[Openchrome-users] Max Texture Size

[Thomas Hellström]

Boris Du?ek wrote:

>Hi all,
>
>the great news is that Xgl starts with this patch.
>The bad news is that compiz complains that "compiz: Support for non power of 
>two textures missing."
>The info at http://gentoo-wiki.com/HOWTO_XGL/Troubleshooting says that "The 
>driver has to support either the GL_{NV,EXT,ARB}_texture_rectangle or the 
>GL_ARB_texture_non_power_of_two extension.", which explains the problem (but 
>why does it not fallback to software rendering?).
>
>I have started poking around in the driver sources, so I will see if I find 
>some solution/workaround.
>
>Cheers,
>Boris Dusek
>
>On Monday 24 April 2006 15:40, Ivor Hewitt wrote:
>  
>
>>Anyone know if the texture size fix in:-
>>
>>https://bugs.freedesktop.org/show_bug.cgi?id=3130
>>
>>ever got committed to dri? and if not why not?
>>    
>>
Boris,

Take a look at
http://dri.freedesktop.org/wiki/ConfigurationForDevelopers

and then at the top of via_screen.c in the unichrome 3D driver sources. 
A number of options is listed there with macros that are somewhat 
explained in the driconf wiki pages.

Then install driconf and you will be able to tweak the options listed at 
the top of via_screen.c using driconf. (Quite neatly I must say), but 
hmm, wait. the options seem to never be queried by the driver.

So what it all boils down to is to add a boolean option to a suitable 
driconf section at the top of via_screen.c, which can then be queried using

driQueryOptionb(&vmesa->optionCache, "max_texsize");

And based on the return value decide to use the hack or not.

While you're at it, the unichrome dri driver have a number of options 
that are using environment variables:

 > grep -i getenv *.c

returns

via_context.c:      if (getenv("ALTERNATE_SCREEN"))
via_context.c:    if (getenv("VIA_DEBUG"))
via_context.c:       VIA_DEBUG = driParseDebugString( getenv( "VIA_DEBUG" ),
via_context.c:    if (getenv("VIA_NO_RAST"))
via_context.c:    vmesa->vblank_flags = (getenv("VIA_VSYNC") ?
via_context.c:    if (getenv("VIA_PAGEFLIP"))
via_tex.c:   if (getenv("VIA_NO_SSE"))

These should ideally also be moved to driconf option handling, which is 
only a matter of finishing what others have started.

/Thmas







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