For instructions on how to run glsl-reduce in conjunction with glsl-fuzz, see the glsl-reduce manual for reducing fuzzed shaders.
glsl-reduce [OPTIONS] SHADER_JOB INTERESTINGNESS_TEST
glsl-reduce takes a shader job SHADER_JOB, and an executable script INTERESTINGNESS_TEST that takes a shader job as an argument. INTERESTINGNESS_TEST must exit with code 0 when applied to the initial SHADER_JOB. glsl-reduce will then try to simplify the given shader job to a smaller, simpler shader job for which INTERESTINGESS_TEST still exits with code 0.
SHADER_JOB must be a .json file containing simply {}. (The role of this file is to provide metadata about shaders when glsl-reduce is used in conjunction with glsl-fuzz.) If the shader job is named foo.json, glsl-reduce will look for corresponding shaders named foo.frag, foo.vert and foo.comp, of which there must be at least one, and will apply reduction to all such shaders that are present. On termination, the reduced shader job will be named foo_reduced_final.json (with associated shader files).
Options relevant when the tool is used in stand-alone mode:
--timeout TIMEOUT Time in seconds after which checking
interestingness of a shader job is aborted.
(default: 30)
--max-steps MAX_STEPS The maximum number of reduction steps to take
before giving up and outputting the final reduced
file. (default: 250)
--verbose Emit detailed information related to the
reduction process. (default: false)
--seed SEED Seed with which to initialize the random number
that is used to control reduction decisions.
(default: -583088443)
--output OUTPUT Directory to which reduction intermediate and
final results will be written. (default: .)
--continue-previous-reduction
Carry on from where a previous reduction attempt
left off. Requires the temporary files written
by the previous reduction to be intact, including
the presence of a REDUCTION_INCOMPLETE file.
(default: false)