Variable-width differential memory compression
A method, in one embodiment, can include performing difference transformation of image samples. In addition, the method can also include performing length selection. Furthermore; the method can include performing packing that includes utilizing varying sized bit fields to produce a compressed representation.
1. A method comprising:
a graphics processor performing difference transformation of image samples;
said graphics processor performing length selection; and
said graphics processor performing packing that comprises utilizing varying sized bit fields to produce a compression representation that comprises a first and second compressed representations, said first compressed representation is packed with its bit fields descending from a first end of said compression representation and said second compressed representation is packed with its bit fields ascending from a second end of said compression representation.
2. The method of claim 1 , wherein said performing packing comprises using a lowest channel size.
3. The method of claim 1 , further comprising:
said graphics processor performing channel decorrelation of image color channels.
4. The method of claim 1 , wherein said performing length selection comprising determining raw length of each difference of said performing difference transformation of image samples.
5. The method of claim 1 , wherein said performing length selection comprising determining maximum lengths of differences for a pair of samples.
6. The method of claim 1 , wherein said performing length selection comprising determining total size of differences and lengths in a channel using lengths by pairs.
7. The method of claim 1 , wherein said performing length selection comprising determining total size of all differences and lengths in a channel using a maximum length.
8. A system comprising:
a graphics processor;
a frame buffer coupled to said graphics processor;
said graphics processor for performing a method comprising:
performing difference transformation of image samples;
performing length selection; and
performing packing that comprises utilizing varying sized bit fields to produce a compression representation that comprises a first and second compressed representations, said first compressed representation is packed with its bit fields descending from a first end of said compression representation and said second compressed representation is packed with its bit fields ascending from a second end of said compression representation.
9. The system of claim 8 , wherein said method further comprising:
performing a success check of a portion of an image.
10. The system of claim 8 , wherein said image samples were compressed before said performing difference transformation.
11. The system of claim 8 , wherein said performing length selection further comprises length index encoding.
12. The system of claim 8 , wherein said performing length selection further comprises performing alpha uniform encoding.
13. The system of claim 8 , wherein said performing packing further comprises encoding a fast-clear.
14. The system of claim 8 , wherein said image samples include data selected from a group consisting of color, depth, and stencil.
15. A method comprising:
a graphics processor performing difference transformation of image samples;
said graphics processor performing length selection which comprises performing length encoding; and
said graphics processor performing packing that comprises utilizing varying sized bit fields to produce a compression representation that comprises a first and second compressed representations, said first compressed representation is packed with its bit fields descending from a first end of said compression representation and said second compressed representation is packed with its bit fields ascending from a second end of said compression representation.
16. The method of claim 15 , wherein said performing packing further comprises using a bit field to describe an anchor sample's packing.
17. The method of claim 15 , further comprising:
said graphics processor performing channel decorrelation of image color channels.
18. The method of claim 17 , wherein said performing length selection further comprises using a single maximum length for just red and blue channels.
19. The method of claim 15 , wherein said performing length selection further comprises using a single maximum length for just red, green, and blue channels.
20. The method of claim 15 , wherein said performing packing further comprises a field to describe which fixed length set to use.