Validation error when building acceleration structure without index buffer

[Vecvec]

Description
When building an acceleration structure on vulkan a vulkan validation layer error is printed

Validation Error: [ VUID-vkCmdBuildAccelerationStructuresKHR-pInfos-03806 ] Object 0: handle = 0x2bae8c8dec0, type = VK_OBJECT_TYPE_COMMAND_BUFFER; | MessageID = 0x76173dcc | vkCmdBuildAccelerationStructuresKHR(): pInfos[0].pGeometries[0].geometry.tria
ngles.indexData.deviceAddress (0x0) is not an address belonging to an existing buffer. pInfos[0].pGeometries[0].geometry.triangles.indexType is VK_INDEX_TYPE_UINT16. The Vulkan spec states: For any element of pInfos[i].pGeometries or pInfos[i].ppGeometries wit
h a geometryType of VK_GEOMETRY_TYPE_TRIANGLES_KHR, if geometry.triangles.indexType is not VK_INDEX_TYPE_NONE_KHR, geometry.triangles.indexData.deviceAddress must be a valid device address obtained from vkGetBufferDeviceAddress (https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-vkCmdBuildAccelerationStructuresKHR-pInfos-03806)

this is because when calling AccelerationStructureGeometryTrianglesDataKHR::default() in

wgpu/wgpu-hal/src/vulkan/command.rs

Lines 504 to 506 in 2fac5e9

	let mut triangle_data =
	vk::AccelerationStructureGeometryTrianglesDataKHR::default()
	.vertex_data(vk::DeviceOrHostAddressConstKHR {

IndexType is set to UINT16 (because apart from when building acceleration structures NONE_KHR is not valid) therefore this needs to be set by the code.

Repro steps
Call build_acceleration_structures on a vulkan device without providing a index buffer (by setting AccelerationStructureTriangles::indices to None`)

Expected vs observed behavior
There should be no validation error but one is generated

Extra materials
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Platform
N/a

Proposed Fix

impl crate::CommandEncoder for super::CommandEncoder {
                     for triangles in in_geometries {
                         let mut triangle_data =
                             vk::AccelerationStructureGeometryTrianglesDataKHR::default()
+                                .index_type(vk::IndexType::NONE_KHR)
                                 .vertex_data(vk::DeviceOrHostAddressConstKHR {
                                     device_address: get_device_address(triangles.vertex_buffer),
                                 })