ViewOpenGL.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 __opengl_ViewOpenGL_h__
#define __opengl_ViewOpenGL_h__

namespace fe
{
namespace ext
{

/**************************************************************************//**
    @brief OpenGL-specific implementations for ViewI

    @ingroup opengl
*//***************************************************************************/
class FE_DL_EXPORT ViewOpenGL: virtual public ViewCommon
{
    public:
                        ViewOpenGL();

                        //* as ViewI
virtual void            use(ViewI::Projection a_projection);

virtual Real            pixelSize(const SpatialVector& center,
                                Real radius) const;
virtual Real            worldSize(const SpatialVector& center,
                                Real pixels) const;

virtual SpatialVector   unproject(Real winx,Real winy,Real winz,
                                ViewI::Projection a_projection) const;
virtual SpatialVector   project(const SpatialVector& point,
                                ViewI::Projection a_projection) const;

virtual void            setScissor(const Box2i* a_pBox);
virtual const Box2i*    scissor(void) const;

    private:
        bool            currentContextIsSet(void);

        void            useOrtho(void);
        void            usePerspective(void);
        void            prepare(ViewI::Projection a_projection,
                                GLdouble* model16,
                                GLdouble* proj16,GLint* view) const;

        BWORD           m_scissoring;
        Box2i           m_scissor;
};

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

#endif /* __opengl_ViewOpenGL_h__ */