Add initial O3DEngine and O3DRenderer

Only supports querying resolutions so far.

FossilOrigin-Name: c504ea5dd9a25bfe49c16f256d64f3bf8c16fc78fa03c2cad2561fbbb10eb720

src/O3DRenderer.h

@@ -0,0 +1,37 @@
+/*
+ * 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 <ObjFW/ObjFW.h>
+
+OF_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern OFString *const O3DRendererDeviceIndex;
+#ifdef __cplusplus
+}
+#endif
+
+@protocol O3DRenderer <OFObject>
+@property (readonly, nonatomic) OFSet OF_GENERIC(OFPair OF_GENERIC(OFValue *,
+    OFNumber *) *) *availableResolutions;
+
++ (instancetype)alloc;
+- (instancetype)initWithOptions:
+    (nullable OFDictionary OF_GENERIC(OFString *, id) *)options;
+@end
+
+OF_ASSUME_NONNULL_END