source: trunk/examples/opengl/pbuffers2/glwidget.cpp@ 983

Last change on this file since 983 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 10.1 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:BSD$
10** You may use this file under the terms of the BSD license as follows:
11**
12** "Redistribution and use in source and binary forms, with or without
13** modification, are permitted provided that the following conditions are
14** met:
15** * Redistributions of source code must retain the above copyright
16** notice, this list of conditions and the following disclaimer.
17** * Redistributions in binary form must reproduce the above copyright
18** notice, this list of conditions and the following disclaimer in
19** the documentation and/or other materials provided with the
20** distribution.
21** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
22** the names of its contributors may be used to endorse or promote
23** products derived from this software without specific prior written
24** permission.
25**
26** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
37** $QT_END_LICENSE$
38**
39****************************************************************************/
40
41#include <QtGui/QImage>
42#include "glwidget.h"
43
44#include <math.h>
45
46#ifndef GL_MULTISAMPLE
47#define GL_MULTISAMPLE 0x809D
48#endif
49
50GLWidget::GLWidget(QWidget *parent)
51 : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
52{
53 setWindowTitle(tr("OpenGL pbuffers 2"));
54
55 pbuffer = new QGLPixelBuffer(1024, 1024, format(), this);
56
57 rot_x = rot_y = rot_z = 0.0f;
58 scale = 0.1f;
59 anim = new QTimeLine(750, this);
60 anim->setUpdateInterval(20);
61 connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
62 connect(anim, SIGNAL(finished()), SLOT(animFinished()));
63
64 svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
65 connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
66
67 logo = QImage(":/res/designer.png");
68 logo = logo.convertToFormat(QImage::Format_ARGB32);
69
70 makeCurrent(); // need a current context to create the display list
71 tile_list = glGenLists(1);
72 glNewList(tile_list, GL_COMPILE);
73 glBegin(GL_QUADS);
74 {
75 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
76 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
77 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
78 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
79
80 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
81 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
82 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
83 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
84
85 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
86 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
87 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
88 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
89
90 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
91 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
92 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
93 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
94
95 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
96 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
97 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
98 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
99
100 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
101 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
102 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
103 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
104}
105 glEnd();
106 glEndList();
107
108 wave = new GLfloat[logo.width()*logo.height()];
109 memset(wave, 0, logo.width()*logo.height());
110 startTimer(30); // wave timer
111
112 pbuffer->makeCurrent();
113 dynamicTexture = pbuffer->generateDynamicTexture();
114
115 // bind the dynamic texture to the pbuffer - this is a no-op under X11
116 hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
117}
118
119GLWidget::~GLWidget()
120{
121 delete[] wave;
122 glDeleteLists(tile_list, 1);
123 pbuffer->releaseFromDynamicTexture();
124 glDeleteTextures(1, &dynamicTexture);
125 delete pbuffer;
126}
127
128void GLWidget::paintEvent(QPaintEvent *)
129{
130 draw();
131}
132
133void GLWidget::draw()
134{
135 QPainter p(this); // used for text overlay
136
137 // save the GL state set for QPainter
138 p.beginNativePainting();
139 saveGLState();
140
141 // render the 'bubbles.svg' file into our pbuffer
142 QPainter pbuffer_painter(pbuffer);
143 svg_renderer->render(&pbuffer_painter);
144 pbuffer_painter.end();
145 glFlush();
146
147 // rendering directly to a texture is not supported on X11 and
148 // some Windows implementations, unfortunately
149 if (!hasDynamicTextureUpdate)
150 pbuffer->updateDynamicTexture(dynamicTexture);
151
152 makeCurrent();
153 // draw into the GL widget
154 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
155 glMatrixMode(GL_PROJECTION);
156 glLoadIdentity();
157 glFrustum(-1, 1, -1, 1, 10, 100);
158 glTranslatef(0.0f, 0.0f, -15.0f);
159 glMatrixMode(GL_MODELVIEW);
160 glLoadIdentity();
161 glViewport(0, 0, width(), height());
162
163 glBindTexture(GL_TEXTURE_2D, dynamicTexture);
164 glEnable(GL_TEXTURE_2D);
165 glEnable(GL_MULTISAMPLE);
166 glEnable(GL_CULL_FACE);
167 glEnable(GL_BLEND);
168 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
169
170 // draw background
171 glPushMatrix();
172 glScalef(1.7f, 1.7f, 1.7f);
173 glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
174 glCallList(tile_list);
175 glPopMatrix();
176
177 const int w = logo.width();
178 const int h = logo.height();
179
180 glRotatef(rot_x, 1.0f, 0.0f, 0.0f);
181 glRotatef(rot_y, 0.0f, 1.0f, 0.0f);
182 glRotatef(rot_z, 0.0f, 0.0f, 1.0f);
183 glScalef(scale/w, scale/w, scale/w);
184
185 glDepthFunc(GL_LESS);
186 glEnable(GL_DEPTH_TEST);
187
188 // draw the Qt icon
189 glTranslatef(-w+1, -h+1, 0.0f);
190 for (int y=h-1; y>=0; --y) {
191 uint *p = (uint*) logo.scanLine(y);
192 uint *end = p + w;
193 int x = 0;
194 while (p < end) {
195 glColor4ub(qRed(*p), qGreen(*p), qBlue(*p), uchar(qAlpha(*p)*.9));
196 glTranslatef(0.0f, 0.0f, wave[y*w+x]);
197 if (qAlpha(*p) > 128)
198 glCallList(tile_list);
199 glTranslatef(0.0f, 0.0f, -wave[y*w+x]);
200 glTranslatef(2.0f, 0.0f, 0.0f);
201 ++x;
202 ++p;
203 }
204 glTranslatef(-w*2.0f, 2.0f, 0.0f);
205 }
206
207 // restore the GL state that QPainter expects
208 restoreGLState();
209 p.endNativePainting();
210
211 // draw the overlayed text using QPainter
212 p.setPen(QColor(197, 197, 197, 157));
213 p.setBrush(QColor(197, 197, 197, 127));
214 p.drawRect(QRect(0, 0, width(), 50));
215 p.setPen(Qt::black);
216 p.setBrush(Qt::NoBrush);
217 const QString str1(tr("A simple OpenGL pbuffer example."));
218 const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."));
219 QFontMetrics fm(p.font());
220 p.drawText(width()/2 - fm.width(str1)/2, 20, str1);
221 p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2);
222}
223
224void GLWidget::mousePressEvent(QMouseEvent *e)
225{
226 anchor = e->pos();
227}
228
229void GLWidget::mouseMoveEvent(QMouseEvent *e)
230{
231 QPoint diff = e->pos() - anchor;
232 if (e->buttons() & Qt::LeftButton) {
233 rot_x += diff.y()/5.0f;
234 rot_y += diff.x()/5.0f;
235 } else if (e->buttons() & Qt::RightButton) {
236 rot_z += diff.x()/5.0f;
237 }
238
239 anchor = e->pos();
240 draw();
241}
242
243void GLWidget::wheelEvent(QWheelEvent *e)
244{
245 e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f;
246 draw();
247}
248
249void GLWidget::mouseDoubleClickEvent(QMouseEvent *)
250{
251 anim->start();
252}
253
254void GLWidget::animate(qreal val)
255{
256 rot_y = val * 180;
257 draw();
258}
259
260void GLWidget::animFinished()
261{
262 if (anim->direction() == QTimeLine::Forward)
263 anim->setDirection(QTimeLine::Backward);
264 else
265 anim->setDirection(QTimeLine::Forward);
266}
267
268void GLWidget::saveGLState()
269{
270 glPushAttrib(GL_ALL_ATTRIB_BITS);
271 glMatrixMode(GL_PROJECTION);
272 glPushMatrix();
273 glMatrixMode(GL_MODELVIEW);
274 glPushMatrix();
275}
276
277void GLWidget::restoreGLState()
278{
279 glMatrixMode(GL_PROJECTION);
280 glPopMatrix();
281 glMatrixMode(GL_MODELVIEW);
282 glPopMatrix();
283 glPopAttrib();
284}
285
286#define PI 3.14159
287
288void GLWidget::timerEvent(QTimerEvent *)
289{
290 if (QApplication::mouseButtons() != 0)
291 return;
292
293 static bool scale_in = true;
294
295 if (scale_in && scale > 35.0f)
296 scale_in = false;
297 else if (!scale_in && scale < .5f)
298 scale_in = true;
299
300 scale = scale_in ? scale + scale*0.01f : scale-scale*0.01f;
301 rot_z += 0.3f;
302 rot_x += 0.1f;
303
304 int dx, dy; // disturbance point
305 float s, v, W, t;
306 int i, j;
307 static float wt[128][128];
308 const int width = logo.width();
309 const int AMP = 5;
310
311 dx = dy = width >> 1;
312
313 W = .3f;
314 v = -4; // wave speed
315
316 for (i = 0; i < width; ++i) {
317 for ( j = 0; j < width; ++j) {
318 s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
319 wt[i][j] += 0.1f;
320 t = s / v;
321 if (s != 0)
322 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
323 else
324 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
325 }
326 }
327}
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