source: trunk/examples/opengl/framebufferobject/glwidget.cpp@ 1023

Last change on this file since 1023 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: 10.3 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|QGL::AlphaChannel), parent)
52{
53 setWindowTitle(tr("OpenGL framebuffer objects"));
54 makeCurrent();
55
56 if (QGLFramebufferObject::hasOpenGLFramebufferBlit()) {
57 QGLFramebufferObjectFormat format;
58 format.setSamples(4);
59 format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
60
61 render_fbo = new QGLFramebufferObject(512, 512, format);
62 texture_fbo = new QGLFramebufferObject(512, 512);
63 } else {
64 render_fbo = new QGLFramebufferObject(1024, 1024);
65 texture_fbo = render_fbo;
66 }
67
68 rot_x = rot_y = rot_z = 0.0f;
69 scale = 0.1f;
70 anim = new QTimeLine(750, this);
71 anim->setUpdateInterval(20);
72 connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
73 connect(anim, SIGNAL(finished()), SLOT(animFinished()));
74
75 svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
76 connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
77
78 logo = QImage(":/res/designer.png");
79 logo = logo.convertToFormat(QImage::Format_ARGB32);
80
81 tile_list = glGenLists(1);
82 glNewList(tile_list, GL_COMPILE);
83 glBegin(GL_QUADS);
84 {
85 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
86 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
87 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
88 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
89
90 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
91 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
92 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
93 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
94
95 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
96 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
97 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
98 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
99
100 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
101 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
102 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
103 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
104
105 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
106 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
107 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
108 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
109
110 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
111 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
112 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
113 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
114 }
115 glEnd();
116 glEndList();
117
118 wave = new GLfloat[logo.width()*logo.height()];
119 memset(wave, 0, logo.width()*logo.height());
120 startTimer(30); // wave timer
121}
122
123GLWidget::~GLWidget()
124{
125 delete[] wave;
126 glDeleteLists(tile_list, 1);
127 delete texture_fbo;
128 if (render_fbo != texture_fbo)
129 delete render_fbo;
130}
131
132void GLWidget::paintEvent(QPaintEvent *)
133{
134 draw();
135}
136
137void GLWidget::draw()
138{
139 QPainter p(this); // used for text overlay
140
141 // save the GL state set for QPainter
142 saveGLState();
143
144 // render the 'bubbles.svg' file into our framebuffer object
145 QPainter fbo_painter(render_fbo);
146 svg_renderer->render(&fbo_painter);
147 fbo_painter.end();
148
149 if (render_fbo != texture_fbo) {
150 QRect rect(0, 0, render_fbo->width(), render_fbo->height());
151 QGLFramebufferObject::blitFramebuffer(texture_fbo, rect,
152 render_fbo, rect);
153 }
154
155 // draw into the GL widget
156 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
157 glMatrixMode(GL_PROJECTION);
158 glLoadIdentity();
159 glFrustum(-1, 1, -1, 1, 10, 100);
160 glTranslatef(0.0f, 0.0f, -15.0f);
161 glMatrixMode(GL_MODELVIEW);
162 glLoadIdentity();
163 glViewport(0, 0, width(), height());
164 glEnable(GL_BLEND);
165 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
166
167 glBindTexture(GL_TEXTURE_2D, texture_fbo->texture());
168 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
169 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
170 glEnable(GL_TEXTURE_2D);
171 glEnable(GL_MULTISAMPLE);
172 glEnable(GL_CULL_FACE);
173
174 // draw background
175 glPushMatrix();
176 glScalef(1.7f, 1.7f, 1.7f);
177 glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
178 glCallList(tile_list);
179 glPopMatrix();
180
181 const int w = logo.width();
182 const int h = logo.height();
183
184 glRotatef(rot_x, 1.0f, 0.0f, 0.0f);
185 glRotatef(rot_y, 0.0f, 1.0f, 0.0f);
186 glRotatef(rot_z, 0.0f, 0.0f, 1.0f);
187 glScalef(scale/w, scale/w, scale/w);
188
189 glDepthFunc(GL_LESS);
190 glEnable(GL_DEPTH_TEST);
191 // draw the Qt icon
192 glTranslatef(-w+1, -h+1, 0.0f);
193 for (int y=h-1; y>=0; --y) {
194 uint *p = (uint*) logo.scanLine(y);
195 uint *end = p + w;
196 int x = 0;
197 while (p < end) {
198 glColor4ub(qRed(*p), qGreen(*p), qBlue(*p), uchar(qAlpha(*p)*.9));
199 glTranslatef(0.0f, 0.0f, wave[y*w+x]);
200 if (qAlpha(*p) > 128)
201 glCallList(tile_list);
202 glTranslatef(0.0f, 0.0f, -wave[y*w+x]);
203 glTranslatef(2.0f, 0.0f, 0.0f);
204 ++x;
205 ++p;
206 }
207 glTranslatef(-w*2.0f, 2.0f, 0.0f);
208 }
209
210 // restore the GL state that QPainter expects
211 restoreGLState();
212
213 // draw the overlayed text using QPainter
214 p.setPen(QColor(197, 197, 197, 157));
215 p.setBrush(QColor(197, 197, 197, 127));
216 p.drawRect(QRect(0, 0, width(), 50));
217 p.setPen(Qt::black);
218 p.setBrush(Qt::NoBrush);
219 const QString str1(tr("A simple OpenGL framebuffer object example."));
220 const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."));
221 QFontMetrics fm(p.font());
222 p.drawText(width()/2 - fm.width(str1)/2, 20, str1);
223 p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2);
224}
225
226void GLWidget::mousePressEvent(QMouseEvent *e)
227{
228 anchor = e->pos();
229}
230
231void GLWidget::mouseMoveEvent(QMouseEvent *e)
232{
233 QPoint diff = e->pos() - anchor;
234 if (e->buttons() & Qt::LeftButton) {
235 rot_x += diff.y()/5.0f;
236 rot_y += diff.x()/5.0f;
237 } else if (e->buttons() & Qt::RightButton) {
238 rot_z += diff.x()/5.0f;
239 }
240
241 anchor = e->pos();
242 draw();
243}
244
245void GLWidget::wheelEvent(QWheelEvent *e)
246{
247 e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f;
248 draw();
249}
250
251void GLWidget::mouseDoubleClickEvent(QMouseEvent *)
252{
253 anim->start();
254}
255
256void GLWidget::animate(qreal val)
257{
258 rot_y = val * 180;
259 draw();
260}
261
262void GLWidget::animFinished()
263{
264 if (anim->direction() == QTimeLine::Forward)
265 anim->setDirection(QTimeLine::Backward);
266 else
267 anim->setDirection(QTimeLine::Forward);
268}
269
270void GLWidget::saveGLState()
271{
272 glPushAttrib(GL_ALL_ATTRIB_BITS);
273 glMatrixMode(GL_PROJECTION);
274 glPushMatrix();
275 glMatrixMode(GL_MODELVIEW);
276 glPushMatrix();
277}
278
279void GLWidget::restoreGLState()
280{
281 glMatrixMode(GL_PROJECTION);
282 glPopMatrix();
283 glMatrixMode(GL_MODELVIEW);
284 glPopMatrix();
285 glPopAttrib();
286}
287
288#define PI 3.14159
289
290void GLWidget::timerEvent(QTimerEvent *)
291{
292 if (QApplication::mouseButtons() != 0)
293 return;
294
295 static bool scale_in = true;
296
297 if (scale_in && scale > 35.0f)
298 scale_in = false;
299 else if (!scale_in && scale < .5f)
300 scale_in = true;
301
302 scale = scale_in ? scale + scale*0.01f : scale-scale*0.01f;
303 rot_z += 0.3f;
304 rot_x += 0.1f;
305
306 int dx, dy; // disturbance point
307 float s, v, W, t;
308 int i, j;
309 static float wt[128][128];
310 const int width = logo.width();
311 const int AMP = 5;
312
313 dx = dy = width >> 1;
314
315 W = .3f;
316 v = -4; // wave speed
317
318 for (i = 0; i < width; ++i) {
319 for ( j = 0; j < width; ++j) {
320 s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
321 wt[i][j] += 0.1f;
322 t = s / v;
323 if (s != 0)
324 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
325 else
326 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
327 }
328 }
329}
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