From: Nick Bowler <nbowler@draconx.ca>
Date: Sat, 12 Mar 2022 21:11:02 +0000 (-0500)
Subject: Only redraw changed tiles when right clicking.
X-Git-Url: http://git.draconx.ca/gitweb/rrace.git/commitdiff_plain/23aee3322744aa3c65de28c3ebe1509e291b8702?ds=sidebyside;hp=23aee3322744aa3c65de28c3ebe1509e291b8702

Only redraw changed tiles when right clicking.

By changing the definition of game_check_goal to return a bit-mask
of mismatched positions, we can just pass that to the redraw mask to
reduce the amount of rendering needed.
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