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Bug
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    Resolution: Done
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P2: Important
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    6.1, 6.2
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    None
 
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        347310eb21facbd03d2168d67d83fdbfd6f6888c (qt/qtbase/dev) 4aae624836871c315d81078c5ae78b082a26bd49 (qt/qtbase/6.1)
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        Qt Quick 3D - 2021 Week 21/22
 
Not having any inputs in a vertex shader is perfectly valid, as is exercised by Quick 3D particles now. With D3D11 creating an input layout object with 0 elements leads to a STATE_CREATION WARNING #420 debug layer warning, when enabled (i.e. when running with QSG_RHI_DEBUG_LAYER=1). This should be handled in QRhi's D3D11 backend by skipping the input layout object creation as appropriate, and rather calling IASetInputLayout with nullptr if there are no inputs.