Graphics 2D and Flip

Blitz3D Forums/Blitz3D Programming/Graphics 2D and Flip

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Something I don't understand. I use Setbuffer Backbuffer() and draw an image. When I flip each frame, I expect the image to flicker between the drawn image and the black screen if the front buffer, but it doesn't. If I then text to the backbuffer the text still appears when flipped. With only one draw operation to the backbuffer it seems to write to the frontbuffer too ??