Pixel Shader questions

[Ivan Gyurdiev]

H. Verbeet wrote:
> On 09/04/06, Ivan Gyurdiev <ivg2 at cornell.edu> wrote:
>   
>> 1)  The following pixel shader opcodes appear to be implemented with
>> fragment_ARB, yet they are marked REQUIRE_GLSL.
>> This generates errors, and they are skipped. Is this intentional?
>>
>> D3DSIO_TEX (texld), D3DSIO_CND, D3DSIO_CMP.
>>     
> I'm not sure why they were disabled in the first place, but they can
> probably be used, yes. However, before doing that it should be
> verified the opcodes are equivalent.
>   
They're not equivalent - they're implemented [ in wined3d ] as 
combinations of other opcodes (and the cmp one is wrong).
However, this appears to be dead code at the moment - see after the GLSL 
check.

>> I want to figure out why HL2 doesn't work - enabling the codes above
>> does not seem to help (but looking at the generated shader output, it
>> makes make more sense). HL2 has severe texturing, lighting, and sound
>> problems with hardware shaders (and it's slow and unusable with the
>> software ones).
>>     
> There are currently several things broken with shaders, but I doubt
> they are the cause for sound problems.
>   
What's broken with shaders? Are there known problems, or bugs that 
haven't been found yet?