facegeometry.cpp 10.4 KB
Newer Older
1
2
// ================================================================================================
// 
schultezub's avatar
schultezub committed
3
// This file is part of the CAMPVis Software Framework.
4
5
// 
// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
schultezub's avatar
schultezub committed
6
//      Christian Schulte zu Berge <christian.szb@in.tum.de>
7
//      Chair for Computer Aided Medical Procedures
8
9
//      Technische Universität München
//      Boltzmannstr. 3, 85748 Garching b. München, Germany
schultezub's avatar
schultezub committed
10
// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
// 
// The licensing of this softare is not yet resolved. Until then, redistribution in source or
// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
// However, the names of the original authors and the above copyright notice must retain in its
// original state in any case.
// 
// Legal disclaimer provided by the BSD license:
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// 
// ================================================================================================

#include "facegeometry.h"

#include "tgt/assert.h"
#include "tgt/logmanager.h"
#include "tgt/buffer.h"
#include "tgt/vertexarrayobject.h"
36
#include "tgt/vector.h"
37

schultezub's avatar
schultezub committed
38
namespace campvis {
39

schultezub's avatar
schultezub committed
40
    const std::string FaceGeometry::loggerCat_ = "CAMPVis.core.datastructures.FaceGeometry";
41

42
43
44
45
46
47
48
    FaceGeometry::FaceGeometry()
        : GeometryData()
        , _faceNormal(0.f)
    {

    }

49
    FaceGeometry::FaceGeometry(const std::vector<tgt::vec3>& vertices, const std::vector<tgt::vec3>& textureCoordinates /*= std::vector<tgt::vec3>()*/, const std::vector<tgt::vec4>& colors /*= std::vector<tgt::vec4>()*/, const std::vector<tgt::vec3>& normals /*= std::vector<tgt::vec3>() */)
50
        : GeometryData()
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
        , _vertices(vertices)
        , _textureCoordinates(textureCoordinates)
        , _colors(colors)
        , _normals(normals)
        , _faceNormal(0.f)
    {
        tgtAssert(textureCoordinates.empty() || textureCoordinates.size() == vertices.size(), "Texture coordinates vector must be either empty or of the same size as the vertex vector.");
        tgtAssert(colors.empty() || colors.size() == vertices.size(), "Colors vector must be either empty or of the same size as the vertex vector.");
        tgtAssert(normals.empty() || normals.size() == vertices.size(), "Normals vector must be either empty or of the same size as the vertex vector.");

        // compute normal (class invariant states, that all vertices lie in the same plane):
        if (_vertices.size() > 2) {
            _faceNormal = tgt::normalize(tgt::cross(vertices[1] - vertices[0], vertices[2] - vertices[0]));
        }
    }

    FaceGeometry::~FaceGeometry() {
68

69
70
71
72
73
74
    }

    FaceGeometry* FaceGeometry::clone() const {
        return new FaceGeometry(_vertices, _textureCoordinates, _colors, _normals);
    }

75
76
77
78
79
80
81
82
83
84
85
86
87
88
    size_t FaceGeometry::getLocalMemoryFootprint() const {
        size_t sum = 0;
        if (_verticesBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_texCoordsBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_colorsBuffer != 0)
            sum += sizeof(tgt::BufferObject);
        if (_normalsBuffer != 0)
            sum += sizeof(tgt::BufferObject);

        return sizeof(*this) + sum + (sizeof(tgt::vec3) * (_vertices.size() + _textureCoordinates.size() + _normals.size())) + (sizeof(tgt::vec4) * _colors.size());
    }

89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
    size_t FaceGeometry::size() const {
        return _vertices.size();
    }

    const std::vector<tgt::vec3>& FaceGeometry::getVertices() const {
        return _vertices;
    }

    const std::vector<tgt::vec4>& FaceGeometry::getColors() const {
        return _colors;
    }

    const std::vector<tgt::vec3>& FaceGeometry::getNormals() const {
        return _normals;
    }

    const std::vector<tgt::vec3>& FaceGeometry::getTextureCoordinates() const {
        return _textureCoordinates;
    }

    const tgt::vec3& FaceGeometry::getFaceNormal() const {
        return _faceNormal;
    }

113
    void FaceGeometry::render(GLenum mode) const {
114
        createGLBuffers();
115
        if (_buffersDirty) {
116
117
118
119
120
121
            LERROR("Cannot render without initialized OpenGL buffers.");
            return;
        }

        tgt::VertexArrayObject vao;
        if (_verticesBuffer)
122
            vao.setVertexAttributePointer(0, _verticesBuffer);
123
        if (_texCoordsBuffer)
124
            vao.setVertexAttributePointer(1, _texCoordsBuffer);
125
        if (_colorsBuffer)
126
            vao.setVertexAttributePointer(2, _colorsBuffer);
127
        if (_normalsBuffer)
128
            vao.setVertexAttributePointer(3, _normalsBuffer);
129
        LGL_ERROR;
130

131
        glDrawArrays(mode, 0, static_cast<GLsizei>(_vertices.size()));
132
        LGL_ERROR;
133
134
    }

135
    void FaceGeometry::createGLBuffers() const {
136
137
        if (_buffersDirty) {
            deleteBuffers();
138

139
            try {
140
141
                _verticesBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                _verticesBuffer->data(&_vertices.front(), _vertices.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);
142
143

                if (! _textureCoordinates.empty()) {
144
145
                    _texCoordsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _texCoordsBuffer->data(&_textureCoordinates.front(), _textureCoordinates.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);
146
147
                }
                if (! _colors.empty()) {
148
149
                    _colorsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _colorsBuffer->data(&_colors.front(), _colors.size() * sizeof(tgt::vec4), tgt::BufferObject::FLOAT, 4);
150
151
                }
                if (! _normals.empty()) {
152
153
                    _normalsBuffer = new tgt::BufferObject(tgt::BufferObject::ARRAY_BUFFER, tgt::BufferObject::USAGE_STATIC_DRAW);
                    _normalsBuffer->data(&_normals.front(), _normals.size() * sizeof(tgt::vec3), tgt::BufferObject::FLOAT, 3);
154
155
156
157
                }
            }
            catch (tgt::Exception& e) {
                LERROR("Error creating OpenGL Buffer objects: " << e.what());
158
                _buffersDirty = true;
159
160
161
                return;
            }

162
            LGL_ERROR;
163
            _buffersDirty = false;
164
165
166
        }
    }

167
168
169
170
171
172
173
174
175
176
    namespace {
        float distanceToPlane(const tgt::vec3& vertex, float p, const tgt::vec3& pNormal, float epsilon) {
            float distance = tgt::dot(pNormal, vertex) - p;
            if (std::abs(distance) <= epsilon)
                return 0;
            else
                return distance;
        }
    }

177
    campvis::FaceGeometry FaceGeometry::clipAgainstPlane(float p, const tgt::vec3& pNormal, float epsilon /*= 1e-4f*/) const {
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
        tgtAssert(epsilon >= 0, "Epsilon must be positive.");

        std::vector<tgt::vec3> verts, texCoords, norms;
        std::vector<tgt::vec4> cols;
        size_t lastIndex = _vertices.size() - 1;
        float lastDistance = distanceToPlane(_vertices.back(), p, pNormal, epsilon);

        // Implementation of Sutherland-Hodgman polygon clipping:
        for (size_t i = 0; i < _vertices.size(); ++i) {
            float currrentDistance = distanceToPlane(_vertices[i], p, pNormal, epsilon);

            // case 1: last vertex outside, this vertex inside clip region => clip
            if (lastDistance > 0 && currrentDistance <= 0) {
                float t = lastDistance / (lastDistance - currrentDistance);
                
                verts.push_back(tgt::mix(_vertices[lastIndex], _vertices[i], t));
                if (!_textureCoordinates.empty())
                    texCoords.push_back(tgt::mix(_textureCoordinates[lastIndex], _textureCoordinates[i], t));
                if (!_colors.empty())
                    cols.push_back(tgt::mix(_colors[lastIndex], _colors[i], t));
                if (!_normals.empty())
                    norms.push_back(tgt::mix(_normals[lastIndex], _normals[i], t));
            }
            // case 2: last vertex inside, this vertex outside clip region => clip
            else if (lastDistance <= 0 && currrentDistance > 0) {
                float t = lastDistance / (lastDistance - currrentDistance);

                verts.push_back(tgt::mix(_vertices[lastIndex], _vertices[i], t));
                if (!_textureCoordinates.empty())
                    texCoords.push_back(tgt::mix(_textureCoordinates[lastIndex], _textureCoordinates[i], t));
                if (!_colors.empty())
                    cols.push_back(tgt::mix(_colors[lastIndex], _colors[i], t));
                if (!_normals.empty())
                    norms.push_back(tgt::mix(_normals[lastIndex], _normals[i], t));
            }

            // case 1.2 + case 3: current vertix in front of plane => keep
            if (currrentDistance <= 0) {
                verts.push_back(_vertices[i]);
                if (!_textureCoordinates.empty())
                    texCoords.push_back(_textureCoordinates[i]);
                if (!_colors.empty())
                    cols.push_back(_colors[i]);
                if (!_normals.empty())
                    norms.push_back(_normals[i]);
            }

            lastIndex = i;
            lastDistance = currrentDistance;
        }

        return FaceGeometry(verts, texCoords, cols, norms);
    }

232
233
234
235
236
237
238
    tgt::Bounds FaceGeometry::getWorldBounds() const {
        tgt::Bounds toReturn;
        for (std::vector<tgt::vec3>::const_iterator it = _vertices.begin(); it != _vertices.end(); ++it)
            toReturn.addPoint(*it);
        return toReturn;
    }

239
}