More general-purpose stuff

[Mike F]

Lots of interesting techniques have recently surfaced that rely on encoding values into places that were never meant to hold them.

In particular:
Encoding normals into textures (bump-mapping)
Encoding normals into texcoords (dp env-mapping)
Encoding distances into the alpha-buffer (shadow-buffering)


Here's my wish-list:

1) Some general-purpose interpolators that can be used as operands for blend-func, texenv and texgen.

2) An arbitrary-precision general-purpose buffer (like an alpha-buffer but without the implied purpose)

3) More texenv functionality. Possibly something similar to EXT_texture_env_combine, but with the general-purpose interpolators available as arguments and without the clamping

4) State-objects for all this to simplify management.


Thoughts? Opinions?

Mike Ferenduros