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xujiezhige

CloneMesh()

5 posts in this topic

I load a mesh from Xfile using CDXUTXfileMesh::Create. Then i clone the mesh using CloneMesh( D3DXMESH_WRITEONLY ).

Which memory pool does the new mesh resides, POOL_MANAGED or POOL_DEFAULT?[img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img]
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You can specify the memory pool in the first parameter, you can write for example:
CloneMesh(D3DXMESH_MANAGED | D3DXMESH_WRITEONLY, blablabla....)
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D3DXMESH_MANAGED means D3DPOOL_MANAGED for vertex and index buffer of the mesh. Like this one, D3DXMESH_WRITEONLY means D3DUSAGE_WRITEONLY for both vertex and index bufferof the mesh.

So, you can check DX docs for D3DUSAGE and D3DPOOL. Docs say about D3DUSAGE_WRITEONLY: [i]"Buffers created with D3DPOOL_DEFAULT that do not specify D3DUSAGE_WRITEONLY might suffer a severe performance penalty."[/i]
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Thank you, TomKQT and programci_84.

I know how to specify memory pool. But don't know if not specify memory pool, just giving only D3DUSAGE_WRITEONLY, which memory pool it resides.

I had found the sentence---[i]"Buffers created with D3DPOOL_DEFAULT that do not specify D3DUSAGE_WRITEONLY might suffer a severe performance penalty.".[/i]
But I don't understand it well, does it mean if specify D3DUSAGE_WRITEONLY, the memory pool is D3DPOOL_DEFAULT?

maybe that's it meaning.[img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]
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[quote name='Jeason' timestamp='1330329531' post='4916917']
I know how to specify memory pool. But don't know if not specify memory pool, just giving only D3DUSAGE_WRITEONLY, which memory pool it resides.
[/quote]
You've 2 memory pool parameters for D3DX Mesh functions: D3DXMESH_MANAGED and D3DXMESH_SYSTEMMEM. If you don't specify one of'em, the function will choose D3DPOOL_DEFAULT for both vertex and index buffer of the mesh. So, if you specify only D3DXMESH_WRITEONLY, buffers will reside default memory pool.

[quote name='Jeason' timestamp='1330329531' post='4916917']
I had found the sentence---[i]"Buffers created with D3DPOOL_DEFAULT that do not specify D3DUSAGE_WRITEONLY might suffer a severe performance penalty.".[/i]
But I don't understand it well, does it mean if specify D3DUSAGE_WRITEONLY, the memory pool is D3DPOOL_DEFAULT?

maybe that's it meaning.[img]http://public.gamedev.net//public/style_emoticons/default/smile.png[/img]
[/quote]
As far as I understand, the sentence says: "Unless you specify D3DUSAGE_WRITEONLY, D3DPOOL_DEFAULT is a bad choice for memory pool. i.e. D3DPOOL_DEFAULT works well with only D3DUSAGE_WRITEONLY".

hth.
-R
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Thank you, programci_84!

You have given a good lesson to me.[img]http://public.gamedev.net//public/style_emoticons/default/biggrin.png[/img]
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