Seems like a very simple expansion on this technique would be to keep a rolling framebuffer, and blend the last particle draw with the current one. This would r

Seems like a very simple expansion on this technique would be to keep a rolling framebuffer, and blend the last particle draw with the current one. This would remove the flickering, display the fake alpha properly for still screenshots, and work for variable framerate. Assuming your GPU will let you hold onto a previous frame's draw result (of just the particles) and blend it relatively cheaply with the new one, it wouldn't cost very much to implement. One full framebuffer blend should be much, much cheaper than blending the individual dots.