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Instanced vertex buffers

Both OpenGL ES and Vulkan have support for instanced drawing. Instanced drawing uses attribute instance divisors to divide a buffer to locate the data for each instance. There are some hardware limitations which determine the optimal usage of instanced vertex buffers.

Prerequisites

You must understand the following concepts:

  • Instance divisors.
  • Instanced vertex buffers.

How to optimize the use of vertex buffers

Try using the following optimization steps:

  • Use a single interleaved vertex buffer for all instance data.
  • Use instanced attributes to work around limitation of 16KB uniform buffers.
  • Use a number of vertices per instance that are a power-of-two.
  • Prefer indexed lookups using gl_InstanceID into uniform buffers or shader storage buffers. Rather than per-instance attribute data.

Instanced vertex buffer steps to avoid

Do not use more than one instanced vertex buffer per draw call.

The negative impacts of an inefficient instanced vertex buffer

If the vertex buffer is not properly optimized, then you can expect a reduced performance on all impacted instanced draw calls.