The startVertex of set_transient_vertex_buffer_with_layout() ?

[cloudwu]

void setVertexBuffer(uint8_t _stream, const TransientVertexBuffer *_tvb, uint32_t _startVertex, uint32_t _numVertices, VertexLayoutHandle _layoutHandle = BGFX_INVALID_HANDLE)

https://github.com/bkaradzic/bgfx/blob/master/src/bgfx_p.h#L2560-L2563

stream.m_startVertex   = _tvb->startVertex + _startVertex;
stream.m_handle        = _tvb->handle;
stream.m_layoutHandle  = isValid(_layoutHandle) ? _layoutHandle : _tvb->layoutHandle;
m_numVertices[_stream] = bx::min(bx::uint32_imax(0, _tvb->size/_tvb->stride - _startVertex), _numVertices);

The m_startVertex of stream is calculated by _tvb->startVertex, but stream.m_layoutHandle can be _layoutHandle rather than _tvb->layoutHandle. The offset will be not correct when the stride is different. And I don't think the max number of vertices can be calculated by _tvb->size/_tvb->stride when I specify a vertex layout.

[cloudwu]

Another issue is about void bgfx::update(DynamicVertexBufferHandle _handle, uint32_t _startVertex, const Memory *_mem).
I think we should specify the VertexLayoutHandle here if the _mem contains the different vertices, so that bgfx can calculate the correct alignment of the data .