Multiply blend mode doesn't work on DX11 render backend

[gleblebedev]

Fails with the error:

Works fine on opengl.

Sample material:

  <material>
	  <technique name="Techniques/DiffMultiply.xml" />
	  <texture unit="diffuse" name="FPS3/Particles/Smoke/Smoke_v1/Source/Smoke_v1.dds" />
	  <parameter name="MatDiffColor" value="1 1 1 1" />
  <parameter name="MatEmissiveColor" value="0 0 0" />
	  <parameter name="UOffset" value="1 0 0 0" />
	  <parameter name="VOffset" value="0 1 0 0" />
	  <shader psdefines="PACKEDNORMAL" />
  </material>

[github-actions]

Marking this stale since there has been no activity for 30 days.
It will be closed if there is no activity for another 15 days.

[SuperWangKai]

These are the parameters Urho uses when multiple blend mode is applied and triggers the issue-

By enabling the DX11 Debug Layer, we can get this error output-

D3D11 ERROR: ID3D11Device::CreateBlendState: SrcBlendAlpha[ 0 ] is trying to use a D3D11_BLEND value (0x9) that manipulates color, which is invalid. [ STATE_CREATION ERROR #215: CREATEBLENDSTATE_INVALIDSRCBLENDALPHA]

According to D3D11 Spec , it seems (Section 17.2) only these values are valid for SrcBlendAlpha -

D3D11_BLEND_ZERO
D3D11_BLEND_ONE
D3D11_BLEND_SRC_ALPHA
D3D11_BLEND_INV_SRC_ALPHA
D3D11_BLEND_DEST_ALPHA
D3D11_BLEND_INV_DEST_ALPHA
D3D11_BLEND_SRC_ALPHA_SAT
D3D11_BLEND_BLEND_FACTOR
D3D11_BLEND_INV_BLEND_FACTOR
D3D11_BLEND_SRC1_ALPHA
D3D11_BLEND_INV_SRC1_ALPHA

[PencilAmazing]

Maybe engine should log an error saying so if blend state creation fails?