[BUG]: The Suffering Ties That Bind - Missing Light Bloom

[MrCK1]

Describe the Bug

In this area of the game, the light bloom is significantly reduced. It is much brighter in SW mode. All HW renderers exhibit the issue, HW hacks do not help.

Reproduction Steps

Launch game and start level "Unholy Burden", navigate to movie theater and observe.

Expected Behavior

Bloom should match SW.

PCSX2 Revision

v1.7.4871

Operating System

Windows 11

CPU

Ryzen 7900X

GPU

RTX 4090

GS Settings

Defaults

Emulation Settings

Defaults

GS Window Screenshots

SW:

HW:

Logs & Dumps

tsttb_movietheater.zip (rename to .GS)

[refractionpcsx2]

from what I can tell the problem is the sampling doesn't return the right values when bilinear sampling is done.

On software it seems to do 1:1 pixel mapping, the filtering doesn't seem to have any effect, but on hardware, the pixels become different. The one I picked at random on the texture had an alpha of 0.5088 (or 128.99 aka 129), where the sampled alpha was 0.5039 aka 128.49 which will be come 128, and the game does an alpha test for GREATER THAN 128, so most of the lighting disappears.

I'm not sure if hardware bilinear just calculates differently or something, but changing the formula for conversion just broke a bunch of stuff, so we can't do that.

Here's a picture from my PS2 for prosperity.