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glgeterror(3g) [osx man page]

GLGETERROR(3G)															    GLGETERROR(3G)

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, 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
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)
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