source: trunk/examples/opengl/pbuffers/cube.cpp@ 561

Last change on this file since 561 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.

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1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
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15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
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25** rights. These rights are described in the Nokia Qt LGPL Exception
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28** GNU General Public License Usage
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30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
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40****************************************************************************/
41
42#include "cube.h"
43#include "glwidget.h"
44
45#include <QtGui/QImage>
46#include <QtCore/QPropertyAnimation>
47
48static const qreal FACE_SIZE = 0.4;
49
50static const qreal speeds[] = { 1.8f, 2.4f, 3.6f };
51static const qreal amplitudes[] = { 2.0f, 2.5f, 3.0f };
52
53static inline void qSetColor(float colorVec[], QColor c)
54{
55 colorVec[0] = c.redF();
56 colorVec[1] = c.greenF();
57 colorVec[2] = c.blueF();
58 colorVec[3] = c.alphaF();
59}
60
61int Geometry::append(const QVector3D &a, const QVector3D &n, const QVector2D &t)
62{
63 int v = vertices.count();
64 vertices.append(a);
65 normals.append(n);
66 texCoords.append(t);
67 faces.append(v);
68 colors.append(QVector4D(0.6f, 0.6f, 0.6f, 1.0f));
69 return v;
70}
71
72void Geometry::addQuad(const QVector3D &a, const QVector3D &b,
73 const QVector3D &c, const QVector3D &d,
74 const QVector<QVector2D> &tex)
75{
76 QVector3D norm = QVector3D::normal(a, b, c);
77 // append first triangle
78 int aref = append(a, norm, tex[0]);
79 append(b, norm, tex[1]);
80 int cref = append(c, norm, tex[2]);
81 // append second triangle
82 faces.append(aref);
83 faces.append(cref);
84 append(d, norm, tex[3]);
85}
86
87void Geometry::loadArrays() const
88{
89 glEnableClientState(GL_VERTEX_ARRAY);
90 glEnableClientState(GL_NORMAL_ARRAY);
91 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
92 glEnableClientState(GL_COLOR_ARRAY);
93 glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
94 glNormalPointer(GL_FLOAT, 0, normals.constData());
95 glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
96 glColorPointer(4, GL_FLOAT, 0, colors.constData());
97}
98
99void Geometry::setColors(int start, GLfloat colorArray[4][4])
100{
101 int off = faces[start];
102 for (int i = 0; i < 4; ++i)
103 colors[i + off] = QVector4D(colorArray[i][0],
104 colorArray[i][1],
105 colorArray[i][2],
106 colorArray[i][3]);
107}
108
109Tile::Tile(const QVector3D &loc)
110 : location(loc)
111 , start(0)
112 , count(0)
113 , useFlatColor(false)
114 , geom(0)
115{
116 qSetColor(faceColor, QColor(Qt::darkGray));
117}
118
119void Tile::setColors(GLfloat colorArray[4][4])
120{
121 useFlatColor = true;
122 geom->setColors(start, colorArray);
123}
124
125static inline void qMultMatrix(const QMatrix4x4 &mat)
126{
127 if (sizeof(qreal) == sizeof(GLfloat))
128 glMultMatrixf((GLfloat*)mat.constData());
129#ifndef QT_OPENGL_ES
130 else if (sizeof(qreal) == sizeof(GLdouble))
131 glMultMatrixd((GLdouble*)mat.constData());
132#endif
133 else
134 {
135 GLfloat fmat[16];
136 qreal const *r = mat.constData();
137 for (int i = 0; i < 16; ++i)
138 fmat[i] = r[i];
139 glMultMatrixf(fmat);
140 }
141}
142
143void Tile::draw() const
144{
145 QMatrix4x4 mat;
146 mat.translate(location);
147 mat.rotate(orientation);
148 glMatrixMode(GL_MODELVIEW);
149 glPushMatrix();
150 qMultMatrix(mat);
151 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, faceColor);
152 glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, geom->indices() + start);
153 glPopMatrix();
154}
155
156TileBuilder::TileBuilder(Geometry *g, qreal depth, qreal size)
157 : verts(4)
158 , tex(4)
159 , start(g->count())
160 , count(0)
161 , geom(g)
162{
163 // front face - make a square with bottom-left at origin
164 verts[br].setX(size);
165 verts[tr].setX(size);
166 verts[tr].setY(size);
167 verts[tl].setY(size);
168
169 // these vert numbers are good for the tex-coords
170 for (int i = 0; i < 4; ++i)
171 tex[i] = verts[i].toVector2D();
172
173 // now move verts half cube width across so cube is centered on origin
174 for (int i = 0; i < 4; ++i)
175 verts[i] -= QVector3D(size / 2.0f, size / 2.0f, -depth);
176
177 // add the front face
178 g->addQuad(verts[bl], verts[br], verts[tr], verts[tl], tex);
179
180 count = g->count() - start;
181}
182
183void TileBuilder::initialize(Tile *tile) const
184{
185 tile->start = start;
186 tile->count = count;
187 tile->geom = geom;
188 qSetColor(tile->faceColor, color);
189}
190
191Tile *TileBuilder::newTile(const QVector3D &loc) const
192{
193 Tile *tile = new Tile(loc);
194 initialize(tile);
195 return tile;
196}
197
198Cube::Cube(const QVector3D &loc)
199 : Tile(loc)
200 , rot(0.0f)
201 , r(0), a(0)
202{
203}
204
205Cube::~Cube()
206{
207}
208
209void Cube::setAltitude(qreal a)
210{
211 if (location.y() != a)
212 {
213 location.setY(a);
214 emit changed();
215 }
216}
217
218void Cube::setRange(qreal r)
219{
220 if (location.x() != r)
221 {
222 location.setX(r);
223 emit changed();
224 }
225}
226
227void Cube::setRotation(qreal r)
228{
229 if (r != rot)
230 {
231 orientation = QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 1.0f, 1.0f), r);
232 emit changed();
233 }
234}
235
236void Cube::removeBounce()
237{
238 delete a;
239 a = 0;
240 delete r;
241 r = 0;
242}
243
244void Cube::startAnimation()
245{
246 if (r)
247 {
248 r->start();
249 r->setCurrentTime(startx);
250 }
251 if (a)
252 a->start();
253 if (rtn)
254 rtn->start();
255}
256
257void Cube::setAnimationPaused(bool paused)
258{
259 if (paused)
260 {
261 if (r)
262 r->pause();
263 if (a)
264 a->pause();
265 if (rtn)
266 rtn->pause();
267 }
268 else
269 {
270 if (r)
271 r->resume();
272 if (a)
273 a->resume();
274 if (rtn)
275 rtn->resume();
276 }
277}
278
279CubeBuilder::CubeBuilder(Geometry *g, qreal depth, qreal size)
280 : TileBuilder(g, depth)
281 , ix(0)
282{
283 for (int i = 0; i < 4; ++i)
284 verts[i].setZ(size / 2.0f);
285 // back face - "extrude" verts down
286 QVector<QVector3D> back(verts);
287 for (int i = 0; i < 4; ++i)
288 back[i].setZ(-size / 2.0f);
289
290 // add the back face
291 g->addQuad(back[br], back[bl], back[tl], back[tr], tex);
292
293 // add the sides
294 g->addQuad(back[bl], back[br], verts[br], verts[bl], tex);
295 g->addQuad(back[br], back[tr], verts[tr], verts[br], tex);
296 g->addQuad(back[tr], back[tl], verts[tl], verts[tr], tex);
297 g->addQuad(back[tl], back[bl], verts[bl], verts[tl], tex);
298
299 count = g->count() - start;
300}
301
302Cube *CubeBuilder::newCube(const QVector3D &loc) const
303{
304 Cube *c = new Cube(loc);
305 initialize(c);
306 qreal d = 4000.0f;
307 qreal d3 = d / 3.0f;
308 // Animate movement from left to right
309 c->r = new QPropertyAnimation(c, "range");
310 c->r->setStartValue(-1.3f);
311 c->r->setEndValue(1.3f);
312 c->startx = ix * d3 * 3.0f;
313 c->r->setDuration(d * 4.0f);
314 c->r->setLoopCount(-1);
315 c->r->setEasingCurve(QEasingCurve(QEasingCurve::CosineCurve));
316 // Animate movement from bottom to top
317 c->a = new QPropertyAnimation(c, "altitude");
318 c->a->setEndValue(loc.y());
319 c->a->setStartValue(loc.y() + amplitudes[ix]);
320 c->a->setDuration(d / speeds[ix]);
321 c->a->setLoopCount(-1);
322 c->a->setEasingCurve(QEasingCurve(QEasingCurve::CosineCurve));
323 // Animate rotation
324 c->rtn = new QPropertyAnimation(c, "rotation");
325 c->rtn->setStartValue(c->rot);
326 c->rtn->setEndValue(359.0f);
327 c->rtn->setDuration(d * 2.0f);
328 c->rtn->setLoopCount(-1);
329 c->rtn->setDuration(d / 2);
330 ix = (ix + 1) % 3;
331 return c;
332}
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