extract math util into sub package

main.odin

@@ -2,6 +2,7 @@ package main
 
 import "core:fmt"
 import "core:image/png"
+import "util"
 import "vendor:sdl3"
 
 WIDTH :: 1600
@@ -24,13 +25,29 @@ main :: proc() {
 	assert(window != nil)
 	defer sdl3.DestroyWindow(window)
 
-	render := sdl3.CreateRenderer(window, "vulkan")
+	render := sdl3.CreateRenderer(window, "opengl")
 
 	assert(render != nil)
 
 	units := make([dynamic]Unit)
-	append(&units, Unit{faction = Faction.Allied, position = Position{x = 500, y = 500}, hp = 100})
-	append(&units, Unit{faction = Faction.Enemy, position = Position{x = 700, y = 700}, hp = 100})
+	append(
+		&units,
+		Unit {
+			faction = Faction.Allied,
+			position = util.Position{x = 500, y = 500},
+			velocity = DEFAULT_VELOCITY,
+			hp = 100,
+		},
+	)
+	append(
+		&units,
+		Unit {
+			faction = Faction.Enemy,
+			position = util.Position{x = 700, y = 700},
+			velocity = DEFAULT_VELOCITY,
+			hp = 100,
+		},
+	)
 	input_state := make(map[sdl3.Scancode]bool)
 
 	time := sdl3.GetTicksNS()
@@ -39,7 +56,12 @@ main :: proc() {
 	game := Game {
 		render = render,
 		units = units,
-		player = Unit{faction = Faction.Player, position = Position{x = 255, y = 255}, hp = 100},
+		player = Unit {
+			faction = Faction.Player,
+			position = util.Position{x = 255, y = 255},
+			velocity = DEFAULT_VELOCITY,
+			hp = 100,
+		},
 		time = time,
 		delta = 0.0,
 		input_state = input_state,

movement.odin

@@ -1,8 +1,10 @@
 package main
 
 import "core:fmt"
+import "util"
 import "vendor:sdl3"
 
+DEFAULT_VELOCITY: util.Velocity : util.Velocity{x = 0, y = 0}
 SPEED: f32 : 200
 
 HandleInput :: proc(game: ^Game, event: sdl3.Event) {
@@ -15,6 +17,7 @@ MovePlayer :: proc(game: ^Game) {
 	y += game.input_state[sdl3.Scancode.S] ? SPEED : 0
 	x: f32 = game.input_state[sdl3.Scancode.A] ? -SPEED : 0
 	x += game.input_state[sdl3.Scancode.D] ? SPEED : 0
+	game.player.velocity = util.Velocity{x, y}
 
 	game.player.position.y += y * game.delta
 	game.player.position.x += x * game.delta

unit.odin

@@ -1,5 +1,6 @@
 package main
 
+import "util"
 import "vendor:sdl3"
 
 Faction :: enum {
@@ -10,7 +11,8 @@ Faction :: enum {
 
 Unit :: struct {
 	faction:  Faction,
-	position: Position,
+	position: util.Position,
+	velocity: util.Velocity,
 	hp:       u32,
 }
 
@@ -31,6 +33,6 @@ RenderUnit :: proc(unit: Unit, game: ^Game) {
 
 Projectile :: struct {
 	faction:   Faction,
-	position:  Position,
-	direction: Direction,
+	position:  util.Position,
+	direction: util.Velocity,
 }

util/math.odin

@@ -1,9 +1,9 @@
-package main
+package util
 
 Position :: struct {
 	x, y: f32,
 }
 
-Direction :: struct {
+Velocity :: struct {
 	x, y: f32,
 }