From f8724d459c05c04c172057a54781663aaf96e9b2 Mon Sep 17 00:00:00 2001
From: swfly <swfly@outlook.com>
Date: Mon, 2 Dec 2024 10:43:10 +0800
Subject: [PATCH] fallback: tex3d update

---
 src/backends/fallback/fallback_texture.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/backends/fallback/fallback_texture.cpp b/src/backends/fallback/fallback_texture.cpp
index e64328180..cd4b053e3 100644
--- a/src/backends/fallback/fallback_texture.cpp
+++ b/src/backends/fallback/fallback_texture.cpp
@@ -196,6 +196,7 @@ FallbackTexture::FallbackTexture(PixelStorage storage, uint dim, uint3 size, uin
         auto size_pixels = _mip_offsets[levels - 1u] + s.x * s.y;
         _data = luisa::allocate_with_allocator<std::byte>(static_cast<size_t>(size_pixels) << _pixel_stride_shift);
     } else {
+		_pixel_stride_shift = std::bit_width(static_cast<uint>(pixel_storage_size(storage, make_uint3(1u)))) - 1u;
         _size[0] = size.x;
         _size[1] = size.y;
         _size[2] = size.z;