Instanced rendering

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for this:

• behaviour for per-instance is similar to per-vertex, except:
  • data that is per-instance is bound to binding id 1 instead of 0
• if the material is instanced:
  • an additional vertex input binding is given, bound to id 1
  • additional vertex attribute bindings are given as well, at binding 1
• container of instanced data is a device memory buffer
  • its length is instance count * instance stride

getting information for what data to bind:

• most efficient is 1:1 bindings from an array
• materials with added push constants could become part of per-instance data

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another way that instanced rendering could be achieved, is by having storage buffers that get their data populated procedurally. shaders already have storage buffers exposed, and materials can also describe what components are part of per-instance data.