Method for reducing transport delay in a synchronous image generator

• US 6,801,205 B2
• Filed: 12/06/2000
• Issued: 10/05/2004
• Est. Priority Date: 12/06/2000
• Status: Expired due to Term

• Current Assignee: Rockwell Collins Simulation and Training Solutions, LLC
• Original Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Inventors: Hadfield, Steve O., Gardiner, Harold Dee
• Primary Examiner(s): Bella, Matthew C.
• Assistant Examiner(s): Singh, Dalip K.
• Application Number:
  US09/731,683
• Publication Number:
  US 20020109697A1
• Time in Patent Office: 1,399 Days
• Field of Search: 345/422, 345/441, 345/539, 345/55, 345/532, 345/545, 345/672, 345/572, 345/84, 345/522, 345/505, 345/531, 345/502, 345/427, 345/553, 345/419, 345/8, 345/421, 345/503, 345/547, 345/544, 345/473, 348/443, 365/230.01, 706/27, 702/150
• US Class Current: 345/539
• CPC Class Codes: G09G 5/399 using two or more bit-mapped memories, the operations of which are switched in time, e.g. ping-pong buffers

Abstract

A method for enabling reduced transport display in a computer image generator connected to a host simulator which receives real-time input. The first step is performing real-time matrices calculations with the real-time input. The next step is processing geometry for primitives in a scene and storing the primitives in a double-buffered geometry buffer. The geometry buffer toggles as soon as the geometry processing is done without waiting for a field sync signal which reduces the transport delay normally found in image generation systems. Another step is rendering the primitives into a pixel frame buffer as soon as the geometry buffer toggles. The final step is displaying the pixel frame buffer. The rendering hardware and geometry processing hardware can also include enough processing power to complete the geometric transformations and rendering and in less than one display frame. Allowing the geometry and rendering to complete faster allows reduces the transport delay because the geometry buffer can toggle sooner and the pixels can be displayed sooner.

Claims

1. A method for enabling reduced transport display in a computer image generator connected to a host simulator which receives real-time input, comprising the steps of:

(a) performing real-time matrices calculations with the real-time input;

(b) processing geometry for primitives in a scene and storing the primitives in a double-buffered geometry buffer, wherein the geometry buffer toggles immediately upon completion of the geometry processing and rendering of the last frame;

(c) rendering the primitives into a pixel frame buffer after the geometry buffer toggles; and

(d) displaying the pixel frame buffer.

2. A method as in claim 1, wherein step (b) further comprises the step of toggling the geometry buffer without waiting for a field sync.

3. A method as in claim 1, wherein step (b) further comprises the step of toggling the geometry buffer without waiting for the display period to expire.

4. A method as in claim 1, wherein step (b) further comprises the step of toggling the geometry buffer without using a field timer.

5. A method as in claim 1, wherein step (b) further comprises the step of using enough geometry processing hardware to complete the geometry processing in less than one display frame.

6. A method as in claim 1, wherein step (b) further comprises the step of using enough rendering processing hardware to complete the rendering processing in less than one display frame.

7. A method as in claim 1, wherein step (b) further comprises the step of using enough real-time processing hardware to complete the real-time processing in less than one display frame.

8. A method as in claim 1, further comprising the step of using a double buffered pixel frame buffer.

9. A method for enabling reduced transport display in a computer image generator, comprising the steps of:

(a) receiving real-time input from a simulation host computer to perform real-time matrices calculations;

(b) processing geometry for primitives in a scene and storing the primitives in a double-buffered geometry buffer, wherein the geometry buffer toggles immediately upon completion of the geometry processing without waiting for a field sync signal;

(c) rendering the primitives into pixel frame buffer by using enough rendering hardware to complete the rendering in less than one display frame, wherein the rendering begins immediately after the geometry buffer toggles; and

(d) displaying the pixel frame buffer.

10. A method as in claim 9, wherein step (b) further comprises the step of toggling the geometry buffer without waiting for the display period to expire.

11. A method as in claim 10, wherein step (b) further comprises the step of toggling the geometry buffer without using a field timer.

12. A method as in claim 9, wherein step (b) further comprises the step using enough geometry processing hardware to complete the geometry processing in less than one display frame.

13. A method as in claim 9, wherein step (b) further comprises the step using enough real-time processing hardware to complete the real-time processing in less than one display frame.

14. A method as in claim 9, wherein step (b) further comprises the step of using enough rendering processing hardware to complete the rendering processing in less than one display frame.

15. A method as in claim 9, further comprising the step of using a double buffered pixel frame buffer.

16. A method for enabling reduced transport display in a computer image generator, comprising the steps of:

(a) receiving real-time input from a simulation host computer to perform real-time matrices calculations;

(b) processing geometry for primitives in a scene and storing the primitives in a double-buffered geometry buffer, wherein the geometry buffer toggles immediately upon completion of geometry processing without waiting for a field timer to expire;

(c) rendering the primitives into a double buffered pixel frame buffer by using enough rendering hardware to complete the rendering in less than one display frame, wherein the rendering begins after the geometry buffer toggles;

(d) displaying a pixel frame buffer; and

(e) reducing the time between receiving the real-time input and displaying the pixel frame buffer based on the reduced time required to complete the real-time, geometry, and rendering processing.

17. A method as in claim 16, wherein step (e) further comprises the step of reducing the transport delay by reducing the transport time between receiving a real-time signal from the host computer and a time when the display frame is displayed.

18. A method for enabling reduced transport display in a computer image generator connected to a host simulator which receives real-time input, comprising the steps of:

(a) performing real-time matrices calculations with the real-time input;

(b) processing geometry for primitives in a scene and storing the primitives in a double-buffered geometry buffer, wherein the geometry buffer toggles before a field sync is triggered;

(c) rendering the primitives into a pixel frame buffer after the geometry buffer toggles; and

(d) displaying the pixel frame buffer.

19. A method as in claim 18, wherein step (b) further comprises the step of toggling the geometry buffer before the display period expires.

20. A method as in claim 18, wherein step (b) further comprises the step of toggling the geometry buffer without using a field timer.