1GLGETERROR(3G)                   OpenGL Manual                  GLGETERROR(3G)
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NAME

6       glGetError - return error information
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C SPECIFICATION

9       GLenum glGetError(void);
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DESCRIPTION

12       glGetError returns the value of the error flag. Each detectable error
13       is assigned a numeric code and symbolic name. When an error occurs, the
14       error flag is set to the appropriate error code value. No other errors
15       are recorded until glGetError is called, the error code is returned,
16       and the flag is reset to GL_NO_ERROR. If a call to glGetError returns
17       GL_NO_ERROR, there has been no detectable error since the last call to
18       glGetError, or since the GL was initialized.
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20       To allow for distributed implementations, there may be several error
21       flags. If any single error flag has recorded an error, the value of
22       that flag is returned and that flag is reset to GL_NO_ERROR when
23       glGetError is called. If more than one flag has recorded an error,
24       glGetError returns and clears an arbitrary error flag value. Thus,
25       glGetError should always be called in a loop, until it returns
26       GL_NO_ERROR, if all error flags are to be reset.
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28       Initially, all error flags are set to GL_NO_ERROR.
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30       The following errors are currently defined:
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32       GL_NO_ERROR
33           No error has been recorded. The value of this symbolic constant is
34           guaranteed to be 0.
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36       GL_INVALID_ENUM
37           An unacceptable value is specified for an enumerated argument. The
38           offending command is ignored and has no other side effect than to
39           set the error flag.
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41       GL_INVALID_VALUE
42           A numeric argument is out of range. The offending command is
43           ignored and has no other side effect than to set the error flag.
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45       GL_INVALID_OPERATION
46           The specified operation is not allowed in the current state. The
47           offending command is ignored and has no other side effect than to
48           set the error flag.
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50       GL_INVALID_FRAMEBUFFER_OPERATION
51           The framebuffer object is not complete. The offending command is
52           ignored and has no other side effect than to set the error flag.
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54       GL_OUT_OF_MEMORY
55           There is not enough memory left to execute the command. The state
56           of the GL is undefined, except for the state of the error flags,
57           after this error is recorded.
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59       GL_STACK_UNDERFLOW
60           An attempt has been made to perform an operation that would cause
61           an internal stack to underflow.
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63       GL_STACK_OVERFLOW
64           An attempt has been made to perform an operation that would cause
65           an internal stack to overflow.
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67       When an error flag is set, results of a GL operation are undefined only
68       if GL_OUT_OF_MEMORY has occurred. In all other cases, the command
69       generating the error is ignored and has no effect on the GL state or
70       frame buffer contents. If the generating command returns a value, it
71       returns 0. If glGetError itself generates an error, it returns 0.
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74       Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2012 Khronos
75       Group. This document is licensed under the SGI Free Software B License.
76       For details, see http://oss.sgi.com/projects/FreeB/.
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AUTHORS

79       opengl.org
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83opengl.org                        06/10/2014                    GLGETERROR(3G)
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