internal FILETIME
W32_GetLastWriteTime(char *filename)
{
    FILETIME last_write_time = {0};
    WIN32_FIND_DATA find_data;
    HANDLE find_handle = FindFirstFileA(filename, &find_data);
    if(find_handle != INVALID_HANDLE_VALUE)
    {
        FindClose(find_handle);
        last_write_time = find_data.ftLastWriteTime;
    }
    return last_write_time;
}

internal void *
W32_HeapAlloc(u32 size)
{
    return HeapAlloc(GetProcessHeap(), 0, size);
}

internal void
W32_HeapFree(void *data)
{
    HeapFree(GetProcessHeap(), 0, data);
}

internal void *
W32_Reserve(u64 size)
{
    void *memory = VirtualAlloc(0, size, MEM_RESERVE, PAGE_NOACCESS);
    return memory;
}

internal void
W32_Release(void *memory)
{
    VirtualFree(memory, 0, MEM_RELEASE);
}

internal void
W32_Commit(void *memory, u64 size)
{
    VirtualAlloc(memory, size, MEM_COMMIT, PAGE_READWRITE);
}

internal void
W32_Decommit(void *memory, u64 size)
{
    VirtualFree(memory, size, MEM_DECOMMIT);
}

internal void
W32_OutputError(char *title, char *format, ...)
{
    local_persist volatile LONG locked = 0;
    
    while(locked);
    InterlockedExchange(&locked, 1);
    {
        va_list args;
        va_start(args, format);
        u32 required_characters = vsnprintf(0, 0, format, args)+1;
        va_end(args);
        
        local_persist char text[4096] = {0};
        
        if(required_characters > 4096)
        {
            required_characters = 4096;
        }
        
        va_start(args, format);
        vsnprintf(text, required_characters, format, args);
        va_end(args);
        
        text[required_characters-1] = 0;
        
        MessageBoxA(0, text, title, MB_OK);
    }
    InterlockedExchange(&locked, 0);
}

internal void
W32_ToggleFullscreen(HWND hwnd)
{
    local_persist WINDOWPLACEMENT last_window_placement = {
        sizeof(last_window_placement)
    };
    
    DWORD window_style = GetWindowLong(hwnd, GWL_STYLE);
    if(window_style & WS_OVERLAPPEDWINDOW)
    {
        MONITORINFO monitor_info = { sizeof(monitor_info) };
        if(GetWindowPlacement(hwnd, &last_window_placement) &&
           GetMonitorInfo(MonitorFromWindow(hwnd, MONITOR_DEFAULTTOPRIMARY),
                          &monitor_info))
        {
            
            SetWindowLong(hwnd, GWL_STYLE,
                          window_style & ~WS_OVERLAPPEDWINDOW);
            
            SetWindowPos(hwnd, HWND_TOP,
                         monitor_info.rcMonitor.left,
                         monitor_info.rcMonitor.top,
                         monitor_info.rcMonitor.right -
                         monitor_info.rcMonitor.left,
                         monitor_info.rcMonitor.bottom -
                         monitor_info.rcMonitor.top,
                         SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
        }
    }
    else
    {
        SetWindowLong(hwnd, GWL_STYLE,
                      window_style | WS_OVERLAPPEDWINDOW);
        SetWindowPlacement(hwnd, &last_window_placement);
        SetWindowPos(hwnd, 0, 0, 0, 0, 0,
                     SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER |
                     SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
    }
}