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32
33 /*!
34 \class SoTextureCoordinateCache SoTextureCoordinateCache.h Inventor/caches/SoTextureCoordinateCache.h
35 The SoTextureCoordinateClass is used to cache generated texture coordinates.
36 */
37
38 #include <Inventor/caches/SoTextureCoordinateCache.h>
39 #include <Inventor/lists/SbList.h>
40 #include <Inventor/SbBox3f.h>
41 #include <Inventor/SbVec2f.h>
42
43 #ifndef DOXYGEN_SKIP_THIS
44
45 class SoTextureCoordinateCacheP {
46 public:
47 SbList <SbVec2f> texCoords;
48 };
49
50 #endif // DOXYGEN_SKIP_THIS
51
52 #define PRIVATE(obj) ((obj)->pimpl)
53
54 /*!
55 Constructor.
56 */
SoTextureCoordinateCache(SoState * const state)57 SoTextureCoordinateCache::SoTextureCoordinateCache(SoState * const state)
58 : SoCache(state)
59 {
60 PRIVATE(this) = new SoTextureCoordinateCacheP;
61 }
62
63 /*!
64 Destructor.
65 */
~SoTextureCoordinateCache()66 SoTextureCoordinateCache::~SoTextureCoordinateCache()
67 {
68 delete PRIVATE(this);
69 }
70
71 /*!
72 Generates texture coordinates based on the bounding box of the
73 geometry. This is usually called default texture coordinates
74 in OIV.
75 */
76 void
generate(const SbBox3f & bbox,const SbVec3f * vertices,const int numvertices)77 SoTextureCoordinateCache::generate(const SbBox3f & bbox,
78 const SbVec3f * vertices,
79 const int numvertices)
80 {
81 // FIXME: Support 3D texture coordinates. This functionality
82 // is more or less a duplicate of that in SoTextureCoordinateBundle
83 // (kintel 20020203)
84 float sizes[3];
85 float minvalues[3];
86 int offsets[3];
87
88 bbox.getSize(sizes[0], sizes[1], sizes[2]);
89 minvalues[0] = bbox.getMin()[0];
90 minvalues[1] = bbox.getMin()[1];
91 minvalues[2] = bbox.getMin()[2];
92 offsets[0] = 0;
93 offsets[1] = 1;
94 offsets[2] = 2;
95
96 // bubblesort :-)
97 if (sizes[0] < sizes[1]) {
98 SbSwap(sizes[0], sizes[1]);
99 SbSwap(minvalues[0], minvalues[1]);
100 SbSwap(offsets[0], offsets[1]);
101 }
102 if (sizes[1] < sizes[2]) {
103 SbSwap(sizes[1], sizes[2]);
104 SbSwap(minvalues[1], minvalues[2]);
105 SbSwap(offsets[1], offsets[2]);
106 }
107 if (sizes[0] < sizes[1]) {
108 SbSwap(sizes[0], sizes[1]);
109 SbSwap(minvalues[0], minvalues[1]);
110 SbSwap(offsets[0], offsets[1]);
111 }
112
113 float s, t;
114 for (int i = 0; i < numvertices; i++) {
115 s = vertices[i][offsets[0]];
116 t = vertices[i][offsets[1]];
117 s -= minvalues[0];
118 t -= minvalues[1];
119 s /= sizes[0];
120 t /= sizes[1];
121 // expand list array as needed
122 if (i >= PRIVATE(this)->texCoords.getLength()) PRIVATE(this)->texCoords.append(SbVec2f());
123 PRIVATE(this)->texCoords[i].setValue(s, t);
124 }
125
126 // fit list array in case we used to have more items than now
127 PRIVATE(this)->texCoords.truncate(numvertices);
128 }
129
130 /*!
131 Returns the generated texture coordinates.
132 */
133 const SbVec2f *
get(void) const134 SoTextureCoordinateCache::get(void) const
135 {
136 return PRIVATE(this)->texCoords.getArrayPtr();
137 }
138
139 /*!
140 Returns the number of generated texture coordinates.
141 */
142 int
getNum(void) const143 SoTextureCoordinateCache::getNum(void) const
144 {
145 return PRIVATE(this)->texCoords.getLength();
146 }
147
148 #undef PRIVATE
149