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Fix invalid bailout gas choice when planning a CCR dive.

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Fixes a bug reported in
https://groups.google.com/g/subsurface-divelog/c/8N3cTz2Zv5E:
When planning a CCR dive with OC bailout, the diluent gas may be chosen
as the first OC bailout gas, despite being set up with a use type of
'diluent', and likely not being available for open circuit breathing.
`best_first_ascend_cylinder` is now initialised to an invalid value
(instead of the first cylinder, which may or may not be a diluent
 cylinder), and its subsequent use is guarded by a validity check.

Signed-off-by: Michael Keller <github@ike.ch>
This commit is contained in:
Michael Keller 2023-02-16 15:53:17 +13:00 • committed by Robert C. Helling
parent eb5d4f2a15
commit ec0c6833a0
4 changed files with 91 additions and 9 deletions

1
CHANGELOG.md
View file

@ -1,3 +1,4 @@
desktop: fix bug in bailout gas selection for CCR dives
desktop: fix crash on cylinder update of multiple dives
desktop: use dynamic tank use drop down in equipment tab and planner
desktop: fix brightness configuration for OSTC4

19
core/planner.c
View file

@ -405,7 +405,7 @@ static struct gaschanges *analyze_gaslist(struct diveplan *diveplan, struct dive
int nr = 0;
struct gaschanges *gaschanges = NULL;
struct divedatapoint *dp = diveplan->dp;
int best_depth = get_cylinder(dive, *asc_cylinder)->depth.mm;
struct divedatapoint *best_ascent_dp = NULL;
bool total_time_zero = true;
while (dp) {
if (dp->time == 0 && total_time_zero && (ccr == (bool) setpoint_change(dive, dp->cylinderid))) {
@ -425,9 +425,8 @@ static struct gaschanges *analyze_gaslist(struct diveplan *diveplan, struct dive
assert(gaschanges[i].gasidx != -1);
} else {
/* is there a better mix to start deco? */
if (dp->depth.mm < best_depth) {
best_depth = dp->depth.mm;
*asc_cylinder = dp->cylinderid;
if (!best_ascent_dp || dp->depth.mm < best_ascent_dp->depth.mm) {
best_ascent_dp = dp;
}
}
} else {
@ -436,6 +435,9 @@ static struct gaschanges *analyze_gaslist(struct diveplan *diveplan, struct dive
dp = dp->next;
}
*gaschangenr = nr;
if (best_ascent_dp) {
*asc_cylinder = best_ascent_dp->cylinderid;
}
#if DEBUG_PLAN & 16
for (nr = 0; nr < *gaschangenr; nr++) {
int idx = gaschanges[nr].gasidx;
@ -678,7 +680,7 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
int clock, previous_point_time;
int avg_depth, max_depth;
int last_ascend_rate;
int best_first_ascend_cylinder;
int best_first_ascend_cylinder = -1;
struct gasmix gas, bottom_gas;
bool o2break_next = false;
int break_cylinder = -1, breakfrom_cylinder = 0;
@ -752,7 +754,6 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
printf("current_cylinder %i\n", current_cylinder);
#endif
best_first_ascend_cylinder = current_cylinder;
/* Find the gases available for deco */
gaschanges = analyze_gaslist(diveplan, dive, &gaschangenr, depth, &best_first_ascend_cylinder, divemode == CCR && !prefs.dobailout);
@ -827,7 +828,7 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
return false;
}
if (best_first_ascend_cylinder != current_cylinder) {
if (best_first_ascend_cylinder != -1 && best_first_ascend_cylinder != current_cylinder) {
current_cylinder = best_first_ascend_cylinder;
gas = get_cylinder(dive, current_cylinder)->gasmix;
@ -886,7 +887,7 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
last_ascend_rate = ascent_velocity(depth, avg_depth, bottom_time);
/* Always prefer the best_first_ascend_cylinder if it has the right gasmix.
* Otherwise take first cylinder from list with rightgasmix */
if (same_gasmix(gas, get_cylinder(dive, best_first_ascend_cylinder)->gasmix))
if (best_first_ascend_cylinder != -1 && same_gasmix(gas, get_cylinder(dive, best_first_ascend_cylinder)->gasmix))
current_cylinder = best_first_ascend_cylinder;
else
current_cylinder = get_gasidx(dive, gas);
@ -1032,7 +1033,7 @@ bool plan(struct deco_state *ds, struct diveplan *diveplan, struct dive *dive, i
* backgas. This could be customized if there were demand.
*/
if (break_cylinder == -1) {
if (get_o2(get_cylinder(dive, best_first_ascend_cylinder)->gasmix) <= 320)
if (best_first_ascend_cylinder != -1 && get_o2(get_cylinder(dive, best_first_ascend_cylinder)->gasmix) <= 320)
break_cylinder = best_first_ascend_cylinder;
else
break_cylinder = 0;

79
tests/testplan.cpp
View file

@ -372,6 +372,39 @@ void setupPlanSeveralGases(struct diveplan *dp)
plan_add_segment(dp, 5 * 60, 10000, 0, 0, true, OC);
}
void setupPlanCcr(struct diveplan *dp)
{
dp->salinity = 10300;
dp->surface_pressure = 1013;
dp->gflow = 50;
dp->gfhigh = 70;
dp->bottomsac = prefs.bottomsac;
dp->decosac = prefs.decosac;
pressure_t po2 = {1600};
struct gasmix diluent = {{200}, {210}};
struct gasmix ean53 = {{530}, {0}};
struct gasmix tx19_33 = {{190}, {330}};
cylinder_t *cyl0 = get_or_create_cylinder(&displayed_dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&displayed_dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&displayed_dive, 2);
cyl0->gasmix = diluent;
cyl0->depth = gas_mod(diluent, po2, &displayed_dive, M_OR_FT(3, 10));
cyl0->type.size.mliter = 3000;
cyl0->type.workingpressure.mbar = 200000;
cyl0->cylinder_use = DILUENT;
cyl1->gasmix = ean53;
cyl1->depth = gas_mod(ean53, po2, &displayed_dive, M_OR_FT(3, 10));
cyl2->gasmix = tx19_33;
cyl2->depth = gas_mod(tx19_33, po2, &displayed_dive, M_OR_FT(3, 10));
reset_cylinders(&displayed_dive, true);
free_dps(dp);
plan_add_segment(dp, 0, cyl1->depth.mm, 1, 0, false, OC);
plan_add_segment(dp, 0, cyl2->depth.mm, 2, 0, false, OC);
plan_add_segment(dp, 20 * 60, M_OR_FT(60, 197), 0, 1300, true, CCR);
}
/* We compare the calculated runtimes against two values:
* - Known runtime calculated by Subsurface previously (to detect if anything has changed)
* - Benchmark runtime (we should be close, but not always exactly the same)
@ -885,4 +918,50 @@ void TestPlan::testVpmbMetricRepeat()
QCOMPARE(finalDiveRunTimeSeconds, firstDiveRunTimeSeconds);
}
// Test that the correct gases are selected during a CCR dive with bailout ascent
// Includes a regression test for https://groups.google.com/g/subsurface-divelog/c/8N3cTz2Zv5E
void TestPlan::testCcrBailoutGasSelection()
{
struct deco_state *cache = NULL;
setupPrefs();
prefs.unit_system = METRIC;
prefs.units.length = units::METERS;
prefs.planner_deco_mode = BUEHLMANN;
displayed_dive.dc.divemode = CCR;
prefs.dobailout = true;
struct diveplan testPlan = {};
setupPlanCcr(&testPlan);
plan(&test_deco_state, &testPlan, &displayed_dive, 60, stoptable, &cache, true, false);
#if DEBUG
free(displayed_dive.notes);
displayed_dive.notes = NULL;
save_dive(stdout, &displayed_dive, false);
#endif
// check diluent used
cylinder_t *cylinder = get_cylinder(&displayed_dive, get_cylinderid_at_time(&displayed_dive, &displayed_dive.dc, { 20 * 60 - 1 }));
QCOMPARE(cylinder->cylinder_use, DILUENT);
QCOMPARE(get_o2(cylinder->gasmix), 200);
// check deep bailout used
cylinder = get_cylinder(&displayed_dive, get_cylinderid_at_time(&displayed_dive, &displayed_dive.dc, { 20 * 60 + 1 }));
QCOMPARE(cylinder->cylinder_use, OC_GAS);
QCOMPARE(get_o2(cylinder->gasmix), 190);
// check shallow bailout used
cylinder = get_cylinder(&displayed_dive, get_cylinderid_at_time(&displayed_dive, &displayed_dive.dc, { 30 * 60 }));
QCOMPARE(cylinder->cylinder_use, OC_GAS);
QCOMPARE(get_o2(cylinder->gasmix), 530);
// check expected run time of 51 minutes
QVERIFY(compareDecoTime(displayed_dive.dc.duration.seconds, 51 * 60, 51 * 60));
}
QTEST_GUILESS_MAIN(TestPlan)

1
tests/testplan.h
View file

@ -19,6 +19,7 @@ private slots:
void testVpmbMetric100m10min();
void testVpmbMetricRepeat();
void testMultipleGases();
void testCcrBailoutGasSelection();
};
#endif // TESTPLAN_H