PPSA11386 registers 3840x2160 tiled display buffers in pixel format
0xC001000622000000, R16G16B16A16 float in KytyPS5 and SharpProspero
(0xC001000600000000 is the blue-first variant), and stops on "VideoOut:
unsupported display pixel format". The buffer is eight bytes per texel; its
tiled layout is assumed to be the 8-byte SW_64KB_R_X equation applied to
full coordinates, as addrlib applies it. The values are taken as linear
light and encoded with the sRGB curve for the 8-bit output. The encoding
compares the raw half-float bits against two tables of 255 thresholds
(color and alpha) that the CPU decode and the color transfer shader share,
so both give the same bytes on any driver; negative and NaN values give 0.
Guest-memory detile, the resident image path and the CPU decode all handle
both formats; DCC metadata on a float buffer throws. Neither the layout nor
the transfer is verified against console frames.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fnrk5Dazjb2tLooVSpdRQq
PPSA21564's final composite renders into 4K 10-bit scanout buffers
(COLOR_2_10_10_10 with the alternate swap, A2R10G10B10). No guest texture
format matched that color format, so the target stayed non-resident:
every frame's composite draw ran synchronously (about 11 ms, 143 per 10 s
at the title) and the flip read the frame back through guest memory.
The blue-low 10-bit color target now keeps its bits in the storage image
of its surface's red-low 2-10-10-10 format, as B8G8R8A8 targets map to
R8G8B8A8.
Presenting it: DisplayTexelFormat names a display buffer's texel order as
the guest-memory path reads it (R8G8B8A8 base: red low, else blue low;
the 10-bit variant: A2B10G10R10 or A2R10G10B10). ResidentPresentPath
blits a resident image only when it holds the display's 8-bit texel
format (an exact copy). A 10-bit image (whose blit would round where the
guest path drops the low two bits), the other 8-bit order or an sRGB type
is converted instead: GpuColorTransfer::DetileImage copies the image's
texels raw and runs the guest path's own conversion shader on them, so
both paths present the same pixels.
The image's write-back is unchanged: its results stay pending like any
resident target's and are stored when a reader of the memory flushes
them.
Tests: agc_driver_recorder_tests checks the format decision for both
8-bit and both 10-bit orders, and converts an image in each order,
comparing it with the CPU decode and the GPU detile of the same words in
guest memory.
Jan Šlégl
Dean Galvin