Re: [PATCH v2] wined3d: Avoid using float literals for MAX_FLOAT in GLSL when possible.

[Paul Gofman]

On 4/6/19 12:06, Stefan Dösinger wrote:
> I suspect the application changed the FPU precision to single precision
> or something like that. I remember that there is (was?) some bug where
> the nvidia driver didn't parse a float literal that was not MAX_FLOAT
> correctly and the resulting loss of precision broke the shader.
>
> Other drivers parsed it correctly even with the FPU in single precision
> mode.

Yes, this is the case. Application does not even have to do that 
explicitly, x87 single precision is set in d3d9 device initialization 
without D3DCREATE_FPU_PRESERVE flag. It is strange that most (if not 
all) of the 32 bit builds are still using x87 these days. I suppose many 
of then won't run on Pentium III computer anyway.