content/browser/gamepad/gamepad_standard_mappings.h

   1 // Copyright (c) 2012 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 #ifndef CONTENT_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_
   6 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_
   7
   8 #include "base/strings/string_piece.h"
   9 #include "content/common/gamepad_hardware_buffer.h"
  10
  11 namespace content {
  12
  13 typedef void (*GamepadStandardMappingFunction)(
  14     const blink::WebGamepad& original,
  15     blink::WebGamepad* mapped);
  16
  17 GamepadStandardMappingFunction GetGamepadStandardMappingFunction(
  18     const base::StringPiece& vendor_id,
  19     const base::StringPiece& product_id);
  20
  21 // This defines our canonical mapping order for gamepad-like devices. If these
  22 // items cannot all be satisfied, it is a case-by-case judgement as to whether
  23 // it is better to leave the device unmapped, or to partially map it. In
  24 // general, err towards leaving it *unmapped* so that content can handle
  25 // appropriately.
  26
  27 enum CanonicalButtonIndex {
  28   kButtonPrimary,
  29   kButtonSecondary,
  30   kButtonTertiary,
  31   kButtonQuaternary,
  32   kButtonLeftShoulder,
  33   kButtonRightShoulder,
  34   kButtonLeftTrigger,
  35   kButtonRightTrigger,
  36   kButtonBackSelect,
  37   kButtonStart,
  38   kButtonLeftThumbstick,
  39   kButtonRightThumbstick,
  40   kButtonDpadUp,
  41   kButtonDpadDown,
  42   kButtonDpadLeft,
  43   kButtonDpadRight,
  44   kButtonMeta,
  45   kNumButtons
  46 };
  47
  48 enum CanonicalAxisIndex {
  49   kAxisLeftStickX,
  50   kAxisLeftStickY,
  51   kAxisRightStickX,
  52   kAxisRightStickY,
  53   kNumAxes
  54 };
  55
  56 // Matches XInput's trigger deadzone
  57 const float kDefaultButtonPressedThreshold = 30.f/255.f;
  58
  59 // Common mapping functions
  60 blink::WebGamepadButton AxisToButton(float input);
  61 blink::WebGamepadButton AxisNegativeAsButton(float input);
  62 blink::WebGamepadButton AxisPositiveAsButton(float input);
  63 blink::WebGamepadButton ButtonFromButtonAndAxis(
  64     blink::WebGamepadButton button, float axis);
  65 blink::WebGamepadButton NullButton();
  66 void DpadFromAxis(blink::WebGamepad* mapped, float dir);
  67
  68 }  // namespace content
  69
  70 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_STANDARD_MAPPINGS_H_