a render pass handle.
the number of indices to draw per instance.
the number of instances to draw.
the starting index within the index buffer.
value added to vertex index before indexing into the vertex buffer.
the ID of the first instance to draw.
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Draws data using bound graphics state with an index buffer and instancing enabled.
You must not call this function before binding a graphics pipeline.
Note that the first_vertex and first_instance parameters are NOT compatible with built-in vertex/instance ID variables in shaders (for example, SV_VertexID); GPU APIs and shader languages do not define these built-in variables consistently, so if your shader depends on them, the only way to keep behavior consistent and portable is to always pass 0 for the correlating parameter in the draw calls.