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#define ABS(x) ((x) < 0 ? -(x) : (x))
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#define FLOOR(x) ((int)(x) - ((x) < 0 && (x) != (int)(x)))
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#define CEIL(x) ((int)(x) + ((x) > 0 && (x) != (int)(x)))
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#define CLAMP(val, low, high) ((val>high)?high:((val<low)?low:val))
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#define LERP(t,x0,x1) ((x0) + (t)*((x1)-(x0)))
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#define PULSE(a,b,x) (STEP((a),(x)) - STEP((b),(x)))