From 398722313716885bf6d2835f86576d2ae6615572 Mon Sep 17 00:00:00 2001
From: Micha White <botahamec@outlook.com>
Date: Sun, 20 Nov 2022 12:26:13 -0500
Subject: Allowed queuing of a new priority

---
 alligator_resources/Cargo.toml     |  1 +
 alligator_resources/src/texture.rs | 39 +++++++++++++++++++++++++++++++++++---
 2 files changed, 37 insertions(+), 3 deletions(-)

(limited to 'alligator_resources')

diff --git a/alligator_resources/Cargo.toml b/alligator_resources/Cargo.toml
index 74a696b..3ccb084 100644
--- a/alligator_resources/Cargo.toml
+++ b/alligator_resources/Cargo.toml
@@ -12,3 +12,4 @@ exun = "0.1"
 texture_packer = { git = "https://github.com/botahamec/piston_texture_packer", branch = "u16" }
 profiling = "1"
 bytemuck = { version = "1", features = ["extern_crate_alloc"] }
+parking_lot = "0.12"
diff --git a/alligator_resources/src/texture.rs b/alligator_resources/src/texture.rs
index 2255b3f..4b55f95 100644
--- a/alligator_resources/src/texture.rs
+++ b/alligator_resources/src/texture.rs
@@ -5,6 +5,7 @@ use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 
 use image::{GenericImage, ImageBuffer};
+use parking_lot::Mutex;
 use texture_packer::exporter::ImageExporter;
 use texture_packer::{Frame, TexturePacker, TexturePackerConfig};
 use thiserror::Error;
@@ -144,6 +145,7 @@ enum TextureBuffer {
 
 struct Texture {
 	priority: Priority,
+	queued_priority: Arc<Mutex<Option<Priority>>>,
 	buffer: TextureBuffer,
 }
 
@@ -151,6 +153,7 @@ impl Texture {
 	fn from_buffer(texture: Rgba16Texture) -> Self {
 		Self {
 			priority: Priority::Urgent, // indicates that it can't be unloaded
+			queued_priority: Arc::new(Mutex::new(None)),
 			buffer: TextureBuffer::Memory(Arc::new(texture)),
 		}
 	}
@@ -158,6 +161,7 @@ impl Texture {
 	fn from_path(path: impl AsRef<Path>, priority: Priority) -> Self {
 		Self {
 			priority,
+			queued_priority: Arc::new(Mutex::new(None)),
 			buffer: TextureBuffer::Disk(TextureFile::new(path)),
 		}
 	}
@@ -166,13 +170,29 @@ impl Texture {
 		self.priority
 	}
 
-	fn set_priority(&mut self, priority: Priority) {
+	fn _set_priority(buffer: &TextureBuffer, src: &mut Priority, priority: Priority) -> bool {
 		// memory textures and textures in use should always be urgent
-		if let TextureBuffer::Disk(disk) = &self.buffer && !disk.is_used() {
-			self.priority = priority;
+		if let TextureBuffer::Disk(disk) = buffer && !disk.is_used() {
+			*src = priority;
+			true
+		} else {
+			false
 		}
 	}
 
+	fn unqueue_priority(&mut self) {
+		let mut queued_priority = self.queued_priority.lock();
+		let unqueued_priority = queued_priority.unwrap_or(Priority::Unnecessary);
+
+		if Self::_set_priority(&self.buffer, &mut self.priority, unqueued_priority) {
+			*queued_priority = None;
+		}
+	}
+
+	fn set_priority(&mut self, priority: Priority) {
+		Self::_set_priority(&self.buffer, &mut self.priority, priority);
+	}
+
 	fn load_texture(&mut self) -> Result<&Rgba16Texture, LoadError> {
 		match &mut self.buffer {
 			TextureBuffer::Memory(ref texture) => Ok(texture),
@@ -199,11 +219,18 @@ impl Texture {
 			TextureBuffer::Disk(file) => file.is_loaded(),
 		}
 	}
+
+	fn unqueue(&mut self) {
+		if let Some(queued_priority) = *self.queued_priority.lock() {
+			self.priority = queued_priority;
+		}
+	}
 }
 
 pub struct TextureRef<'a> {
 	id: TextureId,
 	texture: Arc<Rgba16Texture>,
+	queued_priority: Arc<Mutex<Option<Priority>>>,
 	manager: &'a TextureManager,
 }
 
@@ -250,6 +277,11 @@ impl<'a> TextureRef<'a> {
 	pub fn height(&self) -> f32 {
 		self.manager.texture_height(self)
 	}
+
+	pub fn queue_priority(&self, priority: Priority) {
+		let mut queued_priority = self.queued_priority.lock();
+		*queued_priority = Some(priority);
+	}
 }
 
 pub struct TextureManager {
@@ -315,6 +347,7 @@ impl TextureManager {
 		let mut total_size = size;
 
 		for texture in textures {
+			texture.unqueue_priority();
 			if total_size + texture.allocated_size() < max_size {
 				total_size += texture.allocated_size();
 			} else if texture.priority() < priority {
-- 
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