Refactor ShaderRenderTester::validate() into focused helper methods

[ashwinbhat]

Break up the monolithic validate() into
initializeLogging(),
collectTestFiles(),
initializeGeneratorContext(), and
loadAndValidateDocument()

Refactoring was AI Assisted: Claude 4.6 Opus
Verfied Render test run and log contents are consistent except for timestamps.

genglsl_render_log_BEFORE.txt
genglsl_render_profiling_log_BEFORE.txt

genglsl_render_log.txt
genglsl_render_profiling_log.txt

[ashwinbhat]

@jstone-lucasfilm @bernardkwok @ppenenko The ShaderRenderTester::validate was getting too long. Refactoring it for ease of read.

[Copilot]

Pull request overview

Refactors ShaderRenderTester::validate() in the MaterialX render test utilities into smaller helper methods to improve readability and separation of concerns, while keeping test behavior/logging consistent.

Changes:

• Extracted logging setup into initializeLogging() and introduced LogStreams to manage file-backed streams.
• Extracted test discovery into collectTestFiles() and per-document work into loadAndValidateDocument() with a DocumentInfo return struct.
• Extracted generator/context initialization into initializeGeneratorContext().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
source/MaterialXTest/MaterialXRender/RenderUtil.h	Adds LogStreams / DocumentInfo structs and declares new helper methods used to break up validate().
source/MaterialXTest/MaterialXRender/RenderUtil.cpp	Implements the new helper methods and rewires validate() to use them.

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[jstone-lucasfilm]

Thanks for putting this proposal together, @ashwinbhat, and I've written up two initial thoughts.

[jstone-lucasfilm]

This seems like a very unusual pattern, where we're storing both unique pointers and direct references to the same objects.

Would it perhaps be better to provide accessors to these unique pointers, rather than storing them a second time?

[jstone-lucasfilm]

Although I like the idea of making each of these steps separable and focused, I feel that a helper method taking nine arguments is reducing the clarity of the separation, since it's so tightly coupled to the original monolithic design.

Could this perhaps be refactored further, either using a clearer split of the new helper methods, or context objects that wrap associated state variables in an intuitive way?

[kwokcb]

Bit hard to follow all the changes, but I think it would be easier to store state on the class instance vs passing arguments around. It would also help to isolate the new perfecto code as utility methods.

Something like: instance::startLogging(), logResult(), endLogging(), startPerf(), logPerf(), endPerf(). You could make it scoped to avoid missing closing "ends".

[kwokcb]

I noticed "AI gen" code tends to remove comments in code. Would be good to set a rule to prioritize not do so, and restore any ones removed currently.