ModelMeshPart.cs

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namespace Microsoft.Xna.Framework.Graphics;
 
public sealed class ModelMeshPart
{
    internal VertexBuffer vertexBuffer;
 
    internal IndexBuffer indexBuffer;
 
    private int startIndex;
 
    private int primitiveCount;
 
    private int vertexOffset;
 
    private int numVertices;
 
    private Effect effect;
 
    private object tag;
 
    internal ModelMesh parent;
 
    public int StartIndex => startIndex;
 
    public int PrimitiveCount => primitiveCount;
 
    public int VertexOffset => vertexOffset;
 
    public int NumVertices => numVertices;
 
    public IndexBuffer IndexBuffer => indexBuffer;
 
    public VertexBuffer VertexBuffer => vertexBuffer;
 
    public Effect Effect
    {
        get
        {
            return effect;
        }
        set
        {
            if (value == effect)
            {
                return;
            }
            bool flag = false;
            bool flag2 = false;
            int count = parent.MeshParts.Count;
            for (int i = 0; i < count; i++)
            {
                ModelMeshPart modelMeshPart = parent.MeshParts[i];
                if (!object.ReferenceEquals(modelMeshPart, this))
                {
                    Effect objA = modelMeshPart.Effect;
                    if (object.ReferenceEquals(objA, effect))
                    {
                        flag = true;
                    }
                    else if (object.ReferenceEquals(objA, value))
                    {
                        flag2 = true;
                    }
                }
            }
            if (!flag && effect != null)
            {
                parent.Effects.Remove(effect);
            }
            if (!flag2 && value != null)
            {
                parent.Effects.Add(value);
            }
            effect = value;
        }
    }
 
    public object Tag
    {
        get
        {
            return tag;
        }
        set
        {
            tag = value;
        }
    }
 
    internal ModelMeshPart(int vertexOffset, int numVertices, int startIndex, int primitiveCount, object tag)
    {
        this.vertexOffset = vertexOffset;
        this.numVertices = numVertices;
        this.startIndex = startIndex;
        this.primitiveCount = primitiveCount;
        this.tag = tag;
    }
 
    internal void Draw()
    {
        if (NumVertices > 0)
        {
            GraphicsDevice graphicsDevice = vertexBuffer.GraphicsDevice;
            graphicsDevice.SetVertexBuffer(vertexBuffer, vertexOffset);
            graphicsDevice.Indices = indexBuffer;
            graphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, numVertices, startIndex, primitiveCount);
        }
    }
}