source: trunk/examples/opengl/pbuffers2/glwidget.cpp@ 5

Last change on this file since 5 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 10.0 KB
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1/****************************************************************************
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3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
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6** This file is part of the examples of the Qt Toolkit.
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41
42#include <QtGui/QImage>
43#include "glwidget.h"
44
45#include <math.h>
46
47#ifndef GL_MULTISAMPLE
48#define GL_MULTISAMPLE 0x809D
49#endif
50
51GLWidget::GLWidget(QWidget *parent)
52 : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
53{
54 setWindowTitle(tr("OpenGL pbuffers 2"));
55
56 pbuffer = new QGLPixelBuffer(1024, 1024, format(), this);
57
58 rot_x = rot_y = rot_z = 0.0f;
59 scale = 0.1f;
60 anim = new QTimeLine(750, this);
61 anim->setUpdateInterval(20);
62 connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
63 connect(anim, SIGNAL(finished()), SLOT(animFinished()));
64
65 svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
66 connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
67
68 logo = QImage(":/res/designer.png");
69 logo = logo.convertToFormat(QImage::Format_ARGB32);
70
71 makeCurrent(); // need a current context to create the display list
72 tile_list = glGenLists(1);
73 glNewList(tile_list, GL_COMPILE);
74 glBegin(GL_QUADS);
75 {
76 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
77 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
78 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
79 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
80
81 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
82 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
83 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
84 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
85
86 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
87 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
88 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
89 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
90
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 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
95
96 glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
97 glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
98 glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
99 glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
100
101 glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
102 glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
103 glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
104 glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
105}
106 glEnd();
107 glEndList();
108
109 wave = new GLfloat[logo.width()*logo.height()];
110 memset(wave, 0, logo.width()*logo.height());
111 startTimer(30); // wave timer
112
113 pbuffer->makeCurrent();
114 dynamicTexture = pbuffer->generateDynamicTexture();
115
116 // bind the dynamic texture to the pbuffer - this is a no-op under X11
117 hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
118}
119
120GLWidget::~GLWidget()
121{
122 delete[] wave;
123 glDeleteLists(tile_list, 1);
124 pbuffer->releaseFromDynamicTexture();
125 glDeleteTextures(1, &dynamicTexture);
126 delete pbuffer;
127}
128
129void GLWidget::paintEvent(QPaintEvent *)
130{
131 draw();
132}
133
134void GLWidget::draw()
135{
136 QPainter p(this); // used for text overlay
137
138 // save the GL state set for QPainter
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
210 // draw the overlayed text using QPainter
211 p.setPen(QColor(197, 197, 197, 157));
212 p.setBrush(QColor(197, 197, 197, 127));
213 p.drawRect(QRect(0, 0, width(), 50));
214 p.setPen(Qt::black);
215 p.setBrush(Qt::NoBrush);
216 const QString str1(tr("A simple OpenGL pbuffer example."));
217 const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."));
218 QFontMetrics fm(p.font());
219 p.drawText(width()/2 - fm.width(str1)/2, 20, str1);
220 p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2);
221}
222
223void GLWidget::mousePressEvent(QMouseEvent *e)
224{
225 anchor = e->pos();
226}
227
228void GLWidget::mouseMoveEvent(QMouseEvent *e)
229{
230 QPoint diff = e->pos() - anchor;
231 if (e->buttons() & Qt::LeftButton) {
232 rot_x += diff.y()/5.0f;
233 rot_y += diff.x()/5.0f;
234 } else if (e->buttons() & Qt::RightButton) {
235 rot_z += diff.x()/5.0f;
236 }
237
238 anchor = e->pos();
239 draw();
240}
241
242void GLWidget::wheelEvent(QWheelEvent *e)
243{
244 e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f;
245 draw();
246}
247
248void GLWidget::mouseDoubleClickEvent(QMouseEvent *)
249{
250 anim->start();
251}
252
253void GLWidget::animate(qreal val)
254{
255 rot_y = val * 180;
256 draw();
257}
258
259void GLWidget::animFinished()
260{
261 if (anim->direction() == QTimeLine::Forward)
262 anim->setDirection(QTimeLine::Backward);
263 else
264 anim->setDirection(QTimeLine::Forward);
265}
266
267void GLWidget::saveGLState()
268{
269 glPushAttrib(GL_ALL_ATTRIB_BITS);
270 glMatrixMode(GL_PROJECTION);
271 glPushMatrix();
272 glMatrixMode(GL_MODELVIEW);
273 glPushMatrix();
274}
275
276void GLWidget::restoreGLState()
277{
278 glMatrixMode(GL_PROJECTION);
279 glPopMatrix();
280 glMatrixMode(GL_MODELVIEW);
281 glPopMatrix();
282 glPopAttrib();
283}
284
285#define PI 3.14159
286
287void GLWidget::timerEvent(QTimerEvent *)
288{
289 if (QApplication::mouseButtons() != 0)
290 return;
291
292 static bool scale_in = true;
293
294 if (scale_in && scale > 35.0f)
295 scale_in = false;
296 else if (!scale_in && scale < .5f)
297 scale_in = true;
298
299 scale = scale_in ? scale + scale*0.01f : scale-scale*0.01f;
300 rot_z += 0.3f;
301 rot_x += 0.1f;
302
303 int dx, dy; // disturbance point
304 float s, v, W, t;
305 int i, j;
306 static float wt[128][128];
307 const int width = logo.width();
308 const int AMP = 5;
309
310 dx = dy = width >> 1;
311
312 W = .3f;
313 v = -4; // wave speed
314
315 for (i = 0; i < width; ++i) {
316 for ( j = 0; j < width; ++j) {
317 s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
318 wt[i][j] += 0.1f;
319 t = s / v;
320 if (s != 0)
321 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
322 else
323 wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
324 }
325 }
326}
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