code: func (rce RenderCommandEncoder) DrawPrimitives(typ PrimitiveType, vertexStart, vertexCount int) {
  	C.RenderCommandEncoder_DrawPrimitives(rce.commandEncoder, C.uint8_t(typ), C.uint_t(vertexStart), C.uint_t(vertexCount))
  }
docs: // DrawPrimitives renders one instance of primitives using vertex data
  // in contiguous array elements.
  //
  // Reference: https://developer.apple.com/documentation/metal/mtlrendercommandencoder/1516326-drawprimitives.