Re: [Mesa3d-users] undefined symbol in egl/egl_x11_swrast.so and init problems

[Chia-I Wu <ol...@gm...>]

On Fri, Mar 12, 2010 at 6:02 AM, Andreas Pokorny
<and...@gm...> wrote:
> 2010/3/11 Chia-I Wu <ol...@gm...>:
>> On Thu, Mar 11, 2010 at 10:06 PM, Andreas Pokorny
>> <and...@gm...> wrote:
>>> I work on: b8656c4825b9e054f05258773ba012e41d4fcdee
>>> I have two rather strange problems using egl. I have implemented a
>>> egl/es2/libX11 based renderer shared object file. The shared object
>>> file gets loaded and initialized using dlopen/dlsym. Then when the
>>> renderer is supposed to initialize EGL, and to create a window I run
>>> into runtime symbol lookup errors.
>>> ./Startup: symbol lookup error: /usr/local/lib/egl/egl_x11_swrast.so:
>>> undefined symbol: _eglInitDriverFallbacks
>> It seems _eglInitDriverFallbacks in libEGL.so is not resolved when
>> egl_x11_swrast.so is loaded.  I am not quite sure about your setup (who dlopen
>> who?).  Do you have a sample code that reproduces your setup or the issue?
> My applicatin dlopens a shared object files that links against EGL and
> ES2. I was just writing a sample code that turns progs/es2/xegl/tri.c
> into a shared library. Then I dlopen the lib with
> dlopen(RTLD_LAZY|RTLD_LOCAL);  - and then i try to execute an exported
> function of tri.c (turned main into a function with visibility
> default) as it seems RTLD_LOCAL causes the issue. I have to use
> RTLD_GLOBAL instead.  So now it works.
> I have no idea why i used RTLD_LOCAL in the first place.
Glad you solved your problem.  dlopen()ing is one of the part in EGL that I
haven't looked at.  I don't have enough experiences on various setups or Unixes
to say that EGL is doing the right thing.
>>> When I add the following to the makefiles - it seems to work.
>>>
>>> --- a/src/gallium/winsys/drm/swrast/egl/Makefile
>>> +++ b/src/gallium/winsys/drm/swrast/egl/Makefile
>>> @@ -3,7 +3,7 @@ include $(TOP)/configs/current
>>>
>>>  EGL_DRIVER_NAME = swrast
>>>  EGL_DRIVER_SOURCES = dummy.c
>>> -EGL_DRIVER_LIBS =
>>> +EGL_DRIVER_LIBS = -lEGL
>>>
>>>  EGL_DRIVER_PIPES = \
>>>        $(TOP)/src/gallium/winsys/drm/swrast/core/libswrastdrm.a \
>>>
>>> Then the eglInitialize() command still fails because of something else.
>>>
>>> When I run the application with the following settings:
>>> EGL_DRIVER=egl_x11_swrast
>>> EGL_SOFTWARE=1
>>> EGL_DISPLAY=x11
>>> EGL_LOG_LEVEL=debug
>>>
>>> I get:
>>>
>>> libEGL debug: dlopen(/usr/local/lib/egl/egl_x11_swrast.so)
>>> libEGL info: use software fallback
>>> libEGL warning: No supported client API
>>> libEGL debug: no state tracker supports config 0x21
>>> ... till ...
>>> libEGL debug: no state tracker supports config 0x98
>>> libEGL debug: EGL user error 0x3001 (other) in eglInitialize(unable to
>>> add configs)
>>> The demos in mesa/progs/egl give me the same output. While the demos
>>> in mesa/progs/{es2,es1}/xegl and work. Any ideas what I am doing
>>> wrong?
>> From which directory do you build your libGL?  You need to use the one from
>> src/gallium/winsys/xlib (or src/gallium/targets/libgl-xlib/ in today's git).
>> Have a look at the OpenGL section in docs/egl.html.
> I did not build libGL, I was only interested in EGL and GLES1/ES2 and
> VG. Do I have to build GL?
No.  Only if you want to run the demos under progs/egl/.

-- 
ol...@Lu...