void Update()
{
// only do an update if the data has been initialized
if (!positions.IsCreated)
{
return;
}
var deltaTime = Time.deltaTime;
// FORCE ACCUMILATION
// First off lets apply gravity to all the object in our scene that arnt currently asleep
var gravityJob = new GravityJob()
{
DeltaTime = deltaTime,
Gravity = gravity,
Velocities = velocities,
Sleeping = sleeping
};
var gravityDependency = gravityJob.Schedule(objectCount, 32);
// TODO accumilate other forces here! gravity is just the simplest force to apply to our objects,
// but theres no limit on the kind of forces we can simulate. We could add friction, air resistnace,
// constant acceleration, joints and constrainsts, boyancy.. anything we can think of that can effect
// the velocity of an object can have its own job scheduled here.
// INTERGRATION AND COLLISION
// Create temporary arrays for the raycast info. Lets use the TempJob allocator,
// this means we have to dispose them when the job has finished - its short lived data
var raycastCommands = new NativeArray <RaycastCommand>(objectCount, Allocator.TempJob);
var raycastHits = new NativeArray <RaycastHit>(objectCount, Allocator.TempJob);
// Lets schedule jobs to do a collision raycast for each object. One job Prepare s all the raycast commands,
// the second actually does the raycasts.
var setupRaycastsJob = new PrepareRaycastCommands()
{
DeltaTime = deltaTime,
Positions = positions,
Raycasts = raycastCommands,
Velocities = velocities
};
var setupDependency = setupRaycastsJob.Schedule(objectCount, 32, gravityDependency);
// BUG| WORKAROUND - Checked against Unity 2018.1b8
// BUG| RaycastCommand seems to be ignoring any passed in dependencies. We have to explicity wait here.
// BUG| This has been reported to Unity and fixed. When the fix appears in public betas this can be removed.
setupDependency.Complete();
// BUG| END WORKAROUND
var raycastDependency = RaycastCommand.ScheduleBatch(raycastCommands, raycastHits, 32, setupDependency);
// Now we know if there is a collision along our velocity vector, its time to integrate the velocity into
// our objects for the current timeset.
var integrateJob = new IntegratePhysics()
{
DeltaTime = deltaTime,
Positions = positions,
Velocities = velocities,
Sleeping = sleeping,
Hits = raycastHits
};
var integrateDependency = integrateJob.Schedule(objectCount, 32, raycastDependency);
// finally, respond to any collisions that happened in the lsat update step.
var collisionResponeJob = new CalculateCollisionResponse()
{
Hits = raycastHits,
Velocities = velocities,
Sleeping = sleeping
};
var collisionDependency = collisionResponeJob.Schedule(objectCount, 32, integrateDependency);
// Now the physics is done, we need to create a drawing matrix for every object. This simple demo dosnt
// implment roation, so only the translation values in the matrix reallllly matter.
var renderMatrixJob = new CalculateDrawMatricies()
{
positions = positions,
renderMatrices = renderMatrices
};
var matrixJob = renderMatrixJob.Schedule(objectCount, 32, collisionDependency);
// All the jobs we want to execute have been scheduled! By calling .Complete() on the last job in the
// chain, Unity makes the main thread help out with scheduled jobs untill they are all complete.
// then we can move on and use the data caluclated in the jobs safely, without worry about data being changed
// by other threads as we try to use it - we *know* all the work is done
matrixJob.Complete();
// make sure we dispose of the temporary NativeArrays we used for raycasting
raycastCommands.Dispose();
raycastHits.Dispose();
// Well, all the updating is done! lets actually issue a draw!
Graphics.DrawMeshInstanced(mesh, 0, material, renderMatrices.ToArray());
// DEBUG 1 - draw red lines showing object velocity
//for (int i = 0; i < objectCount; i++)
//{
/// Debug.DrawLine(positions[i], positions[i] + velocities[i], Color.red, 0.016f, true);
//}
// DEBUG 2 - draw a trail for a few objects, really helps to visualize the bounce!
//var duration = 01f;
//Debug.DrawLine(positions[0], positions[0] + velocities[0], Color.red, duration, true);
//Debug.DrawLine(positions[200], positions[200] + velocities[200], Color.cyan, duration, true);
//Debug.DrawLine(positions[400], positions[400] + velocities[400], Color.green, duration, true);
//Debug.DrawLine(positions[600], positions[600] + velocities[600], Color.magenta, duration, true);
//Debug.DrawLine(positions[800], positions[800] + velocities[800], Color.yellow, duration, true);
//Debug.DrawLine(positions[1000], positions[1000] + velocities[1000], Color.blue, duration, true);
//Debug.DrawLine(positions[100], positions[100] + velocities[100], Color.red, duration, true);
//Debug.DrawLine(positions[300], positions[300] + velocities[300], Color.cyan, duration, true);
//Debug.DrawLine(positions[500], positions[500] + velocities[500], Color.green, duration, true);
//Debug.DrawLine(positions[700], positions[700] + velocities[700], Color.magenta, duration, true);
//Debug.DrawLine(positions[900], positions[900] + velocities[900], Color.yellow, duration, true);
// finally lets respawn any object that has been asleep and stable for a while
// TODO as of Unity 2018.1b6, NativeArray is the only native collection type. When
// NativeQueue is included in the beta this last task can be jobified!
for (int i = 0; i < objectCount; i++)
{
if (sleeping[i] > 15)
{
Respawn(i);
}
}
}
void Update()
{
// only do an update if the data has been initialized
if (!positions.IsCreated)
{
return;
}
sampler.Begin();
var deltaTime = Time.deltaTime;
// FORCE ACCUMILATION
// First off lets apply gravity to all the object in our scene that arnt currently asleep
var gravityJob = new GravityJob()
{
DeltaTime = deltaTime,
Gravity = gravity,
Velocities = velocities,
Sleeping = sleepingTimer
};
var gravityDependency = gravityJob.Schedule(objectCount, 32);
// TODO accumilate other forces here! gravity is just the simplest force to apply to our objects,
// but theres no limit on the kind of forces we can simulate. We could add friction, air resistnace,
// constant acceleration, joints and constrainsts, boyancy.. anything we can think of that can effect
// the velocity of an object can have its own job scheduled here.
// INTERGRATION AND COLLISION
// Create temporary arrays for the raycast info. Lets use the TempJob allocator,
// this means we have to dispose them when the job has finished - its short lived data
var raycastCommands = new NativeArray <RaycastCommand>(objectCount, Allocator.TempJob);
var raycastHits = new NativeArray <RaycastHit>(objectCount, Allocator.TempJob);
// Lets schedule jobs to do a collision raycast for each object. One job Prepare s all the raycast commands,
// the second actually does the raycasts.
var setupRaycastsJob = new PrepareRaycastCommands()
{
DeltaTime = deltaTime,
Positions = positions,
Raycasts = raycastCommands,
Velocities = velocities
};
var setupDependency = setupRaycastsJob.Schedule(objectCount, 32, gravityDependency);
var raycastDependency = RaycastCommand.ScheduleBatch(raycastCommands, raycastHits, 32, setupDependency);
// Now we know if there is a collision along our velocity vector, its time to integrate the velocity into
// our objects for the current timeset.
var integrateJob = new IntegratePhysics()
{
DeltaTime = deltaTime,
Positions = positions,
Velocities = velocities,
Sleeping = sleepingTimer,
Hits = raycastHits
};
var integrateDependency = integrateJob.Schedule(objectCount, 32, raycastDependency);
// finally, respond to any collisions that happened in the lsat update step.
var collisionResponeJob = new CalculateCollisionResponse()
{
Hits = raycastHits,
Velocities = velocities,
Sleeping = sleepingTimer
};
var collisionDependency = collisionResponeJob.Schedule(objectCount, 32, integrateDependency);
// Now the physics is done, we need to create a drawing matrix for every object. This simple demo dosnt
// implment roation, so only the translation values in the matrix reallllly matter.
var renderMatrixJob = new CalculateDrawMatricies()
{
positions = positions,
renderMatrices = renderMatrices
};
var matrixDependency = renderMatrixJob.Schedule(objectCount, 32, collisionDependency);
// All the jobs we want to execute have been scheduled! By calling .Complete() on the last job in the
// chain, Unity makes the main thread help out with scheduled jobs untill they are all complete.
// then we can move on and use the data caluclated in the jobs safely, without worry about data being changed
// by other threads as we try to use it - we *know* all the work is done
matrixDependency.Complete();
// make sure we dispose of the temporary NativeArrays we used for raycasting
raycastCommands.Dispose();
raycastHits.Dispose();
// lets schedule a job to figure out which objects are sleeping - this can run in the background whilst
// we dispach the drawing commands for this frame.
var sleepJob = new FindSleepingObjects()
{
Sleeping = sleepingTimer,
SleepQueue = asleep.AsParallelWriter()
};
var sleepDependancy = sleepJob.Schedule(objectCount, 32, matrixDependency);
// lets actually issue a draw!
renderMatrices.CopyTo(renderMatrixArray); // copy to a preallocated array, we would get garbage from ToArray()
Graphics.DrawMeshInstanced(mesh, 0, material, renderMatrixArray);
// DEBUG 1 - draw red lines showing object velocity
//for (int i = 0; i < objectCount; i++)
//{
/// Debug.DrawLine(positions[i], positions[i] + velocities[i], Color.red, 0.016f, true);
//}
// DEBUG 2 - draw a trail for a few objects, really helps to visualize the bounce!
//var duration = 01f;
//Debug.DrawLine(positions[0], positions[0] + velocities[0], Color.red, duration, true);
//Debug.DrawLine(positions[200], positions[200] + velocities[200], Color.cyan, duration, true);
//Debug.DrawLine(positions[400], positions[400] + velocities[400], Color.green, duration, true);
//Debug.DrawLine(positions[600], positions[600] + velocities[600], Color.magenta, duration, true);
//Debug.DrawLine(positions[800], positions[800] + velocities[800], Color.yellow, duration, true);
//Debug.DrawLine(positions[1000], positions[1000] + velocities[1000], Color.blue, duration, true);
//Debug.DrawLine(positions[100], positions[100] + velocities[100], Color.red, duration, true);
//Debug.DrawLine(positions[300], positions[300] + velocities[300], Color.cyan, duration, true);
//Debug.DrawLine(positions[500], positions[500] + velocities[500], Color.green, duration, true);
//Debug.DrawLine(positions[700], positions[700] + velocities[700], Color.magenta, duration, true);
//Debug.DrawLine(positions[900], positions[900] + velocities[900], Color.yellow, duration, true);
// finally lets respawn any object that has been found to be asleep (ie not moved for 15 frames)
// were going to respawn that object so there is a constant flow
sleepDependancy.Complete();
for (int i = asleep.Count; i != 0; i--)
{
int index = asleep.Dequeue();
Respawn(index);
}
sampler.End();
}