VertexBufferBinding.cs

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using System;
 
namespace Microsoft.Xna.Framework.Graphics;
 
public struct VertexBufferBinding
{
    internal VertexBuffer _vertexBuffer;
 
    internal int _vertexOffset;
 
    internal int _instanceFrequency;
 
    public int InstanceFrequency => _instanceFrequency;
 
    public int VertexOffset => _vertexOffset;
 
    public VertexBuffer VertexBuffer => _vertexBuffer;
 
    public VertexBufferBinding(VertexBuffer vertexBuffer, int vertexOffset, int instanceFrequency)
    {
        if (vertexBuffer == null)
        {
            throw new ArgumentNullException("vertexBuffer", FrameworkResources.NullNotAllowed);
        }
        if (vertexOffset >= 0 && (uint)vertexOffset < vertexBuffer._vertexCount)
        {
            if (instanceFrequency < 0)
            {
                throw new ArgumentOutOfRangeException("instanceFrequency");
            }
            _vertexBuffer = vertexBuffer;
            _vertexOffset = vertexOffset;
            _instanceFrequency = instanceFrequency;
            return;
        }
        throw new ArgumentOutOfRangeException("vertexOffset");
    }
 
    public VertexBufferBinding(VertexBuffer vertexBuffer, int vertexOffset)
    {
        if (vertexBuffer == null)
        {
            throw new ArgumentNullException("vertexBuffer", FrameworkResources.NullNotAllowed);
        }
        if (vertexOffset >= 0 && (uint)vertexOffset < vertexBuffer._vertexCount)
        {
            _vertexBuffer = vertexBuffer;
            _vertexOffset = vertexOffset;
            _instanceFrequency = 0;
            return;
        }
        throw new ArgumentOutOfRangeException("vertexOffset");
    }
 
    public VertexBufferBinding(VertexBuffer vertexBuffer)
    {
        if (vertexBuffer == null)
        {
            throw new ArgumentNullException("vertexBuffer", FrameworkResources.NullNotAllowed);
        }
        _vertexBuffer = vertexBuffer;
        _vertexOffset = 0;
        _instanceFrequency = 0;
    }
 
    public static implicit operator VertexBufferBinding(VertexBuffer vertexBuffer)
    {
        return new VertexBufferBinding(vertexBuffer);
    }
}