Add project files.

FreedomFighter/.config/dotnet-tools.json

@@ -0,0 +1,36 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-mgcb": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb"
+      ]
+    },
+    "dotnet-mgcb-editor": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor"
+      ]
+    },
+    "dotnet-mgcb-editor-linux": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-linux"
+      ]
+    },
+    "dotnet-mgcb-editor-windows": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-windows"
+      ]
+    },
+    "dotnet-mgcb-editor-mac": {
+      "version": "3.8.4",
+      "commands": [
+        "mgcb-editor-mac"
+      ]
+    }
+  }
+}

FreedomFighter/.vscode/launch.json

@@ -0,0 +1,14 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "name": "C#: FreedomFighter Debug",
+        "type": "dotnet",
+        "request": "launch",
+        "projectPath": "${workspaceFolder}/FreedomFighter.csproj"
+      }
+    ],
+  }

FreedomFighter/Content/Content.mgcb

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+
+#----------------------------- Global Properties ----------------------------#
+
+/outputDir:bin/$(Platform)
+/intermediateDir:obj/$(Platform)
+/platform:Windows
+/config:
+/profile:Reach
+/compress:False
+
+#-------------------------------- References --------------------------------#
+
+
+#---------------------------------- Content ---------------------------------#
+
+#begin Verdana12.spritefont
+/importer:FontDescriptionImporter
+/processor:FontDescriptionProcessor
+/processorParam:PremultiplyAlpha=False
+/processorParam:TextureFormat=Color
+/build:Verdana12.spritefont
+
+#begin Verdana20.spritefont
+/importer:FontDescriptionImporter
+/processor:FontDescriptionProcessor
+/processorParam:PremultiplyAlpha=False
+/processorParam:TextureFormat=Color
+/build:Verdana20.spritefont
+

FreedomFighter/Content/Verdana12.spritefont

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+<?xml version="1.0" encoding="utf-8"?>
+<XnaContent xmlns:Graphics="Microsoft.Xna.Framework.Content.Pipeline.Graphics">
+  <Asset Type="Graphics:FontDescription">
+    <FontName>Verdana</FontName>
+    <Size>16</Size>
+    <Spacing>0</Spacing>
+    <UseKerning>true</UseKerning>
+    <Style>Bold</Style>
+    <CharacterRegions>
+      <CharacterRegion>
+        <Start>&#32;</Start>
+        <End>&#126;</End>
+      </CharacterRegion>
+    </CharacterRegions>
+  </Asset>
+</XnaContent>

FreedomFighter/Content/Verdana20.spritefont

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+<?xml version="1.0" encoding="utf-8"?>
+<XnaContent xmlns:Graphics="Microsoft.Xna.Framework.Content.Pipeline.Graphics">
+  <Asset Type="Graphics:FontDescription">
+    <FontName>Verdana</FontName>
+    <Size>27</Size>
+    <Spacing>0</Spacing>
+    <UseKerning>true</UseKerning>
+    <Style>Bold</Style>
+    <CharacterRegions>
+      <CharacterRegion>
+        <Start>&#32;</Start>
+        <End>&#126;</End>
+      </CharacterRegion>
+    </CharacterRegions>
+  </Asset>
+</XnaContent>

FreedomFighter/Content/gfx/manifest.json

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+{
+  "OmegaImageList1": [
+    {
+      "Index": 0,
+      "Name": "player",
+      "File": "omegaimagelist1_00_player.png",
+      "TileWidth": 64,
+      "TileHeight": 64
+    },
+    {
+      "Index": 1,
+      "Name": "enemy",
+      "File": "omegaimagelist1_01_enemy.png",
+      "TileWidth": 34,
+      "TileHeight": 34
+    },
+    {
+      "Index": 2,
+      "Name": "bullet",
+      "File": "omegaimagelist1_02_bullet.png",
+      "TileWidth": 34,
+      "TileHeight": 34
+    },
+    {
+      "Index": 3,
+      "Name": "explosion",
+      "File": "omegaimagelist1_03_explosion.png",
+      "TileWidth": 32,
+      "TileHeight": 34
+    },
+    {
+      "Index": 4,
+      "Name": "water",
+      "File": "omegaimagelist1_04_water.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 5,
+      "Name": "lives",
+      "File": "omegaimagelist1_05_lives.png",
+      "TileWidth": 34,
+      "TileHeight": 34
+    },
+    {
+      "Index": 6,
+      "Name": "score",
+      "File": "omegaimagelist1_06_score.png",
+      "TileWidth": 69,
+      "TileHeight": 20
+    },
+    {
+      "Index": 7,
+      "Name": "enemy2",
+      "File": "omegaimagelist1_07_enemy2.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 8,
+      "Name": "enemybullet",
+      "File": "omegaimagelist1_08_enemybullet.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 9,
+      "Name": "boss",
+      "File": "omegaimagelist1_09_boss.png",
+      "TileWidth": 98,
+      "TileHeight": 98
+    },
+    {
+      "Index": 10,
+      "Name": "sub",
+      "File": "omegaimagelist1_10_sub.png",
+      "TileWidth": 32,
+      "TileHeight": 98
+    },
+    {
+      "Index": 11,
+      "Name": "bigexplosion",
+      "File": "omegaimagelist1_11_bigexplosion.png",
+      "TileWidth": 65,
+      "TileHeight": 65
+    },
+    {
+      "Index": 12,
+      "Name": "turret",
+      "File": "omegaimagelist1_12_turret.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 13,
+      "Name": "boss2",
+      "File": "omegaimagelist1_13_boss2.png",
+      "TileWidth": 161,
+      "TileHeight": 142
+    },
+    {
+      "Index": 14,
+      "Name": "cruiser",
+      "File": "omegaimagelist1_14_cruiser.png",
+      "TileWidth": 41,
+      "TileHeight": 197
+    },
+    {
+      "Index": 15,
+      "Name": "tactical",
+      "File": "omegaimagelist1_15_tactical.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 16,
+      "Name": "player2",
+      "File": "omegaimagelist1_16_player2.png",
+      "TileWidth": 73,
+      "TileHeight": 45
+    },
+    {
+      "Index": 17,
+      "Name": "mine",
+      "File": "omegaimagelist1_17_mine.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 18,
+      "Name": "missile_turret",
+      "File": "omegaimagelist1_18_missile_turret.png",
+      "TileWidth": 64,
+      "TileHeight": 64
+    },
+    {
+      "Index": 19,
+      "Name": "missile",
+      "File": "omegaimagelist1_19_missile.png",
+      "TileWidth": 16,
+      "TileHeight": 16
+    },
+    {
+      "Index": 20,
+      "Name": "scanner",
+      "File": "omegaimagelist1_20_scanner.png",
+      "TileWidth": 800,
+      "TileHeight": 32
+    }
+  ],
+  "OmegaImageList2": [
+    {
+      "Index": 0,
+      "Name": "numbers",
+      "File": "omegaimagelist2_00_numbers.png",
+      "TileWidth": 12,
+      "TileHeight": 15
+    },
+    {
+      "Index": 1,
+      "Name": "title",
+      "File": "omegaimagelist2_01_title.png",
+      "TileWidth": 278,
+      "TileHeight": 141
+    },
+    {
+      "Index": 2,
+      "Name": "gameover",
+      "File": "omegaimagelist2_02_gameover.png",
+      "TileWidth": 97,
+      "TileHeight": 16
+    },
+    {
+      "Index": 3,
+      "Name": "title2",
+      "File": "omegaimagelist2_03_title2.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    },
+    {
+      "Index": 4,
+      "Name": "newgame",
+      "File": "omegaimagelist2_04_newgame.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    },
+    {
+      "Index": 5,
+      "Name": "options",
+      "File": "omegaimagelist2_05_options.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    },
+    {
+      "Index": 6,
+      "Name": "highscore",
+      "File": "omegaimagelist2_06_highscore.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    },
+    {
+      "Index": 7,
+      "Name": "credits",
+      "File": "omegaimagelist2_07_credits.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    },
+    {
+      "Index": 8,
+      "Name": "quit",
+      "File": "omegaimagelist2_08_quit.png",
+      "TileWidth": 360,
+      "TileHeight": 60
+    }
+  ],
+  "OmegaImageList3": [
+    {
+      "Index": 0,
+      "Name": "bar",
+      "File": "omegaimagelist3_00_bar.png",
+      "TileWidth": 130,
+      "TileHeight": 14
+    },
+    {
+      "Index": 1,
+      "Name": "health",
+      "File": "omegaimagelist3_01_health.png",
+      "TileWidth": 7,
+      "TileHeight": 10
+    },
+    {
+      "Index": 2,
+      "Name": "weapon",
+      "File": "omegaimagelist3_02_weapon.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 3,
+      "Name": "energy",
+      "File": "omegaimagelist3_03_energy.png",
+      "TileWidth": 7,
+      "TileHeight": 10
+    }
+  ],
+  "OmegaImageList4": [
+    {
+      "Index": 0,
+      "Name": "Tiles",
+      "File": "omegaimagelist4_00_Tiles.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 1,
+      "Name": "collision",
+      "File": "omegaimagelist4_01_collision.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    },
+    {
+      "Index": 2,
+      "Name": "trigger",
+      "File": "omegaimagelist4_02_trigger.png",
+      "TileWidth": 32,
+      "TileHeight": 32
+    }
+  ],
+  "OmegaImageList5": [
+    {
+      "Index": 0,
+      "Name": "",
+      "File": "omegaimagelist5_00_unnamed.png",
+      "TileWidth": 9,
+      "TileHeight": 9
+    }
+  ]
+}

FreedomFighter/Entities.cs

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+using System;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+// Entity classes ported 1:1 from GameU.pas, including quirks
+// (e.g. TEnemy moves inside Draw, missiles can target stray sprites).
+
+public class Player : Sprite
+{
+    public int Health;
+    public int FireRate;
+    public int Power;
+    public Weapon Weapon;
+
+    public Player(SpriteManager m) : base(m) { }
+
+    public override void Move(float moveCount)
+    {
+        var input = G.Input;
+
+        if (input.Button5Clicked) { G.Music.Songs[6].Play(); Weapon = Weapon.Reg; }
+        if (input.Button6Clicked) { G.Music.Songs[6].Play(); Weapon = Weapon.Super; }
+        if (input.Button7Clicked) { G.Music.Songs[6].Play(); Weapon = Weapon.Multi; }
+
+        if (FireRate > 1)
+            FireRate--;
+
+        if (input.Button4 && FireRate == 1 && Weapon == Weapon.Reg)
+            Bullet.Spawn(X + Width / 2 - 16, Y - 34, 0, 3, 0);
+        else if (input.Button4 && FireRate == 1 && Weapon == Weapon.Super)
+        {
+            Bullet.Spawn(X + Width / 2 - 16 - 12, Y - 34, 0, 3, 0);
+            Bullet.Spawn(X + Width / 2 - 16 + 12, Y - 34, 0, 3, 0);
+        }
+        if (input.Button4 && FireRate == 1 && Weapon == Weapon.Multi)
+        {
+            Bullet.Spawn(X + Width / 2 - 16, Y - 34, 2, 3, -35);
+            Bullet.Spawn(X + Width / 2 - 16, Y - 34, 0, 3, 0);
+            Bullet.Spawn(X + Width / 2 - 16, Y - 34, -2, 3, 35);
+        }
+
+        if (input.Button8 && FireRate == 1)
+        {
+            G.Music.Songs[13].Play();
+            Missile.Spawn(X + Width / 2, Y, 2);
+            FireRate = 20;
+        }
+
+        if (input.Left && input.Up) { X -= 3; Y -= 3; }
+        else if (input.Left && input.Down) { X -= 3; Y += 3; }
+        else if (input.Right && input.Up) { X += 3; Y -= 3; }
+        else if (input.Right && input.Down) { X += 3; Y += 3; }
+        else if (input.Left) X -= 3;
+        else if (input.Right) X += 3;
+        else if (input.Up) Y -= 3;
+        else if (input.Down) Y += 3;
+
+        if (X + Width > 800) X = 800 - Width;
+        if (X < 0) X = 0;
+        if (Y + Height > 600) Y = 600 - Height;
+        if (Y < 0) Y = 0;
+    }
+}
+
+public class DemoShip : Sprite
+{
+    public DemoShip(SpriteManager m) : base(m) { }
+}
+
+public class Enemy : Sprite
+{
+    public float YVel;
+    public int Health;
+    public string MoveDir = "";
+    public AI AI;
+    public bool Charging;
+    public int HitTimer;
+    public int FireRate;
+    public int ExplodeTime;
+    public int AnimTicks;
+
+    public Enemy(SpriteManager m) : base(m) { }
+
+    public override void Move(float moveCount)
+    {
+        if (HitTimer < 255)
+        {
+            HitTimer += 15;
+            SetBlue(HitTimer);
+            SetGreen(HitTimer);
+        }
+
+        switch (AI)
+        {
+            case AI.Normal:
+            case AI.Hunt:
+                if (G.Random(1000) < 5)
+                    EnemyBullet.Spawn(X, Y, 3, 0);
+                break;
+
+            case AI.Tactical:
+                Y += YVel;
+                if (!Charging && Y > 200)
+                {
+                    YVel = 1;
+                    G.TFCounter++;
+                    if (G.TFCounter > 16)
+                    {
+                        G.TFCounter = 0;
+                        if (ImageIndex < 4)
+                            ImageIndex++;
+                        else
+                        {
+                            Charging = true;
+                            YVel = -2;
+                        }
+                    }
+                }
+                if (Charging && Y < -100)
+                {
+                    ImageIndex = 0;
+                    YVel = 5;
+                }
+                break;
+
+            case AI.Mine:
+                if (AnimTicks > ExplodeTime)
+                {
+                    Kill();
+                    Explosion.Spawn(X, Y, false, false);
+                    for (int angle = 360; angle >= 0; angle -= 45)
+                        EnemyBullet.Spawn(X, Y, 2, angle);
+                }
+                break;
+
+            case AI.Turret:
+                if (FireRate < 0)
+                {
+                    EnemyBullet.Spawn(X + 16, Y + 16, 3, Rotation);
+                    FireRate = 40;
+                }
+                break;
+        }
+
+        if (Y > G.ScreenHeight)
+            Kill();
+    }
+
+    public override void OnCollision(Sprite sprite, int colX, int colY)
+    {
+        if (sprite is Player)
+        {
+            G.Music.Songs[11].Play();
+            Kill();
+            G.Player.Health--;
+            Explosion.Spawn(X, Y, false, false);
+        }
+
+        if (sprite is Bullet)
+        {
+            Health--;
+            sprite.Kill();
+
+            if (Health < 1)
+            {
+                Explosion.Spawn(X, Y, false, false);
+                G.Music.Songs[11].Play();
+                Kill();
+                G.ShipsKilled++;
+                if (G.Player.Power < 18) G.Player.Power++;
+                G.Score += 10;
+            }
+            else
+            {
+                HitTimer = 0;
+                G.Music.Songs[10].Volume = 60;
+                G.Music.Songs[10].Play();
+            }
+        }
+
+        if (sprite is Missile)
+        {
+            Health -= 5;
+            sprite.Kill();
+
+            G.Music.Songs[10].Volume = 60;
+            G.Music.Songs[10].Play();
+
+            if (Health < 1)
+            {
+                Explosion.Spawn(X, Y, false, false);
+                G.Music.Songs[11].Play();
+                Kill();
+                G.ShipsKilled++;
+                if (G.Player.Power < 18) G.Player.Power++;
+                G.Score += 10;
+            }
+            else
+                HitTimer = 0;
+        }
+    }
+
+    // The original moved enemies inside Draw; preserved for identical behavior.
+    public override void Draw(SpriteBatch sb)
+    {
+        base.Draw(sb);
+
+        switch (AI)
+        {
+            case AI.Normal:
+            case AI.None:
+                Y += YVel;
+                break;
+
+            case AI.Hunt:
+                Y += YVel;
+                if (Y > 200)
+                {
+                    Y += YVel;   // double speed
+                    if (G.Player.X > X) X++;
+                    if (G.Player.X < X) X--;
+                }
+                break;
+
+            case AI.Mine:
+                Y += 1.5f;
+                Rotation += 0.5f;
+                if (Rotation > 359) Rotation = 0;
+                AnimTicks++;
+                break;
+
+            case AI.Turret:
+                Rotation = (float)(180 / Math.PI * Math.Atan2(Y - G.Player.Y, X - G.Player.X)) + 90;
+                if (Rotation > 360) Rotation -= 360;
+                else if (Rotation < 0) Rotation += 360;
+                FireRate--;
+                Y += YVel;
+                break;
+        }
+
+        if (Y > G.ScreenHeight)
+            Kill();
+    }
+}
+
+public class Boss : Sprite
+{
+    public float YVel;
+    public int Health;
+    public string MoveDir = "";
+    public int HitTimer;
+    public AI AI;
+    public int Timer;
+    public int RandX;
+
+    public Boss(SpriteManager m) : base(m) { }
+
+    public override void Move(float moveCount)
+    {
+        if (HitTimer < 255)
+        {
+            HitTimer += 15;
+            SetBlue(HitTimer);
+            SetGreen(HitTimer);
+        }
+
+        if (AI == AI.Boss)
+        {
+            if (G.Random(1000) < 10)
+            {
+                EnemyBullet.Spawn(X, Y + 40, 3, 0);
+                EnemyBullet.Spawn(X + 32, Y + 40, 3, 0);
+                EnemyBullet.Spawn(X + 64, Y + 40, 3, 0);
+            }
+
+            Y += YVel;
+
+            if (Y > 300)
+            {
+                Y = 300;
+                if (MoveDir == "right") X++;
+                if (MoveDir == "left") X--;
+
+                if (X > G.ScreenWidth - 98 && MoveDir == "right")
+                {
+                    X = G.ScreenWidth - 98;
+                    MoveDir = "left";
+                }
+                if (X < 0 && MoveDir == "left")
+                {
+                    MoveDir = "right";
+                    X = 0;
+                }
+            }
+        }
+        else if (AI == AI.Boss2)
+        {
+            Timer++;
+            if (Timer > 200)
+            {
+                RandX = G.Random(10);
+                Timer = 0;
+            }
+
+            if (MoveDir == "down" && Timer % 25 == 0)
+            {
+                EnemyBullet.Spawn(X + 40, Y + Height, 3, 0);
+                EnemyBullet.Spawn(X + 50, Y + Height, 3, 0);
+                EnemyBullet.Spawn(X + 60, Y + Height, 3, 0);
+                EnemyBullet.Spawn(X + 70, Y + Height, 3, 0);
+            }
+
+            if (RandX > 7) X++;
+            else if (RandX > 2) { /* hold */ }
+            else X--;
+
+            if (MoveDir == "down") Y++;
+            if (MoveDir == "up") Y -= 2;
+
+            if (Y > 300 && MoveDir == "down") { Y = 300; MoveDir = "up"; }
+            if (Y < -100 && MoveDir == "up") { MoveDir = "down"; Y = -100; }
+
+            if (X > 800 - Width) { X = 800 - Width; RandX = 0; }
+            if (X < 0) { X = 0; RandX = 8; }
+        }
+    }
+
+    public override void OnCollision(Sprite sprite, int colX, int colY)
+    {
+        if (sprite is Bullet)
+        {
+            sprite.Kill();
+            Health--;
+            HitTimer = 0;
+
+            if (Health == 0)
+            {
+                Kill();
+                Explosion.Spawn(X, Y, true, true);
+                G.Score += 1000;
+            }
+        }
+
+        if (sprite is Missile)
+        {
+            sprite.Kill();
+            Health -= 5;
+            HitTimer = 0;
+
+            if (Health < 1)
+            {
+                Kill();
+                Explosion.Spawn(X, Y, true, true);
+                G.Score += 1000;
+            }
+        }
+    }
+}
+
+public class Bullet : Sprite
+{
+    public float XVel, YVel;
+
+    public Bullet(SpriteManager m) : base(m) { }
+
+    public static void Spawn(float x, float y, float xVel, float yVel, float rotation)
+    {
+        var b = new Bullet(G.Sprites)
+        {
+            Width = 34,
+            Height = 34,
+            X = x,
+            Y = y,
+            XVel = xVel,
+            YVel = yVel,
+            Rotation = rotation,
+            Image = G.Images.IL1[2],
+            ImageIndex = 0,
+            CenterX = 0.5f,
+            CenterY = 0.5f,
+            DoCollision = true,
+            DoPixelCheck = true,
+        };
+        G.Player.FireRate = 20;
+    }
+
+    public override void Move(float moveCount)
+    {
+        X -= XVel;
+        Y -= YVel;
+
+        if (Y > 600 || Y < 0 || X > 800 || X < 0)
+            Kill();
+    }
+}
+
+public class EnemyBullet : Sprite
+{
+    public float XVel, YVel;
+
+    public EnemyBullet(SpriteManager m) : base(m) { }
+
+    public static void Spawn(float x, float y, float vel, float rotation)
+    {
+        double rad = Math.PI / 180 * (rotation + 90);
+        _ = new EnemyBullet(G.Sprites)
+        {
+            Name = "EnemyBullet",
+            X = x,
+            Y = y,
+            Rotation = rotation,
+            CenterX = 0.5f,
+            CenterY = 0.5f,
+            XVel = vel * (float)Math.Cos(rad),
+            YVel = vel * (float)Math.Sin(rad),
+            Width = 32,
+            Height = 32,
+            Image = G.Images.IL1[8],
+            ImageIndex = 0,
+            DoCollision = true,
+            DoPixelCheck = true,
+        };
+    }
+
+    public override void Move(float moveCount)
+    {
+        X += XVel;
+        Y += YVel;
+
+        if (X > G.ScreenWidth || X < 0 || Y > G.ScreenHeight || Y < 0)
+            Kill();
+    }
+
+    public override void OnCollision(Sprite sprite, int colX, int colY)
+    {
+        if (sprite is Player)
+        {
+            Kill();
+            G.Player.Health--;
+        }
+    }
+}
+
+public class Missile : Sprite
+{
+    public float XVel, YVel;
+    public Sprite? Target;
+
+    public Missile(SpriteManager m) : base(m) { }
+
+    public static void Spawn(float x, float y, float yVel)
+    {
+        var missile = new Missile(G.Sprites)
+        {
+            Name = "Missile",
+            X = x,
+            Y = y,
+            Rotation = 180,
+            YVel = yVel,
+            Width = 16,
+            Height = 16,
+            Image = G.Images.IL1[19],
+            ImageIndex = 0,
+            DoCollision = true,
+            DoPixelCheck = true,
+        };
+        missile.Target = missile.GetTarget();
+    }
+
+    public Sprite? GetTarget()
+    {
+        Sprite? target = null;
+        float prevDist = 800;
+
+        foreach (var s in G.Sprites.Items)
+        {
+            float dx = X - s.X;
+            float dy = Y - s.Y;
+            float distance = (float)Math.Sqrt(dx * dx + dy * dy);
+
+            // faithful to the original: filters by Name only, so unnamed sprites
+            // (fighters, but also player bullets and explosions) are all fair game
+            if (distance < prevDist && s.Name != "Player" && s.Name != "EnemyBullet" && s.Name != "Missile")
+            {
+                target = s;
+                prevDist = distance;
+            }
+        }
+        return target;
+    }
+
+    public override void Move(float moveCount)
+    {
+        if (Target != null)
+        {
+            if (Y > Target.Y)
+            {
+                Rotation = (float)(180 / Math.PI * Math.Atan2(Y - Target.Y, X - Target.X)) + 90;
+                if (Rotation > 360) Rotation -= 360;
+                else if (Rotation < 0) Rotation += 360;
+            }
+            double rad = Math.PI / 180 * (Rotation + 90);
+            X += (float)Math.Cos(rad);
+            Y += YVel * (float)Math.Sin(rad);
+        }
+        else
+        {
+            double rad = Math.PI / 180 * (Rotation + 90);
+            Y += YVel * (float)Math.Sin(rad);
+            X += (float)Math.Cos(rad);
+            Target = GetTarget();
+        }
+
+        if (Y < 0)
+            Kill();
+        if (X < 0 || X > G.ScreenWidth)
+            Kill();
+    }
+}
+
+public class Explosion : Sprite
+{
+    public int MaxFrames;
+    public int ECounter;
+    public bool IsBoss;
+
+    public Explosion(SpriteManager m) : base(m) { }
+
+    public static void Spawn(float x, float y, bool big, bool boss)
+    {
+        int frames = big ? 6 : 5;
+        int imageIdx = big ? 11 : 3;
+        int tileWidth = big ? 65 : 32;
+        int tileHeight = big ? 65 : 34;
+
+        _ = new Explosion(G.Sprites)
+        {
+            X = x,
+            Y = y,
+            Width = tileWidth,
+            Height = tileHeight,
+            Image = G.Images.IL1[imageIdx],
+            ImageIndex = 0,
+            DoCollision = false,
+            MaxFrames = frames,
+            ECounter = 0,
+            IsBoss = boss,
+        };
+    }
+
+    public override void Move(float moveCount)
+    {
+        Y += 1;
+        ECounter++;
+
+        if (ECounter > 6)
+        {
+            ImageIndex++;
+            ECounter = 0;
+        }
+
+        if (ImageIndex > MaxFrames)
+        {
+            if (IsBoss)
+                G.Done = true;
+            Kill();
+        }
+    }
+}

FreedomFighter/FreedomFighter.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <RollForward>Major</RollForward>
+    <PublishReadyToRun>false</PublishReadyToRun>
+    <TieredCompilation>false</TieredCompilation>
+    <UseWindowsForms>true</UseWindowsForms>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <ApplicationIcon>Icon.ico</ApplicationIcon>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="MonoGame.Framework.WindowsDX" Version="3.8.*" />
+    <PackageReference Include="MonoGame.Content.Builder.Task" Version="3.8.*" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Content\gfx\**;Content\maps\**;Content\tilesets\**;Content\sfx\**;Content\music\**" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+  <Target Name="RestoreDotnetTools" BeforeTargets="CollectPackageReferences">
+    <Message Text="Restoring dotnet tools (this might take a while depending on your internet speed and should only happen upon building your project for the first time, or after upgrading MonoGame, or clearing your nuget cache)" Importance="High" />
+    <Exec Command="dotnet tool restore" />
+  </Target>
+</Project>

FreedomFighter/G.cs

@@ -0,0 +1,74 @@
+using System;
+
+namespace FreedomFighter;
+
+public enum GameState { Intro, Idle, Intermission, Playing, Stats, Shop, GameOver, Credits, HighScore, EnterName }
+
+public enum Weapon { Reg, Super, Multi }
+
+public enum AI { Normal, Hunt, Tactical, Mine, Turret, Boss, Boss2, None }
+
+public enum ObjectType { Fighter, Kamikaze, Tactical, Mine, MissileBase, MissileTurret, Scanner, Boss, Boss2 }
+
+public struct Camera
+{
+    public int X, Y, Width, Height;
+}
+
+/// <summary>
+/// The global variables from GameU.pas, kept global to preserve the original's structure.
+/// </summary>
+public static class G
+{
+    public const int ScreenWidth = 800;
+    public const int ScreenHeight = 600;
+    public const string Version = "BETA 5";
+
+    public const int MUS_LEVEL1 = 0;
+    public const int MUS_GAMEOVER = 3;
+    public const int MUS_TITLE = 4;
+
+    public static Game1 Game = null!;
+    public static SpriteManager Sprites = null!;
+    public static ImageLists Images = null!;
+    public static MusicManager Music = null!;
+    public static GameMap Map = null!;
+    public static OmegaInput Input = null!;
+    public static HighScores HighScores = null!;
+    public static Random Rnd = new();
+
+    public static GameState State;
+    public static bool BossMode;
+    public static bool Done;
+
+    public static Player Player = null!;
+
+    public static int Counter;
+    public static int Change;
+    public static int CurCount;
+
+    public static int Score;
+    public static int Lives;
+    public static int ShipsKilled;
+    public static int Level;
+
+    public static Camera Camera;
+    public static int NewCamX, NewCamY;
+
+    public static int TextNum;
+    public static bool TextCreated;
+    public static int TFCounter;
+
+    public static int CurSelection = 4;
+    public static int[] MainMenu = new int[5];
+    public static int Prev = 4;
+
+    public static GameText GameTextObj = null!;
+    public static GameText TitleText = null!;
+    public static GameText IdText = null!;
+
+    public static BitmapFont BitmapFont1 = null!;  // numbers
+    public static BitmapFont BitmapFont2 = null!;  // A-Z
+
+    public static int Random(int max) => max <= 0 ? 0 : Rnd.Next(max);
+}

FreedomFighter/Game1.cs

@@ -0,0 +1,943 @@
+using System;
+using System.IO;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Port of GameU.pas. The original ran all logic inside the OmegaTimer render
+/// callback, so this port keeps that structure: everything happens in Draw(),
+/// paced by a 120 Hz fixed timestep (the original's MaxFPS).
+/// </summary>
+public class Game1 : Game
+{
+    readonly GraphicsDeviceManager _graphics;
+    SpriteBatch _sb = null!;
+    SpriteFont _font12 = null!;
+    SpriteFont _font20 = null!;
+
+    bool _paused;
+    string _enteredName = "";
+    DemoShip? _demoShip;
+
+    // debug screenshot support (--shot)
+    public string? ShotFile;
+    public int ShotFrames = 30;
+    public int StartLevel;
+
+    // FPS measurement (the original drew OmegaTimer1.FPS)
+    int _fps, _fpsFrames;
+    double _fpsTimer;
+
+    public Game1()
+    {
+        _graphics = new GraphicsDeviceManager(this)
+        {
+            PreferredBackBufferWidth = G.ScreenWidth,
+            PreferredBackBufferHeight = G.ScreenHeight,
+            SynchronizeWithVerticalRetrace = false,
+        };
+        Content.RootDirectory = "Content";
+        IsMouseVisible = true;
+        IsFixedTimeStep = true;
+        TargetElapsedTime = TimeSpan.FromSeconds(1 / 120.0);
+        Window.Title = "Freedom Fighter";
+    }
+
+    protected override void LoadContent()
+    {
+        _sb = new SpriteBatch(GraphicsDevice);
+        _font12 = Content.Load<SpriteFont>("Verdana12");
+        _font20 = Content.Load<SpriteFont>("Verdana20");
+
+        string contentDir = Path.Combine(AppContext.BaseDirectory, "Content");
+
+        G.Game = this;
+        G.Sprites = new SpriteManager();
+        G.Images = new ImageLists(GraphicsDevice, contentDir);
+        G.Music = new MusicManager();
+        G.Music.Load(contentDir);
+        G.Map = new GameMap(GraphicsDevice, contentDir);
+        G.Input = new OmegaInput();
+        G.HighScores = new HighScores();
+        G.HighScores.Load();
+
+        // OmegaScreen1Init: bitmap font setup
+        G.BitmapFont1 = new BitmapFont(G.Images.IL2[0], "0123456789");
+        G.BitmapFont2 = new BitmapFont(G.Images.IL5[0], "ABCDEFGHIJKLMNOPQRSTUVWXYZ ");
+
+        // FormCreate
+        G.GameTextObj = new GameText("", 60, G.BitmapFont2);
+        G.BitmapFont2.Red = 0;
+        G.BitmapFont2.Green = 200;
+        G.BitmapFont2.Blue = 200;
+
+        G.State = GameState.Idle;
+        G.MainMenu = [0, 0, 0, 0, 1];
+        G.Prev = 4;
+
+        G.Camera.Width = G.ScreenWidth;
+        G.Camera.Height = G.ScreenHeight;
+
+        G.Music.Songs[G.MUS_TITLE].Volume = 25;
+        G.Music.Songs[G.MUS_TITLE].Play();
+
+        if (StartLevel > 0)   // debug: jump straight into a level
+        {
+            ResetAll();
+            G.Level = StartLevel;
+            G.State = GameState.Intermission;
+            G.Counter = 495;
+        }
+    }
+
+    protected override void Update(GameTime gameTime)
+    {
+        // all logic runs in Draw, matching the original's timer callback
+        base.Update(gameTime);
+    }
+
+    protected override void Draw(GameTime gameTime)
+    {
+        _fpsFrames++;
+        _fpsTimer += gameTime.ElapsedGameTime.TotalSeconds;
+        if (_fpsTimer >= 1) { _fps = _fpsFrames; _fpsFrames = 0; _fpsTimer -= 1; }
+
+        G.Input.Update();
+
+        if (G.Input.PauseClicked)
+            _paused = !_paused;
+        if (_paused)
+        {
+            base.Draw(gameTime);
+            return;
+        }
+
+        GraphicsDevice.Clear(Color.Black);
+        _sb.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.PointClamp);
+
+        G.Sprites.Move(0);
+
+        switch (G.State)
+        {
+            case GameState.Intro: DoIntro(); break;
+            case GameState.Idle: DrawMenu(); break;
+            case GameState.Intermission: DoIntermission(); break;
+            case GameState.Playing: GameLoop(); break;
+            case GameState.Stats: DoStats(); break;
+            case GameState.Shop: DoShop(); break;
+            case GameState.GameOver: DoGameOver(); break;
+            case GameState.Credits: DoCredits(); break;
+            case GameState.HighScore: DoHighScore(); break;
+            case GameState.EnterName: DoEnterName(); break;
+        }
+
+        G.Sprites.Collision();
+        G.Sprites.RemoveDead();
+        G.Sprites.Draw(_sb);
+
+        _sb.End();
+        base.Draw(gameTime);
+
+        if (ShotFile != null && --ShotFrames <= 0)
+        {
+            SaveScreenshot(ShotFile);
+            ShotFile = null;
+            Exit();
+        }
+    }
+
+    void SaveScreenshot(string file)
+    {
+        int w = GraphicsDevice.PresentationParameters.BackBufferWidth;
+        int h = GraphicsDevice.PresentationParameters.BackBufferHeight;
+        var data = new Color[w * h];
+        GraphicsDevice.GetBackBufferData(data);
+        using var tex = new Texture2D(GraphicsDevice, w, h);
+        tex.SetData(data);
+        using var fs = File.Create(file);
+        tex.SaveAsPng(fs, w, h);
+    }
+
+    // ================================================================ helpers
+
+    void PrintFps(int x, int y) =>
+        _sb.DrawString(_font12, "FPS: " + _fps, new Vector2(x, y), Color.White);
+
+    void ResetAll()
+    {
+        G.Change = 0;
+        G.Score = 0;
+        G.Lives = 3;
+    }
+
+    void ResetPlayer()
+    {
+        var p = new Player(G.Sprites) { Name = "Player" };
+        // original computed X before assigning Width (Width was still 0)
+        p.X = G.ScreenWidth / 2 - p.Width;
+        p.Y = G.ScreenHeight - 80;
+        p.Health = 16;
+        p.FireRate = 20;
+        p.Width = 73;
+        p.Height = 45;
+        p.Image = G.Images.IL1[0];
+        p.Weapon = Weapon.Reg;
+        p.ImageIndex = 0;
+        p.DoPixelCheck = true;
+        p.DoCollision = true;
+        p.CenterX = 0.5f;
+        p.CenterY = 0.5f;
+        G.Player = p;
+    }
+
+    void ClipCamera(float x, float y, int width, int height)
+    {
+        if (x < G.Camera.Width / 2f)
+            G.NewCamX = 0;
+        else
+            G.NewCamX = (int)(x + width / 2f - G.Camera.Width / 2f);
+
+        if (y < G.Camera.Height / 2f)
+            G.NewCamY = 0;
+        else
+            G.NewCamY = (int)(y + height / 2f - G.Camera.Height / 2f);
+
+        // the min/max clips were commented out in the original, leaving these unconditional
+        G.NewCamX = G.Map.WidthCount * 32 - G.Camera.Width;
+        G.NewCamY = G.Map.HeightCount * 32 - G.Camera.Height;
+
+        int frameCamSpeed = 1;
+        if (G.NewCamX > G.Camera.X)
+        {
+            G.Camera.X += frameCamSpeed;
+            if (G.NewCamX < G.Camera.X) G.Camera.X = G.NewCamX;
+        }
+        else if (G.NewCamX < G.Camera.X)
+        {
+            G.Camera.X -= frameCamSpeed;
+            if (G.NewCamX > G.Camera.X) G.Camera.X = G.NewCamX;
+        }
+        // Y seek was commented out in the original
+    }
+
+    void DrawLayer1()
+    {
+        var tileset = G.Map.Tileset;
+        if (tileset == null) return;
+
+        for (int a = 0; a <= G.Camera.Width / 32 + 1; a++)
+            for (int b = 0; b <= G.Camera.Height / 32 + 1; b++)
+            {
+                int xid = (a * 32 + G.Camera.X) / 32;
+                int yid = (b * 32 + G.Camera.Y) / 32;
+                int drawX = xid * 32 - G.Camera.X;
+                int drawY = yid * 32 - G.Camera.Y;
+
+                if (xid < G.Map.WidthCount && yid < G.Map.HeightCount && xid >= 0 && yid >= 0)
+                {
+                    int id = G.Map.Layer1[xid][yid];
+                    if (id != -1)
+                        tileset.Draw(_sb, drawX, drawY, 0, 0.5f, 0.5f, 1, 1, 255, 255, 255, 255, id);
+                }
+            }
+    }
+
+    void MoveSelection(int curSelect)
+    {
+        G.MainMenu[G.Prev] = 0;
+        G.MainMenu[curSelect] = 1;
+        G.Prev = curSelect;
+    }
+
+    // ================================================================ spawning
+
+    void SpawnObject(ObjectType type, float xPos, float yPos)
+    {
+        switch (type)
+        {
+            case ObjectType.Fighter:
+                _ = new Enemy(G.Sprites)
+                {
+                    X = xPos, Y = yPos, YVel = 1.5f, Width = 34, Height = 34,
+                    Image = G.Images.IL1[1], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    AI = AI.Normal, Health = 2, HitTimer = 255,
+                };
+                break;
+
+            case ObjectType.Kamikaze:
+                _ = new Enemy(G.Sprites)
+                {
+                    X = xPos, Y = yPos, YVel = 2, Width = 32, Height = 32,
+                    Image = G.Images.IL1[7], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    AI = AI.Hunt, Health = 3, HitTimer = 255,
+                };
+                break;
+
+            case ObjectType.Tactical:
+                _ = new Enemy(G.Sprites)
+                {
+                    X = xPos, Y = yPos, YVel = 3, Charging = false, Width = 32, Height = 32,
+                    Image = G.Images.IL1[15], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    AI = AI.Tactical, Health = 5, HitTimer = 255,
+                };
+                break;
+
+            case ObjectType.Mine:
+                _ = new Enemy(G.Sprites)
+                {
+                    X = xPos, Y = yPos, CenterX = 0.5f, CenterY = 0.5f, YVel = 0.5f,
+                    AnimTicks = 0, ExplodeTime = G.Random(100) + 200, Width = 32, Height = 48,
+                    Image = G.Images.IL1[17], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    Health = 10, AI = AI.Mine, MoveDir = "right",
+                };
+                break;
+
+            case ObjectType.MissileBase:
+                _ = new Enemy(G.Sprites)
+                {
+                    Name = "Missile Base",
+                    X = xPos, Y = yPos, CenterX = 0.5f, CenterY = 0.5f, YVel = 1,
+                    Width = 32, Height = 32,
+                    Image = G.Images.IL1[18], ImageIndex = 1,
+                    DoCollision = false, DoPixelCheck = true,
+                    Health = 1, AI = AI.None,
+                };
+                break;
+
+            case ObjectType.MissileTurret:
+                _ = new Enemy(G.Sprites)
+                {
+                    Name = "Missile Turret",
+                    X = xPos, Y = yPos, YVel = 1, CenterX = 0.5f, CenterY = 0.5f,
+                    Width = 32, Height = 32,
+                    Image = G.Images.IL1[18], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    Health = 4, FireRate = 1, AI = AI.Turret,
+                };
+                break;
+
+            case ObjectType.Scanner:
+                _ = new Enemy(G.Sprites)
+                {
+                    Name = "Scanner",
+                    X = xPos, Y = yPos, YVel = 1, CenterX = 0.5f, CenterY = 0.5f,
+                    Width = 32, Height = 32,
+                    Image = G.Images.IL1[20], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    Health = 10, AI = AI.None,
+                };
+                break;
+
+            case ObjectType.Boss:
+                _ = new Boss(G.Sprites)
+                {
+                    X = xPos, Y = yPos, YVel = 1, Width = 98, Height = 98,
+                    Image = G.Images.IL1[9], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    MoveDir = "right", Health = 50, HitTimer = 255, AI = AI.Boss,
+                };
+                break;
+
+            case ObjectType.Boss2:
+                _ = new Boss(G.Sprites)
+                {
+                    X = xPos, Y = yPos, YVel = 1, Width = 98, Height = 98,
+                    Image = G.Images.IL1[13], ImageIndex = 0,
+                    DoCollision = true, DoPixelCheck = true,
+                    MoveDir = "down", Health = 200, HitTimer = 255, AI = AI.Boss2,
+                    Timer = 0, RandX = 4,
+                };
+                break;
+        }
+    }
+
+    void CreateSquad(ObjectType ship, int pattern)
+    {
+        int randomX = G.Random(G.ScreenWidth - 140) + 64;
+
+        switch (pattern)
+        {
+            case 0:
+                SpawnObject(ship, randomX, -32);
+                SpawnObject(ship, randomX - 32, -64);
+                SpawnObject(ship, randomX + 32, -64);
+                break;
+            case 1:
+                SpawnObject(ship, randomX, -32);
+                SpawnObject(ship, randomX - 32, -64);
+                SpawnObject(ship, randomX + 32, -64);
+                SpawnObject(ship, randomX + 64, -96);
+                SpawnObject(ship, randomX - 64, -96);
+                break;
+        }
+    }
+
+    // ================================================================ states
+
+    void DrawMenu()
+    {
+        PrintFps(10, 10);
+
+        // water background
+        for (int a = 0; a <= G.ScreenWidth / 32; a++)
+            for (int b = 0; b <= G.ScreenHeight / 32; b++)
+                G.Images.IL1[4].Draw(_sb, a * 32, b * 32, 0, 0, 0, 1, 1, 255, 255, 255, 200, 0);
+
+        G.Images.IL2[3].Draw(_sb, G.ScreenWidth / 2 - 180, 50, pattern: 0);
+        G.Images.IL2[4].Draw(_sb, G.ScreenWidth / 2 - 180, 200, pattern: G.MainMenu[4]);
+        G.Images.IL2[5].Draw(_sb, G.ScreenWidth / 2 - 180, 250, pattern: G.MainMenu[3]);
+        G.Images.IL2[6].Draw(_sb, G.ScreenWidth / 2 - 180, 300, pattern: G.MainMenu[2]);
+        G.Images.IL2[7].Draw(_sb, G.ScreenWidth / 2 - 180, 350, pattern: G.MainMenu[1]);
+        G.Images.IL2[8].Draw(_sb, G.ScreenWidth / 2 - 180, 400, pattern: G.MainMenu[0]);
+
+        var versionSize = _font12.MeasureString(G.Version);
+        _sb.DrawString(_font12, G.Version, new Vector2(G.ScreenWidth / 2 - versionSize.X / 2, 100), Color.White);
+
+        if (G.Input.UpClicked)
+        {
+            G.Music.Songs[7].Play();
+            G.CurSelection++;
+            if (G.CurSelection > 4) G.CurSelection = 0;
+            if (G.CurSelection < 0) G.CurSelection = 4;
+            MoveSelection(G.CurSelection);
+        }
+
+        if (G.Input.DownClicked)
+        {
+            G.Music.Songs[7].Play();
+            G.CurSelection--;
+            if (G.CurSelection > 4) G.CurSelection = 0;
+            if (G.CurSelection < 0) G.CurSelection = 4;
+            MoveSelection(G.CurSelection);
+        }
+
+        if (G.Input.Button3Clicked)
+        {
+            switch (G.CurSelection)
+            {
+                case 0:
+                    Exit();
+                    break;
+                case 1:
+                    G.Music.Songs[4].Stop();
+                    G.Music.Songs[9].Play();
+                    G.Sprites.KillAll();
+                    G.Sprites.RemoveDead();
+
+                    G.BitmapFont2.Alpha = 0;
+                    G.Counter = 0;
+                    G.TextNum = 0;
+
+                    G.TitleText = new GameText("DESIGN AND PROGRAMMING", 30, G.BitmapFont2);
+                    G.TitleText.SetSpeed(3);
+                    G.IdText = new GameText("BRIAN BICKNELL", 30, G.BitmapFont2);
+                    G.IdText.SetSpeed(3);
+                    G.State = GameState.Credits;
+                    break;
+                case 2:
+                    G.State = GameState.HighScore;
+                    break;
+                case 3:
+                    G.Music.Songs[8].Play();
+                    break;
+                case 4:
+                    G.Sprites.KillAll();
+                    G.Sprites.RemoveDead();
+                    ResetAll();
+                    G.Level = 1;
+                    G.State = GameState.Intermission;
+                    G.Music.Songs[4].Stop();
+                    G.Music.Songs[7].Play();
+                    break;
+            }
+        }
+
+        if (G.Input.Button6Clicked)   // '2' starts the demo intro
+        {
+            G.Sprites.KillAll();
+            G.Sprites.RemoveDead();
+            ResetAll();
+
+            G.Map.LoadMap("intro.omap");
+            G.Camera.Y = G.Map.HeightCount * 32 - G.ScreenHeight;
+
+            var demoShip = new DemoShip(G.Sprites) { Name = "DemoShip" };
+            demoShip.X = G.ScreenWidth / 2 - demoShip.Width;  // Width still 0, like the original
+            demoShip.Y = G.ScreenHeight;
+            demoShip.Width = 73;
+            demoShip.Height = 45;
+            demoShip.Image = G.Images.IL1[0];
+            demoShip.ImageIndex = 0;
+            demoShip.DoPixelCheck = true;
+            demoShip.DoCollision = true;
+            demoShip.CenterX = 0.5f;
+            demoShip.CenterY = 0.5f;
+            _demoShip = demoShip;
+
+            G.Music.Songs[4].Stop();
+            G.Music.Songs[14].Play();
+
+            G.TitleText = new GameText("BICK SOFTWARE", 30, G.BitmapFont2);
+            G.IdText = new GameText("PRESENTS", 30, G.BitmapFont2);
+            G.TextCreated = false;
+            G.BossMode = false;
+
+            G.State = GameState.Intro;
+        }
+
+        if (G.Input.Button2Clicked)
+            Exit();
+    }
+
+    void DoIntro()
+    {
+        if (_demoShip != null && _demoShip.Y > 300)
+            _demoShip.Y -= 0.2f;
+
+        ClipCamera(G.Camera.X, G.Camera.Y, 32, 32);
+        DrawLayer1();
+
+        PrintFps(10, 20);
+
+        if (!G.TextCreated)
+        {
+            G.TitleText.SetText("BICK SOFTWARE PRESENTS");
+            G.TextCreated = true;
+            G.BitmapFont2.Alpha = 0;
+        }
+
+        if (G.Counter == 5)
+        {
+            G.TitleText.FadeOut(_sb, 200, 200, 500);
+            if (G.BitmapFont2.Alpha == 0)
+            {
+                G.TitleText.SetText("OMEGA SQUADREN");
+                G.Counter = 0;
+            }
+        }
+        else
+        {
+            G.TitleText.FadeIn(_sb, 200, 200, 500);
+            if (G.BitmapFont2.Alpha == 255)
+                G.Counter = 5;
+        }
+
+        if (G.Music.Songs[14].Position > 36)
+        {
+            if (G.Random(50) == 0)
+                SpawnObject(ObjectType.Fighter, G.Random(G.ScreenWidth), -32);
+        }
+
+        if (G.Camera.Y <= 0)
+        {
+            G.Camera.Y = 0;
+            if (!G.BossMode)
+            {
+                SpawnObject(ObjectType.Boss, 300, -G.ScreenHeight + 98);
+                G.BossMode = true;
+            }
+        }
+        else
+            G.Camera.Y--;
+    }
+
+    void DoIntermission()
+    {
+        G.BossMode = false;
+        G.Done = false;
+
+        if (G.Level > 5)
+        {
+            G.Music.Songs[12].Stop();
+            G.Music.Songs[3].Play();
+            G.State = GameState.GameOver;
+        }
+
+        string label = "Level " + G.Level;
+        var size = _font20.MeasureString("Level" + G.Level);
+        _sb.DrawString(_font20, label, new Vector2(G.ScreenWidth / 2 - size.X / 2, G.ScreenHeight / 2), Color.White);
+
+        G.Counter++;
+        G.ShipsKilled = 0;
+
+        if (G.Counter > 500)
+        {
+            switch (G.Level)
+            {
+                case 1: G.Map.LoadMap("test10.omap"); break;
+                case 2: G.Map.LoadMap("test7.omap"); break;
+                case 3: G.Map.LoadMap("test8.omap"); break;
+                case 4: G.Map.LoadMap("bonus.omap"); break;
+                case 5: G.Map.LoadMap("lvl5.omap"); break;
+            }
+
+            G.State = GameState.Playing;
+            ResetPlayer();
+            G.Camera.Y = G.Map.HeightCount * 32 - G.ScreenHeight;
+
+            if (G.Level > 1)
+                G.Music.Songs[G.Level - 2].Stop();
+
+            if (G.Level == 1)
+            {
+                G.Music.Songs[G.MUS_LEVEL1].Volume = 20;
+                G.Music.Songs[G.MUS_LEVEL1].Play();
+            }
+            else if (G.Level == 4)
+                G.Music.Songs[12].Play();
+            else if (G.Level == 5)
+            {
+                G.Music.Songs[12].Stop();
+                G.Music.Songs[4].Play();
+            }
+            else
+                G.Music.Songs[G.Level - 1].Play();
+        }
+    }
+
+    void GameLoop()
+    {
+        ClipCamera(G.Camera.X, G.Camera.Y, 32, 32);
+        DrawLayer1();
+
+        // level 4: boss chase with a wrapping camera
+        if (G.Level == 4)
+        {
+            if (!G.BossMode)
+            {
+                SpawnObject(ObjectType.Boss2, 300, -G.ScreenHeight + 98);
+                G.BossMode = true;
+            }
+
+            if (G.Camera.Y <= 0)
+                G.Camera.Y = G.Map.HeightCount * 32 - G.ScreenHeight;
+            else
+                G.Camera.Y -= 2;
+        }
+
+        int randomNum = G.Random(500);
+        if (randomNum == 0) CreateSquad(ObjectType.Fighter, 0);
+        if (randomNum == 1) CreateSquad(ObjectType.Kamikaze, 1);
+        if (randomNum == 5) SpawnObject(ObjectType.Mine, G.Random(G.ScreenWidth), -48);
+
+        if (G.Camera.Y <= 0)
+        {
+            G.Camera.Y = 0;
+            if (!G.BossMode)
+            {
+                SpawnObject(ObjectType.Boss, 300, -G.ScreenHeight + 98);
+                G.BossMode = true;
+            }
+        }
+        else
+            G.Camera.Y--;
+
+        GetStats();
+
+        G.Counter++;
+        if (G.Counter > 10)
+        {
+            G.Change++;
+            if (G.Change > 2) G.Change = 0;
+            G.Counter = 0;
+        }
+
+        PrintFps(10, 10);
+        _sb.DrawString(_font12, "Sprites: " + G.Sprites.Count, new Vector2(10, 30), Color.White);
+
+        if (G.Lives < 0)
+        {
+            G.Sprites.KillAll();
+            G.Sprites.RemoveDead();
+            G.Music.Songs[G.Level - 1].Stop();
+            G.State = GameState.GameOver;
+        }
+
+        if (G.Done)
+        {
+            G.Sprites.KillAll();
+            G.ShipsKilled++;
+            G.Level++;
+            G.State = GameState.Stats;
+            G.Counter = 0;
+        }
+
+        // spawn entities from map triggers at/below the camera
+        for (int a = 0; a < G.Map.WidthCount; a++)
+            for (int b = Math.Max(0, G.Camera.Y / 32); b < G.Map.HeightCount; b++)
+            {
+                string? action = G.Map.TriggerActions[a, b];
+                if (action == null) continue;
+
+                int tempX = a * 32;
+                int tempY = b - 128;   // original quirk: tile row minus 128 pixels
+
+                switch (action)
+                {
+                    case "fighter":
+                        SpawnObject(ObjectType.Fighter, tempX, tempY);
+                        G.Map.TriggerActions[a, b] = null;
+                        break;
+                    case "kamikaze":
+                        SpawnObject(ObjectType.Kamikaze, tempX, tempY);
+                        G.Map.TriggerActions[a, b] = null;
+                        break;
+                    case "tactical":
+                        SpawnObject(ObjectType.Tactical, tempX, tempY);
+                        G.Map.TriggerActions[a, b] = null;
+                        break;
+                    case "missileturret":
+                        SpawnObject(ObjectType.MissileTurret, tempX, tempY);
+                        SpawnObject(ObjectType.MissileBase, tempX, tempY);
+                        G.Map.TriggerActions[a, b] = null;
+                        break;
+                    case "scanner":
+                        SpawnObject(ObjectType.Scanner, tempX, tempY);
+                        G.Map.TriggerActions[a, b] = null;
+                        break;
+                }
+            }
+
+        if (G.Input.Button2Clicked)
+        {
+            G.Sprites.KillAll();
+            G.Sprites.RemoveDead();
+            G.Music.Songs[G.Level - 1].Stop();
+            G.Music.Songs[G.MUS_TITLE].Play();
+            G.State = GameState.Idle;
+        }
+    }
+
+    void GetStats()
+    {
+        int imageIdx = G.Player.Weapon switch
+        {
+            Weapon.Reg => 0,
+            Weapon.Super => 1,
+            Weapon.Multi => 2,
+            _ => -1,
+        };
+
+        G.Images.IL3[2].Draw(_sb, 300, 560, pattern: imageIdx);
+
+        int colWidth = -10;
+        for (int i = 0; i < G.Lives; i++)
+        {
+            G.Images.IL1[0].Draw(_sb, G.ScreenWidth - 800 + colWidth, G.ScreenHeight - 50,
+                0, 0.5f, 0.5f, 0.5f, 0.5f, 255, 255, 255, 255, 0);
+            colWidth += 30;
+        }
+
+        G.Images.IL1[6].Draw(_sb, 5, 50, pattern: 0);
+        G.BitmapFont1.Print(_sb, 75, 50, G.Score.ToString());
+
+        G.BitmapFont2.Print(_sb, G.ScreenWidth - 150, G.ScreenHeight - 30, "HEALTH");
+        G.Images.IL3[0].Draw(_sb, G.ScreenWidth - 150, G.ScreenHeight - 20, pattern: 0);
+
+        int barWidth = 0;
+        for (int i = 0; i < G.Player.Health; i++)
+        {
+            G.Images.IL3[1].Draw(_sb, G.ScreenWidth - 148 + barWidth, G.ScreenHeight - 18, pattern: 0);
+            barWidth += 8;
+        }
+
+        G.BitmapFont2.Print(_sb, G.ScreenWidth / 6, G.ScreenHeight - 30, "POWER");
+        G.Images.IL3[0].Draw(_sb, G.ScreenWidth / 6, G.ScreenHeight - 20, pattern: 0);
+
+        int energyWidth = 0;
+        for (int i = 0; i < G.Player.Power; i++)
+        {
+            G.Images.IL3[3].Draw(_sb, G.ScreenWidth / 6 + 2 + energyWidth, G.ScreenHeight - 18,
+                0, 0, 0, 1, 1, 0, 100 + energyWidth, 0, 255, 0);
+            energyWidth += 7;
+        }
+
+        if (G.Player.Health < 0)
+        {
+            G.Player.Kill();
+            G.Lives--;
+            ResetPlayer();
+        }
+    }
+
+    void DoStats()
+    {
+        if (G.Counter > 10 && G.CurCount < G.ShipsKilled)
+        {
+            G.Music.Songs[5].Play();
+            G.CurCount++;
+            G.Counter = 0;
+        }
+
+        if (G.Input.Button1Clicked && G.CurCount != G.ShipsKilled)
+        {
+            G.CurCount = G.ShipsKilled;
+            G.Counter = 0;
+        }
+
+        string text = "Ships Killed: " + G.CurCount;
+        var size = _font12.MeasureString(text);
+        _sb.DrawString(_font12, text, new Vector2(G.ScreenWidth / 2 - size.X / 2, G.ScreenHeight / 2), Color.White);
+
+        G.Counter++;
+        _sb.DrawString(_font12, G.Counter.ToString(), new Vector2(10, 10), Color.White);
+
+        if (G.Counter > 500)
+        {
+            G.Counter = 0;
+            G.CurCount = 0;
+            G.State = GameState.Shop;
+        }
+    }
+
+    void DoShop()
+    {
+        _sb.DrawString(_font12, "This is the blackmarket shop", new Vector2(10, 10), Color.White);
+        _sb.DrawString(_font12, "PRESS [SPACE] TO CONTINUE", new Vector2(10, 550), Color.White);
+
+        if (G.Input.Button1Clicked)
+        {
+            G.State = GameState.Intermission;
+            G.Music.Songs[G.Level - 2].Stop();
+            G.Music.Songs[7].Play();
+        }
+    }
+
+    void DoGameOver()
+    {
+        G.Images.IL2[2].Draw(_sb, G.ScreenWidth / 2 - 49, G.ScreenHeight / 2, pattern: 0);
+        G.Images.IL1[6].Draw(_sb, G.ScreenWidth / 2 - 34, G.ScreenHeight / 2 + 100, pattern: 0);
+        G.BitmapFont1.Print(_sb, G.ScreenWidth / 2 + 30, G.ScreenHeight / 2 + 100, G.Score.ToString());
+
+        if (G.Input.Button1Clicked)
+        {
+            G.Music.Songs[3].Stop();
+            G.Music.Songs[9].Play();
+
+            G.BitmapFont2.Alpha = 0;
+            G.Counter = 0;
+            G.TextNum = 0;
+
+            G.TitleText = new GameText("DESIGN AND PROGRAMMING", 30, G.BitmapFont2);
+            G.TitleText.SetSpeed(3);
+            G.IdText = new GameText("BRIAN BICKNELL", 30, G.BitmapFont2);
+            G.IdText.SetSpeed(3);
+
+            if (G.HighScores.Qualifies(G.Score))
+            {
+                _enteredName = "";
+                G.State = GameState.EnterName;   // replaces the Form2 dialog
+            }
+            else
+                G.State = GameState.Credits;
+        }
+    }
+
+    void DoCredits()
+    {
+        G.TitleText.FadeIn(_sb,
+            G.ScreenWidth / 2 - G.TitleText.GetText().Length * G.BitmapFont2.CharWidth / 2,
+            G.ScreenHeight / 2 - 15, 5);
+
+        if (G.TitleText.IsDone)
+            G.IdText.TypePrint(_sb,
+                G.ScreenWidth / 2 - G.IdText.GetText().Length * G.BitmapFont2.CharWidth / 2,
+                G.ScreenHeight / 2 + 15);
+
+        if (G.IdText.IsDone)
+        {
+            G.Counter++;
+            if (G.Counter > 400)
+            {
+                G.TextNum++;
+                switch (G.TextNum)
+                {
+                    case 1:
+                        G.BitmapFont2.Alpha = 0;
+                        G.TitleText.SetText("GRAPHICS BY");
+                        G.IdText.SetText("BRIAN MAZUROWSKI");
+                        break;
+                    case 2:
+                        G.BitmapFont2.Alpha = 0;
+                        G.TitleText.SetText("MUSIC BY");
+                        G.IdText.SetText("ADAM HAIRE");
+                        break;
+                    case 3:
+                        G.BitmapFont2.Alpha = 0;
+                        G.TitleText.SetText("SPECIAL THANKS TO");
+                        G.IdText.SetText("THE OMEGA TEAM");
+                        break;
+                    case 4:
+                        G.BitmapFont2.Alpha = 0;
+                        G.TitleText.SetText("THANK YOU FROM");
+                        G.IdText.SetText("BICK SOFTWARE");
+                        break;
+                    case 5:
+                        G.State = GameState.HighScore;
+                        break;
+                }
+                G.Counter = 0;
+            }
+        }
+
+        if (G.Input.Button2Clicked)
+        {
+            G.Music.Songs[9].Stop();
+            G.Music.Songs[G.MUS_TITLE].Play();
+            G.State = GameState.Idle;
+        }
+    }
+
+    void DoHighScore()
+    {
+        // The original printed via OmegaBitmapFont3, which had no image list assigned;
+        // here the letter and number fonts are combined so the table is actually visible.
+        int delta = 0;
+        int savedAlpha = G.BitmapFont2.Alpha;
+        G.BitmapFont2.Alpha = 255;
+        for (int i = 0; i < 10; i++)
+        {
+            G.BitmapFont2.Print(_sb, 10, 10 + delta, G.HighScores.List[i].Name.ToUpperInvariant());
+            G.BitmapFont1.Print(_sb, 200, 10 + delta, G.HighScores.List[i].Score.ToString());
+            delta += 20;
+        }
+        G.BitmapFont2.Alpha = savedAlpha;
+
+        if (G.Input.Button1Clicked)
+            G.State = GameState.Idle;
+    }
+
+    void DoEnterName()
+    {
+        int savedAlpha = G.BitmapFont2.Alpha;
+        G.BitmapFont2.Alpha = 255;
+        G.BitmapFont2.Print(_sb, 200, 250, "NEW HIGH SCORE");
+        G.BitmapFont2.Print(_sb, 200, 280, "ENTER YOUR NAME");
+        G.BitmapFont2.Print(_sb, 200, 320, _enteredName);
+        G.BitmapFont2.Alpha = savedAlpha;
+
+        foreach (var key in G.Input.Current.GetPressedKeys())
+        {
+            if (!G.Input.Previous.IsKeyUp(key)) continue;
+
+            if (key >= Keys.A && key <= Keys.Z && _enteredName.Length < 20)
+                _enteredName += (char)('A' + (key - Keys.A));
+            else if (key == Keys.Space && _enteredName.Length < 20)
+                _enteredName += ' ';
+            else if (key == Keys.Back && _enteredName.Length > 0)
+                _enteredName = _enteredName[..^1];
+            else if (key == Keys.Enter && _enteredName.Length > 0)
+            {
+                G.HighScores.Enter(_enteredName, G.Score);
+                G.State = GameState.Credits;
+            }
+        }
+    }
+}

FreedomFighter/GameMap.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Port of TOmegaMap, loading the JSON files converted from the .omap format.
+/// Only Layer1 pattern indices and triggers are used by the game.
+/// </summary>
+public class GameMap
+{
+    public int WidthCount;
+    public int HeightCount;
+    public int TileWidth = 32;
+    public int TileHeight = 32;
+    public int[][] Layer1 = [];             // [x][y] -> tileset pattern index, -1 = empty
+    public string?[,] TriggerActions = new string?[0, 0];
+    public OmegaImage? Tileset;
+
+    readonly GraphicsDevice _gd;
+    readonly string _contentDir;
+    readonly Dictionary<string, OmegaImage> _tilesetCache = new();
+
+    public GameMap(GraphicsDevice gd, string contentDir)
+    {
+        _gd = gd;
+        _contentDir = contentDir;
+    }
+
+    record TriggerJson(int x, int y, string name, string action);
+    record MapJson(int widthCount, int heightCount, string oil, int tileWidth, int tileHeight,
+        int[][] layer1, TriggerJson[] triggers);
+
+    public void LoadMap(string mapName)
+    {
+        string path = Path.Combine(_contentDir, "maps", Path.GetFileNameWithoutExtension(mapName) + ".json");
+        var m = JsonSerializer.Deserialize<MapJson>(File.ReadAllText(path))!;
+
+        WidthCount = m.widthCount;
+        HeightCount = m.heightCount;
+        TileWidth = m.tileWidth;
+        TileHeight = m.tileHeight;
+        Layer1 = m.layer1;
+
+        TriggerActions = new string?[WidthCount, HeightCount];
+        foreach (var t in m.triggers)
+            TriggerActions[t.x, t.y] = t.action;
+
+        string tilesetFile = Path.GetFileNameWithoutExtension(m.oil).ToLowerInvariant() + "_00.png";
+        if (!_tilesetCache.TryGetValue(tilesetFile, out var tileset))
+        {
+            tileset = OmegaImage.Load(_gd, Path.Combine(_contentDir, "tilesets", tilesetFile), TileWidth, TileHeight, m.oil);
+            _tilesetCache[tilesetFile] = tileset;
+        }
+        Tileset = tileset;
+    }
+}

FreedomFighter/GameText.cs

@@ -0,0 +1,142 @@
+using System;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Port of TOmegaBitmapFont: a fixed-cell bitmap font backed by an image list item,
+/// with mutable color/alpha state (the credits animate Alpha on the shared font).
+/// </summary>
+public class BitmapFont
+{
+    public string Characters = "";
+    public OmegaImage Image = null!;
+    public int Red = 255, Green = 255, Blue = 255;
+    public int Alpha = 255;
+
+    public int CharWidth => Image.TileWidth;
+    public int CharHeight => Image.TileHeight;
+
+    public BitmapFont(OmegaImage image, string characters)
+    {
+        Image = image;
+        Characters = characters;
+    }
+
+    public void PrintFast(SpriteBatch sb, float x, float y, char c)
+    {
+        int idx = Characters.IndexOf(c);
+        if (idx < 0) return;
+        Image.Draw(sb, x, y, 0, 0, 0, 1, 1, Red, Green, Blue, Math.Clamp(Alpha, 0, 255), idx);
+    }
+
+    public void Print(SpriteBatch sb, float x, float y, string text)
+    {
+        for (int i = 0; i < text.Length; i++)
+            PrintFast(sb, x + i * CharWidth, y, text[i]);
+    }
+}
+
+/// <summary>
+/// Port of the TGameText helper (GameText.pas): typewriter printing and
+/// fade in/out of text through a bitmap font's shared Alpha.
+/// </summary>
+public class GameText
+{
+    string _text;
+    int _length;
+    int _curChar;
+    int _maxLength;
+    int _timer;
+    int _speed = 10;
+    bool _done;
+    readonly BitmapFont _font;
+
+    public GameText(string msg, int rowLength, BitmapFont font)
+    {
+        _text = msg;
+        _length = msg.Length;
+        _maxLength = rowLength;
+        _font = font;
+    }
+
+    public void SetText(string msg)
+    {
+        _text = msg;
+        _length = msg.Length;
+        _curChar = 0;
+        _timer = 0;
+    }
+
+    public void SetSpeed(int speed) => _speed = speed;
+    public bool IsDone => _done;
+    public string GetText() => _text;
+    public int GetLength() => _length * _font.CharWidth;
+
+    // The Pascal original indexed the 1-based string with i = 0..CurChar; index 0 was a no-op.
+    void PrintChars(SpriteBatch sb, float x, float y, int upTo)
+    {
+        for (int i = 1; i <= upTo && i <= _length; i++)
+        {
+            char c = _text[i - 1];
+            if (i <= _maxLength)
+                _font.PrintFast(sb, x + i * _font.CharWidth, y, c);
+            else
+            {
+                int tempChar = i;
+                while (tempChar > _maxLength) tempChar -= _maxLength;
+                _font.PrintFast(sb, x + tempChar * 12, y + (int)Math.Ceiling(i / (double)_maxLength) * 24 - 24, c);
+            }
+        }
+    }
+
+    public void TypePrint(SpriteBatch sb, float x, float y)
+    {
+        _done = false;
+        PrintChars(sb, x, y, _curChar);
+
+        if (_curChar < _length)
+        {
+            _timer++;
+            if (_timer > _speed)
+            {
+                _curChar++;
+                if (_curChar <= _length && _curChar >= 1 && _text[_curChar - 1] == ' ')
+                    _curChar++;
+                _timer = 0;
+            }
+        }
+        else
+            _done = true;
+    }
+
+    public void FadeIn(SpriteBatch sb, float x, float y, int speed)
+    {
+        _done = false;
+        PrintChars(sb, x, y, _length);
+        _timer++;
+        if (_timer > speed && _font.Alpha < 255)
+            _font.Alpha++;
+        else
+            _done = true;   // original quirk: also "done" while the timer is still counting
+    }
+
+    public void FadeOut(SpriteBatch sb, float x, float y, int speed)
+    {
+        _done = false;
+        PrintChars(sb, x, y, _length);
+        _timer++;
+        if (_timer > speed && _font.Alpha > 0)
+            _font.Alpha--;
+        else
+            _done = true;
+    }
+
+    public void Reset()
+    {
+        _curChar = 0;
+        _timer = 0;
+        _speed = 10;
+        _done = false;
+    }
+}

FreedomFighter/HighScores.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.Json;
+
+namespace FreedomFighter;
+
+public record HighScoreEntry(string Name, int Score);
+
+/// <summary>High score table; JSON replaces the original Highscore.dat record file.</summary>
+public class HighScores
+{
+    const string FileName = "highscore.json";
+    public HighScoreEntry[] List = new HighScoreEntry[10];
+
+    public void Load()
+    {
+        if (File.Exists(FileName))
+        {
+            try
+            {
+                var loaded = JsonSerializer.Deserialize<HighScoreEntry[]>(File.ReadAllText(FileName));
+                if (loaded is { Length: 10 }) { List = loaded; return; }
+            }
+            catch { /* fall through to defaults */ }
+        }
+        for (int i = 0; i < 10; i++)
+            List[i] = new HighScoreEntry("Nameless", 0);
+        Save();
+    }
+
+    public void Save() => File.WriteAllText(FileName, JsonSerializer.Serialize(List));
+
+    public bool Qualifies(int score) => score > List[9].Score;
+
+    public void Add(int num, string name, int score)
+    {
+        for (int i = 9; i >= num + 1; i--)
+            List[i] = List[i - 1];
+        List[num] = new HighScoreEntry(name, score);
+    }
+
+    /// <summary>Port of EnterHighScoreList: insert from the bottom up.</summary>
+    public void Enter(string name, int score)
+    {
+        for (int i = 8; i >= 0; i--)
+        {
+            if (score <= List[i].Score)
+            {
+                Add(i + 1, name, score);
+                break;
+            }
+            if (i == 0)
+            {
+                Add(i, name, score);
+                break;
+            }
+        }
+        Save();
+    }
+}

FreedomFighter/MusicManager.cs

@@ -0,0 +1,114 @@
+using System;
+using System.IO;
+using Microsoft.Xna.Framework.Audio;
+using Microsoft.Xna.Framework.Media;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Replacement for TOmegaMusic: a flat list of "songs" where some entries are
+/// streamed music (mp3 via MediaPlayer) and some are sound effects (wav).
+/// Indices mirror OmegaMusic1.Songs in GameU.dfm.
+/// </summary>
+public class MusicManager
+{
+    public class Entry
+    {
+        readonly MusicManager _mgr;
+        public string Name = "";
+        public Song? Song;              // streamed music
+        public SoundEffect? Effect;     // wav sfx
+        public int Volume = 100;        // 0..100, Omega convention
+
+        public Entry(MusicManager mgr) => _mgr = mgr;
+
+        public void Play()
+        {
+            if (Song != null)
+            {
+                MediaPlayer.Volume = Volume / 100f;
+                MediaPlayer.Play(Song);
+                _mgr._current = this;
+            }
+            else if (Effect != null)
+            {
+                Effect.Play(Volume / 100f, 0, 0);
+                Volume = 100;   // one-shot volume, like the original's per-play setting
+            }
+        }
+
+        public void Stop()
+        {
+            if (Song != null && _mgr._current == this)
+            {
+                MediaPlayer.Stop();
+                _mgr._current = null;
+            }
+        }
+
+        /// <summary>Playback position in seconds (original used this in the intro).</summary>
+        public double Position => Song != null && _mgr._current == this
+            ? MediaPlayer.PlayPosition.TotalSeconds : 0;
+    }
+
+    Entry? _current;
+    public Entry[] Songs = [];
+
+    public void Load(string contentDir)
+    {
+        MediaPlayer.IsRepeating = true;   // OmegaMusic1.Loop was called every menu frame
+
+        // Index order mirrors OmegaMusic1.Songs in GameU.dfm.
+        // [1] 'Level test.mp3' is lost — Track06.mp3 substitutes.
+        // [3] gameover was a MIDI (Nazi_Rap.mid); MonoGame has no MIDI playback, so it is silent.
+        (string name, string? file)[] entries =
+        [
+            ("level1", @"music\white light.mp3"),
+            ("level2", @"music\Track06.mp3"),
+            ("level3", @"music\G2 Final.mp3"),
+            ("gameover", null),
+            ("title", @"music\Main Menu 2.mp3"),
+            ("fire1", @"sfx\fire1.wav"),
+            ("reload", @"sfx\reload.wav"),
+            ("thump", @"sfx\thump1.wav"),
+            ("beep", @"sfx\beep.wav"),
+            ("credits", @"music\G8 Final.mp3"),
+            ("hit", @"sfx\hit4.wav"),
+            ("explosion", @"sfx\explode2.wav"),
+            ("level4", @"music\Thunderization.mp3"),
+            ("missile", @"sfx\missile.wav"),
+            ("intro", @"music\Intro.mp3"),
+        ];
+
+        Songs = new Entry[entries.Length];
+        for (int i = 0; i < entries.Length; i++)
+        {
+            var e = new Entry(this) { Name = entries[i].name };
+            var file = entries[i].file;
+            if (file != null)
+            {
+                string path = Path.Combine(contentDir, file);
+                if (File.Exists(path))
+                {
+                    try
+                    {
+                        if (path.EndsWith(".wav", StringComparison.OrdinalIgnoreCase))
+                        {
+                            using var fs = File.OpenRead(path);
+                            e.Effect = SoundEffect.FromStream(fs);
+                        }
+                        else
+                        {
+                            e.Song = Song.FromUri(entries[i].name, new Uri(path, UriKind.Absolute));
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"Audio load failed for {file}: {ex.Message}");
+                    }
+                }
+            }
+            Songs[i] = e;
+        }
+    }
+}

FreedomFighter/OmegaImage.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Equivalent of a TOmegaImageList item: a texture subdivided into equally-sized
+/// patterns (frames), drawn by pattern index. Also builds alpha masks for
+/// pixel-perfect collision (Omega's DoPixelCheck).
+/// </summary>
+public class OmegaImage
+{
+    public string Name = "";
+    public Texture2D Texture = null!;
+    public int TileWidth;
+    public int TileHeight;
+    public int Columns;
+    public int PatternCount;
+    public bool[] OpaqueMask = null!;   // per-pixel alpha>0, whole texture, row-major
+
+    public static OmegaImage Load(GraphicsDevice gd, string file, int tileW, int tileH, string name)
+    {
+        using var fs = File.OpenRead(file);
+        var tex = Texture2D.FromStream(gd, fs);
+        int tw = tileW > 0 ? tileW : tex.Width;
+        int th = tileH > 0 ? tileH : tex.Height;
+
+        var pixels = new Color[tex.Width * tex.Height];
+        tex.GetData(pixels);
+        var mask = new bool[pixels.Length];
+        for (int i = 0; i < pixels.Length; i++)
+            mask[i] = pixels[i].A > 0;
+
+        return new OmegaImage
+        {
+            Name = name,
+            Texture = tex,
+            TileWidth = tw,
+            TileHeight = th,
+            Columns = Math.Max(1, tex.Width / tw),
+            PatternCount = Math.Max(1, tex.Width / tw) * Math.Max(1, tex.Height / th),
+            OpaqueMask = mask,
+        };
+    }
+
+    public Rectangle PatternRect(int pattern)
+    {
+        if (pattern < 0 || pattern >= PatternCount) pattern = 0;
+        return new Rectangle(pattern % Columns * TileWidth, pattern / Columns * TileHeight, TileWidth, TileHeight);
+    }
+
+    /// <summary>Is the pixel at (px,py) within the given pattern opaque? Coordinates are pattern-local.</summary>
+    public bool IsOpaque(int pattern, int px, int py)
+    {
+        if (px < 0 || py < 0 || px >= TileWidth || py >= TileHeight) return false;
+        var r = PatternRect(pattern);
+        int x = r.X + px, y = r.Y + py;
+        if (x >= Texture.Width || y >= Texture.Height) return false;
+        return OpaqueMask[y * Texture.Width + x];
+    }
+
+    /// <summary>
+    /// Full Omega draw. X,Y is the top-left of the pattern; rotation (degrees, clockwise)
+    /// pivots around (centerX, centerY) as a fraction of the pattern size.
+    /// </summary>
+    public void Draw(SpriteBatch sb, float x, float y, float rotation = 0,
+        float centerX = 0, float centerY = 0, float scaleX = 1, float scaleY = 1,
+        int red = 255, int green = 255, int blue = 255, int alpha = 255, int pattern = 0)
+    {
+        var src = PatternRect(pattern);
+        var origin = new Vector2(centerX * TileWidth, centerY * TileHeight);
+        var pos = new Vector2(x + origin.X * scaleX, y + origin.Y * scaleY);
+        var color = new Color(red, green, blue, alpha);
+        sb.Draw(Texture, pos, src, color, MathHelper.ToRadians(rotation), origin,
+            new Vector2(scaleX, scaleY), SpriteEffects.None, 0);
+    }
+}
+
+/// <summary>Loads the image lists extracted from GameU.dfm via gfx/manifest.json.</summary>
+public class ImageLists
+{
+    readonly Dictionary<string, List<OmegaImage>> _lists = new();
+
+    public List<OmegaImage> IL1 => _lists["OmegaImageList1"];
+    public List<OmegaImage> IL2 => _lists["OmegaImageList2"];
+    public List<OmegaImage> IL3 => _lists["OmegaImageList3"];
+    public List<OmegaImage> IL4 => _lists["OmegaImageList4"];
+    public List<OmegaImage> IL5 => _lists["OmegaImageList5"];
+
+    record ManifestItem(int Index, string Name, string File, int TileWidth, int TileHeight);
+
+    public ImageLists(GraphicsDevice gd, string contentDir)
+    {
+        string gfxDir = Path.Combine(contentDir, "gfx");
+        var manifest = JsonSerializer.Deserialize<Dictionary<string, List<ManifestItem>>>(
+            File.ReadAllText(Path.Combine(gfxDir, "manifest.json")))!;
+
+        foreach (var (listName, items) in manifest)
+        {
+            var list = new List<OmegaImage>();
+            foreach (var item in items)
+                list.Add(OmegaImage.Load(gd, Path.Combine(gfxDir, item.File), item.TileWidth, item.TileHeight, item.Name));
+            _lists[listName] = list;
+        }
+    }
+}

FreedomFighter/OmegaInput.cs

@@ -0,0 +1,43 @@
+using Microsoft.Xna.Framework.Input;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Replacement for TOmegaInput's keyboard state sets, with the key assignments
+/// from GameU.dfm: B1=Space, B2=Esc, B3=Enter, B4=RCtrl, B5=1, B6=2, B7=3, B8=M.
+/// "States" = held; "StatesClicked" = pressed this frame.
+/// </summary>
+public class OmegaInput
+{
+    KeyboardState _prev;
+    KeyboardState _cur;
+
+    public void Update()
+    {
+        _prev = _cur;
+        _cur = Keyboard.GetState();
+    }
+
+    bool Held(Keys k) => _cur.IsKeyDown(k);
+    bool Clicked(Keys k) => _cur.IsKeyDown(k) && _prev.IsKeyUp(k);
+
+    public bool Up => Held(Keys.Up);
+    public bool Down => Held(Keys.Down);
+    public bool Left => Held(Keys.Left);
+    public bool Right => Held(Keys.Right);
+    public bool Button4 => Held(Keys.RightControl) || Held(Keys.LeftControl);
+    public bool Button8 => Held(Keys.M);
+
+    public bool UpClicked => Clicked(Keys.Up);
+    public bool DownClicked => Clicked(Keys.Down);
+    public bool Button1Clicked => Clicked(Keys.Space);
+    public bool Button2Clicked => Clicked(Keys.Escape);
+    public bool Button3Clicked => Clicked(Keys.Enter);
+    public bool Button5Clicked => Clicked(Keys.D1) || Clicked(Keys.NumPad1);
+    public bool Button6Clicked => Clicked(Keys.D2) || Clicked(Keys.NumPad2);
+    public bool Button7Clicked => Clicked(Keys.D3) || Clicked(Keys.NumPad3);
+    public bool PauseClicked => Clicked(Keys.Pause);
+
+    public KeyboardState Current => _cur;
+    public KeyboardState Previous => _prev;
+}

FreedomFighter/Program.cs

@@ -0,0 +1,17 @@
+using System;
+
+using var game = new FreedomFighter.Game1();
+// debug aid: --shot <file> [frames] renders, saves the backbuffer to a PNG, and exits
+var cmdArgs = Environment.GetCommandLineArgs();
+for (int i = 1; i < cmdArgs.Length - 1; i++)
+{
+    if (cmdArgs[i] == "--shot")
+    {
+        game.ShotFile = cmdArgs[i + 1];
+        if (i + 2 < cmdArgs.Length && int.TryParse(cmdArgs[i + 2], out int frames))
+            game.ShotFrames = frames;
+    }
+    if (cmdArgs[i] == "--level" && int.TryParse(cmdArgs[i + 1], out int level))
+        game.StartLevel = level;
+}
+game.Run();

FreedomFighter/Sprites.cs

@@ -0,0 +1,120 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Port of the Omega TSprite base class. Position is the pattern's top-left;
+/// CenterX/CenterY only affect the rotation pivot. Width/Height define the
+/// logical collision box, independent of the drawn pattern size.
+/// </summary>
+public abstract class Sprite
+{
+    public string Name = "";
+    public float X, Y;
+    public int Width, Height;
+    public float Rotation;              // degrees
+    public float CenterX, CenterY;      // 0..1 fraction of pattern
+    public float ScaleX = 1, ScaleY = 1;
+    public int Red = 255, Green = 255, Blue = 255, Alpha = 255;
+    public OmegaImage? Image;
+    public int ImageIndex;
+    public bool DoCollision;
+    public bool DoPixelCheck;
+    public bool IsDead;
+
+    protected Sprite(SpriteManager manager) => manager.Add(this);
+
+    public void SetGreen(int v) => Green = Math.Clamp(v, 0, 255);
+    public void SetBlue(int v) => Blue = Math.Clamp(v, 0, 255);
+
+    /// <summary>Marks the sprite for removal (Omega's Dead).</summary>
+    public void Kill() => IsDead = true;
+
+    public virtual void Move(float moveCount) { }
+
+    public virtual void Draw(SpriteBatch sb)
+    {
+        Image?.Draw(sb, (int)Math.Round(X), (int)Math.Round(Y), Rotation,
+            CenterX, CenterY, ScaleX, ScaleY, Red, Green, Blue, Alpha, ImageIndex);
+    }
+
+    public virtual void OnCollision(Sprite sprite, int colX, int colY) { }
+
+    public Rectangle Bounds => new((int)X, (int)Y, Width, Height);
+}
+
+/// <summary>
+/// Port of TOmegaSprite: owns all sprites, runs movement, collision
+/// (bounding box + optional pixel check), removal, and drawing.
+/// </summary>
+public class SpriteManager
+{
+    public readonly List<Sprite> Items = new();
+
+    public int Count => Items.Count;
+
+    public void Add(Sprite s) => Items.Add(s);
+
+    public void KillAll()
+    {
+        foreach (var s in Items) s.Kill();
+    }
+
+    public void Move(float moveCount)
+    {
+        // like the Pascal for-loop, sprites spawned during iteration are not moved this frame
+        int n = Items.Count;
+        for (int i = 0; i < n; i++)
+            Items[i].Move(moveCount);
+    }
+
+    public void Collision()
+    {
+        int n = Items.Count;
+        for (int i = 0; i < n; i++)
+        {
+            var a = Items[i];
+            if (!a.DoCollision || a.IsDead) continue;
+            for (int j = i + 1; j < n; j++)
+            {
+                var b = Items[j];
+                if (!b.DoCollision || b.IsDead) continue;
+
+                var overlap = Rectangle.Intersect(a.Bounds, b.Bounds);
+                if (overlap.IsEmpty) continue;
+
+                if ((a.DoPixelCheck || b.DoPixelCheck) && !PixelOverlap(a, b, overlap)) continue;
+
+                a.OnCollision(b, overlap.X, overlap.Y);
+                b.OnCollision(a, overlap.X, overlap.Y);
+            }
+        }
+    }
+
+    /// <summary>Pixel test on the unrotated pattern masks (rotation ignored, like a cheap approximation).</summary>
+    static bool PixelOverlap(Sprite a, Sprite b, Rectangle overlap)
+    {
+        if (a.Image == null || b.Image == null) return true;
+        for (int y = overlap.Top; y < overlap.Bottom; y++)
+            for (int x = overlap.Left; x < overlap.Right; x++)
+            {
+                bool pa = a.Image.IsOpaque(a.ImageIndex, x - (int)a.X, y - (int)a.Y);
+                bool pb = b.Image.IsOpaque(b.ImageIndex, x - (int)b.X, y - (int)b.Y);
+                if (pa && pb) return true;
+            }
+        return false;
+    }
+
+    public void RemoveDead() => Items.RemoveAll(s => s.IsDead);
+
+    public void Draw(SpriteBatch sb)
+    {
+        int n = Items.Count;
+        for (int i = 0; i < n; i++)
+            if (!Items[i].IsDead)
+                Items[i].Draw(sb);
+    }
+}

FreedomFighter/app.manifest

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="FreedomFighter"/>
+  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
+    <security>
+      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
+        <requestedExecutionLevel  level="asInvoker" uiAccess="false" />
+      </requestedPrivileges>
+    </security>
+  </trustInfo>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on and is
+           is designed to work with. Uncomment the appropriate elements and Windows will 
+           automatically selected the most compatible environment. -->
+
+      <!-- Windows Vista -->
+      <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}" />
+
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />
+
+      <!-- Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}" />
+
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+
+    </application>
+  </compatibility>
+
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">permonitorv2,permonitor</dpiAwareness>
+    </windowsSettings>
+  </application>
+
+</assembly>