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nir: Add nir_lower_viewport_transform

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On Mali hardware (supported by Panfrost and Lima), the fixed-function
transformation from world-space to screen-space coordinates is done in
the vertex shader prior to writing out the gl_Position varying, rather
than in dedicated hardware. This commit adds a shared NIR pass for
implementing coordinate transformation and lowering gl_Position writes
into screen-space gl_Position writes.

v2: Run directly on derefs before io/vars are lowered to cleanup the
code substantially. Thank you to Qiang for this suggestion!

v3: Bikeshed continues.

v4: Add to Makefile.sources (per Jason's comment). Bikeshed comment.

Ian and Qiang's reviews are from v3, but no real functional changes from
v4. Rob's review is from v4.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Suggested-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Alyssa Rosenzweig
2019-04-14 15:43:13 +00:00
parent 89b02bffcb
commit 2ce4adefa5
4 changed files with 105 additions and 0 deletions
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1
src/compiler/nir/meson.build
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@@ -152,6 +152,7 @@ files_libnir = files(
'nir_lower_vars_to_ssa.c',
'nir_lower_var_copies.c',
'nir_lower_vec_to_movs.c',
'nir_lower_viewport_transform.c',
'nir_lower_wpos_center.c',
'nir_lower_wpos_ytransform.c',
'nir_lower_bit_size.c',