Nikolay Sivov : vkd3d-shader/d3dbc: Do not write semantic declarations for unused variables.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 25d353db91b99b8fc93a02a3db29ec3002825189
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/25d353db91b99b8fc93a02a3db29ec...

Author: Nikolay Sivov <nsivov(a)codeweavers.com>
Date:   Fri Mar  8 12:54:34 2024 +0100

vkd3d-shader/d3dbc: Do not write semantic declarations for unused variables.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55829
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56402
Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>

---

 libs/vkd3d-shader/d3dbc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/vkd3d-shader/d3dbc.c b/libs/vkd3d-shader/d3dbc.c
index 644f0996..57dd0258 100644
--- a/libs/vkd3d-shader/d3dbc.c
+++ b/libs/vkd3d-shader/d3dbc.c
@@ -2062,6 +2062,9 @@ static void write_sm1_semantic_dcl(struct hlsl_ctx *ctx, struct vkd3d_bytecode_b
     D3DDECLUSAGE usage;
     bool ret;
 
+    if ((!output && !var->last_read) || (output && !var->first_write))
+        return;
+
     if (hlsl_sm1_register_from_semantic(ctx, &var->semantic, output, ®.type, ®.reg))
     {
         usage = 0;