text: // Copyright 2014 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "device/gamepad/gamepad_standard_mappings.h"
  
  namespace device {
  
  GamepadButton AxisToButton(float input) {
    float value = (input + 1.f) / 2.f;
    bool pressed = value > kDefaultButtonPressedThreshold;
    bool touched = value > 0.0f;
    return GamepadButton(pressed, touched, value);
  }
  
  GamepadButton AxisNegativeAsButton(float input) {
    float value = (input < -0.5f) ? 1.f : 0.f;
    bool pressed = value > kDefaultButtonPressedThreshold;
    bool touched = value > 0.0f;
    return GamepadButton(pressed, touched, value);
  }
  
  GamepadButton AxisPositiveAsButton(float input) {
    float value = (input > 0.5f) ? 1.f : 0.f;
    bool pressed = value > kDefaultButtonPressedThreshold;
    bool touched = value > 0.0f;
    return GamepadButton(pressed, touched, value);
  }
  
  GamepadButton ButtonFromButtonAndAxis(GamepadButton button, float axis) {
    float value = (axis + 1.f) / 2.f;
    return GamepadButton(button.pressed, button.touched, value);
  }
  
  GamepadButton NullButton() {
    return GamepadButton(false, false, 0.0);
  }
  
  void DpadFromAxis(Gamepad* mapped, float dir) {
    bool up = false;
    bool right = false;
    bool down = false;
    bool left = false;
  
    // Dpad is mapped as a direction on one axis, where -1 is up and it
    // increases clockwise to 1, which is up + left. It's set to a large (> 1.f)
    // number when nothing is depressed, except on start up, sometimes it's 0.0
    // for no data, rather than the large number.
    if (dir != 0.0f) {
      up = (dir >= -1.f && dir < -0.7f) || (dir >= .95f && dir <= 1.f);
      right = dir >= -.75f && dir < -.1f;
      down = dir >= -.2f && dir < .45f;
      left = dir >= .4f && dir <= 1.f;
    }
  
    mapped->buttons[BUTTON_INDEX_DPAD_UP].pressed = up;
    mapped->buttons[BUTTON_INDEX_DPAD_UP].touched = up;
    mapped->buttons[BUTTON_INDEX_DPAD_UP].value = up ? 1.f : 0.f;
    mapped->buttons[BUTTON_INDEX_DPAD_RIGHT].pressed = right;
    mapped->buttons[BUTTON_INDEX_DPAD_RIGHT].touched = right;
    mapped->buttons[BUTTON_INDEX_DPAD_RIGHT].value = right ? 1.f : 0.f;
    mapped->buttons[BUTTON_INDEX_DPAD_DOWN].pressed = down;
    mapped->buttons[BUTTON_INDEX_DPAD_DOWN].touched = down;
    mapped->buttons[BUTTON_INDEX_DPAD_DOWN].value = down ? 1.f : 0.f;
    mapped->buttons[BUTTON_INDEX_DPAD_LEFT].pressed = left;
    mapped->buttons[BUTTON_INDEX_DPAD_LEFT].touched = left;
    mapped->buttons[BUTTON_INDEX_DPAD_LEFT].value = left ? 1.f : 0.f;
  }
  
  }  // namespace device
  