//public SharedBlockIndexData GetSharedIndexData(int terrEdgeSize)
//{
// SharedBlockIndexData result;
// if (!sharedIBCache.TryGetValue(terrEdgeSize, out result ))
// {
// result = new SharedBlockIndexData(renderSystem, terrEdgeSize);
// sharedIBCache.Add(terrEdgeSize, result);
// }
// return result;
//}
/// <summary>
/// Create a terrain mesh at the given tile-based coordinate and with a given size.
/// </summary>
/// <param name="rs"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="size">The size can be either 33 or 17</param>
/// <returns></returns>
public ResourceHandle <TerrainMesh> CreateInstance(RenderSystem rs, int x, int y, int size)
{
if (!loaded)
{
lock (syncHelper)
{
if (!loaded)
{
loaded = true;
renderSystem = rs;
index33 = new SharedIndexData(rs, 33);
index17 = new SharedIndexData(rs, 17);
//SharedBlockIndexData sharedIdxBuffer1025 = new SharedBlockIndexData(rs, 513);
//SharedBlockIndexData sharedIdxBuffer257 = new SharedBlockIndexData(rs, 129);
//SharedBlockIndexData sharedIdxBuffer65 = new SharedBlockIndexData(rs, 33);
//sharedIBCache.Add(513, sharedIdxBuffer1025);
//sharedIBCache.Add(129, sharedIdxBuffer257);
//sharedIBCache.Add(33, sharedIdxBuffer65);
}
}
}
Resource retrived = base.Exists(TerrainMesh.GetHashString(x, y, size));
if (retrived == null)
{
TerrainMesh mdl = new TerrainMesh(rs, x, y, size);
retrived = mdl;
base.NotifyResourceNew(mdl);
}
//else
//{
// retrived.Use();
//}
return(new ResourceHandle <TerrainMesh>((TerrainMesh)retrived));
}
//public SharedBlockIndexData GetSharedIndexData(int terrEdgeSize)
//{
// SharedBlockIndexData result;
// if (!sharedIBCache.TryGetValue(terrEdgeSize, out result ))
// {
// result = new SharedBlockIndexData(renderSystem, terrEdgeSize);
// sharedIBCache.Add(terrEdgeSize, result);
// }
// return result;
//}
/// <summary>
/// Create a terrain mesh at the given tile-based coordinate and with a given size.
/// </summary>
/// <param name="rs"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="size">The size can be either 33 or 17</param>
/// <returns></returns>
public ResourceHandle<TerrainMesh> CreateInstance(RenderSystem rs, int x, int y, int size)
{
if (!loaded)
{
lock (syncHelper)
{
if (!loaded)
{
loaded = true;
renderSystem = rs;
index33 = new SharedIndexData(rs, 33);
index17 = new SharedIndexData(rs, 17);
//SharedBlockIndexData sharedIdxBuffer1025 = new SharedBlockIndexData(rs, 513);
//SharedBlockIndexData sharedIdxBuffer257 = new SharedBlockIndexData(rs, 129);
//SharedBlockIndexData sharedIdxBuffer65 = new SharedBlockIndexData(rs, 33);
//sharedIBCache.Add(513, sharedIdxBuffer1025);
//sharedIBCache.Add(129, sharedIdxBuffer257);
//sharedIBCache.Add(33, sharedIdxBuffer65);
}
}
}
Resource retrived = base.Exists(TerrainMesh.GetHashString(x, y, size));
if (retrived == null)
{
TerrainMesh mdl = new TerrainMesh(rs, x, y, size);
retrived = mdl;
base.NotifyResourceNew(mdl);
}
//else
//{
// retrived.Use();
//}
return new ResourceHandle<TerrainMesh>((TerrainMesh)retrived);
}
/// <summary>
/// This implements the method in resource, to load the mesh data(vertex buffer, index buffer)
/// of this terrain tile.
/// </summary>
protected override void load()
{
// 读取地形数据
// This line will load the terrain data in this tile.
float[] data = TerrainData.Instance.GetData(tileX, tileY, terrEdgeSize);
float radtc = MathEx.Degree2Radian(tileCol);
float radtl = MathEx.Degree2Radian(tileLat);
float radSpan = MathEx.Degree2Radian(10);
int vertexCount = terrEdgeSize * terrEdgeSize;
int terrEdgeLen = terrEdgeSize - 1;
if (terrEdgeSize == 33)
{
material.SetEffect(EffectManager.Instance.GetModelEffect(TerrainEffect33Factory.Name));
}
else
{
material.SetEffect(EffectManager.Instance.GetModelEffect(TerrainEffect17Factory.Name));
}
#region 顶点数据
vtxDecl = factory.CreateVertexDeclaration(TerrainVertex.Elements);
vtxBuffer = factory.CreateVertexBuffer(vertexCount, vtxDecl, BufferUsage.WriteOnly);
TerrainVertex[] vtxArray = new TerrainVertex[vertexCount];
float cellAngle = radSpan / (float)terrEdgeLen;
#region 计算顶点坐标
// Caluclate the position of each vertex
// i为纬度方向
// i is in the latitude direction
for (int i = 0; i < terrEdgeSize; i++)
{
// j为经度方向
// j is in the longitude direction
for (int j = 0; j < terrEdgeSize; j++)
{
Vector3 pos = PlanetEarth.GetPosition(radtc + j * cellAngle, radtl - i * cellAngle);
int index = i * terrEdgeSize + j;
// 计算海拔高度
// calculate the elevation
float height = (data[index] - TerrainMeshManager.PostZeroLevel) * TerrainMeshManager.PostHeightScale;
//if (height > 0)
//{
// height = (height - 0) * TerrainMeshManager.PostHeightScale;
//}
//else
//{
// height *= TerrainMeshManager.PostHeightScale;
// height -= 10;
// //if (height < -30)
// // height = -30;
//}
Vector3 normal = pos;
normal.Normalize();
vtxArray[index].Position = pos + normal * height;
// this index is used to generate detailed texture coordinate in vertex shader
vtxArray[index].Index = index;
// map the texture coordinate for global texturing
float curCol = radtc + j * cellAngle;
float curLat = radSpan + radtl - i * cellAngle;
curCol += MathEx.PIf;
curLat -= MathEx.Degree2Radian(10);
vtxArray[index].u = 0.5f * curCol / MathEx.PIf;
vtxArray[index].v = (-curLat + MathEx.PiOver2) / MathEx.PIf;
}
}
#endregion
#endregion
#region 索引数据
SharedIndexData sindexData = TerrainMeshManager.Instance.GetIndexData(terrEdgeSize);
indexBuffer = sindexData.Index;
#endregion
#region 构造GeomentryData
defGeometryData = new GeomentryData();
defGeometryData.VertexDeclaration = vtxDecl;
defGeometryData.VertexSize = TerrainVertex.Size;
defGeometryData.VertexBuffer = vtxBuffer;
defGeometryData.IndexBuffer = indexBuffer;
defGeometryData.PrimCount = indexBuffer.IndexCount / 3;
defGeometryData.VertexCount = terrEdgeSize * terrEdgeSize;
defGeometryData.PrimitiveType = RenderPrimitiveType.TriangleList;
defGeometryData.BaseVertex = 0;
#endregion
vtxBuffer.SetData <TerrainVertex>(vtxArray);
}