Thanks for all your help guys, I got it working by breaking the image up into chunks as you said 
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GLBasic - en / Beginner's Question - Scrolling large BMP
2010-Dec-19
Hi, I'm interested in writing a vertical scrolling shoot 'em up. My plan of action to learn GLBasic with this project was to get a background scrolling first and foremost, and thought of simply having a large (long) static image scrolling to make things easy - I've got some limited experience with BASIC, but not games programming so tile maps are scary to me! Besides, I'm no artist so didn't want to spend ages trying to draw tiles when I can knock-up a test background in 2 minutes if it's in one chunk.
I've tried to load a large bmp/png as a sprite (320 x 7680) and then scrolling that by changing the vertical every frame, but I don't seem to be able to get the entire image to display. Is there a limitation on the height of sprites? Is there another way of going about what I want to achieve that would be better? Thanks!
I've tried to load a large bmp/png as a sprite (320 x 7680) and then scrolling that by changing the vertical every frame, but I don't seem to be able to get the entire image to display. Is there a limitation on the height of sprites? Is there another way of going about what I want to achieve that would be better? Thanks!
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