# GLKit Constants ## Topics ### Constants [`let GLKTextureLoaderApplyPremultiplication: String`](/documentation/GLKit/GLKTextureLoaderApplyPremultiplication) Whether image data should be premultiplied before being loaded into the sharegroup. [`let GLKTextureLoaderErrorDomain: String`](/documentation/GLKit/GLKTextureLoaderErrorDomain) The error domain used by GLKit when returning texture loading errors. [`let GLKTextureLoaderErrorKey: String`](/documentation/GLKit/GLKTextureLoaderErrorKey) A key used to retrieve an error string from an error object userinfo dictionary. [`let GLKTextureLoaderGLErrorKey: String`](/documentation/GLKit/GLKTextureLoaderGLErrorKey) A key used to retrieve additional information from an error object’s userinfo dictionary. [`let GLKTextureLoaderGenerateMipmaps: String`](/documentation/GLKit/GLKTextureLoaderGenerateMipmaps) Whether or not to create mipmaps for a texture. [`let GLKTextureLoaderGrayscaleAsAlpha: String`](/documentation/GLKit/GLKTextureLoaderGrayscaleAsAlpha) Whether or not to treat greyscale image data as alpha information. [`let GLKTextureLoaderOriginBottomLeft: String`](/documentation/GLKit/GLKTextureLoaderOriginBottomLeft) Whether or not to vertically flip image data to match OpenGL’s coordinate system. [`let GLKTextureLoaderSRGB: String`](/documentation/GLKit/GLKTextureLoaderSRGB) Whether or not to treat texture image data as sRGB data. [`var GLK_SSE3_INTRINSICS: Int32`](/documentation/GLKit/GLK_SSE3_INTRINSICS) [`let kGLKModelErrorDomain: String`](/documentation/GLKit/kGLKModelErrorDomain) [`let kGLKModelErrorKey: String`](/documentation/GLKit/kGLKModelErrorKey) --- 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)