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Gl.GetError (gb.opengl)
Syntax
STATIC FUNCTION GetError ( ) AS Integer

Return error information

Description

  Gl.GetError 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 Gl.GetError is called, the error code is returned, and the flag is reset to Gl.GL_NO_ERROR. If a call to Gl.GetError returns Gl.GL_NO_ERROR, there has been no detectable error since the last call to Gl.GetError, 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.GL_NO_ERROR when Gl.GetError is called. If more than one flag has recorded an error, Gl.GetError returns and clears an arbitrary error flag value. Thus, Gl.GetError should always be called in a loop, until it returns Gl.GL_NO_ERROR, if all error flags are to be reset.

  Initially, all error flags are set to Gl.GL_NO_ERROR.

  The currently defined errors are as follows:

When an error flag is set, results of a GL operation are undefined only if Gl.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.

Errors

Gl.GL_INVALID_OPERATION is generated if Gl.GetError is called between a call to Gl.Begin and the corresponding call to Gl.End.