--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/engine/core/video/opengl/glimage.h	Sun Jun 29 18:44:17 2008 +0000
@@ -0,0 +1,124 @@
+/***************************************************************************
+ *   Copyright (C) 2005-2008 by the FIFE team                              *
+ *   http://www.fifengine.de                                               *
+ *   This file is part of FIFE.                                            *
+ *                                                                         *
+ *   FIFE 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     *
+ *   (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 General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA              *
+ ***************************************************************************/
+
+#ifndef FIFE_VIDEO_RENDERBACKENDS_OPENGL_GLIMAGE_H
+#define FIFE_VIDEO_RENDERBACKENDS_OPENGL_GLIMAGE_H
+
+// Standard C++ library includes
+#include <vector>
+
+// Platform specific includes
+#include "util/base/fife_stdint.h"
+
+// 3rd party library includes
+
+// 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 "fife_opengl.h"
+
+namespace FIFE {
+	// FIXME: due to image chunking issues, GLImage uses SDLImage to draw primitives on its surface
+	// remember though that OpenGL backend is not separate thing of SDL; instead it sits on top of it
+	class SDLImage;
+
+
+	/** Implements an Image using OpenGL.
+	 *
+	 * This class contains a texture handle bound to the data given to the constructor;
+	 * it draws a textured @i Quad to the screen.
+	 *
+	 * @see Image
+	 * @note Width and height are not limited to powers of two; non-power of two
+	 * images will be converted internally.
+	 * @todo Check the correctness of the generateTexture function on big endian systems (ppc)
+	 */
+	class GLImage : public Image {
+	public:
+		GLImage(SDL_Surface* surface);
+		GLImage(const uint8_t* data, unsigned int width, unsigned int height);
+		virtual ~GLImage();
+		void render(const Rect& rect, SDL_Surface* dst, unsigned char alpha = 255);
+		void saveImage(const std::string& filename);
+ 		bool putPixel(int x, int y, int r, int g, int b);
+		void drawLine(const Point& p1, const Point& p2, int r, int g, int b);
+		void drawQuad(const Point& p1, const Point& p2, const Point& p3, const Point& p4,  int r, int g, int b);
+
+	protected:
+		void setClipArea(const Rect& cliparea, bool clear);
+
+	private:
+		// number of rows into which this image is sliced, so that it "becomes power of 2 compatible"
+		unsigned int m_rows;
+		// see m_rows
+		unsigned int m_cols;
+
+		// ratio of texture fill in last column. E.g. in case image width = 300, chunk = 256x256,
+		// last column chunk width = 64 -> ratio is (300-256) / 64 = 0.6875
+		// this means that texture fills 68.75% the last column
+		float m_last_col_fill_ratio;
+		// @see m_last_col_fill_ratio
+		float m_last_row_fill_ratio;
+
+		/** the width of last column to render. This is also power of two 
+		 * (e.g. if chunks are 256x256 and image width = 300, last column = 64
+		 */
+		unsigned int m_last_col_width;
+		// see m_last_col_width 
+		unsigned int m_last_row_height;
+
+		/** Holds texture ids that are used to access textures in GL rendering context
+		 */
+		GLuint* m_textureids;
+
+		/** Frees allocated memory and calls resetGlImage
+		 */
+		void cleanup();
+		
+		/** Resets GLImage variables
+		 */
+		void resetGlimage();
+		
+		//void saveAsPng(const std::string& filename, SDL_Surface& surface);
+
+		/** Generates chunks for render. For reference, see
+		 * http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/chapter_10_section_4.html
+		 */
+		void generateTextureChunks();
+		
+		/** Original SDLImage where GLImage is created from
+		 * FIXME: at the moment SDLImage is used to draw graphics (e.g. line) on screen
+		 * this is clearly not optimal, but image chunking makes somewhat harder to do
+		 * proper drawing of graphics (e.g. how to segment lines into correct boxes).
+		 * It might be possible to use some kind of offscreen OpenGL image for this
+		 * purpose
+		 */
+		SDLImage* m_sdlimage;
+		
+		unsigned int m_chunk_size;
+	};
+}
+
+#endif
+/* vim: set noexpandtab: set shiftwidth=2: set tabstop=2: */