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nir: Add blend_const_color_rgba sysval

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This represents a float vec4 constant color, as passed to glBlendColor.
While the existing 4 shader sysvals are retained to minimize code churn,
a single vectorized intrinsic is required for efficient blending on
vector architectures. (This may also apply to archictectures like
Bifrost where ALU is scalar but load/store is vector; it largely depends
on how blending is implemented per-driver.)

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Alyssa Rosenzweig
2019-05-06 02:00:37 +00:00
parent 6b0472b181
commit 006cafc243
1 changed files with 4 additions and 1 deletions
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5
src/compiler/nir/nir_intrinsics.py
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@@ -568,11 +568,14 @@ system_value("viewport_z_offset", 1)
system_value("viewport_scale", 3)
system_value("viewport_offset", 3)
# Blend constant color values. Float values are clamped.#
# Blend constant color values. Float values are clamped. Vectored versions are
# provided as well for driver convenience
system_value("blend_const_color_r_float", 1)
system_value("blend_const_color_g_float", 1)
system_value("blend_const_color_b_float", 1)
system_value("blend_const_color_a_float", 1)
system_value("blend_const_color_rgba", 4)
system_value("blend_const_color_rgba8888_unorm", 1)
system_value("blend_const_color_aaaa8888_unorm", 1)