glgeterror(3g) [xfree86 man page]

GLGETERROR(3G)															    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_STACK_OVERFLOW	     This command would cause a stack overflow.  The offending command is ignored, and has no  other  side  effect
				     than to set the error flag.

       GL_STACK_UNDERFLOW	     This  command  would cause a stack underflow.  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_TABLE_TOO_LARGE	     The  specified  table  exceeds  the  implementation's maximum supported table size.  The offending command is
				     ignored, and has no other side effect than to set the error flag.

       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.

NOTES

       GL_TABLE_TOO_LARGE was introduced in GL version 1.2.

ERRORS

       GL_INVALID_OPERATION is generated if glGetError is executed between the execution of glBegin and the corresponding execution of glEnd.	In
       this case glGetError returns 0.

																    GLGETERROR(3G)

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GLPUSHCLIENTATTRIB(3G)													    GLPUSHCLIENTATTRIB(3G)

NAME

       glPushClientAttrib, glPopClientAttrib - push and pop the client attribute stack

C SPECIFICATION

       void glPushClientAttrib( GLbitfield mask);  1.1 )

PARAMETERS

       1.1  Specifies a mask that indicates which attributes to save.  Values for 1.1 are listed below.

C SPECIFICATION

       void glPopClientAttrib( void);  1.1 )

DESCRIPTION

       glPushClientAttrib  takes one argument, a mask that indicates which groups of client-state variables to save on the client attribute stack.
       Symbolic constants are used to set bits in the mask.  1.1 is typically constructed by OR'ing several of these constants together.  The spe-
       cial mask GL_CLIENT_ALL_ATTRIB_BITS can be used to save all stackable client state.

       The symbolic mask constants and their associated GL client state are as follows (the second column lists which attributes are saved):

       GL_CLIENT_PIXEL_STORE_BIT     Pixel storage modes
       GL_CLIENT_VERTEX_ARRAY_BIT    Vertex arrays (and enables)

       glPopClientAttrib  restores  the  values  of  the  client-state variables saved with the last glPushClientAttrib.  Those not saved are left
       unchanged.

       It is an error to push attributes onto a full client attribute stack, or to pop attributes off an empty stack.  In either case,	the  error
       flag is set, and no other change is made to GL state.

       Initially, the client attribute stack is empty.

NOTES

       glPushClientAttrib is available only if the GL version is 1.1 or greater.

       Not all values for GL client state can be saved on the attribute stack.	For example, select and feedback state cannot be saved.

       The depth of the attribute stack depends on the implementation, but it must be at least 16.

       Use glPushAttrib and glPopAttrib to push and restore state which is kept on the server. Only pixel storage modes and vertex array state may
       be pushed and popped with glPushClientAttrib and glPopClientAttrib.

       When the GL_ARB_multitexture extension is supported, pushing and popping client vertex array state apples to all supported  texture  units,
       and the active client texture state.

ERRORS

       GL_STACK_OVERFLOW is generated if glPushClientAttrib is called while the attribute stack is full.

       GL_STACK_UNDERFLOW is generated if glPopClientAttrib is called while the attribute stack is empty.

ASSOCIATED GETS

       glGet with argument GL_ATTRIB_STACK_DEPTH
       glGet with argument GL_MAX_CLIENT_ATTRIB_STACK_DEPTH

SEE ALSO

       glColorPointer(3G),     glDisableClientState(3G),     glEdgeFlagPointer(3G),	glEnableClientState(3G),     glGet(3G),    glGetError(3G),
       glIndexPointer(3G), glNormalPointer(3G), glNewList(3G), glPixelStore(3G), glPushAttrib(3G), glTexCoordPointer(3G), glVertexPointer(3G)

															    GLPUSHCLIENTATTRIB(3G)

Linux and UNIX Man Pages

glgeterror(3g) [xfree86 man page]

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