//
// Copyright (c) 2013-2017 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// SystemInfo_x11.cpp: implementation of the X11-specific parts of SystemInfo.h

#include "gpu_info_util/SystemInfo_internal.h"

#include <X11/Xlib.h>

#include "common/debug.h"
#include "third_party/libXNVCtrl/NVCtrl.h"
#include "third_party/libXNVCtrl/NVCtrlLib.h"

#if !defined(GPU_INFO_USE_X11)
#error SystemInfo_x11.cpp compiled without GPU_INFO_USE_X11
#endif

namespace angle
{

bool GetNvidiaDriverVersionWithXNVCtrl(std::string *version)
{
    *version = "";

    int eventBase = 0;
    int errorBase = 0;

    Display *display = XOpenDisplay(nullptr);

    if (XNVCTRLQueryExtension(display, &eventBase, &errorBase))
    {
        int screenCount = ScreenCount(display);
        for (int screen = 0; screen < screenCount; ++screen)
        {
            char *buffer = nullptr;
            if (XNVCTRLIsNvScreen(display, screen) &&
                XNVCTRLQueryStringAttribute(display, screen, 0,
                                            NV_CTRL_STRING_NVIDIA_DRIVER_VERSION, &buffer))
            {
                ASSERT(buffer != nullptr);
                *version = buffer;
                XFree(buffer);
                return true;
            }
        }
    }

    return false;
}
}