/// <summary>
/// Function to retrieve a copy of this buffer as a staging resource.
/// </summary>
/// <returns>The staging buffer to retrieve.</returns>
public GorgonIndexBuffer GetStaging()
{
var buffer = new GorgonIndexBuffer(Graphics,
new GorgonIndexBufferInfo(_info, $"{Name}_Staging")
{
Binding = VertexIndexBufferBinding.None,
Usage = ResourceUsage.Staging
});
CopyTo(buffer);
return(buffer);
}
/// <summary>
/// Function to assign an index buffer to the draw call.
/// </summary>
/// <param name="buffer">The buffer to assign.</param>
/// <param name="indexStart">[Optional] The first index in the index buffer to render.</param>
/// <param name="indexCountPerInstance">[Optional] The number of indices to render, per instance.</param>
/// <returns>The fluent builder interface.</returns>
/// <exception cref="ArgumentOutOfRangeException">Thrown when the <paramref name="indexStart"/> parameter is less than 0.
/// <para>-or-</para>
/// <para>Thrown when the <paramref name="indexCountPerInstance"/> parameter is less than 1.</para>
/// </exception>
public GorgonInstancedIndexCallBuilder IndexBuffer(GorgonIndexBuffer buffer, int indexStart = 0, int?indexCountPerInstance = null)
{
if (indexStart < 0)
{
throw new ArgumentOutOfRangeException(nameof(indexStart), Resources.GORGFX_ERR_INDEX_TOO_SMALL);
}
if ((indexCountPerInstance != null) && (indexCountPerInstance < 1))
{
throw new ArgumentOutOfRangeException(nameof(indexCountPerInstance), Resources.GORGFX_ERR_INDEX_COUNT_TOO_SMALL);
}
DrawCall.IndexStart = indexStart;
DrawCall.IndexCountPerInstance = indexCountPerInstance ?? 0;
DrawCall.IndexBuffer = buffer;
return(this);
}