Question

我正在使用OpenGL ES 2.0和Android NDK r8b。我有一个用于工作线程的共享上下文。当我尝试使用eglMakeCurrent将共享上下文绑定到工作线程时，我得到错误EGL_BAD_ALLOC。

现在让我感到困惑的是，这段代码在以前工作得很好......我不知道我做了什么来打破它...... EGL文档说这个错误与资源不可用有关，但我正在运行曾经在这个完全相同的设备上完美运行的相同应用程序，并且所有纹理从主线程加载得很好。

那么可能导致这个错误的原因是什么？

这是我的egl初始化：

bool Initialize(void *displaySurface)
{
    assert(displaySurface);
    ANativeWindow *window = (ANativeWindow*)displaySurface;

    EGLint dummy, format;

    display = eglGetDisplay(EGL_DEFAULT_DISPLAY);

    eglInitialize(display, 0, 0);

    const EGLint configAttribs[] =
    {
        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_BLUE_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_RED_SIZE, 8,
        EGL_ALPHA_SIZE, 8,
        EGL_BUFFER_SIZE, 32,
        EGL_DEPTH_SIZE, 24,
        EGL_NONE
    };

    const EGLint auxConfigAttribs[] =
    {
        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_BLUE_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_RED_SIZE, 8,
        EGL_ALPHA_SIZE, 8,
        EGL_BUFFER_SIZE, 32,
        EGL_DEPTH_SIZE, 24,
        EGL_NONE
    };

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

    EGLint numConfigs;
    EGLConfig config;

//// create main context
    eglChooseConfig(display, configAttribs, &config, 1, &numConfigs);
    Trace("eglChooseConfig: " + GetEglError());

    eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
    Trace("eglGetConfigAttrib: " + GetEglError());

    ANativeWindow_setBuffersGeometry(window, 0, 0, format);
    Trace("ANativeWindow_setBuffersGeometry: " + GetEglError());

    surface = eglCreateWindowSurface(display, config, window, NULL);
    Trace("eglCreateWindowSurface: " + GetEglError());

    context = eglCreateContext(display, config, EGL_NO_CONTEXT, contextAttribs);
    Trace("eglCreateContext: " + GetEglError());

//// create auxiliary context
    eglChooseConfig(display, auxConfigAttribs, &config, 1, &numConfigs);
    Trace("AUX eglChooseConfig: " + GetEglError());

    auxSurface = eglCreatePbufferSurface(display, config, NULL);
    Trace("AUX eglCreatePbufferSurface: " + GetEglError());

    auxContext = eglCreateContext(display, config, context, contextAttribs);
    Trace("AUX eglCreateContext: " + GetEglError());

//// make main context current
    eglMakeCurrent(display, surface, surface, context);
    Trace("eglMakeCurrent: " + GetError());

    eglQuerySurface(display, surface, EGL_WIDTH, &width);
    eglQuerySurface(display, surface, EGL_HEIGHT, &height);

    SetViewport(width, height);

    EnableDepthBuffer(enableDepthTest);
    EnableBackfaceCulling(enableBackfaceCull);
    SetBackgroundColor(backgroundColor);

    glDisable(GL_DITHER);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    Trace("finished" + GetEglError());

    alive = true;

    return true;
}

编辑：我可能是错的，但是这个错误似乎是在ndk工具链更新的同时出现的......但我无法测试这个理论，因为我没有任何旧的副本ndk了。所以，如果有人链接到我可以获得NDK 7c，那也会有所帮助。

Answer 1

好吧，似乎问题是PBuffer需要至少1x1像素才能工作，而EGL_WIDTH和EGL_HEIGHT的默认值为0。

获胜的配置：

bool Initialize(void *displaySurface)
{
    assert(displaySurface);
    ANativeWindow *window = (ANativeWindow*)displaySurface;

    EGLint dummy, format;

    display = eglGetDisplay(EGL_DEFAULT_DISPLAY);

    eglInitialize(display, 0, 0);

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

//// create main context
    const EGLint configAttribs[] =
    {
        EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
        EGL_BLUE_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_RED_SIZE, 8,
        EGL_ALPHA_SIZE, 8,
        EGL_BUFFER_SIZE, 32,
        EGL_DEPTH_SIZE, 24,
        EGL_NONE
    };

    EGLint numConfigs;
    EGLConfig config;

    eglChooseConfig(display, configAttribs, &config, 1, &numConfigs);
    Trace("eglChooseConfig: " + GetEglError());

    eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
    Trace("eglGetConfigAttrib: " + GetEglError());

    ANativeWindow_setBuffersGeometry(window, 0, 0, format);
    Trace("ANativeWindow_setBuffersGeometry: " + GetEglError());

    surface = eglCreateWindowSurface(display, config, window, NULL);
    Trace("eglCreateWindowSurface: " + GetEglError());

    context = eglCreateContext(display, config, EGL_NO_CONTEXT, contextAttribs);
    Trace("eglCreateContext: " + GetEglError());

//// create auxiliary context

    const EGLint auxConfigAttribs[] =
    {
        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
        EGL_BLUE_SIZE, 8,
        EGL_GREEN_SIZE, 8,
        EGL_RED_SIZE, 8,
        EGL_ALPHA_SIZE, 0,
        EGL_DEPTH_SIZE, 0,
        EGL_STENCIL_SIZE, 0,
        EGL_NONE
    };

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

    EGLint auxNumConfigs;
    EGLConfig auxConfig;

    eglChooseConfig(display, auxConfigAttribs, &auxConfig, 1, &auxNumConfigs);
    Trace("AUX eglChooseConfig: " + GetEglError());

    auxSurface = eglCreatePbufferSurface(display, auxConfig, pbufferAttribs);
    Trace("AUX eglCreatePbufferSurface: " + GetEglError());

    auxContext = eglCreateContext(display, auxConfig, context, contextAttribs);
    Trace("AUX eglCreateContext: " + GetEglError());

//// make main context current
    eglMakeCurrent(display, surface, surface, context);
    Trace("eglMakeCurrent main: " + GetError());

    eglQuerySurface(display, surface, EGL_WIDTH, &width);
    eglQuerySurface(display, surface, EGL_HEIGHT, &height);

    SetViewport(width, height);

    EnableDepthBuffer(enableDepthTest);
    EnableBackfaceCulling(enableBackfaceCull);
    SetBackgroundColor(backgroundColor);

    glDisable(GL_DITHER);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    Trace("finished" + GetEglError());

    alive = true;

    return true;
}

为什么eglMakeCurrent失败了EGL_BAD_ALLOC？

1 个答案: