skybox.cpp

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/*
 * skybox.cpp
 *
 * Copyright (C) 2009  Thomas A. Vaughan
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the <organization> nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THOMAS A. VAUGHAN ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THOMAS A. VAUGHAN BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Simple wrapper to convert any model to a skybox.  In practice, "any model"
 * will in fact be a large cube with skybox textures on its faces. 
 */

// includes --------------------------------------------------------------------
#include "skybox.h"             // always include our own header first

#include "perf/perf.h"


namespace glut {




////////////////////////////////////////////////////////////////////////////////
//
//      static helper methods
//
////////////////////////////////////////////////////////////////////////////////

class Skybox : public glut::Renderable {
public:
        // constructor, destructor ---------------------------------------------
        Skybox(void) throw() { }
        ~Skybox(void) throw() { }

        // public class methods ------------------------------------------------
        void initialize(IN smart_ptr<Renderable>& model);

        // glut::Renderable class interface methods ----------------------------
        void render(IN const render_context_t& rc,
                        IN RenderQueue * rq);
        rect3d_t getBoundingBox(void) const throw() { return m_boundingBox; }

private:
        // private member data -------------------------------------------------
        smart_ptr<Renderable>           m_model;
        rect3d_t                        m_boundingBox;
};



void
Skybox::initialize
(
IN smart_ptr<Renderable>& model
)
{
        ASSERT(model, "null");

        m_model = model;

        // set bounding box to 2km on a side
        m_boundingBox.clear();
        m_boundingBox.inflate(1000);
}



void
Skybox::render
(
IN const render_context_t& rc,
IN RenderQueue * rq
)
{
        perf::Timer timer("Skybox::render");
        ASSERT(rq, "null");
        ASSERT(m_model, "null");

        // center skybox object wherever the viewer is
//      point3d_t newPos = viewer.getPosition();

        //DPRINTF("Need to translate!");

        int iOldMode;
        glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &iOldMode);
        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

        // draw!
        m_model->render(rc, rq);

        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, iOldMode);
}



////////////////////////////////////////////////////////////////////////////////
//
//      public API
//
////////////////////////////////////////////////////////////////////////////////

smart_ptr<Renderable>
createSkybox
(
IN smart_ptr<Renderable>& model
)
{
        ASSERT(model, "null");

        smart_ptr<Skybox> local = new Skybox;
        ASSERT(local, "out of memory");

        local->initialize(model);

        return local;
}



};      // glut namespace