[compiz] (no subject)

[David Reveman]

On Tue, 2006-12-05 at 02:52 +0100, Thierry Reding wrote:
> Hi,
> 
> I've been trying to get the new i915tex DRI module to work with the new DRM
> memory manager and finally succeeded. Unfortunately it seems to break compiz
> which errors out complaining that there are no GLXFBConfigs for the default
> depth.
> 
> I was able to trace the problem to the following block of code in
> src/screen.c, starting on line 1897:
> 
> 	if (s->fbo)
> 	{
> 		(*s->getFBConfigAttrib) (dpy,
> 			fbConfigs[j],
> 			GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
> 			&value);
> 
> 		if (value < mipmap)
> 			continue;
> 
> 		mipmap = value;
> 	}
> 
> From what I understand the contents of the if block where never executed when
> running with the i915 DRI module because it didn't support FBOs. The problem
> with the new i915tex module is that FBOs are supported, but the call to
> getFBConfigAttrib seems to always return -1 in value, resulting in the
> GLXFBConfig being discarded.
> 
> My question is if the issue at hand is a bug in the DRI driver, or whether
> compiz should be able to cope with such situations and continue as if no FBO
> support was detected in the first place.

Bug in driver. The driver is only allowed to return values GL_TRUE or
GL_FALSE for GLX_BIND_TO_MIPMAP_TEXTURE_EXT.

-David