通过

IndexBuffer.SetData Generic Method (T , Int32, Int32, SetDataOptions)

  • 项目

Copies array data to the index buffer.

Namespace: Microsoft.Xna.Framework.Graphics
Assembly: Microsoft.Xna.Framework (in microsoft.xna.framework.dll)

Syntax

public void SetData<T> (
         T[] data,
         int startIndex,
         int elementCount,
         SetDataOptions options
) where T : ValueType

Type Parameters

  • T
    The type of the elements in the array.

Parameters

  • data
    The array of data to copy.
  • startIndex
    The index of the element in the array at which to start copying.
  • elementCount
    The number of elements to copy.
  • options
    Option that specifies whether existing data in the buffer will be kept after this operation. Discard is not valid on Xbox 360, but dynamic geometry may be rendered on the Xbox 360 by using DrawUserIndexedPrimitives instead of setting the data for the index buffer.

Remarks

Warning

In the Draw method of an Xbox 360 game, vertex buffers, index buffers, and textures should not be written using when they are intended to be used for rendering. This condition may lead to graphics corruption or crashes. To avoid this potential issue, use DrawUserIndexedPrimitives as the preferred alternative to for dynamic vertex and index generation.

This is because, in cases where the size of the back buffer and depth stencil buffer exceed the size of the Xbox 360 10 MB of embedded memory (EDRAM), predicated tiling is utilized on this platform to compensate for the additional memory requirements. Predicated tiling is a process by which scene rendering is performed multiple times on subsections of the final render target dimensions.

When predicated tiling has been triggered, the drawing commands contained in the Draw function are not submitted until Present is called. (Note that Draw implicitly calls Present at the end of this method.) In this case, these resources are not available for modification until the GPU is finished with presenting the entire frame.

See Also

Concepts

Predicated Tiling

Reference

IndexBuffer Class
IndexBuffer Members
Microsoft.Xna.Framework.Graphics Namespace

Platforms

Xbox 360, Windows XP SP2, Windows Vista