Example of using InputSystem with Unity Entities

InputActionSystem.cs

// Managed IComponent
public class InputActionSingleton : IComponentData
{
	// InputSystem actions asset wrapper which is auto generated by the asset.
	// Has accessors for your Actions created in the asset.
	public InputActions InputActions;
	
	public InputActionSingleton()
	{
		InputActions = new InputActions();
		InputActions.Enable();
	}
	
	public InputAction Move => InputActions.Gameplay.Move;
	public InputAction Jump => InputActions.Gameplay.Jump;
}

// MoveInputAction and JumpInputAction could be combined into 1 struct.

public struct MoveInputAction : IComponentData
{
	public float2 Axis;
}

public struct JumpInputAction : IComponentData
{
	// Could use bit fields/states instead or just bytes.
	public bool IsPressed;
	public bool WasPressed;
	public bool WasReleased;
}

[UpdateInGroup(typeof(InitializationSystemGroup))]
public partial struct InputActionSystem : ISystem
{
	public void OnCreate(ref SystemState state)
	{
		var entity = state.EntityManager.CreateSingleton(new InputActionSingleton());
		state.EntityManager.AddComponent<MoveInputAction>(entity);
		state.EntityManager.AddComponent<JumpInputAction>(entity);
	}
	
	// Can't be bursted.
	public void OnUpdate(ref SystemState state)
	{
		// You could just use this singleton in any other system but it can't be bursted.
		var inputActionSingleton = SystemAPI.ManagedAPI.GetSingleton<InputActionSingleton>();
		
		var moveInputAction = SystemAPI.GetSingletonRW<MoveInputAction>();
		var jumpInputAction = SystemAPI.GetSingletonRW<JumpInputAction>();
		
		// Copy the data into the actions structs which can then be accessed from other systems
		// and bursted.
		
		moveInputAction.ValueRW.Axis = inputActionSingleton.Move.ReadValue<Vector2>();
		
		jumpInputAction.ValueRW.IsPressed = inputActionSingleton.Jump.IsPressed();
		jumpInputAction.ValueRW.WasPressed = inputActionSingleton.Jump.WasPressedThisFrame();
		jumpInputAction.ValueRW.WasReleased = inputActionSingleton.Jump.WasReleasedThisFrame();
	}
};

public partial struct PlayerInputSystem : ISystem
{
	[BurstCompile]
	public void OnCreate(ref SystemState state)
	{
		state.RequireForUpdate<MoveInputAction>();
		state.RequireForUpdate<JumpInputAction>();
	}

	[BurstCompile]
	public void OnUpdate(ref SystemState state)
	{
		var moveInputAction = SystemAPI.GetSingleton<MoveInputAction>();
		var jumpInputAction = SystemAPI.GetSingleton<JumpInputAction>();

		// example character state
		foreach(var characterState in SystemAPI.Query<RefRW<CharacterState>>()
											   .WithAll<PlayerCharacterTag>())
		{
			characterState.ValueRW.MoveVector = new float3(moveInputAction.Axis.x, 0f, moveInputAction.Axis.y);
			characterState.ValueRW.JumpState = jumpInputAction;
		}
	}
}