IGameInputReading::GetTouchSurfaceState

uint32_t GetTouchSurfaceState(
    uint32_t surfaceIndex,
    uint32_t contactArrayCount,
    GameInputTouchContact* contactArray
);

void ReadTouchContacts(
    _In_ IGameInputDevice* device,
    _In_ IGameInputReading* reading) noexcept
{
    const uint32_t surfaceCount = device->GetTouchSurfaceCount();
    for (uint32_t surfaceIndex = 0; surfaceIndex < surfaceCount; ++surfaceIndex)
    {
        GameInputTouchSurfaceInfo surfaceInfo = {};
        if (FAILED(device->GetTouchSurfaceInfo(surfaceIndex, &surfaceInfo)))
        {
            continue;
        }

        std::vector<GameInputTouchContact> contacts(surfaceInfo.maxContactCount);
        const uint32_t contactCount = reading->GetTouchSurfaceState(
            surfaceIndex,
            static_cast<uint32_t>(contacts.size()),
            contacts.data());

        for (uint32_t i = 0; i < contactCount; ++i)
        {
            const GameInputTouchContact& contact = contacts[i];

            // Normalize the position to the range [0, 1].
            const float x = static_cast<float>(contact.padX) / static_cast<float>(surfaceInfo.padWidth);
            const float y = static_cast<float>(contact.padY) / static_cast<float>(surfaceInfo.padHeight);

            // Application-specific code to handle contact.contactId at (x, y)
        }
    }
}