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The eldest brother encountered a problem, there is a pile of floating-point arithmetic, separate write on the right, unity from the overflow.

Because the defined function returns float, the other place declares that void is wrong, so that error accumulates eight times and the floating-point register is full. There is no place to put the wrong.

Add two jagged

Http://en.wikipedia.org/wiki/Temporal_anti-aliasing

Http://blogs.msdn.com/b/shawnhar/archive/2011/10/31/shader-aliasing.aspx

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