Method and apparatus for rendering pixel information from blended texture maps

• US 6,043,821 A
• Filed: 06/30/1997
• Issued: 03/28/2000
• Est. Priority Date: 06/30/1997
• Status: Expired due to Term

• Current Assignee: ATI Technologies ULC (Advanced Micro Devices, Inc.)
• Original Assignee: ATI Technologies Incorporated (Advanced Micro Devices, Inc.)
• Inventors: Sprague, Mark A., Fuller, Richard J.
• Primary Examiner(s): Powell, Mark R.
• Assistant Examiner(s): HARRISON, CHANTE E
• Application Number:
  US08/885,679
• Time in Patent Office: 1,002 Days
• Field of Search: 345/430, 345/113, 345/523, 382/308
• US Class Current: 345/582
• CPC Class Codes: G06T 15/503 Blending, e.g. for anti-aliasing

Abstract

A method and apparatus for rendering pixel information from blended texture information is accomplished by generating first texture information and second texture information for a given pixel location. Having generated this information, the first and second texture information is blended, based on a blending function, to produce blended texture information. The blended texture information is then used to render the pixel information at the given pixel location. This process continues for each pixel location of an object element of an object, image, and/or scene.

Claims

1. A method for rendering pixel information for a given pixel location, the method comprising the steps of:

a) retrieving first texture information from at least a portion of a first texture map of a first image and second texture information from at least a portion of a second texture map of a second image for the given pixel location;

b) blending the first and second texture information based on a blending function to produce blended texture information; and

c) rendering the pixel information from the blended texture information.

2. The method of claim 1 further comprises:

receiving vertex parameters which include primary and secondary texture parameters; and

determining the first and second texture information based on the primary and secondary texture parameters.

3. The method of claim 1 further comprises determining the given pixel location based on x and y parameters of vertex parameters.

4. The method of claim 1 further comprises, within step (b), utilizing, as the blending function, a function of (first texture information) *x+(second texture information)*(1-x), where x is at least one of:

a constant, a variable, and a function.

5. The method of claim 1 further comprises utilizing at least one of:

color, pattern, highlights, reflections, clouding, separate object, and shading as the first texture information.

6. The method of claim 1 further comprises utilizing at least one of:

color, pattern, highlights, reflections, clouding, separate object, and shading as the second texture information.

7. The method of claim 1 further comprises repeating steps (a) through (c) for another pixel location of an object element.

8. A method for rendering pixel information for a given pixel location of an object element, the method comprising the steps of:

a) retrieving a plurality of texels from at least two different texture maps of at least two different images for the given pixel location;

b) blending the plurality of texels based on a blending function to produce a blended texel; and

c) rendering the pixel information from the blended texel.

9. The method of claim 8 further comprises:

receiving vertex parameters which include a plurality of texture parameters; and

determining the plurality of texels based on the plurality of texture parameters.

10. The method of claim 8 further comprises, within step (b), utilizing, as the blending function, a function of:

Σ

(texel_i) *x_i where Σ

x_i =1 and where x is at least one of;

a constant, a variable, and a function.

11. The method of claim 8 further comprises repeating steps (a) through (c) for another pixel location of the object element.

12. A method for morphing at least two images, at a given pixel location, to produce pixel information, the method comprising the steps of:

a) retrieving first texture information for a first image of the at least two images and second texture information for a second image of the at least two images based on the given pixel location, wherein the first image is stored within at least a portion of a first texture map and the second image is stored within at least a portion of a second texture map;

b) blending the first and second texture information based on a blending function to produce blended texture information; and

c) rendering the pixel information from the blended texture information.

13. The method of claim 12 further comprises:

receiving vertex parameters which include first and second image texture parameters; and

determining the first and second texture information based on the first and second image texture parameters.

14. The method of claim 12 further comprises, within step (b), utilizing, as the blending function, a function of:

(first texture information) *x+(second texture information)*(1-x), where x is at least one of;

a constant, a variable, and a function.

15. The method of claim 12 further comprises repeating steps (a) through (c) for another pixel location of the at least two images.

16. A video graphic processor comprising:

a processing device; and

memory operably coupled to the processing device, wherein the memory stores programming instructions that, when read by the processing device, causes the processing device to (a) retrieve first texture information from at least a portion of a first texture map of a first image and second texture information from at least a portion of a second texture map of a second image for the given pixel location;

(b) blend the first and second texture information based on a blending function to produce blended texture information; and

(c) render pixel information from the blended texture information.

17. A video graphic processor comprising:

a processing device; and

memory operably coupled to the processing device, wherein the memory stores programming instructions that, when read by the processing device, causes the processing device to (a) retrieve a plurality of texels from at least two different texture maps of at least two different images for the given pixel location;

(b) blend the plurality of texels based on a blending function to produce a blended texel; and

(c) render pixel information from the blended texel.

18. A video graphic processor comprising:

a processing device; and

memory operably coupled to the processing device, wherein the memory stores programming instructions that, when read by the processing device, causes the processing device to (a) retrieve first texture information for a first image of at least two images and second texture information for a second image of at least two images based on given pixel location, wherein the first image is stored within at least a portion of a first texture map and the second image is stored within at least a portion of a second texture map;

(b) blend the first and second texture information based on a blending function to produce blended texture information; and

(c) render pixel information from the blended texture information.