Add Mac gamepad input remapper

content/browser/gamepad/gamepad_standard_mappings_mac.mm

Index: content/browser/gamepad/gamepad_standard_mappings_mac.mm
diff --git a/content/browser/gamepad/gamepad_standard_mappings_mac.mm b/content/browser/gamepad/gamepad_standard_mappings_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..90eec4347aab18bae8854a09c3da5be182b98640
--- /dev/null
+++ b/content/browser/gamepad/gamepad_standard_mappings_mac.mm
@@ -0,0 +1,122 @@
+// 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.h"
+
+#include "content/common/gamepad_hardware_buffer.h"
+
+namespace content {
+
+namespace {
+
+float AxisToButton(float input) {
+  return (input + 1.f) / 2.f;
+}
+
+void MapperXbox360Gamepad(
+    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[9];
+  mapped->buttons[kButtonStart] = input.buttons[8];
+  mapped->buttons[kButtonLeftThumbstick] = input.buttons[6];
+  mapped->buttons[kButtonRightThumbstick] = input.buttons[7];
+  mapped->buttons[kButtonDpadUp] = input.buttons[11];
+  mapped->buttons[kButtonDpadDown] = input.buttons[12];
+  mapped->buttons[kButtonDpadLeft] = input.buttons[13];
+  mapped->buttons[kButtonDpadRight] = input.buttons[14];
+  mapped->buttons[kButtonMeta] = input.buttons[10];
+  mapped->axes[kAxisRightStickX] = input.axes[3];
+  mapped->axes[kAxisRightStickY] = input.axes[4];
+  mapped->buttonsLength = kNumButtons;
+  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] = input.buttons[8];
+  mapped->buttons[kButtonRightTrigger] = input.buttons[9];
+  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] = input.buttons[4];
+  mapped->buttons[kButtonDpadDown] = input.buttons[6];
+  mapped->buttons[kButtonDpadLeft] = input.buttons[7];
+  mapped->buttons[kButtonDpadRight] = input.buttons[5];
+  mapped->buttons[kButtonMeta] = input.buttons[16];
+  mapped->axes[kAxisRightStickY] = input.axes[5];
+
+  mapped->buttonsLength = kNumButtons;
+  mapped->axesLength = kNumAxes;
+}
+
+void MapperMacallyIshock(
+    const WebKit::WebGamepad& input,
+    WebKit::WebGamepad* mapped) {
+  *mapped = input;
+  mapped->buttons[kButtonPrimary] = input.buttons[1];
+  mapped->buttons[kButtonSecondary] = input.buttons[2];
+  mapped->buttons[kButtonTertiary] = input.buttons[0];
+  mapped->axes[kAxisRightStickY] = input.axes[5];
+
+  // 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.
+  float dir = input.axes[9];
+  if (dir == 0.0f) {
+    mapped->buttons[kButtonDpadUp] = 0.f;
+    mapped->buttons[kButtonDpadDown] = 0.f;
+    mapped->buttons[kButtonDpadLeft] = 0.f;
+    mapped->buttons[kButtonDpadRight] = 0.f;
+  } else {
+    mapped->buttons[kButtonDpadUp] = (dir >= -1.f && dir < -0.7f) ||
+                                     (dir >= .95f && dir <= 1.f);
+    mapped->buttons[kButtonDpadRight] = dir >= -.75f && dir < -.1f;
+    mapped->buttons[kButtonDpadDown] = dir >= -.2f && dir < .45f;
+    mapped->buttons[kButtonDpadLeft] = dir >= .4f && dir <= 1.f;
+  }
+
+  mapped->buttonsLength = kNumButtons - 1; /* no meta */
+  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", MapperXbox360Gamepad },     // Xbox 360 Controller
+  { "045e", "028f", MapperXbox360Gamepad },     // Xbox 360 Wireless Controller
+  { "054c", "0268", MapperPlaystationSixAxis }, // Playstation SIXAXIS
+  { "2222", "0060", MapperMacallyIshock },      // Macally iShockX, analog mode
+};
+
+}  // 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