app.control docs (#124)

* app.control docs

* move to input.md file

Author: saori-eth

docs/scripting/app/App.md

@@ -63,11 +63,11 @@ NOTE: Blender GLTF exporter renames objects in some cases, eg by removing spaces
 
 Creates and returns a node of the specified name.
 
-#### `.control(options)`: Control
+### `.control(options)`
+
+Gets a controller for handling user input. See [Input](/docs/scripting/app/Input.md) for more info.
 
-TODO: provides control to a client to respond to inputs and move the camera etc
 
 #### `.configure(fields)`
 
 Configures custom UI for your app. See [Props](/docs/scripting/app/Props.md) for more info.
-

docs/scripting/app/Input.md

@@ -0,0 +1,78 @@
+# Input
+
+## `app.control(options)`: Control
+
+The `app.control()` method gives you access to user inputs like keyboard and mouse. It's the primary way to create interactive experiences. You can have multiple active controls, and they are prioritized.
+
+```javascript
+// Get a control object
+const controls = app.control({ priority: 1 })
+
+// The app will be cleaned up automatically, but if you need to manually release control:
+controls.release()
+```
+
+**Options**
+
+*   `priority` (Number): A number that determines the order of input processing. Higher numbers have higher priority. Defaults to `0`. Player controls usually have a low priority, so scripts can override them.
+*   `onButtonPress` (Function): A callback for any button press. `(prop, text) => {}`. `prop` is the button property name (e.g. `keyW`), `text` is the character for the key. Return `true` to consume the event.
+
+
+### Button Events
+
+You can listen to press and release events for keyboard keys and mouse buttons.
+
+```javascript
+// Listen for 'W' key press and release
+controls.keyW.onPress = () => { console.log('W pressed') }
+controls.keyW.onRelease = () => { console.log('W released') }
+
+// Listen for left mouse button
+controls.mouseLeft.onPress = () => { console.log('Left mouse button pressed') }
+```
+
+Each button object has the following properties:
+*   `onPress` (Function): Callback for when the button is first pressed down.
+*   `onRelease` (Function): Callback for when the button is released.
+*   `down` (Boolean): `true` if the button is currently held down.
+*   `pressed` (Boolean): `true` for the single frame when the button is first pressed.
+*   `released` (Boolean): `true` for the single frame when the button is released.
+*   `capture` (Boolean): If set to `true`, it will consume the event and prevent lower-priority controls from receiving it.
+
+Here is a list of available button properties:
+
+`keyA` to `keyZ`, `digit0` to `digit9`, `minus`, `equal`, `bracketLeft`, `bracketRight`, `backslash`, `semicolon`, `quote`, `backquote`, `comma`, `period`, `slash`, `arrowUp`, `arrowDown`, `arrowLeft`, `arrowRight`, `home`, `end`, `pageUp`, `pageDown`, `tab`, `capsLock`, `shiftLeft`, `shiftRight`, `controlLeft`, `controlRight`, `altLeft`, `altRight`, `enter`, `space`, `backspace`, `delete`, `escape`, `mouseLeft`, `mouseRight`, `metaLeft`.
+
+### Pointer
+
+Access pointer (mouse) information.
+
+```javascript
+// Get pointer delta every frame
+app.on('update', () => {
+  const pointerDelta = controls.pointer.delta
+  if (pointerDelta.x !== 0 || pointerDelta.y !== 0) {
+    console.log('Pointer moved:', pointerDelta.x, pointerDelta.y)
+  }
+})
+```
+
+*   `pointer.coords` (Vector3): Pointer coordinates in normalized screen space (`[0,0]` to `[1,1]`).
+*   `pointer.position` (Vector3): Pointer coordinates in screen pixels.
+*   `pointer.delta` (Vector3): Change in pointer position since the last frame.
+*   `pointer.locked` (Boolean): `true` if the pointer is currently locked.
+*   `pointer.lock()`: Requests to lock the pointer to the screen.
+*   `pointer.unlock()`: Releases the pointer lock.
+
+### Scroll
+
+Get mouse scroll wheel changes.
+
+```javascript
+// The value is the scroll delta for the current frame.
+const scrollDelta = controls.scrollDelta.value
+```
+
+*   `scrollDelta.value` (Number): The scroll delta for the current frame.
+*   `scrollDelta.capture` (Boolean): If `true`, consumes the scroll event.
+