vkd3d-shader/ir: Transform clip/cull inputs/outputs into arrays.

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Takes care of transforming clip/cull system values from the Direct3D
convention of 2 4-component registers, into the SPIR-V/GLSL convention
of 8-element scalar float arrays.

This fixes SPIR-V validation errors in clip-cull-distance.shader_test,
as well as segfaults on Mesa 25.1.1-arch1.2 if those shaders are
executed regardless.

We create indexable temporaries of the appropriate size, and replace
accesses to clip/cull I/O signature elements with accesses to those
temporaries. The existing clip/cull signature elements are then replaced
with new scalar signature element arrays, and we copy the contents of
those I/O signature elements to/from the corresponding temporaries at
the start/end of the vsir program.

It is worth pointing out that the current implementation assumes that
every instance of the control point phase of a hull shader only writes
to the output registers of its control point, given by
vOutputControlPointID, and not to other control points. Shader
compilation will fail if that constraint is violated.

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This commit is contained in:

Francisco Casas

2025-08-22 20:08:21 -04:00

committed by Henri Verbeet

parent 85b7b9c6b4

commit 0dabfdee63

Notes: Henri Verbeet 2025-11-25 20:40:54 +01:00

Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1816

4 changed files with 775 additions and 108 deletions

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libs/vkd3d-shader/ir.c

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