CLight.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
#pragma once

#include <mrpt/typemeta/TTypeName.h>
#include <mrpt/serialization/serialization_frwds.h>
namespace mrpt::opengl
{
/** Each of the possible lights of a 3D scene \sa COpenGLViewport
 * *IMPORTANT NOTE*: It's the user responsibility to define unique light IDs
 * for each light.
 *  The OpenGL standard only assures that valid IDs are 0,1,..7
 * Refer to standard OpenGL literature and tutorials for the meaning of each
 * field.
 */
struct CLight
{
    /** Default constructor, sets default values */
    CLight();

    void setPosition(float x, float y, float z, float w);
    void setDirection(float dx, float dy, float dz);

    /** OpenGL ID (typical range: 0-7) */
    uint8_t light_ID;

    float color_ambient[4];
    float color_diffuse[4];
    float color_specular[4];

    /** [x,y,z,w]: w=0 means directional light, w=1 means a light at a real 3D
     * position. */
    float position[4];
    /** [x,y,z] */
    float direction[3];
    float constant_attenuation;
    float linear_attenuation;
    float quadratic_attenuation;
    float spot_exponent;
    float spot_cutoff;

    void writeToStream(mrpt::serialization::CArchive& out) const;
    void readFromStream(mrpt::serialization::CArchive& in);

    /** Define the light in the current OpenGL rendering context (users normally
     * don't need to call this explicitly, it's done from within a \sa
     * COpenGLViewport) */
    void sendToOpenGL() const;

    DECLARE_TTYPENAME_CLASSNAME(mrpt::opengl::CLight)
};

mrpt::serialization::CArchive& operator>>(
    mrpt::serialization::CArchive& in, mrpt::opengl::CLight& o);
mrpt::serialization::CArchive& operator<<(
    mrpt::serialization::CArchive& out, const mrpt::opengl::CLight& o);

}