IGameInputDevice::GetTouchSurfaceInfo

HRESULT GetTouchSurfaceInfo(
    uint32_t surfaceIndex,
    GameInputTouchSurfaceInfo* info
);

void ProcessTouch(IGameInputDevice* device, IGameInputReading* reading) noexcept
{
    const uint32_t surfaceCount = device->GetTouchSurfaceCount();
    for (uint32_t surfaceIndex = 0; surfaceIndex < surfaceCount; ++surfaceIndex)
    {
        GameInputTouchSurfaceInfo info = {};
        if (FAILED(device->GetTouchSurfaceInfo(surfaceIndex, &info)) ||
            info.padWidth == 0 || info.padHeight == 0)
        {
            continue;
        }

        GameInputTouchContact contact = {};
        if (reading->GetTouchSurfaceState(surfaceIndex, 1, &contact) == 1)
        {
            const float x = static_cast<float>(contact.padX) / info.padWidth;
            const float y = static_cast<float>(contact.padY) / info.padHeight;
            // Use the normalized position (x, y) of the contact.
        }
    }
}