ScalarShaderI.h

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/*  Copyright (C) 2003-2021 Free Electron Organization
    Any use of this software requires a license.  If a valid license
    was not distributed with this file, visit freeelectron.org. */

/** @file */

#ifndef __spatial_ScalarShaderI_h__
#define __spatial_ScalarShaderI_h__

namespace fe
{
namespace ext
{

/** Shader for DrawScalarField
    */
class FE_DL_EXPORT ScalarShaderI : virtual public Component
{
    public:
virtual void    shade(Real a_value, U8 *a_pixel)                            = 0;
};

/** A simple greyscale scalar field shader
    */
class GreyShader : virtual public ScalarShaderI
{
    public:
                GreyShader(void) { }
virtual         ~GreyShader(void) { }
virtual void    shade(Real a_value, U8 *a_pixel)
        {
            a_pixel[0] = (U8)(a_value/2.0 + 50.0);
            a_pixel[1] = a_pixel[0];
            a_pixel[2] = a_pixel[0];
            a_pixel[3] = 255;
        }
};


} /* namespace ext */
} /* namespace fe */


#endif /* __spatial_ScalarShaderI_h__ */