Topic       : Pure C Library Documentation
Author      : John Kormylo
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Subject     : Documentation/Pure C Library
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View Ref-File[ Virtual Device Interface ]

The VDI provides device independent graphics functions:

  VDI Workstation - graphics device drivers
  VDI Mouse       - mouse cursor
  VDI Output      - draw graphics primitives
  VDI Attributes  - set line style, fill pattern, etc.
  VDI Inquire     - attribute information
  VDI Raster      - bit plane operations
  VDI Input       - mouse and keyboard
  VDI Escapes     - device specific operations
  GDOS            - Graphics Device Operating System

The only device drivers in ROM are for the screen.
All other devices require GDOS device drivers be loaded from disk.

The mouse cursor must NOT be active while performing VDI screen
operations (see v_hide_c and v_show_c).

VDI functions are implemented using TRAP #2 instructions.
Register D0 must contain $73 and D1 must contain a pointer to the
VDIPB structure which is used to pass the parameters.

Function vdi() can be used to implement new bindings.

See also VDI Handle, VDI Coordinates, VDI Description and VDI Extended.