Question

我创建了一个类来正确初始化和清除Xlib和glx。

OpenGLContext::OpenGLContext()
    :m_display(nullptr)
    ,m_context(nullptr)
    ,m_vi(nullptr)
{
    memset(&m_cmap, 0, sizeof(Colormap));
    memset(&m_swa, 0, sizeof(XSetWindowAttributes));
    memset(&m_win, 0, sizeof(Window));
    m_display = XOpenDisplay(NULL);
    assert(m_display);

    static int dblBuf[] =  {GLX_RGBA, GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1, GLX_BLUE_SIZE, 1, GLX_DEPTH_SIZE, 12, GLX_DOUBLEBUFFER, None};
    m_vi = glXChooseVisual(m_display, DefaultScreen(m_display), dblBuf);
    m_context = glXCreateContext(m_display, m_vi, None, True);
    m_cmap = XCreateColormap(m_display, RootWindow(m_display, m_vi->screen), m_vi->visual, AllocNone);
    m_swa.colormap = m_cmap;
    m_win = XCreateWindow(
                m_display,
                RootWindow(  m_display, m_vi->screen  ),
                0, 0, /* width */ 640, /* height */ 480, 0, m_vi->depth, InputOutput, m_vi->visual,
                CWBorderPixel | CWColormap | CWEventMask, &m_swa
            );

    char* dummy[] = { "", 0 };
    XSetStandardProperties(m_display, m_win, "glxsimple", "glxsimple", None, dummy, 0, NULL);
    glXMakeCurrent(m_display, m_win, m_context);
    XMapWindow(GetDisplay(), GetWindow());
}

OpenGLContext::~OpenGLContext()
{
    XUnmapWindow(m_display, m_win);
    glXMakeCurrent(m_display, None, NULL);
    XFreeColormap(m_display, m_cmap);
    XDestroyWindow(m_display, m_win);
    glXDestroyContext(m_display, m_context);
    XFree(m_vi);
    XCloseDisplay(m_display);
}

不幸的是，valgrind报告内存泄漏。

==28742== 12,796 (584 direct, 12,212 indirect) bytes in 1 blocks are definitely lost in loss record 631 of 637
==28742==    at 0x4C29F5D: malloc (vg_replace_malloc.c:263)
==28742==    by 0xBCD7E7C: driConcatConfigs (in /usr/lib64/mesa/swrastg_dri.so)
==28742==    by 0xBCDBDFF: dri_init_screen_helper (in /usr/lib64/mesa/swrastg_dri.so)
==28742==    by 0xBCDAF0D: drisw_init_screen (in /usr/lib64/mesa/swrastg_dri.so)
==28742==    by 0xBCD8583: driCreateNewScreen (in /usr/lib64/mesa/swrastg_dri.so)
==28742==    by 0x5295604: driswCreateScreen (in /usr/lib64/opengl/xorg-x11/lib/libGL.so.1.2)
==28742==    by 0x527412B: __glXInitialize (in /usr/lib64/opengl/xorg-x11/lib/libGL.so.1.2)
==28742==    by 0x5270154: glXGetFBConfigs (in /usr/lib64/opengl/xorg-x11/lib/libGL.so.1.2)
==28742==    by 0x5270B57: glXChooseFBConfig (in /usr/lib64/opengl/xorg-x11/lib/libGL.so.1.2)
==28742==    by 0x4E9A7CE: ??? (in /usr/lib64/librrfaker.so)
==28742==    by 0x4E5B676: glXChooseVisual (in /usr/lib64/librrfaker.so)
==28742==    by 0x46D23B: Zion::Core::OpenGLContext::OpenGLContext() (OpenGLContext.cpp:23)

请注意，我正在使用VirtualGL（解释librrfaker.so）。有什么我做错了吗？或者我应该假设这是VirtualGL的一个错误？

Answer 1

您不应该自动认为这是一个错误。在处理优化库时，valgrind有时会返回误报结果。确定你需要确保你运行的是未经优化的库版本。

修改

This extract from a valgrind manual表明这只是检查未初始化变量时的问题。我记得以前被误报击中了，但是当我现在想到它时，确实存在未经初始化的价值。

使用glXCreateContext进行内存泄漏

1 个答案: