orennayar.hpp

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#ifndef __ORENNAYAR__
#define __ORENNAYAR__

#include <tucano/effect.hpp>
#include <tucano/camera.hpp>

namespace Tucano
{

namespace Effects
{

class OrenNayar : public Tucano::Effect
{

private:

    Tucano::Shader orennayar_shader;

    float roughness = 1.0;

public:

    OrenNayar (void) {}

    virtual void initialize (void)
    {
        loadShader(orennayar_shader, "orennayar") ;
    }

    float getRoughnessCoeff (void)
    {
        return roughness;
    }


    void setRoughnessCoeff (float value)
    {
        roughness = value;
    }

    void render (Tucano::Mesh& mesh, const Tucano::Camera& camera, const Tucano::Camera& light)
    {

        Eigen::Vector4f viewport = camera.getViewport();
        glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);

        orennayar_shader.bind();

        // sets all uniform variables for the Oren-Nayar shader
        orennayar_shader.setUniform("projectionMatrix", camera.getProjectionMatrix());
        orennayar_shader.setUniform("modelMatrix", mesh.getModelMatrix());
        orennayar_shader.setUniform("viewMatrix", camera.getViewMatrix());
        orennayar_shader.setUniform("lightViewMatrix", light.getViewMatrix());
        orennayar_shader.setUniform("has_color", mesh.hasAttribute("in_Color"));
                orennayar_shader.setUniform("default_color", mesh.getColor());
        orennayar_shader.setUniform("sigma", roughness);

        mesh.setAttributeLocation(orennayar_shader);

        mesh.render();

        orennayar_shader.unbind();
    }

};
}

}

#endif