letsplay_runner_core: Make GraphicsContexts clonable

It currently consists solely of smart poitners, so cloning just adds a reference count, it doesn't deep copy anything.

crates/letsplay_runner_core/src/client/graphics_contexts.rs

@@ -11,13 +11,15 @@ use letsplay_gpu::egl_helpers::DeviceContext;
 use std::sync::{Arc, Mutex};
 
 #[cfg(feature = "av-nvidia")]
+#[derive(Clone)]
 pub struct GraphicsContexts {
 	pub egl_device_context: Arc<Mutex<DeviceContext>>,
 	pub cuda_context: Arc<CudaDevice>,
 	pub cuda_interop_context: Arc<Mutex<GraphicsResource>>,
 }
 
 #[cfg(not(feature = "av-nvidia"))]
+#[derive(Clone)]
 pub struct GraphicsContexts {
 	pub egl_device_context: Arc<Mutex<DeviceContext>>,
 }

crates/letsplay_runner_retro/src/main.rs

@@ -4,6 +4,7 @@ use std::{
 	time::{Duration, Instant},
 };
 
+use client::GraphicsContexts;
 use letsplay_core::sleep;
 use letsplay_gpu::{self as gpu, egl_helpers::DeviceContext};
 use letsplay_retro_frontend::{
@@ -14,6 +15,8 @@ use letsplay_runner_core::*;
 
 /// Libretro game. very much TODO
 pub struct RetroGame {
+	graphics_contexts: Option<GraphicsContexts>,
+
 	devices: BTreeMap<i32, AnyDevice>,
 
 	frontend: Option<Box<Frontend>>,
@@ -25,6 +28,7 @@ pub struct RetroGame {
 impl RetroGame {
 	fn new() -> Box<Self> {
 		let mut s = Box::new(Self {
+			graphics_contexts: None,
 			devices: BTreeMap::new(),
 			frontend: None,
 			frame_duration: Duration::new(0, 0),
@@ -57,6 +61,9 @@ impl client::Game for RetroGame {
 			let lk = graphics_contexts.egl_device_context.lock().expect("???");
 			lk.make_current();
 		}
+
+		// Scary but these are all Arc<> pointers anyways so its not a big deal
+		self.graphics_contexts = Some(graphics_contexts.clone());
 	}
 
 	fn reset(&mut self) {