Question on glBufferData / glBufferSubData

Hello,

I have a question about PyOpenGL and hope that you can help me.

While working through the arcsynthesis opengl tutorial I came
across the following issue.

The example

This works fine:

Hello,

I have a question about PyOpenGL and hope that you can help me.

While working through the arcsynthesis opengl tutorial I came
across a problem using glBufferSubData.

My code is here:

http://bpaste.net/show/FAhw0W1Hx4WDW9toa75H/

This works fine:

glBufferData(GL_ARRAY_BUFFER, ADT.arrayByteCount(npData),
             ADT.voidDataPointer(npData), GL_STATIC_DRAW)

But using

glBufferSubData(GL_ARRAY_BUFFER, 0, ADT.arrayByteCount(npData), npData)

or (I guess identical)

glBufferSubData(GL_ARRAY_BUFFER, 0, ADT.arrayByteCount(npData),
ADT.voidDataPointer(npData))

results in  an OpenGL Error 1281 Invalid Type after a few
seconds. During the first 1 - 5 seconds the program works as expected.

Can someone tell me what causes the problem?

Kind regards,
Walter

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