Speed up shaders (both compilation and execution) by explicitly enabling only the needed effects.
Change the the render() API!
THis introduces some regressions with the Effects3D app.
Major: change of API.
Split DFramebuffer into Framebuffer and Screen; introduce the 'DistortedInputSurface' and 'DistortedOutputSurface' interfaces.
Some fixes for issues discovered by the Multiblur app.
Beginnings of the 'Multiblur' app.