support full screen gameplay

game/display.odin

@@ -0,0 +1,62 @@
+package game
+
+import rl "vendor:raylib"
+
+game_target: rl.RenderTexture2D
+
+init_display :: proc() {
+	rl.InitWindow(DEFAULT_WINDOW_W, DEFAULT_WINDOW_H, "Tower Defense")
+	rl.SetWindowState({.WINDOW_RESIZABLE})
+	rl.SetTargetFPS(60)
+	game_target = rl.LoadRenderTexture(i32(SCREEN_W), i32(SCREEN_H))
+}
+
+shutdown_display :: proc() {
+	rl.UnloadRenderTexture(game_target)
+}
+
+update_display :: proc() {
+	if rl.IsKeyPressed(.F11) {
+		rl.ToggleFullscreen()
+	}
+}
+
+game_viewport_dest :: proc() -> rl.Rectangle {
+	sw := f32(rl.GetRenderWidth())
+	sh := f32(rl.GetRenderHeight())
+	scale := min(sw / f32(SCREEN_W), sh / f32(SCREEN_H))
+	dw := f32(SCREEN_W) * scale
+	dh := f32(SCREEN_H) * scale
+	return {x = (sw - dw) * 0.5, y = (sh - dh) * 0.5, width = dw, height = dh}
+}
+
+game_mouse :: proc() -> rl.Vector2 {
+	m := rl.GetMousePosition()
+	dest := game_viewport_dest()
+	if dest.width <= 0 || dest.height <= 0 {
+		return m
+	}
+	return {
+		(m.x - dest.x) / dest.width * f32(SCREEN_W),
+		(m.y - dest.y) / dest.height * f32(SCREEN_H),
+	}
+}
+
+begin_game_draw :: proc() {
+	rl.BeginTextureMode(game_target)
+	rl.ClearBackground(rl.Color{34, 139, 34, 255})
+}
+
+end_game_draw :: proc() {
+	rl.EndTextureMode()
+
+	rl.BeginDrawing()
+	rl.ClearBackground(rl.BLACK)
+
+	dest := game_viewport_dest()
+	source := rl.Rectangle{0, 0, f32(SCREEN_W), -f32(SCREEN_H)}
+	rl.DrawTexturePro(game_target.texture, source, dest, {}, 0, rl.WHITE)
+
+	rl.EndDrawing()
+}
+