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Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <!4902>

u_transfer_helper already had code to handle treating packed Z32_S8
as separate Z32_FLOAT and S8_UINT resources, since some drivers can't
handle that interleaved format natively.

Other hardware needs depth and stencil as separate resources for all
formats.  For example, V3D3 needs this for 24-bit depth as well.

This patch adds a new flag to lower all depth/stencils formats, and
implements support for Z24_UNORM_S8_UINT.  (S8_UINT_Z24_UNORM is left
as an exercise to the reader, preferably someone who has access to a
machine that uses that format.)
Reviewed-by: Eric Anholt <eric@anholt.net>

Add a new helper that drivers can use to emulate various things that
need special handling in particular in transfer_map:

 1) z32_s8x24.. gl/gallium treats this as a single buffer with depth
    and stencil interleaved but hardware frequently treats this as
    separate z32 and s8 buffers.  Special pack/unpack handling is
    needed in transfer_map/unmap to pack/unpack the exposed buffer

 2) fake RGTC.. GPUs designed with GLES in mind, but which can other-
    wise do GL3, if native RGTC is not supported it can be emulated
    by converting to uncompressed internally, but needs pack/unpack
    in transfer_map/unmap

 3) MSAA resolves in the transfer_map() case

v2: add MSAA resolve based on Eric's "gallium: Add helpers for MSAA
    resolves in pipe_transfer_map()/unmap()." patch; avoid wrapping
    pipe_resource, to make it possible for drivers to use both this
    and threaded_context.
Signed-off-by: Rob Clark <robdclark@gmail.com>