///physics()
//Physics for actors

//grav increases the player's downwards speed by raising vsp.
vsp += grav;


//Friction will reduce horizontal speed.
hsp -= frict * sign(hsp) * grounded;

//If hsp is lower than the friction value, it just sets hsp to 0.
if (abs(hsp) < frict)
{
    hsp = 0;
}

//Object carrying function.
carry();

//Adds hspCarry and vspCarry to hsp and vsp.
vsp += vspCarry;
hsp += hspCarry;

//Collision with walls. The player's position is changed after each collision function.
vsp = floor_collision(vsp);
hsp = wall_collision(hsp);

//Stops the player if it is going outside the horizontal edge of the screen.
if (oob_horizontal(x + hsp))
{
    hsp = 0;
}

//Objects have a terminal velocity. That is to say, there's a cap on how fast an object can move down.
vsp = min(8, vsp);

//Objects have a terminal velocity.
vspFinal = vsp;
hspFinal = hsp;

//Actually moves the object.
y += vspFinal;
x += hspFinal;

//Checks if an object is on the ground.
grounded = bottom(bbox_bottom + 1, ground);

//These variables control the speed the object is moving at if it's on top of something.
hspCarry = 0;
vspCarry = 0;