protected override void RecognizeByte(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList, uint primitiveRestartIndex)
{
int length = oneIndexBufferPtr.Length;
unsafe
{
var array = (byte*)pointer.ToPointer();
long nearestRestartIndex = -1;
uint i = 0;
while (i < length && array[i] == primitiveRestartIndex)
{ nearestRestartIndex = i; i++; }
for (i = i + 2; i < length; i++)
{
var value = array[i];
if (value == primitiveRestartIndex)
{
// try the loop back line.
nearestRestartIndex = i;
}
else if (value == lastVertexId
&& array[i - 1] != primitiveRestartIndex
&& array[nearestRestartIndex + 1] != primitiveRestartIndex
&& nearestRestartIndex + 2 < i)
{
var item = new RecognizedPrimitiveIndex(lastVertexId, i);
item.IndexIdList.Add(array[nearestRestartIndex + 1]);
item.IndexIdList.Add(array[i - 1]);
item.IndexIdList.Add(value);
lastIndexIdList.Add(item);
}
}
}
}
internal override uint[] Search(RenderEventArgs arg,
int x, int y,
uint lastVertexId, ZeroIndexRenderer modernRenderer)
{
OneIndexBufferPtr indexBufferPtr = null;
using (var buffer = new OneIndexBuffer(IndexElementType.UInt, DrawMode.Lines, BufferUsage.StaticDraw))
{
buffer.Create(6);
unsafe
{
var array = (uint *)buffer.Header.ToPointer();
array[0] = lastVertexId - 2; array[1] = lastVertexId - 0;
array[2] = lastVertexId - 4; array[3] = lastVertexId - 2;
array[4] = lastVertexId - 0; array[5] = lastVertexId - 4;
}
indexBufferPtr = buffer.GetBufferPtr() as OneIndexBufferPtr;
}
modernRenderer.Render4InnerPicking(arg, indexBufferPtr);
uint id = ColorCodedPicking.ReadPixel(x, arg.CanvasRect.Height - y - 1);
indexBufferPtr.Dispose();
if (id + 4 == lastVertexId)
{
return(new uint[] { id + 4, id, });
}
else
{
return(new uint[] { id - 2, id, });
}
}
protected override void RecognizeUInt(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList, uint primitiveRestartIndex)
{
int length = oneIndexBufferPtr.Length;
unsafe
{
var array = (uint*)pointer.ToPointer();
for (uint i = 0; i < length; i++)
{
var value = array[i];
if (value == lastVertexId)
{
var item = new RecognizedPrimitiveIndex(lastVertexId, i);
item.IndexIdList.Add(value);
lastIndexIdList.Add(item);
}
}
}
}
protected override void RecognizeByte(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList)
{
int length = oneIndexBufferPtr.Length;
unsafe
{
var array = (byte*)pointer.ToPointer();
uint i = 0;
for (i = i + 2; i < length; i++)
{
var value = array[i];
if (value == lastVertexId)
{
var item = new RecognizedPrimitiveIndex(lastVertexId, i);
item.IndexIdList.Add(array[0]);
item.IndexIdList.Add(array[i - 1]);
item.IndexIdList.Add(value);
lastIndexIdList.Add(item);
}
}
}
}
/// <summary>
/// 识别出以<see cref="lastVertexId"/>结尾的图元。
/// </summary>
/// <param name="lastVertexId"></param>
/// <param name="pointer"></param>
/// <param name="oneIndexBufferPtr"></param>
/// <returns></returns>
public List<RecognizedPrimitiveIndex> Recognize(
uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr)
{
var lastIndexIdList = new List<RecognizedPrimitiveIndex>();
switch (oneIndexBufferPtr.Type)
{
case IndexElementType.UnsignedByte:
RecognizeByte(lastVertexId, pointer, oneIndexBufferPtr, lastIndexIdList);
break;
case IndexElementType.UnsignedShort:
RecognizeUShort(lastVertexId, pointer, oneIndexBufferPtr, lastIndexIdList);
break;
case IndexElementType.UnsignedInt:
RecognizeUInt(lastVertexId, pointer, oneIndexBufferPtr, lastIndexIdList);
break;
default:
throw new NotImplementedException();
}
return lastIndexIdList;
}
protected override void RecognizeUInt(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList)
{
int length = oneIndexBufferPtr.Length;
unsafe
{
var array = (uint*)pointer.ToPointer();
long nearestRestartIndex = -1;
uint i = 0;
for (i = i + 2; i < length; i++)
{
var value = array[i];
if (value == lastVertexId
&& (i - nearestRestartIndex) % 3 == 0)
{
var item = new RecognizedPrimitiveIndex(lastVertexId, i);
item.IndexIdList.Add(array[i - 2]);
item.IndexIdList.Add(array[i - 1]);
item.IndexIdList.Add(value);
lastIndexIdList.Add(item);
}
}
}
}
public OneIndexBufferPtrController(OneIndexBufferPtr ptr)
{
// TODO: Complete member initialization
this.ptr = ptr;
}
protected override void RecognizeUShort(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList, uint primitiveRestartIndex)
{
int length = oneIndexBufferPtr.Length;
unsafe
{
var array = (ushort*)pointer.ToPointer();
long nearestRestartIndex = -1;
uint i = 0;
while (i < length && array[i] == primitiveRestartIndex)
{ nearestRestartIndex = i; i++; }
for (i = i + 1; i < length; i++)
{
var value = array[i];
if (value == primitiveRestartIndex)
{
nearestRestartIndex = i;
}
else if (value == lastVertexId
&& array[i - 1] != primitiveRestartIndex
&& (i - nearestRestartIndex) % 2 == 0)
{
var item = new RecognizedPrimitiveIndex(lastVertexId, i);
item.IndexIdList.Add(array[i - 1]);
item.IndexIdList.Add(value);
lastIndexIdList.Add(item);
}
}
}
}
/// <summary>
/// 将共享点前移，然后重新渲染、拾取
/// </summary>
/// <param name="recognizedPrimitiveIndex0"></param>
/// <param name="recognizedPrimitiveIndex1"></param>
/// <param name="drawMode"></param>
/// <param name="oneIndexBufferPtr"></param>
/// <param name="lastIndex0"></param>
/// <param name="lastIndex1"></param>
private void AssembleIndexBuffer(
RecognizedPrimitiveIndex recognizedPrimitiveIndex0,
RecognizedPrimitiveIndex recognizedPrimitiveIndex1,
DrawMode drawMode,
out OneIndexBufferPtr oneIndexBufferPtr,
out uint lastIndex0, out uint lastIndex1)
{
List<uint> indexArray = ArrangeIndexes(
recognizedPrimitiveIndex0, recognizedPrimitiveIndex1, drawMode,
out lastIndex0, out lastIndex1);
if (indexArray.Count !=
recognizedPrimitiveIndex0.IndexIdList.Count
+ 1
+ recognizedPrimitiveIndex1.IndexIdList.Count)
{ throw new Exception(); }
using (var indexBuffer = new OneIndexBuffer<uint>(drawMode, BufferUsage.StaticDraw))
{
indexBuffer.Alloc(
recognizedPrimitiveIndex0.IndexIdList.Count
+ 1
+ recognizedPrimitiveIndex1.IndexIdList.Count);
unsafe
{
var array = (uint*)indexBuffer.Header.ToPointer();
for (int i = 0; i < indexArray.Count; i++)
{
array[i] = indexArray[i];
}
}
oneIndexBufferPtr = indexBuffer.GetBufferPtr() as OneIndexBufferPtr;
}
}
public OneIndexBufferPtrController(OneIndexBufferPtr ptr)
{
// TODO: Complete member initialization
this.ptr = ptr;
}
protected abstract void RecognizeUShort(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList, uint primitiveRestartIndex);
protected abstract void RecognizeUInt(uint lastVertexId, IntPtr pointer, OneIndexBufferPtr oneIndexBufferPtr, List<RecognizedPrimitiveIndex> lastIndexIdList);
