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Your task

In engine source code, every symbol used to enable/disable portions of code has a positive value: if that symbol is defined, then such feature is activated. They only exception is S3D_DISABLED, that when defined disables stereo rendering. Your task is to convert any reference of that symbol to the common format USE_S3D_RENDERING.

Deliverable

A working patch, that applies cleanly to our source tree. This patch should be in the form of a pull from clone, hg export or unified diff format (in order of preference) implementing the functionality required.