The extended PALETTE.DAT format can now carry a trailing byte, called
'lognumalphatables'. If it is present, the engine assumes that alpha blending
tables are loaded at blend indices 1 to 1<<lognumalphatables and handles
rotatesprite's alpha and spriteext[].alpha accordingly.
The ability to save this new byte is added to engine.lua:savePaletteDat()
and the corresponding convenience functions in shadexfog.lua.
Examples test/screentext.con and test/sprite_access.con are updated for
demonstration purposes.
git-svn-id: https://svn.eduke32.com/eduke32@4426 1a8010ca-5511-0410-912e-c29ae57300e0
It must be a power of two in [2 .. 128]. Rewrite test/sprite_access.con's
liztroop example to account for that.
Also, add function shadexfog.create_trans() which aceepts a function
(r,g,b,R,G,B) -> blended (r,g,b) and rewrite shadexfog.create_additive_trans()
in terms of it.
git-svn-id: https://svn.eduke32.com/eduke32@4333 1a8010ca-5511-0410-912e-c29ae57300e0
See lunatic/test/sprite_access.con for a LIZTROOP that periodically smoothly
alpha-fades in and out. (Assuming that the 128 alpha blending tables from
shadexfog.create_128_trans(1) are installed.)
BUILD_LUNATIC.
git-svn-id: https://svn.eduke32.com/eduke32@4313 1a8010ca-5511-0410-912e-c29ae57300e0
