add background

libs/tiled/src/layer.zig

@@ -136,6 +136,7 @@ pub const TileVariant = struct {
                 const encoded_tiles = try lexer.nextExpectText();
                 const tiles = try parseEncoding(encoding, scratch.allocator(), encoded_tiles);
                 try temp_tiles.appendSlice(scratch.allocator(), tiles.items);
+                continue;
 
             } else if (node.isTag("chunk")) {
                 const chunk = try initChunkDataFromXml(arena, scratch, lexer, encoding);
@@ -158,7 +159,6 @@ pub const TileVariant = struct {
                 .fixed = try arena.dupe(u32, temp_tiles.items)
             };
         }
-
     }
 
     fn parseEncoding(

libs/tiled/src/tilemap.zig

@@ -73,6 +73,9 @@ pub const TilesetReference = struct {
 pub const Tile = struct {
     tileset: *const Tileset,
     id: u32,
+    flip_horizontal: bool,
+    flip_vertical: bool,
+    flip_diagonal: bool,
 
     pub fn getProperties(self: Tile) Property.List {
         return self.tileset.getTileProperties(self.id) orelse .empty;
@@ -216,13 +219,19 @@ fn getTilesetByGid(self: *const Tilemap, gid: u32) ?TilesetReference {
 }
 
 pub fn getTile(self: *const Tilemap, tilesets: Tileset.List, gid: u32) ?Tile {
-    const tileset_ref = self.getTilesetByGid(gid & GlobalTileId.Flag.clear) orelse return null;
+    const Flag = GlobalTileId.Flag;
+
+    const gid_without_flags = gid & Flag.clear;
+    const tileset_ref = self.getTilesetByGid(gid_without_flags) orelse return null;
     const tileset = tilesets.get(tileset_ref.source) orelse return null;
-    const id = gid - tileset_ref.first_gid;
+    const id = gid_without_flags - tileset_ref.first_gid;
 
     return Tile{
         .tileset = tileset,
-        .id = id
+        .id = id,
+        .flip_horizontal = (gid & @intFromEnum(Flag.flipped_horizontally)) > 0,
+        .flip_vertical = (gid & @intFromEnum(Flag.flipped_vertically)) > 0,
+        .flip_diagonal = (gid & @intFromEnum(Flag.flipped_diagonally)) > 0
     };
 }
 

src/assets.zig

@@ -24,7 +24,6 @@ pub const Tilemap = struct {
     texture: Gfx.TextureId,
     tile_size: Engine.Vec2,
 
-
     pub fn getTileUV(self: Tilemap, tile_x: f32, tile_y: f32) Rect {
         const texture_info = Engine.Graphics.getTextureInfo(self.texture);
         const tilemap_size = Vec2.initFromInt(u32, texture_info.width, texture_info.height);
@@ -39,14 +38,17 @@ pub const Tilemap = struct {
 arena: std.heap.ArenaAllocator,
 
 font_id: FontName.EnumArray,
-wood01: Audio.Data.Id,
+pistol_mask: Gfx.TextureId,
+bomb_mask: Gfx.TextureId,
+laser_mask: Gfx.TextureId,
+dungeon_tilemap: Tilemap,
+
+skeleton: Gfx.Sprite,
+snake: Gfx.Sprite,
+fire_spirit: Gfx.Sprite,
+
 map: tiled.Tilemap,
 tilesets: tiled.Tileset.List,
-move_sound: []Audio.Data.Id,
-
-terrain_tilemap: Tilemap,
-players_tilemap: Tilemap,
-weapons_tilemap: Tilemap,
 
 pub fn init(gpa: std.mem.Allocator) !Assets {
     var arena = std.heap.ArenaAllocator.init(gpa);
@@ -58,11 +60,83 @@ pub fn init(gpa: std.mem.Allocator) !Assets {
         .italic = try Gfx.addFont("italic", @embedFile("assets/roboto-font/Roboto-Italic.ttf")),
     });
 
-    const wood01 = try Audio.load(.{
+    const pistol_mask_image = try STBImage.load(@embedFile("assets/pistol-mask.png"));
-        .format = .vorbis,
+    defer pistol_mask_image.deinit();
-        .data = @embedFile("assets/wood01.ogg"),
+    const pistol_mask_texture = try Gfx.addTexture(&.{
+        .{
+            .width = pistol_mask_image.width,
+            .height = pistol_mask_image.height,
+            .rgba = pistol_mask_image.rgba8_pixels
+        }
     });
 
+    const bomb_mask_image = try STBImage.load(@embedFile("assets/bomb-mask.png"));
+    defer bomb_mask_image.deinit();
+    const bomb_mask_texture = try Gfx.addTexture(&.{
+        .{
+            .width = bomb_mask_image.width,
+            .height = bomb_mask_image.height,
+            .rgba = bomb_mask_image.rgba8_pixels
+        }
+    });
+
+    const laser_mask_image = try STBImage.load(@embedFile("assets/laser-mask.png"));
+    defer laser_mask_image.deinit();
+    const laser_mask_texture = try Gfx.addTexture(&.{
+        .{
+            .width = laser_mask_image.width,
+            .height = laser_mask_image.height,
+            .rgba = laser_mask_image.rgba8_pixels
+        }
+    });
+
+    const creatures_image = try STBImage.load(@embedFile("assets/tiny-creatures/tilemap_packed.png"));
+    defer creatures_image.deinit();
+    const creatures_texture = try Gfx.addTexture(&.{
+        .{
+            .width = creatures_image.width,
+            .height = creatures_image.height,
+            .rgba = creatures_image.rgba8_pixels
+        }
+    });
+
+    const snake_image = try STBImage.load(@embedFile("assets/snake.png"));
+    defer snake_image.deinit();
+    const snake_texture = try Gfx.addTexture(&.{
+        .{
+            .width = snake_image.width,
+            .height = snake_image.height,
+            .rgba = snake_image.rgba8_pixels
+        }
+    });
+
+    const fire_spirit_image = try STBImage.load(@embedFile("assets/fire-spirit.png"));
+    defer fire_spirit_image.deinit();
+    const fire_spirit_texture = try Gfx.addTexture(&.{
+        .{
+            .width = fire_spirit_image.width,
+            .height = fire_spirit_image.height,
+            .rgba = fire_spirit_image.rgba8_pixels
+        }
+    });
+
+    const creatures_tilemap = Tilemap{
+        .texture = creatures_texture,
+        .tile_size = .init(16, 16)
+    };
+    const snake = Gfx.Sprite{
+        .texture = snake_texture,
+        .uv = .unit
+    };
+    const skeleton = Gfx.Sprite{
+        .texture = creatures_texture,
+        .uv = creatures_tilemap.getTileUV(1, 0)
+    };
+    const fire_spirit = Gfx.Sprite{
+        .texture = fire_spirit_texture,
+        .uv = .unit
+    };
+
     var scratch = std.heap.ArenaAllocator.init(gpa);
     defer scratch.deinit();
 
@@ -80,76 +154,42 @@ pub fn init(gpa: std.mem.Allocator) !Assets {
         gpa,
         &scratch,
         &xml_buffers,
-        @embedFile("assets/tileset.tsx")
+        @embedFile("assets/dungeon.tsx")
     );
 
     var tilesets: tiled.Tileset.List = .empty;
-    try tilesets.add(gpa, "tilemap.tsx", tileset);
+    try tilesets.add(gpa, "dungeon.tsx", tileset);
 
-    const players_image = try STBImage.load(@embedFile("assets/kenney_desert-shooter-pack_1.0/PNG/Players/tilemap_packed.png"));
+    const dungeon_image = try STBImage.load(@embedFile("assets/tiny-dungeon/tilemap_packed.png"));
-    defer players_image.deinit();
+    defer dungeon_image.deinit();
-    const players_texture = try Gfx.addTexture(&.{
+    const dungeon_texture = try Gfx.addTexture(&.{
         .{
-            .width = players_image.width,
+            .width = dungeon_image.width,
-            .height = players_image.height,
+            .height = dungeon_image.height,
-            .rgba = players_image.rgba8_pixels
+            .rgba = dungeon_image.rgba8_pixels
         }
     });
 
-    const tileset_image = try STBImage.load(@embedFile("assets/kenney_desert-shooter-pack_1.0/PNG/Tiles/tilemap_packed.png"));
-    defer tileset_image.deinit();
-    const tileset_texture = try Gfx.addTexture(&.{
-        .{
-            .width = tileset_image.width,
-            .height = tileset_image.height,
-            .rgba = tileset_image.rgba8_pixels
-        }
-    });
-
-    const weapons_tileset = try STBImage.load(@embedFile("assets/kenney_desert-shooter-pack_1.0/PNG/Weapons/tilemap_packed.png"));
-    defer weapons_tileset.deinit();
-    const weapons_texture = try Gfx.addTexture(&.{
-        .{
-            .width = weapons_tileset.width,
-            .height = weapons_tileset.height,
-            .rgba = weapons_tileset.rgba8_pixels
-        }
-    });
-
-    const move_c = try Audio.load(.{
-        .data = @embedFile("assets/kenney_desert-shooter-pack_1.0/Sounds/move-c.ogg"),
-        .format = .vorbis,
-    });
-    const move_d = try Audio.load(.{
-        .data = @embedFile("assets/kenney_desert-shooter-pack_1.0/Sounds/move-d.ogg"),
-        .format = .vorbis,
-    });
-    const move_sound = try arena.allocator().dupe(Audio.Data.Id, &.{ move_c, move_d });
-
     return Assets{
         .arena = arena,
         .font_id = font_id_array,
-        .wood01 = wood01,
+        .pistol_mask = pistol_mask_texture,
+        .bomb_mask = bomb_mask_texture,
+        .laser_mask = laser_mask_texture,
+        .snake = snake,
+        .skeleton = skeleton,
+        .fire_spirit = fire_spirit,
         .map = map,
         .tilesets = tilesets,
-        .move_sound = move_sound,
+        .dungeon_tilemap = .{
-        .terrain_tilemap = .{
+            .texture = dungeon_texture,
-            .texture = tileset_texture,
+            .tile_size = .init(16, 16)
-            .tile_size = .initFromInt(u32, tileset.tile_width, tileset.tile_height)
+        }
-        },
-        .players_tilemap = .{
-            .texture = players_texture,
-            .tile_size = .init(24, 24)
-        },
-        .weapons_tilemap = .{
-            .texture = weapons_texture,
-            .tile_size = .init(24, 24)
-        },
     };
 }
 
 pub fn deinit(self: *Assets, gpa: std.mem.Allocator) void {
-    self.map.deinit();
     self.tilesets.deinit(gpa);
+    self.map.deinit();
     self.arena.deinit();
 }

src/assets/dungeon.tsx

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tileset version="1.10" tiledversion="1.11.2" name="dungeon" tilewidth="16" tileheight="16" tilecount="132" columns="12">
+ <image source="tiny-dungeon/tilemap_packed.png" width="192" height="176"/>
+</tileset>

src/assets/game.tiled-project

@@ -0,0 +1,14 @@
+{
+    "automappingRulesFile": "",
+    "commands": [
+    ],
+    "compatibilityVersion": 1100,
+    "extensionsPath": "extensions",
+    "folders": [
+        "."
+    ],
+    "properties": [
+    ],
+    "propertyTypes": [
+    ]
+}

src/assets/map.tmx

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<map version="1.10" tiledversion="1.11.2" orientation="orthogonal" renderorder="right-down" width="20" height="15" tilewidth="16" tileheight="16" infinite="0" nextlayerid="2" nextobjectid="1">
+ <tileset firstgid="1" source="dungeon.tsx"/>
+ <layer id="1" name="Tile Layer 1" width="20" height="15">
+  <data encoding="csv">
+2147483701,51,51,51,52,52,51,51,51,51,51,52,52,52,51,51,51,51,51,53,
+536870963,49,49,49,49,49,49,49,49,50,50,50,50,50,49,49,49,49,49,2684354611,
+1610612788,49,43,43,49,49,49,49,49,50,50,50,50,50,49,49,43,43,49,2684354611,
+1610612788,49,43,43,49,49,50,49,49,49,50,50,50,50,49,49,43,43,50,2684354611,
+1610612788,50,50,49,49,49,50,50,49,49,49,49,49,49,49,49,49,50,50,3758096436,
+1610612788,49,49,49,49,49,49,49,49,49,49,49,49,49,49,49,49,49,50,3758096436,
+1610612788,49,49,49,49,49,49,50,50,50,50,49,49,50,49,49,49,49,49,3758096436,
+536870963,49,49,49,49,49,49,49,50,50,50,50,50,50,49,49,49,49,49,2684354611,
+536870963,49,50,50,49,49,49,49,49,49,50,50,50,50,49,49,49,50,50,3758096436,
+536870963,49,50,50,49,49,49,49,49,49,49,49,49,49,49,49,50,50,50,3758096436,
+1610612788,50,50,49,49,49,49,50,50,49,49,49,49,49,49,50,50,50,49,2684354611,
+1610612788,49,43,43,49,49,50,50,50,50,50,49,49,49,49,50,43,43,49,2684354611,
+536870963,49,43,43,49,50,50,50,49,49,49,49,49,49,49,50,43,43,49,3758096436,
+536870963,49,49,49,49,50,50,49,49,49,49,49,49,49,49,49,49,49,49,2684354611,
+3221225525,1073741875,1073741875,1073741875,1073741875,1073741876,1073741876,1073741875,1073741875,1073741875,1073741875,1073741875,1073741875,1073741876,1073741876,1073741875,1073741875,1073741875,1073741876,1073741877
+</data>
+ </layer>
+</map>

src/assets/tiny-dungeon/License.txt

@@ -0,0 +1,22 @@
+	
+
+	Tiny Dungeon (1.0)
+
+	Created/distributed by Kenney (www.kenney.nl)
+	Creation date: 05-07-2022
+
+			------------------------------
+
+	License: (Creative Commons Zero, CC0)
+	http://creativecommons.org/publicdomain/zero/1.0/
+
+	This content is free to use in personal, educational and commercial projects.
+	Support us by crediting Kenney or www.kenney.nl (this is not mandatory)
+
+			------------------------------
+
+	Donate:   http://support.kenney.nl
+	Patreon:  http://patreon.com/kenney/
+
+	Follow on Twitter for updates:
+	http://twitter.com/KenneyNL

src/assets/tiny-dungeon/Tilesheet.txt

@@ -0,0 +1,9 @@
+Tilesheet information:
+
+Tile size                 •  16px × 16px
+Space between tiles       •  1px × 1px
+---
+Total tiles (horizontal)  •  12 tiles
+Total tiles (vertical)    •  11 tiles
+---
+Total tiles in sheet      •  132 tiles

src/combat_screen.zig

@@ -10,6 +10,7 @@ const GenerationalArrayList = @import("./generational_array_list.zig").Generatio
 const Engine = @import("./engine/root.zig");
 const Nanoseconds = Engine.Nanoseconds;
 const Vec2 = Engine.Vec2;
+const Sprite = Engine.Graphics.Sprite;
 const Line = Engine.Math.Line;
 const Rect = Engine.Math.Rect;
 const Range = Engine.Math.Range;
@@ -55,10 +56,11 @@ const Player = struct {
     max_health: u32 = 0,
     last_shot_at: ?Nanoseconds = null,
     invincible_until: ?Nanoseconds = null,
-    gun: ?Gun = null,
+    gun: Gun = .pistol,
 
     pub fn getRect(self: Player) Rect {
-        return getCenteredRect(self.kinetic.pos, 16);
+        const pos = self.kinetic.pos;
+        return Rect.initCentered(pos.x, pos.y, 16, 24);
     }
 };
 
@@ -90,6 +92,8 @@ const Enemy = struct {
     kinetic: Kinetic,
     speed: f32,
     size: f32,
+    sprite: Sprite,
+
     target: ?Vec2 = null,
     distance_to_target: ?f32 = null,
 
@@ -147,18 +151,8 @@ const Wave = struct {
     };
 };
 
-const Pickup = struct {
-    const Kind = enum {
-        money
-    };
-
-    pos: Vec2,
-    kind: Kind,
-};
-
 const world_size = Vec2.init(20 * 16, 15 * 16);
 const invincibility_duration_s = 0.5;
-const pickup_spawn_duration_s = Range.init(1, 5);
 const wave_infos = [_]Wave.Info{
     .{
         .kind = .regular,
@@ -196,24 +190,15 @@ bullets: std.ArrayList(Bullet) = .empty,
 lasers: std.ArrayList(Laser) = .empty,
 bombs: std.ArrayList(Bomb) = .empty,
 
-pickups: std.ArrayList(Pickup) = .empty,
-next_pickup_spawn_at: Nanoseconds,
-
 wave_timer: Nanoseconds = 0,
 
 waves: std.ArrayList(Wave) = .empty,
 spawned_waves: std.ArrayList(usize) = .empty,
 
 pub fn init(gpa: Allocator, seed: u64, assets: *Assets, state: State) CombatScreen {
-    var rng = RNGState.init(seed);
-
-    const next_pickup_spawn_at_s = pickup_spawn_duration_s.random(rng.random());
-    const next_pickup_spawn_at: Nanoseconds = @intFromFloat(next_pickup_spawn_at_s * std.time.ns_per_s);
-
     return CombatScreen{
         .gpa = gpa,
         .assets = assets,
-        .next_pickup_spawn_at = next_pickup_spawn_at,
         .player = .{
             .kinetic = .{
                 .pos = world_size.divideScalar(2)
@@ -222,7 +207,7 @@ pub fn init(gpa: Allocator, seed: u64, assets: *Assets, state: State) CombatScre
             .health = state.max_health,
             .max_health = state.max_health,
         },
-        .rng = rng
+        .rng = RNGState.init(seed)
     };
 }
 
@@ -235,7 +220,6 @@ pub fn deinit(self: *CombatScreen) void {
     self.bullets.deinit(self.gpa);
     self.enemies.deinit(self.gpa);
     self.waves.deinit(self.gpa);
-    self.pickups.deinit(self.gpa);
     self.spawned_waves.deinit(self.gpa);
     self.lasers.deinit(self.gpa);
     self.bombs.deinit(self.gpa);
@@ -244,6 +228,7 @@ pub fn deinit(self: *CombatScreen) void {
 
 const EnemyOptions = struct {
     pos: ?Vec2 = null,
+    sprite: Sprite,
     size: f32 = 20
 };
 
@@ -290,18 +275,8 @@ pub fn spawnEnemy(self: *CombatScreen, opts: EnemyOptions) !Enemy.Id {
     return try self.enemies.insert(self.gpa, Enemy{
         .kinetic = .{ .pos = pos },
         .speed = 50,
-        .size = opts.size
+        .size = opts.size,
-    });
+        .sprite = opts.sprite
-}
-
-pub fn spawnPickup(self: *CombatScreen) !void {
-    const margin = 10;
-    const spawn_area = (Rect{ .pos = .zero, .size = world_size }).grow(-margin);
-    const pos = Vec2.initRandomRect(self.rng.random(), spawn_area);
-
-    try self.pickups.append(self.gpa, Pickup{
-        .pos = pos,
-        .kind = .money
     });
 }
 
@@ -310,7 +285,49 @@ const TickResult = struct {
     player_finished: bool
 };
 
+fn drawMap(self: *CombatScreen, frame: *Engine.Frame) void {
+    const tilemap = self.assets.dungeon_tilemap;
+    const texture_info = Engine.Graphics.getTextureInfo(tilemap.texture);
+    const tilemap_size = Vec2.initFromInt(u32, texture_info.width, texture_info.height);
+
+    for (self.assets.map.layers) |layer| {
+        if (layer.variant != .tile) {
+            continue;
+        }
+
+        const tile_layer = layer.variant.tile;
+        for (0..tile_layer.height) |y| {
+            for (0..tile_layer.width) |x| {
+                const tile_gid = tile_layer.get(@intCast(x), @intCast(y)) orelse continue;
+                if (tile_gid == 0) continue;
+
+                const tile = self.assets.map.getTile(self.assets.tilesets, tile_gid) orelse continue;
+                const tile_id_f32: f32 = @floatFromInt(tile.id);
+                const width_in_tiles = tilemap_size.x / tilemap.tile_size.x;
+                const tile_x = @rem(tile_id_f32, width_in_tiles);
+                const tile_y = @divFloor(tile_id_f32, width_in_tiles);
+
+                frame.drawRectangle(.{
+                    .rect = .{
+                        .pos = Vec2.initFromInt(usize, x, y).multiply(tilemap.tile_size),
+                        .size = tilemap.tile_size
+                    },
+                    .color = rgb(255, 255, 255),
+                    .sprite = .{
+                        .texture = tilemap.texture,
+                        .uv = tilemap.getTileUV(tile_x, tile_y)
+                    },
+                    .uv_flip_diagonal = tile.flip_diagonal,
+                    .uv_flip_vertical = tile.flip_vertical,
+                    .uv_flip_horizontal = tile.flip_horizontal,
+                });
+            }
+        }
+    }
+}
+
 pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResult {
+
     const dt = frame.deltaTime();
 
     var result = TickResult{
@@ -357,7 +374,9 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
             while (wave.enemies_spawned < expected_enemies) {
                 switch (wave.kind) {
                     .regular => {
-                        _ = try self.spawnEnemy(.{});
+                        _ = try self.spawnEnemy(.{
+                            .sprite = self.assets.skeleton
+                        });
                     },
                     .snake => {
                         var arena = std.heap.ArenaAllocator.init(self.gpa);
@@ -367,7 +386,9 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
                         const rand = self.rng.random();
                         const snake_length = rand.intRangeAtMost(u32, wave.min_group_size, wave.max_group_size);
 
-                        const head_id = try self.spawnEnemy(.{ });
+                        const head_id = try self.spawnEnemy(.{
+                            .sprite = self.assets.snake
+                        });
                         try enemies.append(arena.allocator(), head_id);
 
                         const head = self.enemies.getAssumeExists(head_id);
@@ -379,6 +400,7 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
                         for (0..snake_length) |i| {
                             const tail_pos = head_pos.sub(dir_to_center.multiplyScalar(@floatFromInt(i * gap)));
                             const tail_id = try self.spawnEnemy(.{
+                                .sprite = self.assets.snake,
                                 .pos = tail_pos
                             });
                             try enemies.append(arena.allocator(), tail_id);
@@ -407,6 +429,7 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
 
                             const enemy_id = try self.spawnEnemy(.{
                                 .pos = center.add(Vec2.initAngle(angle).multiplyScalar(distance)),
+                                .sprite = self.assets.fire_spirit,
                                 .size = 10
                             });
                             try enemies.append(arena.allocator(), enemy_id);
@@ -434,19 +457,9 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
         }
     }
 
-    if (self.wave_timer >= self.next_pickup_spawn_at) {
-        const next_pickup_spawn_at_s = pickup_spawn_duration_s.random(self.rng.random());
-        const next_pickup_spawn_at: Nanoseconds = @intFromFloat(next_pickup_spawn_at_s * std.time.ns_per_s);
-        self.next_pickup_spawn_at = self.wave_timer + next_pickup_spawn_at;
-        try self.spawnPickup();
-    }
-
     frame.graphics.canvas_size = world_size;
 
-    frame.drawRectangle(.{
+    self.drawMap(frame);
-        .rect = .init(0, 0, world_size.x, world_size.y),
-        .color = rgb(20, 20, 20)
-    });
 
     var dir = Vec2.init(0, 0);
     if (frame.isKeyDown(.W)) {
@@ -500,8 +513,7 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
         if (frame.isMouseDown(.left) and cooldown_complete) {
             self.player.last_shot_at = frame.time_ns;
 
-            if (self.player.gun) |gun| {
+            switch (self.player.gun) {
-                switch (gun) {
                 .pistol => {
                     try self.bullets.append(self.gpa, .{
                         .kinetic = .{
@@ -534,11 +546,19 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
             }
         }
     }
-    }
+
 
     frame.drawRectangle(.{
         .rect = self.player.getRect(),
-        .color = rgb(255, 255, 255)
+        .color = rgb(255, 255, 255),
+        .sprite = .{
+            .texture = switch (self.player.gun) {
+                .pistol => self.assets.pistol_mask,
+                .bomb => self.assets.bomb_mask,
+                .laser => self.assets.laser_mask,
+            },
+            .uv = .unit
+        }
     });
 
     for (self.bullets.items) |*bullet| {
@@ -775,40 +795,19 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
             }
 
             enemy.kinetic.update(dt, .{});
+
             frame.drawRectangle(.{
                 .rect = enemy_rect,
-                .color = rgb(20, 200, 20)
+                .color = rgba(20, 20, 200, 0.2),
             });
-        }
-    }
-
-    {
-        var index: usize = 0;
-        while (index < self.pickups.items.len) {
-            var destroy: bool = false;
-            const pickup = self.pickups.items[index];
-
-            const pickup_rect = Rect.initCentered(pickup.pos.x, pickup.pos.y, 10, 10);
-
-            if (pickup_rect.hasOverlap(self.player.getRect())) {
-                switch (pickup.kind) {
-                    .money => {
-                        state.money += 1;
-                    }
-                }
-                destroy = true;
-            }
 
+            const pos = enemy.kinetic.pos;
+            const sprite_size = enemy.sprite.getSize();
             frame.drawRectangle(.{
-                .rect = pickup_rect,
+                .rect = Rect.initCentered(pos.x, pos.y, sprite_size.x, sprite_size.y),
-                .color = rgb(20, 20, 200)
+                .color = rgb(255, 255, 255),
+                .sprite = enemy.sprite
             });
-
-            if (destroy) {
-                _ = self.pickups.swapRemove(index);
-            } else {
-                index += 1;
-            }
         }
     }
 
@@ -842,7 +841,7 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
 
     frame.drawTextFormat(.init(10, 30), text_opts, "{d}", .{ state.money });
     frame.drawTextFormat(.init(10, 50), text_opts, "{d}/{d}", .{ self.player.health, self.player.max_health });
-    frame.drawTextFormat(.init(10, 70), text_opts, "{?}", .{ self.player.gun });
+    frame.drawTextFormat(.init(10, 70), text_opts, "{}", .{ self.player.gun });
 
     result.player_died = (self.player.health == 0);
     if (self.enemies.count == 0 and self.waves.items.len == 0 and self.spawned_waves.items.len == wave_infos.len) {

src/engine/graphics.zig

@@ -46,6 +46,9 @@ pub const Command = union(enum) {
         sprite: ?Sprite = null,
         rotation: f32 = 0,
         origin: Vec2 = .init(0, 0),
+        uv_flip_diagonal: bool = false,
+        uv_flip_horizontal: bool = false,
+        uv_flip_vertical: bool = false
     };
 
     pub const DrawCircle = struct {
@@ -88,6 +91,12 @@ pub const TextureInfo = Texture.Info;
 pub const Sprite = struct {
     texture: TextureId,
     uv: Rect,
+
+    pub fn getSize(self: Sprite) Vec2 {
+        const texture_info = getTextureInfo(self.texture);
+        const texture_size = Vec2.initFromInt(u32, texture_info.width, texture_info.height);
+        return self.uv.size.multiply(texture_size);
+    }
 };
 
 var gpa: std.mem.Allocator = undefined;
@@ -333,7 +342,41 @@ fn drawRectangle(opts: Command.DrawRectangle) void {
 
     if (opts.sprite) |sprite| {
         const uv = sprite.uv;
-        const quad = [4]Vertex{ .{ .pos = pos.add(top_left), .uv = .init(uv.left(), uv.top()) }, .{ .pos = pos.add(top_right), .uv = .init(uv.right(), uv.top()) }, .{ .pos = pos.add(bottom_right), .uv = .init(uv.right(), uv.bottom()) }, .{ .pos = pos.add(bottom_left), .uv = .init(uv.left(), uv.bottom()) } };
+        var uv_top_left = Vec2.init(uv.left(), uv.top());
+        var uv_top_right = Vec2.init(uv.right(), uv.top());
+        var uv_bottom_right = Vec2.init(uv.right(), uv.bottom());
+        var uv_bottom_left = Vec2.init(uv.left(), uv.bottom());
+
+        if (opts.uv_flip_diagonal) {
+            std.mem.swap(Vec2, &uv_bottom_left, &uv_top_right);
+        }
+        if (opts.uv_flip_horizontal) {
+            std.mem.swap(Vec2, &uv_top_left, &uv_top_right);
+            std.mem.swap(Vec2, &uv_bottom_left, &uv_bottom_right);
+        }
+        if (opts.uv_flip_vertical) {
+            std.mem.swap(Vec2, &uv_top_left, &uv_bottom_left);
+            std.mem.swap(Vec2, &uv_top_right, &uv_bottom_right);
+        }
+
+        const quad = [4]Vertex{
+            .{
+                .pos = pos.add(top_left),
+                .uv = uv_top_left
+            },
+            .{
+                .pos = pos.add(top_right),
+                .uv = uv_top_right,
+            },
+            .{
+                .pos = pos.add(bottom_right),
+                .uv = uv_bottom_right
+            },
+            .{
+                .pos = pos.add(bottom_left),
+                .uv = uv_bottom_left
+            }
+        };
         drawQuad(quad, opts.color, sprite.texture);
     } else {
         const quad = .{ pos.add(top_left), pos.add(top_right), pos.add(bottom_right), pos.add(bottom_left) };

src/engine/math.zig

@@ -368,6 +368,11 @@ pub const Rect = struct {
     pos: Vec2,
     size: Vec2,
 
+    pub const unit = Rect{
+        .pos = .zero,
+        .size = .init(1, 1),
+    };
+
     pub const zero = Rect{
         .pos = Vec2.zero,
         .size = Vec2.zero

src/game.zig

@@ -124,10 +124,6 @@ pub fn debug(self: *Game) !void {
     }
     defer imgui.endWindow();
 
-    if (imgui.button("Spawn enemy")) {
-        _ = try self.combat_screen.spawnEnemy(.{});
-    }
-
     if (imgui.button("Restart")) {
         try self.restartAndShowCombatScreen();
     }
@@ -144,10 +140,7 @@ pub fn debug(self: *Game) !void {
 
     const screen = &self.combat_screen;
 
-    const time_left_til_pickup = screen.next_pickup_spawn_at - screen.wave_timer;
-
     imgui.textFmt("Waves: {}\n", .{screen.waves.items.len});
     imgui.textFmt("Bullets: {}\n", .{screen.bullets.items.len});
     imgui.textFmt("Enemies: {}\n", .{screen.enemies.count});
-    imgui.textFmt("Time until next pickup: {d:.2}s\n", .{@as(f32, @floatFromInt(time_left_til_pickup)) / std.time.ns_per_s});
 }