[Bug 40891] New: Shaders fail to compile in League of Legends

https://bugs.winehq.org/show_bug.cgi?id=40891

Bug ID: 40891
           Summary: Shaders fail to compile in League of Legends
           Product: Wine
           Version: 1.9.13
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-d3d
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 54981
  --> https://bugs.winehq.org/attachment.cgi?id=54981
Game client console output (stdout+stderr)

When going into a game, the loading screen stays black and the game crashes
after a few seconds. Using native D3D9 works around the problem.

The full console output is attached. There's a repeat of messages like the
following:
fixme:hlsl_parser:hlsl_parse Array.
fixme:d3dcompiler:make_assignment Check for casts in the lhs.
fixme:d3dcompiler:make_assignment Check for casts in the lhs.
err:d3dcompiler:compile_shader HLSL shader parsing failed.
League of Legends.exe(00000009):  ERROR| PixelShader::Load: failed to create
shader program for
<Data/Shaders/HLSL/Filters/Dilate/PS_2PASS_DILATE_FILTER_1.ps_2_0>

The following two messages are also shown for some shaders: 
fixme:hlsl_parser:declare_vars Complex initializers are not supported yet.
fixme:d3dcompiler:make_assignment LHS expression not supported in compound
assignments yet.