GenericHIDGamepad.cpp   [plain text]

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "GenericHIDGamepad.h"

#if ENABLE(GAMEPAD) && PLATFORM(MAC)

#include <IOKit/hid/IOHIDUsageTables.h>
#include <wtf/HexNumber.h>

namespace WebCore {

GenericHIDGamepad::GenericHIDGamepad(HIDDevice&& device, unsigned index)
    : HIDGamepad(WTFMove(device), index)
{
    LOG(Gamepad, "Creating GenericHIDGamepad %p", this);

    auto inputElements = hidDevice().uniqueInputElementsInDeviceTreeOrder();

    for (auto& element : inputElements) {
        switch (element.usagePage()) {
        case kHIDPage_GenericDesktop:
            maybeAddGenericDesktopElement(element);
            continue;
        case kHIDPage_Button:
            maybeAddButtonElement(element);
            continue;
        default:
            continue;
        }
    }
}

void GenericHIDGamepad::maybeAddGenericDesktopElement(HIDElement& element)
{
    switch (element.usage()) {
    case kHIDUsage_GD_X:
    case kHIDUsage_GD_Y:
    case kHIDUsage_GD_Z:
    case kHIDUsage_GD_Rx:
    case kHIDUsage_GD_Ry:
    case kHIDUsage_GD_Rz:
        m_axisValues.append(0.0);
        m_elementMap.set(element.cookie(), makeUnique<HIDGamepadAxis>(element, m_axisValues.last()));
        break;
    case kHIDUsage_GD_DPadUp:
    case kHIDUsage_GD_DPadDown:
    case kHIDUsage_GD_DPadRight:
    case kHIDUsage_GD_DPadLeft:
        m_buttonValues.append(0.0);
        m_elementMap.set(element.cookie(), makeUnique<HIDGamepadButton>(element, m_buttonValues.last()));
        break;
    default:
        break;
    }
}

void GenericHIDGamepad::maybeAddButtonElement(HIDElement& element)
{
    // If it's in the button page, we assume it's actually a button.
    m_buttonValues.append(0.0);
    m_elementMap.set(element.cookie(), makeUnique<HIDGamepadButton>(element, m_buttonValues.last()));
}

} // namespace WebCore

#endif // ENABLE(GAMEPAD) && PLATFORM(MAC)