/** Returns the next value of the generator. */
result_type operator()()
{
// While it may seem wasteful to recalculate this
// every time, both msvc and gcc can propagate
// constants, resolving this at compile time.
base_unsigned range =
detail::subtract<base_result>()((_base.max)(), (_base.min)());
std::size_t m =
(range == (std::numeric_limits<base_unsigned>::max)()) ?
std::numeric_limits<base_unsigned>::digits :
detail::integer_log2(range + 1);
std::size_t n = (w + m - 1) / m;
std::size_t w0, n0;
base_unsigned y0, y1;
base_unsigned y0_mask, y1_mask;
calc_params(n, range, w0, n0, y0, y1, y0_mask, y1_mask);
if(base_unsigned(range - y0 + 1) > y0 / n) {
// increment n and try again.
++n;
calc_params(n, range, w0, n0, y0, y1, y0_mask, y1_mask);
}
BOOST_ASSERT(n0*w0 + (n - n0)*(w0 + 1) == w);
result_type S = 0;
for(std::size_t k = 0; k < n0; ++k) {
base_unsigned u;
do {
u = detail::subtract<base_result>()(_base(), (_base.min)());
} while(u > base_unsigned(y0 - 1));
S = (S << w0) + (u & y0_mask);
}
for(std::size_t k = 0; k < (n - n0); ++k) {
base_unsigned u;
do {
u = detail::subtract<base_result>()(_base(), (_base.min)());
} while(u > base_unsigned(y1 - 1));
S = (S << (w0 + 1)) + (u & y1_mask);
}
return S;
}
void xship_init(SDLData* d, XShip* s)
{
memset(s, 0, sizeof *s);
_turrets(d, s);
_reactors(d, s);
_base(d, s);
_cannon(d, s);
s->ship.mxspd = 300; /* 300 */
s->ship.accel = 0.15; /* 0.15 */
s->ship.weight = 1.07; /* 1.07 */
s->ship.shtfq_max = 0.05; /* 0.05 */
s->ship.shtfq_lost = 1.1;
s->ship.shtfq_curr = s->ship.shtfq_max;
}
span_size_t footer_size(void) const
noexcept {
return element_header_size(_base());
}
