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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2010 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTH_TEXTURE_COMPOSITOR_MULTI_TEXTURE_H
#define OSGEARTH_TEXTURE_COMPOSITOR_MULTI_TEXTURE_H 1

#include <osgEarth/TextureCompositor>

namespace osgEarth
{
    class TextureCompositorMultiTexture : public TextureCompositorTechnique
    {
    public:
        TextureCompositorMultiTexture( bool useGPU, const TerrainOptions& options );

        bool requiresUnitTextureSpace() const { return false; }

        bool usesShaderComposition() const { return _useGPU; }

        bool blendingRequiresSecondarySlot() const { return true; }

        void updateMasterStateSet( osg::StateSet* stateSet, const TextureLayout& layout ) const;

        bool supportsLayerUpdate() const { return true; }

        void applyLayerUpdate( 
            osg::StateSet* stateSet, UID layerUID,
            const GeoImage& preparedImage, const TileKey& tileExtent,
            const TextureLayout& layout, osg::StateSet* parentStateSet) const;

        osg::Shader* createSamplerFunction(
            UID layerUID, 
            const std::string& functionName,
            osg::Shader::Type type,
            const TextureLayout& layout ) const;

    private:
        float _lodTransitionTime;
        bool _useGPU;
        bool _enableMipmappingOnUpdatedTextures;
        bool _enableMipmapping;
    };
}

#endif // OSGEARTH_TEXTURE_COMPOSITOR_MULTI_TEXTURE_H