Mack Core
ed02f3a2ce
The color/depth alias collapse heuristic at get_framebuffer_layout()
picks depth whenever depth_test_enabled or stencil_test_enabled is set.
But test means read, not write - so deferred renderers that run a
Z-prepass and then a G-buffer pass with depth-test ON, depth-write OFF,
color-write ON get classified as a depth pass even though they're
writing color. The color writes get silently dropped.
In Starhawk this killed every lit surface - characters, skybox, anything
that goes through the deferred lighting path rendered black or
invisible. Terrain, particles, and emissive geometry kept working
because they don't go through that same pipeline.
Fix is to check writes instead of tests:
if (zeta_write_enabled && !color_write_enabled)
keep_as_depth(); // Z-prepass, shadow gen
else
keep_as_color(); // G-buffer / lit pass
For the both-writes case I went with color since losing color is much
more obvious visually than losing depth (the engine's Z-prepass usually
still has the depth around).
Tested with Starhawk [BCUS98181] in menu and gameplay - before: missing
characters and sky. After: matches PS3 reference. Logged every aliasing
event during a couple minutes of gameplay and they were all the G-buffer
pattern (depth-test ON, depth-write OFF, color-write ON), all handled
right. The depth-keep branch wasn't actually exercised in Starhawk, but
it's there for games that do use a Z-prepass to an aliased buffer.
Fixes #11877.
RPCS3
The world's first free and open-source PlayStation 3 emulator/debugger, written in C++ for Windows, Linux, macOS and FreeBSD.
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