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hexen: Convert demo code to use new demo API.

The vvHeretic bits are non-vanilla extensions and we should be able
to disable these entirely either when recording or playing back.

--- a/src/hexen/g_game.c

+++ b/src/hexen/g_game.c

@@ -1958,7 +1958,8 @@

     // Record or playback a demo with high resolution turning.

     //

-    longtics = M_ParmExists("-longtics");

+    longtics = D_NonVanillaRecord(M_ParmExists("-longtics"),

+                                  "vvHeretic longtics demo");

     // If not recording a longtics demo, record in low res

@@ -2005,7 +2006,7 @@

     //   0x02 = -nomonsters

     *demo_p = 1; // assume player one exists

-    if (respawnparm)

+    if (D_NonVanillaRecord(respawnparm, "vvHeretic -respawn header flag"))

     {

         *demo_p |= DEMOHEADER_RESPAWN;

     }

@@ -2013,7 +2014,7 @@

     {

         *demo_p |= DEMOHEADER_LONGTICS;

     }

-    if (nomonsters)

+    if (D_NonVanillaRecord(nomonsters, "vvHeretic -nomonsters header flag"))

     {

         *demo_p |= DEMOHEADER_NOMONSTERS;

     }

@@ -2046,21 +2047,6 @@

     gameaction = ga_playdemo;

 }

-// Returns true if the given lump number corresponds to data from a .lmp

-// file, as opposed to a WAD.

-static boolean IsDemoFile(int lumpnum)

-{

-    char *lower;

-    boolean result;

-

-    lower = M_StringDuplicate(lumpinfo[lumpnum]->wad_file->path);

-    M_ForceLowercase(lower);

-    result = M_StringEndsWith(lower, ".lmp");

-    free(lower);

-

-    return result;

-}

-

 void G_DoPlayDemo(void)

 {

     skill_t skill;

@@ -2075,20 +2061,24 @@

     map = *demo_p++;

     // When recording we store some extra options inside the upper bits

-    // of the player 1 present byte; this is equivalent to what vvHeretic

-    // does. However, only recognize these bits if they are in a demo file

-    // being played manually by the user; we ignore them (as is Vanilla

-    // behavior) if they are inside a WAD file.

-    // These extra bits are a convenience feature for demo playback, not

-    // an editing extension for WAD authors.

-    if (IsDemoFile(lumpnum))

+    // of the player 1 present byte. However, this is a non-vanilla extension.

+    // Note references to vvHeretic here; these are the extensions used by

+    // vvHeretic, which we're just reusing for Hexen demos too. There is no

+    // vvHexen.

+    if (D_NonVanillaPlayback((*demo_p & DEMOHEADER_LONGTICS) != 0,

+                             lumpnum, "vvHeretic longtics demo"))

     {

-        // Read special parameter bits: see G_RecordDemo() for details.

-        longtics = (*demo_p & DEMOHEADER_LONGTICS) != 0;

-

-        // don't overwrite arguments from the command line

-        respawnparm |= (*demo_p & DEMOHEADER_RESPAWN) != 0;

-        nomonsters |= (*demo_p & DEMOHEADER_NOMONSTERS) != 0;

+        longtics = true;

+    }

+    if (D_NonVanillaPlayback((*demo_p & DEMOHEADER_RESPAWN) != 0,

+                             lumpnum, "vvHeretic -respawn header flag"))

+    {

+        respawnparm = true;

+    }

+    if (D_NonVanillaPlayback((*demo_p & DEMOHEADER_NOMONSTERS) != 0,

+                             lumpnum, "vvHeretic -nomonsters header flag"))

+    {

+        nomonsters = true;

     }

     for (i = 0; i < maxplayers; i++)