/// <summary>
/// Function to create a index buffer.
/// </summary>
/// <param name="name">The name of the buffer.</param>
/// <param name="settings">The settings for the buffer.</param>
/// <param name="initialData">[Optional] Initial data to populate the index buffer with.</param>
/// <returns>A new index buffer.</returns>
/// <remarks>This method should only be called from an immediate graphics context, if it is called from a deferred context an exception will be thrown.</remarks>
/// <exception cref="System.ArgumentNullException">Thrown when the <paramref name="name"/> parameter is NULL (Nothing in VB.Net).
/// <para>-or-</para>
/// <para>Thrown when the <paramref name="settings"/> parameter is NULL.</para>
/// </exception>
/// <exception cref="System.ArgumentException">Thrown when the <paramref name="name"/> parameter is empty.</exception>
/// <exception cref="GorgonLibrary.GorgonException">Thrown when the <see cref="GorgonLibrary.Graphics.GorgonIndexBufferSettings.IsOutput">IsOutput</see> property is TRUE and has a usage that is not Default.
/// <para>-or-</para>
/// <para>Thrown when the <see cref="GorgonLibrary.Graphics.GorgonIndexBufferSettings.SizeInBytes">SizeInBytes</see> property of the <paramref name="settings"/> parameter is less than 1.</para>
/// <para>-or-</para>
/// <para>Thrown when the usage is set to immutable and the <paramref name="initialData"/> parameter is NULL (Nothing in VB.Net) or has no data.</para>
/// </exception>
public GorgonIndexBuffer CreateIndexBuffer(string name, GorgonIndexBufferSettings settings, GorgonDataStream initialData = null)
{
if (_graphics.IsDeferred)
{
throw new GorgonException(GorgonResult.CannotCreate, Resources.GORGFX_CANNOT_USE_DEFERRED_CONTEXT);
}
if (settings == null)
{
throw new ArgumentNullException("settings");
}
if (settings.SizeInBytes < 1)
{
throw new GorgonException(GorgonResult.CannotCreate, string.Format(Resources.GORGFX_BUFFER_SIZE_TOO_SMALL, 1));
}
if ((settings.Usage == BufferUsage.Immutable) && ((initialData == null) || (initialData.Length == 0)))
{
throw new GorgonException(GorgonResult.CannotCreate, Resources.GORGFX_BUFFER_IMMUTABLE_REQUIRES_DATA);
}
ValidateGenericBufferSettings(settings);
var buffer = new GorgonIndexBuffer(_graphics, name, settings);
buffer.Initialize(initialData);
_graphics.AddTrackedObject(buffer);
return(buffer);
}
/// <summary>
/// Function to set the current index buffer, with an offset inside the buffer.
/// </summary>
/// <param name="buffer">Buffer to set.</param>
/// <param name="offset">Offset into the buffer to use, in bytes.</param>
public void SetIndexBuffer(GorgonIndexBuffer buffer, int offset)
{
if (_indexBuffer == buffer)
{
return;
}
#if DEBUG
if ((buffer != null) && ((offset >= buffer.SizeInBytes) || (offset < 0)))
{
throw new ArgumentOutOfRangeException("offset", string.Format(Resources.GORGFX_VALUE_OUT_OF_RANGE, offset, buffer.SizeInBytes));
}
#endif
if (buffer != null)
{
_graphics.Context.InputAssembler.SetIndexBuffer((D3D.Buffer)buffer.D3DResource,
buffer.Settings.Use32BitIndices ? GI.Format.R32_UInt : GI.Format.R16_UInt, offset);
}
else
{
_graphics.Context.InputAssembler.SetIndexBuffer(null, GI.Format.Unknown, 0);
}
_indexBuffer = buffer;
}
/// <summary>
/// Initializes a new instance of the <see cref="GorgonBufferUnorderedAccessView"/> class.
/// </summary>
/// <param name="resource">The buffer to bind to the view.</param>
/// <param name="format">The format of the view.</param>
/// <param name="firstElement">The first element in the buffer.</param>
/// <param name="elementCount">The number of elements to view.</param>
/// <param name="isRaw">TRUE if the view should be a raw view, FALSE if not.</param>
internal GorgonBufferUnorderedAccessView(GorgonResource resource, BufferFormat format, int firstElement, int elementCount, bool isRaw)
: base(resource, format)
{
IsRaw = isRaw;
ElementStart = firstElement;
ElementCount = elementCount;
_buffer = resource as GorgonBuffer;
_indexBuffer = resource as GorgonIndexBuffer;
_vertexBuffer = resource as GorgonVertexBuffer;
}
/// <summary>
/// Function to reset the states for the input assembler.
/// </summary>
internal void Reset()
{
_graphics.Context.InputAssembler.SetIndexBuffer(null, GI.Format.Unknown, 0);
VertexBuffers.Reset();
_graphics.Context.InputAssembler.PrimitiveTopology = (PrimitiveTopology.TriangleList);
_graphics.Context.InputAssembler.InputLayout = null;
_indexBuffer = null;
_inputLayout = null;
_primitiveType = PrimitiveType.TriangleList;
}
/// <summary>
/// Initializes a new instance of the <see cref="GorgonBufferShaderView"/> class.
/// </summary>
/// <param name="buffer">The buffer to bind to the view.</param>
/// <param name="format">Format of the view.</param>
/// <param name="elementStart">The starting element for the view.</param>
/// <param name="elementCount">The number of elements in the view.</param>
/// <param name="isRaw">TRUE to use a raw view, FALSE to use a normal view.</param>
internal GorgonBufferShaderView(GorgonResource buffer, BufferFormat format, int elementStart, int elementCount, bool isRaw)
: base(buffer, format)
{
IsRaw = isRaw;
ElementStart = elementStart;
ElementCount = elementCount;
_buffer = buffer as GorgonBuffer;
_structuredBuffer = buffer as GorgonStructuredBuffer;
_indexBuffer = buffer as GorgonIndexBuffer;
_vertexBuffer = buffer as GorgonVertexBuffer;
}
