//private readonly IBufferSource model;
/// <summary>
/// Scene node that supports 'Color-Coded-Picking'.
/// </summary>
///<param name="model">Only <see cref="DrawArraysCmd"/> and <see cref="DrawElementsCmd"/> are supported as <see cref="IDrawCommand"/>.</param>
/// <param name="positionNameInIBufferSource">The 'in' variable name which represents position buffer vertex shader.</param>
///<param name="builders"></param>
public PickableNode(IBufferSource model, string positionNameInIBufferSource, params RenderMethodBuilder[] builders)
: base(model, builders)
{
var pickProgramProvider = PickingShaderHelper.GetPickingShaderProgramProvider();
this.pickingRenderUnitBuilder = new IPickableRenderMethodBuilder(pickProgramProvider, positionNameInIBufferSource);
}
/// <summary>
/// 支持"拾取"的渲染器
/// </summary>
/// <param name="model">一种渲染方式</param>
/// <param name="renderProgramProvider">各种类型的shader代码</param>
/// <param name="attributeMap">关联<paramref name="model"/>和<paramref name="shaderProgramProvider"/>中的属性</param>
/// <param name="positionNameInVertexShader">vertex shader种描述顶点位置信息的in变量的名字</param>
///<param name="switches"></param>
public PickableRenderer(IBufferable model, IShaderProgramProvider renderProgramProvider,
AttributeMap attributeMap, string positionNameInVertexShader,
params GLState[] switches)
{
this.PositionNameInVertexShader = positionNameInVertexShader;
this.pickProgramProvider = PickingShaderHelper.GetPickingShaderProgramProvider();
this.DataSource = model;
this.renderProgramProvider = renderProgramProvider;
this.attributeMap = attributeMap;
this.stateList.AddRange(switches);
}
/// <summary>
/// 根据<see cref="IndexBuffer"/>的具体类型获取一个<see cref="PickableRenderer"/>
/// </summary>
/// <param name="model"></param>
/// <param name="attributeMap"></param>
/// <param name="positionNameInIBufferable"></param>
/// <param name="switches"></param>
/// <returns></returns>
public static InnerPickableRenderer GetRenderer(
this IBufferable model,
AttributeMap attributeMap,
string positionNameInIBufferable,
params GLState[] switches)
{
if (model == null || attributeMap == null || string.IsNullOrEmpty(positionNameInIBufferable))
{
throw new ArgumentNullException();
}
AttributeMap map = null;
foreach (AttributeMap.NamePair item in attributeMap)
{
if (item.NameInIBufferable == positionNameInIBufferable)
{
map = new AttributeMap();
map.Add(item.VarNameInShader, item.NameInIBufferable);
break;
}
}
if (map == null)
{
throw new Exception(string.Format("No matching variable name in shader for [{0}]", positionNameInIBufferable));
}
if (model.UsesZeroIndexBuffer())
{
return(new ZeroIndexRenderer(model, PickingShaderHelper.GetPickingShaderProgramProvider(), map, positionNameInIBufferable, switches));
}
else
{
return(new OneIndexRenderer(model, PickingShaderHelper.GetPickingShaderProgramProvider(), map, positionNameInIBufferable, switches));
}
}