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nir: Add intrinsics for the line width

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The first intrinsic is intended to expose the value set by glLineWidth
to shaders internally. The second intrinsic exposes the value actually
sent to the hardware. This may be wider than the first one in order to
implement anti-aliasing. These will be used in later patches to
implement a line smoothing lowering pass.

v2: Add a second intrinsic for the expanded line width for
    anti-aliasing.

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5624>
This commit is contained in:
Neil Roberts
2020-06-22 09:49:33 +02:00
committed by Marge Bot
parent 2c4616368b
commit 121b82f638
1 changed files with 2 additions and 0 deletions
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src/compiler/nir/nir_intrinsics.py
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@@ -606,6 +606,8 @@ system_value("local_group_size", 3)
system_value("global_invocation_id", 3, bit_sizes=[32, 64])
system_value("global_invocation_index", 1, bit_sizes=[32, 64])
system_value("work_dim", 1)
system_value("line_width", 1)
system_value("aa_line_width", 1)
# Driver-specific viewport scale/offset parameters.
#
# VC4 and V3D need to emit a scaled version of the position in the vertex