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vkd3d-shader/ir: Fix the addition swizzle in vsir_program_lower_precise_mad().

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The swizzle from vsir_swizzle_from_writemask() is for use with a
contiguous write mask starting at bit zero, but we need the final write
mask to match that of the original MAD instruction.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58746
This commit is contained in:
Conor McCarthy
2025-10-09 17:41:26 +10:00
committed by Henri Verbeet
parent f9d12e5596
commit 1c23976660
Notes: Henri Verbeet 2025-10-15 13:00:34 +02:00 
Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1781
2 changed files with 5 additions and 2 deletions
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5
libs/vkd3d-shader/ir.c
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@@ -1426,9 +1426,12 @@ static enum vkd3d_result vsir_program_lower_precise_mad(struct vsir_program *pro
vsir_register_init(&mul_dst->reg, VKD3DSPR_TEMP, mul_ins->src[0].reg.data_type, 1);
mul_dst->reg.dimension = add_ins->dst->reg.dimension;
mul_dst->reg.idx[0].offset = *tmp_idx;
mul_dst->write_mask = mul_dst->reg.dimension == VSIR_DIMENSION_VEC4
? VKD3DSP_WRITEMASK_ALL : VKD3DSP_WRITEMASK_0;
add_ins->src[0].reg = mul_dst->reg;
add_ins->src[0].swizzle = vsir_swizzle_from_writemask(mul_dst->write_mask);
add_ins->src[0].swizzle = mul_dst->reg.dimension == VSIR_DIMENSION_VEC4
? VKD3D_SHADER_NO_SWIZZLE : VKD3D_SHADER_SWIZZLE(X, X, X, X);
add_ins->src[0].modifiers = 0;
add_ins->src[1] = mul_ins->src[2];