Display subsystem architecture for binding device independent drivers together into a bound driver for controlling a particular display device

• US 5,491,813 A
• Filed: 11/18/1994
• Issued: 02/13/1996
• Est. Priority Date: 02/12/1990
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Verburg, Richard L., Bondy, Gregory L., Cook, John A.
• Primary Examiner(s): Treat, William M.
• Assistant Examiner(s): Ellis, Richard L.
• Application Number:
  US08/341,858
• Time in Patent Office: 452 Days
• Field of Search: 395/500, 395/162, 395/163
• US Class Current: 719/323
• CPC Class Codes: G06F 13/102 where the programme performs an interfacing function, e.g. device driver G06F13/105 takes precedence; scheduling within device drivers G06F9/52; contention policies within device drivers G06F9/4881
• CPC Class Codes: G06F 9/44521 Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading

Abstract

A programming interface is provided in a computer graphics system which allows plural hardware display adapters to be upgraded and enhanced without correspondingly upgrading and rewriting display specific device driver code for each separate program application using the graphics system. A resource library with a standard programming interface, but specific to each display adapter is included, as well as display driver code for each adapter. Functions necessary to service the graphics model embodied in the program application are configured as device driver models and also are included within the interface of the present invention. Initially, the functions provided in the resource library are dynamically bound to expose the functionality of the desired display adapter. A second level of dynamic binding is implemented to bind the program application with the display specific code and graphic models being utilized. In this manner, numerous combinations of program applications and display adapters can be used without providing an interface for each possible combination.

Claims

1. A computer graphics system including an interface between a plurality of program applications and a plurality of dissimilar hardware display adapters, each having specific functions, comprising:

means for storing a library of resource functions including a plurality of device drivers, each device driver not corresponding to any specific individual device, but each including multiple device driver functions to control and implement different functions specific to each of said dissimilar hardware display adapters;

a plurality of device interfaces corresponding to specific functions provided by said program applications;

first means for binding specific ones of said plurality of device drivers together with one another to form a first set of bound device drivers, said first set corresponding to a first one of said dissimilar hardware display adapters, for use by a first of said program applications;

second means for binding a first one of said device interfaces, corresponding to said first dissimilar hardware display adapter, with said first set of bound device drivers and said first program application;

means for dynamically binding other specific ones of said device drivers together with one another to form a second set of bound device drivers, and a second one of said plurality of device interfaces when a second one of said dissimilar hardware display adapters is to be written to by a second one of said program applications;

means for transferring information from any one of said program applications to any one of said dissimilar hardware display adapters when a corresponding plurality of device drivers are bound with a corresponding one of said plurality of device interfaces; and

wherein said plurality of device drivers and said plurality of device interfaces are configurable to allow transfer of information from one of said program applications to any of said dissimilar hardware display adapters.

2. A system according to claim 1 wherein said second means comprises means for linking said resource functions with said device interfaces.

3. A system according to claim 1 wherein subsequent binding will provide an interface between a combination of said at least one program application and another of said hardware display adapters.

4. A system according to claim 3 further comprising a graphics package, corresponding to each of said at least of program application, containing models of graphical functions relating to said corresponding program application.

5. A system according to claim 4 wherein said graphics package, said device interface and said library of resource functions are dynamically bound.

6. A system according the claim 5 wherein said resource function comprises monitor data, group data, window data, window geometry data, cursor data, color map data, font data, model data and adapter data.

7. A system according to claim 6 wherein said dynamically bound graphics package, said device interface and said library of resource functions are configured as a single hardware display adapter interface.

8. A system according to claim 7 wherein said program application and said graphics packages determine which of said device interfaces are available for use with specific ones of said plurality of hardware display adapters.

9. A system according to claim 5 wherein said graphics package is capable of simultaneously communicating with each of said hardware display adapters.

10. A system according to claim 9 wherein said graphics package is dynamically bound to a plurality of said device interfaces.

11. A computer implemented method of interfacing between a plurality of program applications running on a computer graphics system and a plurality of dissimilar hardware display adapters contained in said system, each said adapter having specific functions, said computer implemented method comprising the steps of:

providing a library of resource functions including a plurality of device drivers, each device driver not corresponding to any specific individual device, but each having multiple device driver functions to control and implement different functions specific to each of said dissimilar hardware display adapters;

providing a plurality of device interfaces corresponding to specific functions provided by said program applications;

binding specific ones of said plurality of device drivers together with one another to form a first set, corresponding to a first one of the dissimilar hardware display adapters, for use by a first of said program applications;

binding a first one of said device interfaces, corresponding to said first hardware display adapter, with said bound first set of device drivers and said first program application;

dynamically binding other specific ones of said device drivers together with one another to form a second set, and a second one of said plurality of device interfaces when a second one of said dissimilar hardware display adapters is to be written to by a second one of said program applications;

transferring information from any one of said program applications to any one of said dissimilar hardware display adapters when a corresponding plurality of device drivers are bound with a corresponding one of said plurality of device interfaces; and

wherein said plurality of device drivers and said plurality of device interfaces are configurable to allow said transfer of information from one of said program applications to any of said dissimilar hardware display adapters.

12. A method according to claim 11 wherein said step of binding said device interfaces comprises the step of linking said resource functions with said device interfaces.

13. A method according to claim 11 further comprising the step of performing subsequent binding to provide an interface between a combination of said at least one program application and another of said hardware display adapters.

14. A method according to claim 13 further comprising the step of providing a graphics package, corresponding to each of said at least one program application, containing models of graphical functions relating to said corresponding program application.

15. A method according to claim 14 further comprising the step of dynamically binding said graphics package, said device interface and said library of resource functions.

16. A method according the claim 15 wherein said step of providing a library of resource function comprises the steps of providing monitor data, group data, window data, window geometry data, cursor data, color map data, font data, model data and adapter data.

17. A method according to claim 16 wherein said step of dynamically binding configures said graphics package, said device interface and said library of resource functions as a single hardware display adapter interface.

18. A method according to claim 17 further comprising the step of determining, by one of said program application and said graphics packages which of said device interfaces are available for use with specific ones of said plurality of hardware display adapters.

19. A method according to claim 15 wherein said step of dynamically binding comprises the step of providing simultaneous communication between said graphics package and each of said hardware display adapters.

20. A method according to claim 19 wherein said step of dynamically binding comprises the step of providing dynamic binding between said graphics package and a plurality of said device interfaces.