void aimbot::extrapolate(C_BaseEntity* player, Vector& origin, Vector& velocity, int& flags, bool on_ground)
{
	static const auto sv_gravity = g_pCvar->FindVar("sv_gravity");
	static const auto sv_jump_impulse = g_pCvar->FindVar("sv_jump_impulse");

	if (!(flags & FL_ONGROUND))
		velocity.z -= TICKS_TO_TIME(sv_gravity->GetFloat());
	else if (player->GetFlags() & FL_ONGROUND && !on_ground)
		velocity.z = sv_jump_impulse->GetFloat();

	const auto src = origin;
	auto end = src + velocity * g_pGlobalVars->intervalPerTick;

	Ray_t r;
	r.Init(src, end, player->GetMins(), player->GetMaxs());

	trace_t t{};
	CTraceFilter filter;
	filter.pSkip1 = player;

	g_pTrace->TraceRay(r, mask_playersolid, &filter, &t);

	if (t.flFraction != 1.f)
	{
		for (auto i = 0; i < 2; i++)
		{
			velocity -= t.plane.normal * velocity.Dot(t.plane.normal);

			const auto dot = velocity.Dot(t.plane.normal);
			if (dot < 0.f)
				velocity -= Vector(dot * t.plane.normal.x,
					dot * t.plane.normal.y, dot * t.plane.normal.z);

			end = t.end + velocity * TICKS_TO_TIME(1.f - t.flFraction);

			r.Init(t.end, end, player->GetMins(), player->GetMaxs());
			g_pTrace->TraceRay(r, mask_playersolid, &filter, &t);

			if (t.flFraction == 1.f)
				break;
		}
	}

	origin = end = t.end;
	end.z -= 2.f;

	r.Init(origin, end, player->GetMins(), player->GetMaxs());
	g_pTrace->TraceRay(r, mask_playersolid, &filter, &t);

	flags &= ~FL_ONGROUND;

	if (t.DidHit() && t.plane.normal.z > .7f)
		flags |= FL_ONGROUND;
}