Mipmap with Mixed Texture Types

• US 20200134880A1
• Filed: 09/26/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: META Platforms Technologies LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Original Assignee: Facebook Technologies, LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Inventors: Seiler, Larry, Nankervis, Alexander, Johnston, John Adrian Arthur
• Granted Patent: US 10,964,088 B2
• Time in Patent Office: Days
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: G06T 11/203 Drawing of straight lines or curves
• CPC Class Codes: G06T 11/60 Editing figures and text; Combining figures or text
• CPC Class Codes: G06T 15/04 Texture mapping
• CPC Class Codes: G06T 15/50 Lighting effects
• CPC Class Codes: G06T 3/4007 based on interpolation, e.g. bilinear interpolation image demosaicing G06T3/4015; edge-driven or edge-based scaling G06T3/403
• CPC Class Codes: G06T 7/90 Determination of colour characteristics

Abstract

In one embodiment, a method for computing a color value for a sampling pixel region includes using a computing system to determine a sampling pixel region within a texture. The texture is associated with mipmap levels having different resolutions of the texture. The mipmap levels include at least a first mipmap level defined by color texels and a second mipmap level defined by distance-field texels. The system may select one of the mipmap levels based on a size of the sampling pixel region and a size of a texel in the selected mipmap level. The system may then compute a color value for the sampling pixel region using the selected mipmap level.

Claims

1. A method comprising, by a computing system:

determining a sampling pixel region within a texture, wherein the texture is associated with mipmap levels having different resolutions of the texture, wherein the mipmap levels include at least a first mipmap level defined by color texels and a second mipmap level defined by distance-field texels;

selecting one of the mipmap levels based on a size of the sampling pixel region and a size of a texel in the selected mipmap level; and

computing a color value for the sampling pixel region using the selected mipmap level.

2. The method of claim 1, further comprising:

determining that the selected mipmap level is defined by color texels; and

selecting a first rendering logic configured to process color texels;

wherein the color value is computed using the selected first rendering logic.

3. The method of claim 2, further comprising:

determining a second sampling pixel region within the texture;

selecting, from the mipmap levels, the second mipmap level defined by distance-field texels based on a size of the second sampling pixel region and a size of each of the distance-field texels in the second mipmap level;

selecting a second rendering logic configured to process distance-field texels; and

computing a second color value for the second sampling pixel region using the selected second rendering logic and the second mipmap level.

4. The method of claim 1, wherein the selected mipmap level is selected based on a ratio between the size of the sampling pixel region and the size of each texel in the selected mipmap level.

5. The method of claim 1, wherein the first mipmap level defined by color texels has a lower resolution than the second mipmap level defined by distance-field texels.

6. The method of claim 1, wherein the first mipmap level defined by color texels has a lowest resolution in the mipmap levels and the second mipmap level defined by distance-field texels has a highest resolution in the mipmap levels.

7. The method of claim 1, wherein segments of two edges appearing in the first mipmap level are separated by less than two of the color texels.

8. The method of claim 1, further comprising:

generating the mipmap levels using the texture.

9. A system comprising:

one or more processors; and

one or more computer-readable non-transitory storage media coupled to one or more of the processors and comprising instructions operable when executed by one or more of the processors to cause the system to;

determine a sampling pixel region within a texture, wherein the texture is associated with mipmap levels having different resolutions of the texture, wherein the mipmap levels include at least a first mipmap level defined by color texels and a second mipmap level defined by distance- field texels;

select one of the mipmap levels based on a size of the sampling pixel region and a size of a texel in the selected mipmap level; and

compute a color value for the sampling pixel region using the selected mipmap level.

10. The system of claim 9, wherein the processors are further operable when executing the instructions to:

determine that the selected mipmap level is defined by color texels; and

select a first rendering logic configured to process color texels;

wherein the color value is computed using the selected first rendering logic.

11. The system of claim 10, wherein the processors are further operable when executing the instructions to:

determine a second sampling pixel region within the texture;

select, from the mipmap levels, the second mipmap level defined by distance-field texels based on a size of the second sampling pixel region and a size of each of the distance-field texels in the second mipmap level;

select a second rendering logic configured to process distance-field texels; and

compute a second color value for the second sampling pixel region using the selected second rendering logic and the second mipmap level.

12. The system of claim 9, wherein the selected mipmap level is selected based on a ratio between the size of the sampling pixel region and the size of each texel in the selected mipmap level.

13. The system of claim 9, wherein the first mipmap level defined by color texels has a lower resolution than the second mipmap level defined by distance-field texels.

14. The system of claim 9, wherein the first mipmap level defined by color texels has a lowest resolution in the mipmap levels and the second mipmap level defined by distance-field texels has a highest resolution in the mipmap levels.

15. One or more computer-readable non-transitory storage media embodying software that is operable when executed to:

determine a sampling pixel region within a texture, wherein the texture is associated with mipmap levels having different resolutions of the texture, wherein the mipmap levels include at least a first mipmap level defined by color texels and a second mipmap level defined by distance- field texels;

select one of the mipmap levels based on a size of the sampling pixel region and a size of a texel in the selected mipmap level; and

compute a color value for the sampling pixel region using the selected mipmap level.

16. The media of claim 15, wherein the processors are further operable when executing the instructions to:

determine that the selected mipmap level is defined by color texels; and

select a first rendering logic configured to process color texels;

wherein the color value is computed using the selected first rendering logic.

17. The media of claim 16, wherein the processors are further operable when executing the instructions to:

determine a second sampling pixel region within the texture;

select, from the mipmap levels, the second mipmap level defined by distance-field texels based on a size of the second sampling pixel region and a size of each of the distance-field texels in the second mipmap level;

select a second rendering logic configured to process distance-field texels; and

compute a second color value for the second sampling pixel region using the selected second rendering logic and the second mipmap level.

18. The media of claim 15, wherein the selected mipmap level is selected based on a ratio between the size of the sampling pixel region and the size of each texel in the selected mipmap level.

19. The media of claim 15, wherein the first mipmap level defined by color texels has a lower resolution than the second mipmap level defined by distance-field texels.

20. The media of claim 15, wherein the first mipmap level defined by color texels has a lowest resolution in the mipmap levels and the second mipmap level defined by distance-field texels has a highest resolution in the mipmap levels.