color_conv.hpp

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/*

PICCANTE
The hottest HDR imaging library!
http://vcg.isti.cnr.it/piccante

Copyright (C) 2014
Visual Computing Laboratory - ISTI CNR
http://vcg.isti.cnr.it
First author: Francesco Banterle

This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.

*/

#ifndef PIC_GL_COLORS_COLOR_CONV_HPP
#define PIC_GL_COLORS_COLOR_CONV_HPP

#include <string>

#include "../../util/gl/technique.hpp"

namespace pic {

class ColorConvGL
{
protected:
    int direct;
    TechniqueGL techniques[2];

public:

    ColorConvGL(bool direct = true)
    {
        setTransform(direct);
    }

    virtual std::string getDirectFunction() = 0;

    virtual std::string getDirectFunctionAux() = 0;

    virtual std::string getDirectUniforms() = 0;

    virtual std::string getInverseFunction() = 0;

    virtual std::string getInverseUniforms() = 0;

    virtual std::string getInverseFunctionAux() = 0;

    void generatePrograms(std::string vertex_source)
    {
        //direct transform
        techniques[0].initStandard("330", vertex_source, getDirectFunction(), "ColorConv (direct)");

        techniques[0].bind();
        techniques[0].setUniform1i("u_tex", 0);
        techniques[0].unbind();

        //inverse transform
        techniques[1].initStandard("330", vertex_source, getInverseFunction(), "ColorConv (inverse)");

        techniques[1].bind();
        techniques[1].setUniform1i("u_tex", 0);
        techniques[1].unbind();
    }

    void setTransform(bool direct)
    {
        this->direct = direct ? 0 : 1;
    }

    void bindProgram()
    {
        techniques[direct].bind();
    }

    void unbindProgram()
    {
        techniques[direct].unbind();
    }
    
    virtual void setUniforms()
    {        
    }
};

} // end namespace pic

#endif /* PIC_GL_COLORS_COLOR_CONV_HPP */