Gimme that video-memory address!

BlitzMax Forums/BlitzMax OpenGL Programming/Gimme that video-memory address!

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Does anyone know if there is a way to find out the memory address in video ram at which the backbuffer is currently located? Even if it might change with each Flip, if I could find out the memory location then maybe I could directly render pixels to it rather than have the GFX card have to go via the OpenGL driver?