source: trunk/nv/interface/camera.hh @ 451

// Copyright (C) 2014-2015 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

/**
 * @file camera.hh
 * @author Kornel Kisielewicz epyon@chaosforge.org
 * @brief Camera interface class
 */

#ifndef NV_INTERFACE_CAMERA_HH
#define NV_INTERFACE_CAMERA_HH

#include <nv/common.hh>
#include <nv/stl/math.hh>

namespace nv
{
        class camera
        {
        public:
                camera() {}

                void set_lookat( const vec3& eye, const vec3& focus, const vec3& up )
                {
                        m_view      = math::look_at( eye, focus, up );
                        m_position  = eye;
                        m_direction = glm::normalize( focus - eye );
                }

                void set_perspective( f32 fov, f32 aspect, f32 near, f32 far )
                {
                        m_projection = math::perspective( glm::radians( fov ), aspect, near, far );
                }
                void set_ortho( f32 left, f32 right, f32 bottom, f32 top, f32 near = -1.0f, f32 far = 1.0f )
                {
                        m_projection = math::ortho( left, right, bottom, top, near, far );
                }
                const mat4& get_projection() const 
                {
                        return m_projection;
                }
                const mat4& get_view() const 
                {
                        return m_view;
                }
                const vec3& get_position() const
                {
                        return m_position;
                }
                const vec3& get_direction() const
                {
                        return m_direction;
                }
        private:
                bool m_dirty;
                vec3 m_position;
                vec3 m_direction;
                mat4 m_projection;
                mat4 m_view;
        };

        // TODO - this and camera should have dirty states
        class scene_state
        {
        public:
                const camera& get_camera() const   { return m_camera; }
                camera& get_camera()               { return m_camera; }
                void set_camera( const camera& c ) { m_camera = c; }
                void set_model( const mat4& m )    { m_model  = m; } 
                void set_viewport( const ivec4& v ){ m_viewport = v; }
                const ivec4& get_viewport()  const { return m_viewport; }
                const mat4& get_model()      const { return m_model; }
                const mat4& get_view()       const { return m_camera.get_view(); }
                const mat4& get_projection() const { return m_camera.get_projection(); }
                mat4 get_modelview()  const { return get_view() * m_model; }
                mat4 get_mvp()        const { return m_camera.get_projection() * get_modelview(); }

                mat4 get_view_inv()   const { return glm::inverse( get_view() ); }
                mat4 get_model_inv()  const { return glm::inverse( get_model() ); }
                mat3 get_normal()     const { return glm::transpose(glm::inverse( mat3( get_modelview() ) ) ); }
        protected:
                mat4   m_model;
                camera m_camera; 
                ivec4  m_viewport;
        };


}

#endif // NV_INTERFACE_CAMERA_HH