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Change the the render() API!
THis introduces some regressions with the Effects3D app.
Preparation for change of the render API.
Minor
Major: change of API.
Split DFramebuffer into Framebuffer and Screen; introduce the 'DistortedInputSurface' and 'DistortedOutputSurface' interfaces.
Introduce Renderable to the Tree.
Some fixes for issues discovered by the Multiblur app.
Beginnings of the 'Multiblur' app.
Separable Gaussian Blur with linear sampling done.
Linear sampling implemented - i.e. blurring by a (2N+1)x(2N+1) gaussian kernel (centeral pixel + N pixels in each direction) requires exactly 2N + (N%2==1 ? 4:2) texture fetches.
Separable Box blur (almost) works.
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