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385
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1 #include "edview.h"
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2
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3
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4 DemoView::DemoView(QWidget *parent)
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5 : QGLWidget(QGLFormat(QGL::SampleBuffers|QGL::AlphaChannel), parent)
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6 {
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7 makeCurrent();
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8
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9 if (QGLFramebufferObject::hasOpenGLFramebufferBlit())
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10 {
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11 QGLFramebufferObjectFormat format;
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12 format.setSamples(4);
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13 format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
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14
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15 render_fbo = new QGLFramebufferObject(512, 512, format);
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16 texture_fbo = new QGLFramebufferObject(512, 512);
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17 }
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18 else
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19 {
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20 render_fbo = new QGLFramebufferObject(1024, 1024);
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21 texture_fbo = render_fbo;
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22 }
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23 }
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24
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25 DemoView::~DemoView()
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26 {
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27 delete texture_fbo;
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28 if (render_fbo != texture_fbo)
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29 delete render_fbo;
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30 }
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31
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32
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33 void DemoView::paintEvent(QPaintEvent *)
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34 {
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35 draw();
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36 }
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37
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38
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39 void DemoView::draw()
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40 {
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41 QPainter p(this); // used for text overlay
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42
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43 // save the GL state set for QPainter
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44 saveGLState();
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45
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46 // restore the GL state that QPainter expects
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47 restoreGLState();
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48 }
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49
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50
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51 void DemoView::saveGLState()
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52 {
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53 glPushAttrib(GL_ALL_ATTRIB_BITS);
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54 glMatrixMode(GL_PROJECTION);
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55 glPushMatrix();
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56 glMatrixMode(GL_MODELVIEW);
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57 glPushMatrix();
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58 }
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59
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60
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61 void DemoView::restoreGLState()
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62 {
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63 glMatrixMode(GL_PROJECTION);
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64 glPopMatrix();
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65 glMatrixMode(GL_MODELVIEW);
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66 glPopMatrix();
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67 glPopAttrib();
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68 }
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