Texture Compression

A computer-implemented method comprising:

• receiving a texture map;
• compressing the texture map, using a first compressor, to a first compressed representation of the texture map in a first compression format;
• generating an array of compression parameters for a second compressor, comprising determining, for each of a plurality of pixel regions of the texture map, one or more respective compression parameters which optimize compression of the pixel region into a compressed representation in a second compression format using the second compressor;
• and
• storing the first compressed representation of the texture map in association with the array of compression parameters for the second compressor.

A non-transitory computer readable storage medium storing computer program code that, when executed by a processing device, causes the processing device to perform operations comprising:

• receiving a first compressed representation of a texture map in a first compression format, wherein the first compressed representation has been compressed using a first compressor;
• receiving an array of compression parameters for a second compressor, the array of compression parameters including one or more respective compression parameters for each of a plurality of pixel regions of the texture map;
• decompressing the first compressed representation of the texture map to obtain the texture map;
• compressing, using the second compressor, the texture map to a second compressed representation in a second compression format, comprising compressing each of said plurality of pixel regions of the texture map in accordance with the respective one or more compression parameters;
• storing the second compressed representation of the texture map to one or more memories accessible by a graphics processing unit;
• selectively decompressing portions of the second compressed representation of the texture map using the graphical processing unit.

An apparatus comprising:

• at least one processor;
• and
• at least one memory including computer program code which, when executed by the at least one processor, causes the apparatus to:
• receive a texture map;
• compress the texture map, using a first compressor, to a first compressed representation of the texture map in a first compression format;
• generate an array of compression parameters for a second compressor, comprising determining, for each of a plurality of pixel regions of the texture map, one or more respective compression parameters which optimize compression of the pixel region into a compressed representation in a second compression format using the second compressor;
• and
• store the first compressed representation of the texture map in association with the array of compression parameters for the second compressor.