New subject: [Bug 59950] Shader compilation fails when starting Just Cause.

July 1, 2026

      http://bugs.winehq.org/show_bug.cgi?id=59950

            Bug ID: 59950
           Summary: Shader compilation fails when starting Just Cause.
           Product: Wine
           Version: 11.10
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: d3d-util
          Assignee: wine-bugs@list.winehq.org
          Reporter: ldmwbjbipxjqwacdhk@kjkpc.net
      Distribution: ---

Created attachment 81324
  --> http://bugs.winehq.org/attachment.cgi?id=81324
Patch that fixes the issue

Shader compilation fails when starting Just Cause.

When I start Just Cause on Wine 11.10 or newer, I get 3 message boxes
complaining about syntax errors.

Title: Vertex shader error!
Line 40: Unexpected input e
Line 40: Error "syntax error" from bison

Title: Vertex shader error!
Line 42: Unexpected input e
Line 42: Error "syntax error" from bison

Title: Vertex shader error!
Line 48: Unexpected input e
Line 48: Error "syntax error" from bison

Here is a snippet of some interesting lines when enabling tracing with
WINEDEBUG=trace+d3dcompiler,asmshader

0024:trace:asmshader:asmshader_parse Vertex shader 1.1
0024:trace:asmshader:asmparser_constF Adding float constant 90 at pos 0.
0024:trace:asmshader:asmparser_constF Adding float constant 91 at pos 1.
0024:trace:d3dcompiler:compilation_message Line 40: Unexpected input e
0024:trace:d3dcompiler:compilation_message Line 40: Error "syntax error" from
bison
0024:trace:d3dcompiler:assemble_shader Assembler messages:
0024:trace:d3dcompiler:assemble_shader "Line 40: Unexpected input e\nLine 40:
Error \"syntax error\" from bison\n"
0024:trace:d3dcompiler:assemble_shader Shader source:
0024:trace:d3dcompiler:assemble_shader
"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\r\nvs_1_1
\r\ndef c90 , 768 , 256 , 0.5 , - 0.00138883968 \r\ndef c91 , 0.159154937 ,
0.25 , 0.5 , 0.0416666418 \r\ndef c92 , 6.28318548 , - 3.14159274 , -
2.52398507e-007 , 2.47609005e-005 \r\ndef c93 , - 0.5 , 1 , 0 , "...
0024:trace:d3dcompiler:D3DCreateBlob data_size 70, blob 0032F594.
0024:trace:d3dcompiler:D3DCreateBlob Created ID3DBlob 0558F108
0024:trace:d3dcompiler:d3dcompiler_blob_GetBufferPointer iface 0558F108
0024:err:d3dcompiler:assemble_shader Asm reading failed

This is a regression. The game starts fine on Wine 11.0, 11.5, 11.7, 11.9,
and probably older versions as well.

Suspected cause:

If I am reading the git log correctly, Wine 11.10 defaulted to builtin
Direct3D libraries, instead of using the native libraries. This revealed
a deficiency in the Direct3D shader parser. The problem seems to be that
the game uses the exponent notation for some floating-point literals,
but the Wine's parser grammar does not accept that.

Proposed solution:

A one line change to dlls/d3dcompiler_43/asmshader.l , that adds support
for the exponent notation, seems to solve the problem.

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[Bug 59950] New: Shader compilation fails when starting Just Cause.

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