Desktop: Implement GPU accelerated offscreen rendering and improve rendering efficency (#3056)

* WIP accelerade offscreen canvas implementation

* Implement vulkan dmabuf import

* Add fps printing

* Add feature gates

* Forgot to add file

* Experimental windows support

* Cast ptr to isize

* Remove testing chrome://flags url

* Experimental macos support for texture import

* Cleanup code and improve latency / frame pacing

* Add path for importing textures on windows through dx12

* Update doc comment

* Import textures through metal on macos

* Review cleanup

---------

Co-authored-by: Timon Schelling <me@timon.zip>

desktop/src/main.rs

@@ -1,5 +1,6 @@
 use std::process::exit;
-use std::time::{Duration, Instant};
+use std::time::Instant;
+
 use tracing_subscriber::EnvFilter;
 use winit::event_loop::EventLoop;
 
@@ -16,7 +17,7 @@ use app::WinitApp;
 mod dirs;
 
 use graphite_desktop_wrapper::messages::DesktopWrapperMessage;
-use graphite_desktop_wrapper::{DesktopWrapper, NodeGraphExecutionResult, WgpuContext};
+use graphite_desktop_wrapper::{NodeGraphExecutionResult, WgpuContext};
 
 pub(crate) enum CustomEvent {
 	UiUpdate(wgpu::Texture),
@@ -56,21 +57,6 @@ fn main() {
 
 	tracing::info!("Cef initialized successfully");
 
-	let rendering_loop_proxy = event_loop.create_proxy();
-	let target_fps = 60;
-	std::thread::spawn(move || {
-		loop {
-			let last_render = Instant::now();
-
-			let result = futures::executor::block_on(DesktopWrapper::execute_node_graph());
-			let _ = rendering_loop_proxy.send_event(CustomEvent::NodeGraphExecutionResult(result));
-
-			let frame_time = Duration::from_secs_f32((target_fps as f32).recip());
-			let sleep = last_render + frame_time - Instant::now();
-			std::thread::sleep(sleep);
-		}
-	});
-
 	let mut winit_app = WinitApp::new(cef_context, window_size_sender, wgpu_context, event_loop.create_proxy());
 
 	event_loop.run_app(&mut winit_app).unwrap();