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r3212 | helixhorned | 2012-11-18 11:01:39 -0800 (Sun, 18 Nov 2012) | 3 lines

build.lua: provide simplistic "readdefs()", use in foreachmap.lua.

So that symbolic tile names can be used when searching maps.
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r3211 | helixhorned | 2012-11-18 11:01:34 -0800 (Sun, 18 Nov 2012) | 16 lines

Remove many redundant (int16_t) casts and one now incorrect one.

The redundant ones are in code like this: s->cstat = (int16_t)32768;
Because the value is eventually converted to the type of "s->cstat", any
casts to integral types having at least as many bits are no-ops, signedness
being irrelevant due to (probably any two's complement arch targeting
compiler's) bit-pattern preserving semantics of these conversions.

The now incorrect one is: if (lotag == (int16_t) 65535),
"int32_t lotag" being read from a wall or sprite struct directly earlier.
Now, with these members being unsigned, and (int16_t)65535 equalling -1,
the check always fails.  The correction fixes normal switches having such
a lotag ending the level immediately.

In short: integer casts before assignments are unnecessary, those in reads
highly relevant!
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r3210 | helixhorned | 2012-11-18 11:01:29 -0800 (Sun, 18 Nov 2012) | 8 lines

Correct arithmetic comparisons of lo/hitags in actors.c.

Rewriting them in the obvious way, i.e. by casting the expression
to int16_t first.  (That is, this commit is the reverse of r3174,
but with casts applied.)  This fixes at least one regression: a
FIREEXT with a hitag of 0 should not be linked with same-
(that is, zero-) tagged SEENINEs or OOZFILTERs.
Mind the corner cases!
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