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spirv: Support EXT_mesh_shader indices and mark them per-primitive.

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They are not defined as per-primitive in the EXT, but they behave
like per-primitive outputs so it's easier to treat them like that.
They may still require special treatment in the backend in order to
control where and how they are stored.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18366>
This commit is contained in:
Timur Kristóf 2022-01-20 16:33:27 +01:00 • committed by Marge Bot
parent c315e2e718
commit f6925b8446
1 changed files with 16 additions and 0 deletions
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16
src/compiler/spirv/vtn_variables.c
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@ -1143,6 +1143,9 @@ vtn_get_builtin_location(struct vtn_builder *b,
case SpvBuiltInPrimitiveCountNV:
*location = VARYING_SLOT_PRIMITIVE_COUNT;
break;
case SpvBuiltInPrimitivePointIndicesEXT:
case SpvBuiltInPrimitiveLineIndicesEXT:
case SpvBuiltInPrimitiveTriangleIndicesEXT:
case SpvBuiltInPrimitiveIndicesNV:
*location = VARYING_SLOT_PRIMITIVE_INDICES;
break;
@ -1236,6 +1239,19 @@ apply_var_decoration(struct vtn_builder *b,
case SpvBuiltInCullDistancePerViewNV:
var_data->compact = true;
break;
case SpvBuiltInPrimitivePointIndicesEXT:
case SpvBuiltInPrimitiveLineIndicesEXT:
case SpvBuiltInPrimitiveTriangleIndicesEXT:
/* Not defined as per-primitive in the EXT, but they behave
* like per-primitive outputs so it's easier to treat them like that.
* They may still require special treatment in the backend in order to
* control where and how they are stored.
*
* EXT_mesh_shader: write-only array of vectors indexed by the primitive index
* NV_mesh_shader: read/write flat array
*/
var_data->per_primitive = true;
break;
default:
break;
}