1. One or more instances of computer-readable media collectively having contents configured to cause a computing system to perform a method for generating a GPU-specific command buffer representing a set of graphics commands, the method comprising: accessing a first command buffer comprising an array of fixed-length records each corresponding to a different graphics command of the set, each record of the first command buffer expressing the graphics command to which it corresponds in a manner that is not adapted to requirements of any particular GPU type; and generating from the first command buffer a second command buffer comprising an array of fixed-length records each corresponding to different graphics command of the set, each record of the second command buffer expressing the graphics command to which it corresponds in a manner that is adapted to requirements of a specific GPU type.