Signature
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.
Version Support
| glGetError |
See Also
Copyright
Copyright
1991-2006 Silicon Graphics, Inc.
Copyright
2010-2014 Khronos Group.
This document is licensed under the SGI
This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/
.
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
glGetError