/// <summary>
///
/// </summary>
/// <param name="arg"></param>
/// <param name="singleNodeVertexId"></param>
/// <param name="stageVertexId"></param>
/// <param name="picker"></param>
/// <returns></returns>
internal override uint Search(PickingEventArgs arg,
uint singleNodeVertexId, uint stageVertexId, DrawArraysPicker picker)
{
var array = new uint[]
{
singleNodeVertexId - 0,
singleNodeVertexId - 1,
singleNodeVertexId - 2
};
IndexBuffer buffer = array.GenIndexBuffer(BufferUsage.StaticDraw);
var cmd = new DrawElementsCmd(buffer, DrawMode.Points);
picker.Node.Render4InnerPicking(arg, cmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
buffer.Dispose();
if (stageVertexId - 2 <= id && id <= stageVertexId - 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!");
}
}
/// <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="singleNodeVertexId"></param>
/// <param name="stageVertexId"></param>
/// <param name="picker"></param>
/// <returns></returns>
internal override uint[] Search(PickingEventArgs arg,
uint singleNodeVertexId, uint stageVertexId, DrawArraysPicker picker)
{
var cmd = picker.DrawCommand as DrawArraysCmd;
// when the temp index buffer could be long, it's no longer needed.
// what a great OpenGL API design!
DrawArraysCmd drawCmd = new DrawArraysCmd(DrawMode.LineLoop, cmd.MaxVertexCount, cmd.FirstVertex, cmd.VertexCount);
picker.Node.Render4InnerPicking(arg, drawCmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
uint baseId = stageVertexId - singleNodeVertexId;
if (id == baseId + cmd.FirstVertex)
{
return(new uint[] { (uint)(baseId + cmd.FirstVertex + cmd.VertexCount - 1), id, });
}
else if (baseId + cmd.FirstVertex < id && id <= (uint)(baseId + cmd.FirstVertex + cmd.VertexCount - 1))
{
return(new uint[] { id - 1, id, });
}
else
{
throw new Exception("This should not happen!");
}
}
/// <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)
{
var cmd = picker.DrawCommand as DrawArraysCmd;
// when the temp index buffer could be long, it's no longer needed.
// what a great OpenGL API design!
var drawCmd = new DrawArraysCmd(DrawMode.Points, cmd.MaxVertexCount, cmd.FirstVertex, cmd.VertexCount);
picker.Node.Render4InnerPicking(arg, drawCmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
if (cmd.FirstVertex <= id && id < cmd.FirstVertex + cmd.VertexCount)
{
return(id);
}
else
{
throw new Exception("This should not happen!");
}
}
/// <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!");
}
}
/// <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)
{
var zeroIndexBuffer = picker.DrawCommand as DrawArraysCmd;
// when the temp index buffer could be long, it's no longer needed.
// what a great OpenGL API design!
var drawCmd = new DrawArraysCmd(DrawMode.Points, zeroIndexBuffer.FirstVertex, zeroIndexBuffer.RenderingVertexCount, zeroIndexBuffer.InstanceCount);
picker.Node.Render4InnerPicking(arg, IndexAccessMode.ByFrame, drawCmd);
uint id = ColorCodedPicking.ReadStageVertexId(arg.X, arg.Y);
if (zeroIndexBuffer.FirstVertex <= id &&
id < zeroIndexBuffer.FirstVertex + zeroIndexBuffer.RenderingVertexCount)
{
return(id);
}
else
{
throw new Exception("This should not happen!");
}
}
/// <summary>
/// 在三角形图元中拾取指定位置的Line
/// </summary>
/// <param name="arg"></param>
/// <param name="singleNodeVertexId">三角形图元的最后一个顶点</param>
/// <param name="stageVertexId"></param>
/// <param name="picker"></param>
/// <returns></returns>
internal override uint[] Search(PickingEventArgs arg,
uint singleNodeVertexId, uint stageVertexId, DrawArraysPicker picker)
{
// 创建临时索引
var array = new uint[]
{
singleNodeVertexId - 1, singleNodeVertexId - 0,
singleNodeVertexId - 2, singleNodeVertexId - 1,
singleNodeVertexId - 0, singleNodeVertexId - 2
};
IndexBuffer buffer = array.GenIndexBuffer(BufferUsage.StaticDraw);
var cmd = new DrawElementsCmd(buffer, DrawMode.Lines);
// 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, 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 (id + 2 == stageVertexId)
{
return(new uint[] { id + 2, id, });
}
else if (id + 1 == stageVertexId)
{
return(new uint[] { id - 1, id, });
}
else if (id + 0 == stageVertexId)
{
return(new uint[] { id - 1, id, });
}
else
{
throw new Exception("This should not happen!");
}
}