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kuba
20eda4443c
* Shader: read a wave mask consumed as a per-lane predicate at the lane bit A VCC/EXEC wave mask consumed as a per-lane predicate (the VCndmask condition, a VCC/EXEC branch, or the derived _vcc/_exec bool) was tested in single-lane emulation with a whole-word non-zero test (IsNotZero64) instead of the current lane's bit. That is correct for comparison results (only the lane's own bit is ever set) but wrong for bitwise-complement wave-mask idioms (S_NOT / S_ORN2 / S_ANDN2 / S_NAND / S_NOR), which set the unused upper 63 bits: a whole-word test then reports the lane active even when its bit is clear. Unity's PostProcessing NaN killer does exactly this: per channel it computes isNaN = NLT AND NGT AND NEQ (against 0), then combines the channels as anyNaN OR NOT(v3-is-finite) via S_ORN2_B64. The complement set the upper mask bits, so every valid pixel read as NaN and was replaced with 0, zeroing the whole HDR scene before Bloom/Uber/tonemap. The 3D scene therefore rendered black behind the menu while the UI survived. Extract the current lane's bit in both single-lane and subgroup modes so IsWaveMaskActive matches the hardware. Fixes Superliminal (PPSA06084) black 3D scene: the storage room now renders behind the menu with natural exposure and no forced values. (cherry picked from commit 7af6f4b6f314fe302619c0d44f4db00971c5bf24) * test: wave-mask predicate is tested at the current lane bit Regression test for the wave-mask lane-bit fix. Compiles a shader that writes VCC at run time (V_CMP_EQ_F32) and asserts the emitted SPIR-V tests the wave mask at the current lane's bit (mask & lane_bit) rather than with a whole-word non-zero test. Fails against the previous IsNotZero64(mask) path, which zeroed complement wave-mask idioms (S_ORN2/S_NOT, e.g. Unity's NaN killer) across every lane.