These directory contains tools for manipulating traces produced by the trace
pipe driver.
Most debug builds of gallium frontends already load the trace driver by default.
To produce a trace do
export GALLIUM_TRACE=foo.gtrace
and run the application. You can choose any name, but the .gtrace is
recommended to avoid confusion with the .trace produced by apitrace.
You can dump a trace by doing
./dump.py foo.gtrace | less
You can dump a JSON file describing the static state at any given draw call
(e.g., 12345) by
doing
./dump_state.py -v -c 12345 foo.gtrace > foo.json
or by specifying the n-th (e.g, 1st) draw call by doing
./dump_state.py -v -d 1 foo.gtrace > foo.json
The state is derived from the call sequence in the trace file, so no dynamic
(eg. rendered textures) is included.
You can compare two JSON files by doing
./diff_state.py foo.json boo.json | less
If you're investigating a regression in an gallium frontend, you can obtain a good
and bad trace, dump respective state in JSON, and then compare the states to
identify the problem.
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