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nir: Add "viewport vector" system values

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While a partial set of viewport system values exist, these are scalar
values, which is a poor fit for viewport transformations on vector ISAs
like Midgard (where the vec3 values for scale and offset each need to be
coherent in a vec4 uniform slot to take advantage of vectorized
transform math). This patch adds vec3 scale/offset fields corresponding
to the 3D Gallium viewport / glViewport+depth

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Alyssa Rosenzweig
2019-04-03 01:45:44 +00:00
parent b85ca86c1e
commit a83862754e
1 changed files with 5 additions and 0 deletions
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5
src/compiler/nir/nir_intrinsics.py
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@@ -547,10 +547,15 @@ system_value("work_dim", 1)
# VC4 and V3D need to emit a scaled version of the position in the vertex
# shaders for binning, and having system values lets us move the math for that
# into NIR.
#
# Panfrost needs to implement all coordinate transformation in the
# vertex shader; system values allow us to share this routine in NIR.
system_value("viewport_x_scale", 1)
system_value("viewport_y_scale", 1)
system_value("viewport_z_scale", 1)
system_value("viewport_z_offset", 1)
system_value("viewport_scale", 3)
system_value("viewport_offset", 3)
# Blend constant color values. Float values are clamped.#
system_value("blend_const_color_r_float", 1)