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VRAM: alias transient render targets that are never alive at the same time #615

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opened 2026-10-10 01:15:50 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-10 01:15:50 +00:00

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Inventory every render target with its first / last use in the frame (including async-compute and frame-pipelined work, probe / mirror / snapshot recordings).
Place non-overlapping transient targets in shared memory (Vulkan memory aliasing), with correct barriers and initial layouts (UNDEFINED on first use), and no aliasing of anything read across frames (history, TAA / FSR / shadow history, persistent caches).
Report the saving per resolution.
Expected: 25-40% of render target memory.

Render targets were 362 MB on an RTX 3070 user's 2479x1077 window (more at 4K). Many are transient: alive only for part of the frame (e.g. post-processing intermediates, motion blur / DoF / bloom scratch, SSR / SSAO intermediates, upscaler inputs). Images whose lifetimes do not overlap can share memory. ## Do - Inventory every render target with its first / last use in the frame (including async-compute and frame-pipelined work, probe / mirror / snapshot recordings). - Place non-overlapping transient targets in shared memory (Vulkan memory aliasing), with correct barriers and initial layouts (UNDEFINED on first use), and no aliasing of anything read across frames (history, TAA / FSR / shadow history, persistent caches). - Report the saving per resolution. - Expected: 25-40% of render target memory.

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2026-10-10 01:15:50 +00:00

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2026-10-10 01:15:50 +00:00

sky_line referenced this issue

2026-10-10 01:20:14 +00:00

VRAM (later): quantize skinned positions (16-bit per-instance box) as a pressure-only ladder rung #617

sky_line referenced this issue from a commit

2026-10-10 03:31:53 +00:00

Alias the G-buffer with the bloom pyramid + cross filter (#615)

sky_line referenced this issue from a commit

2026-10-10 03:31:53 +00:00

Alias arena: keep dead slots' last requirement in the plan (#615)

sky_line referenced this issue

2026-10-10 03:37:42 +00:00

RT shadows: foliage shimmers under FSR with the half-res shadow mask; full res fixes it but costs ~1.3 GB at 4K #625

sky_line referenced this issue

2026-10-10 04:53:21 +00:00

Explore: further texture memory reductions (RAM + VRAM) #263

sky_line commented

2026-10-10 05:32:58 +00:00

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Done. Transient render targets alias one memory arena: G-buffer aliased with the bloom pyramid and cross filter (af8aac9ab5), last-requirement fix (ed819b3649). Owner verified in-session. Shipped in 1.2.0 (v1.2.0, 55f4242518).

Done. Transient render targets alias one memory arena: G-buffer aliased with the bloom pyramid and cross filter (af8aac9ab5), last-requirement fix (ed819b3649). Owner verified in-session. Shipped in 1.2.0 (v1.2.0, 55f4242518).

sky_line

2026-10-10 05:32:58 +00:00

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sky_line referenced this issue from a commit

2026-10-16 17:53:48 +00:00

Split deferred lighting: shrink the intermediates 24 -> 16 B/px, alias them

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