Bug 107942

Summary:	Isaac AntiBirth under wine has invisible entities tu to clipping plane issue
Product:	Mesa	Reporter:	Fabian Maurer <dark.shadow4>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED NOTOURBUG	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	18.2
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	Traces and hacked shader

Description Fabian Maurer 2018-09-15 12:58:05 UTC

Created attachment 141571 [details]
Traces and hacked shader

The game plays fine under wine, but in a certain stage the player and enemies are invisible.
There is a semi-official hack for this problem, involving a changed shader. (See attachment):
> //gl_ClipDistance[0] = dot(gl_Vertex, ClipPlane);

Two apitraces included, with the hack and one without.

A few more things:
- Some windows machines have the same issue, but most seem to run the game just fine
- The trace I made doesn't replay fine on my win10 either (AMD driver issue or maybe wine making broken opengl calls?)

I'd test with wine and proprietary drivers on my linux, but can't get them to work.
Since I don't know what's wrong here, I hope you can help me shed a light on this - wheter it's an actual mesa issue or just a broken game.

System:
Arch Linux x64
Using mesa 18.2.0
Linux 4.18.7, amdgpu
Radeon R9 285

Comment 1 Timothy Arceri 2018-09-17 06:17:47 UTC

This is a game bug. Compilation of this (and other) shaders are failing because the game is using features of later glsl versions but its not setting the required version in the shader. When the version is not specified I believe the spec says it should default to glsl 1.10.

For example a more correct work around would be to add the following to the top of the shader:

#version 130

This should really be reported to the developer. And we should also create some CTS tests to make sure the binary drivers don't allow this behavior. This is a long standing difference where the behaviors of the binary drivers causes games to end up not working on Mesa.

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