CON: Add command "startscreen" and corresponding EVENT_SCREEN.

Use startscreen to take control away from the game and display content with rotatesprite.

RETURN is set to 1 when any key is pressed, and if it is nonzero when the event ends, the screen ends and the game resumes.

Patch from Fox.

git-svn-id: https://svn.eduke32.com/eduke32@6508 1a8010ca-5511-0410-912e-c29ae57300e0

source/duke3d/src/events_defs.h

@@ -127,6 +127,7 @@ enum GameEvent_t {
     EVENT_POSTSAVEGAME,
     EVENT_PRECUTSCENE,
     EVENT_SKIPCUTSCENE,
+    EVENT_SCREEN,
 #ifdef LUNATIC
     EVENT_ANIMATEALLSPRITES,
 #endif

source/duke3d/src/gamedef.cpp

@@ -473,6 +473,7 @@ static tokenmap_t const vm_keywords[] =
     { "ssp",                    CON_SSP },
     { "startcutscene",          CON_STARTCUTSCENE },
     { "startlevel",             CON_STARTLEVEL },
+    { "startscreen",            CON_STARTSCREEN },
     { "starttrack",             CON_STARTTRACK },
     { "starttrackslot",         CON_STARTTRACKSLOT },
     { "starttrackvar",          CON_STARTTRACKVAR },
@@ -721,6 +722,7 @@ const char *EventNames[MAXEVENTS] =
     "EVENT_POSTSAVEGAME",
     "EVENT_PRECUTSCENE",
     "EVENT_SKIPCUTSCENE",
+    "EVENT_SCREEN",
 #ifdef LUNATIC
     "EVENT_ANIMATEALLSPRITES",
 #endif
@@ -6034,6 +6036,7 @@ repeatcase:
         case CON_INSERTSPRITEQ:
         case CON_STOPALLSOUNDS:
         case CON_STOPALLMUSIC:
+        case CON_STARTSCREEN:
             continue;
 
         case CON_NULLOP:

source/duke3d/src/gamedef.h

@@ -1146,6 +1146,7 @@ enum ScriptKeywords_t
     CON_STARTTRACKSLOT,     // 406
     CON_STOPALLMUSIC,       // 407
     CON_ACTORSOUND,         // 408
+    CON_STARTSCREEN,        // 409
     CON_END
 };
 // KEEPINSYNC with the keyword list in lunatic/con_lang.lua

source/duke3d/src/gameexec.cpp

@@ -1236,6 +1236,28 @@ LUNATIC_EXTERN void G_ShowView(vec3_t vec, int32_t a, int32_t horiz, int32_t sec
     G_UpdateScreenArea();
 }
 
+void Screen_Play(void)
+{
+    int32_t running = 1;
+
+    I_ClearAllInput();
+
+    do
+    {
+        G_HandleAsync();
+
+        clearallviews(0);
+        if (VM_OnEventWithReturn(EVENT_SCREEN, -1, myconnectindex, I_CheckAllInput()))
+            running = 0;
+
+        nextpage();
+
+        I_ClearAllInput();
+
+        ototalclock = totalclock + 1; // pause game like ANMs
+    } while (running);
+}
+
 #if !defined LUNATIC
 GAMEEXEC_STATIC void VM_Execute(int loop)
 {
@@ -2772,6 +2794,12 @@ nullquote:
                 continue;
             }
 
+        case CON_STARTSCREEN:
+            insptr++;
+            I_ClearAllInput();
+            Screen_Play();
+            continue;
+
         case CON_GUNIQHUDID:
             insptr++;
             {