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/* SPDX-License-Identifier: MIT-0 */
#include <assert.h>
#include <math.h>
#include <stdbool.h>
#include "schedule.h"
#define STOPLEN_ROUGH 10
#define STOPLEN_FINE 1
int SWITCH_INTERMEDIATE = SWITCH_INTERMEDIATE_DEFAULT;
static void emit_waypoint(const decostate_t *ds, segtype_t type, const waypoint_callback_t *wp_cb)
{
if (wp_cb && wp_cb->fn)
wp_cb->fn(ds, type, wp_cb->arg);
}
const gas_t *best_gas(double depth, const gas_t *gasses, int nof_gasses)
{
const gas_t *best = NULL;
double mod_best = -1;
for (int i = 0; i < nof_gasses; i++) {
double mod = gas_mod(&gasses[i]);
if (depth - mod < 1E-2 && (mod_best == -1 || mod < mod_best)) {
best = &gasses[i];
mod_best = mod;
}
}
return best;
}
int direct_ascent(const decostate_t *ds, double ascrate)
{
decostate_t ds_ = *ds;
assert(ds_.firststop == -1);
add_segment_ascdec(&ds_, ds_.depth, abs_depth(0), gauge_depth(ds_.depth) / ascrate, ds_.gas);
return gauge_depth(ceiling(&ds_, ds_.gfhi)) <= 0;
}
void simulate_dive(decostate_t *ds, const waypoint_t *waypoints, int nof_waypoints, const waypoint_callback_t *wp_cb)
{
for (int i = 0; i < nof_waypoints; i++) {
double d = waypoints[i].depth;
double t = waypoints[i].time;
const gas_t *g = waypoints[i].gas;
if (d != ds->depth)
add_segment_ascdec(ds, ds->depth, d, t, g);
else
add_segment_const(ds, d, t, g);
emit_waypoint(ds, SEG_DIVE, wp_cb);
}
}
double calc_ndl(decostate_t *ds, double ascrate)
{
double ndl = 0;
/* rough steps */
decostate_t ds_ = *ds;
while (ndl < 360) {
add_segment_const(&ds_, ds_.depth, STOPLEN_ROUGH, ds_.gas);
if (!direct_ascent(&ds_, ascrate))
break;
ndl = ds_.runtime - ds->runtime;
}
/* fine steps */
ds_ = *ds;
if (ndl)
add_segment_const(&ds_, ds_.depth, ndl, ds_.gas);
while (ndl < 360) {
add_segment_const(&ds_, ds_.depth, STOPLEN_FINE, ds_.gas);
if (!direct_ascent(&ds_, ascrate))
break;
ndl = ds_.runtime - ds->runtime;
}
return ndl;
}
static void deco_stop(decostate_t *ds, double next_stop, double current_gf)
{
double stoplen = 0;
/* rough steps */
decostate_t ds_ = *ds;
for (;;) {
add_segment_const(&ds_, ds_.depth, STOPLEN_ROUGH, ds_.gas);
if (ceiling(&ds_, current_gf) <= next_stop)
break;
stoplen = ds_.runtime - ds->runtime;
}
if (stoplen)
add_segment_const(ds, ds->depth, stoplen, ds->gas);
/* fine steps */
while (ceiling(ds, current_gf) > next_stop)
add_segment_const(ds, ds->depth, STOPLEN_FINE, ds->gas);
}
static int surfaced(decostate_t *ds)
{
return ds->depth - SURFACE_PRESSURE < 1E-2;
}
decoinfo_t calc_deco(decostate_t *ds, const gas_t *deco_gasses, int nof_gasses, const waypoint_callback_t *wp_cb)
{
const double runtime_start = ds->runtime;
const double asc_per_min = msw_to_bar(9);
double next_stop;
double current_gf;
const gas_t *best;
bool deco_started = false;
/* check if direct ascent is possible */
if (direct_ascent(ds, asc_per_min))
return (decoinfo_t){.tts = 0, .ndl = calc_ndl(ds, asc_per_min)};
/* prepare for the first stop */
next_stop = abs_depth(ds->ceil_multiple * (ceil(gauge_depth(ds->depth) / ds->ceil_multiple)));
while (next_stop >= ds->depth)
next_stop -= ds->ceil_multiple;
current_gf = get_gf(ds, next_stop);
/* alternate between ascending and stopping until we surface */
for (;;) {
/* ascend */
while (ceiling(ds, current_gf) < next_stop && !surfaced(ds)) {
/* switch to better gas if available */
best = best_gas(ds->depth, deco_gasses, nof_gasses);
if (SWITCH_INTERMEDIATE && best && best != ds->gas) {
/* emit waypoint because we're about to switch gas */
emit_waypoint(ds, deco_started ? SEG_TRAVEL : SEG_ASCENT, wp_cb);
/* switch gas */
add_segment_const(ds, ds->depth, 1, best);
emit_waypoint(ds, SEG_GAS_SWITCH, wp_cb);
continue;
}
/* ascend to next stop */
add_segment_ascdec(ds, ds->depth, next_stop, fabs(ds->depth - next_stop) / asc_per_min, ds->gas);
/* make next stop shallower */
next_stop -= ds->ceil_multiple;
if (LAST_STOP_AT_SIX && next_stop < abs_depth(msw_to_bar(6)))
next_stop = SURFACE_PRESSURE;
/* recalculate gf */
current_gf = get_gf(ds, next_stop);
}
if (ds->firststop == -1) {
ds->firststop = ds->depth;
/*
* if the first stop wasn't know yet during the previous call to
* get_gf, the result was inaccurate and needs to be recalculated
*/
current_gf = get_gf(ds, next_stop);
/* if the new gf also allows us to ascend further, continue ascending */
if (ceiling(ds, current_gf) < next_stop)
continue;
}
/* terminate if we surfaced */
if (surfaced(ds)) {
emit_waypoint(ds, SEG_SURFACE, wp_cb);
return (decoinfo_t){.ndl = 0, .tts = ds->runtime - runtime_start};
}
emit_waypoint(ds, deco_started ? SEG_TRAVEL : SEG_ASCENT, wp_cb);
deco_started = true;
/* switch to better gas if available */
best = best_gas(ds->depth, deco_gasses, nof_gasses);
if (best)
ds->gas = best;
/* stop until ceiling rises above next stop */
deco_stop(ds, next_stop, current_gf);
emit_waypoint(ds, SEG_DECO_STOP, wp_cb);
}
}
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