/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
 *    retain the above copyright notice,        ]E.pYY(Q]>.   a     J@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
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 * 2. Redistributions in binary form must        )_]X{Z('a_"a7'<a"a,  ]"[
 *    reproduce the above copyright notice,       #}<]m7`Za??4,P-"'7. ).m
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 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
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 *    from this software without specific        (js, \[QQW$QWW#?!V"".
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 *                                                 -]n w/ '         [.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef GCN_OPENGLIMAGE_HPP
#define GCN_OPENGLIMAGE_HPP

#if defined (_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#if defined (DELETE)
#undef DELETE
#endif
#endif

#if defined (__APPLE__)
#include <OpenGL/gl.h>
#else
#include <SDL_opengl.h>
#endif

#include <string>

#include "guisan/color.hpp"
#include "guisan/platform.hpp"
#include "guisan/image.hpp"

namespace gcn
{
	/**
	 * OpenGL implementation of Image.
	 */
	class GCN_EXTENSION_DECLSPEC OpenGLImage : public Image
	{
	public:
		/**
		 * Constructor. Loads an image from an array of pixels. The pixel array is
		 * is copied in the constructor and should thus be freed after the constructor
		 * has been called.
		 *
		 * NOTE: The functions getPixel and putPixel are only guaranteed to work
		 *       before an image has been converted to display format.
		 *
		 * @param pixels to load from.
		 * @param width the width of the image.
		 * @param height the height of the image.
		 * @param convertToDisplayFormat true if the image should be converted
		 *                               to display, false otherwise.
		 */
		OpenGLImage(unsigned int* pixels, int width, int height, bool convertToDisplayFormat = true);

		/**
		 * Constructor. Load an image from an OpenGL texture handle. The width
		 * and height specifies the size of the "interesting" part of the
		 * texture, the real width and height of the texture are assumed to
		 * be the closest higher power of two.
		 *
		 * @param textureHandle the texture handle from which to load.
		 * @param width the width of the image.
		 * @param height the height of the image.
		 * @param autoFree true if the surface should automatically be deleted.
		 */
		OpenGLImage(GLuint textureHandle, int width, int height, bool autoFree);

		/**
		 * Destructor.
		 */
		virtual ~OpenGLImage();

		/**
		 * Gets the OpenGL texture handle for the image.
		 *
		 * @return the OpenGL texture handle for the image.
		 */

		[[nodiscard]] virtual GLuint getTextureHandle() const;

		/**
		 * Gets the width of texture.
		 *
		 * @return the width of the texture.
		 */
		[[nodiscard]] virtual int getTextureWidth() const;

		/**
		 * Gets the height of the texture.
		 *
		 * @return the height of the texture.
		 */
		[[nodiscard]] virtual int getTextureHeight() const;


		// Inherited from Image

		void free() override;

		[[nodiscard]] int getWidth() const override;

		[[nodiscard]] int getHeight() const override;

		Color getPixel(int x, int y) override;

		void putPixel(int x, int y, const Color& color) override;

		void convertToDisplayFormat() override;

	protected:
		GLuint mTextureHandle;
		unsigned int* mPixels;
		bool mAutoFree;
		int mWidth;
		int mHeight;
		int mTextureWidth;
		int mTextureHeight;
	};
}

#endif // end GCN_OPENGLIMAGE_HPP