GRRLIB_Circle(f32 x, f32 y, f32 radius, u32 color, u8 filled) {
    Vector v[37];
    u32 ncolor[37];
    u32 a;
    f32 ra;
    f32 G_DTOR = M_DTOR * 10;

    for (a = 0; a < 37; a++) {
        ra = a * G_DTOR;

        v[a].x = cos(ra) * radius + x;
        v[a].y = sin(ra) * radius + y;
        v[a].z = 0.0f;
        ncolor[a]  = color;
    }

    if (!filled) {
        GRRLIB_GXEngine(v, ncolor, 37, GX_LINESTRIP);
    }
    else {
        GRRLIB_GXEngine(v, ncolor, 37, GX_TRIANGLEFAN);
    }
}