[Mesa-stable] [PATCH] radv: fix centroid interpolation

[Juan A. Suarez Romero]

On Tue, 2018-05-22 at 12:25 +0200, Samuel Pitoiset wrote:
> 
> On 05/22/2018 12:21 PM, Juan A. Suarez Romero wrote:
> > On Mon, 2018-05-21 at 18:32 +0200, Samuel Pitoiset wrote:
> > > Do you need a backport?
> > > 
> > 
> > What Mark means is that in 18.0, we have two implementations for
> > prepare_interp_optimize():
> 
> Two implementations? That seems quite weird. I will look into it.
> 

Right, sorry, my fault. I left an spurious file in my working tree.


The implementation is in src/amd/common/ac_nir_to_llvm.c, so I guess the code
must be removed from this file.


	J.A.

> > 
> > - one in src/amd/vulkan/radv_nir_to_llvm.c
> > - another in src/amd/common/ac_nir_to_llvm.c
> > 
> > The former already does not contain the code this patch is removing, but the
> > later one does contain it.
> > 
> > Do we need to remove it also from the later one? Otherwise, the patch is not
> > required for 18.0.
> > 
> > 
> > 	J.A.
> > 
> > 
> > 
> > > On 05/21/2018 06:30 PM, Mark Janes wrote:
> > > > Samuel Pitoiset <samuel.pitoiset at gmail.com> writes:
> > > > 
> > > > > It's legal to set the centroid and sample interpolation modes
> > > > > when MSAA disabled. So, we have to initialize the centroid
> > > > > inputs because the hardware doesn't.
> > > > > 
> > > > > This fixes rendering issues with DXVK and The Witness, World of
> > > > > Warcraft, Trackmania and probably more games.
> > > > > 
> > > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106315
> > > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102390
> > > > > CC: 18.0 18.1 <mesa-stable at lists.freedesktop.org>
> > > > > Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> > > > > ---
> > > > >    src/amd/vulkan/radv_nir_to_llvm.c | 3 ---
> > > > >    1 file changed, 3 deletions(-)
> > > > > 
> > > > > diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
> > > > > index 9b9619b877e..2d91ded7fe5 100644
> > > > > --- a/src/amd/vulkan/radv_nir_to_llvm.c
> > > > > +++ b/src/amd/vulkan/radv_nir_to_llvm.c
> > > > > @@ -2075,9 +2075,6 @@ static void
> > > > >    prepare_interp_optimize(struct radv_shader_context *ctx,
> > > > >                            struct nir_shader *nir)
> > > > >    {
> > > > > -	if (!ctx->options->key.fs.multisample)
> > > > > -		return;
> > > > > -
> > > > 
> > > > Mesa 18.0 is CC'd on this patch, but the hunk is not in that branch.
> > > > 
> > > > >    	bool uses_center = false;
> > > > >    	bool uses_centroid = false;
> > > > >    	nir_foreach_variable(variable, &nir->inputs) {
> > > > > -- 
> > > > > 2.17.0
> > > > > 
> > > > > _______________________________________________
> > > > > mesa-stable mailing list
> > > > > mesa-stable at lists.freedesktop.org
> > > > > https://lists.freedesktop.org/mailman/listinfo/mesa-stable
> > > 
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> 
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