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741099bdbb
When collecting the data for the infobox, we have already computed the current partial pressures of the breathing gas taking into accoutn the divemode. Use those rather than fractions (which for CCR mode are those of diluent) to compute the gas density. Reported-by: Pietro Tranquillini <p.tranquillini@gmail.com> Signed-off-by: Robert C. Helling <helling@atdotde.de>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
// 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 "divemode.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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enum gas_component { N2, HE, O2 };
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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 gastype {
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GASTYPE_AIR,
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GASTYPE_NITROX,
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GASTYPE_HYPOXIC_TRIMIX,
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GASTYPE_NORMOXIC_TRIMIX,
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GASTYPE_HYPEROXIC_TRIMIX,
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GASTYPE_OXYGEN,
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GASTYPE_COUNT
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};
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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);
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extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
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extern int same_gasmix(struct gasmix a, struct gasmix b);
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static inline int get_o2(const 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(const struct gasmix mix)
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{
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return mix.he.permille;
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}
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static inline int get_n2(struct gasmix mix)
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{
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return 1000 - get_o2(mix) - get_he(mix);
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}
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int pscr_o2(const double amb_pressure, struct gasmix mix);
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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 sanitize_gasmix(struct gasmix *mix);
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extern int gasmix_distance(struct gasmix a, struct gasmix b);
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extern fraction_t get_gas_component_fraction(struct gasmix mix, enum gas_component component);
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extern void fill_pressures(struct gas_pressures *pressures, double amb_pressure, struct gasmix mix, double po2, enum divemode_t dctype);
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extern bool gasmix_is_air(struct gasmix gasmix);
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extern bool gasmix_is_invalid(struct gasmix mix);
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extern enum gastype gasmix_to_type(struct gasmix mix);
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extern const char *gastype_name(enum gastype type);
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extern fraction_t make_fraction(int f);
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#ifdef __cplusplus
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}
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#endif
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#endif
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