Redid the world -> screen funcs.

Had to rework these they were wrong initially.
Added comments to make it clear what I am doing.

src/map.odin

@@ -55,20 +55,41 @@ map_init :: proc() -> Game_Map {
 	}
 }
 
-world_to_grid :: proc(pixel_pos: rl.Vector2, camera: rl.Camera2D) -> Grid_Pos {
-	grid_space := rl.GetScreenToWorld2D(pixel_pos, camera)
-
-	// @TODO: I wonder if this floor and casting is expensive, look for a smarter way later
-	pos_x := int(math.floor(grid_space.x))
-	pos_y := int(math.floor(grid_space.y))
-
-	return Grid_Pos{pos_x, pos_y}
+// requires raw window-space
+// i.e mouse position clicked in window get that space in screen
+// returns screen-space pos, scaled to game resolution.
+window_to_screen :: proc(window_pos: rl.Vector2) -> rl.Vector2 {
+	// window_width / game_width will give the scale back
+	// invert it to scale down back to the render size
+	screen_x := window_pos.x / (WINDOW_WIDTH / GAME_WIDTH)
+	screen_y := window_pos.y / (WINDOW_HEIGHT / GAME_HEIGHT)
+	return rl.Vector2{screen_x, screen_y}
 }
 
+// requires screen-space pos i.e mouse pos, scaled from window -> render size
+// returns world-space position (accounts for camera and its zoom)
+// remember uesd with raw input coordinates, not something already in world space (like player.pos).
+screen_to_world :: proc(screen_pos: rl.Vector2, camera: rl.Camera2D) -> rl.Vector2 {
+	return rl.GetScreenToWorld2D(screen_pos, camera)
+}
+
+// @TODO: Do I need this?? Maybe for debug view??
+world_to_screen :: proc(world_pos: rl.Vector2, camera: rl.Camera2D) -> rl.Vector2 {
+	return rl.GetWorldToScreen2D(world_pos, camera)
+}
+
+// requires world-space position i.e player.pos, or output of screen_to_world
+// returns grid col/row not considering camera
+world_to_grid :: proc(world_pos: rl.Vector2) -> Grid_Pos {
+	col := int(math.floor(world_pos.x / TILE_SIZE))
+	row := int(math.floor(world_pos.y / TILE_SIZE))
+	return Grid_Pos{col, row}
+}
+
+// returns world-space position grid pos top-left corner opposite of world_to_grid.
 grid_to_world :: proc(col: int, row: int) -> rl.Vector2 {
 	world_x := f32(col * TILE_SIZE)
 	world_y := f32(row * TILE_SIZE)
-
 	return rl.Vector2{world_x, world_y}
 }
 
@@ -77,9 +98,16 @@ draw_map :: proc(current_map: Game_Map) {
 		row := index / current_map.width
 		column := index % current_map.width
 
-		color := rl.LIGHTGRAY
-		if value == 1 do color = rl.DARKGRAY
-		if value == 2 do color = rl.GREEN
+		tile := Tile_Type(value)
+		color: rl.Color
+		switch tile {
+		case .FLOOR:
+			color = rl.LIGHTGRAY
+		case .WALL:
+			color = rl.DARKGRAY
+		case .PICKUP:
+			color = rl.GREEN
+		}
 
 		rect := grid_to_world(column, row)
 		rl.DrawRectangle(i32(rect.x), i32(rect.y), TILE_SIZE, TILE_SIZE, color)