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nir/lower_clip: replace bogus comment about gl_ClipDistance reading in GL 

gl_ClipDistance most definitely can be read in fragment shaders since
GLSL 1.30. This is also accessible in ES with EXT_clip_cull_distance.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13917>
This commit is contained in:
Ilia Mirkin 2021-11-21 03:18:25 -05:00 committed by Marge Bot
parent b5848b2dac
commit a8930e6302
1 changed files with 3 additions and 3 deletions
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6
src/compiler/nir/nir_lower_clip.c
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@ -491,9 +491,9 @@ nir_lower_clip_fs(nir_shader *shader, unsigned ucp_enables,
if (!ucp_enables)
return false;
/* Fragment shaders can't read gl_ClipDistance[] in OpenGL so it will not
* have the variable defined, but Vulkan allows this, in which case the
* SPIR-V compiler would have already added it as a compact array.
/* No hard reason to require use_clipdist_arr to work with
* frag-shader-based gl_ClipDistance, except that the only user that does
* not enable this does not support GL 3.0 (or EXT_clip_cull_distance).
*/
if (!fs_has_clip_dist_input_var(shader, in, &ucp_enables))
create_clipdist_vars(shader, in, ucp_enables, false, use_clipdist_array);