Three-dimensional graphic processing device for drawing polygon having vertex data defined by relative value and method therefor

• US 20010010522A1
• Filed: 01/23/2001
• Published: 08/02/2001
• Est. Priority Date: 01/27/2000
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Moriwaki, Shohei, Azekawa, Yoshifumi, Chiba, Osamu
• Granted Patent: US 6,788,299 B2
• Time in Patent Office: Days
• US Class Current: 345/630
• CPC Class Codes: G06T 15/20 Perspective computation

Abstract

A three-dimensional graphic processing device includes an identifying portion for identifying whether the vertex data of a polygon to be drawn is an absolute value or a relative value, an operation unit for operating to obtain the absolute value of vertex data identified as a relative value by the identifying portion and a set up circuit for generating data necessary for drawing based on the absolute value of the vertex data obtained by the operation unit. The operation unit operates to obtain the absolute value of vertex data identified as a relative value by the identifying portion, and therefore the vertex data of a polygon can be expressed by a relative value. As a result, the data amount of polygon data can be reduced, which permits the drawing throughput to be improved.

Claims

1. A three-dimensional graphic processing device, comprising:

an identifying portion for identifying whether vertex data of a polygon to be drawn is an absolute value or a relative value;

an operation portion for operating to obtain an absolute value of vertex data identified as a relative value by said identifying portion; and

a generation portion for generating data necessary for drawing based on the absolute value of the vertex data obtained by said operation portion.

2. The three-dimensional graphic processing device according to

claim 1

, wherein said operation portion operates to obtain an absolute value of vertex data expressed by a relative value from vertex data expressed by an absolute value in the same polygon.

3. The three-dimensional graphic processing device according to

claim 1

, wherein said operation portion operates to obtain the absolute value of vertex data expressed by a relative value in a polygon from vertex data expressed by an absolute value in another polygon.

4. The three-dimensional graphic processing device according to

claim 1

, further comprising a storage portion for storing an absolute value of vertex data to be a starting point,

said operation portion operates to obtain an absolute value of vertex data identified as a relative value by said identifying portion based on the absolute value of vertex data to be a starting point stored in said storage portion.

5. The three-dimensional graphic processing device according to

claim 4

, wherein said storage portion stores vertex data expressed by an absolute value of a basic polygon, and

said operation portion operates to obtain an absolute value of vertex data in a polygon other than said basic polygon based on the vertex data expressed by the absolute value of the basic polygon stored in said storage portion.

6. The three-dimensional graphic processing device according to

claim 1

, wherein said vertex data is polygon coordinate data.

7. The three-dimensional graphic processing device according to

claim 1

, wherein said vertex data is texture mapping coordinate data.

8. The three-dimensional graphic processing device according to

claim 1

, wherein said vertex data is color data.

9. A three-dimensional graphic processing method, comprising the steps of:

identifying whether vertex data of a polygon to be drawn is an absolute value or a relative value;

operating to obtain an absolute value of vertex data identified as a relative value; and

generating data necessary for drawing based on said obtained absolute value of vertex data.

10. The three-dimensional graphic processing method according to

claim 9

, wherein said step of operating to obtain the absolute value of vertex data includes the step of operating to obtain an absolute value of vertex data expressed by a relative value from vertex data expressed by an absolute value in the same polygon.

11. The three-dimensional graphic method according to

claim 9

, wherein said step of operating to obtain the absolute value of vertex data includes the step of operating to obtain an absolute value of vertex data expressed by a relative value in a polygon from vertex data expressed by an absolute value in another polygon.

12. The three-dimensional graphic processing method according to

claim 9

, further comprising the step of storing an absolute value of vertex data to be a starting point,

said step of operating to obtain the absolute value of vertex data includes the step of operating to obtain an absolute value of vertex data expressed by a relative value based on the absolute value of said stored vertex data to be a starting point.

13. The three-dimensional graphic processing method according to

claim 12

, wherein said step of storing vertex data includes the step of strong vertex data expressed by an absolute value of a basic polygon, and

said step of operating to obtain the absolute value of vertex data includes the step of operating to obtain an absolute value of vertex data in a polygon other than said basic polygon based on said stored vertex data expressed by the absolute value of the basic polygon.

14. The three-dimensional graphic processing method, according to

claim 9

, wherein said vertex data is polygon coordinate data.

15. The three-dimensional graphic processing method, according to

claim 9

, wherein said vertex data is texture mapping coordinate data.

16. The three-dimensional graphic processing method, according to

claim 9

, wherein said vertex data is color data.