1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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2 | * |
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3 | * This library is open source and may be redistributed and/or modified under |
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4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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5 | * (at your option) any later version. The full license is in LICENSE file |
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6 | * included with this distribution, and on the openscenegraph.org website. |
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7 | * |
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8 | * This library is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * OpenSceneGraph Public License for more details. |
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12 | */ |
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13 | |
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14 | #ifndef OSG_TEXMAT |
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15 | #define OSG_TEXMAT 1 |
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16 | |
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17 | #include <osg/StateAttribute> |
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18 | #include <osg/Matrix> |
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19 | |
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20 | namespace osg { |
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21 | |
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22 | /** A texture matrix state class that encapsulates OpenGL texture matrix |
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23 | * functionality. */ |
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24 | class OSG_EXPORT TexMat : public StateAttribute |
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25 | { |
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26 | public : |
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27 | |
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28 | TexMat(); |
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29 | |
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30 | TexMat(const Matrix& matrix):_matrix(matrix),_scaleByTextureRectangleSize(false) {} |
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31 | |
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32 | /** Copy constructor using CopyOp to manage deep vs shallow copy. */ |
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33 | TexMat(const TexMat& texmat,const CopyOp& copyop=CopyOp::SHALLOW_COPY): |
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34 | StateAttribute(texmat,copyop), |
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35 | _matrix(texmat._matrix), |
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36 | _scaleByTextureRectangleSize(texmat._scaleByTextureRectangleSize) {} |
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37 | |
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38 | META_StateAttribute(osg, TexMat, TEXMAT); |
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39 | |
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40 | virtual bool isTextureAttribute() const { return true; } |
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41 | |
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42 | /** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */ |
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43 | virtual int compare(const StateAttribute& sa) const |
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44 | { |
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45 | // Check for equal types, then create the rhs variable |
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46 | // used by the COMPARE_StateAttribute_Parameter macros below. |
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47 | COMPARE_StateAttribute_Types(TexMat,sa) |
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48 | |
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49 | // Compare each parameter in turn against the rhs. |
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50 | COMPARE_StateAttribute_Parameter(_matrix) |
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51 | |
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52 | return 0; // Passed all the above comparison macros, so must be equal. |
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53 | } |
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54 | |
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55 | /** Set the texture matrix */ |
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56 | inline void setMatrix(const Matrix& matrix) { _matrix = matrix; } |
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57 | |
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58 | /** Get the texture matrix */ |
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59 | inline Matrix& getMatrix() { return _matrix; } |
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60 | |
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61 | /** Get the const texture matrix */ |
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62 | inline const Matrix& getMatrix() const { return _matrix; } |
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63 | |
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64 | /** Switch on/off the post scaling of the TexMat matrix by the size of the last applied texture rectangle. |
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65 | * Use a TexMat alongside a TextureRectangle with this scaling applied allows one to treat a TextureRectnagles texture coordinate |
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66 | * range as if it were the usual non dimensional 0.0 to 1.0 range. |
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67 | * Note, the TexMat matrix itself is not modified by the post scaling, its purely an operation passed to OpenGL to do the post scaling once the |
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68 | * the TexMat matrix has been loaded.*/ |
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69 | void setScaleByTextureRectangleSize(bool flag) { _scaleByTextureRectangleSize = flag; } |
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70 | |
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71 | /** Get whether the post scaling of the TexMat matrix, by the size of the last applied texture rectangle, is switched on/off.*/ |
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72 | bool getScaleByTextureRectangleSize() const { return _scaleByTextureRectangleSize; } |
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73 | |
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74 | /** Apply texture matrix to OpenGL state. */ |
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75 | virtual void apply(State& state) const; |
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76 | |
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77 | protected: |
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78 | |
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79 | virtual ~TexMat( void ); |
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80 | |
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81 | Matrix _matrix; |
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82 | bool _scaleByTextureRectangleSize; |
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83 | |
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84 | }; |
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85 | |
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86 | } |
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87 | |
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88 | |
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89 | #endif |
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