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glNick
12-26-2012, 03:47 PM
I am developing for Android using opengl/egl. My app requires a second context for loading textures from a second thread.

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.

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.

This is the initialization code:



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());


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.

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.

any help would be greatly appreciated,

Thanks,
Nick