Alpha blending problem

[bergerkiller]

Hello all.

Finishing off the very first 3D dual video channel model viewer, but I got into a problem. I have already managed to draw the two renders into textures, they are named dLTexture and dRTexture. Both textures are rendered correctly.

I know how to draw these two textures in cross-eye mode by using sprites (SContainer), but now I have to draw them as anaglyph. This means, both textures with half opacity and left channel no green and right channel no red color. I have to blend these two together, so here is the code:

            Device.RenderState.SourceBlend = Direct3D.Blend.DestinationAlpha
            Device.RenderState.DestinationBlend = Direct3D.Blend.SourceAlpha
            Device.RenderState.AlphaBlendEnable = True
            Device.Clear(ClearFlags.Target Or ClearFlags.ZBuffer, Color.Transparent, 1, 0)
            Device.BeginScene()
            SContainer.Begin(SpriteFlags.None)
            If KeyPressed(Windows.Forms.Keys.Q) Then
                SContainer.Draw2D(dRTexture, New Point(0, 0), 0, New Point(0, 0), Color.FromArgb(128, 0, 255, 128))
                SContainer.Draw2D(dLTexture, New Point(0, 0), 0, New Point(0, 0), Color.FromArgb(128, 255, 0, 128))
            Else
                SContainer.Draw2D(dLTexture, New Point(0, 0), 0, New Point(0, 0), Color.FromArgb(128, 255, 0, 128))
                SContainer.Draw2D(dRTexture, New Point(0, 0), 0, New Point(0, 0), Color.FromArgb(128, 0, 255, 128))
            End If
            SContainer.End()
            Device.EndScene()
            Device.Present()

But, when I press Q the screen changes, and this should NOT happen. The two textures must be blended so that they add color, so twisting the texture draw order should not make a difference. What am I doing wrong here?

BTW: when I use "Device.RenderState.DestinationBlend = Direct3D.Blend.SourceColor" it multiplies the colors, clearing the red and green channel. I don't want this. It must "add" the color values of both textures.