[Mesa-dev] [PATCH 4/4] virgl: work around bad assumptions in virglrenderer

[Erik Faye-Lund]

On Tue, 2018-12-11 at 15:26 +0100, Erik Faye-Lund wrote:
> Virglrenderer does the wrong thing when given an instance divisor;
> it tries to use the element-index rather than the binding-index as
> the argument to glVertexBindingDivisor(). This worked fine as long
> as there was a 1:1 relationship between elements and bindings,
> which was the case util 19a91841c34 "st/mesa: Use Array._DrawVAO in
> st_atom_array.c.".
> 
> So let's detect instance divisors, and restore a 1:1 relationship in
> that case. This will make old versions of virglrenderer behave
> correctly. For newer versions, we can consider making a better
> interface, where the instance divisor isn't specified per element,
> but rather per binding. But let's save that for another day.
> 
> Signed-off-by: Erik Faye-Lund <erik.faye-lund at collabora.com>

I suppose this should have had:

Fixes: 19a91841c34 "st/mesa: Use Array._DrawVAO in st_atom_array.c."