public IVertexArray GetGlVao()
{
if (!dirty)
{
return(glVertexArray);
}
if (glVertexArray == null)
{
glVertexArray = infra.GlContext.Create.VertexArray();
}
glVertexArray.DisableVertexAttributesStartingFrom(0);
var indexOfPosition = vertexSet.ElementInfos.IndexOf(x => x.CommonSemantic == CommonVertexSemantic.Position);
var indexOfNormal = vertexSet.ElementInfos.IndexOf(x => x.CommonSemantic == CommonVertexSemantic.Normal);
var indexOfTexCoord = vertexSet.ElementInfos.IndexOf(x => x.CommonSemantic == CommonVertexSemantic.TexCoord);
if (indexOfPosition.HasValue)
{
SetVertexAttrF(0, indexOfPosition.Value, VertexAttributeDimension.Three, VertexAttribPointerType.Float);
}
if (indexOfNormal.HasValue)
{
SetVertexAttrF(1, indexOfNormal.Value, VertexAttributeDimension.Three, VertexAttribPointerType.Float);
}
if (indexOfTexCoord.HasValue)
{
SetVertexAttrF(2, indexOfTexCoord.Value, VertexAttributeDimension.Two, VertexAttribPointerType.Float);
}
if (vertexSet.IndicesInfo != null)
{
var arraySubrange = vertexSet.ArraySubranges[vertexSet.IndicesInfo.ArrayIndex];
var rawDataRes = arraySubrange.RawDataResource;
var arrayCache = rawDataRes.CacheContainer.GetOrAddCache(Tuples.Pair(infra, rawDataRes), x => new RawDataResCache(x.First, x.Second));
var glBuffer = arrayCache.GetGlIndexBuffer(arraySubrange.StartOffset);
glVertexArray.SetElementArrayBuffer(glBuffer);
}
else
{
glVertexArray.SetElementArrayBuffer(null);
}
dirty = false;
return(glVertexArray);
}