[PATCH vkd3d] vkd3d: Return the standard D3D12 resource alignment instead the Vulkan requirement.

[Conor McCarthy]

Some apps, e.g. WoW, ignore a non-standard alignment and use the expected one.

Signed-off-by: Conor McCarthy 
---
 libs/vkd3d/device.c   | 15 ++++++++++++---
 libs/vkd3d/resource.c |  6 ++++++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/libs/vkd3d/device.c b/libs/vkd3d/device.c
index a63fc92b..941e6d04 100644
--- a/libs/vkd3d/device.c
+++ b/libs/vkd3d/device.c
@@ -3221,7 +3221,7 @@ static D3D12_RESOURCE_ALLOCATION_INFO * STDMETHODCALLTYPE d3d12_device_GetResour

if (desc->Dimension == D3D12_RESOURCE_DIMENSION_BUFFER)
     {
-        info->SizeInBytes = desc->Width;
+        info->SizeInBytes = align(desc->Width, D3D12_DEFAULT_RESOURCE_PLACEMENT_ALIGNMENT);
         info->Alignment = D3D12_DEFAULT_RESOURCE_PLACEMENT_ALIGNMENT;
     }
     else
@@ -3235,9 +3235,18 @@ static D3D12_RESOURCE_ALLOCATION_INFO * STDMETHODCALLTYPE d3d12_device_GetResour
         requested_alignment = desc->Alignment
                 ? desc->Alignment : D3D12_DEFAULT_RESOURCE_PLACEMENT_ALIGNMENT;
         info->Alignment = max(info->Alignment, requested_alignment);
-    }

-    info->SizeInBytes = align(info->SizeInBytes, info->Alignment);
+        info->SizeInBytes = align(info->SizeInBytes, info->Alignment);
+
+        /* Pad by the maximum heap offset increase which may be needed to align an offset
+         * supplied by the calling application to a higher Vulkan requirement. This allows
+         * us to return the standard D3D12 alignment and adjust resource placement later. */
+        if(info->Alignment > requested_alignment)
+        {
+            info->SizeInBytes += info->Alignment - requested_alignment;
+            info->Alignment = requested_alignment;
+        }
+    }

TRACE("Size %#"PRIx64", alignment %#"PRIx64".\n", info->SizeInBytes, info->Alignment);

diff --git a/libs/vkd3d/resource.c b/libs/vkd3d/resource.c
index a9d4d464..f3ddc9cb 100644
--- a/libs/vkd3d/resource.c
+++ b/libs/vkd3d/resource.c
@@ -1901,9 +1901,15 @@ static HRESULT vkd3d_bind_heap_memory(struct d3d12_device *device,
     VkResult vr;

if (d3d12_resource_is_buffer(resource))
+    {
         VK_CALL(vkGetBufferMemoryRequirements(vk_device, resource->u.vk_buffer, &requirements));
+    }
     else
+    {
         VK_CALL(vkGetImageMemoryRequirements(vk_device, resource->u.vk_image, &requirements));
+        /* Padding in d3d12_device_GetResourceAllocationInfo() leaves room to align the offset. */
+        heap_offset = align(heap_offset, requirements.alignment);
+    }

if (heap_offset % requirements.alignment)
     {

[Henri Verbeet]

On Fri, 4 Jun 2021 at 16:30, Conor McCarthy  wrote:
> Some apps, e.g. WoW, ignore a non-standard alignment and use the expected one.

This seems like something that would benefit from a test.
> -
>    /* Pad by the maximum heap offset increase which may be needed to align an offset
> -
>     * supplied by the calling application to a higher Vulkan requirement. This allows
> -
>     * us to return the standard D3D12 alignment and adjust resource placement later. */
> -
>    if(info->Alignment > requested_alignment)
> -
>    {
> -
>        info->SizeInBytes += info->Alignment - requested_alignment;
> -
>        info->Alignment = requested_alignment;
> -
>    }

Space between "if" and "(". By convention, "d3d12".