change how systems are stored

src/ecs.odin

@@ -3,27 +3,18 @@ package shoal
 import "core:strings"
 import rl "vendor:raylib"
 
-STARTUP := 0
-UPDATE := 1
-DRAW := 2
+STARTUP :: 0
+UPDATE :: 1
+DRAW :: 2
 
 App :: struct {
-	startup_systems: [dynamic]proc(),
-	update_systems:  [dynamic]proc(),
-	draw_systems:    [dynamic]proc(),
+	systems:  map[int][dynamic]proc(),
 	plugins:  [dynamic]proc(app: ^App),
 	entities: [dynamic]Entity,
 }
 
 add_system :: proc(app: ^App, schedule: int, system: proc()) {
-	switch schedule {
-	case STARTUP:
-		append(&app.startup_systems, system)
-	case UPDATE:
-		append(&app.update_systems, system)
-	case DRAW:
-		append(&app.draw_systems, system)
-	}
+	append(&app.systems[schedule], system)
 }
 
 add_plugin :: proc(app: ^App, plugin: proc(app: ^App)) {
@@ -34,7 +25,7 @@ run :: proc(app: ^App, entity_limit: int = 1000) {
 	for p in app.plugins {
 		p(app)
 	}
-	for i in app.startup_systems {i()}
+	for i in app.systems[STARTUP] {i()}
 
 	_, window := single(&Window)
 	rl.InitWindow(window.width, window.height, strings.clone_to_cstring(window.title))
@@ -43,9 +34,9 @@ run :: proc(app: ^App, entity_limit: int = 1000) {
 	rl.SetTargetFPS(60)
 	for !rl.WindowShouldClose() {
 		rl.ClearBackground(window.background)
-		for i in app.update_systems {i()}
+		for i in app.systems[UPDATE] {i()}
 		rl.BeginDrawing()
-		for i in app.draw_systems {i()}
+		for i in app.systems[DRAW] {i()}
 		rl.EndDrawing()
 	}
 }