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OpenGL glEnableClientState (): GL_INVALID_OPERATION

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I am getting an error GL_INVALID_OPERATION when calling glEnableClientState (GL_VERTEX_ARRAY) in my application. Other functions (e.g. GL_COLOR_ARRAY) work fine, and the problematic call is definitely not made inside a glBegin() ... glEnd() sequence. I am also making sure to call glDisableClientState() for all enabled client states when done rendering a primitive. I tried putting a glEnd() and a glDisableClientState (GL_VERTEX_ARRAY) call in front of the failing call just to make sure, but it didn't help. I am having that at two different locations in my program, and apparently only if rather large vertex arrays are involved (though OpenGL should not know anything about buffer size when passing a buffer address with that call). What could that be? I am totally clueless and pretty frustrated. Edit: I just found out that the error occurs on whatever client state I try to set first when entering the primitive renderer. When I just issue the failed call a second time, it suddenly works. What could that be? Btw, even if successfully setting all client states, nothing gets rendered. The buffers all seem fine though. I am having other code rendering using glDrawArrays() that works fine, so it doesn't seem to be that I don't understand how to handle this. [Edited by - karx11erx on June 14, 2007 5:22:48 PM]

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