We rely on these being initialized to NULL so meta can reliably detect
whether or not they've been set. ds_state is also allowed to not be
present so we need a well-defined value for that.
This mega-commit primarily does two things. First, is to turn anv_batch
into a better abstraction of a batch. Instead of actually having a BO, it
now has a few pointers to some piece of memory that are used to add data to
the "batch". If it gets to the end, there is a function pointer that it
can call to attempt to grow the batch.
The second change is to start using chained batch buffers. When the end of
the current batch BO is reached, it automatically creates a new one and
ineserts an MI_BATCH_BUFFER_START command to chain to it. In this way, our
batch buffers are effectively infinite in length.
If a meta operation is called before the pipeline is set, this can cause
uses of undefined values. They *should* be harmless, but we might as well
shut up valgrind on this one too.
Previously, we just blasted out whatever VB's we had marked as "dirty"
regardless of which ones were used by the pipeline. Given that the stride
of the VB is embedded in the pipeline this can cause problems. One problem
is if the pipeline doesn't use the given VB binding we emit a bogus stride.
Another problem is that we weren't properly resetting the dirty bits when
the pipeline changed.
Previously, we waited until later and did a pass through the used surfaces
and did the relocations then. This lead to doing double-relocations which
was causing us to get bogus surface offsets.
Since the binding table pointer is only 16 bits, we can only have 64kb
of binding table state allocated at any given time. With a block size of
1kb, that amounts to just 64 command buffers, which is not enough.
The binding table pointers packet only allows for a 16-bit binding table
address so all binding tables have to be in the first 64 KB of the surface
state BO. We solve this by adding a slave block pool that pulls off the
first 64 KB worth of blocks and reserves them for binding tables.
We now always copy the entire struct unless pData is NULL and
unconditionally write back the struct size. It's not clear this is
useful if the structs may grow over time, but it seems to be the
expected behaviour for now.
This changes the way descriptor sets and layouts work so that we fill
out binding table contents at the time we bind descriptor sets. We
manipulate the binding table contents and sampler state in a shadow-copy
in anv_cmd_buffer. At draw time, we allocate the actual binding table
and sampler state and flush the anv_cmd_buffer copies.
This is rather crude but it at least makes sure that all the render targets
get flushed at the end of the pass. We probably actually want to do
somthing based on image layout traansitions, but this will work for now.
