fix(vr): restore PerfMode/foveated DLSS output height

[alandtse]

Problem

The v1.7.0 upstream sync (#121) — specifically the VR-restore revert 47821fa6a ("Revert 'remove all VR support (community-shaders#2475)'") — re-applied upstream's plain dlssOptions.outputHeight = state->screenSize.y immediately after the fork's PerfMode/foveation-aware line in Streamline::SetDLSSOptions, silently clobbering it:

dlssOptions.outputHeight = height != 0 ? height
    : (dlssperfActive ? (uint)perfMode.GetDisplayScreenSize().y : (uint)state->screenSize.y);  // fork (intended)
dlssOptions.outputWidth  = width;                       // <- re-added by the revert
dlssOptions.outputHeight = (uint)state->screenSize.y;   // <- clobbers the line above

Confirmed via git show 47821fa6a -- src/Features/Upscaling/Streamline.cpp (the two lines are + additions from that commit).

Impact

Under PerfMode (renderAtUpscaleRes), state->screenSize.y is the renderRes-polluted spoofed HMD size, so DLSS was told a renderRes output height that no longer matches the displayRes output extent. NGX requires outputHeight == extentOut.height (documented in the comment directly above the clobbered line) or it zeroes the output. The clobber also discards the FoveatedRender subrect height passed via height.

Fix

Remove the duplicate so the intended height reaches NGX:

• DisplayRes under PerfMode,
• subrect height under FoveatedRender,
• screenSize otherwise.

Net -3 lines; restores the behavior that shipped before the sync.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9ba726a and 46e5978.

📒 Files selected for processing (1)

• src/Features/Upscaling/Streamline.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/dlss-output-height-clobber

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Pull request overview

Restores VR-specific DLSS output height selection in Streamline::SetDLSSOptions by removing a duplicate assignment that overwrote the intended PerfMode/foveated-aware height, which could cause NGX to produce zeroed output when outputHeight mismatched extentOut.height.

Changes:

• Removes a redundant dlssOptions.outputHeight = state->screenSize.y assignment that clobbered the PerfMode/foveated-aware output height.
• Removes a redundant dlssOptions.outputWidth = width line (already set immediately prior).

[github-actions]

No actionable suggestions for changed features.

[github-actions]

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