Fix '-mission' and '-loadlevel' arguments

Descent3/Mission.cpp

@@ -641,6 +641,9 @@
 #include <cstdlib>
 #include <filesystem>
 
+#include "args.h"
+#include "ddio.h"
+#include "crossplat.h"
 #include "Mission.h"
 #include "3d.h"
 #include "LoadLevel.h"
@@ -742,6 +745,26 @@ void InitMission() {
   }
   atexit(ResetMission);
 }
+
+void InitDefaultMissionFromCLI() {
+  // Load mission on startup
+  int mission_arg = FindArg("-mission");
+  if (mission_arg > 0) {
+    std::filesystem::path filename = std::filesystem::path(GameArgs[mission_arg + 1]).filename().replace_extension(".mn3");
+    LoadMission((const char*)filename.u8string().c_str());
+
+    int level_arg = FindArg("-loadlevel");
+    if (level_arg > 0) {
+      int level{std::atoi(GameArgs[level_arg + 1])};
+      if (level <= 0 || level > Current_mission.num_levels) {
+        LOG_WARNING << "Invalid level selection, resetting to 1";
+        level = 1;
+      }
+      Current_mission.cur_level = level;
+    }
+  }
+}
+
 //	reset all states for a mission
 void ResetMission() {
   LOG_INFO << "In ResetMission()";
@@ -1784,14 +1807,16 @@ bool mn3_Open(const std::filesystem::path &mn3file) {
     /* Disabled loading scripts from .mn3 files on purpose:
     all 64-bit first-party level scripts have already been loaded from `PRIMARY_HOG`.
     Mission files contain only Win32 scripts by default, which cannot not be loaded on 64-bit builds.
-    Reactivate this when we have a proper sandbox system to safely run third-party scripts contained in user-made levels. */ 
+    Reactivate this when we have a proper sandbox system to safely run third-party scripts contained in user-made
+    levels. */
     // Osiris_ExtractScriptsFromHog(mn3_handle, true);
   }
   // do table file stuff.
   std::filesystem::path filename = mn3file.stem();
 
   std::filesystem::path voice_hog;
-  if ((stricmp((const char*)filename.u8string().c_str(), "d3") == 0) || (stricmp((const char*)filename.u8string().c_str(), "training") == 0)) {
+  if ((stricmp((const char *)filename.u8string().c_str(), "d3") == 0) ||
+      (stricmp((const char *)filename.u8string().c_str(), "training") == 0)) {
     // Open audio hog file
     voice_hog = std::filesystem::path("missions") / "d3voice1.hog"; // Audio for levels 1-4
     Mission_voice_hog_handle = cf_OpenLibrary(voice_hog);

Descent3/Mission.h

@@ -294,6 +294,9 @@ const char *GetMissionName(const char *mission);
 //	initializes mission system.
 void InitMission();
 
+// Load the mission and level from CLI arguments
+void InitDefaultMissionFromCLI();
+
 //	reset all states for a mission
 void ResetMission();
 

Descent3/gamesequence.cpp

@@ -1161,7 +1161,7 @@ bool GameSequencer() {
     break;
   case RESTORE_GAME_MODE:
   case LOADDEMO_MODE:
-    SetFunctionMode(GAME_MODE); // need to do so sequencer thiks we're in game.
+    SetFunctionMode(GAME_MODE); // need to do so sequencer thinks we're in game.
     break;
   }
 
@@ -1241,14 +1241,6 @@ bool GameSequencer() {
       SuspendControls();
       EndLevel(1);
       SetGameState(GAMESTATE_LVLNEXT);
-
-      // This is for HEAT.NET and their tournement mode stuff
-      // if(FindArg("-doonelevel"))
-      //	SetGameState(GAMESTATE_LVLSTART);
-      if (FindArg("-doonelevel")) {
-        SetFunctionMode(QUIT_MODE);
-      }
-
       break;
 
     case GAMESTATE_LVLNEXT:

Descent3/init.cpp

@@ -1544,28 +1544,6 @@ void InitIOSystems(bool editor) {
   // this one at the end to find our newly build script libraries first
   sys_hid = cf_OpenLibrary(PRIMARY_HOG);
 
-  // Check to see if there is a -mission command line option
-  // if there is, attempt to open that hog/mn3 so it can override such
-  // things as the mainmenu movie, or loading screen
-  int mission_arg = FindArg("-mission");
-  if (mission_arg > 0) {
-    char path_to_mission[_MAX_PATH];
-    char filename[256];
-
-    // get the true filename
-    ddio_SplitPath(GameArgs[mission_arg + 1], NULL, filename, NULL);
-    strcat(filename, ".mn3");
-
-    // make the full path (it is forced to be on the harddrive since it contains
-    // textures and stuff).
-    ddio_MakePath(path_to_mission, LocalD3Dir, "missions", filename, NULL);
-    if (cfexist(path_to_mission)) {
-      cf_OpenLibrary(path_to_mission);
-    } else {
-      Int3(); // mission not found
-    }
-  }
-
   // Initialize debug graph early incase any system uses it in its init
   INIT_MESSAGE(("Initializing debug graph."));
   DebugGraph_Initialize();
@@ -1864,6 +1842,7 @@ void InitD3Systems1(bool editor) {
 
   // Initialize missions
   InitMission();
+  InitDefaultMissionFromCLI();
 
   // Initializes the ship structure
   InitShips();

Descent3/menu.cpp

@@ -1010,13 +1010,13 @@ bool ProcessCommandLine() {
     exit_menu = 1;
 #endif
   }
-#ifndef RELEASE
-  int t = FindArg("-loadlevel");
-  if (t) {
-    SimpleStartLevel(GameArgs[t + 1]);
+  // On first load, enter mission directly if the argument is specified
+  int missionArg = FindArg("-mission");
+  static bool missionEntered = false;
+  if (missionArg && !missionEntered) {
+    missionEntered = true;
     exit_menu = 1;
   }
-#endif
   // at some point the code above sets exit_menu, so we're going to game mode.
   if (exit_menu) {
     SetFunctionMode(GAME_MODE);

USAGE.md

@@ -525,6 +525,16 @@ The following command-line options are available in Descent 3. You can set comma
 
 ### Other Options
 
+- `-loadlevel`
+
+    **Type:** int
+
+    **Default:** Off
+
+    **Platform:** all
+
+    **Description:** Load a specific level from the mission selected with `-mission`. Only has an effect when `-mission` is specified.
+
 - `-logfile`
 
     **Type:** boolean
@@ -563,7 +573,7 @@ The following command-line options are available in Descent 3. You can set comma
 
     **Platform:** all
 
-    **Description:** Loads the specified mission file at startup.
+    **Description:** Loads the specified mission file at startup. Example: `-mission d3` to load the main campaign. Combine this option with `-loadlevel` to load a specific level from the mission.
 
 - `-pilot <name>`