# Drawable Property Keys Keys to specify in the `drawableProperties` dictionary. ## Topics ### Constants [`let kEAGLDrawablePropertyColorFormat: String`](/documentation/OpenGLES/kEAGLDrawablePropertyColorFormat) The key specifying the internal color buffer format for the drawable surface. The value for this key is an `NSString` object that specifies a specific color buffer format. This color buffer format is used by the `EAGLContext` object to create the storage for a renderbuffer. The default value is `kEAGLColorFormatRGBA8`. [`let kEAGLDrawablePropertyRetainedBacking: String`](/documentation/OpenGLES/kEAGLDrawablePropertyRetainedBacking) The key specifying whether the drawable surface retains its contents after displaying them. The value for this key is an `NSNumber` object containing a `BOOL` data type. If `false`, you may not rely on the contents being the same after the contents are displayed. If `true`, then the contents will not change after being displayed. Setting the value to `true` is recommended only when you need the content to remain unchanged, as using it can result in both reduced performance and additional memory usage. The default value is `false`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)