flip sprites

src/assets.zig

@@ -41,6 +41,7 @@ font_id: FontName.EnumArray,
 pistol_mask: Gfx.TextureId,
 bomb_mask: Gfx.TextureId,
 laser_mask: Gfx.TextureId,
+bullet: Gfx.TextureId,
 dungeon_tilemap: Tilemap,
 
 skeleton: Gfx.Sprite,
@@ -89,14 +90,13 @@ pub fn init(gpa: std.mem.Allocator) !Assets {
             .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(&.{
+    const skeleton_image = try STBImage.load(@embedFile("assets/skeleton.png"));
+    defer skeleton_image.deinit();
+    const skeleton_texture = try Gfx.addTexture(&.{
         .{
-            .width = creatures_image.width,
-            .height = creatures_image.height,
-            .rgba = creatures_image.rgba8_pixels
+            .width = skeleton_image.width,
+            .height = skeleton_image.height,
+            .rgba = skeleton_image.rgba8_pixels
         }
     });
 
@@ -120,17 +120,23 @@ pub fn init(gpa: std.mem.Allocator) !Assets {
         }
     });
 
-    const creatures_tilemap = Tilemap{
-        .texture = creatures_texture,
-        .tile_size = .init(16, 16)
-    };
+    const bullet_image = try STBImage.load(@embedFile("assets/bullet.png"));
+    defer bullet_image.deinit();
+    const bullet_texture = try Gfx.addTexture(&.{
+        .{
+            .width = bullet_image.width,
+            .height = bullet_image.height,
+            .rgba = bullet_image.rgba8_pixels
+        }
+    });
+
     const snake = Gfx.Sprite{
         .texture = snake_texture,
         .uv = .unit
     };
     const skeleton = Gfx.Sprite{
-        .texture = creatures_texture,
-        .uv = creatures_tilemap.getTileUV(1, 0)
+        .texture = skeleton_texture,
+        .uv = .unit
     };
     const fire_spirit = Gfx.Sprite{
         .texture = fire_spirit_texture,
@@ -181,6 +187,7 @@ pub fn init(gpa: std.mem.Allocator) !Assets {
         .fire_spirit = fire_spirit,
         .map = map,
         .tilesets = tilesets,
+        .bullet = bullet_texture,
         .dungeon_tilemap = .{
             .texture = dungeon_texture,
             .tile_size = .init(16, 16)

src/combat_screen.zig

@@ -57,6 +57,7 @@ const Player = struct {
     last_shot_at: ?Nanoseconds = null,
     invincible_until: ?Nanoseconds = null,
     gun: Gun = .pistol,
+    facing_left: bool = false,
 
     pub fn getRect(self: Player) Rect {
         const pos = self.kinetic.pos;
@@ -93,6 +94,7 @@ const Enemy = struct {
     speed: f32,
     size: f32,
     sprite: Sprite,
+    facing_left: bool = false,
 
     target: ?Vec2 = null,
     distance_to_target: ?f32 = null,
@@ -327,7 +329,6 @@ fn drawMap(self: *CombatScreen, frame: *Engine.Frame) void {
 }
 
 pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResult {
-
     const dt = frame.deltaTime();
 
     var result = TickResult{
@@ -476,6 +477,10 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
     }
     dir = dir.normalized();
 
+    if (dir.x != 0) {
+        self.player.facing_left = dir.x < 0;
+    }
+
     if (frame.isKeyPressed(._1)) {
         self.player.gun = .pistol;
     } else if (frame.isKeyPressed(._2)) {
@@ -548,18 +553,32 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
     }
 
 
-    frame.drawRectangle(.{
-        .rect = self.player.getRect(),
-        .color = rgb(255, 255, 255),
-        .sprite = .{
+    {
+        var sprite = Engine.Graphics.Sprite{
             .texture = switch (self.player.gun) {
                 .pistol => self.assets.pistol_mask,
                 .bomb => self.assets.bomb_mask,
                 .laser => self.assets.laser_mask,
             },
             .uv = .unit
+        };
+
+        const sprite_size = sprite.getSize();
+        if (self.player.facing_left) {
+            sprite = sprite.flipHorizontal();
         }
-    });
+        const pos = self.player.kinetic.pos;
+        frame.drawRectangle(.{
+            .rect = Rect.initCentered(pos.x, pos.y, sprite_size.x, sprite_size.y),
+            .color = rgb(255, 255, 255),
+            .sprite = sprite
+        });
+
+        frame.drawRectangle(.{
+            .rect = self.player.getRect(),
+            .color = rgba(255, 255, 255, 0.5),
+        });
+    }
 
     for (self.bullets.items) |*bullet| {
         bullet.kinetic.vel = bullet.dir.multiplyScalar(bullet.speed);
@@ -576,9 +595,20 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
             }
         }
 
+        const pos = bullet.kinetic.pos;
+        const sprite_size = Engine.Graphics.getTextureSize(self.assets.bullet);
+        frame.drawRectangle(.{
+            .rect = Rect.initCentered(pos.x, pos.y, sprite_size.x, sprite_size.y),
+            .color = rgb(255, 255, 255),
+            .sprite = .{
+                .texture = self.assets.bullet,
+                .uv = .unit
+            }
+        });
+
         frame.drawRectangle(.{
             .rect = bullet_rect,
-            .color = rgb(200, 20, 255)
+            .color = rgba(200, 20, 255, 0.5)
         });
     }
 
@@ -772,6 +802,7 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
             if (to_target.length() > 1) {
                 const dir_to_target = to_target.normalized();
                 enemy.kinetic.vel = dir_to_target.multiplyScalar(enemy.speed);
+                enemy.facing_left = enemy.kinetic.vel.x < 0;
             } else {
                 enemy.kinetic.vel = .zero;
             }
@@ -796,17 +827,21 @@ pub fn tick(self: *CombatScreen, state: *State, frame: *Engine.Frame) !TickResul
 
             enemy.kinetic.update(dt, .{});
 
-            frame.drawRectangle(.{
-                .rect = enemy_rect,
-                .color = rgba(20, 20, 200, 0.2),
-            });
-
             const pos = enemy.kinetic.pos;
             const sprite_size = enemy.sprite.getSize();
+            var sprite = enemy.sprite;
+            if (enemy.facing_left) {
+                sprite = sprite.flipHorizontal();
+            }
             frame.drawRectangle(.{
                 .rect = Rect.initCentered(pos.x, pos.y, sprite_size.x, sprite_size.y),
                 .color = rgb(255, 255, 255),
-                .sprite = enemy.sprite
+                .sprite = sprite
+            });
+
+            frame.drawRectangle(.{
+                .rect = enemy_rect,
+                .color = rgba(20, 20, 200, 0.2),
             });
         }
     }

src/engine/graphics.zig

@@ -92,6 +92,17 @@ pub const Sprite = struct {
     texture: TextureId,
     uv: Rect,
 
+    pub fn flipHorizontal(self: Sprite) Sprite {
+        var uv = self.uv;
+        uv.pos.x += uv.size.x;
+        uv.size.x *= -1;
+
+        return Sprite{
+            .texture = self.texture,
+            .uv = uv
+        };
+    }
+
     pub fn getSize(self: Sprite) Vec2 {
         const texture_info = getTextureInfo(self.texture);
         const texture_size = Vec2.initFromInt(u32, texture_info.width, texture_info.height);
@@ -456,3 +467,8 @@ pub fn getTextureInfo(id: TextureId) TextureInfo {
     const texture = textures.items[@intFromEnum(id)];
     return texture.info;
 }
+
+pub fn getTextureSize(id: TextureId) Vec2 {
+    const texture_info = getTextureInfo(id);
+    return Vec2.initFromInt(u32, texture_info.width, texture_info.height);
+}