Comment 1 for bug 855524

Things I've found out: One glproxy test, triangle, produces exactly the same error. But another one, egl_tfp, does not. The difference seems to be that egl_tfp creates the window, eglContext and eglSurface before calling glProxyInit, while triangle initializes after calling it.

As glproxy creates an eglContext and an eglSurface during glProxyInit, it's possible that the error comes from the EGL implementation on panda not supporting having different contexts.