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Kiamo

OpenGL Fastest way for dynamic 2D?

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I want to do dynamic 2D drawing in OpenGL without using frag programs. I was wondering how some people do such seemingly intensive 2D work in OpenGL very fast (e.g. Winamp's Milkdrop plug-in, or things like this Plasma Pong game [ http://www.gamedev.net/community/forums/topic.asp?topic_id=378340 ]). How is such dynamic 2D art rendered so fast?

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Most visulisers like Milkdrop render at low resolutions (typically 320x240), then upload this into a texture. When the texture is finally drawn on the screen the texture filtering hides a lot of the low-res look. Although most visulisers aren't actually doing a lot of work - they mainly rely on feedback (using the previous frame drawn over the current frame in a slightly distorted manner) which produces nice results but is also the reason why most visulisers tend to look very similar.

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