Static World Gen and Display for the Overworld (#5)

Co-authored-by: luckyturtledev <git@lukas1818.de>
Reviewed-on: #5
Co-authored-by: Dominic <git@msrd0.de>
Co-committed-by: Dominic <git@msrd0.de>

src/game.rs

@@ -1,18 +1,40 @@
-use comfy::*;
-
 use crate::{
 	activities::{house, overworld, Activity},
 	State
 };
+use comfy::EngineContext;
+use std::ops::Sub;
 
-pub fn update(state: &mut State, engine: &mut EngineContext) {
+#[repr(i32)]
+pub enum ZLayer {
+	MapMax = -1,
+	Human = 0,
+	Ghost = 1
+}
+
+impl From<ZLayer> for i32 {
+	fn from(value: ZLayer) -> Self {
+		// safe because #[repr(i32)]
+		value as i32
+	}
+}
+
+impl Sub<i32> for ZLayer {
+	type Output = i32;
+
+	fn sub(self, other: i32) -> Self::Output {
+		i32::from(self) - other
+	}
+}
+
+pub fn update(state: &mut State, engine: &mut EngineContext<'_>) {
 	match state.activity {
 		Activity::House => house::update(state, engine),
 		Activity::Overworld => overworld::update(state, engine)
 	}
 }
 
-pub fn draw(state: &State, engine: &EngineContext) {
+pub fn draw(state: &State, engine: &EngineContext<'_>) {
 	match state.activity {
 		Activity::House => house::draw(state, engine),
 		Activity::Overworld => overworld::draw(state, engine)