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Alpha Bypassing

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I want to write to the AlphaChannel(Deep,...) and use Opcity(8 Bit SrcAlpha + InvScrAlpha) in a single pass. Has anyone done ist ?? I have done this before, but in a bad hack. I am rendering the scene into a texture. Setting the texture i am rendering in stage 0 and the base texture in Stage 1. Then im am "lrp" tex0.rgb and tex1.rgb by tex1.a. Then setting alpha to the value i want. It works but is not nice to read a texture witch is the aktuell rendertarget. And don´t try to EMBM the input tex0, maybe it works(ATI) but most times you see the titels, or artifacts. Has anyone a better idea for this ???

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First change the alpha channel of the material being used by
the mesh. Then make the following:

p_D3Ddevice->SetRenderState( D3DRS_ALPHABLENDENABLE, true );
p_D3Ddevice->SetRenderState( D3DRS_SRCBLEND, D3DBLEND_SRCALPHA );

pMeshMaterials[0].Diffuse.a = 0.5f; //Set the opacity of the mesh

p_D3Ddevice->SetMaterial( &pMeshMaterials[0] ); //Set the material being used to render the mesh

p_D3Ddevice->SetTexture( 0, pMeshTextures[0] ); //Set the texture being used to render the mesh

pMesh->DrawSubset(0); // Render the mesh;


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I ment I want to use the alpha channel for ohter thing than Opcity
By using
"p_D3Ddevice->SetRenderState( D3DRS_ALPHABLENDENABLE, true );"
I have Opctiy Alpha in the Rendertarget, but I want deep in alpha channel in a singel pass.

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