/// <summary>
/// 在三角形图元中拾取指定位置的Point
/// </summary>
/// <param name="arg">渲染参数</param>
/// <param name="lastVertexId">三角形图元的最后一个顶点</param>
/// <param name="picker">目标Renderer</param>
/// <returns></returns>
internal override uint Search(PickingEventArgs arg, uint lastVertexId, DrawArraysPicker picker)
{
// 创建临时索引
IndexBuffer buffer = GLBuffer.Create(IndexBufferElementType.UInt, 3, BufferUsage.StaticDraw);
unsafe
{
var array = (uint *)buffer.MapBuffer(MapBufferAccess.WriteOnly);
array[0] = lastVertexId - 0;
array[1] = lastVertexId - 1;
array[2] = lastVertexId - 2;
buffer.UnmapBuffer();
}
var cmd = new DrawElementsCmd(buffer, DrawMode.Points);
// 用临时索引渲染此三角形图元（仅渲染此三角形图元）
picker.Node.Render4InnerPicking(arg, IndexAccessMode.ByFrame, cmd);
// id是拾取到的Line的Last Vertex Id
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
buffer.Dispose();
// 对比临时索引，找到那个Line
if (lastVertexId - 2 <= id && id <= lastVertexId - 0)
{
return(id);
}
else
{
throw new Exception("This should not happen!");
}
}
/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="lastVertexId"></param>
/// <param name="picker"></param>
/// <returns></returns>
internal override uint Search(PickingEventArgs arg,
uint lastVertexId, DrawArraysPicker picker)
{
IndexBuffer buffer = GLBuffer.Create(IndexBufferElementType.UInt, 4, BufferUsage.StaticDraw);
unsafe
{
var array = (uint *)buffer.MapBuffer(MapBufferAccess.WriteOnly);
array[0] = lastVertexId - 0;
array[1] = lastVertexId - 1;
array[2] = lastVertexId - 2;
array[3] = lastVertexId - 3;
buffer.UnmapBuffer();
}
var cmd = new DrawElementsCmd(buffer, DrawMode.Points);
picker.Node.Render4InnerPicking(arg, ControlMode.ByFrame, cmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
buffer.Dispose();
if (lastVertexId - 3 <= id && id <= lastVertexId - 0)
{
return(id);
}
else
{
throw new Exception("This should not happen!");
}
}
protected override void RecognizeByte(uint lastVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList, uint primitiveRestartIndex)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (byte *)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)
{
// try the loop back line.
nearestRestartIndex = i;
}
else if (value == lastVertexId &&
array[i - 1] != primitiveRestartIndex)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 1], lastVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
protected override void RecognizeUInt(uint flatColorVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList, uint primitiveRestartIndex)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (uint *)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 (((i - 1 - nearestRestartIndex) % 2 == 0) &&
(value == flatColorVertexId) &&
(array[i - 1] != primitiveRestartIndex))
{
var item = new RecognizedPrimitiveInfo(i, array[i - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
protected override void RecognizeByte(uint flatColorVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (byte *)pointer.ToPointer();
for (uint i = 1; i < length; i++)
{
var value = array[i];
if (value == flatColorVertexId)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
if (array[0] == flatColorVertexId &&
length > 1)
{
var item = new RecognizedPrimitiveInfo(0, array[length - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
indexBuffer.UnmapBuffer();
}
private IndexBuffer GetBufferInUInt(int length)
{
IndexBuffer buffer = GLBuffer.Create(IndexBufferElementType.UInt, length, BufferUsage.StaticDraw);
unsafe {
IntPtr pointer = buffer.MapBuffer(MapBufferAccess.WriteOnly);
var array = (uint *)pointer;
for (int i = 0; i < model.indexes.Length; i++)
{
array[i] = model.indexes[i];
}
buffer.UnmapBuffer();
}
return(buffer);
}
protected override void RecognizeUShort(uint flatColorVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList, uint primitiveRestartIndex)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
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)
{
// try the loop back line.
if (array[nearestRestartIndex + 1] == flatColorVertexId &&
array[i - 1] != primitiveRestartIndex &&
nearestRestartIndex + 1 < i - 1)
{
var item = new RecognizedPrimitiveInfo((uint)(nearestRestartIndex + 1), value, flatColorVertexId);
primitiveInfoList.Add(item);
}
nearestRestartIndex = i;
}
else if (value == flatColorVertexId &&
array[i - 1] != primitiveRestartIndex)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
if (array[nearestRestartIndex + 1] == flatColorVertexId &&
array[length - 1] != primitiveRestartIndex &&
nearestRestartIndex + 1 < length - 1)
{
var item = new RecognizedPrimitiveInfo((uint)(nearestRestartIndex + 1), array[length - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
indexBuffer.UnmapBuffer();
}
/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="flatColorVertexId"></param>
/// <param name="picker"></param>
/// <returns></returns>
internal override uint[] Search(PickingEventArgs arg,
uint flatColorVertexId, DrawArraysPicker picker)
{
IndexBuffer buffer = GLBuffer.Create(IndexBufferElementType.UInt, 8, BufferUsage.StaticDraw);
unsafe
{
var array = (uint *)buffer.MapBuffer(MapBufferAccess.WriteOnly);
array[0] = flatColorVertexId - 0; array[1] = flatColorVertexId - 2;
array[2] = flatColorVertexId - 2; array[3] = flatColorVertexId - 3;
array[4] = flatColorVertexId - 3; array[5] = flatColorVertexId - 1;
array[6] = flatColorVertexId - 1; array[7] = flatColorVertexId - 0;
buffer.UnmapBuffer();
}
var cmd = new DrawElementsCmd(buffer, DrawMode.Lines);
picker.Node.Render4InnerPicking(arg, IndexAccessMode.ByFrame, cmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
buffer.Dispose();
if (id + 2 == flatColorVertexId)
{
return(new uint[] { flatColorVertexId - 0, flatColorVertexId - 2, });
}
else if (id + 3 == flatColorVertexId)
{
return(new uint[] { flatColorVertexId - 2, flatColorVertexId - 3 });
}
else if (id + 1 == flatColorVertexId)
{
return(new uint[] { flatColorVertexId - 3, flatColorVertexId - 1, });
}
else if (id + 0 == flatColorVertexId)
{
return(new uint[] { flatColorVertexId - 1, flatColorVertexId - 0, });
}
else
{
throw new Exception("This should not happen!");
}
}
protected override void RecognizeUShort(uint lastVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList, uint primitiveRestartIndex)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (ushort *)pointer.ToPointer();
for (uint i = 0; i < length; i++)
{
var value = array[i];
if (value == lastVertexId)
{
var item = new RecognizedPrimitiveInfo(i, value);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
protected override void RecognizeByte(uint singleNodeVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (byte *)pointer.ToPointer();
uint i = 0;
for (i = i + 4; i < length; i += 6)
{
var value = array[i];
if (value == singleNodeVertexId)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 4], array[i - 2], singleNodeVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
protected override void RecognizeUShort(uint flatColorVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (ushort *)pointer.ToPointer();
uint i = 0;
for (i = i + 2; i < length; i += 4)
{
var value = array[i];
if (value == flatColorVertexId)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 1], flatColorVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
private IndexBuffer GetBufferInBytes(int length)
{
IndexBuffer buffer = GLBuffer.Create(IndexBufferElementType.UByte, length, BufferUsage.StaticDraw);
unsafe {
IntPtr pointer = buffer.MapBuffer(MapBufferAccess.WriteOnly);
var array = (byte *)pointer;
for (int i = 0; i < model.indexes.Length; i++)
{
if (model.indexes[i] == uint.MaxValue)
{
array[i] = byte.MaxValue;
}
else
{
array[i] = (byte)model.indexes[i];
}
}
buffer.UnmapBuffer();
}
return(buffer);
}
protected override void RecognizeUInt(uint lastVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (uint *)pointer.ToPointer();
uint i = 0;
for (i = i + 3; i < length; i++)
{
var value = array[i];
if (value == lastVertexId &&
(i - 3) % 4 == 0)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 3], array[i - 2], array[i - 1], lastVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}
protected override void RecognizeByte(uint lastVertexId, DrawElementsCmd cmd, List <RecognizedPrimitiveInfo> primitiveInfoList)
{
IndexBuffer indexBuffer = cmd.IndexBufferObject;
int length = indexBuffer.Length;
IntPtr pointer = indexBuffer.MapBuffer(MapBufferAccess.ReadOnly);
unsafe
{
var array = (byte *)pointer.ToPointer();
//long nearestRestartIndex = -1;
uint i = 0;
for (i = i + 2; i < length; i += 3)
{
var value = array[i];
if (value == lastVertexId)
//&& (i - nearestRestartIndex) % 3 == 0)
{
var item = new RecognizedPrimitiveInfo(i, array[i - 2], array[i - 1], lastVertexId);
primitiveInfoList.Add(item);
}
}
}
indexBuffer.UnmapBuffer();
}