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OpenGL Locking VBO twice gives null pointer

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Basically just what the title says. I have a dynamic-copy VBO created, and if I lock (glMapBufferARB) it twice, the second time it gives me a null pointer. I've googled, but all the tutorials just have them specifying the data on glBufferDataARB. Is this regular behaviour for OpenGL?

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Original post by _goat
Basically just what the title says. I have a dynamic-copy VBO created, and if I lock (glMapBufferARB) it twice, the second time it gives me a null pointer. I've googled, but all the tutorials just have them specifying the data on glBufferDataARB. Is this regular behaviour for OpenGL?


What about using glUnmapBufferARB it prior to locking it again ?

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Original post by Ingenu
Quote:
Original post by _goat
Basically just what the title says. I have a dynamic-copy VBO created, and if I lock (glMapBufferARB) it twice, the second time it gives me a null pointer. I've googled, but all the tutorials just have them specifying the data on glBufferDataARB. Is this regular behaviour for OpenGL?


What about using glUnmapBufferARB it prior to locking it again ?


Yes, I'm doing that.

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Original post by _goat
Yes, I'm doing that.


Ok then, do you check OpenGL errors before & after mapping/unmapping ?

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