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#include "dinput.hpp"
#include <QDebug>
std::atomic<int> dinput_handle::refcnt;
std::atomic_flag dinput_handle::init_lock = ATOMIC_FLAG_INIT;
LPDIRECTINPUT8& dinput_handle::init_di()
{
CoInitialize(nullptr);
static LPDIRECTINPUT8 di_ = nullptr;
if (di_ == nullptr)
{
if (!SUCCEEDED(DirectInput8Create(GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (void**)&di_, NULL)))
{
di_ = nullptr;
}
}
return di_;
}
dinput_handle::di_t dinput_handle::make_di()
{
while (init_lock.test_and_set()) { /* busy loop */ }
LPDIRECTINPUT8& ret = init_di();
init_lock.clear();
return di_t(ret);
}
void dinput_handle::di_t::free_di()
{
if (handle && *handle)
{
(*handle)->Release();
*handle = nullptr;
}
handle = nullptr;
}
void dinput_handle::di_t::ref_di()
{
//const int refcnt_ = refcnt.fetch_add(1) + 1;
(void) refcnt.fetch_add(1);
}
dinput_handle::di_t& dinput_handle::di_t::operator=(const di_t& new_di)
{
if (handle)
unref_di();
handle = new_di.handle;
if (handle)
ref_di();
return *this;
}
void dinput_handle::di_t::unref_di()
{
const int refcnt_ = refcnt.fetch_sub(1) - 1;
if (refcnt_ == 0)
{
while (init_lock.test_and_set()) { /* busy loop */ }
qDebug() << "exit: di handle";
free_di();
init_lock.clear();
}
}
dinput_handle::di_t::di_t(LPDIRECTINPUT8& handle) : handle(&handle)
{
ref_di();
}
dinput_handle::di_t::di_t() : handle(nullptr) {}
dinput_handle::di_t::~di_t()
{
if (handle)
unref_di();
}
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