Add: [OSX] OpenGL video driver.

src/video/cocoa/cocoa_ogl.h

@@ -0,0 +1,59 @@
+/*
+ * 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 cocoa_ogl.h The Cocoa OpenGL video driver. */
+
+#ifndef VIDEO_COCOA_OGL_H
+#define VIDEO_COCOA_OGL_H
+
+#include "cocoa_v.h"
+
+@class OTTD_OpenGLView;
+
+class VideoDriver_CocoaOpenGL : public VideoDriver_Cocoa {
+	CGLContextObj gl_context;
+
+	uint8 *anim_buffer; ///< Animation buffer from OpenGL back-end.
+
+	const char *AllocateContext(bool allow_software);
+
+public:
+	VideoDriver_CocoaOpenGL() : gl_context(nullptr), anim_buffer(nullptr) {}
+
+	const char *Start(const StringList &param) override;
+	void Stop() override;
+
+	bool HasEfficient8Bpp() const override { return true; }
+
+	bool UseSystemCursor() override { return true; }
+
+	void ClearSystemSprites() override;
+
+	bool HasAnimBuffer() override { return true; }
+	uint8 *GetAnimBuffer() override { return this->anim_buffer; }
+
+	/** Return driver name */
+	const char *GetName() const override { return "cocoa-opengl"; }
+
+	void AllocateBackingStore(bool force = false) override;
+
+protected:
+	void Paint() override;
+
+	void *GetVideoPointer() override;
+	void ReleaseVideoPointer() override;
+
+	NSView* AllocateDrawView() override;
+};
+
+class FVideoDriver_CocoaOpenGL : public DriverFactoryBase {
+public:
+	FVideoDriver_CocoaOpenGL() : DriverFactoryBase(Driver::DT_VIDEO, 9, "cocoa-opengl", "Cocoa OpenGL Video Driver") {}
+	Driver *CreateInstance() const override { return new VideoDriver_CocoaOpenGL(); }
+};
+
+#endif /* VIDEO_COCOA_OGL_H */