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glgeterror(3g) [centos man page]

GLGETERROR(3G)							   OpenGL Manual						    GLGETERROR(3G)

NAME

       glGetError - return error information

C SPECIFICATION

       GLenum glGetError(void);

DESCRIPTION

       glGetError returns the value of the error flag. Each detectable error is assigned a numeric code and symbolic name. When an error occurs,
       the error flag is set to the appropriate error code value. No other errors are recorded until glGetError is called, the error code is
       returned, and the flag is reset to GL_NO_ERROR. If a call to glGetError returns GL_NO_ERROR, there has been no detectable error since the
       last call to glGetError, or since the GL was initialized.

       To allow for distributed implementations, there may be several error flags. If any single error flag has recorded an error, the value of
       that flag is returned and that flag is reset to GL_NO_ERROR when glGetError is called. If more than one flag has recorded an error,
       glGetError returns and clears an arbitrary error flag value. Thus, glGetError should always be called in a loop, until it returns
       GL_NO_ERROR, if all error flags are to be reset.

       Initially, all error flags are set to GL_NO_ERROR.

       The following errors are currently defined:

       GL_NO_ERROR
	   No error has been recorded. The value of this symbolic constant is guaranteed to be 0.

       GL_INVALID_ENUM
	   An unacceptable value is specified for an enumerated argument. The offending command is ignored and has no other side effect than to
	   set the error flag.

       GL_INVALID_VALUE
	   A numeric argument is out of range. The offending command is ignored and has no other side effect than to set the error flag.

       GL_INVALID_OPERATION
	   The specified operation is not allowed in the current state. The offending command is ignored and has no other side effect than to set
	   the error flag.

       GL_INVALID_FRAMEBUFFER_OPERATION
	   The framebuffer object is not complete. The offending command is ignored and has no other side effect than to set the error flag.

       GL_OUT_OF_MEMORY
	   There is not enough memory left to execute the command. The state of the GL is undefined, except for the state of the error flags,
	   after this error is recorded.

       GL_STACK_UNDERFLOW
	   An attempt has been made to perform an operation that would cause an internal stack to underflow.

       GL_STACK_OVERFLOW
	   An attempt has been made to perform an operation that would cause an internal stack to overflow.

       When an error flag is set, results of a GL operation are undefined only if GL_OUT_OF_MEMORY has occurred. In all other cases, the command
       generating the error is ignored and has no effect on the GL state or frame buffer contents. If the generating command returns a value, it
       returns 0. If glGetError itself generates an error, it returns 0.

COPYRIGHT

       Copyright (C) 1991-2006 Silicon Graphics, Inc. Copyright (C) 2012 Khronos Group. This document is licensed under the SGI Free Software B
       License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014							    GLGETERROR(3G)

Check Out this Related Man Page

GLPUSHNAME(3G)							   OpenGL Manual						    GLPUSHNAME(3G)

NAME

       glPushName - push and pop the name stack

C SPECIFICATION

       void glPushName(GLuint name);

PARAMETERS

       name
	   Specifies a name that will be pushed onto the name stack.

C SPECIFICATION

       void glPopName(void);

DESCRIPTION

       The name stack is used during selection mode to allow sets of rendering commands to be uniquely identified. It consists of an ordered set
       of unsigned integers and is initially empty.

       glPushName causes name to be pushed onto the name stack.  glPopName() pops one name off the top of the stack.

       The maximum name stack depth is implementation-dependent; call GL_MAX_NAME_STACK_DEPTH to find out the value for a particular
       implementation. It is an error to push a name onto a full stack or to pop a name off an empty stack. It is also an error to manipulate the
       name stack between the execution of glBegin() and the corresponding execution of glEnd(). In any of these cases, the error flag is set and
       no other change is made to GL state.

       The name stack is always empty while the render mode is not GL_SELECT. Calls to glPushName or glPopName() while the render mode is not
       GL_SELECT are ignored.

ERRORS

       GL_STACK_OVERFLOW is generated if glPushName is called while the name stack is full.

       GL_STACK_UNDERFLOW is generated if glPopName() is called while the name stack is empty.

       GL_INVALID_OPERATION is generated if glPushName or glPopName() is executed between a call to glBegin() and the corresponding call to
       glEnd().

ASSOCIATED GETS

       glGet() with argument GL_NAME_STACK_DEPTH

       glGet() with argument GL_MAX_NAME_STACK_DEPTH

SEE ALSO

       glInitNames(), glLoadName(), glRenderMode(), glSelectBuffer()

COPYRIGHT

       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014							    GLPUSHNAME(3G)
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