Add initial O3DEngine and O3DRenderer

Only supports querying resolutions so far.

FossilOrigin-Name: c504ea5dd9a25bfe49c16f256d64f3bf8c16fc78fa03c2cad2561fbbb10eb720

src/O3DEngine.m

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2022 Jonathan Schleifer <js@nil.im>
+ *
+ * All rights reserved.
+ *
+ * This file is part of Obj3DEngine. It may be distributed under the terms of
+ * the Q Public License 1.0, which can be found in the file LICENSE.QPL
+ * included in the packaging of this file.
+ *
+ * Alternatively, it may be distributed under the terms of the GNU General
+ * Public License, either version 2 or 3, which can be found in the file
+ * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of
+ * this file.
+ */
+
+#import "O3DEngine.h"
+#import "O3DGlide3Renderer.h"
+
+@implementation O3DEngine
+@synthesize renderer = _renderer;
+
++ (OFArray OF_GENERIC(Class <O3DRenderer>) *)availableRenderers
+{
+	return [OFArray arrayWithObject: [O3DGlide3Renderer class]];
+}
+
+- (instancetype)
+    initWithRenderer: (Class <O3DRenderer>)renderer
+	     options: (OFDictionary OF_GENERIC(OFString *, id) *)options
+{
+	self = [super init];
+
+	@try {
+		_renderer = [[renderer alloc] initWithOptions: options];
+	} @catch (id e) {
+		[self release];
+		@throw e;
+	}
+
+	return self;
+}
+
+- (void)dealloc
+{
+	[_renderer release];
+
+	[super dealloc];
+}
+@end