New subject: [Bug 54736] MojoShader HLSL requires ternary operators

27 Mar 2023


      https://bugs.winehq.org/show_bug.cgi?id=54736
Bug ID: 54736
           Summary: MojoShader HLSL requires ternary operators
           Product: vkd3d
           Version: 1.7
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: hlsl
          Assignee: wine-bugs@winehq.org
          Reporter: flibitijibibo@gmail.com
      Distribution: ---
A quick note before the report: Many thanks to the vkd3d team for their work on
the HLSL compiler, we have been using it as our Linux-native HLSL compiler for
FNA and as of 1.7 we have commercial games running with it! The FNA community
is very grateful for this work.
In testing games against the latest compiler, we found that one notable
hlsl_fixme was ternary operators:
https://gitlab.winehq.org/wine/vkd3d/-/blob/57d92a15cf93d9448f2deb91a8614f9c...
MojoShader, our method for converting D3D9-era DXBC to other shader formats,
uses ternaries in a number of ways:
- cnd/cmp operations
- rsq/rcp operations (have to handle the division-by-zero case)
- Translating SV_IsFrontFace to an equivalent VFACE value
This can be tested with the Linux-native version of Terraria on Steam, using
the following process:
1. Download Terraria from the Steam client
2. Download https://fna.flibitijibibo.com/archive/fnalibs.tar.bz2, copy
lib64/libFNA3D.so.0 into Terraria's lib64 folder
3. Copy the following libraries into Terraria's lib64 folder:
- libdxvk_d3d11.so
- libdxvk_dxgi.so
- libvkd3d.so.1
- libvkd3d-shader.so.1
- libvkd3d-utils.so.1
As of writing, DXVK currently requires the latest development builds:
https://github.com/doitsujin/dxvk/actions/workflows/artifacts.yml?query=bran...
3. Run Terraria with /gldevice:D3D11 as a launch argument
With the vanilla binaries, you should be able to see the title screen and main
menu! However, the in-game screen will be mostly black, since compiling the
shaders with ternaries will fail. (Setting a breakpoint on hlsl_fixme is the
easiest way to catch the issue.)
When we intentionally break MojoShader to avoid ternaries, the game appears to
be okay, ignoring the whole "shader output is obviously incorrect" part:
https://twitter.com/flibitijibibo/status/1640136828433883139
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[Bug 54736] New: MojoShader HLSL requires ternary operators