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POC++/Qt, OpenGL texture mapping
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  1. POC++/Qt, OpenGL texture mapping
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    copied!<p>I'm attempting to render a texture that has been mapped to the graphics video memory. I have used qDebug to test that input of my image, indeed it possesses a 512x512 image which is a power of 2. Yet still when I attempt to render, instead of a texture the result is merely a quad which is white.</p> <p>To note: GLuint m_textureIdents[1]; is correctly defined in GLWidget.h</p> <pre><code>#include "GLWidget.h" GLWidget::GLWidget(QWidget *parent) : QGLWidget(parent) { setMouseTracking(true); m_sceneIndex = SinQuest::SplashScreen; } void GLWidget::setApplicationPath(QString strAppPath) { m_strAppPath = strAppPath; } #include &lt;QDebug&gt; void GLWidget::loadResources(void) { m_imageHandler.addImage(QString(m_strAppPath).append(QDir().toNativeSeparators("\\resources\\images\\")).append("splash_logo.png"), "splash-logo"); QImage glImageData = QGLWidget::convertToGLFormat(*m_imageHandler.getImage("splash-logo")); qDebug() &lt;&lt; glImageData.width() &lt;&lt; ":" &lt;&lt; glImageData.height(); m_textureIdents[0] = 0; glGenTextures(1, &amp;m_textureIdents[0]); glBindTexture(GL_TEXTURE_2D, m_textureIdents[0]); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, glImageData.width(), glImageData.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, glImageData.bits()); } void GLWidget::initializeGL() { glEnable(GL_TEXTURE_2D); glDisable(GL_DEPTH_TEST); glDisable(GL_COLOR_MATERIAL); glEnable(GL_BLEND); glEnable(GL_POLYGON_SMOOTH); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glClearColor(0, 0, 0, 0); } void GLWidget::resizeGL(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, w, 0, h, -1.0l, 1.0l); // set up origin glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void GLWidget::paintGL() { glClearColor( 0.0f, 0.0f, 0.0f, 0.0f); glClear( GL_COLOR_BUFFER_BIT ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glColor3f(1.0f, 1.0f, 1.0f); glShadeModel( GL_FLAT ); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, m_textureIdents[0]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex2i(0, 0); glTexCoord2f(1.0f, 0.0f); glVertex2i(512, 0); glTexCoord2f(1.0f, 1.0f); glVertex2i(512, 512); glTexCoord2f(0.0f, 1.0f); glVertex2i(0, 512); glEnd(); } void GLWidget::mousePressEvent(QMouseEvent *event) { } void GLWidget::mouseMoveEvent(QMouseEvent *event) { printf("%d, %d\n", event-&gt;x(), event-&gt;y()); } void GLWidget::keyPressEvent(QKeyEvent* event) { switch(event-&gt;key()) { case Qt::Key_Escape: close(); break; default: event-&gt;ignore(); break; } } </code></pre> <p>...</p> <pre><code>int main(int argc, char *argv[]) { QApplication app(argc, argv); QDesktopWidget *pDeskWidget = app.desktop(); // available geometry to obtain resolution for primary screen QRect avGeometry = pDeskWidget-&gt;availableGeometry(pDeskWidget-&gt;primaryScreen()); // create window, set resolution and invoke fullscreen window state GLWidget window; window.setApplicationPath(QCoreApplication::applicationDirPath()); window.loadResources(); window.resize(avGeometry.width(), avGeometry.height()); window.setWindowState(Qt::WindowFullScreen); window.show(); return app.exec(); } </code></pre>
 

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