create basic tilemap

constants.odin

@@ -4,3 +4,7 @@ WINDOW_WIDTH :: 1280
 WINDOW_HEIGHT :: 720
 WINDOW_TITLE :: "Game 1"
 
+TILE_SIZE :: 32
+MAP_WIDTH :: 40
+MAP_HEIGHT :: 25
+

game.odin

@@ -5,10 +5,16 @@ import rl "vendor:raylib"
 Game :: struct {
 	running: bool,
 	time:    f32, // total time elapsed
+	tilemap: Tilemap,
 }
 
 game_init :: proc() -> Game {
-	return Game{running = true, time = 0}
+	g := Game {
+		running = true,
+		time    = 0,
+	}
+	g.tilemap = tilemap_init()
+	return g
 }
 
 game_update :: proc(g: ^Game, dt: f32) {
@@ -20,8 +26,13 @@ game_update :: proc(g: ^Game, dt: f32) {
 }
 
 game_draw :: proc(g: ^Game) {
+	tilemap_draw(&g.tilemap)
 	fps := rl.GetFPS()
 	rl.DrawText(rl.TextFormat("FPS: %i", fps), 10, 36, 20, rl.GREEN)
 	rl.DrawText(rl.TextFormat("Time: %.1fs", g.time), 10, 62, 20, rl.GRAY)
 }
 
+game_shutdown :: proc(g: ^Game) {
+	tilemap_destroy(&g.tilemap)
+}
+

main.odin

@@ -9,6 +9,7 @@ main :: proc() {
 	rl.SetTargetFPS(60)
 
 	game := game_init()
+	defer game_shutdown(&game)
 
 	for !rl.WindowShouldClose() {
 		rl.BeginDrawing()

tilemap.odin

@@ -0,0 +1,57 @@
+package main
+
+import rl "vendor:raylib"
+
+Tilemap :: struct {
+	width:  int,
+	height: int,
+	tiles:  []u8,
+}
+
+tilemap_init :: proc() -> Tilemap {
+	return Tilemap {
+		width = MAP_WIDTH,
+		height = MAP_HEIGHT,
+		tiles = make([]u8, MAP_WIDTH * MAP_HEIGHT),
+	}
+}
+
+tilemap_destroy :: proc(tilemap: ^Tilemap) {
+	delete(tilemap.tiles)
+}
+
+tile_in_bounds :: proc(tilemap: ^Tilemap, x: int, y: int) -> bool {
+	// learning from another game, this will become handy
+	return x >= 0 && x < tilemap.width && y >= 0 && y < tilemap.height
+}
+
+tile_index :: proc(tilemap: ^Tilemap, x, y: int) -> int {
+	return y * tilemap.width + x
+}
+
+tile_color :: proc(type_id: u8) -> rl.Color {
+	// going to make this a table at some point but for now, we do this
+	switch type_id {
+	case 0:
+		return {72, 112, 68, 255}
+	case:
+		return rl.MAGENTA
+	}
+}
+
+tilemap_draw :: proc(tilemap: ^Tilemap) {
+	for y in 0 ..< tilemap.height {
+		for x in 0 ..< tilemap.width {
+			index := tile_index(tilemap, x, y)
+			type_id := tilemap.tiles[index]
+			color := tile_color(type_id)
+
+			px := i32(x * TILE_SIZE)
+			py := i32(y * TILE_SIZE)
+
+			rl.DrawRectangle(px, py, TILE_SIZE, TILE_SIZE, color)
+			rl.DrawRectangleLines(px, py, TILE_SIZE, TILE_SIZE, {40, 50, 38, 255})
+		}
+	}
+}
+