VPM-B: add vpm-b based deco checking.

Check during the trial_ascent() if existing pressure gradient is
smaller than previously calculated max gradient. If not, ascent
is impossible from the vpm-b's point of view.

Signed-off-by: Jan Darowski <jan.darowski@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/deco.c b/deco.c
index ada13fbb0..47b752ee8 100644
--- a/deco.c
+++ b/deco.c
@@ -210,6 +210,21 @@ double he_factor(int period_in_seconds, int ci)
 	return cache[ci].last_factor;
 }
 
+bool is_vpmb_ok(double pressure)
+{
+	int ci;
+	double gradient;
+	double gas_tension;
+
+	for (ci = 0; ci < 16; ++ci) {
+		gas_tension = tissue_n2_sat[ci] + tissue_he_sat[ci] + vpmb_config.other_gases_pressure;
+		gradient = gas_tension - pressure;
+		if (gradient > total_gradient[ci])
+			return false;
+	}
+	return true;
+}
+
 void vpmb_start_gradient()
 {
 	int ci;