/*

 *  The ManaPlus Client

 *  Copyright (C) 2004-2009  The Mana World Development Team

 *  Copyright (C) 2009-2010  The Mana Developers

 *  Copyright (C) 2011-2019  The ManaPlus Developers

 *  Copyright (C) 2019-2021  Andrei Karas

 *

 *  This file is part of The ManaPlus Client.

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  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 General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef RESOURCES_OPENGLIMAGEHELPER_H

#define RESOURCES_OPENGLIMAGEHELPER_H

#include "localconsts.h"

#ifdef USE_OPENGL

#ifndef GL_TEXTURE_RECTANGLE_ARB

#define GL_TEXTURE_RECTANGLE_ARB 0x84F5

#define GL_MAX_RECTANGLE_TEXTURE_SIZE_ARB 0x84F8

#endif  // GL_TEXTURE_RECTANGLE_ARB

#include "resources/imagehelper.h"

#ifdef ANDROID

#include <GLES/gl.h>

#define GL_RGBA8 GL_RGBA8_OES

#else  // ANDROID

#ifndef USE_SDL2

#define GL_GLEXT_PROTOTYPES 1

#endif  // USE_SDL2

#ifdef HAVE_GLEXT

#define NO_SDL_GLEXT

#endif  // HAVE_GLEXT

PRAGMA48(GCC diagnostic push)

PRAGMA48(GCC diagnostic ignored "-Wshadow")

// ignore -Wredundant-decls for SDL 1.2

PRAGMA45(GCC diagnostic push)

PRAGMA45(GCC diagnostic ignored "-Wredundant-decls")

#include <SDL_opengl.h>

PRAGMA45(GCC diagnostic pop)

PRAGMA48(GCC diagnostic pop)

#ifdef HAVE_GLEXT

PRAGMA45(GCC diagnostic push)

PRAGMA45(GCC diagnostic ignored "-Wredundant-decls")

#include <GL/glext.h>

PRAGMA45(GCC diagnostic pop)

#endif  // HAVE_GLEXT

#endif  // ANDROID

class Dye;

class Image;

/**

 * Defines a class for loading and storing images.

 */

class OpenGLImageHelper final : public ImageHelper

{

    friend class CompoundSprite;

    friend class Graphics;

    friend class Image;

    public:

            mFreeTextureIndex(0U),

        {

        }

        A_DELETE_COPY(OpenGLImageHelper)

        ~OpenGLImageHelper() override final;

        /**

         * Loads an image from an SDL_RWops structure and recolors it.

         *

         * @param rw         The SDL_RWops to load the image from.

         * @param dye        The dye used to recolor the image.

         *

         * @return <code>NULL</code> if an error occurred, a valid pointer

         *         otherwise.

         */

        Image *load(SDL_RWops *const rw,

                    Dye const &dye) override final A_WARN_UNUSED;

        /**

         * Loads an image from an SDL surface.

         */

        Image *loadSurface(SDL_Surface *const tmpImage) override final

                           A_WARN_UNUSED;

        Image *createTextSurface(SDL_Surface *const tmpImage,

                                 const int width, const int height,

                                 const float alpha)

                                 override final A_WARN_UNUSED;

        // OpenGL only public functions

        static int getTextureType() noexcept2 A_WARN_UNUSED

        { return mTextureType; }

        static int getInternalTextureType() noexcept2 A_WARN_UNUSED

        constexpr2 static void setInternalTextureType(const int n) noexcept2

        constexpr2 static void setBlur(const bool n) noexcept2

        static int mTextureType;

        static int mInternalTextureType;

        static int getTextureSize() noexcept2 A_WARN_UNUSED

        static void initTextureSampler(const GLint id);

        constexpr2 static void setUseTextureSampler(const bool b) noexcept2

        static void invalidate(const GLuint textureId);

        static void bindTexture(const GLuint texture);

        SDL_Surface *create32BitSurface(int width,

                                        int height) const override final;

        void postInit() override final;

        void copySurfaceToImage(const Image *const image,

                                const int x, const int y,

                                SDL_Surface *surface) const override final;

    protected:

        /**

         * Returns the first power of two equal or bigger than the input.

         */

        static int powerOfTwo(const int input) A_WARN_UNUSED;

        static SDL_Surface *convertSurfaceNormalize(SDL_Surface *tmpImage,

                                                    int width, int height);

        static SDL_Surface *convertSurface(SDL_Surface *tmpImage,

                                           int width, int height);

        Image *glLoad(SDL_Surface *tmpImage,

                      int width = 0, int height = 0) A_WARN_UNUSED;

        GLuint getNewTexture();

        static const size_t texturesSize = 10;

        size_t mFreeTextureIndex;

        GLuint mTextures[texturesSize];

        static int mTextureSize;

        static bool mBlur;

        static bool mUseTextureSampler;

};

#endif  // USE_OPENGL

#endif  // RESOURCES_OPENGLIMAGEHELPER_H