[Mesa-dev] RFC: ctx->Driver.Map/UnmapTextureImage() hooks

Eric Anholt eric at anholt.net
Sat Jul 23 08:14:50 PDT 2011

On Fri, 22 Jul 2011 14:06:48 -0600, Brian Paul <brianp at vmware.com> wrote:
> On 07/22/2011 01:32 PM, Eric Anholt wrote:
> > On Thu, 23 Jun 2011 19:08:51 -0600, Brian Paul<brianp at vmware.com>  wrote:
> >>
> >> I'd like to overhaul the part of Mesa related to texture memory
> >> reading/writing.
> >
> > OK, I'm taking a look at map-texture-image-v4.  I like what I'm seeing
> > overall, I just want to be sure that this isn't something that gets
> > squash-merged.  There's going to be breakage, and I want to be able to
> > bisect into it.
> >
> > In the metaops code, please use glBufferData instead of
> > glBufferSubData.  If you BufferSubData, I have to block on the GPU if it
> > was using that buffer already.
> It looks like we'd have to change that in several other places too. 
> Can we do that change later?
> > In the comments for void (*MapTextureImage), please note what the units
> > of rowStride are.  I see that's present in swrast later, but I think the
> > mtypes.h and dd.h files are used for reference a lot (I do, certainly).
> Will do.  The parameter comments in s_texture.c are out of date too.
> > c029312ad62039904818a8b1765c6bcdf50044df is huge, and it doesn't even
> > build.  Ouch.  I think there's some room for splitting some of this up
> > so that we can get a nice series.
> Where's the build breakage?  I don't remember that.
> This was originally a long series of sometimes ugly WIP patches.  At 
> one point I had a git mishap and trashed some of the intermediate 
> patches.  I agree that splitting up this commit would be good, but it 
> would be a lot of work that I don't really have time for.
> It would be great if you could do a full piglit run with the branch 
> and check for i965/i915 regressions.  I'm not aware of any with swrast 
> or gallium.  I'd help diagnose any regressions.

The piglit run was in bad shape and then hung the GPU, something that
piglit hasn't done for me in a long time.

I think I'm going to need to split up the commits to make progress.
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