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how to transparent surface?

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When you call D3DXCreateTextureFromFileEx the 11th parameter is for a color to use as a colorkey. Set that to which ever colour you want transparent, and then set these renderstates just before you draw using the texture:


lpDevice->SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_SELECTARG1);
lpDevice->SetTextureStageState(0,D3DTSS_COLORARG1,D3DTA_TEXTURE);

lpDevice->SetTextureStageState(0,D3DTSS_ALPHAOP,D3DTOP_SELECTARG1);
lpDevice->SetTextureStageState(0,D3DTSS_ALPHAARG1,D3DTA_TEXTURE);

lpDevice->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);
lpDevice->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);
lpDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,TRUE);



Alternativly, you could generate a real alpha channel for the texture at runtime, check out this article.

Alan

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