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normalsmodifier.cpp
1 // © Copyright 2010 - 2016 BlackTopp Studios Inc.
2 /* This file is part of The Mezzanine Engine.
3 
4  The Mezzanine Engine is free software: you can redistribute it and/or modify
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15  along with The Mezzanine Engine. If not, see <http://www.gnu.org/licenses/>.
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17 /* The original authors have included a copy of the license specified above in the
18  'Docs' folder. See 'gpl.txt'
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40 /*
41  -----------------------------------------------------------------------------
42  This source file is part of ogre-procedural
43 
44  For the latest info, see http://code.google.com/p/ogre-procedural/
45 
46  Copyright (c) 2010-2013 Michael Broutin
47 
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49  of this software and associated documentation files (the "Software"), to deal
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58  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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63  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
64  THE SOFTWARE.
65  -----------------------------------------------------------------------------
66  */
67 #ifndef _graphicsproceduralnormalsmodifier_cpp
68 #define _graphicsproceduralnormalsmodifier_cpp
69 
70 #include "Graphics/Procedural/Texture/normalsmodifier.h"
71 
72 #include "MathTools/mathtools.h"
73 
74 namespace Mezzanine
75 {
76  namespace Graphics
77  {
78  namespace Procedural
79  {
81  Amplify(64)
82  { }
83 
85  { }
86 
87  ///////////////////////////////////////////////////////////////////////////////
88  // Utility
89 
91  {
92  Whole Width = static_cast<Whole>( Buffer.GetWidth() );
93  Whole Height = static_cast<Whole>( Buffer.GetHeight() );
94  Real fAmp = static_cast<Real>( this->Amplify ) * 4.0f / 255.0f;
95  TextureBuffer TempBuffer( Buffer );
96 
97  for( Whole Y = 0 ; Y < Height ; ++Y )
98  {
99  for( Whole X = 0 ; X < Width ; ++X )
100  {
101  Whole XPrev = (X < 1) ? 0 : (X - 1) % Width;
102  Whole XNext = (X + 1) % Width;
103  Whole YPrev = (Y < 1) ? 0 : (Y - 1) % Height;
104  Whole YNext = (Y + 1) % Height;
105 
106  //Y Sobel filter
107  Real fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YNext) );
108  Real dY = fPix * -1.0f;
109  fPix = static_cast<Real>( Buffer.GetRedByte(X,YNext) );
110  dY += fPix * -2.0f;
111  fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YNext) );
112  dY += fPix * -1.0f;
113  fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YPrev) );
114  dY += fPix * 1.0f;
115  fPix = static_cast<Real>( Buffer.GetRedByte(X,YPrev) );
116  dY += fPix * 2.0f;
117  fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YPrev) );
118  dY += fPix * 1.0f;
119 
120  //X Sobel filter
121  fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YPrev) );
122  Real dX = fPix * -1.0f;
123  fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,Y) );
124  dX += fPix * -2.0f;
125  fPix = static_cast<Real>( Buffer.GetRedByte(XPrev,YNext) );
126  dX += fPix * -1.0f;
127  fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YPrev) );
128  dX += fPix * 1.0f;
129  fPix = static_cast<Real>( Buffer.GetRedByte(XNext,Y) );
130  dX += fPix * 2.0f;
131  fPix = static_cast<Real>( Buffer.GetRedByte(XNext,YNext) );
132  dX += fPix * 1.0f;
133 
134  Real NormX = -dX * fAmp / 255.0f;
135  Real NormY = -dY * fAmp / 255.0f;
136  Real Norm = MathTools::Sqrt(NormX * NormX + NormY * NormY + 1.0f);
137  if( Norm > (Real)10e-6 ) {
138  Norm = 1.0f / Norm;
139  }else{
140  Norm = 0.0f;
141  }
142  NormX = (NormX * Norm) * 127.0f + 128.0f;
143  NormY = (NormY * Norm) * 127.0f + 128.0f;
144  Real NormZ = Norm * 127.0f + 128.0f;
145 
146  TempBuffer.SetPixelByte( X, Y,
147  static_cast<UInt8>( NormX ),
148  static_cast<UInt8>( NormY ),
149  static_cast<UInt8>( NormZ ),
150  Buffer.GetAlphaByte(X,Y) );
151  }
152  }
153 
154  Buffer.SetData(TempBuffer);
155  }
156 
158  { return "NormalsModifier"; }
159 
160  ///////////////////////////////////////////////////////////////////////////////
161  // Configuration
162 
164  { this->Amplify = Amp; return *this; }
165  }//Procedural
166  }//Graphics
167 }//Mezzanine
168 
169 #endif
void SetPixelByte(const Whole X, const Whole Y, const ColourChannelType Red, const ColourChannelType Green, const ColourChannelType Blue, const ColourChannelType Alpha=255)
Set colour of a specified pixel using a 0-255 range. the X or Y location go beyond the set size of th...
Whole GetWidth() const
Get the pixel width of this texture.
A modifier that will convery a greyscale image into a normals map.
uint8_t UInt8
An 8-bit unsigned integer.
Definition: datatypes.h:118
ColourChannelType GetAlphaByte(const Whole X, const Whole Y) const
Gets the alpha colour value of a specified pixel. the X or Y location go beyond the set size of this ...
float Real
A Datatype used to represent a real floating point number.
Definition: datatypes.h:141
virtual String GetName() const
Gets the name of this modifier.
A convenience buffer that stores pixel colour values of a texture to be generated.
Definition: texturebuffer.h:86
The bulk of the engine components go in this namspace.
Definition: actor.cpp:56
unsigned long Whole
Whole is an unsigned integer, it will be at least 32bits in size.
Definition: datatypes.h:151
Whole GetHeight() const
Get the pixel height of this texture.
virtual void Modify(TextureBuffer &Buffer)
Alters the generated pixels in a TextureBuffer.
NormalsModifier & SetAmplify(const UInt8 Amp)
Unknown.
std::string String
A datatype used to a series of characters.
Definition: datatypes.h:159
void SetData(const TextureBuffer &Other)
Copies image data from another buffer into this buffer.
ColourChannelType GetRedByte(const Whole X, const Whole Y) const
Gets the red colour value of a specified pixel. the X or Y location go beyond the set size of this te...