diff --git a/src/lib.rs b/src/lib.rs
index ddb0732..c5ab6e3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,6 +16,8 @@ pub struct PlatformConfig {
     pub aspect_ratio:     Option<f32>,
     pub palette:          [[u8; 3]; 256],
     pub vsync:            bool,
+    pub mouse_visible:    bool,
+    pub mouse_capture:    bool,
 }
 
 impl Default for PlatformConfig {
@@ -27,6 +29,8 @@ impl Default for PlatformConfig {
             aspect_ratio:     Some(4.0 / 3.0),
             palette:          palette::RGB332,
             vsync:            true,
+            mouse_visible:    true,
+            mouse_capture:    false,
         }
     }
 }
@@ -99,6 +103,13 @@ pub struct Platform {
     event_queue:      VecDeque<Event>,
     event_scratch:    Vec<glfw::WindowEvent>,
     close_requested:  bool,
+
+    mouse_visible:    bool,
+    mouse_capture:    bool,
+    // Letzte rohe (window-space) Cursorposition, um Deltas zu bilden. None nach
+    // Mode-Wechsel/erstem Frame, damit der GLFW-Recenter keinen Riesensprung erzeugt.
+    last_cursor_pos:  Option<(f64, f64)>,
+    mouse_delta:      (f32, f32),
 }
 
 impl Platform {
@@ -203,7 +214,7 @@ impl Platform {
             ],
         });
 
-        Self {
+        let mut platform = Self {
             bind_group, pipeline, index_tex, palette_tex, params_buf, params,
             surface, config: surface_config, device, queue, instance,
             window, events, glfw,
@@ -213,7 +224,41 @@ impl Platform {
             event_queue:      VecDeque::new(),
             event_scratch:    Vec::new(),
             close_requested:  false,
-        }
+            mouse_visible:    cfg.mouse_visible,
+            mouse_capture:    cfg.mouse_capture,
+            last_cursor_pos:  None,
+            mouse_delta:      (0.0, 0.0),
+        };
+        platform.apply_cursor_mode();
+        platform
+    }
+
+    pub fn set_mouse_visible(&mut self, visible: bool) {
+        self.mouse_visible = visible;
+        self.apply_cursor_mode();
+    }
+
+    pub fn set_mouse_capture(&mut self, capture: bool) {
+        self.mouse_capture = capture;
+        // Recenter nach Mode-Wechsel würde den nächsten Delta springen lassen.
+        self.last_cursor_pos = None;
+        self.apply_cursor_mode();
+    }
+
+    fn apply_cursor_mode(&mut self) {
+        // capture impliziert hidden — GLFW kennt keinen "locked + visible".
+        let mode = match (self.mouse_capture, self.mouse_visible) {
+            (true,  _)     => glfw::CursorMode::Disabled,
+            (false, true)  => glfw::CursorMode::Normal,
+            (false, false) => glfw::CursorMode::Hidden,
+        };
+        self.window.set_cursor_mode(mode);
+    }
+
+    /// Akkumulierte Mausbewegung seit dem letzten Aufruf, in Window-Pixeln.
+    /// Bei `set_mouse_capture(true)` liefert GLFW unbegrenzte Deltas (FPS-Stil).
+    pub fn mouse_delta(&mut self) -> (f32, f32) {
+        std::mem::replace(&mut self.mouse_delta, (0.0, 0.0))
     }
 
     pub fn should_close(&self) -> bool { self.close_requested || self.window.should_close() }
@@ -312,6 +357,12 @@ impl Platform {
             }
             W::Char(c) => self.event_queue.push_back(Event::Char(c)),
             W::CursorPos(x, y) => {
+                if let Some((lx, ly)) = self.last_cursor_pos {
+                    self.mouse_delta.0 += (x - lx) as f32;
+                    self.mouse_delta.1 += (y - ly) as f32;
+                }
+                self.last_cursor_pos = Some((x, y));
+
                 let (cx, cy, cw, ch) = self.content_rect;
                 let (fw, fh) = self.framebuffer_size;
                 let fx = ((x - cx as f64) / cw as f64 * fw as f64) as f32;