texture.h

/* Copyright (c) 2009, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *  
 * 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 Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQ_TEXTURE_H
#define EQ_TEXTURE_H

#include <eq/client/windowSystem.h> // GL types
#include <eq/client/frame.h>        // Frame::Buffer enum

#include <eq/base/thread.h>         // thread debug macro
#include <eq/base/nonCopyable.h>    // base class

namespace eq
{
    class Image;
    class PixelViewport;

    class Texture : public base::NonCopyable
    {
    public:
        Texture( GLEWContext* const glewContext = 0 );
        ~Texture();

        void flush();

        void setFormat( const GLuint format );

        GLuint getFormat() const { return _internalFormat; }

        void copyFromFrameBuffer( const PixelViewport& pvp );

        void upload( const Image* image, const Frame::Buffer which );

        void download( void* buffer, const uint32_t format, 
                       const uint32_t type ) const;

        void download( void* buffer ) const;

        void bind() const
            { EQASSERT( _id ); glBindTexture( GL_TEXTURE_RECTANGLE_ARB, _id ); }

        void bindToFBO( const GLenum target, const int width, const int height);

        void resize( const int width, const int height );

        bool isValid() const;

        GLEWContext* glewGetContext() { return _glewContext; }
        const GLEWContext* glewGetContext() const { return _glewContext; }

    private:
        GLuint _id;

        GLuint _internalFormat;

        GLuint _format;

        GLuint _type;

        int32_t _width;

        int32_t _height;

        bool _defined;

        GLEWContext* const _glewContext;

        union // placeholder for binary-compatible changes
        {
            char dummy[64];
        };

        void _generate();

        void _resize( const int32_t width, const int32_t height );

        CHECK_THREAD_DECLARE( _thread );
    };
};
#endif // EQ_TEXTURE_H