VRS - The Virtual Rendering System

version 3.3

ambientocclusiongl.h

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/******************************************************************************
 * VRS - The Virtual Rendering System
 * Copyright (C) 2003 Computer Graphics Systems Group at the 
 * Hasso-Plattner-Institute (HPI), Potsdam, Germany.
 *
 * This  library  is  free  software; you can redistribute it and/or  modify it
 * under the terms of the GNU Lesser General Public  License  as  published  by
 * the  Free  Software  Foundation;  either  version 2.1 of the License, or (at
 * your option) any later version. This library  is  distributed  in  the  hope
 * that  it will be useful, but  WITHOUT ANY WARRANTY; without even the implied
 * warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE.  See  the
 * GNU Lesser General Public License for more details. You should have received
 * a copy of the GNU Lesser+ General Public License along with this library; if
 * not, write to the FreeSoftware Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA, 02111-1307, USA.
 ******************************************************************************/

// $Id: scenegraphanalyzer.h 6352 2008-05-22 19:57:33 +0000 (Do, 22 Mai 2008) Henrik_Buchholz $
// $Date: 2008-05-22 19:57:33 +0000 (Do, 22 Mai 2008) $
// $Revision: 6352 $
// $State$
// $Author: Henrik_Buchholz $
//

#ifndef VRS_OPENGL_AMBIENTOCCLUSION_H
#define VRS_OPENGL_AMBIENTOCCLUSION_H

#include <vrs/config.h>
#include <vrs/bounds.h>
#include <vrs/color.h>
#include <vrs/callback.h>
#include <vrs/uniquetexturemapping.h>

namespace VRS {
    template<typename T> class Iterator;
    class Image;
    //class ImageTexture2DGL;
    class MipmapTexture2DGL;
    class PolygonSet;
    class GLCanvas;
    
    namespace GL2 {
        class ProgramObject;
    }
}


namespace VRS {
    
    struct VRS_CORE_API AOLightingConfiguration {

        AOLightingConfiguration();

        int numSkyLightDirections;            
        VRS::Color skyColor;
        
        int numSunLightDirections;
        VRS::Vector primarySunDirection;
        double sunSize;
        double sunIntensityFactor;
        VRS::Color sunColor;

        double brightness;

        SO<VRS::Iterator<VRS::Vector> > lightDirections;
        SO<VRS::Iterator<VRS::Vector> > scaledLightColors;

        enum Preset { PS_Dawn, PS_SunnyDay, PS_Debug };
        static AOLightingConfiguration create(Preset p);
    };

    struct VRS_CORE_API AOCreationConfiguration {
        AOCreationConfiguration();

        int tiles_x, tiles_z;
    };

    class VRS_CORE_API AmbientOcclusionGL {
    public:
              
        static UniqueTextureMapping::TexturedMeshComposite createLightingTextures(
            SO<VRS::Iterator<SO<VRS::PolygonSet> > > triangles, 
            double texelPerUnit,
            SO<VRS::GLCanvas> canvas,                          
            const AOLightingConfiguration& config = AOLightingConfiguration(),
            const AOCreationConfiguration& creationConf = AOCreationConfiguration()
                );
        
        static void createLightingTexturesCallback(
            SO<VRS::Iterator<SO<VRS::PolygonSet> > > triangles, 
            double texelPerUnit,
            SO<VRS::GLCanvas> canvas, 
            SO<VRS::Callback1<UniqueTextureMapping::TexturedMeshComposite&> > storageCallback,
            const AOLightingConfiguration& config = AOLightingConfiguration(),
            const AOCreationConfiguration& creationConf = AOCreationConfiguration()
                );
        
        static UniqueTextureMapping::TexturedMeshComposite createLightingTexturesBMP(
            SO<VRS::Iterator<SO<VRS::PolygonSet> > > triangles, 
            double texelPerUnit,
            SO<VRS::GLCanvas> canvas, 
            const std::string &prefix,
            const AOLightingConfiguration& config = AOLightingConfiguration(),
            const AOCreationConfiguration& creationConf = AOCreationConfiguration()
                );
        
        static SO<VRS::Image> createLightingTexture(
            SO<VRS::PolygonSet> targetTris,
            SO<VRS::PolygonSet> environmentTriangles,
            SO<VRS::GLCanvas> canvas,
            SO<VRS::Iterator<VRS::Vector> > lightDirs,
            const AOCreationConfiguration& creationConf = AOCreationConfiguration()
        );
        

        static SO<VRS::Iterator<VRS::Vector> > createLightDirections(int num);


        static void setIDBufferSize(int size = 1024);
        static int getIDBufferSize();

        // texture cache size to speed up texture creation
        static void setMaxTextureCacheSize(int size = 200*1024*1024);
        static int getMaxTextureCacheSize();

        static void setMaxAtlasSize(int size = 1024);
        static int getMaxAtlasSize();

        static void setFBOEnabled(bool yesNo = true);
        static bool getFBOEnabled();

        static void setTextureBorderWidth(int pixels = 2);
        static int getTextureBorderWidth();

        static SO<VRS::GL2::ProgramObject> getIntensityBoostProgram(bool useTexture, float minValue = 0.0f, float maxValue = 1.5f);

    private:

        static int s_maxAtlasSize;
        static int s_maxTextureCacheSize;
        static int s_idBufferSize;
        static bool s_fboEnabled;
        static int s_textureBorderWidth;
    };

    AOLightingConfiguration defaultAOLighting();

}

#endif // LDX_UTIL_AMBIENTOCCLUSION_H

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