Fix FXAA pass ignoring RenderResolutionDivisor

[gwigz]

With FXAA antialiasing enabled and RenderResolutionDivisor >= 2, the FXAA pass would only write to the lower-left fraction of the reduced-resolution target.

Should help those that may want to keep render HiDPI on but render at a lower resolution.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: e8f3d2a0-e866-4dd6-9809-f4f3ac6f8218

📥 Commits

Reviewing files that changed from the base of the PR and between 03a5af0 and 11db3e8.

📒 Files selected for processing (1)

• indra/newview/pipeline.cpp

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Fixed FXAA anti-aliasing rendering behavior when render resolution divisor settings are applied, ensuring proper viewport handling during the presentation phase and preventing rendering artifacts.

Walkthrough

This PR adjusts the FXAA multisample rendering path in LLPipeline::applyFXAA to remove redundant viewport setup. Instead of explicitly calling glViewport() with full rectangle dimensions, the code now relies on the viewport already configured by dst->bindTarget(), preventing viewport mismatch when RenderResolutionDivisor scales the render target.

Changes

FXAA Multisample Viewport Fix

Layer / File(s)	Summary
Multisample FXAA viewport setup indra/newview/pipeline.cpp	Removes explicit glViewport() reset and adds comments clarifying that dst->bindTarget() already sets the correct viewport for the destination FBO, avoiding redundant calls that could conflict with scaled render targets.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A viewport once doubled and checked with great care,
Now trusts what bindTarget() has placed over there,
No redundant resets on this rendering day,
Just comments so clear light the viewer's way!

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	❓ Inconclusive	The PR description explains the issue and solution but lacks structured sections from the template; it's missing Related Issues link, detailed checklist items, and comprehensive documentation of testing.	Add the Related Issues section with a link to the bug report, complete the checklist items, and document testing steps taken to verify the fix.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main fix: resolving the issue where FXAA ignores RenderResolutionDivisor, which directly aligns with the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[RyeMutt]

LGTM