content/browser/gamepad/gamepad_standard_mappings.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/gamepad/gamepad_standard_mappings.h"
   6
   7 namespace content {
   8
   9 blink::WebGamepadButton AxisToButton(float input) {
  10   float value = (input + 1.f) / 2.f;
  11   return blink::WebGamepadButton(
  12     value > kDefaultButtonPressedThreshold, value);
  13 }
  14
  15 blink::WebGamepadButton AxisNegativeAsButton(float input) {
  16   float value = (input < -0.5f) ? 1.f : 0.f;
  17   return blink::WebGamepadButton(
  18     value > kDefaultButtonPressedThreshold, value);
  19 }
  20
  21 blink::WebGamepadButton AxisPositiveAsButton(float input) {
  22   float value = (input > 0.5f) ? 1.f : 0.f;
  23   return blink::WebGamepadButton(
  24     value > kDefaultButtonPressedThreshold, value);
  25 }
  26
  27 blink::WebGamepadButton ButtonFromButtonAndAxis(
  28     blink::WebGamepadButton button, float axis) {
  29   float value = (axis + 1.f) / 2.f;
  30   return blink::WebGamepadButton(button.pressed, value);
  31 }
  32
  33 blink::WebGamepadButton NullButton() {
  34   return blink::WebGamepadButton(false, 0.0);
  35 }
  36
  37 void DpadFromAxis(blink::WebGamepad* mapped, float dir) {
  38   bool up = false;
  39   bool right = false;
  40   bool down = false;
  41   bool left = false;
  42
  43   // Dpad is mapped as a direction on one axis, where -1 is up and it
  44   // increases clockwise to 1, which is up + left. It's set to a large (> 1.f)
  45   // number when nothing is depressed, except on start up, sometimes it's 0.0
  46   // for no data, rather than the large number.
  47   if (dir != 0.0f) {
  48     up = (dir >= -1.f && dir < -0.7f) || (dir >= .95f && dir <= 1.f);
  49     right = dir >= -.75f && dir < -.1f;
  50     down = dir >= -.2f && dir < .45f;
  51     left = dir >= .4f && dir <= 1.f;
  52   }
  53
  54   mapped->buttons[BUTTON_INDEX_DPAD_UP].pressed = up;
  55   mapped->buttons[BUTTON_INDEX_DPAD_UP].value = up ? 1.f : 0.f;
  56   mapped->buttons[BUTTON_INDEX_DPAD_RIGHT].pressed = right;
  57   mapped->buttons[BUTTON_INDEX_DPAD_RIGHT].value = right ? 1.f : 0.f;
  58   mapped->buttons[BUTTON_INDEX_DPAD_DOWN].pressed = down;
  59   mapped->buttons[BUTTON_INDEX_DPAD_DOWN].value = down ? 1.f : 0.f;
  60   mapped->buttons[BUTTON_INDEX_DPAD_LEFT].pressed = left;
  61   mapped->buttons[BUTTON_INDEX_DPAD_LEFT].value = left ? 1.f : 0.f;
  62 }
  63
  64 }  // namespace content