Drawing

Primitive

Select the typ of primitive to render with IASetPrimitiveTopology. The common ones are *PRIMITIVE_TOPOLOGY_POINTLIST, *PRIMITIVE_TOPOLOGY_LINELIST and PRIMITIVE_TOPOLOGY_TRIANGLELIST. Older DirecX version did take it as a parameter to each draw function.

DeviceContext::IASetPrimitiveTopology().

SetBuffers

To set the vertex buffers and index buffer to use call ID3D11DeviceContext::IASetVertexBuffers and ID3D11DeviceContext::IASetIndexBuffers

Non-indexed or Indexed

The two basic draw commands are Draw and DrawIndexed. Draw takes the number of vertices to draw and the index of the first vertex in the vertex buffer (it is also possible to not use a vertex buffer and use SV_VertexID in the shader to generate the vertex). DrawIndexed takes the number of index to drarw, the first index in the index buffers and a offset to add to each index before reading the vertex from the vertex buffer.

DeviceContext::Draw( UINT VertexCount, UINT StartVertexLocation );

DeviceContext::DrawIndexed( UINT IndexCount, UINT StartIndexLocation, INT BaseVertexLocation );

Instanced

Instanced rendering is used to draw the same geometry multiple times, example the same fence is used many times in the same area so only the transform of it is different.

DeviceContext::DrawInstanced( UINT VertexCountPerInstance, UINT InstanceCount, UINT StartVertexLocation, UINT StartInstanceLocation );

DeviceContext::DrawIndexedInstanced( UINT IndexCountPerInstance, UINT InstanceCount, UINT StartIndexLocation, INT BaseVertexLocation, UINT StartInstanceLocation);

Hardware Instancing and Frustum Culling using SlimDX and Direct3D 11 - 2013

DrawInstancedPrimitives in XNA Game Studio 4.0 - 2010

Indirect

DeviceContext::DrawInstancedIndirect

DeviceContext::DrawIndexedInstancedIndirect

• • Efficient Work Submission in Direct3D - 2014