What is the most efficient way to draw curves in opengles? Thanks.

Typically you’d tesselate them into lines/triangles until they’re rounded enough for your purposes. You need to be more specific if you want a more specific answer.

I’m thinknig of an animation similar to the “Beziers” screensaver on winXP. I dont think tesellation would work there. Is there any way, any transformation, that would draw a line as a curve?

No, rasterization is always linear.

Why do you think tessellation would not work? Many curve drawing libraries work by tessellating a curve into sufficiently small line segments.

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