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/* $Id$ */
/*
* 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"
#include "../core/geometry_type.hpp"
typedef void (*OGLProc)();
typedef OGLProc (*GetOGLProcAddressProc)(const char *proc);
bool IsOpenGLVersionAtLeast(byte major, byte minor);
/** Platform-independent back-end 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(GetOGLProcAddressProc get_proc);
static void Destroy();
bool Resize(int w, int h, bool force = false);
void Paint(Rect update_rect);
/**
* 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 */
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