The base index within the index buffer.
The ID of the first instance to draw.
The number of indices to draw per instance.
The number of instances to draw.
The value added to the vertex index before indexing into the vertex buffer.
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A structure specifying the parameters of an indexed indirect draw command.
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.