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processordecoratorshading.cpp 6.29 KB
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// ================================================================================================
// 
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// This file is part of the CAMPVis Software Framework.
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// 
// If not explicitly stated otherwise: Copyright (C) 2012, all rights reserved,
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//      Christian Schulte zu Berge <christian.szb@in.tum.de>
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//      Chair for Computer Aided Medical Procedures
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//      Technische Universität München
//      Boltzmannstr. 3, 85748 Garching b. München, Germany
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// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
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// 
// The licensing of this softare is not yet resolved. Until then, redistribution in source or
// binary forms outside the CAMP chair is not permitted, unless explicitly stated in legal form.
// However, the names of the original authors and the above copyright notice must retain in its
// original state in any case.
// 
// Legal disclaimer provided by the BSD license:
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// 
// ================================================================================================

#include "processordecoratorshading.h"

#include "tgt/shadermanager.h"
#include "core/properties/propertycollection.h"

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namespace campvis {
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    static const GenericOption<ProcessorDecoratorShading::GradientMethod> gradientOptions[4] = {
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        GenericOption<ProcessorDecoratorShading::GradientMethod>("Forward", "Forward Differences", ProcessorDecoratorShading::ForwardDifferences),
        GenericOption<ProcessorDecoratorShading::GradientMethod>("Central", "Central Differences", ProcessorDecoratorShading::CentralDifferences),
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        GenericOption<ProcessorDecoratorShading::GradientMethod>("Sobel", "Sobel Filter", ProcessorDecoratorShading::SobelFilter),
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        GenericOption<ProcessorDecoratorShading::GradientMethod>("FilteredCentral", "Filtered Central Differences", ProcessorDecoratorShading::FilteredCentralDifferences)
    };
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    ProcessorDecoratorShading::ProcessorDecoratorShading(const std::string& lightUniformName /*= "_lightSource"*/)
        : AbstractProcessorDecorator()
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        , _enableShading("EnableShading", "Enable Shading", true, AbstractProcessor::INVALID_SHADER | AbstractProcessor::INVALID_RESULT)
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        , _gradientMethod("GradientMethod", "Gradient Computation Method", gradientOptions, 4, AbstractProcessor::INVALID_SHADER | AbstractProcessor::INVALID_RESULT)
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        , _lightPosition("LightPosition", "Light Position", tgt::vec3(-100.f), tgt::vec3(-500.f), tgt::vec3(500.f), tgt::vec3(1.f))
        , _ambientColor("AmbientColor", "Ambient Light Color", tgt::vec3(0.4f), tgt::vec3(0.f), tgt::vec3(1.f))
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        , _diffuseColor("DiffuseColor", "Diffuse Light Color", tgt::vec3(0.75f), tgt::vec3(0.f), tgt::vec3(1.f))
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        , _specularColor("SpecularColor", "Specular Light Color", tgt::vec3(0.6f), tgt::vec3(0.f), tgt::vec3(1.f))
        , _shininess("Shininess", "Specular Shininess", 24.f, 0.f, 64.f, 0.5f)
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        , _attenuation("Attenuation", "Attenuation Factors", tgt::vec3(0.f), tgt::vec3(0.f), tgt::vec3(1.f))
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        , _lightUniformName(lightUniformName)
    {
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        _gradientMethod.setValue(1);
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    }

    ProcessorDecoratorShading::~ProcessorDecoratorShading() {
    }

    void ProcessorDecoratorShading::addProperties(HasPropertyCollection* propCollection) {
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        propCollection->addProperty(&_enableShading);
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        propCollection->addProperty(&_gradientMethod);
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        propCollection->addProperty(&_lightPosition);
        propCollection->addProperty(&_ambientColor);
        propCollection->addProperty(&_diffuseColor);
        propCollection->addProperty(&_specularColor);
        propCollection->addProperty(&_shininess);
        propCollection->addProperty(&_attenuation);
    }

    void ProcessorDecoratorShading::renderProlog(const DataContainer& dataContainer, tgt::Shader* shader) {
        shader->setUniform(_lightUniformName + "._position", _lightPosition.getValue());
        shader->setUniform(_lightUniformName + "._ambientColor", _ambientColor.getValue());
        shader->setUniform(_lightUniformName + "._diffuseColor", _diffuseColor.getValue());
        shader->setUniform(_lightUniformName + "._specularColor", _specularColor.getValue());
        shader->setUniform(_lightUniformName + "._shininess", _shininess.getValue());
        shader->setUniform(_lightUniformName + "._attenuation", _attenuation.getValue());
    }


    std::string ProcessorDecoratorShading::generateHeader() const {
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        std::string toReturn;
        if (_enableShading.getValue())
            toReturn.append("#define ENABLE_SHADING\n");
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        switch (_gradientMethod.getOptionValue()) {
            case ForwardDifferences :
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                toReturn.append("#define computeGradient(tex, texParams, texCoords) computeGradientForwardDifferences(tex, texParams, texCoords)\n");
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                break;
            case CentralDifferences :
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                toReturn.append("#define computeGradient(tex, texParams, texCoords) computeGradientCentralDifferences(tex, texParams, texCoords)\n");
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                break;
            case FilteredCentralDifferences :
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                toReturn.append("#define computeGradient(tex, texParams, texCoords) computeGradientFilteredCentralDifferences(tex, texParams, texCoords)\n");
                break;
            case SobelFilter :
                toReturn.append("#define computeGradient(tex, texParams, texCoords) computeGradientSobel(tex, texCoords)\n");
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                break;
            default:
                tgtAssert(false, "Invalid enum!");
                break;
        }
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        return toReturn;
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    }

}