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r2740 | helixhorned | 2012-06-05 15:21:26 -0700 (Tue, 05 Jun 2012) | 1 line

engine.c: cleanup / readability tweaks
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r2739 | helixhorned | 2012-06-05 15:21:22 -0700 (Tue, 05 Jun 2012) | 6 lines

TROR/classic: fix a certain class of underdraw glitches.

Those were happening when wall drawing in an upper/lower layer "closed" too
much of the "curtain" (umost/dmost) for subsequent drawing in that portal.
Example: looking down the sewer manhole at the beginning of Retaliation will
now render without HOM.
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