Brought back the texture atlas

1 files changed, 58 insertions, 1 deletions

diff --git a/alligator_resources/src/texture.rs b/alligator_resources/src/texture.rs
index 74451f3..569f2c6 100644
--- a/alligator_resources/src/texture.rs
+++ b/alligator_resources/src/texture.rs
@@ -363,6 +363,56 @@ impl TextureManager {
 		Ok(id)
 	}
 
+	fn resize_atlas(&mut self, width: u32, height: u32) {
+		self.packer = packer(width, height);
+
+		for (id, texture) in &mut self.textures {
+			if texture.priority == Priority::Urgent {
+				let texture = texture
+					.load_texture()
+					.expect("unable to load texture when putting it in the atlas");
+
+				self.packer
+					.pack_own(*id, texture.clone())
+					.expect("resized atlas is too small");
+			}
+		}
+	}
+
+	fn reset_atlas(&mut self, fallback_width: u32, fallback_height: u32) {
+		self.packer = packer(self.width, self.height);
+
+		let mut failed = false;
+		for (id, texture) in &mut self.textures {
+			if texture.priority == Priority::Urgent {
+				let texture = texture
+					.load_texture()
+					.expect("unable to load texture when putting it in the atlas");
+
+				if self.packer.pack_own(*id, texture.clone()).is_err() {
+					failed = true;
+				}
+			}
+		}
+
+		if failed {
+			self.resize_atlas(fallback_width, fallback_height);
+		}
+	}
+
+	fn load_to_atlas(&mut self, id: TextureId) {
+		let texture = self.textures.get_mut(&id).expect("invalid texture id");
+		let texture = texture
+			.load_texture()
+			.expect("unable to load texture when putting it in the atlas");
+
+		if self.packer.pack_own(id, texture.clone()).is_err() {
+			let fallback_width = self.width * 2 + texture.width();
+			let fallback_height = self.height * 2 + texture.height();
+			self.reset_atlas(fallback_width, fallback_height);
+		}
+	}
+
 	pub fn load_from_file(
 		&mut self,
 		path: impl AsRef<Path>,
@@ -388,6 +438,10 @@ impl TextureManager {
 			self.textures.insert(id, texture);
 		}
 
+		if priority == Priority::Urgent {
+			self.load_to_atlas(id);
+		}
+
 		Ok(id)
 	}
 
@@ -396,7 +450,6 @@ impl TextureManager {
 		let old_priority = texture.priority();
 		texture.set_priority(priority);
 		let size = texture.allocated_size();
-		let priority = texture.priority();
 
 		if priority > old_priority
 			&& priority != Priority::Unnecessary
@@ -407,6 +460,10 @@ impl TextureManager {
 			texture.load_texture()?;
 		}
 
+		if priority == Priority::Urgent {
+			self.load_to_atlas(id);
+		}
+
 		Ok(())
 	}