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Fix doubled stereo image on UE 5.5/5.6 (zero-based eye index misclassified as full pass) #422

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Fix doubled stereo image on UE 5.5/5.6 (zero-based eye index misclassified as full pass) #422

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7 changes: 6 additions & 1 deletion src/mods/vr/FFakeStereoRenderingHook.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4652,7 +4652,12 @@ __forceinline void FFakeStereoRenderingHook::calculate_stereo_view_offset(
index_starts_from_one = false;
}

const auto is_full_pass = view_index == 0 && !index_was_ever_two && !index_was_ever_negative;
// On UE5 (detected via double-precision LWC math) eye indices are always 0/1 and a genuine
// mono/full pass arrives as INDEX_NONE (-1), which is already ignored above. UE <= 5.4
// happened to send -1 (or 2) early enough to flip the flags below, but UE 5.5/5.6 only ever
// sends 0/1 - leaving view 0 permanently misclassified as a "full pass", which skips per-eye
// transforms/callbacks for one eye only and produces a heavily doubled image.
const auto is_full_pass = view_index == 0 && !index_was_ever_two && !index_was_ever_negative && !g_hook->m_has_double_precision;

auto true_index = index_starts_from_one ? ((view_index + 1) % 2) : (view_index % 2);
const auto has_double_precision = g_hook->m_has_double_precision;
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