Add: [Win32] Video driver that uses OpenGL to transfer the video buffer to the screen.

src/video/opengl.h

@@ -0,0 +1,49 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file opengl.h OpenGL video driver support. */
+
+#ifndef VIDEO_OPENGL_H
+#define VIDEO_OPENGL_H
+
+#include "../core/alloc_type.hpp"
+
+/** Platform-independent back-end singleton class for OpenGL video drivers. */
+class OpenGLBackend : public ZeroedMemoryAllocator {
+private:
+	static OpenGLBackend *instance; ///< Singleton instance pointer.
+
+	void *vid_buffer;   ///< Pointer to the memory used for the video driver to draw to.
+	GLuint vid_texture; ///< Texture handle for the video buffer texture.
+
+	OpenGLBackend();
+	~OpenGLBackend();
+
+	const char *Init();
+
+public:
+	/** Get singleton instance of this class. */
+	static inline OpenGLBackend *Get()
+	{
+		return OpenGLBackend::instance;
+	}
+	static const char *Create();
+	static void Destroy();
+
+	bool Resize(int w, int h, bool force = false);
+	void Paint();
+
+	/**
+	 * Get a pointer to the memory for the video driver to draw to.
+	 * @return Pointer to draw on.
+	 */
+	void *GetVideoBuffer() { return this->vid_buffer; }
+};
+
+#endif /* VIDEO_OPENGL_H */