ID3D11DeviceContext::DrawInstanced method (d3d11.h)
Draw non-indexed, instanced primitives.
void DrawInstanced( [in] UINT VertexCountPerInstance, [in] UINT InstanceCount, [in] UINT StartVertexLocation, [in] UINT StartInstanceLocation );
Number of vertices to draw.
Number of instances to draw.
Index of the first vertex.
A value added to each index before reading per-instance data from a vertex buffer.
A draw API submits work to the rendering pipeline.
Instancing may extend performance by reusing the same geometry to draw multiple objects in a scene. One example of instancing could be to draw the same object with different positions and colors.
The vertex data for an instanced draw call normally comes from a vertex buffer that is bound to the pipeline. However, you could also provide the vertex data from a shader that has instanced data identified with a system-value semantic (SV_InstanceID).