Add gamepad data fetcher for Linux

content/browser/gamepad/gamepad_standard_mappings_linux.cc

+// Copyright (c) 2012 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 "content/browser/gamepad/gamepad_standard_mappings_linux.h"
+
+#include "content/common/gamepad_hardware_buffer.h"
+
+namespace content {
+
+namespace {
+
+// This defines our canonical mapping order for gamepad-like devices. If these
+// items cannot all be satisfied, it is a case-by-case judgement as to whether
+// it is better to leave the device unmapped, or to partially map it. In
+// general, err towards leaving it *unmapped* so that content can handle
+// appropriately.
+
+enum CanonicalButtonIndex {
+  kButtonPrimary,
+  kButtonSecondary,
+  kButtonTertiary,
+  kButtonQuaternary,
+  kButtonLeftShoulder,
+  kButtonRightShoulder,
+  kButtonLeftTrigger,
+  kButtonRightTrigger,
+  kButtonBackSelect,
+  kButtonStart,
+  kButtonLeftThumbstick,
+  kButtonRightThumbstick,
+  kButtonDpadUp,
+  kButtonDpadDown,
+  kButtonDpadLeft,
+  kButtonDpadRight,
+  kButtonMeta,
+  kNumButtons
+};
+
+enum CanonicalAxisIndex {
+  kAxisLeftStickX,
+  kAxisLeftStickY,
+  kAxisRightStickX,
+  kAxisRightStickY,
+  kNumAxes
+};
+
+float AxisToButton(float input) {
+  return (input + 1.f) / 2.f;
+}
+
+float AxisNegativeAsButton(float input) {
+  return (input < -0.5f) ? 1.f : 0.f;
+}
+
+float AxisPositiveAsButton(float input) {
+  return (input > 0.5f) ? 1.f : 0.f;
+}
+
+void MapperXInputStyleGamepad(
+    const WebKit::WebGamepad& input,
+    WebKit::WebGamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[kButtonLeftTrigger] = AxisToButton(input.axes[2]);
+  mapped->buttons[kButtonRightTrigger] = AxisToButton(input.axes[5]);
+  mapped->buttons[kButtonBackSelect] = input.buttons[6];
+  mapped->buttons[kButtonStart] = input.buttons[7];
+  mapped->buttons[kButtonLeftThumbstick] = input.buttons[9];
+  mapped->buttons[kButtonRightThumbstick] = input.buttons[10];
+  mapped->buttons[kButtonDpadUp] = AxisNegativeAsButton(input.axes[7]);
+  mapped->buttons[kButtonDpadDown] = AxisPositiveAsButton(input.axes[7]);
+  mapped->buttons[kButtonDpadLeft] = AxisNegativeAsButton(input.axes[6]);
+  mapped->buttons[kButtonDpadRight] = AxisPositiveAsButton(input.axes[6]);
+  mapped->buttons[kButtonMeta] = input.buttons[8];
+  mapped->axes[kAxisRightStickX] = input.axes[3];
+  mapped->axes[kAxisRightStickY] = input.axes[4];
+  mapped->buttonsLength = kNumButtons;
+  mapped->axesLength = kNumAxes;
+}
+
+void MapperMP8866(
+    const WebKit::WebGamepad& input,
+    WebKit::WebGamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[kButtonPrimary] = input.buttons[2];
+  mapped->buttons[kButtonTertiary] = input.buttons[3];
+  mapped->buttons[kButtonQuaternary] = input.buttons[0];
+  mapped->buttons[kButtonLeftShoulder] = input.buttons[6];
+  mapped->buttons[kButtonRightShoulder] = input.buttons[7];
+  mapped->buttons[kButtonLeftTrigger] = input.buttons[4];
+  mapped->buttons[kButtonRightTrigger] = input.buttons[5];
+  mapped->buttons[kButtonBackSelect] = input.buttons[9];
+  mapped->buttons[kButtonStart] = input.buttons[8];
+  mapped->buttons[kButtonDpadUp] = AxisNegativeAsButton(input.axes[5]);
+  mapped->buttons[kButtonDpadDown] = AxisPositiveAsButton(input.axes[5]);
+  mapped->buttons[kButtonDpadLeft] = AxisNegativeAsButton(input.axes[4]);
+  mapped->buttons[kButtonDpadRight] = AxisPositiveAsButton(input.axes[4]);
+  mapped->buttonsLength = kNumButtons - 1; // no Meta on this device
+  mapped->axesLength = kNumAxes;
+}
+
+void MapperPlaystationSixAxis(
+    const WebKit::WebGamepad& input,
+    WebKit::WebGamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[kButtonPrimary] = input.buttons[14];
+  mapped->buttons[kButtonSecondary] = input.buttons[13];
+  mapped->buttons[kButtonTertiary] = input.buttons[15];
+  mapped->buttons[kButtonQuaternary] = input.buttons[12];
+  mapped->buttons[kButtonLeftShoulder] = input.buttons[10];
+  mapped->buttons[kButtonRightShoulder] = input.buttons[11];
+  mapped->buttons[kButtonLeftTrigger] = AxisToButton(input.axes[12]);
+  mapped->buttons[kButtonRightTrigger] = AxisToButton(input.axes[13]);
+  mapped->buttons[kButtonBackSelect] = input.buttons[0];
+  mapped->buttons[kButtonStart] = input.buttons[3];
+  mapped->buttons[kButtonLeftThumbstick] = input.buttons[1];
+  mapped->buttons[kButtonRightThumbstick] = input.buttons[2];
+  mapped->buttons[kButtonDpadUp] = AxisToButton(input.axes[8]);
+  mapped->buttons[kButtonDpadDown] = AxisToButton(input.axes[10]);
+  mapped->buttons[kButtonDpadLeft] = input.buttons[7];
+  mapped->buttons[kButtonDpadRight] = AxisToButton(input.axes[9]);
+  mapped->buttons[kButtonMeta] = input.buttons[16];
+
+  mapped->buttonsLength = kNumButtons;
+  mapped->axesLength = kNumAxes;
+}
+
+struct MappingData {
+  const char* const vendor_id;
+  const char* const product_id;
+  GamepadStandardMappingFunction function;
+} AvailableMappings[] = {
+  // http://www.linux-usb.org/usb.ids
+  { "045e", "028e", MapperXInputStyleGamepad }, // Xbox 360 Controller
+  { "045e", "028f", MapperXInputStyleGamepad }, // Xbox 360 Wireless Controller
+  { "046d", "c21d", MapperXInputStyleGamepad }, // Logitech F310
+  { "046d", "c21e", MapperXInputStyleGamepad }, // Logitech F510
+  { "046d", "c21f", MapperXInputStyleGamepad }, // Logitech F710
+  { "054c", "0268", MapperPlaystationSixAxis }, // Playstation SIXAXIS
+  { "0925", "8866", MapperMP8866 }, // WiseGroup MP-8866
+};
+
+}  // namespace
+
+GamepadStandardMappingFunction GetGamepadStandardMappingFunction(
+    const base::StringPiece& vendor_id,
+    const base::StringPiece& product_id) {
+  for (size_t i = 0; i < arraysize(AvailableMappings); ++i) {
+    MappingData& item = AvailableMappings[i];
+    if (vendor_id == item.vendor_id && product_id == item.product_id)
+      return item.function;
+  }
+  return NULL;
+}
+
+}  // namespace content