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[d3d12] fix size of buffer (#7310)

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The buffer size was being aligned to `D3D12_CONSTANT_BUFFER_DATA_PLACEMENT_ALIGNMENT` (256). The buffer size value is used as the binding size (when none is specified), causing `arrayLength()` to return values larger than what users of the API specified for the buffer size.
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Teodor Tanasoaia 2025-03-10 17:05:50 +01:00 committed by GitHub
parent 0386211b75
commit 9021d93b9f
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1 changed files with 8 additions and 7 deletions
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15
wgpu-hal/src/dx12/device.rs
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@ -402,16 +402,17 @@ impl crate::Device for super::Device {
&self,
desc: &crate::BufferDescriptor,
) -> Result<super::Buffer, crate::DeviceError> {
let mut size = desc.size;
if desc.usage.contains(wgt::BufferUses::UNIFORM) {
let align_mask = Direct3D12::D3D12_CONSTANT_BUFFER_DATA_PLACEMENT_ALIGNMENT as u64 - 1;
size = ((size - 1) | align_mask) + 1;
}
let alloc_size = if desc.usage.contains(wgt::BufferUses::UNIFORM) {
desc.size
.next_multiple_of(Direct3D12::D3D12_CONSTANT_BUFFER_DATA_PLACEMENT_ALIGNMENT.into())
} else {
desc.size
};
let raw_desc = Direct3D12::D3D12_RESOURCE_DESC {
Dimension: Direct3D12::D3D12_RESOURCE_DIMENSION_BUFFER,
Alignment: 0,
Width: size,
Width: alloc_size,
Height: 1,
DepthOrArraySize: 1,
MipLevels: 1,
@ -436,7 +437,7 @@ impl crate::Device for super::Device {
Ok(super::Buffer {
resource,
size,
size: desc.size,
allocation,
})
}