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r4428 | helixhorned | 2014-04-09 11:51:35 -0700 (Wed, 09 Apr 2014) | 8 lines

CON: in rotatespritea and screentext, if alpha < 0, make -alpha denote blend.

For convenience, orientation gets bit 1 (translucency) set automatically.
Again, test/screentext.con is updated to show off this functionality (the
code there assumes that additive blending tables are loaded at blend
numbers 101 -- 132).

BUILD_LUNATIC.
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r4427 | helixhorned | 2014-04-09 11:51:33 -0700 (Wed, 09 Apr 2014) | 1 line

LunaCON: fix 'screentext' command.
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r4426 | helixhorned | 2014-04-09 11:51:31 -0700 (Wed, 09 Apr 2014) | 11 lines

In ext. PALETTE.DAT, store log2 of last alpha table index. Handle alpha in classic.

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.
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