allow camera movement with the keyboard

Sources/Voxelotl/Application.swift

@@ -69,6 +69,7 @@ public class Application {
   }
 
   private func beginHandleEvents() {
+    Keyboard.instance.newFrame()
     GameController.instance.newFrame()
   }
 
@@ -82,10 +83,14 @@ public class Application {
       case SDLK_ESCAPE:
         return .exitSuccess
       default:
-        break
+        Keyboard.instance.keyDownEvent(scan: event.key.scancode, repeat: event.key.repeat != 0)
       }
       return .running
 
+    case SDL_EVENT_KEY_UP:
+      Keyboard.instance.keyUpEvent(scan: event.key.scancode)
+      return .running
+
     case SDL_EVENT_GAMEPAD_ADDED:
       if SDL_IsGamepad(event.gdevice.which) != SDL_FALSE {
         GameController.instance.connectedEvent(id: event.gdevice.which)

Sources/Voxelotl/CMakeLists.txt

@@ -28,6 +28,7 @@ add_executable(Voxelotl MACOSX_BUNDLE
   Color.swift
   Camera.swift
   Renderer.swift
+  Keyboard.swift
   GameController.swift
   FPSCalculator.swift
   GameDelegate.swift

Sources/Voxelotl/Game.swift

@@ -27,11 +27,16 @@ class Game: GameDelegate {
   var chunk = Chunk(position: .zero)
 
   init() {
-    self.player.position = SIMD3(0.5, Float(Chunk.chunkSize) + 0.5, 0.5)
+    self.resetPlayer()
-    self.player.rotation = .init(.pi, 0)
     self.generateWorld()
   }
 
+  private func resetPlayer() {
+    self.player.position = .init(repeating: 0.5) + .init(0, Float(Chunk.chunkSize), 0)
+    self.player.velocity = .zero
+    self.player.rotation = .init(.pi, 0)
+  }
+
   private func generateWorld() {
 #if true
     let newSeed = UInt64(Arc4Random.instance.next()) | UInt64(Arc4Random.instance.next()) << 32
@@ -70,9 +75,7 @@ class Game: GameDelegate {
 
       // Player reset
       if pad.pressed(.back) {
-        self.player.position = .init(repeating: 0.5) + .init(0, Float(Chunk.chunkSize), 0)
+        self.resetPlayer()
-        self.player.velocity = .zero
-        self.player.rotation = .init(.pi, 0)
       }
 
       // Regenerate
@@ -81,6 +84,13 @@ class Game: GameDelegate {
       }
     }
 
+    if Keyboard.pressed(.r) {
+      self.resetPlayer()
+    }
+    if Keyboard.pressed(.g) {
+      self.generateWorld()
+    }
+
     self.player.update(deltaTime: deltaTime, chunk: chunk)
     self.camera.position = player.eyePosition
     self.camera.rotation = player.eyeRotation

Sources/Voxelotl/Keyboard.swift

@@ -0,0 +1,137 @@
+import SDL3
+
+public class Keyboard {
+  public enum Keys {
+    case a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z
+    case right, left, up, down
+    case space
+  }
+
+  public static func down(_ key: Keys) -> Bool {
+     keyState(key) & Self._DOWN == Self._DOWN
+  }
+
+  public static func pressed(_ key: Keys, repeat rep: Bool = false) -> Bool {
+    var state = keyState(key)
+    if rep {
+      state &= ~Self._REPEAT
+    }
+    return state == Self._PRESS
+  }
+
+  public static func released(_ key: Keys) -> Bool {
+    keyState(key) == Self._RELEASE
+  }
+
+  //MARK: - Private
+
+  private static let _instance = Keyboard()
+  public static var instance: Keyboard { _instance }
+
+  @inline(__always) private static func keyState(_ key: Keys) -> UInt8 {
+    self._instance._state[Int(key.sdlScancode.rawValue)]
+  }
+
+  private static let _UP = UInt8(0b000), _DOWN = UInt8(0b010), _IMPULSE = UInt8(0b001)
+  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) {
+    var newState = Self._PRESS
+    if rep {
+      newState |= Self._REPEAT
+    }
+    self._state[Int(scan.rawValue)] = newState
+  }
+
+  internal func keyUpEvent(scan: SDL_Scancode) {
+    self._state[Int(scan.rawValue)] = Self._RELEASE
+  }
+
+  internal func newFrame() {
+    self._state = self._state.map({ $0 & ~(Self._IMPULSE | Self._REPEAT) })
+  }
+}
+
+internal extension Keyboard.Keys {
+  var sdlKeycode: SDL_Keycode {
+    switch self {
+    case .a:     SDLK_A
+    case .b:     SDLK_B
+    case .c:     SDLK_C
+    case .d:     SDLK_D
+    case .e:     SDLK_E
+    case .f:     SDLK_F
+    case .g:     SDLK_G
+    case .h:     SDLK_H
+    case .i:     SDLK_I
+    case .j:     SDLK_J
+    case .k:     SDLK_K
+    case .l:     SDLK_L
+    case .m:     SDLK_M
+    case .n:     SDLK_N
+    case .o:     SDLK_O
+    case .p:     SDLK_P
+    case .q:     SDLK_Q
+    case .r:     SDLK_R
+    case .s:     SDLK_S
+    case .t:     SDLK_T
+    case .u:     SDLK_U
+    case .v:     SDLK_V
+    case .w:     SDLK_W
+    case .x:     SDLK_X
+    case .y:     SDLK_Y
+    case .z:     SDLK_Z
+    case .left:  SDLK_LEFT
+    case .right: SDLK_RIGHT
+    case .up:    SDLK_UP
+    case .down:  SDLK_DOWN
+    case .space: SDLK_SPACE
+    }
+  }
+
+  var sdlScancode: SDL_Scancode {
+    switch self {
+    case .a:     SDL_SCANCODE_A
+    case .b:     SDL_SCANCODE_B
+    case .c:     SDL_SCANCODE_C
+    case .d:     SDL_SCANCODE_D
+    case .e:     SDL_SCANCODE_E
+    case .f:     SDL_SCANCODE_F
+    case .g:     SDL_SCANCODE_G
+    case .h:     SDL_SCANCODE_H
+    case .i:     SDL_SCANCODE_I
+    case .j:     SDL_SCANCODE_J
+    case .k:     SDL_SCANCODE_K
+    case .l:     SDL_SCANCODE_L
+    case .m:     SDL_SCANCODE_M
+    case .n:     SDL_SCANCODE_N
+    case .o:     SDL_SCANCODE_O
+    case .p:     SDL_SCANCODE_P
+    case .q:     SDL_SCANCODE_Q
+    case .r:     SDL_SCANCODE_R
+    case .s:     SDL_SCANCODE_S
+    case .t:     SDL_SCANCODE_T
+    case .u:     SDL_SCANCODE_U
+    case .v:     SDL_SCANCODE_V
+    case .w:     SDL_SCANCODE_W
+    case .x:     SDL_SCANCODE_X
+    case .y:     SDL_SCANCODE_Y
+    case .z:     SDL_SCANCODE_Z
+    case .left:  SDL_SCANCODE_LEFT
+    case .right: SDL_SCANCODE_RIGHT
+    case .up:    SDL_SCANCODE_UP
+    case .down:  SDL_SCANCODE_DOWN
+    case .space: SDL_SCANCODE_SPACE
+    }
+  }
+}
+
+fileprivate extension SDL_Keycode {
+  init(scancode: SDL_Scancode) {
+    self.init(scancode.rawValue | UInt32(SDLK_SCANCODE_MASK))
+  }
+}

Sources/Voxelotl/Player.swift

@@ -14,6 +14,7 @@ struct Player {
   static let airAccelCoeff: Float = 3
   static let gravityCoeff: Float = 20
   static let frictionCoeff: Float = 22
+  static let flySpeedCoeff: Float = 36
   static let jumpVelocity: Float = 7
   static let maxVelocity: Float = 160
 
@@ -34,11 +35,45 @@ struct Player {
     .init(angle: self._rotation.x, axis: .up)
   }
 
+  enum JumpInput { case off, press, held }
+
   mutating func update(deltaTime: Float, chunk: Chunk) {
+    var turning: SIMD2<Float> = .zero
+    var movement: SIMD2<Float> = .zero
+    var flying: Float = .zero
+    var jumpInput: JumpInput = .off
+
+    // 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)
+      flying += pad.rightTrigger.axisDeadzone(0.01, 1) - pad.leftTrigger.axisDeadzone(0.01, 1)
+      if pad.pressed(.east) {
+        jumpInput = .press
+      } else if jumpInput != .press && pad.down(.east) {
+        jumpInput = .held
+      }
+    }
+
+    // Read keyboard input
+    if Keyboard.down(.w) { movement.y -= 1 }
+    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(.down)  { turning.y += 1 }
+    if Keyboard.down(.left)  { turning.x -= 1 }
+    if Keyboard.down(.right) { turning.x += 1 }
+    if Keyboard.down(.q) { flying += 1 }
+    if Keyboard.down(.e) { flying -= 1 }
+    if Keyboard.pressed(.space) {
+      jumpInput = .press
+    } else if jumpInput != .press && Keyboard.down(.space) {
+      jumpInput = .held
+    }
+
     // Turning input
-      let turning = pad.rightStick.radialDeadzone(min: 0.1, max: 1)
+    self._rotation += turning * deltaTime * 3.0
-      _rotation += turning * deltaTime * 3.0
     if self._rotation.x < 0.0 {
       self._rotation.x += .pi * 2
     } else if _rotation.x > .pi * 2 {
@@ -47,10 +82,10 @@ struct Player {
     self._rotation.y = self._rotation.y.clamp(-.pi * 0.5, .pi * 0.5)
 
     // Jumping
-      if pad.pressed(.east) {
+    if jumpInput == .press {
       self._shouldJump = 0.3
     } else if self._shouldJump != .none {
-        if pad.down(.east) {
+      if jumpInput == .held {
         self._shouldJump! -= deltaTime
         if self._shouldJump! <= 0.0 {
           self._shouldJump = .none
@@ -66,15 +101,18 @@ struct Player {
     }
 
     // Movement (slower in air than on ground)
-      let movement = pad.leftStick.cardinalDeadzone(min: 0.1, max: 1)
+    let movementMagnitude = simd_length(movement)
+    if movementMagnitude > 1.0 {
+      movement /= movementMagnitude
+    }
     let rotc = cos(self._rotation.x), rots = sin(self._rotation.x)
     let coeff = self._onGround ? Self.accelerationCoeff : Self.airAccelCoeff
     self._velocity.x += (movement.x * rotc - movement.y * rots) * coeff * deltaTime
     self._velocity.z += (movement.y * rotc + movement.x * rots) * coeff * deltaTime
 
     // Flying and unflying
-      self._velocity.y += (pad.rightTrigger - pad.leftTrigger) * 36 * deltaTime
+    flying = flying.clamp(-1, 1)
-    }
+    self._velocity.y += flying * Self.flySpeedCoeff * deltaTime
 
     // Apply gravity
     self._velocity.y -= Self.gravityCoeff * deltaTime