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https://github.com/RetroPortingToolKit/psxrecomp
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Shokunin
e730e03a8a
[video] bloom = 0.0 (off, default) .. 2.0 adds a glow around lights on the
OpenGL backend. PSX_BLOOM overrides it for one run; {"cmd":"bloom"} reads or
changes strength, threshold and a debug view live. It is a plain [video] key,
so [quality.*] presets can switch it off on low-end machines.
The HUD never glows: with bloom on every textured and untextured draw is
followed by two stencil-only passes of the same vertices that keep a
"may glow" mark in stencil bit 1 (bit 0 stays the mask-bit mirror). Opaque
primitives clear it under their coverage, then PGXP-proven 3D primitives and
additive semi-transparent texels/primitives (modes 1 and 3) set it, painter
ordered like the colour; 3D and non-3D primitives never share a batch while
bloom is on. Semi-transparent primitives leave the mark alone and the PGXP
depth-clear pass (colour writes off) marks nothing. Without PGXP geometry only
additive primitives glow.
The pass runs on the composed game image before AA and the OSD: the presented
surface's marks are blitted into a quarter-resolution stencil, a soft-knee
bright pass runs under it, three separable Gaussian iterations spread it and a
screen blend adds it back. The marks follow the picture: native-wide centre
copies and Smooth motion surfaces (redraw and reprojection) copy stencil with
colour, and generated frames get the same pass. Off: nothing runs, no state
changes, and the composed frame is byte-identical to master.
test_gl_bloom (gl_bloom_test): off is byte-identical before/after bloom and
with --dump against master; on, a bright 2D panel and a panel over a lit 3D
polygon are byte-identical to off, an additive and a 3D polygon glow; guest
VRAM is unchanged; on this thread and on the render thread.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>