Multi-output decoder for texture decompression

Patent metadata

Field	Value
Publication number	US-11568580-B2
Application number	US-202117161449-A
Country	US
Kind code	B2
Filing date	Jan 28, 2021
Priority date	Apr 28, 2017
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A decoder is configured to decode a plurality of texels from a received block of texture data encoded according to the Adaptive Scalable Texture Compression (ASTC) format, and includes a parameter decode unit configured to decode configuration data for the received block of texture data, a colour decode unit configured to decode colour endpoint data for the plurality of texels of the received block in dependence on the configuration data, a weight decode unit configured to decode interpolation weight data for each of the plurality of texels of the received block in dependence on the configuration data, and at least one interpolator unit configured to calculate a colour value for each of the plurality of texels of the received block using the interpolation weight data for that texel and a pair of colour endpoints from the colour endpoint data. At least one of the parameter decode unit, colour decode unit and weight decode unit are configured to decode intermediate data from the received block that is common to the decoding of at least a subset of texels of that block and to use that decoded intermediate data as part of the decoding of at least two of the plurality of texels from the received block of texture data.

First claim

What is claimed is:

1. A decoder configured to decode a plurality of texels from a received block of texture data encoded according to the Adaptive Scalable Texture Compression (ASTC) format, the decoder comprising:
a colour decode unit configured to decode colour endpoint data for the plurality of texels of the received block;
a weight decode unit configured to decode interpolation weight data for each of the plurality of texels of the received block; and
at least one interpolator unit configured to calculate a colour value for each of the plurality of texels of the received block using the interpolation weight data for that texel and a pair of colour endpoints from the colour endpoint data;

wherein at least one of the colour decode unit and weight decode unit are configured to: (i) decode intermediate data from the received block that is common to the decoding of at least a subset of texels of that block and independent of which of the texels are decoded from the received block; and (ii) use that decoded intermediate data as part of the decoding of at least two of the plurality of texels from the received block of texture data.

2. The decoder as claimed in claim 1 , wherein the colour decode unit is configured to decode colour endpoint data for the plurality of texels of the received block in dependence on configuration data derived for the received block.

3. The decoder as claimed in claim 1 , wherein the weight decode unit is configured to decode interpolation weight data for each of the plurality of texels of the received block in dependence on configuration data derived for the received block.

4. The decoder as claimed in claim 1 , further comprising a parameter decode unit configured to decode configuration data for the received block of texture data.

5. The decoder as claimed in claim 4 , wherein the parameter decode unit is configured to: (i) decode intermediate data from the received block that is common to the decoding of at least a subset of texels of that block and independent of which of the texels are decoded from the received block; and (ii) use that decoded intermediate data as part of the decoding of at least two of the plurality of texels from the received block of texture data.

6. The decoder as claimed in claim 1 , wherein the at least one of the colour decode unit and weight decode unit are configured to use the same decoded intermediate data as part of the decoding of each of the plurality of texels being decoded from the received block.

7. The decoder as claimed in claim 3 , wherein a first portion of the configuration data is common to the decoding of the plurality of texels from the received block, and the weight decode unit is configured to use that first portion of configuration data for decoding the interpolation weight data for each of the plurality of texels.

8. The decoder as claimed in claim 7 , wherein the first portion of configuration data comprises at least one of: a weight grid size specifying the dimensions of a weight grid; and weight ranges specifying the range of values occupied by weights of the grid.

9. The decoder as claimed in claim 2 , wherein a second portion of the configuration data is common to the decoding of the plurality of texels from the received block, and the colour decode unit is configured to use that second portion of configuration data for decoding the colour endpoint data for each of the plurality of texels.

10. The decoder as claimed in claim 4 , wherein the parameter decode unit is configured to: decode intermediate configuration data from the block as part of decoding the configuration data; and use that same intermediate configuration data to decode a partition index for each of the plurality of texels.

11. The decoder as claimed in claim 10 , wherein the intermediate configuration data comprises at least one of: a partition pattern index; and a partition number.

12. The decoder as claimed in claim 1 , wherein the colour decode unit is configured to: decode intermediate colour data from the block as part of decoding the colour endpoint data that is independent of the texels being decoded from that block; and use that intermediate colour data to decode the colour endpoint data for each of the plurality of texels.

13. The decoder as claimed in claim 12 , wherein the intermediate colour data comprises the size of the data within the block used to represent the colour endpoints.

14. The decoder as claimed in claim 1 , wherein the colour decode unit is configured to decode a set of colour values and to convert those values into a pair of colour endpoints for each of the plurality of texels, the colour decode unit being configured to use at least one of the colour endpoints for two or more of the plurality of texels.

15. The decoder as claimed in claim 14 , wherein the texels represented by the block are partitioned into n p partitions, and the colour decode unit is configured to decode a set of n v colour values and to convert those values into a pair of colour endpoints for each of the plurality of texels, each colour endpoint being formed from nog colour values, where n v <2n p n cv .

16. The decoder as claimed in claim 1 , wherein the weight decode unit is configured to: decode intermediate weight data from the block as part of decoding the interpolation weight data that is common to the decoding of the texels from the received block; and use that data to decode the interpolation weight data for each of the plurality of texels.

17. The decoder as claimed in claim 1 , wherein the texels represented by the block are partitioned into n p partitions, and the decoder comprises n p interpolators each configured to calculate a colour value for a subset of texels in a respective partition using the interpolation weight data for that texel and a respective pair of colour endpoints from the colour endpoint data.

18. The decoder as claimed in claim 1 , wherein the block of texture data represents a block of n by m texels, and the plurality of texels is a block of p by q texels, where p≤n and q≤m.

19. A method of decoding a plurality of texels from a received block of texture data encoded according to the Adaptive Scalable Texture Compression (ASTC) format, the method comprising:
decoding colour endpoint data for the plurality of texels of the received block;
decoding interpolation weight data for each of the plurality of texels of the received block; and
calculating a colour value for each of the plurality of texels of the received block using the interpolation weight data for that texel and a pair of colour endpoints from the colour endpoint data;
wherein at least one of the decoding of colour endpoint data and decoding of interpolation weight data comprises: (i) decoding intermediate data from the received block that is common to the decoding of at least a subset of the plurality of texels from that block and independent of which of the texels are decoded from the received block; and (ii) using that decoded intermediate data for the decoding of at least two of the plurality of texels from the received block of texture data.

20. An integrated circuit definition dataset that, when processed in an integrated circuit manufacturing system, configures the integrated circuit manufacturing system to manufacture a decoder configured to decode a plurality of texels from a received block of texture data encoded according to the Adaptive Scalable Texture Compression (ASTC) format, the decoder comprising:
a colour decode unit configured to decode colour endpoint data for the

Assignees

• Imagination Tech Ltd

Inventors

• Rovers Kenneth
• Foo Yoong Chert

Classifications

• H04N19/436

  using parallelised computational arrangements · CPC title

• G06T11/001 Primary

  Physics · mapped topic

• H04N19/44

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title

• G06T15/04

  Texture mapping · CPC title

• G06T9/00 Primary

  Image coding (bandwidth or redundancy reduction for static pictures H04N1/41; coding or decoding of static colour picture signals H04N1/64; methods or arrangements for coding, decoding, compressing or decompressing digital video signals H04N19/00) · CPC title