/***********************************************************************************
 *                                                                                 *
 * Voreen - The Volume Rendering Engine                                            *
 *                                                                                 *
 * Copyright (C) 2005-2012 University of Muenster, Germany.                        *
 * Visualization and Computer Graphics Group <http://viscg.uni-muenster.de>        *
 * For a list of authors please refer to the file "CREDITS.txt".                   *
 *                                                                                 *
 * This file is part of the Voreen software package. Voreen is free software:      *
 * you can redistribute it and/or modify it under the terms of the GNU General     *
 * Public License version 2 as published by the Free Software Foundation.          *
 *                                                                                 *
 * Voreen is distributed in the hope that it will be useful, but WITHOUT ANY       *
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR   *
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.      *
 *                                                                                 *
 * You should have received a copy of the GNU General Public License in the file   *
 * "LICENSE.txt" along with this file. If not, see <http://www.gnu.org/licenses/>. *
 *                                                                                 *
 * For non-commercial academic use see the license exception specified in the file *
 * "LICENSE-academic.txt". To get information about commercial licensing please    *
 * contact the authors.                                                            *
 *                                                                                 *
 ***********************************************************************************/

#include "unaryimageprocessor.h"

#include "tgt/textureunit.h"

using tgt::TextureUnit;


namespace voreen {

UnaryImageProcessor::UnaryImageProcessor()
    : ImageProcessorBypassable("image/unary")
    , inport_(Port::INPORT, "image.inport", "Image Input")
    , outport_(Port::OUTPORT, "image.outport", "Image Output", true)
{
    addPort(inport_);
    addPort(outport_);
}

Processor* UnaryImageProcessor::create() const {
    return new UnaryImageProcessor();
}

void UnaryImageProcessor::process() {

    if (!enableSwitch_.get()){
        bypass(&inport_, &outport_);
        return;
    }

    outport_.activateTarget();

    // compile program if needed
    if (getInvalidationLevel() >= Processor::INVALID_PROGRAM)
        compile();
    LGL_ERROR;

    // initialize shader
    if (!program_ || !program_->isLinked())
        return;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    TextureUnit colorUnit, depthUnit;
    inport_.bindTextures(colorUnit.getEnum(), depthUnit.getEnum());

    program_->activate();
    setGlobalShaderParameters(program_);

    program_->setIgnoreUniformLocationError(true);
    program_->setUniform("colorTex_", colorUnit.getUnitNumber());
    program_->setUniform("depthTex_", depthUnit.getUnitNumber());
    inport_.setTextureParameters(program_, "texParams_");
    program_->setIgnoreUniformLocationError(false);

    glDepthFunc(GL_ALWAYS);
    renderQuad();
    glDepthFunc(GL_LESS);

    program_->deactivate();
    outport_.deactivateTarget();
    glActiveTexture(GL_TEXTURE0);
    LGL_ERROR;
}

} // voreen namespace
