Vertex Pulling

• Normal vertex-streaming does not support per-face data.
• Pulling from a vertex-stream or SSBO/UBO is generally the same speed.
• Vertex-shaders only have to emit a NDC-position; how they do so is undefined.
• Vertices can be defined via vertex- and index-array within a vertex-shader.

Implementation

• Upload tightly-packed vertices to a GPU-side buffer, accessible by a vertex shader.
• Pull vertices from that buffer in the vertex-shader, based on the current vertex ID / gl_VertexID.

References

• Vertex Formats Part 2: Fetch vs Pull (recommended)
• Programmable Vertex Pulling by hannomalie
• Programmable Vertex Pulling by ktstephano
• Dynamic Vertex Pulling with D3D11
• WebGL Pulling Vertices
  Note: Uses textures instead of buffers.
• nlguillemot/ProgrammablePulling
• superdump/bevy-vertex-pulling