GLContext (JOGL, NativeWindow and NEWT APIs)

java.lang.Object
- com.jogamp.opengl.GLContext

```
public abstract class GLContext
extends Object
```
Abstraction for an OpenGL rendering context. In order to perform OpenGL rendering, a context must be "made current" on the current thread. OpenGL rendering semantics specify that only one context may be current on the current thread at any given time, and also that a given context may be current on only one thread at any given time. Because components can be added to and removed from the component hierarchy at any time, it is possible that the underlying OpenGL context may need to be destroyed and recreated multiple times over the lifetime of a given component. This process is handled by the implementation, and the GLContext abstraction provides a stable object which clients can use to refer to a given context.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CONTEXT_CURRENT` Indicates that the context was made current during the last call to `makeCurrent`, value 1.
`static int`	`CONTEXT_CURRENT_NEW` Indicates that a newly-created context was made current during the last call to `makeCurrent`, value 2.
`static int`	`CONTEXT_NOT_CURRENT` Indicates that the context was not made current during the last call to `makeCurrent`, value 0.
`static int`	`CTX_OPTION_DEBUG` `ARB_create_context` related: flag debug.
`static boolean`	`DEBUG`
`static boolean`	`DEBUG_GL` Reflects property jogl.debug.DebugGL.
`static boolean`	`DEBUG_TRACE_SWITCH`
`static int[][]`	`ES_VERSIONS`
`static int[][]`	`GL_VERSIONS`
`static boolean`	`PROFILE_ALIASING` If `true` (default), bootstrapping the available GL profiles will use the highest compatible GL context for each profile, hence skipping querying lower profiles if a compatible higher one is found: 4.2-core -> 4.2-core, 3.3-core 4.2-comp -> 4.2-comp, 3.3-comp, 2 Otherwise the dedicated GL context would be queried and used: 4.2-core -> 4.2-core 3.3-core -> 3.3-core 4.2-comp -> 4.2-comp 3.3-comp -> 3.3-comp 3.0-comp -> 2 Using aliasing speeds up initialization about: Linux x86_64 - Nvidia: 28%, 700ms down to 500ms Linux x86_64 - AMD : 40%, 1500ms down to 900ms
`static boolean`	`TRACE_GL` Reflects property jogl.debug.TraceGL.
`static boolean`	`TRACE_SWITCH`
`static VersionNumber`	`Version1_0` Version 1.00, i.e.
`static VersionNumber`	`Version1_1` Version 1.1, i.e.
`static VersionNumber`	`Version1_10` Version 1.10, i.e.
`static VersionNumber`	`Version1_2` Version 1.2, i.e.
`static VersionNumber`	`Version1_20` Version 1.20, i.e.
`static VersionNumber`	`Version1_30` Version 1.30, i.e.
`static VersionNumber`	`Version1_4` Version 1.4, i.e.
`static VersionNumber`	`Version1_40` Version 1.40, i.e.
`static VersionNumber`	`Version1_5` Version 1.5, i.e.
`static VersionNumber`	`Version1_50` Version 1.50, i.e.
`static VersionNumber`	`Version3_0` Version 3.0.
`static VersionNumber`	`Version3_1` Version 3.1.
`static VersionNumber`	`Version3_2` Version 3.2.
`static VersionNumber`	`Version4_3` Version 4.3.

Method Summary

Methods
Modifier and Type	Method and Description
`abstract void`	`addGLDebugListener(GLDebugListener listener)` Add `GLDebugListener`.
`StringBuilder`	`append(StringBuilder sb)`
`Object`	`attachObject(String name, Object obj)` Sets the attached user object for the given name to this GLContext.
`boolean`	`bindSwapBarrier(int group, int barrier)`
`static boolean`	`clipGLVersion(int ctxProfile, int[] major, int[] minor)` Clip the given GL version to the maximum known valid version if exceeding.
`abstract void`	`copy(GLContext source, int mask)` Copies selected groups of OpenGL state variables from the supplied source context into this one.
`static boolean`	`decrementGLVersion(int ctxProfile, int[] major, int[] minor)` Decrement the given GL version by one and return true if still valid, otherwise false.
`abstract void`	`destroy()` Destroys this OpenGL context and frees its associated resources.
`Object`	`detachObject(String name)`
`abstract void`	`enableGLDebugMessage(boolean enable)` Enables or disables the GLDebugOutput feature of extension `GLExtensions.ARB_debug_output` or `GLExtensions.AMD_debug_output`, if available.
`Object`	`getAttachedObject(String name)` Returns the attached user object for the given name to this GLContext.
`abstract int`	`getBoundFramebuffer(int target)` Return the framebuffer name bound to this context, see `GL.glBindFramebuffer(int, int)`.
`abstract int`	`getContextCreationFlags()`
`List<GLContext>`	`getCreatedShares()` Returns a new list of created GLContext shared with this GLContext.
`static GLContext`	`getCurrent()` Returns this thread current context.
`static GL`	`getCurrentGL()` Returns the GL object bound to this thread current context.
`abstract int`	`getDefaultDrawFramebuffer()` Return the default draw framebuffer name.
`abstract int`	`getDefaultPixelDataFormat()` Get the default pixel data format, as required by e.g.
`abstract int`	`getDefaultPixelDataType()` Get the default pixel data type, as required by e.g.
`abstract int`	`getDefaultReadBuffer()` Returns the default color buffer within the current bound `getDefaultReadFramebuffer()`, i.e.
`abstract int`	`getDefaultReadFramebuffer()` Return the default read framebuffer name.
`abstract int`	`getDefaultVAO()` If this GLContext does not implement a default VAO, see `hasNoDefaultVAO()`, an own default VAO will be created and bound at context creation.
`List<GLContext>`	`getDestroyedShares()` Returns a new list of destroyed GLContext shared with this GLContext.
`abstract GL`	`getGL()` Returns the GL pipeline object for this GLContext.
`abstract String`	`getGLDebugMessageExtension()`
`abstract GLDrawable`	`getGLDrawable()` Returns the write-drawable this context uses for framebuffer operations.
`abstract int`	`getGLExtensionCount()` Returns the number of OpenGL extensions
`abstract String`	`getGLExtensionsString()` Returns a non-null (but possibly empty) string containing the space-separated list of available extensions.
`abstract GLDrawable`	`getGLReadDrawable()` Returns the read-Drawable this context uses for read framebuffer operations.
`VersionNumber`	`getGLSLVersionNumber()` Returns the matching GLSL version number, queried by this context GL via `GL2ES2.GL_SHADING_LANGUAGE_VERSION` if ≥ ES2.0 or GL2.0, otherwise a static match is being utilized.
`String`	`getGLSLVersionString()` Returns the GLSL version string as to be used in a shader program, including a terminating newline '\n', i.e.
`VersionNumberString`	`getGLVendorVersionNumber()` Returns the vendor's version, i.e.
`String`	`getGLVersion()` Returns a valid OpenGL version string, ie
`VersionNumber`	`getGLVersionNumber()` Returns this context OpenGL version.
`long`	`getHandle()` Returns the underlying native OpenGL context handle
`static int`	`getMaxMajor(int ctxProfile)`
`static int`	`getMaxMinor(int ctxProfile, int major)`
`int`	`getMaxRenderbufferSamples()` Returns the maximum number of FBO RENDERBUFFER samples if `full FBO is supported`, otherwise false.
`abstract int`	`getPlatformExtensionCount()` Returns the number of platform extensions
`abstract String`	`getPlatformExtensionsString()` Returns a non-null (but possibly empty) string containing the space-separated list of available platform-dependent (e.g., WGL, GLX) extensions.
`GLRendererQuirks`	`getRendererQuirks()` Returns the instance of `GLRendererQuirks`, allowing one to determine workarounds.
`abstract GL`	`getRootGL()` Returns the implementing root GL instance of this GLContext's GL object, considering a wrapped pipelined hierarchy, see `GLBase.getDownstreamGL()`.
`GLContext`	`getSharedMaster()` Returns the shared master GLContext of this GLContext if shared, otherwise return `null`.
`int`	`getSwapGroup()`
`int`	`getSwapInterval()` Return the current swap interval.
`abstract void`	`glDebugMessageControl(int source, int type, int severity, int count, int[] ids, int ids_offset, boolean enabled)` Generic entry for `GL2ES2.glDebugMessageControl(int, int, int, int, int[], int, boolean)` and `GL2GL3.glDebugMessageEnableAMD(int, int, int, int[], int, boolean)` of the GLDebugOutput feature.
`abstract void`	`glDebugMessageControl(int source, int type, int severity, int count, IntBuffer ids, boolean enabled)` Generic entry for `GL2ES2.glDebugMessageControl(int, int, int, int, IntBuffer, boolean)` and `GL2GL3.glDebugMessageEnableAMD(int, int, int, IntBuffer, boolean)` of the GLDebugOutput feature.
`abstract void`	`glDebugMessageInsert(int source, int type, int id, int severity, String buf)` Generic entry for `GL2ES2.glDebugMessageInsert(int, int, int, int, int, String)` and `GL2GL3.glDebugMessageInsertAMD(int, int, int, int, String)` of the GLDebugOutput feature.
`boolean`	`hasBasicFBOSupport()` Returns `true` if basic FBO support is available, otherwise `false`.
`boolean`	`hasFP32CompatAPI()` Returns `true` if `OES_single_precision`, fp32, fixed function point (FFP) compatibility entry points available, otherwise `false`.
`boolean`	`hasFullFBOSupport()` Returns `true` if full FBO support is available, otherwise `false`.
`boolean`	`hasGLSL()`
`boolean`	`hasNoDefaultVAO()` Indicates whether this GLContext's native profile does not implement a default vertex array object (VAO), starting w/ OpenGL 3.1 core.
`boolean`	`hasRendererQuirk(int quirk)` Returns true if the `quirk` exist in `getRendererQuirks()`, otherwise false.
`boolean`	`isCPUDataSourcingAvail()` Indicates whether this GLContext allows CPU data sourcing (indices, vertices ..) as opposed to using a GPU buffer source (VBO), e.g.
`boolean`	`isCreated()` Indicates whether the underlying native OpenGL context has been created.
`boolean`	`isCreatedWithARBMethod()`
`boolean`	`isCurrent()`
`abstract boolean`	`isExtensionAvailable(String glExtensionName)` Returns true if the specified OpenGL extension can be successfully called using this GL context given the current host (OpenGL client) and display (OpenGL server) configuration.
`static boolean`	`isFBOAvailable(AbstractGraphicsDevice device, GLProfile glp)` Returns true if it is possible to create an framebuffer object (FBO).
`abstract boolean`	`isFunctionAvailable(String glFunctionName)` Returns true if the specified OpenGL core- or extension-function can be successfully called using this GL context given the current host (OpenGL client) and display (OpenGL server) configuration.
`boolean`	`isGL2()` Indicates whether this GLContext is capable of GL2.
`static boolean`	`isGL2Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGL2ES1()` Indicates whether this GLContext is capable of GL2ES1.
`boolean`	`isGL2ES2()` Indicates whether this GLContext is capable of GL2ES2.
`boolean`	`isGL2ES3()` Indicates whether this GLContext is capable of GL2ES3.
`boolean`	`isGL2GL3()` Indicates whether this GLContext is capable of GL2GL3.
`boolean`	`isGL3()` Indicates whether this GLContext is capable of GL3.
`static boolean`	`isGL3Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGL3bc()` Indicates whether this GLContext is capable of GL3bc.
`static boolean`	`isGL3bcAvailable(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGL3core()` Indicates whether this GLContext uses a GL3 core profile.
`boolean`	`isGL3ES3()` Indicates whether this GLContext is capable of GL3ES3.
`boolean`	`isGL4()` Indicates whether this GLContext is capable of GL4.
`static boolean`	`isGL4Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGL4bc()` Indicates whether this GLContext is capable of GL4bc.
`static boolean`	`isGL4bcAvailable(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGL4core()` Indicates whether this GLContext uses a GL4 core profile.
`boolean`	`isGL4ES3()` Returns true if this profile is capable of GL4ES3, i.e.
`boolean`	`isGLCompatibilityProfile()`
`boolean`	`isGLcore()` Indicates whether this GLContext uses a GL core profile.
`boolean`	`isGLCoreProfile()`
`boolean`	`isGLDebugEnabled()`
`abstract boolean`	`isGLDebugMessageEnabled()`
`abstract boolean`	`isGLDebugSynchronous()`
`boolean`	`isGLES()` Indicates whether this GLContext is capable of GLES.
`boolean`	`isGLES1()` Indicates whether this GLContext is capable of GLES1.
`static boolean`	`isGLES1Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGLES2()` Indicates whether this GLContext is capable of GLES2.
`static boolean`	`isGLES2Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGLES2Compatible()`
`boolean`	`isGLES3()` Indicates whether this GLContext is capable of GLES3.
`boolean`	`isGLES31Compatible()` Return true if this context is an ES3 context ≥ 3.1 or implements the extension `GL_ARB_ES3_1_compatibility`, otherwise false.
`static boolean`	`isGLES31CompatibleAvailable(AbstractGraphicsDevice device)` Returns true if a ES3 ≥ 3.1 compatible profile is available, i.e.
`boolean`	`isGLES32Compatible()` Return true if this context is an ES3 context ≥ 3.2 or implements the extension `GL_ARB_ES3_2_compatibility`, otherwise false.
`static boolean`	`isGLES32CompatibleAvailable(AbstractGraphicsDevice device)` Returns true if a ES3 ≥ 3.2 compatible profile is available, i.e.
`static boolean`	`isGLES3Available(AbstractGraphicsDevice device, boolean[] isHardware)`
`boolean`	`isGLES3Compatible()` Return true if this context is an ES3 context or implements the extension `GL_ARB_ES3_compatibility`, otherwise false.
`static boolean`	`isGLES3CompatibleAvailable(AbstractGraphicsDevice device)` Returns true if a ES3 compatible profile is available, i.e.
`boolean`	`isGLESProfile()`
`boolean`	`isGLForwardCompatible()`
`abstract boolean`	`isGLReadDrawableAvailable()` Query whether using a distinguished read-drawable is supported.
`boolean`	`isHardwareRasterizer()`
`static int`	`isHardwareRasterizer(AbstractGraphicsDevice device, GLProfile glp)`
`boolean`	`isNPOTTextureAvailable()` Note: The GL impl.
`boolean`	`isShared()` Returns true if this GLContext is shared, otherwise false.
`boolean`	`isTextureFormatBGRA8888Available()`
`static boolean`	`isValidGLVersion(int ctxProfile, int major, int minor)` Returns true, if the major.minor is not inferior to the lowest valid version and does not exceed the highest known major number by more than one.
`boolean`	`joinSwapGroup(int group)`
`abstract int`	`makeCurrent()` Makes this GLContext current on the calling thread.
`static String`	`makeCurrentResultToString(int res)` Returns a String representation of the `makeCurrent()` result.
`boolean`	`queryMaxSwapGroups(int[] maxGroups, int maxGroups_offset, int[] maxBarriers, int maxBarriers_offset)`
`abstract void`	`release()` Releases control of this GLContext from the current thread.
`abstract void`	`removeGLDebugListener(GLDebugListener listener)` Remove `GLDebugListener`.
`abstract void`	`setContextCreationFlags(int flags)`
`abstract GL`	`setGL(GL gl)` Sets the GL pipeline object for this GLContext.
`abstract void`	`setGLDebugSynchronous(boolean synchronous)` Enables or disables the synchronous debug behavior via `glEnable/glDisable(GL_DEBUG_OUTPUT_SYNCHRONOUS)`, if extension is `GLExtensions.ARB_debug_output`.
`abstract GLDrawable`	`setGLDrawable(GLDrawable readWrite, boolean setWriteOnly)` Sets the read/write drawable for framebuffer operations, i.e.
`abstract GLDrawable`	`setGLReadDrawable(GLDrawable read)` Set the read-Drawable for read framebuffer operations. The caller should query if this feature is supported via `isGLReadDrawableAvailable()`.
`boolean`	`setSwapInterval(int interval)` Set the swap interval of the current context and attached onscreen `GLDrawable`.
`String`	`toString()` Classname, GL, GLDrawable
`void`	`validateCurrent()`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail
- DEBUG
```
public static final boolean DEBUG
```
- TRACE_SWITCH
```
public static final boolean TRACE_SWITCH
```
- DEBUG_TRACE_SWITCH
```
public static final boolean DEBUG_TRACE_SWITCH
```
- PROFILE_ALIASING
```
public static final boolean PROFILE_ALIASING
```
  If true (default), bootstrapping the available GL profiles will use the highest compatible GL context for each profile, hence skipping querying lower profiles if a compatible higher one is found:
  - 4.2-core -> 4.2-core, 3.3-core
  - 4.2-comp -> 4.2-comp, 3.3-comp, 2
  Otherwise the dedicated GL context would be queried and used:
  - 4.2-core -> 4.2-core
  - 3.3-core -> 3.3-core
  - 4.2-comp -> 4.2-comp
  - 3.3-comp -> 3.3-comp
  - 3.0-comp -> 2
  Using aliasing speeds up initialization about:
  - Linux x86_64 - Nvidia: 28%, 700ms down to 500ms
  - Linux x86_64 - AMD : 40%, 1500ms down to 900ms
- DEBUG_GL
```
public static final boolean DEBUG_GL
```
  Reflects property jogl.debug.DebugGL. If true, the debug pipeline is enabled at context creation.
- TRACE_GL
```
public static final boolean TRACE_GL
```
  Reflects property jogl.debug.TraceGL. If true, the trace pipeline is enabled at context creation.
- CONTEXT_NOT_CURRENT
```
public static final int CONTEXT_NOT_CURRENT
```
  Indicates that the context was not made current during the last call to makeCurrent, value 0.
  
  See Also:
  Constant Field Values
- CONTEXT_CURRENT
```
public static final int CONTEXT_CURRENT
```
  Indicates that the context was made current during the last call to makeCurrent, value 1.
  
  See Also:
  Constant Field Values
- CONTEXT_CURRENT_NEW
```
public static final int CONTEXT_CURRENT_NEW
```
  Indicates that a newly-created context was made current during the last call to makeCurrent, value 2.
  
  See Also:
  Constant Field Values
- Version1_0
```
public static final VersionNumber Version1_0
```
  Version 1.00, i.e. GLSL 1.00 for ES 2.0.
- Version1_10
```
public static final VersionNumber Version1_10
```
  Version 1.10, i.e. GLSL 1.10 for GL 2.0.
- Version1_20
```
public static final VersionNumber Version1_20
```
  Version 1.20, i.e. GLSL 1.20 for GL 2.1.
- Version1_30
```
public static final VersionNumber Version1_30
```
  Version 1.30, i.e. GLSL 1.30 for GL 3.0.
- Version1_40
```
public static final VersionNumber Version1_40
```
  Version 1.40, i.e. GLSL 1.40 for GL 3.1.
- Version1_50
```
public static final VersionNumber Version1_50
```
  Version 1.50, i.e. GLSL 1.50 for GL 3.2.
- Version1_1
```
public static final VersionNumber Version1_1
```
  Version 1.1, i.e. GL 1.1
- Version1_2
```
public static final VersionNumber Version1_2
```
  Version 1.2, i.e. GL 1.2
- Version1_4
```
public static final VersionNumber Version1_4
```
  Version 1.4, i.e. GL 1.4
- Version1_5
```
public static final VersionNumber Version1_5
```
  Version 1.5, i.e. GL 1.5
- Version3_0
```
public static final VersionNumber Version3_0
```
  Version 3.0. As an OpenGL version, it qualifies for desktop isGL2() only, or ES 3.0. Or GLSL 3.00 for ES 3.0.
- Version3_1
```
public static final VersionNumber Version3_1
```
  Version 3.1. As an OpenGL version, it qualifies for isGL3core(), isGL3bc() and isGL3()
- Version3_2
```
public static final VersionNumber Version3_2
```
  Version 3.2. As an OpenGL version, it qualifies for geometry shader
- Version4_3
```
public static final VersionNumber Version4_3
```
  Version 4.3. As an OpenGL version, it qualifies for GL_ARB_ES3_compatibility
- CTX_OPTION_DEBUG
```
public static final int CTX_OPTION_DEBUG
```
  ARB_create_context related: flag debug. Cache key value. See setContextCreationFlags(int), GLAutoDrawable.setContextCreationFlags(int), getAvailableContextProperties(AbstractGraphicsDevice, GLProfile).
  
  See Also:
  Constant Field Values
- GL_VERSIONS
```
public static final int[][] GL_VERSIONS
```
- ES_VERSIONS
```
public static final int[][] ES_VERSIONS
```

Method Detail

isShared
```
public final boolean isShared()
```
Returns true if this GLContext is shared, otherwise false.

getSharedMaster
```
public final GLContext getSharedMaster()
```
Returns the shared master GLContext of this GLContext if shared, otherwise return null.
Returns this GLContext, if it is a shared master.

Since:

2.2.1

getCreatedShares
```
public final List<GLContext> getCreatedShares()
```
Returns a new list of created GLContext shared with this GLContext.

getDestroyedShares
```
public final List<GLContext> getDestroyedShares()
```
Returns a new list of destroyed GLContext shared with this GLContext.

getRendererQuirks
```
public final GLRendererQuirks getRendererQuirks()
```
Returns the instance of GLRendererQuirks, allowing one to determine workarounds.

Returns:
instance of GLRendererQuirks if context was made current once, otherwise null.

hasRendererQuirk
```
public final boolean hasRendererQuirk(int quirk)
                               throws IllegalArgumentException
```
Returns true if the quirk exist in getRendererQuirks(), otherwise false.
Convenience method for:
```
    final GLRendererQuirks glrq = ctx.getRendererQuirks();
    boolean hasQuirk = null != glrq ? glrq.exist(quirk) : false ;
 
```
Parameters:
quirk - the quirk to be tested, e.g. GLRendererQuirks.NoDoubleBufferedPBuffer.

Throws:

IllegalArgumentException - if the quirk is out of range

setGLDrawable
```
public abstract GLDrawable setGLDrawable(GLDrawable readWrite,
                       boolean setWriteOnly)
```
Sets the read/write drawable for framebuffer operations, i.e. reassociation of the context's drawable.
If the arguments reflect the current state of this context this method is a no-operation and returns the old and current GLDrawable.

Remarks:
- glFinish() is issued if context isCreated() and a previous drawable was bound before disassociation.
- If the context was current on this thread, it is being released before drawable reassociation and made current afterwards.
- Implementation may issue makeCurrent() and release() while drawable reassociation.
- The user shall take extra care of thread synchronization, i.e. lock the involved drawable's NativeSurfaces to avoid a race condition. In case auto-drawable's are used, their upstream-lock must be locked beforehand see GLAutoDrawable Locking.
Parameters:
readWrite - The read/write drawable for framebuffer operations, maybe null to remove association.
setWriteOnly - Only change the write-drawable, if setWriteOnly is true and if the read-drawable differs from the write-drawable. Otherwise set both drawables, read and write.

Returns:
The previous read/write drawable if operation succeeds

Throws:

GLException - in case null is being passed, this context is made current on another thread or operation fails.
See Also:
isGLReadDrawableAvailable(), setGLReadDrawable(GLDrawable), getGLReadDrawable(), setGLDrawable(GLDrawable, boolean), getGLDrawable()

getGLDrawable
```
public abstract GLDrawable getGLDrawable()
```
Returns the write-drawable this context uses for framebuffer operations.
If the read-drawable has not been changed manually via setGLReadDrawable(GLDrawable), it equals to the write-drawable (default).

Method is only thread-safe while context is made current.

See Also:
setGLDrawable(GLDrawable, boolean), setGLReadDrawable(GLDrawable)

isGLReadDrawableAvailable
```
public abstract boolean isGLReadDrawableAvailable()
```
Query whether using a distinguished read-drawable is supported.

Returns:
true if using a read-drawable is supported with your driver/OS, otherwise false.

setGLReadDrawable
```
public abstract GLDrawable setGLReadDrawable(GLDrawable read)
```
Set the read-Drawable for read framebuffer operations.
The caller should query if this feature is supported via isGLReadDrawableAvailable().
If the context was current on this thread, it is being released before switching the drawable and made current afterwards. However the user shall take extra care that not other thread attempts to make this context current. Otherwise a race condition may happen.

Parameters:
read - the read-drawable for read framebuffer operations. If null is passed, the default write drawable will be set.

Returns:
the previous read-drawable

Throws:

GLException - in case a read drawable is not supported or this context is made current on another thread.
See Also:
isGLReadDrawableAvailable(), getGLReadDrawable()

getGLReadDrawable
```
public abstract GLDrawable getGLReadDrawable()
```
Returns the read-Drawable this context uses for read framebuffer operations.
If the read-drawable has not been changed manually via setGLReadDrawable(GLDrawable), it equals to the write-drawable (default).

Method is only thread-safe while context is made current.

See Also:
isGLReadDrawableAvailable(), setGLReadDrawable(GLDrawable), getGLReadDrawable()

makeCurrent
```
public abstract int makeCurrent()
                         throws GLException
```
Makes this GLContext current on the calling thread.
Recursive call to makeCurrent() and hence release() are supported.

There are two return values that indicate success and one that indicates failure.

A return value of CONTEXT_CURRENT_NEW indicates that that context has been made current for the 1st time, or that the state of the underlying context or drawable has changed since the last time this context was current. In this case, the application may wish to initialize the render state.

A return value of CONTEXT_CURRENT indicates that the context has been made current, with its previous state restored.

If the context could not be made current (for example, because the underlying drawable has not ben realized on the display) , a value of CONTEXT_NOT_CURRENT is returned.

This method is blocking, i.e. waits until another thread has released the context.

The drawable's surface is being locked at entry and unlocked at release()
Returns:
- CONTEXT_CURRENT_NEW if the context was successfully made current the 1st time,
- CONTEXT_CURRENT if the context was successfully made current,
- CONTEXT_NOT_CURRENT if the context could not be made current.
Throws:

GLException - if the context could not be created or made current due to non-recoverable, system-specific errors.

release
```
public abstract void release()
                      throws GLException
```
Releases control of this GLContext from the current thread.
Recursive call to release() and hence makeCurrent() are supported.

The drawable's surface is being unlocked at exit, assumed to be locked by makeCurrent().

Throws:

GLException - if the context had not previously been made current on the current thread

copy
```
public abstract void copy(GLContext source,
        int mask)
                   throws GLException
```
Copies selected groups of OpenGL state variables from the supplied source context into this one. The mask parameter indicates which groups of state variables are to be copied. mask contains the bitwise OR of the same symbolic names that are passed to the GL command glPushAttrib. The single symbolic constant GL_ALL_ATTRIB_BITS can be used to copy the maximum possible portion of rendering state.
Not all values for GL state can be copied. For example, pixel pack and unpack state, render mode state, and select and feedback state are not copied. The state that can be copied is exactly the state that is manipulated by the GL command glPushAttrib.
On most platforms, this context may not be current to any thread, including the calling thread, when this method is called. Some platforms have additional requirements such as whether this context or the source context must occasionally be made current in order for the results of the copy to be seen; these requirements are beyond the scope of this specification.

Parameters:
source - the source OpenGL context from which to copy state
mask - a mask of symbolic names indicating which groups of state to copy

Throws:

GLException - if an OpenGL-related error occurred

getCurrentGL
```
public static GL getCurrentGL()
                       throws GLException
```
Returns the GL object bound to this thread current context. If no context is current, throw an GLException

Returns:
the current context's GL object on this thread

Throws:

GLException - if no context is current

getCurrent
```
public static GLContext getCurrent()
```
Returns this thread current context. If no context is current, returns null.

Returns:
the context current on this thread, or null if no context is current.

isCurrent
```
public final boolean isCurrent()
```
Returns:
true if this GLContext is current on this thread

validateCurrent

public final void validateCurrent()
                           throws GLException

Throws:: GLException - if this GLContext is not current on this thread

makeCurrentResultToString
```
public static final String makeCurrentResultToString(int res)
```
Returns a String representation of the makeCurrent() result.

destroy
```
public abstract void destroy()
```
Destroys this OpenGL context and frees its associated resources.
The context may be current w/o recursion when calling destroy(), in which case this method destroys the context and releases the lock.

getRootGL
```
public abstract GL getRootGL()
```
Returns the implementing root GL instance of this GLContext's GL object, considering a wrapped pipelined hierarchy, see GLBase.getDownstreamGL().

Throws:

GLException - if the root instance is not a GL implementation
See Also:
GLBase.getRootGL(), GLBase.getDownstreamGL(), getGL(), setGL(GL)

getGL
```
public abstract GL getGL()
```
Returns the GL pipeline object for this GLContext.

Returns:
the aggregated GL instance, or null if this context was not yet made current.

setGL
```
public abstract GL setGL(GL gl)
```
Sets the GL pipeline object for this GLContext.

Returns:
the set GL pipeline or null if not successful

getHandle
```
public final long getHandle()
```
Returns the underlying native OpenGL context handle

isCreated
```
public final boolean isCreated()
```
Indicates whether the underlying native OpenGL context has been created.

getAttachedObject
```
public final Object getAttachedObject(String name)
```
Returns the attached user object for the given name to this GLContext.

attachObject
```
public final Object attachObject(String name,
                  Object obj)
```
Sets the attached user object for the given name to this GLContext. Returns the previously set object or null.

detachObject

public final Object detachObject(String name)

toString
```
public String toString()
```
Classname, GL, GLDrawable

Overrides:

toString in class Object

append

public final StringBuilder append(StringBuilder sb)

isFunctionAvailable
```
public abstract boolean isFunctionAvailable(String glFunctionName)
```
Returns true if the specified OpenGL core- or extension-function can be successfully called using this GL context given the current host (OpenGL client) and display (OpenGL server) configuration. See GLBase.isFunctionAvailable(String) for more details.

Parameters:
glFunctionName - the name of the OpenGL function (e.g., use "glPolygonOffsetEXT" or "glPolygonOffset" to check if the GL.glPolygonOffset(float,float) is available).

isExtensionAvailable
```
public abstract boolean isExtensionAvailable(String glExtensionName)
```
Returns true if the specified OpenGL extension can be successfully called using this GL context given the current host (OpenGL client) and display (OpenGL server) configuration. See GLBase.isExtensionAvailable(String) for more details.

Parameters:
glExtensionName - the name of the OpenGL extension (e.g., "GL_VERTEX_PROGRAM_ARB").

getPlatformExtensionCount
```
public abstract int getPlatformExtensionCount()
```
Returns the number of platform extensions

getPlatformExtensionsString
```
public abstract String getPlatformExtensionsString()
```
Returns a non-null (but possibly empty) string containing the space-separated list of available platform-dependent (e.g., WGL, GLX) extensions. Can only be called while this context is current.

getGLExtensionCount
```
public abstract int getGLExtensionCount()
```
Returns the number of OpenGL extensions

getGLExtensionsString
```
public abstract String getGLExtensionsString()
```
Returns a non-null (but possibly empty) string containing the space-separated list of available extensions. Can only be called while this context is current. This is equivalent to glGetString(GL_EXTENSIONS)

getContextCreationFlags
```
public abstract int getContextCreationFlags()
```
Returns:
Additional context creation flags, supported: CTX_OPTION_DEBUG.

setContextCreationFlags
```
public abstract void setContextCreationFlags(int flags)
```
Parameters:
flags - Additional context creation flags, supported: CTX_OPTION_DEBUG. Unsupported flags are masked out. Only affects this context state if not created yet via makeCurrent().
See Also:
enableGLDebugMessage(boolean), GLAutoDrawable.setContextCreationFlags(int)

getGLVersion

public final String getGLVersion()

Returns a valid OpenGL version string, ie

     major.minor ([option]?[options,]*) - gl-version

options
- ES profile ES profile
- Compatibility profile Compatibility profile including fixed function pipeline and deprecated functionality
- Core profile Core profile
- forward Forward profile excluding deprecated functionality
- arb refers to an ARB_create_context created context
- debug refers to a debug context
- ES2 compatible refers to an ES2 compatible implementation
- software refers to a software implementation of the rasterizer
- hardware refers to a hardware implementation of the rasterizer
gl-version the GL_VERSION string

e.g.:


row 2, cell 1	row 2, cell 2

	ES2	`2.0 (ES profile, ES2 compatible, hardware) - 2.0 ES Profile`
ATI	GL2	`3.0 (Compatibility profile, arb, hardware) - 3.2.9704 Compatibility Profile Context`
ATI	GL3	`3.3 (Core profile, any, new, hardware) - 1.4 (3.2.9704 Compatibility Profile Context)`
ATI	GL3bc	`3.3 (Compatibility profile, arb, hardware) - 1.4 (3.2.9704 Compatibility Profile Context)`
NV	GL2	`3.0 (Compatibility profile, arb, hardware) - 3.0.0 NVIDIA 195.36.07.03`
NV	GL3	`3.3 (Core profile, arb, hardware) - 3.3.0 NVIDIA 195.36.07.03`
NV	GL3bc	`3.3 (Compatibility profile, arb, hardware) - 3.3.0 NVIDIA 195.36.07.03`
NV	GL2	`3.0 (Compatibility profile, arb, ES2 compatible, hardware) - 3.0.0 NVIDIA 290.10`

getGLVersionNumber
```
public final VersionNumber getGLVersionNumber()
```
Returns this context OpenGL version.

See Also:
getGLSLVersionNumber()

getGLVendorVersionNumber
```
public final VersionNumberString getGLVendorVersionNumber()
```
Returns the vendor's version, i.e. version number at the end of GL_VERSION not being the GL version.
In case no such version exists within GL_VERSION, the zero version instance is returned.

The vendor's version is usually the vendor's OpenGL driver version.

isGLCompatibilityProfile

public final boolean isGLCompatibilityProfile()

isGLCoreProfile

public final boolean isGLCoreProfile()

isGLESProfile
```
public final boolean isGLESProfile()
```

isGLForwardCompatible

public final boolean isGLForwardCompatible()

isGLDebugEnabled

public final boolean isGLDebugEnabled()

isCreatedWithARBMethod

public final boolean isCreatedWithARBMethod()

getGLSLVersionNumber
```
public final VersionNumber getGLSLVersionNumber()
```
Returns the matching GLSL version number, queried by this context GL via GL2ES2.GL_SHADING_LANGUAGE_VERSION if ≥ ES2.0 or GL2.0, otherwise a static match is being utilized.
The context must have been current once, otherwise the zero version instance is returned.

Examples w/ major.minor:
```
    1.00 (ES 2.0), 3.00 (ES 3.0)
    1.10 (GL 2.0), 1.20 (GL 2.1), 1.50 (GL 3.2),
    3.30 (GL 3.3), 4.00 (GL 4.0), 4.10 (GL 4.1), 4.20 (GL 4.2)
 
```
Matching could also refer to the maximum GLSL version usable by this context since normal GL implementations are capable of using a lower GLSL version as well. The latter is not true on OSX w/ a GL3 context.
Returns:
GLSL version number if context has been made current at least once, otherwise the zero version instance is returned.
See Also:
getGLVersionNumber()

getGLSLVersionString
```
public final String getGLSLVersionString()
```
Returns the GLSL version string as to be used in a shader program, including a terminating newline '\n', i.e. for desktop
```
    #version 110
    ..
    #version 150 core
    #version 330 compatibility
    ...
 
```
And for ES:
```
    #version 100
    #version 300 es
    ..
 
```
If context has not been made current yet, a string of zero length is returned.
See Also:
getGLSLVersionNumber()

isGLES2Compatible
```
public final boolean isGLES2Compatible()
```
Returns:
true if this context is an ES2 context or implements the extension GL_ARB_ES3_compatibility or GL_ARB_ES2_compatibility, otherwise false

isGLES3Compatible
```
public final boolean isGLES3Compatible()
```
Return true if this context is an ES3 context or implements the extension GL_ARB_ES3_compatibility, otherwise false.
Includes [ GL ≥ 4.3, GL ≥ 3.1 w/ GL_ARB_ES3_compatibility and GLES3 ]

isGLES31Compatible
```
public final boolean isGLES31Compatible()
```
Return true if this context is an ES3 context ≥ 3.1 or implements the extension GL_ARB_ES3_1_compatibility, otherwise false.
Includes [ GL ≥ 4.5, GL ≥ 3.1 w/ GL_ARB_ES3_1_compatibility and GLES3 ≥ 3.1 ]

isGLES32Compatible
```
public final boolean isGLES32Compatible()
```
Return true if this context is an ES3 context ≥ 3.2 or implements the extension GL_ARB_ES3_2_compatibility, otherwise false.
Includes [ GL ≥ 4.5, GL ≥ 3.1 w/ GL_ARB_ES3_2_compatibility and GLES3 ≥ 3.2 ]

isHardwareRasterizer
```
public final boolean isHardwareRasterizer()
```
Returns:
true if impl. is a hardware rasterizer, otherwise false.
See Also:
isHardwareRasterizer(AbstractGraphicsDevice, GLProfile), GLProfile.isHardwareRasterizer()

hasGLSL
```
public final boolean hasGLSL()
```
Returns:
true if context supports GLSL, i.e. is either isGLES3(), isGLES2(), isGL3() or isGL2() and major-version > 1.
See Also:
GLProfile.hasGLSL()

hasBasicFBOSupport
```
public final boolean hasBasicFBOSupport()
```
Returns true if basic FBO support is available, otherwise false.
Basic FBO is supported if the context is either GL-ES >= 2.0, GL >= 3.0 [core, compat] or implements the extensions GL_ARB_ES2_compatibility, GL_ARB_framebuffer_object, GL_EXT_framebuffer_object or GL_OES_framebuffer_object.

Basic FBO support may only include one color attachment and no multisampling, as well as limited internal formats for renderbuffer.

See Also:
CTX_IMPL_FBO

hasFullFBOSupport
```
public final boolean hasFullFBOSupport()
```
Returns true if full FBO support is available, otherwise false.
Full FBO is supported if the context is either GL >= 3.0 [ES, core, compat] or implements the extensions ARB_framebuffer_object, or all of EXT_framebuffer_object, EXT_framebuffer_multisample, EXT_framebuffer_blit, GL_EXT_packed_depth_stencil.

Full FBO support includes multiple color attachments and multisampling.

hasFP32CompatAPI
```
public final boolean hasFP32CompatAPI()
```
Returns true if OES_single_precision, fp32, fixed function point (FFP) compatibility entry points available, otherwise false.

See Also:
CTX_IMPL_FP32_COMPAT_API

getMaxRenderbufferSamples
```
public final int getMaxRenderbufferSamples()
```
Returns the maximum number of FBO RENDERBUFFER samples if full FBO is supported, otherwise false.

isNPOTTextureAvailable
```
public boolean isNPOTTextureAvailable()
```
Note: The GL impl. may return a const value, ie GLBase.isNPOTTextureAvailable() always returns true.

isTextureFormatBGRA8888Available

public boolean isTextureFormatBGRA8888Available()

isGL4bc
```
public final boolean isGL4bc()
```
Indicates whether this GLContext is capable of GL4bc.
Includes [ GL4bc ].

See Also:
GLProfile.isGL4bc()

isGL4
```
public final boolean isGL4()
```
Indicates whether this GLContext is capable of GL4.
Includes [ GL4bc, GL4 ].

See Also:
GLProfile.isGL4()

isGL4core
```
public final boolean isGL4core()
```
Indicates whether this GLContext uses a GL4 core profile.
Includes [ GL4 ].

isGL3bc
```
public final boolean isGL3bc()
```
Indicates whether this GLContext is capable of GL3bc.
Includes [ GL4bc, GL3bc ].

See Also:
GLProfile.isGL3bc()

isGL3
```
public final boolean isGL3()
```
Indicates whether this GLContext is capable of GL3.
Includes [ GL4bc, GL4, GL3bc, GL3 ].

See Also:
GLProfile.isGL3()

isGL3core
```
public final boolean isGL3core()
```
Indicates whether this GLContext uses a GL3 core profile.
Includes [ GL4, GL3 ].

isGLcore
```
public final boolean isGLcore()
```
Indicates whether this GLContext uses a GL core profile.
Includes [ GL4, GL3, GLES3, GLES2 ].

isCPUDataSourcingAvail
```
public final boolean isCPUDataSourcingAvail()
```
Indicates whether this GLContext allows CPU data sourcing (indices, vertices ..) as opposed to using a GPU buffer source (VBO), e.g. GL2ES1.glDrawElements(int, int, int, java.nio.Buffer).
Includes [GL2ES1, GLES2] == [ GL4bc, GL3bc, GL2, GLES1, GL2ES1, GLES2 ].

See Bug 852 - https://jogamp.org/bugzilla/show_bug.cgi?id=852

hasNoDefaultVAO

public final boolean hasNoDefaultVAO()

Indicates whether this GLContext's native profile does not implement a default vertex array object (VAO), starting w/ OpenGL 3.1 core.

Includes [ GL4, GL3 ].

     Due to GL 3.1 core spec: E.1. DEPRECATED AND REMOVED FEATURES (p 296),
            GL 3.2 core spec: E.2. DEPRECATED AND REMOVED FEATURES (p 331)
     there is no more default VAO buffer 0 bound, hence generating and binding one
     to avoid INVALID_OPERATION at VertexAttribPointer.
     More clear is GL 4.3 core spec: 10.4 (p 307).

     ES 3.x is not included here.
     Due to it's ES 2.0 backward compatibility it still supports the following features:
            client side vertex arrays
            default vertex array object

     Binding a custom VAO with ES 3.0 would cause client side vertex arrays via glVertexPointer
     to produce GL_INVALID_OPERATION.

     However, they are marked deprecated:
            GL ES 3.0 spec F.1. Legacy Features (p 322).
            GL ES 3.1 spec F.1. Legacy Features (p 454).

If no default VAO is implemented in the native OpenGL profile, an own default VAO is being used, see getDefaultVAO().

See Also:: getDefaultVAO()

getDefaultVAO
```
public abstract int getDefaultVAO()
```
If this GLContext does not implement a default VAO, see hasNoDefaultVAO(), an own default VAO will be created and bound at context creation.
If this GLContext does implement a default VAO, i.e. hasNoDefaultVAO() returns false, this method returns 0.

Otherwise this method returns the VAO object name representing this GLContext's own default VAO.

See Also:
hasNoDefaultVAO()

isGL2
```
public final boolean isGL2()
```
Indicates whether this GLContext is capable of GL2.
Includes [ GL4bc, GL3bc, GL2 ].

See Also:
GLProfile.isGL2()

isGL2GL3
```
public final boolean isGL2GL3()
```
Indicates whether this GLContext is capable of GL2GL3.
Includes [ GL4bc, GL4, GL3bc, GL3, GL2, GL2GL3 ].

See Also:
GLProfile.isGL2GL3()

isGLES1
```
public final boolean isGLES1()
```
Indicates whether this GLContext is capable of GLES1.
Includes [ GLES1 ].

See Also:
GLProfile.isGLES1()

isGLES2
```
public final boolean isGLES2()
```
Indicates whether this GLContext is capable of GLES2.
Includes [ GLES2, GLES3 ].

See Also:
GLProfile.isGLES2()

isGLES3
```
public final boolean isGLES3()
```
Indicates whether this GLContext is capable of GLES3.
Includes [ GLES3 ].

See Also:
GLProfile.isGLES3()

isGLES
```
public final boolean isGLES()
```
Indicates whether this GLContext is capable of GLES.
Includes [ GLES3, GLES1, GLES2 ].

See Also:
GLProfile.isGLES()

isGL2ES1
```
public final boolean isGL2ES1()
```
Indicates whether this GLContext is capable of GL2ES1.
Includes [ GL4bc, GL3bc, GL2, GLES1, GL2ES1 ].

See Also:
GLProfile.isGL2ES1()

isGL2ES2
```
public final boolean isGL2ES2()
```
Indicates whether this GLContext is capable of GL2ES2.
Includes [ GL4bc, GL4, GL3bc, GL3, GLES3, GL2, GL2GL3, GL2ES2, GLES2 ].

See Also:
GLProfile.isGL2ES2()

isGL2ES3
```
public final boolean isGL2ES3()
```
Indicates whether this GLContext is capable of GL2ES3.
Includes [ GL4bc, GL4, GL3bc, GL3, GLES3, GL3ES3, GL2, GL2GL3 ].

See Also:
GLProfile.isGL2ES3(), isGL3ES3(), isGL2GL3()

isGL3ES3
```
public final boolean isGL3ES3()
```
Indicates whether this GLContext is capable of GL3ES3.
Includes [ GL4bc, GL4, GL3bc, GL3, GLES3 ].

See Also:
GLProfile.isGL3ES3()

isGL4ES3
```
public final boolean isGL4ES3()
```
Returns true if this profile is capable of GL4ES3, i.e. if isGLES3Compatible() returns true.
Includes [ GL ≥ 4.3, GL ≥ 3.1 w/ GL_ARB_ES3_compatibility and GLES3 ]

See Also:
GLProfile.isGL4ES3()

setSwapInterval
```
public boolean setSwapInterval(int interval)
                        throws GLException
```
Set the swap interval of the current context and attached onscreen GLDrawable.
offscreen GLDrawable are ignored and false is returned.

The interval semantics:
- 0 disables the vertical synchronization
- ≥1 is the number of vertical refreshes before a swap buffer occurs
- <0 enables late swaps to occur without synchronization to the video frame, a.k.a EXT_swap_control_tear. If supported, the absolute value is the minimum number of video frames between buffer swaps. If not supported, the absolute value is being used, see above.
Parameters:
interval - see above

Returns:
true if the operation was successful, otherwise false

Throws:

GLException - if the context is not current.
See Also:
getSwapInterval()

getSwapInterval
```
public int getSwapInterval()
```
Return the current swap interval.
If the context has not been made current at all, the default value 0 is returned.

For a valid context w/ an onscreen GLDrawable the default value is 1, otherwise the default value is 0.

See Also:
setSwapInterval(int)

queryMaxSwapGroups

public final boolean queryMaxSwapGroups(int[] maxGroups,
                         int maxGroups_offset,
                         int[] maxBarriers,
                         int maxBarriers_offset)

joinSwapGroup

public final boolean joinSwapGroup(int group)

getSwapGroup
```
public int getSwapGroup()
```

bindSwapBarrier

public final boolean bindSwapBarrier(int group,
                      int barrier)

getBoundFramebuffer
```
public abstract int getBoundFramebuffer(int target)
```
Return the framebuffer name bound to this context, see GL.glBindFramebuffer(int, int).
Method is only thread-safe while context is made current.

getDefaultDrawFramebuffer
```
public abstract int getDefaultDrawFramebuffer()
```
Return the default draw framebuffer name.
May differ from it's default zero in case an framebuffer object (FBObject) based drawable is being used.

Method is only thread-safe while context is made current.

getDefaultReadFramebuffer
```
public abstract int getDefaultReadFramebuffer()
```
Return the default read framebuffer name.
May differ from it's default zero in case an framebuffer object (FBObject) based drawable is being used.

Method is only thread-safe while context is made current.

getDefaultReadBuffer
```
public abstract int getDefaultReadBuffer()
```
Returns the default color buffer within the current bound getDefaultReadFramebuffer(), i.e. GL_READ_FRAMEBUFFER, which will be used as the source for pixel reading commands, like glReadPixels etc.
For offscreen framebuffer objects this is GL.GL_COLOR_ATTACHMENT0, otherwise this is GL.GL_FRONT for single buffer configurations and GL.GL_BACK for double buffer configurations.

Note-1: Neither ES1 nor ES2 supports selecting the read buffer via glReadBuffer and GL.GL_BACK is the default.

Note-2: ES3 only supports GL.GL_BACK, GL.GL_NONE or GL.GL_COLOR_ATTACHMENT0+i

Note-3: See swapBuffersBeforeRead for read-pixels and swap-buffers implications.

Method is only thread-safe while context is made current.

getDefaultPixelDataType
```
public abstract int getDefaultPixelDataType()
```
Get the default pixel data type, as required by e.g. GL.glReadPixels(int, int, int, int, int, int, java.nio.Buffer).
Method is only thread-safe while context is made current.

getDefaultPixelDataFormat
```
public abstract int getDefaultPixelDataFormat()
```
Get the default pixel data format, as required by e.g. GL.glReadPixels(int, int, int, int, int, int, java.nio.Buffer).
Method is only thread-safe while context is made current.

getGLDebugMessageExtension
```
public abstract String getGLDebugMessageExtension()
```
Returns:
The extension implementing the GLDebugOutput feature, either GLExtensions.ARB_debug_output or GLExtensions.AMD_debug_output. If unavailable or called before initialized via makeCurrent(), null is returned.

isGLDebugSynchronous
```
public abstract boolean isGLDebugSynchronous()
```
Returns:
the current synchronous debug behavior, set via setGLDebugSynchronous(boolean).

setGLDebugSynchronous
```
public abstract void setGLDebugSynchronous(boolean synchronous)
```
Enables or disables the synchronous debug behavior via glEnable/glDisable(GL_DEBUG_OUTPUT_SYNCHRONOUS), if extension is GLExtensions.ARB_debug_output. There is no equivalent for GLExtensions.AMD_debug_output.
The default is true, ie GL2ES2.GL_DEBUG_OUTPUT_SYNCHRONOUS.

isGLDebugMessageEnabled
```
public abstract boolean isGLDebugMessageEnabled()
```
Returns:
true if the GLDebugOutput feature is enabled or not.

enableGLDebugMessage
```
public abstract void enableGLDebugMessage(boolean enable)
                                   throws GLException
```
Enables or disables the GLDebugOutput feature of extension GLExtensions.ARB_debug_output or GLExtensions.AMD_debug_output, if available.
To enable the GLDebugOutput feature enableGLDebugMessage(true) or setContextCreationFlags(CTX_OPTION_DEBUG) shall be called before context creation via makeCurrent()!

In case GLAutoDrawable are being used, glAutoDrawable.setContextCreationFlags(CTX_OPTION_DEBUG) shall be issued before context creation via makeCurrent()!

After context creation, the GLDebugOutput feature may be enabled or disabled at any time using this method.

Parameters:
enable - If true enables, otherwise disables the GLDebugOutput feature.

Throws:

GLException - if this context is not current or GLDebugOutput registration failed (enable)
See Also:
setContextCreationFlags(int), addGLDebugListener(GLDebugListener), GLAutoDrawable.setContextCreationFlags(int)

addGLDebugListener
```
public abstract void addGLDebugListener(GLDebugListener listener)
```
Add GLDebugListener.

Parameters:
listener - GLDebugListener handling GLDebugMessages
See Also:
enableGLDebugMessage(boolean), removeGLDebugListener(GLDebugListener)

removeGLDebugListener
```
public abstract void removeGLDebugListener(GLDebugListener listener)
```
Remove GLDebugListener.

Parameters:
listener - GLDebugListener handling GLDebugMessages
See Also:
enableGLDebugMessage(boolean), addGLDebugListener(GLDebugListener)

glDebugMessageControl

public abstract void glDebugMessageControl(int source,
                         int type,
                         int severity,
                         int count,
                         IntBuffer ids,
                         boolean enabled)

Generic entry for GL2ES2.glDebugMessageControl(int, int, int, int, IntBuffer, boolean) and GL2GL3.glDebugMessageEnableAMD(int, int, int, IntBuffer, boolean) of the GLDebugOutput feature.

See Also:: enableGLDebugMessage(boolean)

glDebugMessageControl

public abstract void glDebugMessageControl(int source,
                         int type,
                         int severity,
                         int count,
                         int[] ids,
                         int ids_offset,
                         boolean enabled)

Generic entry for GL2ES2.glDebugMessageControl(int, int, int, int, int[], int, boolean) and GL2GL3.glDebugMessageEnableAMD(int, int, int, int[], int, boolean) of the GLDebugOutput feature.

See Also:: enableGLDebugMessage(boolean)

glDebugMessageInsert

public abstract void glDebugMessageInsert(int source,
                        int type,
                        int id,
                        int severity,
                        String buf)

Generic entry for GL2ES2.glDebugMessageInsert(int, int, int, int, int, String) and GL2GL3.glDebugMessageInsertAMD(int, int, int, int, String) of the GLDebugOutput feature.

See Also:: enableGLDebugMessage(boolean)

getMaxMajor

public static final int getMaxMajor(int ctxProfile)

getMaxMinor

public static final int getMaxMinor(int ctxProfile,
              int major)

isValidGLVersion
```
public static final boolean isValidGLVersion(int ctxProfile,
                       int major,
                       int minor)
```
Returns true, if the major.minor is not inferior to the lowest valid version and does not exceed the highest known major number by more than one.
The minor version number is ignored by the upper limit validation and the major version number may exceed by one.

The upper limit check is relaxed since we don't want to cut-off unforseen new GL version since the release of JOGL.

Hence it is important to iterate through GL version from the upper limit and decrementGLVersion(int, int[], int[]) until invalid.

clipGLVersion
```
public static final boolean clipGLVersion(int ctxProfile,
                    int[] major,
                    int[] minor)
```
Clip the given GL version to the maximum known valid version if exceeding.

Returns:
true if clipped, i.e. given value exceeds maximum, otherwise false.

decrementGLVersion
```
public static final boolean decrementGLVersion(int ctxProfile,
                         int[] major,
                         int[] minor)
```
Decrement the given GL version by one and return true if still valid, otherwise false.
If the given version exceeds the maximum known valid version, it is clipped and true is returned.

Parameters:
ctxProfile -
major -
minor -

Returns:

isFBOAvailable
```
public static final boolean isFBOAvailable(AbstractGraphicsDevice device,
                     GLProfile glp)
```
Returns true if it is possible to create an framebuffer object (FBO).
FBO feature is implemented in OpenGL, hence it is GLProfile dependent.

FBO support is queried as described in hasBasicFBOSupport().

Parameters:
device - the device to request whether FBO is available for
glp - GLProfile to check for FBO capabilities
See Also:
hasBasicFBOSupport()

isHardwareRasterizer
```
public static final int isHardwareRasterizer(AbstractGraphicsDevice device,
                       GLProfile glp)
```
Returns:
1 if using a hardware rasterizer, 0 if using a software rasterizer and -1 if not determined yet.
See Also:
isHardwareRasterizer(), GLProfile.isHardwareRasterizer()

isGLES1Available

public static boolean isGLES1Available(AbstractGraphicsDevice device,
                       boolean[] isHardware)

isGLES2Available

public static boolean isGLES2Available(AbstractGraphicsDevice device,
                       boolean[] isHardware)

isGLES3Available

public static boolean isGLES3Available(AbstractGraphicsDevice device,
                       boolean[] isHardware)

isGLES3CompatibleAvailable
```
public static final boolean isGLES3CompatibleAvailable(AbstractGraphicsDevice device)
```
Returns true if a ES3 compatible profile is available, i.e. either a ≥ 4.3 context or a ≥ 3.1 context supporting GL_ARB_ES3_compatibility, otherwise false.
Includes [ GL ≥ 4.3, GL ≥ 3.1 w/ GL_ARB_ES3_compatibility and GLES3 ]

isGLES31CompatibleAvailable
```
public static final boolean isGLES31CompatibleAvailable(AbstractGraphicsDevice device)
```
Returns true if a ES3 ≥ 3.1 compatible profile is available, i.e. either a ≥ 4.5 context or a ≥ 3.1 context supporting GL_ARB_ES3_1_compatibility, otherwise false.
Includes [ GL ≥ 4.5, GL ≥ 3.1 w/ GL_ARB_ES3_1_compatibility and GLES3 ≥ 3.1 ]

isGLES32CompatibleAvailable
```
public static final boolean isGLES32CompatibleAvailable(AbstractGraphicsDevice device)
```
Returns true if a ES3 ≥ 3.2 compatible profile is available, i.e. either a ≥ 4.5 context or a ≥ 3.1 context supporting GL_ARB_ES3_2_compatibility, otherwise false.
Includes [ GL ≥ 4.5, GL ≥ 3.1 w/ GL_ARB_ES3_2_compatibility and GLES3 ≥ 3.2 ]

isGL4bcAvailable

public static boolean isGL4bcAvailable(AbstractGraphicsDevice device,
                       boolean[] isHardware)

isGL4Available

public static boolean isGL4Available(AbstractGraphicsDevice device,
                     boolean[] isHardware)

isGL3bcAvailable

public static boolean isGL3bcAvailable(AbstractGraphicsDevice device,
                       boolean[] isHardware)

isGL3Available

public static boolean isGL3Available(AbstractGraphicsDevice device,
                     boolean[] isHardware)

isGL2Available

public static boolean isGL2Available(AbstractGraphicsDevice device,
                     boolean[] isHardware)

Class GLContext

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEBUG

TRACE_SWITCH

DEBUG_TRACE_SWITCH

PROFILE_ALIASING

DEBUG_GL

TRACE_GL

CONTEXT_NOT_CURRENT

CONTEXT_CURRENT

CONTEXT_CURRENT_NEW

Version1_0

Version1_10

Version1_20

Version1_30

Version1_40

Version1_50

Version1_1

Version1_2

Version1_4

Version1_5

Version3_0

Version3_1

Version3_2

Version4_3

CTX_OPTION_DEBUG

GL_VERSIONS

ES_VERSIONS

Method Detail

isShared

getSharedMaster

getCreatedShares

getDestroyedShares

getRendererQuirks

hasRendererQuirk

setGLDrawable

getGLDrawable

isGLReadDrawableAvailable

setGLReadDrawable

getGLReadDrawable

makeCurrent

release

copy

getCurrentGL

getCurrent

isCurrent

validateCurrent

makeCurrentResultToString

destroy

getRootGL

getGL

setGL

getHandle

isCreated

getAttachedObject

attachObject

detachObject

toString

append

isFunctionAvailable

isExtensionAvailable

getPlatformExtensionCount

getPlatformExtensionsString

getGLExtensionCount

getGLExtensionsString

getContextCreationFlags

setContextCreationFlags

getGLVersion

getGLVersionNumber

getGLVendorVersionNumber

isGLCompatibilityProfile

isGLCoreProfile

isGLESProfile

isGLForwardCompatible

isGLDebugEnabled

isCreatedWithARBMethod

getGLSLVersionNumber