Fix yet another culling bug

TODO.txt

@@ -1,6 +1,7 @@
 =========== GENERAL ==============
 
 - FPS logging for optim
+- try to add distance fog?
 - use 332 in SDL with potato?
 - option to turn on simple 332 colors?
 - c99 may impose limit 4095 chars on str literal, gives warning on internal

data

@@ -1,2 +1,63 @@
-"#MAAA;4321 0 "
-":*&31 :^&11"
+#Maaaaa;4321 0
+:*217I
+
+overall structure
+
+:=000 :f53a
+:x111 :f424
+:x116 :f323
+
+:)115L :)315J :)125L- :)325J- :x215 :f121               start door
+:-031 :fa19 :<031 :fa11 :<039I :fa11 :<621I- :f411      start roof
+:A&0hI| :f171 :v&7h| :^Z7hI :f211 :^@6hJ- :xZ1h :m371   big gate
+
+:=500 :fA16 :f51k
+:=D01 :fp16
+:=X07 :f41f
+:=X0u :f51q
+:=00y :f51p
+:=00W :fW14
+:=U0T :f414
+
+:^a05- :ft11
+
+:^X1l :f411 :^Y1uI :f311   jump ramps
+
+bottom section
+:=a05 :fu21 :^a25I :fu11 :'v03J :f112 :'s15L :'t15J
+:,q242- :;q233 :-n03 :f812 :mh53
+
+:;41ZJ :fR21   long wall top
+:;91WL :fJ21   long wall top bottom
+:xr1V :fa37
+
+top section
+
+:\w1ZL :f131 :\x1YI| :f131L
+:nw4Y1L :f121
+:;w1&J :f421 :f151
+:=w3Z2 :^w3@2I- :^w4@2 :=w4&2
+:=w0Y :f514
+:AA0&L :f131 :AB0@L :f131 :AA1@J :f121 :\B1ZJ :f121
+:=w0Y :f141 :m664
+
+small house top
+
+:-J3Y :f411 :~L1Y1 :<J3ZI :f411 :,K1Z2J :f211
+:=M1Z2 :f121 :=J0Y1 :m443 :=I0X2 :=J0Y3
+
+:x514 :f426
+
+bowl
+:'60rJ :f117 :^70rL- :f117 :^71rJ :f117 :|72rJ- :f117
+:|82rL :f117 :|81rL- :f117 :'50rL :f117 :m437
+
+details
+
+:;y031J :f311 :;y021L :f311   hole
+
+:^3212L :^3112L- :-2212 :-2112-   arrow
+
+:=410 :f222
+:]X1uL :f118
+:]&1uJ :f118x\

media/manual.txt

@@ -246,6 +246,9 @@ A few tips for making maps:
 
 ~~~~~ COMPILING AND MODIFYING ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+Mods are highly recommended to be distributed as diff files that will apply
+changes to the source code. This is inspired by suckless programs.
+
 TODO
 
 ~~~~~ FAQ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

renderer.h

@@ -579,11 +579,10 @@ int _LCR_rendererQuadCoversTri(const S3L_Unit quad[8], const S3L_Unit tri[6])
             quad[(2 * (j + k)) % 8 + 1],
             tri[2 * i],
             tri[2 * i + 1]);
-
         winds |= (w > 0) | ((w < 0) << 1);
       }
 
-      if (winds != 3) // no opposite winds?
+      if (winds != 3 && winds != 0) // no opposite winds and at least 1 non-0?
       {
         covered = 1;
         break;