Class KHRDebug



  • public class KHRDebug
    extends java.lang.Object
    Native bindings to the KHR_debug extension.

    This extension allows the GL to notify applications when various events occur that may be useful during application development, debugging and profiling.

    These events are represented in the form of enumerable messages with a human-readable string representation. Examples of debug events include incorrect use of the GL, warnings of undefined behavior, and performance warnings.

    A message is uniquely identified by a source, a type and an implementation-dependent ID within the source and type pair.

    A message's source identifies the origin of the message and can either describe components of the GL, the window system, third-party external sources such as external debuggers, or even the application itself.

    The type of the message roughly identifies the nature of the event that caused the message. Examples include errors, performance warnings, warnings about undefined behavior or notifications identifying that the application is within a specific section of the application code.

    A message's ID for a given source and type further distinguishes messages within namespaces. For example, an error caused by a negative parameter value or an invalid internal texture format are both errors generated by the API, but would likely have different message IDs.

    Each message is also assigned to a severity level that denotes roughly how "important" that message is in comparison to other messages across all sources and types. For example, notification of a GL error would likely have a higher severity than a performance warning due to redundant state changes.

    Furthermore, every message contains an implementation-dependent string representation that provides a useful description of the event.

    Messages are communicated to the application through an application-defined callback function that is called by the GL implementation on each debug message. The motivation for the callback routine is to free application developers from actively having to query whether a GL error, or any other debuggable event has happened after each call to a GL function. With a callback, developers can keep their code free of debug checks, set breakpoints in the callback function, and only have to react to messages as they occur. In situations where using a callback is not possible, a message log is also provided that stores only copies of recent messages until they are actively queried.

    To control the volume of debug output, messages can be disabled either individually by ID, or entire sets of messages can be turned off based on combination of source and type, through the entire application code or only section of the code encapsulated in debug groups. A debug group may also be used to annotate the command stream using descriptive texts.

    This extension also defines debug markers, a mechanism for the OpenGL application to annotate the command stream with markers for discrete events.

    When profiling or debugging an OpenGL application with a built-in or an external debugger or profiler, it is difficult to relate the commands within the command stream to the elements of the scene or parts of the program code to which they correspond. Debug markers and debug groups help obviate this by allowing applications to specify this link. For example, a debug marker can be used to identify the beginning of a frame in the command stream and a debug group can encapsulate a specific command stream to identify a rendering pass. Debug groups also allow control of the debug outputs volume per section of an application code providing an effective way to handle the massive amount of debug outputs that drivers can generate.

    Some existing implementations of ARB_debug_output only expose the ARB_debug_output extension string if the context was created with the debug flag {GLX|WGL}_CONTEXT_DEBUG_BIT_ARB as specified in {GLX|WGL}_ARB_create_context. The behavior is not obvious when the functionality is brought into the OpenGL core specification because the extension string and function entry points must always exist.

    This extension modifies the existing ARB_debug_output extension to allow implementations to always have an empty message log. The specific messages written to the message log or callback routines are already implementation defined, so this specification simply makes it explicit that it's fine for there to be zero messages generated, even when a GL error occurs, which is useful if the context is non-debug.

    Debug output can be enabled and disabled by changing the DEBUG_OUTPUT_KHR state.

    Finally, this extension defines a mechanism for OpenGL applications to label their objects (textures, buffers, shaders, etc.) with a descriptive string.

    When profiling or debugging an OpenGL application within an external or built-in (debut output API) debugger or profiler it is difficult to identify objects from their object names (integers).

    Even when the object itself is viewed it can be problematic to differentiate between similar objects. Attaching a descriptive string, a label, to an object obviates this difficulty.

    The intended purpose of this extension is purely to improve the user experience within OpenGL development tools and application built-in profilers and debuggers. This extension typically improves OpenGL programmers efficiency by allowing them to instantly detect issues and the reason for these issues giving him more time to focus on adding new features to an OpenGL application.

    • Field Detail

      • GL_DEBUG_OUTPUT_KHR

        public static final int GL_DEBUG_OUTPUT_KHR
        Tokens accepted by the target parameters of Enable, Disable, and IsEnabled.
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      • GL_DEBUG_OUTPUT_SYNCHRONOUS_KHR

        public static final int GL_DEBUG_OUTPUT_SYNCHRONOUS_KHR
        Tokens accepted by the target parameters of Enable, Disable, and IsEnabled.
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      • GL_CONTEXT_FLAG_DEBUG_BIT_KHR

        public static final int GL_CONTEXT_FLAG_DEBUG_BIT_KHR
        Returned by GetIntegerv when pname is CONTEXT_FLAGS.
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      • GL_MAX_DEBUG_MESSAGE_LENGTH_KHR

        public static final int GL_MAX_DEBUG_MESSAGE_LENGTH_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_MAX_DEBUG_LOGGED_MESSAGES_KHR

        public static final int GL_MAX_DEBUG_LOGGED_MESSAGES_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_DEBUG_LOGGED_MESSAGES_KHR

        public static final int GL_DEBUG_LOGGED_MESSAGES_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_KHR

        public static final int GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_MAX_DEBUG_GROUP_STACK_DEPTH_KHR

        public static final int GL_MAX_DEBUG_GROUP_STACK_DEPTH_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_DEBUG_GROUP_STACK_DEPTH_KHR

        public static final int GL_DEBUG_GROUP_STACK_DEPTH_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_MAX_LABEL_LENGTH_KHR

        public static final int GL_MAX_LABEL_LENGTH_KHR
        Tokens accepted by the value parameters of GetBooleanv, GetIntegerv, GetFloatv, GetDoublev and GetInteger64v.
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      • GL_DEBUG_CALLBACK_FUNCTION_KHR

        public static final int GL_DEBUG_CALLBACK_FUNCTION_KHR
        Tokens accepted by the pname parameter of GetPointerv.
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      • GL_DEBUG_CALLBACK_USER_PARAM_KHR

        public static final int GL_DEBUG_CALLBACK_USER_PARAM_KHR
        Tokens accepted by the pname parameter of GetPointerv.
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      • GL_DEBUG_SOURCE_API_KHR

        public static final int GL_DEBUG_SOURCE_API_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_SOURCE_WINDOW_SYSTEM_KHR

        public static final int GL_DEBUG_SOURCE_WINDOW_SYSTEM_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_SOURCE_SHADER_COMPILER_KHR

        public static final int GL_DEBUG_SOURCE_SHADER_COMPILER_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_SOURCE_THIRD_PARTY_KHR

        public static final int GL_DEBUG_SOURCE_THIRD_PARTY_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_SOURCE_APPLICATION_KHR

        public static final int GL_DEBUG_SOURCE_APPLICATION_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_SOURCE_OTHER_KHR

        public static final int GL_DEBUG_SOURCE_OTHER_KHR
        Tokens accepted or provided by the source parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the sources parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_ERROR_KHR

        public static final int GL_DEBUG_TYPE_ERROR_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_KHR

        public static final int GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_KHR

        public static final int GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_PORTABILITY_KHR

        public static final int GL_DEBUG_TYPE_PORTABILITY_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_PERFORMANCE_KHR

        public static final int GL_DEBUG_TYPE_PERFORMANCE_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_OTHER_KHR

        public static final int GL_DEBUG_TYPE_OTHER_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_MARKER_KHR

        public static final int GL_DEBUG_TYPE_MARKER_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_PUSH_GROUP_KHR

        public static final int GL_DEBUG_TYPE_PUSH_GROUP_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_TYPE_POP_GROUP_KHR

        public static final int GL_DEBUG_TYPE_POP_GROUP_KHR
        Tokens accepted or provided by the type parameters of DebugMessageControl and DEBUGPROC, and the types parameter of GetDebugMessageLog.
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      • GL_DEBUG_SEVERITY_HIGH_KHR

        public static final int GL_DEBUG_SEVERITY_HIGH_KHR
        Tokens accepted or provided by the severity parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC callback functions, and the severities parameter of GetDebugMessageLog.
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      • GL_DEBUG_SEVERITY_MEDIUM_KHR

        public static final int GL_DEBUG_SEVERITY_MEDIUM_KHR
        Tokens accepted or provided by the severity parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC callback functions, and the severities parameter of GetDebugMessageLog.
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      • GL_DEBUG_SEVERITY_LOW_KHR

        public static final int GL_DEBUG_SEVERITY_LOW_KHR
        Tokens accepted or provided by the severity parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC callback functions, and the severities parameter of GetDebugMessageLog.
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      • GL_DEBUG_SEVERITY_NOTIFICATION_KHR

        public static final int GL_DEBUG_SEVERITY_NOTIFICATION_KHR
        Tokens accepted or provided by the severity parameters of DebugMessageControl, DebugMessageInsert and DEBUGPROC callback functions, and the severities parameter of GetDebugMessageLog.
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      • GL_STACK_UNDERFLOW_KHR

        public static final int GL_STACK_UNDERFLOW_KHR
        Returned by GetError.
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      • GL_STACK_OVERFLOW_KHR

        public static final int GL_STACK_OVERFLOW_KHR
        Returned by GetError.
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      • GL_BUFFER_KHR

        public static final int GL_BUFFER_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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      • GL_SHADER_KHR

        public static final int GL_SHADER_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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      • GL_PROGRAM_KHR

        public static final int GL_PROGRAM_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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      • GL_QUERY_KHR

        public static final int GL_QUERY_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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      • GL_PROGRAM_PIPELINE_KHR

        public static final int GL_PROGRAM_PIPELINE_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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      • GL_SAMPLER_KHR

        public static final int GL_SAMPLER_KHR
        Tokens accepted or provided by the identifier parameters of ObjectLabel and GetObjectLabel.
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    • Method Detail

      • glDebugMessageCallbackKHR

        public static void glDebugMessageCallbackKHR(GLDebugMessageKHRCallbackI callback,
                                                     long userParam)
        Specifies a callback to receive debugging messages from the GL.

        The function's prototype must follow the type definition of DEBUGPROC including its platform-dependent calling convention. Anything else will result in undefined behavior. Only one debug callback can be specified for the current context, and further calls overwrite the previous callback. Specifying NULL as the value of callback clears the current callback and disables message output through callbacks. Applications can provide user-specified data through the pointer userParam. The context will store this pointer and will include it as one of the parameters in each call to the callback function.

        If the application has specified a callback function for receiving debug output, the implementation will call that function whenever any enabled message is generated. The source, type, ID, and severity of the message are specified by the DEBUGPROC parameters source, type, id, and severity, respectively. The string representation of the message is stored in message and its length (excluding the null-terminator) is stored in length. The parameter userParam is the user-specified parameter that was given when calling DebugMessageCallback.

        Applications can query the current callback function and the current user-specified parameter by obtaining the values of DEBUG_CALLBACK_FUNCTION_KHR and DEBUG_CALLBACK_USER_PARAM_KHR, respectively.

        Applications that specify a callback function must be aware of certain special conditions when executing code inside a callback when it is called by the GL, regardless of the debug source.

        The memory for message is owned and managed by the GL, and should only be considered valid for the duration of the function call.

        The behavior of calling any GL or window system function from within the callback function is undefined and may lead to program termination.

        Care must also be taken in securing debug callbacks for use with asynchronous debug output by multi-threaded GL implementations.

        If the DEBUG_OUTPUT_KHR state is disabled then the GL will not call the callback function.

        Parameters:
        callback - a callback function that will be called when a debug message is generated
        userParam - a user supplied pointer that will be passed on each invocation of callback
      • glGetDebugMessageLogKHR

        public static int glGetDebugMessageLogKHR(int count,
                                                  java.nio.IntBuffer sources,
                                                  java.nio.IntBuffer types,
                                                  java.nio.IntBuffer ids,
                                                  java.nio.IntBuffer severities,
                                                  java.nio.IntBuffer lengths,
                                                  java.nio.ByteBuffer messageLog)
        Retrieves messages from the debug message log.

        This function fetches a maximum of count messages from the message log, and will return the number of messages successfully fetched.

        Messages will be fetched from the log in order of oldest to newest. Those messages that were fetched will be removed from the log.

        The sources, types, severities, IDs, and string lengths of fetched messages will be stored in the application-provided arrays sources, types, severities, ids, and lengths, respectively. The application is responsible for allocating enough space for each array to hold up to count elements. The string representations of all fetched messages are stored in the messageLog array. If multiple messages are fetched, their strings are concatenated into the same messageLog array and will be separated by single null terminators. The last string in the array will also be null-terminated. The maximum size of messageLog, including the space used by all null terminators, is given by bufSize. If bufSize is less than zero and messageLog is not NULL, an INVALID_VALUE error will be generated. If a message's string, including its null terminator, can not fully fit within the messageLog array's remaining space, then that message and any subsequent messages will not be fetched and will remain in the log. The string lengths stored in the array lengths include the space for the null terminator of each string.

        Any or all of the arrays sources, types, ids, severities, lengths and messageLog can also be null pointers, which causes the attributes for such arrays to be discarded when messages are fetched, however those messages will still be removed from the log. Thus to simply delete up to count messages from the message log while ignoring their attributes, the application can call the function with null pointers for all attribute arrays.

        If the context was created without the CONTEXT_FLAG_DEBUG_BIT_KHR, then the GL can opt to never add messages to the message log so GetDebugMessageLog will always return zero.

        Parameters:
        count - the number of debug messages to retrieve from the log
        sources - an array of variables to receive the sources of the retrieved messages
        types - an array of variables to receive the types of the retrieved messages
        ids - an array of unsigned integers to receive the ids of the retrieved messages
        severities - an array of variables to receive the severites of the retrieved messages
        lengths - an array of variables to receive the lengths of the received messages
        messageLog - an array of characters that will receive the messages
      • glGetPointervKHR

        public static void glGetPointervKHR(int pname,
                                            PointerBuffer params)
      • glGetPointerKHR

        public static long glGetPointerKHR(int pname)
      • glPushDebugGroupKHR

        public static void glPushDebugGroupKHR(int source,
                                               int id,
                                               java.nio.ByteBuffer message)
        Pushes a debug group described by the string message into the command stream. The value of id specifies the ID of messages generated. The parameter length contains the number of characters in message. If length is negative, it is implied that message contains a null terminated string. The message has the specified source and id, type DEBUG_TYPE_PUSH_GROUP_KHR, and severity DEBUG_SEVERITY_NOTIFICATION_KHR. The GL will put a new debug group on top of the debug group stack which inherits the control of the volume of debug output of the debug group previously residing on the top of the debug group stack. Because debug groups are strictly hierarchical, any additional control of the debug output volume will only apply within the active debug group and the debug groups pushed on top of the active debug group.

        An INVALID_ENUM error is generated if the value of source is neither DEBUG_SOURCE_APPLICATION_KHR nor DEBUG_SOURCE_THIRD_PARTY_KHR. An INVALID_VALUE error is generated if length is negative and the number of characters in message, excluding the null-terminator, is not less than the value of MAX_DEBUG_MESSAGE_LENGTH_KHR.

        Parameters:
        source - the source of the debug message. One of:
        DEBUG_SOURCE_APPLICATION_KHRDEBUG_SOURCE_THIRD_PARTY_KHR
        id - the identifier of the message
        message - a string containing the message to be sent to the debug output stream
      • glPushDebugGroupKHR

        public static void glPushDebugGroupKHR(int source,
                                               int id,
                                               java.lang.CharSequence message)
        Pushes a debug group described by the string message into the command stream. The value of id specifies the ID of messages generated. The parameter length contains the number of characters in message. If length is negative, it is implied that message contains a null terminated string. The message has the specified source and id, type DEBUG_TYPE_PUSH_GROUP_KHR, and severity DEBUG_SEVERITY_NOTIFICATION_KHR. The GL will put a new debug group on top of the debug group stack which inherits the control of the volume of debug output of the debug group previously residing on the top of the debug group stack. Because debug groups are strictly hierarchical, any additional control of the debug output volume will only apply within the active debug group and the debug groups pushed on top of the active debug group.

        An INVALID_ENUM error is generated if the value of source is neither DEBUG_SOURCE_APPLICATION_KHR nor DEBUG_SOURCE_THIRD_PARTY_KHR. An INVALID_VALUE error is generated if length is negative and the number of characters in message, excluding the null-terminator, is not less than the value of MAX_DEBUG_MESSAGE_LENGTH_KHR.

        Parameters:
        source - the source of the debug message. One of:
        DEBUG_SOURCE_APPLICATION_KHRDEBUG_SOURCE_THIRD_PARTY_KHR
        id - the identifier of the message
        message - a string containing the message to be sent to the debug output stream
      • glGetObjectLabelKHR

        public static void glGetObjectLabelKHR(int identifier,
                                               int name,
                                               java.nio.IntBuffer length,
                                               java.nio.ByteBuffer label)
        Retrieves the label of a named object identified within a namespace.
        Parameters:
        identifier - the namespace from which the name of the object is allocated. One of:
        BUFFER_KHRSHADER_KHRPROGRAM_KHRQUERY_KHRPROGRAM_PIPELINE_KHRSAMPLER_KHR
        TEXTURERENDERBUFFERFRAMEBUFFERTRANSFORM_FEEDBACK
        name - the name of the object whose label to retrieve
        length - the address of a variable to receive the length of the object label
        label - a string that will receive the object label
      • glObjectPtrLabelKHR

        public static void glObjectPtrLabelKHR(long ptr,
                                               java.nio.ByteBuffer label)
        Labels a sync object identified by a pointer.
        Parameters:
        ptr - a pointer identifying a sync object
        label - a string containing the label to assign to the object
      • glObjectPtrLabelKHR

        public static void glObjectPtrLabelKHR(long ptr,
                                               java.lang.CharSequence label)
        Labels a sync object identified by a pointer.
        Parameters:
        ptr - a pointer identifying a sync object
        label - a string containing the label to assign to the object
      • glGetObjectPtrLabelKHR

        public static void glGetObjectPtrLabelKHR(long ptr,
                                                  java.nio.IntBuffer length,
                                                  java.nio.ByteBuffer label)
        Retrieves the label of a sync object identified by a pointer.
        Parameters:
        ptr - the name of the sync object whose label to retrieve
        length - a variable to receive the length of the object label
        label - a string that will receive the object label
      • glGetObjectPtrLabelKHR

        public static java.lang.String glGetObjectPtrLabelKHR(long ptr,
                                                              int bufSize)
        Retrieves the label of a sync object identified by a pointer.
        Parameters:
        ptr - the name of the sync object whose label to retrieve
        bufSize - the length of the buffer whose address is in label
      • glGetObjectPtrLabelKHR

        public static java.lang.String glGetObjectPtrLabelKHR(long ptr)
        Retrieves the label of a sync object identified by a pointer.
        Parameters:
        ptr - the name of the sync object whose label to retrieve
      • glDebugMessageControlKHR

        public static void glDebugMessageControlKHR(int source,
                                                    int type,
                                                    int severity,
                                                    int[] ids,
                                                    boolean enabled)
        Array version of: DebugMessageControlKHR
      • glGetDebugMessageLogKHR

        public static int glGetDebugMessageLogKHR(int count,
                                                  int[] sources,
                                                  int[] types,
                                                  int[] ids,
                                                  int[] severities,
                                                  int[] lengths,
                                                  java.nio.ByteBuffer messageLog)
        Array version of: GetDebugMessageLogKHR
      • glGetObjectLabelKHR

        public static void glGetObjectLabelKHR(int identifier,
                                               int name,
                                               int[] length,
                                               java.nio.ByteBuffer label)
        Array version of: GetObjectLabelKHR
      • glGetObjectPtrLabelKHR

        public static void glGetObjectPtrLabelKHR(long ptr,
                                                  int[] length,
                                                  java.nio.ByteBuffer label)
        Array version of: GetObjectPtrLabelKHR