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Break up calculate_deco_information

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Break the huge calculate_deco_information into three different functions.
One for the current deco calculations, one for the ndl/tts/deco stop and
one for the gas calculations.
This makes it easier to disable/enable different functionality.

This also gets rid if the ccrdive state variable, and keeps that state
in the plot_data struct. Now we calculate the deco before we calculate
the gas properties, so if we have a po2, we're in ccr-mode, and if we
don't, we're in oc mode.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Anton Lundin 2013-11-12 23:09:59 +01:00 • committed by Dirk Hohndel
parent fc2c55dabd
commit c58dc29542
1 changed files with 115 additions and 112 deletions
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227
profile.c
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@ -934,15 +934,123 @@ static void populate_pressure_information(struct dive *dive, struct divecomputer
list_free(track_pr[i]);
}
/* calculate DECO STOP / TTS / NDL */
static void calculate_ndl_tts(double tissue_tolerance, struct plot_data *entry, struct dive *dive, double surface_pressure) {
/* FIXME: This should be configurable */
/* ascent speed up to first deco stop */
const int ascent_s_per_step = 1;
const int ascent_mm_per_step = 200; /* 12 m/min */
/* ascent speed between deco stops */
const int ascent_s_per_deco_step = 1;
const int ascent_mm_per_deco_step = 16; /* 1 m/min */
/* how long time steps in deco calculations? */
const int time_stepsize = 10;
const int deco_stepsize = 3000;
/* at what depth is the current deco-step? */
int next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1), deco_stepsize);
int ascent_depth = entry->depth;
/* at what time should we give up and say that we got enuff NDL? */
const int max_ndl = 7200;
int cylinderindex = entry->cylinderindex;
/* If we don't have a ceiling yet, calculate ndl. Don't try to calculate
* a ndl for lower values than 3m it would take forever */
if (next_stop == 0) {
if(entry->depth < 3000) {
entry->ndl = max_ndl;
return;
}
/* stop if the ndl is above max_ndl seconds, and call it plenty of time */
while (entry->ndl < max_ndl && deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1) <= 0) {
entry->ndl += time_stepsize;
tissue_tolerance = add_segment(depth_to_mbar(entry->depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, time_stepsize, entry->po2 * 1000, dive);
}
/* we don't need to calculate anything else */
return;
}
/* Add segments for movement to stopdepth */
for (; ascent_depth > next_stop; ascent_depth -= ascent_mm_per_step, entry->tts += ascent_s_per_step) {
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_step, entry->po2 * 1000, dive);
next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1), deco_stepsize);
}
ascent_depth = next_stop;
/* And how long is the current deco-step? */
entry->stoptime = 0;
entry->stopdepth = next_stop;
next_stop -= deco_stepsize;
/* And how long is the total TTS */
while(next_stop >= 0) {
/* save the time for the first stop to show in the graph */
if (ascent_depth == entry->stopdepth)
entry->stoptime += time_stepsize;
entry->tts += time_stepsize;
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, time_stepsize, entry->po2 * 1000, dive);
if (deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1) <= next_stop) {
/* move to the next stop and add the travel between stops */
for (; ascent_depth > next_stop ; ascent_depth -= ascent_mm_per_deco_step, entry->tts += ascent_s_per_deco_step)
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_deco_step, entry->po2 * 1000, dive);
ascent_depth = next_stop;
next_stop -= deco_stepsize;
}
}
}
/* Let's try to do some deco calculations.
* Needs to be run before calculate_gas_information so we know that if we have a po2, where in ccr-mode.
*/
static void calculate_deco_information(struct dive *dive, struct divecomputer *dc, struct plot_info *pi)
{
int i;
double amb_pressure;
double surface_pressure = (dc->surface_pressure.mbar ? dc->surface_pressure.mbar : get_surface_pressure_in_mbar(dive, TRUE)) / 1000.0;
double tissue_tolerance = 0;
for (i = 1; i < pi->nr; i++) {
struct plot_data *entry = pi->entry + i;
int j, t0 = (entry - 1)->sec, t1 = entry->sec;
for (j = t0+1; j <= t1; j++) {
int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0);
double min_pressure = add_segment(depth_to_mbar(depth, dive) / 1000.0,
&dive->cylinder[entry->cylinderindex].gasmix, 1, entry->po2 * 1000, dive);
tissue_tolerance = min_pressure;
}
if (t0 == t1)
entry->ceiling = (entry - 1)->ceiling;
else
entry->ceiling = deco_allowed_depth(tissue_tolerance, surface_pressure, dive, !prefs.calc_ceiling_3m_incr);
for (j=0; j<16; j++)
entry->ceilings[j] = deco_allowed_depth(tolerated_by_tissue[j], surface_pressure, dive, 1);
/* should we do more calculations? */
if (prefs.calc_ndl_tts) {
/* We are going to mess up deco state, so store it for later restore */
char *cache_data = NULL;
cache_deco_state(tissue_tolerance, &cache_data);
calculate_ndl_tts(tissue_tolerance, entry, dive, surface_pressure);
/* Restore "real" deco state for next real time step */
tissue_tolerance = restore_deco_state(cache_data);
free(cache_data);
}
}
#if DECO_CALC_DEBUG & 1
dump_tissues();
#endif
}
static void calculate_gas_information(struct dive *dive, struct plot_info *pi)
{
int i;
double amb_pressure;
for (i = 1; i < pi->nr; i++) {
int fo2, fhe, j, k, t0, t1;
double tissue_tolerance;
int fo2, fhe;
struct plot_data *entry = pi->entry + i;
int cylinderindex = entry->cylinderindex;
@ -950,14 +1058,12 @@ static void calculate_deco_information(struct dive *dive, struct divecomputer *d
fo2 = get_o2(&dive->cylinder[cylinderindex].gasmix);
fhe = get_he(&dive->cylinder[cylinderindex].gasmix);
double ratio = (double)fhe / (1000.0 - fo2);
int ccrdive = 0;
if (entry->po2) {
/* we have an O2 partial pressure in the sample - so this
* is likely a CC dive... use that instead of the value
* from the cylinder info */
double po2 = entry->po2 > amb_pressure ? amb_pressure : entry->po2;
ccrdive = 1;
entry->po2 = po2;
entry->phe = (amb_pressure - po2) * ratio;
entry->pn2 = amb_pressure - po2 - entry->phe;
@ -995,113 +1101,7 @@ static void calculate_deco_information(struct dive *dive, struct divecomputer *d
pi->maxpp = entry->phe;
if (entry->pn2 > pi->maxpp && prefs.pp_graphs.pn2)
pi->maxpp = entry->pn2;
/* and now let's try to do some deco calculations */
t0 = (entry - 1)->sec;
t1 = entry->sec;
tissue_tolerance = 0;
for (j = t0+1; j <= t1; j++) {
int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0);
double min_pressure = add_segment(depth_to_mbar(depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, 1, ccrdive ? entry->po2 * 1000 : 0, dive);
tissue_tolerance = min_pressure;
}
if (t0 == t1)
entry->ceiling = (entry - 1)->ceiling;
else
entry->ceiling = deco_allowed_depth(tissue_tolerance, surface_pressure, dive, !prefs.calc_ceiling_3m_incr);
for (k=0; k<16; k++)
entry->ceilings[k] = deco_allowed_depth(tolerated_by_tissue[k], surface_pressure, dive, 1);
/* calculate DECO STOP / TTS / NDL */
/* bail if we shouldn't */
if (!prefs.calc_ndl_tts)
continue;
/* We are going to mess up deco state, so store it for later restore */
char *cache_data = NULL;
cache_deco_state(tissue_tolerance, &cache_data);
/* should we calculate a stop depth and time or have dc already done that? */
if (entry->ceiling && !entry->stopdepth) {
/* FIXME: This should be configurable */
/* ascent speed up to first deco stop */
const int ascent_s_per_step = 1;
const int ascent_mm_per_step = 200; /* 12 m/min */
/* ascent speed between deco stops */
const int ascent_s_per_deco_step = 1;
const int ascent_mm_per_deco_step = 16; /* 1 m/min */
/* how long time steps in deco calculations? */
const int time_stepsize = 10;
const int deco_stepsize = 3000;
/* at what depth is the current deco-step? */
int next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1), deco_stepsize);
int ascent_depth = entry->depth;
entry->tts = 0;
/* Add segments for movement to stopdepth */
for (; ascent_depth > next_stop; ascent_depth -= ascent_mm_per_step, entry->tts += ascent_s_per_step) {
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_step, ccrdive ? entry->po2 * 1000 : 0, dive);
next_stop = ROUND_UP(deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1), deco_stepsize);
}
ascent_depth = next_stop;
/* And how long is the current deco-step? */
entry->stoptime = 0;
entry->stopdepth = next_stop;
next_stop -= deco_stepsize;
/* And how long is the total TTS */
while(next_stop >= 0) {
/* save the time for the first stop to show in the graph */
if (ascent_depth == entry->stopdepth)
entry->stoptime += time_stepsize;
entry->tts += time_stepsize;
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, time_stepsize, ccrdive ? entry->po2 * 1000 : 0, dive);
if (deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1) <= next_stop) {
/* move to the next stop and add the travel between stops */
for (; ascent_depth > next_stop ; ascent_depth -= ascent_mm_per_deco_step, entry->tts += ascent_s_per_deco_step)
tissue_tolerance = add_segment(depth_to_mbar(ascent_depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, ascent_s_per_deco_step, ccrdive ? entry->po2 * 1000 : 0, dive);
ascent_depth = next_stop;
next_stop -= deco_stepsize;
}
}
} else if (!entry->ndl) {
/* FIXME: This should be configurable */
const int time_stepsize = 60;
const int max_ndl = 7200;
entry->ndl = max_ndl;
pi->has_ndl = TRUE;
/* don't try to calculate a ndl for lower values than 3m
* it would take forever */
if (entry->depth > 3000) {
entry->ndl = 0;
/* stop if the ndl is above max_ndl seconds, and call it plenty of time */
while (entry->ndl < max_ndl && deco_allowed_depth(tissue_tolerance, surface_pressure, dive, 1) <= 0) {
entry->ndl += time_stepsize;
tissue_tolerance = add_segment(depth_to_mbar(entry->depth, dive) / 1000.0,
&dive->cylinder[cylinderindex].gasmix, time_stepsize, ccrdive ? entry->po2 * 1000 : 0, dive);
}
}
}
/* Restore "real" deco state for next real time step */
if (cache_data) {
tissue_tolerance = restore_deco_state(cache_data);
free(cache_data);
}
}
#if DECO_CALC_DEBUG & 1
dump_tissues();
#endif
}
/*
@ -1139,10 +1139,13 @@ struct plot_info *create_plot_info(struct dive *dive, struct divecomputer *dc, s
/* Calculate sac */
calculate_sac(dive, pi);
/* Then, calculate partial pressures and deco information */
/* Then, calculate deco information */
if (prefs.profile_calc_ceiling)
calculate_deco_information(dive, dc, pi);
/* And finaly calculate gas partial pressures */
calculate_gas_information(dive, pi);
pi->meandepth = dive->dc.meandepth.mm;
if (0) /* awesome for debugging - not useful otherwise */