GLSL vector data types simplify working with vertex data

• Consider a 4-component vector vec4 v
• Access components by name or index:
  • by name v.x
  • or by index v[2] (same as v.z)
• Vectors can represent any collection of data
  • positions
  • colors
  • vector-valued data (e.g., velocity, direction, etc.)
• Vector components can be swizzled
  • repeat component values v.xxxx
  • reorder components v.zyx