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https://github.com/JGRennison/OpenTTD-patches.git
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56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file opengl.h OpenGL video driver support. */
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#ifndef VIDEO_OPENGL_H
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#define VIDEO_OPENGL_H
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#include "../core/alloc_type.hpp"
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#include "../core/geometry_type.hpp"
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typedef void (*OGLProc)();
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typedef OGLProc (*GetOGLProcAddressProc)(const char *proc);
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bool IsOpenGLVersionAtLeast(byte major, byte minor);
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const char *FindStringInExtensionList(const char *string, const char *substring);
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/** Platform-independent back-end class for OpenGL video drivers. */
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class OpenGLBackend : public ZeroedMemoryAllocator {
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private:
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static OpenGLBackend *instance; ///< Singleton instance pointer.
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GLuint vid_pbo; ///< Pixel buffer object storing the memory used for the video driver to draw to.
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GLuint vid_texture; ///< Texture handle for the video buffer texture.
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GLuint vao_quad; ///< Vertex array object storing the rendering state for the fullscreen quad.
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GLuint vbo_quad; ///< Vertex buffer with a fullscreen quad.
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OpenGLBackend();
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~OpenGLBackend();
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const char *Init();
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public:
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/** Get singleton instance of this class. */
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static inline OpenGLBackend *Get()
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{
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return OpenGLBackend::instance;
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}
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static const char *Create(GetOGLProcAddressProc get_proc);
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static void Destroy();
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bool Resize(int w, int h, bool force = false);
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void Paint();
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void *GetVideoBuffer();
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void ReleaseVideoBuffer(const Rect &update_rect);
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};
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#endif /* VIDEO_OPENGL_H */
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