game ticks api

src/runner/runner.rs

@@ -23,12 +23,49 @@ impl std::fmt::Display for Error{
 }
 impl std::error::Error for Error{}
 
+fn coerce_float64(value:&mlua::Value)->Option<f64>{
+	match value{
+		&mlua::Value::Integer(i)=>Some(i as f64),
+		&mlua::Value::Number(f)=>Some(f),
+		_=>None,
+	}
+}
+fn scheduler_mut<T>(lua:&mlua::Lua,mut f:impl FnMut(&mut crate::scheduler::Scheduler)->mlua::Result<T>)->mlua::Result<T>{
+	let mut scheduler=lua.app_data_mut::<crate::scheduler::Scheduler>().ok_or(mlua::Error::runtime("Scheduler missing"))?;
+	f(&mut *scheduler)
+}
 fn init(lua:&mlua::Lua)->mlua::Result<()>{
 	lua.sandbox(true)?;
 
 	//global environment
 	let globals=lua.globals();
 
+	let schedule_thread=lua.create_function(move|lua,dt:mlua::Value|{
+		let delay=coerce_float64(&dt).ok_or(mlua::Error::runtime("Expected float"))?.max(0.0)*60.0;
+		if delay<u64::MAX as f64{
+			scheduler_mut(lua,|scheduler|{
+				scheduler.schedule_thread((delay as u64).max(2),lua.current_thread());
+				Ok(())
+			}).unwrap();
+		}
+		Ok(())
+	})?;
+	let wait_env=lua.create_table()?;
+	wait_env.raw_set("coroutine",globals.get::<mlua::Table>("coroutine")?)?;
+	wait_env.raw_set("schedule_thread",schedule_thread)?;
+	let wait=lua.load("
+		local coroutine_yield=coroutine.yield
+		local schedule_thread=schedule_thread
+		return function(dt)
+			schedule_thread(dt)
+			return coroutine_yield()
+		end
+	")
+	.set_name("wait")
+	.set_environment(wait_env)
+	.call::<mlua::Function>(())?;
+	globals.raw_set("wait",wait)?;
+
 	super::r#enum::set_globals(lua,&globals)?;
 	super::color3::set_globals(lua,&globals)?;
 	super::vector3::set_globals(lua,&globals)?;
@@ -93,4 +130,23 @@ impl Runnable<'_>{
 		// No need to schedule the thread here
 		Ok(())
 	}
+	pub fn has_scheduled_threads(&self)->Result<bool,mlua::Error>{
+		scheduler_mut(&self.lua,|scheduler|
+			Ok(scheduler.has_scheduled_threads())
+		)
+	}
+	pub fn game_tick(&self)->Result<(),mlua::Error>{
+		if let Some(threads)=scheduler_mut(&self.lua,|scheduler|Ok(scheduler.tick_threads()))?{
+			for thread in threads{
+				//TODO: return dt and total run time
+				let result=thread.resume::<mlua::MultiValue>((1.0/20.0,0.0))
+					.map_err(|error|Error::Lua{source:"source unavailable".to_owned(),error});
+				match result{
+					Ok(_)=>(),
+					Err(e)=>println!("game_tick Error: {e}"),
+				}
+			}
+		}
+		Ok(())
+	}
 }

src/scheduler.rs

@@ -43,6 +43,9 @@ impl Scheduler{
 	pub const fn tick(&self)->Tick{
 		self.tick
 	}
+	pub fn has_scheduled_threads(&self)->bool{
+		!self.schedule.is_empty()
+	}
 	pub fn schedule_thread(&mut self,delay:u64,thread:mlua::Thread){
 		self.schedule.entry(self.tick+delay.max(1))
 		.or_insert(Vec::new())