p#604 Fix draw range fluctuations

[akleshchev]

Instead of using memory directly, use a 'factor' that has a 150MB wide 'rest' state to avoid draw range fluctuations from memory fluctuations.

[Copilot]

Pull request overview

This PR reduces draw-distance “thrashing” caused by short-term system-memory fluctuations by introducing a smoothed/hysteresis-based system-memory “budget factor” and using that factor (instead of instantaneous critical-memory checks) when clamping draw distance in multiple subsystems.

Changes:

• Add and maintain a persistent sSysMemoryFactor (clamped 1.0–2.0) in LLViewerTexture::updateClass() to smooth system-memory pressure over time.
• Switch draw-distance limiting logic in VO cache debug tuning and send_agent_update() from isSystemMemoryCritical() to getSystemMemoryBudgetFactor() > 1.f.
• Slightly widen the texture debug UI elements to accommodate updated display/layout needs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
indra/newview/llvocache.cpp	Uses the smoothed system-memory budget factor to clamp draw radius in VO cache debug settings.
indra/newview/llviewertexture.h	Declares the system-memory budget factor API and new static state used to smooth memory pressure.
indra/newview/llviewertexture.cpp	Implements the hysteresis/ramp logic that updates sSysMemoryFactor and returns it via getSystemMemoryBudgetFactor().
indra/newview/llviewermessage.cpp	Uses the budget factor (instead of instantaneous “critical” memory) to limit requested draw distance in agent updates.
indra/newview/lltextureview.cpp	Widens the texture progress bar in the debug texture view.
indra/newview/lldebugview.cpp	Widens the texture debug view rect to match the updated texture view layout.

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