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/* SPDX-License-Identifier: MIT-0 */
#include <assert.h>
#include <math.h>
#include "schedule.h"
#define SWITCH_INTERMEDIATE 1
const gas_t *best_gas(const double depth, const gas_t *gasses, const 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 && (mod_best == -1 || mod < mod_best)) {
best = &gasses[i];
mod_best = mod;
}
}
return best;
}
const gas_t *next_gas(const double depth, const gas_t *gasses, const int nof_gasses)
{
const gas_t *next = NULL;
double mod_best = 0;
for (int i = 0; i < nof_gasses; i++) {
double mod = gas_mod(&gasses[i]);
if (depth > mod && mod > mod_best) {
next = &gasses[i];
mod_best = mod;
}
}
return next;
}
int direct_ascent(const decostate_t *ds, const double depth, const double time, const gas_t *gas)
{
decostate_t ds_ = *ds;
assert(ds_.firststop == -1);
add_segment_ascdec(&ds_, depth, SURFACE_PRESSURE, time, gas);
return ceiling(&ds_, ds_.gfhi) <= SURFACE_PRESSURE;
}
void simulate_dive(decostate_t *ds, waypoint_t *waypoints, const int nof_waypoints, segment_callback_t seg_cb)
{
double depth = SURFACE_PRESSURE;
double runtime = 0;
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 != depth) {
runtime += add_segment_ascdec(ds, depth, d, t, g);
depth = d;
} else {
runtime += add_segment_const(ds, d, t, g);
}
seg_cb(ds, (waypoint_t){.depth = d, .time = t, .gas = g}, SEG_DIVE);
}
}
double calc_ndl(decostate_t *ds, const double depth, const double ascrate, const gas_t *gas)
{
decostate_t ds_ = *ds;
double ndl = 0;
while (ndl < 360) {
double tmp = add_segment_const(&ds_, depth, 1, gas);
if (!direct_ascent(&ds_, depth, gauge_depth(depth) / ascrate, gas))
break;
ndl += tmp;
}
return ndl;
}
decoinfo_t calc_deco(decostate_t *ds, const double start_depth, const gas_t *start_gas, const gas_t *deco_gasses,
const int nof_gasses, segment_callback_t seg_cb)
{
decoinfo_t ret = {.tts = 0, .ndl = 0};
/* setup start parameters */
double depth = start_depth;
const gas_t *gas = start_gas;
const double asc_per_min = msw_to_bar(9);
/* check if direct ascent is possible */
if (direct_ascent(ds, depth, gauge_depth(depth) / asc_per_min, gas)) {
ret.ndl = calc_ndl(ds, depth, asc_per_min, gas);
return ret;
}
/* determine first stop */
double current_gf = get_gf(ds, depth);
if (ds->firststop == -1)
ds->firststop = ceiling(ds, current_gf);
/* switch to best deco gas if there is one available */
const gas_t *best = best_gas(depth, deco_gasses, nof_gasses);
if (best)
gas = best;
/* alternate between ascending and stopping */
for (;;) {
/* ascend */
for (;;) {
double stopdep = ceiling(ds, current_gf);
const gas_t *next = next_gas(depth, deco_gasses, nof_gasses);
if (SWITCH_INTERMEDIATE && next) {
/* determine switch depth */
double switch_depth = round_ceiling(ds, next->mod) - ds->ceil_multiple;
assert(switch_depth <= next->mod);
if (switch_depth > stopdep) {
/* ascend to switch depth */
ret.tts += add_segment_ascdec(ds, depth, switch_depth, (depth - switch_depth) / asc_per_min, gas);
seg_cb(
ds,
(waypoint_t){.depth = switch_depth, .time = (depth - switch_depth) / asc_per_min, .gas = gas},
SEG_TRAVEL);
depth = switch_depth;
current_gf = get_gf(ds, depth);
/* switch gas */
gas = next;
add_segment_const(ds, switch_depth, 1, gas);
seg_cb(ds, (waypoint_t){.depth = depth, .time = 1, .gas = gas}, SEG_GAS_SWITCH);
continue;
}
}
ret.tts += add_segment_ascdec(ds, depth, stopdep, (depth - stopdep) / asc_per_min, gas);
if (stopdep <= SURFACE_PRESSURE)
seg_cb(ds, (waypoint_t){.depth = stopdep, .time = (depth - stopdep) / asc_per_min, .gas = gas},
SEG_SURFACE);
else
seg_cb(ds, (waypoint_t){.depth = stopdep, .time = (depth - stopdep) / asc_per_min, .gas = gas},
SEG_TRAVEL);
depth = stopdep;
current_gf = get_gf(ds, depth);
/* if the ceiling moved while we ascended, keep ascending */
if (depth > ceiling(ds, current_gf))
continue;
break;
}
/* terminate if we surfaced */
if (depth <= SURFACE_PRESSURE)
break;
/* switch to better gas if available */
const gas_t *best = best_gas(depth, deco_gasses, nof_gasses);
if (best)
gas = best;
/* stop */
double stoplen = 0;
while (ceiling(ds, current_gf) == depth)
stoplen += add_segment_const(ds, depth, 1, gas);
ret.tts += stoplen;
seg_cb(ds, (waypoint_t){.depth = depth, .time = stoplen, .gas = gas}, SEG_DECO_STOP);
}
return ret;
}
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