gleimage.h

/***************************************************************************
 *   Copyright (C) 2005-2011 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE 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                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

#ifndef FIFE_VIDEO_RENDERBACKENDS_OPENGL_GLEIMAGE_H
#define FIFE_VIDEO_RENDERBACKENDS_OPENGL_GLEIMAGE_H

// Standard C++ library includes
#include <vector>

// Platform specific includes
#include "util/base/fife_stdint.h"

// 3rd party library includes
#include <SDL_video.h>

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "video/image.h"
#include "video/opengl/fife_opengl.h"

namespace FIFE {
    struct GLRenderState;

    class GLeImage : public Image {
    public:
        GLeImage(IResourceLoader* loader = 0);
        GLeImage(const std::string& name, IResourceLoader* loader = 0);
        GLeImage(SDL_Surface* surface);
        GLeImage(const std::string& name, SDL_Surface* surface);
        GLeImage(const uint8_t* data, uint32_t width, uint32_t height);
        GLeImage(const std::string& name, const uint8_t* data, uint32_t width, uint32_t height);

        virtual ~GLeImage();
        virtual void invalidate();
        virtual void setSurface(SDL_Surface* surface);
        virtual void render(const Rect& rect, uint8_t alpha = 255, uint8_t const* rgb = 0);
        virtual void renderZ(const Rect& rect, float vertexZ, uint8_t alpha = 255, bool forceNewBatch = false, uint8_t const* rgb = 0);
        virtual void useSharedImage(const ImagePtr& shared, const Rect& region);
        virtual void forceLoadInternal();
        virtual void copySubimage(uint32_t xoffset, uint32_t yoffset, const ImagePtr& img);
        virtual void load();
        virtual void free();

        GLuint getTexId() const;
        const GLfloat* getTexCoords() const;
        bool isCompressed() const { return m_compressed; }
        void setCompressed(bool compressed) { m_compressed = compressed; }
    private:
        // texture coords to use
        GLfloat m_tex_coords[4];

        // Was this image compressed by OpenGL driver during loading ?
        bool m_compressed;

        //     [0]    [2]    ->(x)
        // [1]  +------+
        //      |      |
        //      |      |
        // [3]  +------+
        //
        //      |
        //      v
        //     (y)
        // To map these indices with previous one:
        // [0]:=[1]:=0.0f, [2]:=m_col_tex_coords, [3]:=m_row_tex_coords


        GLuint m_texId;

        void cleanup();

        void resetGlimage();

        void generateGLTexture();
        void generateGLSharedTexture(const GLeImage* shared, const Rect& region);
        void validateShared();

        inline bool renderCheck(const Rect& rect, uint8_t alpha);

        uint32_t m_chunk_size_w;
        uint32_t m_chunk_size_h;

        SDL_Color m_colorkey;

        GLeImage* m_shared_img;
        // Holds Atlas ImagePtr if this is a shared image
        ImagePtr m_atlas_img;
        // Holds Atlas Name if this is a shared image
        std::string m_atlas_name;
    };

}

#endif
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