It is combined with slot location to identify a varying
when using VARYING_SLOT_VARx_16BIT.
Acked-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20157>
We want to be able to carry this along with the shader instead of always
having to re-generate it from scratch. A new nir_gather_xfb_info()
helper is also added which, instead of returning it, adds it to the
shader.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16750>
When varyings was added we moved to use to dynamycally allocated
pointers, instead of allocating just one block for everything. That
breaks some assumptions of some vulkan drivers (like anv), that make
serialization and copying easier. And at the same time, varyings are
not needed for vulkan.
So this commit moves them out. Although it seems a little an overkill,
fixing the anv side would require a similar, or more, changes, so in
the end it is about to decide where do we want to put our effort.
v2: (from Jason review)
* Don't use a temp variable on the _create methods, just return
result of rzalloc_size
* Wrap some lines too long.
Fixes: cf0b2ad486 ("nir/xfb: adding varyings on nir_xfb_info and gather_info")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
In order to be used for OpenGL (right now for ARB_gl_spirv).
This commit adds two new structures:
* nir_xfb_varying_info: that identifies each individual varying. For
each one, we need to know the type, buffer and xfb_offset
* nir_xfb_buffer_info: as now for each buffer, in addition to the
stride, we need to know how many varyings are assigned to it.
For this patch, the only case where num_outputs != num_varyings is
with the case of doubles, that for dvec3/4 could require more than one
output. There are more cases though (like aoa), that will be handled
on following patches.
v2: updated after new nir general XFB support introduced for "anv: Add
support for VK_EXT_transform_feedback"
v3: compute num_varyings beforehand for allocating, instead of relying
on num_outputs as approximate value (Timothy Arceri)
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Where component_offset here is the offset when accessing components of
a packed variable. Or in other words, location_frac on
nir.h. Different places of mesa use different names for it.
Technically nir_xfb_info consumer can get the same from the
component_mask, it seems somewhat forced to make it to compute it,
instead of providing it.
v2: rename local location_frac for comp_offset, more similar to the
intended use (Timothy Arceri)
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This is different from the GL_ARB_spirv pass because it generates a much
simpler data structure that isn't tied to OpenGL and mtypes.h.
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
