add mouse support

Sources/Voxelotl/Application.swift

@@ -71,6 +71,7 @@ public class Application {
   private func beginHandleEvents() {
     Keyboard.instance.newFrame()
     GameController.instance.newFrame()
+    Mouse.instance.newFrame(window!)
   }
 
   private func handleEvent(_ event: SDL_Event) -> ApplicationExecutionState {
@@ -108,6 +109,17 @@ public class Application {
         btn: SDL_GamepadButton(Int32(event.gbutton.button)), state: event.gbutton.state)
       return .running
 
+    case SDL_EVENT_MOUSE_BUTTON_DOWN, SDL_EVENT_MOUSE_BUTTON_UP:
+      Mouse.instance.buttonEvent(
+        btn: UInt32(event.button.button),
+        state: event.button.state)
+      return .running
+    case SDL_EVENT_MOUSE_MOTION:
+      Mouse.instance.motionEvent(
+        absolute: SIMD2(event.motion.x, event.motion.y),
+        relative: SIMD2(event.motion.xrel, event.motion.yrel))
+      return .running
+
     case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED:
       let backBufferSize = Size(Int(event.window.data1), Int(event.window.data2))
       self.renderer!.resize(size: backBufferSize)

Sources/Voxelotl/CMakeLists.txt

@@ -26,12 +26,15 @@ add_executable(Voxelotl MACOSX_BUNDLE
   # Resource classes
   NSImageLoader.swift
 
+  # Input wrappers
+  Input/Keyboard.swift
+  Input/GameController.swift
+  Input/Mouse.swift
+
   # Core utility classes
   Color.swift
   Camera.swift
   Renderer.swift
-  Keyboard.swift
-  GameController.swift
   FPSCalculator.swift
   GameDelegate.swift
   Application.swift
@@ -81,3 +84,4 @@ source_group("Resources" FILES Assets.xcassets test.png)
 source_group("Source Files" REGULAR_EXPRESSION "\\.(swift|metal)$")
 source_group("Source Files\\Random" REGULAR_EXPRESSION "Random/")
 source_group("Source Files\\Math" REGULAR_EXPRESSION "Math/")
+source_group("Source Files\\Input" REGULAR_EXPRESSION "Input/")

Sources/Voxelotl/Input/Keyboard.swift

@@ -36,7 +36,7 @@ public class Keyboard {
   private static let _REPEAT = UInt8(0b100)
   private static let _PRESS: UInt8 = _DOWN | _IMPULSE
   private static let _RELEASE: UInt8 = _UP | _IMPULSE
-  
+
   private var _state = [UInt8](repeating: _UP, count: Int(SDL_NUM_SCANCODES.rawValue))
 
   internal func keyDownEvent(scan: SDL_Scancode, repeat rep: Bool) {

Sources/Voxelotl/Input/Mouse.swift

@@ -0,0 +1,81 @@
+import SDL3
+
+public class Mouse {
+  public struct Buttons: OptionSet {
+    public let rawValue: UInt32
+    public init(rawValue: UInt32) { self.rawValue = rawValue }
+
+    static let left    = Self(rawValue: UInt32(SDL_BUTTON_LEFT).buttonMask)
+    static let middle  = Self(rawValue: UInt32(SDL_BUTTON_MIDDLE).buttonMask)
+    static let right   = Self(rawValue: UInt32(SDL_BUTTON_RIGHT).buttonMask)
+    static let button4 = Self(rawValue: UInt32(SDL_BUTTON_X1).buttonMask)
+    static let button5 = Self(rawValue: UInt32(SDL_BUTTON_X2).buttonMask)
+  }
+
+  public static var capture: Bool {
+    get { self._instance.getCapture() }
+    set { self._instance.setCapture(newValue) }
+  }
+
+  public static var position: SIMD2<Float> { self._instance.getAbsolute() }
+  public static var relative: SIMD2<Float> { self._instance.getDelta() }
+
+  public static func down(_ btn: Buttons) -> Bool {
+    btn.isSubset(of: self._instance._btns)
+  }
+  public static func pressed(_ btn: Buttons) -> Bool {
+    btn.isSubset(of: self._instance._btns.intersection(self._instance._btnImpulse))
+  }
+  public static func released(_ btn: Buttons) -> Bool {
+    btn.isSubset(of: self._instance._btnImpulse.subtracting(self._instance._btns))
+  }
+
+  //MARK: - Private
+
+  private static let _instance = Mouse()
+  public static var instance: Mouse { self._instance }
+
+  private var _window: OpaquePointer!
+  private var _captured: Bool = false
+  private var _abs: SIMD2<Float> = .zero, _delta: SIMD2<Float> = .zero
+  private var _btns: Buttons = [], _btnImpulse: Buttons = []
+
+  private func getCapture() -> Bool { self._captured }
+  private func setCapture(_ toggle: Bool) {
+    let sdlBool = toggle ? SDL_TRUE : SDL_FALSE
+    if SDL_SetRelativeMouseMode(sdlBool) >= 0 && SDL_SetWindowMouseGrab(self._window, sdlBool) >= 0 {
+      self._captured = toggle
+    }
+  }
+
+  private func getAbsolute() -> SIMD2<Float> { self._abs }
+  private func getDelta() -> SIMD2<Float> { self._delta }
+
+  internal func buttonEvent(btn: UInt32, state: UInt8) {
+    if state == SDL_PRESSED {
+      self._btns.formUnion(.init(rawValue: btn.buttonMask))
+    } else {
+      self._btns.subtract(.init(rawValue: btn.buttonMask))
+    }
+    self._btnImpulse.formUnion(.init(rawValue: btn.buttonMask))
+  }
+
+  internal func motionEvent(absolute: SIMD2<Float>, relative: SIMD2<Float>) {
+    self._abs = absolute
+    self._delta += relative
+  }
+
+  internal func newFrame(_ window: OpaquePointer) {
+    self._window = window
+
+    let grabbedFlag = SDL_WindowFlags(SDL_WINDOW_MOUSE_GRABBED)
+    self._captured = (SDL_GetWindowFlags(window) & grabbedFlag) == grabbedFlag
+
+    self._delta = .zero
+    self._btnImpulse = []
+  }
+}
+
+fileprivate extension UInt32 {
+  var buttonMask: UInt32 { 1 &<< (self &- 1) }
+}

Sources/Voxelotl/Player.swift

@@ -50,7 +50,7 @@ struct Player {
     // Read controller input (if one is plugged in)
     if let pad = GameController.current?.state {
       turning += pad.rightStick.radialDeadzone(min: 0.1, max: 1)
-      movement += pad.leftStick.cardinalDeadzone(min: 0.1, max: 1)
+      movement = pad.leftStick.cardinalDeadzone(min: 0.1, max: 1)
       flying += (pad.down(.rightBumper) ? 1 : 0) - (pad.down(.leftBumper) ? 1 : 0)
       if pad.pressed(.east) {
         jumpInput = .press
@@ -72,19 +72,22 @@ struct Player {
     if Keyboard.down(.s) { movement.y += 1 }
     if Keyboard.down(.a) { movement.x -= 1 }
     if Keyboard.down(.d) { movement.x += 1 }
-    if Keyboard.down(.up)    { turning.y -= 1 }
+    if Keyboard.down(.q) { flying += 1 }
-    if Keyboard.down(.down)  { turning.y += 1 }
+    if Keyboard.down(.e) { flying -= 1 }
-    if Keyboard.down(.left)  { turning.x -= 1 }
+    if Keyboard.pressed(.tab) { Mouse.capture = !Mouse.capture }
-    if Keyboard.down(.right) { turning.x += 1 }
-    if Keyboard.down(.tab) { flying += 1 }
-    if Keyboard.pressed(.q) { place   = true }
-    if Keyboard.pressed(.e) { destroy = true }
     if Keyboard.pressed(.space) {
       jumpInput = .press
     } else if jumpInput != .press && Keyboard.down(.space) {
       jumpInput = .held
     }
 
+    // Read mouse input
+    if Mouse.pressed(.left)  { destroy = true }
+    if Mouse.pressed(.right) { place   = true }
+    if Mouse.capture {
+      self._rotation += Mouse.relative / 2048 * Float.pi
+    }
+
     // Turning input
     self._rotation += turning * deltaTime * 3.0
     if self._rotation.x < 0.0 {