69 lines
1.7 KiB
Text
69 lines
1.7 KiB
Text
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file linearNoiseForce.I
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* @author charles
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* @date 2000-06-19
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*/
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/**
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* Returns a valid entry in the prn table
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*/
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INLINE unsigned char LinearNoiseForce::
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prn_lookup(int index) const {
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return _prn_table[index & 255];
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}
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/**
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* Hashes a point, returns a prn
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*/
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INLINE unsigned char LinearNoiseForce::
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get_prn_entry(const LPoint3& point) const {
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return prn_lookup((int)(point[0] + prn_lookup((int)(point[1] + prn_lookup((int)point[2])))));
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}
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/**
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* Hashes a point, returns a prn (piecewise)
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*/
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INLINE unsigned char LinearNoiseForce::
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get_prn_entry(const PN_stdfloat x, const PN_stdfloat y, const PN_stdfloat z) const {
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return prn_lookup((int)(x + prn_lookup((int)(y + prn_lookup((int)z)))));
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}
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/**
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* Hashes a point, returns a gradient vector
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*/
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INLINE LVector3& LinearNoiseForce::
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get_lattice_entry(const LPoint3& point) {
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return _gradient_table[get_prn_entry(point)];
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}
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/**
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* Hashes a point, returns a gradient vector (piecewise)
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*/
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INLINE LVector3& LinearNoiseForce::
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get_lattice_entry(const PN_stdfloat x, const PN_stdfloat y, const PN_stdfloat z) {
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return _gradient_table[get_prn_entry(x, y, z)];
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}
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/**
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* Smooths a parameterized interpolation using 2x^3 - 3x^2
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*/
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INLINE PN_stdfloat LinearNoiseForce::
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cubic_step(const PN_stdfloat x) const {
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return x * x * ((2 * x) - 3);
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}
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/**
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* Vector linear interpolation
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*/
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INLINE LVector3 LinearNoiseForce::
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vlerp(const PN_stdfloat t, const LVector3& v0, const LVector3& v1) const {
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return v0 + ((v1 - v0) * t);
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}
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