CODEWITHSUNDEEP
c++memoryopengl-es-2.0egl
CodingNinja
CodingNinja

Reputation: 65

Deleting EGL Opengles 2.0 properly

I've written a program that creates a window on WINCE and uses EGL to create the drawing surface and context. When this program quits, I have the following clean up routine: 

eglMakeCurrent(m_eglDisplay,EGL_NO_SURFACE,EGL_NO_SURFACE,m_eglContext);
eglDestroyContext(m_eglDisplay,m_eglContext);       
glDeleteProgram(m_eglProgramObject);
glReleaseShaderCompiler();

delete m_eglDisplay;
delete m_eglSurface;
delete m_eglContext;
delete m_eglConfig;

If I don't restart the target system, eventually the opening and closing of this program causes this following line to fail: 

m_eglContext = eglCreateContext(m_eglDisplay,m_eglConfig,EGL_NO_CONTEXT,arrContextAttrib);

With EGL error 12291 which apparently means EGL_BAD_ALLOC. I assume there's some memory related to EGL that isn't being deleted properly every time the program exits but don't know what this could possibly be. Any suggestions?

Upvotes: 2

Views: 3160

Answers (1)

Sami
Sami

Reputation: 155

To properly release your EGL and OpenGL 2.0 resources properly you have to make do following;

glDeleteProgram(m_eglProgramObject);

Delete any other GL resources created. For example textures, framebuffer, vertexbuffer, pixelbuffers etc

After this you have to do a eglmakecurrent with null surfaces and context. This will de-associate your EGLContext with the current thread (TLS)

eglMakeCurrent(m_eglDisplay,EGL_NO_SURFACE,EGL_NO_SURFACE, EGL_NO_CONTEXT );

After this you have to release all the EGLResources created:

eglDestroySurface(m_eglDisplay,m_eglSurface); 
eglDestroyContext(m_eglDisplay,m_eglContext);

In the end do the eglTerminate:

eglTerminate(m_eglDisplay);

If you have also created any platform window object, For example XDisplay for X11, wl_display for Wayland or AWindow for Android. You have to delete/destroy that also.

I hope it helps.

Upvotes: 2

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