Aaaa

code/__DEFINES/atmospherics.dm

@@ -265,7 +265,9 @@
 #define GAS_METHANE				"methane"
 #define GAS_METHYL_BROMIDE		"methyl_bromide"
 
-#define GAS_FLAG_DANGEROUS (1<<0)
+#define GAS_FLAG_DANGEROUS		(1<<0)
+#define GAS_FLAG_BREATH_PROC	(1<<1)
+
 //HELPERS
 #define PIPING_LAYER_SHIFT(T, PipingLayer) \
 	if(T.dir & (NORTH|SOUTH)) {									\

code/__DEFINES/maths.dm

@@ -212,12 +212,17 @@
 /// Like DT_PROB_RATE but easier to use, simply put `if(DT_PROB(10, 5))`
 #define DT_PROB(prob_per_second_percent, delta_time) (prob(100*DT_PROB_RATE((prob_per_second_percent)/100, (delta_time))))
 // )
-
+/// Taxicab distance--gets you the **actual** time it takes to get from one turf to another due to how we calculate diagonal movement
 #define MANHATTAN_DISTANCE(a, b) (abs(a.x - b.x) + abs(a.y - b.y))
+// )
 
+/// A function that exponentially approaches a maximum value of L
+/// k is the rate at which is approaches L, x_0 is the point where the function = 0
 #define LOGISTIC_FUNCTION(L,k,x,x_0) (L/(1+(NUM_E**(-k*(x-x_0)))))
-
+// )
 /// Make sure something is a boolean TRUE/FALSE 1/0 value, since things like bitfield & bitflag doesn't always give 1s and 0s.
 #define FORCE_BOOLEAN(x) ((x)? TRUE : FALSE)
-
+// )
+/// Gives the number of pixels in an orthogonal line of tiles.
 #define TILES_TO_PIXELS(tiles)			(tiles * PIXELS)
+// )

code/__DEFINES/mobs.dm

@@ -345,5 +345,5 @@
 #define SPAWN_MEGAFAUNA "bluh bluh huge boss"
 
 // / Breathing types. Lungs can access either by these or by a string, which will be considered a gas ID.
-#define BREATH_OXY		0
-#define BREATH_PLASMA	1
+#define BREATH_OXY		/datum/breathing_class/oxygen
+#define BREATH_PLASMA	/datum/breathing_class/plasma