Initializer

init(forOfflineGPUAt:colorSpace:options:sharedContext:)

Creates an OpenGL-based Core Image context using a GPU that is not currently driving a display, with the specified options.

Declaration

init?(forOfflineGPUAt index: UInt32, colorSpace: CGColorSpace?, options: [CIContextOption : Any]? = nil, sharedContext: CGLContextObj?)

Parameters

index

The index of the offline GPU with which to create the context; a number between zero and the value returned by the offlineGPUCount() method.

colorSpace

A color space object encapsulating color space information that is used to specify how color values are interpreted.

options

A dictionary that contains options for creating a CIContext object. You can pass any of the keys defined in Context Options along with the appropriate value.

sharedContext

A CGL context with which to share OpenGL resources, obtained by calling the CGL function CGLCreateContext(_:_:_:). Pass NULL to use a context that does not share OpenGL resources.

Return Value

A Core Image context.

Discussion

GPU devices that are not currently being used to drive a display can be used for Core Image rendering. Use the offlineGPUCount() method to determine whether any such GPUs are available.

To create a Metal-based Core Image context using an offline GPU, use the MTLCopyAllDevices() function to list Metal devices, then choose a device without a display to pass to the init(mtlDevice:) method.

See Also

Creating a Context for GPU-Based Rendering with OpenGL

init(cglContext: CGLContextObj, pixelFormat: CGLPixelFormatObj?, colorSpace: CGColorSpace?, options: [CIContextOption : Any]?)

Creates a Core Image context from a CGL context, using the specified options, color space, and pixel format object.

Deprecated
init(eaglContext: EAGLContext)

Creates a Core Image context from an EAGL context.

Deprecated
init(eaglContext: EAGLContext, options: [CIContextOption : Any]?)

Creates a Core Image context from an EAGL context using the specified options.

Deprecated
init?(forOfflineGPUAt: UInt32)

Creates an OpenGL-based Core Image context using a GPU that is not currently driving a display.

Deprecated