From a90b74baaa94b3e38e2af670fd183458633481de Mon Sep 17 00:00:00 2001
From: Giovanni Mascellani <gmascellani@codeweavers.com>
Date: Mon, 12 May 2025 15:17:45 +0200
Subject: [PATCH] vkd3d-shader/dxil: Validate that floating-point truncation
 casts decrease bit width.

Similarly to the integer case.
---
 libs/vkd3d-shader/dxil.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/vkd3d-shader/dxil.c b/libs/vkd3d-shader/dxil.c
index 592754ea1..ca150831d 100644
--- a/libs/vkd3d-shader/dxil.c
+++ b/libs/vkd3d-shader/dxil.c
@@ -6877,7 +6877,7 @@ static enum vkd3d_shader_opcode sm6_map_cast_op(uint64_t code, const struct sm6_
         case CAST_FPTRUNC:
             /* TODO: native 16-bit */
             op = (from->u.width == 64) ? VKD3DSIH_DTOF : VKD3DSIH_NOP;
-            is_valid = from_fp && to_fp;
+            is_valid = from_fp && to_fp && to->u.width <= from->u.width;
             break;
         case CAST_FPEXT:
             /* TODO: native 16-bit */