/// <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.GetShaderCodes(), map, positionNameInIBufferable, switches));
}
else
{
return(new OneIndexRenderer(model, PickingShaderHelper.GetShaderCodes(), map, positionNameInIBufferable, switches));
}
}
