EGLManager

fun createContext(config: EGLConfig): EGLContext

Creates an EGLContext from the given EGLConfig returning null if the context could not be created

fun initialize(): Unit

Initialize the EGLManager. This initializes the default display as well as queries the supported extensions

fun isExtensionSupported(extensionName: String): Boolean

Determines whether the extension with the provided name is supported. The string provided is expected to be one of the named extensions defined within the OpenGL extension documentation.

See EGLExt for additional documentation for given extension name constants and descriptions.

The set of supported extensions is configured after initialize is invoked. Attempts to query support for any extension beforehand will return false.

fun loadConfig(configAttributes: EGLConfigAttributes): EGLConfig?

Attempt to load an EGLConfig instance from the given EGLConfigAttributes. If the EGLConfig could not be loaded this returns null

fun makeCurrent(drawSurface: EGLSurface, readSurface: EGLSurface = drawSurface): Boolean

Binds the current context to the given draw and read surfaces. The draw surface is used for all operations except for any pixel data read back or copy operations which are taken from the read surface.

The same EGLSurface may be specified for both draw and read surfaces.

If the context is not previously configured, the only valid parameters for the draw and read surfaces is EGL14.EGL_NO_SURFACE. This is useful to make sure there is always a surface specified and to release the current context without assigning a new one.

See https://www.khronos.org/registry/EGL/sdk/docs/man/html/eglMakeCurrent.xhtml

fun release(): Unit

Release the resources allocated by EGLManager. This will destroy the corresponding EGLContext instance if it was previously initialized. The configured EGLVersion as well as EGLExtensions

fun swapAndFlushBuffers(): Unit

Post EGL surface color buffer to a native window. If the current drawing surface is single buffered this will flush the buffer

val currentDrawSurface: EGLSurface

Returns the current surface used for drawing pixel content

val currentReadSurface: EGLSurface

Returns the current surface used for reading back or copying pixels

val defaultSurface: EGLSurface

Returns the default surface. This can be an offscreen pixel buffer surface or EGL14.EGL_NO_SURFACE if the surfaceless context extension is supported.

val eglConfig: EGLConfig?

Returns the EGLConfig used to load the current EGLContext. This is configured after createContext is invoked.

val eglContext: EGLContext?

Returns the current EGLContext. This parameter is configured after initialize is invoked

val eglVersion: EGLVersion

Returns the EGL version that is supported. This parameter is configured after initialize is invoked.