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Cleanup: move gas-functions to own translation unit
But only functions that operate only on gases. Functions concerning cylinders or dives remain in dive.c or are moved to equipment.c Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger
Dirk Hohndel
parent
8352274758
commit
619d3fb1fd
8 changed files with 174 additions and 149 deletions
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@ -86,6 +86,8 @@ set(SUBSURFACE_CORE_LIB_SRCS
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file.h
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format.cpp
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format.h
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gas.c
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gas.h
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gas-model.c
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gaspressures.c
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gaspressures.h
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106
core/dive.c
106
core/dive.c
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@ -866,13 +866,6 @@ static void update_min_max_temperatures(struct dive *dive, temperature_t tempera
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}
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}
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int gas_volume(const cylinder_t *cyl, pressure_t p)
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{
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double bar = p.mbar / 1000.0;
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double z_factor = gas_compressibility_factor(cyl->gasmix, bar);
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return lrint(cyl->type.size.mliter * bar_to_atm(bar) / z_factor);
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}
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/*
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* If the cylinder tank pressures are within half a bar
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* (about 8 PSI) of the sample pressures, we consider it
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@ -948,31 +941,6 @@ void update_setpoint_events(const struct dive *dive, struct divecomputer *dc)
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}
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}
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void sanitize_gasmix(struct gasmix *mix)
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{
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unsigned int o2, he;
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o2 = mix->o2.permille;
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he = mix->he.permille;
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/* Regular air: leave empty */
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if (!he) {
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if (!o2)
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return;
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/* 20.8% to 21% O2 is just air */
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if (gasmix_is_air(*mix)) {
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mix->o2.permille = 0;
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return;
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}
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}
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/* Sane mix? */
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if (o2 <= 1000 && he <= 1000 && o2 + he <= 1000)
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return;
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fprintf(stderr, "Odd gasmix: %u O2 %u He\n", o2, he);
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memset(mix, 0, sizeof(*mix));
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}
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/*
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* See if the size/workingpressure looks like some standard cylinder
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* size, eg "AL80".
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@ -1059,23 +1027,6 @@ static void sanitize_cylinder_info(struct dive *dive)
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}
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}
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/* Perform isobaric counterdiffusion calculations for gas changes in trimix dives.
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* Here we use the rule-of-fifths where, during a change involving trimix gas, the increase in nitrogen
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* should not exceed one fifth of the decrease in helium.
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* Parameters: 1) pointers to two gas mixes, the gas being switched from and the gas being switched to.
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* 2) a pointer to an icd_data structure.
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* Output: i) The icd_data stucture is filled with the delta_N2 and delta_He numbers (as permille).
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* ii) Function returns a boolean indicating an exceeding of the rule-of-fifths. False = no icd problem.
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*/
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bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results)
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{
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if (!prefs.show_icd)
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return false;
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results->dN2 = get_he(oldgasmix) + get_o2(oldgasmix) - get_he(newgasmix) - get_o2(newgasmix);
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results->dHe = get_he(newgasmix) - get_he(oldgasmix);
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return get_he(oldgasmix) > 0 && results->dN2 > 0 && results->dHe < 0 && get_he(oldgasmix) && results->dN2 > 0 && 5 * results->dN2 > -results->dHe;
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}
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/* some events should never be thrown away */
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static bool is_potentially_redundant(const struct event *event)
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{
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@ -1464,29 +1415,6 @@ static void fixup_dive_pressures(struct dive *dive, struct divecomputer *dc)
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simplify_dc_pressures(dc);
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}
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int find_best_gasmix_match(struct gasmix mix, const cylinder_t array[], unsigned int used)
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{
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int i;
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int best = -1, score = INT_MAX;
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for (i = 0; i < MAX_CYLINDERS; i++) {
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const cylinder_t *match;
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int distance;
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if (used & (1 << i))
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continue;
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match = array + i;
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if (cylinder_nodata(match))
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continue;
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distance = gasmix_distance(mix, match->gasmix);
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if (distance >= score)
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continue;
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best = i;
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score = distance;
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}
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return best;
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}
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/*
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* Match a gas change event against the cylinders we have
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*/
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@ -2031,17 +1959,6 @@ extern int get_cylinder_idx_by_use(const struct dive *dive, enum cylinderuse cyl
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return -1; // negative number means cylinder_use_type not found in list of cylinders
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}
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int gasmix_distance(struct gasmix a, struct gasmix b)
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{
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int a_o2 = get_o2(a), b_o2 = get_o2(b);
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int a_he = get_he(a), b_he = get_he(b);
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int delta_o2 = a_o2 - b_o2, delta_he = a_he - b_he;
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delta_he = delta_he * delta_he;
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delta_o2 = delta_o2 * delta_o2;
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return delta_he + delta_o2;
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}
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/* fill_pressures(): Compute partial gas pressures in bar from gasmix and ambient pressures, possibly for OC or CCR, to be
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* extended to PSCT. This function does the calculations of gas pressures applicable to a single point on the dive profile.
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* The structure "pressures" is used to return calculated gas pressures to the calling software.
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@ -2052,7 +1969,7 @@ int gasmix_distance(struct gasmix a, struct gasmix b)
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* divemode = the dive mode pertaining to this point in the dive profile.
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* This function called by: calculate_gas_information_new() in profile.c; add_segment() in deco.c.
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*/
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extern void fill_pressures(struct gas_pressures *pressures, const double amb_pressure, struct gasmix mix, double po2, enum divemode_t divemode)
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void fill_pressures(struct gas_pressures *pressures, const double amb_pressure, struct gasmix mix, double po2, enum divemode_t divemode)
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{
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if ((divemode != OC) && po2) { // This is a rebreather dive where pressures->o2 is defined
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if (po2 >= amb_pressure) {
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@ -2180,20 +2097,6 @@ void cylinder_renumber(struct dive *dive, int mapping[])
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dc_cylinder_renumber(dive, dc, mapping);
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}
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static bool gasmix_is_invalid(struct gasmix mix)
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{
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return mix.o2.permille < 0;
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}
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int same_gasmix(struct gasmix a, struct gasmix b)
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{
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if (gasmix_is_invalid(a) || gasmix_is_invalid(b))
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return 0;
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if (gasmix_is_air(a) && gasmix_is_air(b))
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return 1;
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return a.o2.permille == b.o2.permille && a.he.permille == b.he.permille;
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}
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int same_gasmix_cylinder(cylinder_t *cyl, int cylid, struct dive *dive, bool check_unused)
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{
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struct gasmix mygas = cyl->gasmix;
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@ -3922,13 +3825,6 @@ fraction_t best_he(depth_t depth, const struct dive *dive)
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return fhe;
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}
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bool gasmix_is_air(struct gasmix gasmix)
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{
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int o2 = gasmix.o2.permille;
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int he = gasmix.he.permille;
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return (he == 0) && (o2 == 0 || ((o2 >= O2_IN_AIR - 1) && (o2 <= O2_IN_AIR + 1)));
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}
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void invalidate_dive_cache(struct dive *dive)
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{
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memset(dive->git_id, 0, 20);
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34
core/dive.h
34
core/dive.h
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@ -27,13 +27,6 @@ extern const char *cylinderuse_text[];
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extern const char *divemode_text_ui[];
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extern const char *divemode_text[];
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struct icd_data { // This structure provides communication between function isobaric_counterdiffusion() and the calling software.
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int dN2; // The change in fraction (permille) of nitrogen during the change
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int dHe; // The change in fraction (permille) of helium during the change
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};
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extern bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results);
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/*
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* Events are currently based straight on what libdivecomputer gives us.
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* We need to wrap these into our own events at some point to remove some of the limitations.
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@ -63,35 +56,8 @@ struct event {
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extern int event_is_gaschange(const struct event *ev);
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/* Volume in mliter of a cylinder at pressure 'p' */
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extern int gas_volume(const cylinder_t *cyl, pressure_t p);
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extern double gas_compressibility_factor(struct gasmix gas, double bar);
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extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
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extern double gas_density(struct gasmix gas, int pressure);
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extern int same_gasmix(struct gasmix a, struct gasmix b);
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static inline int get_o2(struct gasmix mix)
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{
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return mix.o2.permille ?: O2_IN_AIR;
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}
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static inline int get_he(struct gasmix mix)
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{
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return mix.he.permille;
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}
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struct gas_pressures {
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double o2, n2, he;
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};
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extern void fill_pressures(struct gas_pressures *pressures, const double amb_pressure, struct gasmix mix, double po2, enum divemode_t dctype);
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extern void sanitize_gasmix(struct gasmix *mix);
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extern int gasmix_distance(struct gasmix a, struct gasmix b);
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extern int find_best_gasmix_match(struct gasmix mix, const cylinder_t array[], unsigned int used);
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extern bool gasmix_is_air(struct gasmix gasmix);
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/* Linear interpolation between 'a' and 'b', when we are 'part'way into the 'whole' distance from a to b */
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static inline int interpolate(int a, int b, int part, int whole)
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{
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@ -10,6 +10,7 @@
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#include <stdlib.h>
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#include <stdarg.h>
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#include <time.h>
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#include <limits.h>
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#include "equipment.h"
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#include "gettext.h"
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#include "dive.h"
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@ -101,6 +102,36 @@ const char *gasname(struct gasmix gasmix)
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return gas;
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}
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int gas_volume(const cylinder_t *cyl, pressure_t p)
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{
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double bar = p.mbar / 1000.0;
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double z_factor = gas_compressibility_factor(cyl->gasmix, bar);
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return lrint(cyl->type.size.mliter * bar_to_atm(bar) / z_factor);
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}
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int find_best_gasmix_match(struct gasmix mix, const cylinder_t array[], unsigned int used)
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{
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int i;
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int best = -1, score = INT_MAX;
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for (i = 0; i < MAX_CYLINDERS; i++) {
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const cylinder_t *match;
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int distance;
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if (used & (1 << i))
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continue;
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match = array + i;
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if (cylinder_nodata(match))
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continue;
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distance = gasmix_distance(mix, match->gasmix);
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if (distance >= score)
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continue;
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best = i;
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score = distance;
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}
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return best;
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}
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bool weightsystem_none(const weightsystem_t *ws)
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{
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return !ws->weight.grams && !ws->description;
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@ -2,7 +2,7 @@
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#ifndef EQUIPMENT_H
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#define EQUIPMENT_H
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#include "units.h"
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#include "gas.h"
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#ifdef __cplusplus
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extern "C" {
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@ -10,15 +10,6 @@ extern "C" {
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struct dive;
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// o2 == 0 && he == 0 -> air
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// o2 < 0 -> invalid
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struct gasmix {
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fraction_t o2;
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fraction_t he;
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};
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static const struct gasmix gasmix_invalid = { { -1 }, { -1 } };
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static const struct gasmix gasmix_air = { { 0 }, { 0 } };
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enum cylinderuse {OC_GAS, DILUENT, OXYGEN, NOT_USED, NUM_GAS_USE}; // The different uses for cylinders
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typedef struct
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@ -63,6 +54,8 @@ extern bool weightsystem_none(const weightsystem_t *ws);
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extern void remove_cylinder(struct dive *dive, int idx);
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extern void remove_weightsystem(struct dive *dive, int idx);
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extern void reset_cylinders(struct dive *dive, bool track_gas);
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extern int gas_volume(const cylinder_t *cyl, pressure_t p); /* Volume in mliter of a cylinder at pressure 'p' */
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extern int find_best_gasmix_match(struct gasmix mix, const cylinder_t array[], unsigned int used);
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#ifdef DEBUG_CYL
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extern void dump_cylinders(struct dive *dive, bool verbose);
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#endif
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79
core/gas.c
Normal file
79
core/gas.c
Normal file
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@ -0,0 +1,79 @@
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// SPDX-License-Identifier: GPL-2.0
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#include "gas.h"
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#include "pref.h"
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#include <stdio.h>
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#include <string.h>
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/* Perform isobaric counterdiffusion calculations for gas changes in trimix dives.
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* Here we use the rule-of-fifths where, during a change involving trimix gas, the increase in nitrogen
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* should not exceed one fifth of the decrease in helium.
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* Parameters: 1) pointers to two gas mixes, the gas being switched from and the gas being switched to.
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* 2) a pointer to an icd_data structure.
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* Output: i) The icd_data stucture is filled with the delta_N2 and delta_He numbers (as permille).
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* ii) Function returns a boolean indicating an exceeding of the rule-of-fifths. False = no icd problem.
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*/
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bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results)
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{
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if (!prefs.show_icd)
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return false;
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results->dN2 = get_he(oldgasmix) + get_o2(oldgasmix) - get_he(newgasmix) - get_o2(newgasmix);
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results->dHe = get_he(newgasmix) - get_he(oldgasmix);
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return get_he(oldgasmix) > 0 && results->dN2 > 0 && results->dHe < 0 && get_he(oldgasmix) && results->dN2 > 0 && 5 * results->dN2 > -results->dHe;
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}
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static bool gasmix_is_invalid(struct gasmix mix)
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{
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return mix.o2.permille < 0;
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}
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int same_gasmix(struct gasmix a, struct gasmix b)
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{
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if (gasmix_is_invalid(a) || gasmix_is_invalid(b))
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return 0;
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if (gasmix_is_air(a) && gasmix_is_air(b))
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return 1;
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return a.o2.permille == b.o2.permille && a.he.permille == b.he.permille;
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}
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void sanitize_gasmix(struct gasmix *mix)
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{
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unsigned int o2, he;
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o2 = mix->o2.permille;
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he = mix->he.permille;
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/* Regular air: leave empty */
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if (!he) {
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if (!o2)
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return;
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/* 20.8% to 21% O2 is just air */
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if (gasmix_is_air(*mix)) {
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mix->o2.permille = 0;
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return;
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}
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}
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/* Sane mix? */
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if (o2 <= 1000 && he <= 1000 && o2 + he <= 1000)
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return;
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fprintf(stderr, "Odd gasmix: %u O2 %u He\n", o2, he);
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memset(mix, 0, sizeof(*mix));
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}
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int gasmix_distance(struct gasmix a, struct gasmix b)
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{
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int a_o2 = get_o2(a), b_o2 = get_o2(b);
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int a_he = get_he(a), b_he = get_he(b);
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int delta_o2 = a_o2 - b_o2, delta_he = a_he - b_he;
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delta_he = delta_he * delta_he;
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delta_o2 = delta_o2 * delta_o2;
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return delta_he + delta_o2;
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}
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bool gasmix_is_air(struct gasmix gasmix)
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{
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int o2 = gasmix.o2.permille;
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int he = gasmix.he.permille;
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return (he == 0) && (o2 == 0 || ((o2 >= O2_IN_AIR - 1) && (o2 <= O2_IN_AIR + 1)));
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}
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57
core/gas.h
Normal file
57
core/gas.h
Normal file
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@ -0,0 +1,57 @@
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// SPDX-License-Identifier: GPL-2.0
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#ifndef GAS_H
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#define GAS_H
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#include "units.h"
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#ifdef __cplusplus
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extern "C" {
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#else
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#include <stdbool.h>
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#endif
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// o2 == 0 && he == 0 -> air
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// o2 < 0 -> invalid
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struct gasmix {
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fraction_t o2;
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fraction_t he;
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};
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static const struct gasmix gasmix_invalid = { { -1 }, { -1 } };
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static const struct gasmix gasmix_air = { { 0 }, { 0 } };
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struct icd_data { // This structure provides communication between function isobaric_counterdiffusion() and the calling software.
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int dN2; // The change in fraction (permille) of nitrogen during the change
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int dHe; // The change in fraction (permille) of helium during the change
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};
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extern bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results);
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extern double gas_compressibility_factor(struct gasmix gas, double bar);
|
||||
extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
|
||||
extern double gas_density(struct gasmix gas, int pressure);
|
||||
extern int same_gasmix(struct gasmix a, struct gasmix b);
|
||||
|
||||
static inline int get_o2(struct gasmix mix)
|
||||
{
|
||||
return mix.o2.permille ?: O2_IN_AIR;
|
||||
}
|
||||
|
||||
static inline int get_he(struct gasmix mix)
|
||||
{
|
||||
return mix.he.permille;
|
||||
}
|
||||
|
||||
struct gas_pressures {
|
||||
double o2, n2, he;
|
||||
};
|
||||
|
||||
extern void sanitize_gasmix(struct gasmix *mix);
|
||||
extern int gasmix_distance(struct gasmix a, struct gasmix b);
|
||||
|
||||
extern bool gasmix_is_air(struct gasmix gasmix);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
|
|
@ -67,6 +67,7 @@ SOURCES += ../../subsurface-mobile-main.cpp \
|
|||
../../core/deco.c \
|
||||
../../core/divesite.c \
|
||||
../../core/equipment.c \
|
||||
../../core/gas.c \
|
||||
../../core/membuffer.c \
|
||||
../../core/sha1.c \
|
||||
../../core/strtod.c \
|
||||
|
|
|
|||
Loading…
Reference in a new issue