HP b2600 Reference Manual page 387

Notes
If an error is generated, glRenderMode returns 0 regardless of the current render mode.
Errors
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•
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Associated Gets
glGet with argument GL_RENDER_MODE
See Also
glFeedbackBuffer,
glInitNames,
glLoadName,
glPassThrough,
glPushName,
glSelectBuffer
Chapter 16
GL_INVALID_ENUM is generated if mode is not one of the three accepted values.
GL_INVALID_OPERATION is generated if glSelectBuffer is called while the render
mode is GL_SELECT, or if glRenderMode is called with argument GL_SELECT
before glSelectBuffer is called at least once.
GL_INVALID_OPERATION is generated if glFeedbackBuffer is called while the
render mode is GL_FEEDBACK, or if glRenderMode is called with argument
GL_FEEDBACK before glFeedbackBuffer is called at least once.
GL_INVALID_OPERATION is generated if glRenderMode is executed between the
execution of glBegin and the corresponding execution of glEnd.
R
glRenderMode
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