/// <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!");
}
}
public IEnumerable <IDrawCommand> GetDrawCommand()
{
if (this.drawCmd == null)
{
int uCount = GetUCount(interval);
DrawArraysCmd buffer = new DrawArraysCmd(DrawMode.Points, 0, uCount);
this.drawCmd = buffer;
}
yield return(this.drawCmd);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public IEnumerable <IDrawCommand> GetDrawCommand()
{
if (this.drawCmd == null)
{
var drawCmd = new DrawArraysCmd(DrawMode.Quads, this.Capacity * 4);
// note: use IDrawCommand.Draw(ControlMode.Random) to enable this property.
drawCmd.VertexCount = 0;
this.drawCmd = drawCmd;
}
yield return(this.drawCmd);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public IEnumerable <IDrawCommand> GetDrawCommand()
{
if (this.drawCmd == null)
{
int primCount = 1;
int frameCount = 1;
var drawCmd = new DrawArraysCmd(DrawMode.Quads, 0, this.Capacity * 4, primCount, frameCount);
// note: use ZeroIndexBuffer.Draw(ControlMode.Random) to enable this property.
drawCmd.RenderingVertexCount = 0;
this.drawCmd = drawCmd;
}
yield return(this.drawCmd);
}
/// <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="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!");
}
}
public ZeroIndexBufferController(DrawArraysCmd drawCmd)
{
this.drawCmd = drawCmd;
}
/// <summary>
/// Get picked geometry from a <see cref="PickableNode"/> with <see cref="DrawArraysCmd"/> as index buffer.
/// </summary>
/// <param name="node"></param>
/// <param name="positionBuffer"></param>
/// <param name="drawCommand"></param>
public DrawArraysPicker(PickableNode node, VertexBuffer positionBuffer, DrawArraysCmd drawCommand)
: base(node, positionBuffer)
{
this.DrawCommand = drawCommand;
}
