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

[Andreas P. <and...@gm...>]

Hi,

2010/3/11 Chia-I Wu <ol...@gm...>:
> On Thu, Mar 11, 2010 at 10:06 PM, Andreas Pokorny
> <and...@gm...> wrote:
>> Hi,
>>
>> 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.

>> 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?

regards
Andreas Pokorny