Lunatic: gv.getangle() vs. analogous Lua function test, add some anchors to doc.

Also, in listglobals.sh, check for file existence.

git-svn-id: https://svn.eduke32.com/eduke32@4044 1a8010ca-5511-0410-912e-c29ae57300e0

polymer/eduke32/source/lunatic/doc/lunatic.txt

@@ -455,6 +455,7 @@ http://lua-users.org/lists/lua-l/2011-09/msg00534.html
 * `sec.lotag=32768` results the member to contain `-32768`
 * `sec.lotag=2^32` is undefined
 
+[[bit_fields]]
 Bit fields
 ^^^^^^^^^^
 
@@ -1717,6 +1718,7 @@ specific actor tile. For this reason, per-actor variables are implemented in a
 value for every sprite index. They are also ``cleaned'' at unspecified
 intervals.
 
+[[con_actorvar]]
 ===== The type `con.actorvar(defaultval)` [_serializable_]
 
 Creates and returns a new per-actor variable with default value `defaultval`

polymer/eduke32/source/lunatic/listglobals.sh

@@ -20,6 +20,10 @@ fi
 LUAC=luac
 
 for f in "$@"; do
+    if [ ! -f "$f" ]; then
+        echo "$f: No such file"
+        exit 2
+    fi
     echo "[$f]"
     # Strip LuaJIT specific syntax first. Run luac and extract interesting lines.
     sed -r -e "s/[0-9]+U?LL/0/g" "$f" | $LUAC -p -l - | grep "${GS}ETTABUP.*; _ENV " |

polymer/eduke32/source/lunatic/test.lua

@@ -740,3 +740,54 @@ local D = require("CON.DEFS")
 checkfail('require("CON.DEFS").APLAYER=123', "modifying base module table forbidden")
 -- Test with lunatic/test/rotfixed_actor.con.
 print("DUKECAR="..tostring(D.DUKECAR))
+
+do
+    print('---------- getangle test')
+
+    local function CreateGetAngFunc(roundfunc)
+        return function(x, y)
+            local ang = (1024/math.pi)*math.atan2(y, x)  -- note the swapped args
+            return bit.band(roundfunc(ang), 2047)
+        end
+    end
+
+    local ourgetang = CreateGetAngFunc(math.ceil)
+    local ourgetangf = CreateGetAngFunc(math.floor)
+
+    local function printang(x, y)
+        printf('%4d,%4d: %13d, %16d, %16d', x, y,
+               gv.getangle(x, y), ourgetang(x, y), ourgetangf(x, y))
+    end
+
+    print "   x,   y: getangle(x, y) | math.atan2/ceil | math.atan2/floor"
+    printang(10, 100)
+    printang(10, -100)
+    printang(-10, -100)
+    printang(-10, 100)
+
+    printang(0, 0)
+
+    printang(1, 0)
+    printang(0, 1)
+    printang(-1, 0)
+    printang(0, -1)
+
+    local N=1e5
+    local r = 0
+
+    local t = gv.gethiticks()
+    for i=1,N do
+        r = r + gv.getangle(10, i)
+    end
+    local t1 = gv.gethiticks()-t
+
+    r = 0
+    t = gv.gethiticks()
+    for i=1,N do
+        r = r + ourgetang(10, i)
+    end
+    local t2 = gv.gethiticks()-t
+
+    printf('Time for %d runs: getangle: %.03f ms, math.atan2: %.03f ms', N, t1, t2)
+    print('----------')
+end