/// <summary>
/// Returns result of GPU readback of a LOD data. Do not hold onto the returned reference across frames.
/// </summary>
protected PerLodData GetData(Rect sampleAreaXZ, float minSpatialLength)
{
PerLodData lastCandidate = null;
// This data will be returned if lastCandidate is null at the end
PerLodData lastPossibleCandidate = null;
for (int i = 0; i < _perLodData.KeyArray.Length; i++)
{
var lodData = _perLodData.ValueArray[i];
if (!lodData._activelyBeingRendered || lodData._resultData._time == -1f)
{
continue;
}
// Store the last lodData with valid rectangle coverage;
lastPossibleCandidate = lodData;
// Check that the region of interest is covered by this data
var wdcRect = lodData._resultData._renderData.RectXZ;
// Shrink rect by 1 texel border - this is to make finite differences fit as well
float texelWidth = _perLodData.KeyArray[i];
wdcRect.x += texelWidth; wdcRect.y += texelWidth;
wdcRect.width -= 2f * texelWidth; wdcRect.height -= 2f * texelWidth;
if (!wdcRect.Contains(sampleAreaXZ.min) || !wdcRect.Contains(sampleAreaXZ.max))
{
continue;
}
// This data covers our required area, so store it as a potential candidate
lastCandidate = lodData;
// The smallest wavelengths should repeat no more than twice across the smaller spatial length. Unless we're
// in the last LOD - then this is the best we can do.
float minWavelength = texelWidth * OceanRenderer.Instance.MinTexelsPerWave;
if (minSpatialLength / minWavelength > 2f)
{
continue;
}
// A good match - return immediately
return(lodData);
}
// We didnt get a perfect match, but pick the next best candidate
if (lastCandidate != null)
{
return(lastCandidate);
}
else
{
return(lastPossibleCandidate);
}
}
/// <summary>
/// Returns result of GPU readback of a LOD data. Do not hold onto the returned reference across frames.
/// </summary>
/// <param name="sampleAreaXZ">The area of interest, can be 0 area.</param>
/// <param name="minSpatialLength">Min spatial length is the minimum side length that you care about. For e.g.
/// if a boat has dimensions 3m x 2m, set this to 2, and then suitable wavelengths will be preferred.</param>
protected PerLodData GetData(Rect sampleAreaXZ, float minSpatialLength)
{
PerLodData lastCandidate = null;
foreach (var gridSize_lodData in _perLodData)
{
if (!gridSize_lodData.Value._activelyBeingRendered || gridSize_lodData.Value._resultData._time == -1f)
{
continue;
}
// Check that the region of interest is covered by this data
var wdcRect = gridSize_lodData.Value._resultData._renderData.RectXZ;
// Shrink rect by 1 texel border - this is to make finite differences fit as well
float texelWidth = gridSize_lodData.Key;
wdcRect.x += texelWidth; wdcRect.y += texelWidth;
wdcRect.width -= 2f * texelWidth; wdcRect.height -= 2f * texelWidth;
if (!wdcRect.Contains(sampleAreaXZ.min) || !wdcRect.Contains(sampleAreaXZ.max))
{
continue;
}
// This data covers our required area, so store it as a potential candidate
lastCandidate = gridSize_lodData.Value;
// The smallest wavelengths should repeat no more than twice across the smaller spatial length. Unless we're
// in the last LOD - then this is the best we can do.
float minWavelength = texelWidth * OceanRenderer.Instance._minTexelsPerWave;
if (minSpatialLength / minWavelength > 2f)
{
continue;
}
// A good match - return immediately
return(gridSize_lodData.Value);
}
// We didnt get a perfect match, but pick the next best candidate
return(lastCandidate);
}
public bool PrewarmForSamplingArea(Rect areaXZ, float minSpatialLength)
{
return((_areaData = GetData(areaXZ, minSpatialLength)) != null);
}
void ProcessArrivedRequests(PerLodData lodData)
{
var requests = lodData._requests;
if (!lodData._activelyBeingRendered)
{
// Dump all requests :/. No point processing these, and we have marked the data as being invalid and don't
// want any new data coming in and stomping the valid flag.
requests.Clear();
return;
}
// Physics stuff may call update from FixedUpdate() - therefore check if this component was already
// updated this frame.
if (lodData._lastUpdateFrame == Time.frameCount)
{
return;
}
lodData._lastUpdateFrame = Time.frameCount;
// remove any failed readback requests
for (int i = 0; i < MAX_REQUESTS && requests.Count > 0; i++)
{
var request = requests.Peek();
if (request._request.hasError)
{
requests.Dequeue();
}
else
{
break;
}
}
// process current request queue
if (requests.Count > 0)
{
var request = requests.Peek();
if (request._request.done)
{
requests.Dequeue();
// Eat up any more completed requests to squeeze out latency wherever possible
ReadbackRequest nextRequest;
while (requests.Count > 0 && (nextRequest = requests.Peek())._request.done)
{
// Has error will be true if data already destroyed and is therefore unusable
if (!nextRequest._request.hasError)
{
request = nextRequest;
}
requests.Dequeue();
}
UnityEngine.Profiling.Profiler.BeginSample("Copy out readback data");
var result = lodData._resultData;
var resultLast = lodData._resultDataPrevFrame;
// copy result into resultLast
resultLast._renderData = result._renderData;
resultLast._time = result._time;
Swap(ref result._data, ref resultLast._data);
// copy new data into result
var data = request._request.GetData <ushort>();
data.CopyTo(result._data);
result._renderData = request._renderData;
result._time = request._time;
UnityEngine.Profiling.Profiler.EndSample();
}
}
}
void ProcessRequestsInternal(bool runningFromUpdate)
{
var ocean = OceanRenderer.Instance;
int lodCount = ocean.CurrentLodCount;
// When viewer changes altitude, lods will start/stop updating. Mark ones that are/arent being rendered!
for (int i = 0; i < _perLodData.KeyArray.Length; i++)
{
int lastUsableIndex = CanUseLastTwoLODs ? (lodCount - 1) : (lodCount - 3);
_perLodData.ValueArray[i]._activelyBeingRendered =
_perLodData.KeyArray[i] >= ocean._lodTransform._renderData[0]._texelWidth &&
_perLodData.KeyArray[i] <= ocean._lodTransform._renderData[lastUsableIndex]._texelWidth;
if (!_perLodData.ValueArray[i]._activelyBeingRendered)
{
// It would be cleaner to destroy these. However they contain a NativeArray with a non-negligible amount of data
// which we don't want to alloc and dealloc willy nilly, so just mark as invalid by setting time to -1.
_perLodData.ValueArray[i]._resultData._time = -1f;
_perLodData.ValueArray[i]._resultDataPrevFrame._time = -1f;
}
}
var lt = ocean._lodTransform;
for (int lodIndex = 0; lodIndex < ocean.CurrentLodCount; lodIndex++)
{
float lodTexelWidth = lt._renderData[lodIndex]._texelWidth;
// Don't add uninitialised data
if (lodTexelWidth == 0f)
{
continue;
}
if (lodTexelWidth >= _minGridSize && (lodTexelWidth <= _maxGridSize || _maxGridSize == 0f))
{
var tex = _lodComponent.DataTexture;
if (tex == null)
{
continue;
}
if (!_perLodData.ContainsKey(lodTexelWidth))
{
var resultData = new PerLodData();
resultData._resultData = new ReadbackData();
resultData._resultDataPrevFrame = new ReadbackData();
// create native arrays
Debug.Assert(_textureFormat != TexFormat.NotSet, "ReadbackLodData: Texture format must be set.", this);
var num = ((int)_textureFormat) * tex.width * tex.height;
if (!resultData._resultData._data.IsCreated || resultData._resultData._data.Length != num)
{
resultData._resultData._data = new NativeArray <ushort>(num, Allocator.Persistent);
resultData._resultDataPrevFrame._data = new NativeArray <ushort>(num, Allocator.Persistent);
}
_perLodData.Add(lodTexelWidth, resultData);
}
var lodData = _perLodData[lodTexelWidth];
if (lodData._activelyBeingRendered)
{
// Only enqueue new requests at beginning of update turns out to be a good time to sample the textures to
// ensure everything in the frame is done.
if (runningFromUpdate)
{
EnqueueReadbackRequest(tex, lodIndex, lt._renderData[lodIndex], _prevFrameTime);
}
ProcessArrivedRequests(lodData);
}
}
}
}
void ProcessRequestsInternal(bool runningFromUpdate)
{
// When viewer changes altitude, lods will start/stop updating. Mark ones that are/arent being rendered!
foreach (var gridSize_lodData in _perLodData)
{
bool CAN_USE_LAST_LOD = false;
int lastUsableIndex = CAN_USE_LAST_LOD ? (_lodComponents.Length - 1) : (_lodComponents.Length - 2);
gridSize_lodData.Value._activelyBeingRendered =
gridSize_lodData.Key >= _lodComponents[0].LodTransform._renderData._texelWidth &&
gridSize_lodData.Key <= _lodComponents[lastUsableIndex].LodTransform._renderData._texelWidth;
if (!gridSize_lodData.Value._activelyBeingRendered)
{
// It would be cleaner to destroy these. However they contain a NativeArray with a non-negligible amount of data
// which we don't want to alloc and dealloc willy nilly, so just mark as invalid by setting time to -1.
gridSize_lodData.Value._resultData._time = -1f;
gridSize_lodData.Value._resultDataPrevFrame._time = -1f;
}
}
foreach (var data in _lodComponents)
{
var lt = data.LodTransform;
if (lt._renderData._texelWidth >= _minGridSize && (lt._renderData._texelWidth <= _maxGridSize || _maxGridSize == 0f))
{
var cam = lt.GetComponent <Camera>();
if (!_perLodData.ContainsKey(lt._renderData._texelWidth))
{
var resultData = new PerLodData();
resultData._resultData = new ReadbackData();
resultData._resultDataPrevFrame = new ReadbackData();
// create native arrays
Debug.Assert(_textureFormat != TexFormat.NotSet, "ReadbackLodData: Texture format must be set.", this);
var num = ((int)_textureFormat) * cam.targetTexture.width * cam.targetTexture.height;
if (!resultData._resultData._data.IsCreated || resultData._resultData._data.Length != num)
{
resultData._resultData._data = new NativeArray <ushort>(num, Allocator.Persistent);
resultData._resultDataPrevFrame._data = new NativeArray <ushort>(num, Allocator.Persistent);
}
_perLodData.Add(lt._renderData._texelWidth, resultData);
}
var lodData = _perLodData[lt._renderData._texelWidth];
if (lodData._activelyBeingRendered)
{
// Only enqueue new requests at beginning of update turns out to be a good time to sample the textures to
// ensure everything in the frame is done.
if (runningFromUpdate)
{
EnqueueReadbackRequest(cam.targetTexture, lt._renderData, _prevFrameTime);
}
ProcessArrivedRequests(lodData);
}
}
}
}