/***********************************************************************************
 *                                                                                 *
 * 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 "colordepth.h"

#include "tgt/texturemanager.h"
#include "tgt/textureunit.h"

using tgt::TextureUnit;

namespace voreen {

const std::string ColorDepth::loggerCat_("voreen.base.ColorDepth");

ColorDepth::ColorDepth()
    : ImageProcessorBypassable("image/colordepth")
    , chromaDepthTex_(0)
    , colorMode_("mode", "Choose mode", INVALID_PROGRAM)
    , factor_("factor", "Factor", 1.0f, 0.0f, 10.0f)
    , inport_(Port::INPORT, "image.inport", "Image Input")
    , outport_(Port::OUTPORT, "image.outport", "Image Output")
{
    colorMode_.addOption("light-dark-replace", "Light-dark (replace)", 0);
    colorMode_.addOption("light-dark-modulate", "Light-dark (modulate)", 1);
    colorMode_.addOption("chromadepth", "Chromadepth", 2);
    colorMode_.addOption("pseudo-chromadepth", "Pseudo chromadepth", 3);
    addProperty(colorMode_);

    addProperty(factor_);

    addPort(inport_);
    addPort(outport_);
}

ColorDepth::~ColorDepth() {
    if (chromaDepthTex_)
        TexMgr.dispose(chromaDepthTex_);
}

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

void ColorDepth::initialize() throw (tgt::Exception) {
    ImageProcessorBypassable::initialize();

    std::string texturePath = VoreenApplication::app()->getResourcePath("transferfuncs/chromadepthspectrum.bmp");
    if (TexMgr.completePath(texturePath) == "")
        throw VoreenException("Texture file not found: " + texturePath);
    chromaDepthTex_ = TexMgr.load(texturePath);
    if (!chromaDepthTex_)
        throw VoreenException("Unable to load texture file: " + texturePath);
}

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

    if (!chromaDepthTex_) {
        LERROR("No chroma depth texture");
        return;
    }

    //compute Depth Range
    tgt::vec2 depthRange = computeDepthRange(&inport_);

    outport_.activateTarget();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

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

    // bind chroma depth texture
    TextureUnit chromaDepthUnit;
    chromaDepthUnit.activate();
    //chromaDepthTex_ is 0 here
    chromaDepthTex_->bind();
    LGL_ERROR;

    // initialize shader
    program_->activate();
    setGlobalShaderParameters(program_);
    program_->setUniform("colorTex_", colorUnit.getUnitNumber());
    program_->setUniform("depthTex_", depthUnit.getUnitNumber());
    inport_.setTextureParameters(program_, "texParams_");
    program_->setUniform("chromadepthTex_", chromaDepthUnit.getUnitNumber());
    program_->setUniform("minDepth_", depthRange.x);
    program_->setUniform("maxDepth_", depthRange.y);
    program_->setUniform("colorMode_", colorMode_.getValue());
    program_->setUniform("colorDepthFactor_", factor_.get());

    renderQuad();

    program_->deactivate();
    TextureUnit::setZeroUnit();
    outport_.deactivateTarget();
    LGL_ERROR;
}

} // voreen namespace
