尝试获取alraedy创建Surface并接收已连接到另一个API错误的EGLNativeWindowType失败

Question

我正在尝试使用包含原生.so文件的Google Cardboard Android SDK，我认为其中包含GL级代码。

将其与其他3D渲染引擎集成后，我得到以下错误。

> 03-09 21:28:13.322: E/libEGL(29766): EGLNativeWindowType 0x76c99010
> already connected to another API 03-09 21:28:13.322: E/libEGL(29766):
> eglCreateWindowSurface:414 error 3003 (EGL_BAD_ALLOC)

实际上在初始化渲染引擎期间。它在呼唤，

eglCreateWindowSurface(m_display, config, &window, NULL);

尝试创建EGLSurface，我认为它已经由Cardboard Native代码创建，因此抛出了上述错误。

因此我试图使用下面的命令创建EGLSurface，但它也不起作用。

eglGetCurrentSurface(EGL_DRAW)

这里我不知道究竟要通过eglGetCurrentSurface EGL_DRAW或EGL_READ传递什么。我试过阅读OpenGL文档，但它没有多大帮助。

总的来说，我试图获得EGLContext，EGLSurface和EGLDisplay而不是创建它们。

以下是我要修改的原始代码。

EGLint w, h, dummy, format;
    EGLConfig config;
    EGLSurface surface;

    if (!DefaultEGLChooser(m_display, EGL_WINDOW_BIT, config))
    {
        Eegeo_ERROR("unable to find a good display type");
        return false;
    }

    eglGetConfigAttrib(m_display, config, EGL_NATIVE_VISUAL_ID, &format);

    ANativeWindow_setBuffersGeometry(&window, 0, 0, format);

    static const EGLint contextAttribs[] =
    {
        EGL_CONTEXT_CLIENT_VERSION,
        2,
        EGL_NONE
    };

    surface = eglCreateWindowSurface(m_display, config, &window, NULL);

    if(m_context == EGL_NO_CONTEXT)
    {
        m_context = eglCreateContext(m_display, config, NULL, contextAttribs);
    }

    if (eglMakeCurrent(m_display, surface, surface, m_context) == EGL_FALSE)
    {
        Eegeo_ERROR("Unable to eglMakeCurrent");
        return false;
    }

    //Eegeo_TTY("printing extensions\n");
    //char * extensionsString =  (char *) glGetString(GL_EXTENSIONS);
    //Eegeo_TTY("%s\n",extensionsString);

    Eegeo_GL(eglQuerySurface(m_display, surface, EGL_WIDTH, &w));
    Eegeo_GL(eglQuerySurface(m_display, surface, EGL_HEIGHT, &h));

    m_surface = surface;

#ifdef EEGEO_DROID_EMULATOR
    m_sharedSurface = EGL_NO_SURFACE;
    m_resourceBuildSharedContext = EGL_NO_CONTEXT;
#else
    if(m_resourceBuildSharedContext == EGL_NO_CONTEXT)
    {
        m_resourceBuildSharedContext = eglCreateContext(m_display, config, m_context, contextAttribs);
    }

    EGLint pBufferAttribs[] =
    {
        EGL_WIDTH, 1,
        EGL_HEIGHT, 1,
        EGL_TEXTURE_TARGET, EGL_NO_TEXTURE,
        EGL_TEXTURE_FORMAT, EGL_NO_TEXTURE,
        EGL_NONE
    };
    EGLConfig sharedSurfaceConfig;
    if (!DefaultEGLChooser(m_display, EGL_PBUFFER_BIT, sharedSurfaceConfig))
    {
        Eegeo_ERROR("unabled to find a good pbuffer surface type");
    }

    m_sharedSurface = eglCreatePbufferSurface(m_display, sharedSurfaceConfig, pBufferAttribs);
#endif

以下是我的修改版本，它给了我黑屏。

    EGLint w, h, dummy, format;
    EGLConfig config;
    EGLSurface surface;

    if (!DefaultEGLChooser(m_display, EGL_WINDOW_BIT, config))
    {
        Eegeo_ERROR("unable to find a good display type");
        return false;
    }

    eglGetConfigAttrib(m_display, config, EGL_NATIVE_VISUAL_ID, &format);

    ANativeWindow_setBuffersGeometry(&window, 0, 0, format);

    static const EGLint contextAttribs[] =
    {
        EGL_CONTEXT_CLIENT_VERSION,
        2,
        EGL_NONE
    };
//  surface = eglCreateWindowSurface(m_display, config, &window, NULL);
    surface =  eglGetCurrentSurface(EGL_DRAW);


    if(m_context == EGL_NO_CONTEXT)
    {
        m_context = eglGetCurrentContext();
    }

    if (eglMakeCurrent(m_display, surface, surface, m_context) == EGL_FALSE)
    {
        Eegeo_ERROR("Unable to eglMakeCurrent");
        return false;
    }

    Eegeo_GL(eglQuerySurface(m_display, surface, EGL_WIDTH, &w));
    Eegeo_GL(eglQuerySurface(m_display, surface, EGL_HEIGHT, &h));

    Eegeo_TTY("%.2f , %.2f", w, h);

    m_surface = surface;

#ifdef EEGEO_DROID_EMULATOR
    m_sharedSurface = EGL_NO_SURFACE;
    m_resourceBuildSharedContext = EGL_NO_CONTEXT;
#else
    if(m_resourceBuildSharedContext == EGL_NO_CONTEXT)
    {
        m_resourceBuildSharedContext = eglCreateContext(m_display, config, m_context, contextAttribs);
    }

    EGLint pBufferAttribs[] =
    {
        EGL_WIDTH, 1,
        EGL_HEIGHT, 1,
        EGL_TEXTURE_TARGET, EGL_NO_TEXTURE,
        EGL_TEXTURE_FORMAT, EGL_NO_TEXTURE,
        EGL_NONE
    };

    EGLConfig sharedSurfaceConfig;
    if (!DefaultEGLChooser(m_display, EGL_PBUFFER_BIT, sharedSurfaceConfig))
    {
        Eegeo_ERROR("unabled to find a good pbuffer surface type");
    }

    m_sharedSurface = eglCreatePbufferSurface(m_display, sharedSurfaceConfig, pBufferAttribs);
#endif