what's a texture indirection?

[jcabeleira]

i'm new in vertex/fragment programming and i've heard some concepts that i don't understand but i wish to, so could anyone, please, explain-me what texture indirections and dependent-reads are?

[AdrianD]

that's how i understand this:

dependent-reads:
1. read texture A
2. use values from A to lookup into texture B

texture indirections:
1. read the vertex mapping into register A
2. access texture using register A instead of using the vertex mapping directly.

btw. this only applies to fp's.(vp's don't support texture accesses)

[jcabeleira]

thanks