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#ifndef PMAPRAND_H
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#define PMAPRAND_H
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/*
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==================================================================
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Random number generators for photon distribution
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Fraunhofer Institute for Solar Energy Systems,
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Lucerne University of Applied Sciences & Arts
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==================================================================
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$Id: pmaprand.h,v 4.1 2014/01/24 14:54:13 taschreg Exp taschreg $
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*/
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/* According to the analytical validation, skipping numbers in the sequence
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introduces bias in scenes with high reflectance. We therefore use
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erand48() with separate states for photon emission, scattering, and
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russian roulette. The pmapSeed() and pmapRandom() macros can be adapted
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to other (better?) RNGs. */
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#define pmapSeed(seed, state) (state [0] += seed, state [1] += seed, \
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state [2] += seed)
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#define pmapRandom(state) erand48(state)
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extern unsigned short partState [3], emitState [3], cntState [3],
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mediumState [3], scatterState [3], rouletteState [3],
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randSeed;
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#endif
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