Extended precision visual system

• US 6,760,036 B2
• Filed: 06/27/2001
• Issued: 07/06/2004
• Est. Priority Date: 06/27/2001
• Status: Expired due to Term

• Current Assignee: Rockwell Collins Simulation and Training Solutions, LLC (Rtx Corporation)
• Original Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Inventors: Tidwell, Reed P.
• Primary Examiner(s): Bella, Matthew C.
• Assistant Examiner(s): CASCHERA, ANTONIO A
• Application Number:
  US09/892,592
• Publication Number:
  US 20030011615A1
• Time in Patent Office: 1,105 Days
• Field of Search: 345/600, 345/605, 345/690, 345/426, 345/428, 345/589, 348/384.1, 348/390.1, 348/391.1, 348/488, 708/497, 708/551
• US Class Current: 345/600
• CPC Class Codes: G06T 15/005 General purpose rendering architectures

Abstract

A method for extending the data width of a graphics processing channel in a computer graphics system. The method includes the first step of providing a plurality of graphics processing channels having pre-defined output data widths or capacities. The next step is combining at least a portion of an output from at least two of the plurality of graphics processing channels. Another step is defining at least one extended graphics processing channel with an extended data width. The extended graphics processing channel is formed with output portions from the plurality of graphics processing channels.

Claims

1. A method for extending data width of a graphics processing channel in a computer graphics system, comprising the steps of:

(a) providing a plurality of graphics processing channels having pre-defined output widths;

(b) combining at least a portion of an output from at least two of the plurality of graphics processing channels;

(c) defining at least one extended graphics processing channel with an extended data width, which is formed with output portions from the plurality of graphics processing channels, with an intensity step size within a graphics processing channel'"'"'s dynamic range that remains constant; and

(d) insuring that the intensity step size is always smaller than the intensity gradient when the intensity step size is larger than the minimum intensity step size.

2. A method as in claim 1, wherein step (c) further comprises the step of producing an extended data width that exceeds the data width of any individual pre-defined graphics processing channel.

3. A method as in claim 1, wherein step (a) further comprises the step of providing a plurality of graphics processing channels that have a hardware-defined data width.

4. A method as in claim 1, further comprising the step of combining a portion of a first hardware-defined graphics processing channel and a portion of a second hardware-defined graphics processing channel to produce a virtual channel with extended data width.

5. A method as in claim 4, further comprising the step of increasing the extended data width for the virtual channel.

6. A method as in claim 5, further comprising the step of increasing the extended data width for the at least one virtual channel by increasing a number of bits of precision available to define a viewable dynamic range.

7. A method as defined in claim 1, further comprising the step of using a graphics processing channel with extended data width for monochromatic viewable output.

8. A method for expanding the data width of a graphics processing channel, comprising the steps of:

(a) providing a plurality of graphics processing channels, each having a defined data width;

(b) combining the output of at least two graphics processing channels to create at least one extended precision channel having an increased data width that exceeds an output data width of any individual graphics processing channel;

(c) increasing the data width of the extended precision channel while keeping the intensity step size smaller than an intensity gradient.

9. A method for increasing the data width of a graphics system for rendering polygons having polygon vertices and intensities associated with the polygon vertices, further comprising the step of:

(a) providing a plurality of graphics channels having defined channel data widths;

(b) dividing the intensities of each polygon vertex into a base and an offset;

(c) creating at least one extended data width graphics channel by processing the base and offset through separate graphics channels;

(d) combining the results of the processing of the base and offset to produce an extended data width output for the polygons; and

(e) using the offset to represent the amount that each vertex varies in intensity from the base.

10. A method as in claim 9, further comprising the step of interpolating only the offset between the vertices of the polygon.

11. A method as in claim 9, further comprising the step of representing the offset as a floating-point number.

12. A method as in claim 9, further comprising the step of representing the base as a floating-point number.

13. The method as in claim 9, further comprising the step of combining the processed results of the base and offset after said base and offset are retrieved from a frame buffer, to produce an extended data width output for the polygons.

14. The method as in claim 9, further comprising the step of adding the results of the base and offset after a frame buffer.

15. A method for increasing a data width of a graphics system having a plurality of graphics channels for rendering polygons, further comprising the step of:

(a) dividing polygon vertex intensities into a base and offset;

(b) increasing a dynamic range by allowing base values to be specified at the vertices;

(c) processing the base and offset through separate graphics channels;

(d) combining the results of the base and offset processing to produce an extended data width output for the polygons; and

(e) insuring that an intensity step size is always smaller than the intensity gradient when the intensity step size is larger than the minimum intensity step size.

16. The method as in claim 15, further comprising the step of combining the results of the base and offset after the base and offset have been retrieved from a frame buffer, to produce an extended data width output for the polygons.

17. A method of increasing a dynamic range of a graphic system for rendering polygons, further comprising the step of:

(a) providing a plurality of graphics channels;

(b) restricting the dynamic range for separate polygons to a subset of the graphic system'"'"'s entire dynamic range;

(c) increasing the dynamic range of the plurality of graphic channels by using a base and offset to represent the restricted dynamic range for separate polygons; and

(d) using the offset to represent the amount that each polygon vertex varies in intensity from the base.

18. A method as in claim 17, further comprising the steps of:

dividing polygon vertex intensities into a base and an offset;

reducing the number of effective graphics processing channels by processing the base and offset through at least two graphics channels to define an extended data width channel; and

adding up the results of the base and offset for output to a display.

19. A method of increasing a dynamic range of a graphics system for rendering polygons, further comprising the steps of:

(a) providing a plurality of graphics channels;

(b) increasing the dynamic range of the graphic channels by restricting the intensity vales of separate polygons to a subset of the graphics system'"'"'s dynamic range;

(c) dividing each polygon vertex intensity into a base and an offset;

(d) creating an extended precision channel by processing the base and offset through separate red, green, blue and alpha (RGBA) graphics channels to define an extended data width channel;

(e) using the offset to represent the amount that each vertex varies in intensity from the base.

20. A method as in claim 19, further comprising the step of adding up the results of the base and offset for output to a video display.

21. The method as in claim 19, further comprising the step of insuring that an intensity step size is always smaller than the intensity gradient when the intensity step size is larger than the minimum intensity step size.

22. A method for extending the data width of a graphics processing channel, comprising the steps of:

(a) providing a plurality of graphics processing channels that are hardware defined as 8-bit channels;

(b) combining output from at least two graphics processing channels;

(c) creating at least one extended data width channel having an increased output that provides at least 12-bits of data width output while keeping the intensity step size smaller than an intensity gradient.

23. A method as in claim 22, further comprising the step of creating the at least one extended data width channel that has a data width that is selected from the group consisting of 12-bits, 16-bits, 20-bits, 24-bits, 32-bits and 64-bits.

24. A method as in claim 22, further comprising the step of combining a portion of a first 8-bit graphics processing channel and a portion of a second 8-bit graphics processing channel to produce the extended channel with extended data width.