[SOLVED] clearing FrameBuffer
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Hello
i draw on a FBO with QPainter in an animation loop. The problem is i need to clear the FBO in every frame but this doesn't work. The only way to get it work is to use a background color like white, black or whatever but not with transparent.
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// slot for QVariantAnimation signal valueChanged
void updateValue(const QVariant &value) {
//QGLFramebufferObject
this->_fbo->bind();
QPainter painter(this->_fbo);
painter.setBackground(Qt::transparent);
painter.eraseRect(this->boundingRect());
painter.fillRect(0 + value.toInt(), 0, 100, 100, Qt::green);
this->_fbo->release();
this->update();
}
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The problem the FBO is not clear and so i get a large green rectangle instead of a nice moving one :) Any suggestions? -
OK, i solved the problem. The magical part is this:
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this->_fbo->bind();
glClear(GL_COLOR_BUFFER_BIT);
this->_fbo->release();
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