Developer Documentation

- Main Page
- Related Pages
- Modules
- Namespaces
- Classes
- Files

- File List
- File Members

All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Properties Friends Macros Modules Pages
TextureMath.cc
1 /*===========================================================================*\
2 * *
3 * OpenFlipper *
4 * Copyright (c) 2001-2015, RWTH-Aachen University *
5 * Department of Computer Graphics and Multimedia *
6 * All rights reserved. *
7 * www.openflipper.org *
8 * *
9 *---------------------------------------------------------------------------*
10 * This file is part of OpenFlipper. *
11 *---------------------------------------------------------------------------*
12 * *
13 * Redistribution and use in source and binary forms, with or without *
14 * modification, are permitted provided that the following conditions *
15 * are met: *
16 * *
17 * 1. Redistributions of source code must retain the above copyright notice, *
18 * this list of conditions and the following disclaimer. *
19 * *
20 * 2. Redistributions in binary form must reproduce the above copyright *
21 * notice, this list of conditions and the following disclaimer in the *
22 * documentation and/or other materials provided with the distribution. *
23 * *
24 * 3. Neither the name of the copyright holder nor the names of its *
25 * contributors may be used to endorse or promote products derived from *
26 * this software without specific prior written permission. *
27 * *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
31 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
32 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
33 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
34 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
35 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
36 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
37 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
38 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
39 * *
40 \*===========================================================================*/
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $LastChangedBy$ *
46 * $Date$ *
47 * *
48 \*===========================================================================*/
49
50 #include "TextureMath.hh"
51
52 #include <cmath>
53
54 TextureMath::TextureMath(const bool _abs,
55 const bool _clamp,
56 const double _clampMin,
57 const double _clampMax,
58 const bool _repeat,
59 const double _minRepeat,
60 const double _maxRepeat,
61 const bool _center,
62 const bool _scale,
63 const double _minimalInput,
64 const double _maximalInput):
65 abs_(_abs),
66 clamp_(_clamp),
67 clampMin_(_clampMin),
68 clampMax_(_clampMax),
69 repeat_(_repeat),
70 repeatMin_(_minRepeat),
71 repeatMax_(_maxRepeat),
72 center_(_center),
73 scale_(_scale),
74 minInput_(_minimalInput),
75 maxInput_(_maximalInput)
76 {
77
78 }
79
80 TextureMath::TextureMath(const TexParameters& _parameters, const double _minimalInput, const double _maximalInput) :
81 abs_(_parameters.abs),
82 clamp_(_parameters.clamp),
83 clampMin_(_parameters.clampMin),
84 clampMax_(_parameters.clampMax),
85 repeat_(_parameters.repeat),
86 repeatMin_(_parameters.repeatMin),
87 repeatMax_(_parameters.repeatMax),
88 center_(_parameters.center),
89 scale_(_parameters.scale),
90 minInput_(_minimalInput),
91 maxInput_(_maximalInput)
92 {
93 }
94
95 double TextureMath::transform(const double _input) const
96 {
97 double value = _input;
98
99
100 // Use absolute value as requested by plugin
101 if ( abs_ )
102 value = fabs(value);
103
104 // Clamp if requested
105 if ( clamp_ ) {
106 if ( value > clampMax_ )
107 value = clampMax_;
108 if (value < clampMin_)
109 value = clampMin_;
110 }
111
112 // if all texCoords have the same value
113 if ( minInput_ == maxInput_){
114
115 if ( ! repeat_ )
116 value = 0.0;
117 else
118 value = maxInput_;
119
120 return value;
121 }
122
123
124 // if the texture should not be repeated, scale to 0..1
125 if ( ! repeat_ ) {
126 if (! center_ ) {
127 if ( scale_) {
128 value /= fabs(maxInput_) + fabs(minInput_); //scaleFactor is != 0.0 (otherwise _min==_max)
129 value -= minInput_/(fabs(maxInput_) + fabs(minInput_));
130 }
131 } else {
132 // the values above zero are mapped to 0.5..1 the negative ones to 0.5..0
133 if (value > 0.0) {
134 value /= ( maxInput_ * 2.0); //_max >= _value > 0.0
135 value += 0.5;
136 } else {
137 if ( minInput_ == 0.0 ){
138 value = 0.0;
139 } else {
140 value /= ( minInput_ * 2.0);
141 value = 0.5 - value;
142 }
143 }
144 }
145 } else {
146 value -= minInput_;
147 value *= (repeatMax_ - repeatMin_) / (maxInput_ - minInput_);
148 value += repeatMin_;
149 }
150
151 return value;
152 }
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:54
TexParameters
Definition: TextureParameters.hh:53
TextureMath::transform
double transform(const double _input) const
Modify given values based on the specified parameters given to the constructor.
Definition: TextureMath.cc:95