Handle WGPUVertexStepMode_Undefined

stepMode defaults to "vertex". https://www.w3.org/TR/webgpu/#dom-gpuvertexbufferlayout-stepmode

Author: AlbinBernhardssonARM

src/lib.rs

@@ -2156,7 +2156,7 @@ pub unsafe extern "C" fn wgpuDeviceCreateRenderPipeline(
                     .map(|buffer| wgc::pipeline::VertexBufferLayout {
                         array_stride: buffer.arrayStride,
                         step_mode: match buffer.stepMode {
-                            native::WGPUVertexStepMode_Vertex => wgt::VertexStepMode::Vertex,
+                            native::WGPUVertexStepMode_Vertex | native::WGPUVertexStepMode_Undefined => wgt::VertexStepMode::Vertex,
                             native::WGPUVertexStepMode_Instance => wgt::VertexStepMode::Instance,
                             _ => panic!("invalid vertex step mode for vertex buffer layout"),
                         },