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a358722f71
The assumption that sampler registers never have a swizzle is not
totally correct.
For instance, for the following shader:
Texture2D tex;
sampler sam;
float4 main() : sv_target
{
return tex.GatherGreen(sam, float2(0, 0));
}
the gather instruction is being disassembled as
gather4_indexable(texture2d) o0.xyzw, l(0.0, 0.0, 0.0, 0.0), t0.xyzw, s0
instead of
gather4_indexable(texture2d)(float,float,float,float) o0.xyzw, l(0.0, 0.0, 0.0, 0.0), t0.xyzw, s0.y
(notice the missing swizzle in the last parameter s0).
This is because the Gather instructions give the sampler register a vec4
dimension (and scalar swizzle type) to indicate the channel for the
gather operation.
The solution is using the new vkd3d_shader_register.dimension instead of
checking the swizzle type.