Conor McCarthy : vkd3d: Introduce a helper function to chain vkd3d structures.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 6a88c57f5d776ad4978ffad3918e4c3a75b9c332
URL:    https://source.winehq.org/git/vkd3d.git/?a=commit;h=6a88c57f5d776ad4978ffad3918e4c3a75b9c332

Author: Conor McCarthy <cmccarthy at codeweavers.com>
Date:   Fri Oct 15 01:37:44 2021 +0200

vkd3d: Introduce a helper function to chain vkd3d structures.

Analogous to vk_prepend_struct().

Signed-off-by: Conor McCarthy <cmccarthy at codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 libs/vkd3d/state.c         |  9 ++++-----
 libs/vkd3d/vkd3d_private.h | 13 +++++++++++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/libs/vkd3d/state.c b/libs/vkd3d/state.c
index 277afe4..29d8618 100644
--- a/libs/vkd3d/state.c
+++ b/libs/vkd3d/state.c
@@ -2689,12 +2689,11 @@ static HRESULT d3d12_pipeline_state_init_graphics(struct d3d12_pipeline_state *s
                 goto fail;
         }
 
-        shader_interface.next = shader_stages[i].stage == xfb_stage ? &xfb_info : NULL;
+        shader_interface.next = NULL;
+        if (shader_stages[i].stage == xfb_stage)
+            vkd3d_prepend_struct(&shader_interface, &xfb_info);
         if (target_info)
-        {
-            target_info->next = shader_interface.next;
-            shader_interface.next = target_info;
-        }
+            vkd3d_prepend_struct(&shader_interface, target_info);
 
         if (FAILED(hr = create_shader_stage(device, &graphics->stages[graphics->stage_count],
                 shader_stages[i].stage, b, &shader_interface)))
diff --git a/libs/vkd3d/vkd3d_private.h b/libs/vkd3d/vkd3d_private.h
index f8474ca..0594eea 100644
--- a/libs/vkd3d/vkd3d_private.h
+++ b/libs/vkd3d/vkd3d_private.h
@@ -1395,4 +1395,17 @@ static inline void vk_prepend_struct(void *header, void *structure)
     vk_header->pNext = vk_structure;
 }
 
+static inline void vkd3d_prepend_struct(void *header, void *structure)
+{
+    struct
+    {
+        unsigned int type;
+        const void *next;
+    } *vkd3d_header = header, *vkd3d_structure = structure;
+
+    assert(!vkd3d_structure->next);
+    vkd3d_structure->next = vkd3d_header->next;
+    vkd3d_header->next = vkd3d_structure;
+}
+
 #endif  /* __VKD3D_PRIVATE_H */