feat(graphics): implement window manager and display resize handler

crates/molotov-core/src/graphics/mod.rs

@@ -1,3 +1,4 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 pub mod surface;
 pub mod types;
+pub mod window;

crates/molotov-core/src/graphics/window.rs

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use super::surface::GraphicsSurface;
+use super::types::WindowFormat;
+
+#[derive(Debug, Clone)]
+pub struct WindowConfig {
+    pub title: String,
+    pub width: i32,
+    pub height: i32,
+    pub fullscreen: bool,
+    pub vulkan: bool,
+}
+
+impl Default for WindowConfig {
+    fn default() -> Self {
+        Self {
+            title: "Molotov - Roblox".to_string(),
+            width: 1280,
+            height: 720,
+            fullscreen: false,
+            vulkan: true,
+        }
+    }
+}
+
+pub struct WindowManager {
+    config: WindowConfig,
+    pub surface: GraphicsSurface,
+}
+
+impl WindowManager {
+    pub fn new(config: WindowConfig) -> Self {
+        let surface = GraphicsSurface::new(config.width, config.height, WindowFormat::Rgba8888);
+        Self { config, surface }
+    }
+
+    pub fn width(&self) -> i32 {
+        self.surface.width()
+    }
+
+    pub fn height(&self) -> i32 {
+        self.surface.height()
+    }
+
+    pub fn handle_resize(&mut self, width: i32, height: i32) {
+        if width > 0 && height > 0 {
+            self.config.width = width;
+            self.config.height = height;
+            self.surface.set_geometry(width, height, self.surface.format());
+            tracing::info!("WindowManager: surface resized to {}x{}", width, height);
+        }
+    }
+}

crates/molotov-core/tests/window_manager_test.rs

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use molotov_core::graphics::window::{WindowConfig, WindowManager};
+
+#[test]
+fn test_window_manager_configuration_and_resize() {
+    let config = WindowConfig {
+        title: "Roblox".to_string(),
+        width: 1280,
+        height: 720,
+        fullscreen: false,
+        vulkan: true,
+    };
+
+    let mut manager = WindowManager::new(config);
+    assert_eq!(manager.width(), 1280);
+    assert_eq!(manager.height(), 720);
+
+    // Simulate display resize
+    manager.handle_resize(1920, 1080);
+    assert_eq!(manager.width(), 1920);
+    assert_eq!(manager.height(), 1080);
+    assert_eq!(manager.surface.width(), 1920);
+}