为什么 eglMakeCurrent() 因 EGL_BAD_MATCH 而失败? [英] Why is eglMakeCurrent() failing with EGL_BAD_MATCH?

问题描述

我正在使用 opengl/egl 为 Android 开发.我的应用需要第二个上下文来从第二个线程加载纹理.

I am developing for Android using opengl/egl. My app requires a second context for loading textures from a second thread.

我的代码在 android 2.3 上运行良好，但是当我在 4.0.3 android 设备或模拟器上尝试该代码时，eglMakeCurrent() 失败并显示 EGL_BAD_MATCH.

My code works fine on android 2.3, but when I try the code on a 4.0.3 android device or emulator, eglMakeCurrent() fails with EGL_BAD_MATCH.

第二个上下文的初始化和它的像素缓冲区也都工作正常，所以我不确定从哪里开始寻找这个错误.

The initialization of the second context and it's pixel buffer all works fine too, so I am not sure where to begin looking for this error.

这是初始化代码:

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
};

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);
eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
ANativeWindow_setBuffersGeometry(window, 0, 0, format);

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

context = eglCreateContext(display, config, EGL_NO_CONTEXT, contextAttribs);
if(context == NULL)
    Trace("error creating main context: " + GetEglError());

const EGLint auxConfigAttribs[] =
{
    EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
    EGL_BLUE_SIZE, 8,
    EGL_GREEN_SIZE, 8,
    EGL_RED_SIZE, 8,
    EGL_ALPHA_SIZE, 8,
    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);

auxSurface = eglCreatePbufferSurface(display, auxConfig, pbufferAttribs);
if(auxSurface == NULL)
    Trace("error creating pbuffer surface: " + GetEglError());

auxContext = eglCreateContext(display, auxConfig, context, contextAttribs);
if(auxSurface == NULL)
    Trace("error creating auxilliary context: " + GetEglError());

if(!eglMakeCurrent(display, surface, surface, context))
    Trace("could not make main context current: " + GetEglError());

在我的 Android 2.3 设备(HTC Desire)上，上面的初始化代码完美运行，我可以将 auxContext 设为当前，并且加载纹理就好了.

On my Android 2.3 device(HTC Desire), the above initialization code works perfectly, and I can make the auxContext current, and load textures just fine.

但是，在我的 android 4.0.3 设备(Samsung Nexus S)和我的 Android 4.1 设备(Galaxy Note 2)上，eglMakeCurrent() 在成功初始化后失败并显示 EGL_BAD_MATCH.

BUT, on my android 4.0.3 device(Samsung Nexus S) and my Android 4.1 device (Galaxy Note 2) eglMakeCurrent() fails with EGL_BAD_MATCH after a successful initialization.

有人知道我为什么会收到这个错误吗?

Does anyone know why I may be getting this error?

推荐答案

啊，我其实知道一些事情.;) [花费了 5 年中最好的部分来研究各种 EGL 实施].

Ah, something I actually know something about. ;) [Having spent best part of 5 years working on various EGL implementations].

我很确定您的 surface 与实际显示表面的格式不同.我不确定到底有什么区别，或者你需要改变什么.EGL_DEPTH_SIZE 也许?您可以尝试枚举可用的模式，看看是否有可能".我知道，这有点痛苦，但我过去曾做过几次——不同之处在于我通常可以查看 EGL 源代码并找出我做错了什么......;)

I'm pretty certain your surface is a different format to the actual display surface. I'm not sure exactly WHAT the difference would be, or what you need to change. EGL_DEPTH_SIZE perhaps? You could try enumerating the modes that are available and see if any look "likely". I know, it's a bit of a pain, but I've been there done that a few times in the past - with the difference that I could usually look through the EGL source code and figure out what I'd done wrong... ;)

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