Thomas Sondergaard wrote:
Hi,
I stumbled upon mesa's gl_API.xml and the python scripts to process it
to generate glx indirect rendering c-code. I've used these bits to
generate an opengl tracer, that I thought might be useful for other
people than me. The tracer is used like this:
LD_PRELOAD=/path/to/gltrace.so glxgears
The tracer can be configured using environment variables to log all
opengl calls to a logfile or to call glGetError after all OpenGL calls
and print the error and the stack trace when errors occur. Of course
there is a significant overhead involved in snooping all OpenGL calls,
but it is good support for debugging.
The attached gltrace.py generates c++ source that depends on a few
logging macros and a function for obtaining the current stack trace that
is not included, but they are mainly convenience wrappers around c++
iostreams and backtrace_symbols from <execinfo.h>.
I thought gltrace might be a candidate for inclusion as a utility in
Mesa. If there is interest I could polish it up so other people can
compile it than me :-)
This could certainly be useful. I have some code in the
main/dispatch.c file that can be enabled to echo the GL calls to
stdout, but it requires recompiling.
I'd be happy to include this in Mesa. Could you do a few more things
though:
1. Update the comments to include your name in the Authors list.
2. Maybe include an option to omit the date/hostname/process ID from
the output. Also, add a semicolon at the end of the line so that a
trace can be copied and pasted into a C program for testing/debugging
(I realize pointer-valued functions won't work).
3. Make a short README file (txt or html) that I can include in the
docs that explains how to build/use the tracer.
-Brian
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