// update mesh cache
void UpdateMeshCache()
{
if (Time.realtimeSinceStartup < lastUpdateCacheTime + 1.0f)
{
return;
}
lastUpdateCacheTime = Time.realtimeSinceStartup;
const float maxStayTime = 30.0f; // 30s
List <int> rmList = new List <int>();
foreach (DictionaryEntry de in meshTable)
{
QuadtreeMesh mesh = de.Value as QuadtreeMesh;
if (Time.realtimeSinceStartup > mesh.ts + maxStayTime)
{
mesh.Destroy();
rmList.Add((int)de.Key);
}
}
foreach (int nodeIndex in rmList)
{
meshTable.Remove(nodeIndex);
}
}
// request a node's mesh
public bool RequestNodeMesh(int nodeIndex)
{
Debug.Assert(nodeIndex >= 0);
// Check in mesh cache
QuadtreeMesh mesh = meshTable[nodeIndex] as QuadtreeMesh;
if (mesh != null)
{
// update time stamp
mesh.ts = Time.realtimeSinceStartup;
return(true);
}
// Single thread loading
mesh = CreateNodeMesh(nodeIndex);
if (mesh != null)
{
// Push to table
meshTable.Add(nodeIndex, mesh);
return(true);
}
else
{
Debug.Assert(mesh != null);
return(false);
}
}
QuadtreeMesh CreateNodeMesh(int nodeIndex)
{
try
{
QtreeNode node = terrain.qtree.GetQtreeNode(nodeIndex);
int rowVertNum = terrain.vertexNumInNodeRow;
int numVert = rowVertNum * rowVertNum;
// Prepare temporary buffers
if (tempVertNum != numVert)
{
// In fact, except the first time, the code should never run into here,
// for all quadtree nodes should have same number of vertex in their inborn LOD mesh
tempVerts = new VertexBuffer(numVert);
tempVertNum = numVert;
}
int gridSize = terrain.gridSize;
float miny = 0.0f;
float maxy = 0.0f;
// Get mesh from height blender
if (!terrain.gemBuilder.BuildQTreeNodeMesh(node.hmLeft, node.hmTop, node.gridStep,
rowVertNum, gridSize, tempVerts, out miny, out maxy))
{
Debug.Assert(false);
return(null);
}
// calculate mesh's aabb in local space
Rect rcLocal = node.CalcLocalArea(terrain.gridSize);
Vector3 mins = new Vector3(rcLocal.xMin, miny, rcLocal.yMin);
Vector3 maxs = new Vector3(rcLocal.xMax, maxy, rcLocal.yMax);
// Create mesh object
QuadtreeMesh nodeMesh = new QuadtreeMesh(terrain, nodeIndex, mins, maxs)
{
ts = Time.realtimeSinceStartup,
};
// Create height map
nodeMesh.heights = new float[numVert];
for (int i = 0; i < numVert; i++)
{
nodeMesh.heights[i] = tempVerts.verts[i].pos.y;
}
// Create vertex buffer
nodeMesh.CreateVertCB(tempVerts);
return(nodeMesh);
}
catch
{
Debug.LogFormat("Failed to create node mesh {0}", nodeIndex);
return(null);
}
}
// Get mesh for a quadtree node
public QuadtreeMesh GetNodeMesh(int nodeIndex)
{
Debug.Assert(nodeIndex >= 0);
QuadtreeMesh mesh = meshTable[nodeIndex] as QuadtreeMesh;
return(mesh);
}
void CollectRenderNodes_r(int nodeIndex)
{
QtreeNode node = nodeBuf[nodeIndex];
// Only render node whose info is up-to-date
if (node.updateCnt != updateCnt)
{
// If a node isn't up-to-date, all it's children must not be.
return;
}
// do camera cull with node's AABB at first, but node may not have min-y and max-y
// at this moment if it's mesh wasn't built, so now we only do a conservative check
// with x and z axis.
// NOTE: we ONLY consider tranlation of terrain, but not rotation and scale
Vector3 offset = terrain.transform.position;
Rect rcLocal = node.CalcLocalArea(terrain.gridSize);
Vector3 mins = new Vector3(rcLocal.xMin + offset.x, -10000.0f, rcLocal.yMin + offset.z);
Vector3 maxs = new Vector3(rcLocal.xMax + offset.x, 10000.0f, rcLocal.yMax + offset.z);
Bounds aabb = new Bounds();
aabb.SetMinMax(mins, maxs);
if (!GeometryUtility.TestPlanesAABB(camPlanes, aabb))
{
return; // The whole node isn't visible
}
if (node.meshState == (byte)eNodeMeshState.LOAD_INBORN ||
node.meshState == (byte)eNodeMeshState.LOD_GRADEUP)
{
// Get index buffer according to neighbour's LOD grade
int sideMask = 0;
for (int i = 0; i < 4; i++)
{
if (node.neighbour[i] < 0)
{
continue;
}
QtreeNode neighbour = nodeBuf[node.neighbour[i]];
if (neighbour.updateCnt == updateCnt && neighbour.areaLOD > node.areaLOD)
{
sideMask |= (1 << i);
}
}
// This node's may be drawn
ComputeBuffer _vertCB = null;
ComputeBuffer _indexCB = null;
QuadtreeMesh nodeMesh = null;
if (node.meshState == (byte)eNodeMeshState.LOAD_INBORN)
{
nodeMesh = terrain.meshMan.GetNodeMesh(nodeIndex);
if (nodeMesh != null)
{
_vertCB = nodeMesh.vertCB;
_indexCB = terrain.trnRes.GetNodeIndexCB(sideMask, -1);
}
}
else if (node.meshState == (byte)eNodeMeshState.LOD_GRADEUP)
{
// LOD grade-up rendering, use parent's mesh
Debug.Assert(node.parent >= 0);
nodeMesh = terrain.meshMan.GetNodeMesh(node.parent);
if (nodeMesh != null)
{
_vertCB = nodeMesh.vertCB;
_indexCB = terrain.trnRes.GetNodeIndexCB(sideMask, node.childPos);
}
}
if (_vertCB != null && _indexCB != null)
{
// do camera cull again with more precise aabb
mins.y = nodeMesh.aabb.min.y + offset.y;
maxs.y = nodeMesh.aabb.max.y + offset.y;
aabb.SetMinMax(mins, maxs);
if (!GeometryUtility.TestPlanesAABB(camPlanes, aabb))
{
return; // The whole node isn't visible
}
// Push node to rendering collector
DRAWDATA drawData = new DRAWDATA()
{
node = node,
nodeAABB = aabb,
vertCB = _vertCB,
indexCB = _indexCB,
};
curRenderer.PushDrawData(drawData);
}
}
if (!node.IsLeaf())
{
// Go on for children
for (int i = 0; i < 4; i++)
{
CollectRenderNodes_r(node.children[i]);
}
}
}