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a0f5435854
Alpha testers reported the 3D-highway "quality going up and down to try to compensate" as passages got busier (#618 charrette). That's core's load-adaptive render scale (_adaptRenderScale, #654) ping-ponging across the 7-12ms deadband: it downscales when a busy frame blows the budget, then the now-cheaper frame dips under the low watermark so it upscales, which blows the budget again — a visible resolution pop on a loop. Fix: keep downscaling prompt (protect the frame rate), but make UPSCALING lazy and predictive: - smaller up-step (x1.06 vs x1.1) on a longer, separate cooldown (_AUTO_UPSCALE_COOLDOWN_MS = 2500ms vs the 600ms general adjust cooldown), reset on any downscale so we never bounce straight back up; - a predictive guard: only upscale when the projected cost AFTER the step (~cost * step^2, since draw cost tracks pixel count) still clears the high budget. The scale settles just inside the deadband instead of oscillating. No public API change; the user-facing "Min res" floor (_autoScaleMin) is untouched. Pairs with the in-plugin AA-under-bloom fix in feedBack#618. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>