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ac4af77973
vk_dlaa_fg_inputs hands out DLSS's new history with the frame's depth and motion, and FSR 4's and NVIDIA's frame generation pass it on, but vk_fg_frame dropped it: FSR 3.1 takes a cut only in the generation callback, which its swapchain calls later on its own thread. vk_fg_frame now notes each frame id's cut in a small ring (runtime/vk_fg_reset.h), and generate sets the callback's reset from it. A frame after one that was not prepared (the menu open, no inputs) counts as a cut too, and so does an id the ring no longer holds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
33 lines
1.8 KiB
C
33 lines
1.8 KiB
C
// Camera cuts for FSR 3.1 frame generation (vk_fg.cpp). DLSS starts a new history on a cut, another scene size or
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// another target, and vk_dlaa.c vk_dlaa_fg_inputs hands that out with the frame's depth and motion vectors. FSR 3.1
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// takes it only in the generation callback (ffxDispatchDescFrameGeneration.reset), which its swapchain calls later,
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// on its own present thread, for the frame id the configuration gave. So vk_fg_frame notes each frame's cut here
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// under its id, and the callback looks it up. Without it every generated frame of a cut was blended from two unrelated
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// pictures: an area load or a cutscene's cut flashed a frame of both.
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//
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// A ring of FGR_SLOTS frames; each slot holds the frame id and its cut as one atomic word, so a slot being rewritten
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// never pairs an old id with a new frame's answer. An id the ring no longer holds (the callback fell that far behind,
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// or the slot was never written) counts as a cut: a lost history costs one plain frame, a wrong one blends two.
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// Own header so tests/fg_reset_check.c checks it without a GPU.
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#pragma once
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#include <stdint.h>
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#define FGR_SLOTS 32
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typedef struct {
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uint64_t slot[FGR_SLOTS]; // (frame id << 1) | cut, written by vk_fg_frame; 0 never matches (ids start at 1)
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} FgrRing;
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// Frame ids above this do not fit beside the cut bit; they always count as a cut.
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#define FGR_MAX_ID (UINT64_MAX >> 1)
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static inline void fgr_note(FgrRing *r, uint64_t id, int cut) {
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if (id && id <= FGR_MAX_ID) __atomic_store_n(&r->slot[id % FGR_SLOTS], id << 1 | (cut != 0), __ATOMIC_RELEASE);
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}
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static inline int fgr_cut(const FgrRing *r, uint64_t id) {
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if (!id || id > FGR_MAX_ID) return 1;
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uint64_t v = __atomic_load_n(&r->slot[id % FGR_SLOTS], __ATOMIC_ACQUIRE);
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return v >> 1 != id || (v & 1);
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}
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