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Remove support for fixed-function pipeline #3505
However, with the deprecation of FFP already being several years old, and GLSL programming becoming more widespread, there is little reason to keep FFP around. The GL renderer does not use it at all, since we run our own shaders to handle all rendering operations, including lighting and texturing. We do incur in some redundancy by not removing it, since GL2ES1 still handles the FFP uniforms (transformation matrices, lighting parameters), but Processing does not use them.