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problem with GetConstantByName

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hello, i would like my pixel shader to use 2 sampler2D, but i cannot manage to add the second one... I do : handle = m_pPixelConstants->GetConstantByName(NULL,"decal")) that works and i get the index of the texture and call g_pd3dDevice->SetTexture( TextureIndex, g_pTexture ); and then i call : handle = m_pPixelConstants->GetConstantByName(NULL,"bump")) but that time, handle is NULL after this call, so I can't set this texture... any idea ? is there something to indicate to specify using multiple texture in the pixel shader ? (i compile with ps_2_0)

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