chrg6 1c3fa7df2a Give Streamline constants and null tags on a frame without inputs while frame generation is on. ...

A review of the DLSS and frame generation paths against NVIDIA's guides (the DLSS programming guide 310.6.0, the
DLSS-FG guide 310.7.0, Streamline 2.14.16's guides and headers).

What follows them: the texture bias (log2(render width / output width) - 1 on top of the game's own, at each change
of the mode), the jitter (Halton, 8 x (output / render)^2 phases and 16 at least, in render pixels within half a
pixel, the scene drawn with it and the motion vectors made without it), the creation flags (HDR, vectors at the
render size, auto-exposure, depth not inverted) and the constants Streamline gets (unjittered matrices, the jitter
in pixels, the vectors' scale of one over the render size).

What did not: vk_dlssg.c holds a change of generation's state for FG_SETTLE_FRAMES frames, so for up to 12 frames
after the depth, the motion vectors or the camera went away (a menu, a fade, a load) generation stayed on and
nx2sl_frame set no constants and tagged nothing. Streamline's guide asks for the constants at every frame and for
null tags where depth or motion vectors are not valid; it logged "Unable to find 'common' constants for frame" and
"Failed to find global tag 'kBufferTypeDepth'" and used the frame before's (in every play log with frame
generation). Such a frame now gets the last frame's constants with reset set and the three tags as null. Not run in
a game yet: nx2navi_dlssg.dll builds and exports its 15 functions.

What the guides leave open: the sign of the jitter offsets against the shift of the picture, which NVIDIA says to
find by trying, and the bias reaches only the tiled, trilinear samplers, not every texture of the scene. For both
there is a test switch now, read once: NX2NAVI_DLAA_JITTER_TEST=<x>,<y> tells the upscaler the jitter times two
factors, and NX2NAVI_DLSS_LOD_BIAS_TEST=<bias> puts a bias in the rule's place. Neither was measured: the runs
that would do it start the game.

The line about the presents a second (the commit before) came at 59 a second under a limit of 60: it comes under 56
now.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

2026-11-14 12:54:08 -05:00

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