Method initializeGL

Gui/Histogram.cpp:687–826

}

void
Histogram::initializeGL()
{
    // always running in the main thread
    assert( qApp && qApp->thread() == QThread::currentThread() );
    appPTR->initializeOpenGLFunctionsOnce();

    if ( !appPTR->isOpenGLLoaded() ) {
        return;
    }

    assert( QOpenGLContext::currentContext() == context() );


#ifdef NATRON_HISTOGRAM_USING_OPENGL
    _imp->histogramComputingShader.reset( new QOpenGLShaderProgram( context() ) );
    if ( !_imp->histogramComputingShader->addShaderFromSourceCode(QOpenGLShader::Vertex, histogramComputationVertex_vert) ) {
        qDebug() << _imp->histogramComputingShader->log();
    }
    if ( !_imp->histogramComputingShader->addShaderFromSourceCode(QOpenGLShader::Fragment, histogramComputation_frag) ) {
        qDebug() << _imp->histogramComputingShader->log();
    }
    if ( !_imp->histogramComputingShader->link() ) {
        qDebug() << _imp->histogramComputingShader->log();
    }

    _imp->histogramMaximumShader.reset( new QOpenGLShaderProgram( context() ) );
    if ( !_imp->histogramMaximumShader->addShaderFromSourceCode(QOpenGLShader::Fragment, histogramMaximum_frag) ) {
        qDebug() << _imp->histogramMaximumShader->log();
    }
    if ( !_imp->histogramMaximumShader->link() ) {
        qDebug() << _imp->histogramMaximumShader->log();
    }

    _imp->histogramRenderingShader.reset( new QOpenGLShaderProgram( context() ) );
    if ( !_imp->histogramRenderingShader->addShaderFromSourceCode(QOpenGLShader::Vertex, histogramRenderingVertex_vert) ) {
        qDebug() << _imp->histogramRenderingShader->log();
    }
    if ( !_imp->histogramRenderingShader->addShaderFromSourceCode(QOpenGLShader::Fragment, histogramRendering_frag) ) {
        qDebug() << _imp->histogramRenderingShader->log();
    }
    if ( !_imp->histogramRenderingShader->link() ) {
        qDebug() << _imp->histogramRenderingShader->log();
    }

    // enable globally : no glPushAttrib()
    glEnable(GL_TEXTURE_RECTANGLE_ARB);


    glGenTextures(3, &_imp->histogramTexture[0]);
    glGenTextures(3, &_imp->histogramReductionsTexture[0]);
    glGenTextures(3, &_imp->histogramRenderTexture[0]);
    glGenTextures(3, &_imp->histogramMaximumTexture[0]);

    _imp->leftImageTexture.reset( new Texture(GL_TEXTURE_RECTANGLE_ARB, GL_NEAREST, GL_NEAREST) );
    _imp->rightImageTexture.reset( new Texture(GL_TEXTURE_RECTANGLE_ARB, GL_NEAREST, GL_NEAREST) );

    glGenFramebuffers(3, &_imp->fboReductions[0]);