Developer Documentation

TextureMath.cc
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40 \*===========================================================================*/
41
42
43
44 #include "TextureMath.hh"
45
46 #include <cmath>
47
48 TextureMath::TextureMath(const bool _abs,
49 const bool _clamp,
50 const double _clampMin,
51 const double _clampMax,
52 const bool _repeat,
53 const double _minRepeat,
54 const double _maxRepeat,
55 const bool _center,
56 const bool _scale,
57 const double _minimalInput,
58 const double _maximalInput):
59 abs_(_abs),
60 clamp_(_clamp),
61 clampMin_(_clampMin),
62 clampMax_(_clampMax),
63 repeat_(_repeat),
64 repeatMin_(_minRepeat),
65 repeatMax_(_maxRepeat),
66 center_(_center),
67 scale_(_scale),
68 minInput_(_minimalInput),
69 maxInput_(_maximalInput)
70 {
71
72 }
73
74 TextureMath::TextureMath(const TexParameters& _parameters, const double _minimalInput, const double _maximalInput) :
75 abs_(_parameters.abs),
76 clamp_(_parameters.clamp),
77 clampMin_(_parameters.clampMin),
78 clampMax_(_parameters.clampMax),
79 repeat_(_parameters.repeat),
80 repeatMin_(_parameters.repeatMin),
81 repeatMax_(_parameters.repeatMax),
82 center_(_parameters.center),
83 scale_(_parameters.scale),
84 minInput_(_minimalInput),
85 maxInput_(_maximalInput)
86 {
87 }
88
89 double TextureMath::transform(const double _input) const
90 {
91 double value = _input;
92
93
94 // Use absolute value as requested by plugin
95 if ( abs_ )
96 value = fabs(value);
97
98 // Clamp if requested
99 if ( clamp_ ) {
100 if ( value > clampMax_ )
101 value = clampMax_;
102 if (value < clampMin_)
103 value = clampMin_;
104 }
105
106 // if all texCoords have the same value
107 if ( minInput_ == maxInput_){
108
109 if ( ! repeat_ )
110 value = 0.0;
111 else
112 value = maxInput_;
113
114 return value;
115 }
116
117
118 // if the texture should not be repeated, scale to 0..1
119 if ( ! repeat_ ) {
120 if (! center_ ) {
121 if ( scale_) {
122 value /= fabs(maxInput_) + fabs(minInput_); //scaleFactor is != 0.0 (otherwise _min==_max)
123 value -= minInput_/(fabs(maxInput_) + fabs(minInput_));
124 }
125 } else {
126 // the values above zero are mapped to 0.5..1 the negative ones to 0.5..0
127 if (value > 0.0) {
128 value /= ( maxInput_ * 2.0); //_max >= _value > 0.0
129 value += 0.5;
130 } else {
131 if ( minInput_ == 0.0 ){
132 value = 0.0;
133 } else {
134 value /= ( minInput_ * 2.0);
135 value = 0.5 - value;
136 }
137 }
138 }
139 } else {
140 value -= minInput_;
141 value *= (repeatMax_ - repeatMin_) / (maxInput_ - minInput_);
142 value += repeatMin_;
143 }
144
145 return value;
146 }
TexParameters
Definition: TextureParameters.hh:47
TextureMath::transform
double transform(const double _input) const
Modify given values based on the specified parameters given to the constructor.
Definition: TextureMath.cc:89
TextureMath::TextureMath
TextureMath(const bool _abs, const bool _clamp, const double _clampMin, const double _clampMax, const bool _repeat, const double _minRepeat, const double _maxRepeat, const bool _center, const bool _scale, const double _minimalInput, const double _maximalInput)
Definition: TextureMath.cc:48