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ARB_multisample

Specifying "AGL_SAMPLE_BUFFERS_ARB, 1" in my pixel format causes aglCreateContext to fail with "AGL invalid pixel format".

Radeon 7600 mobility, 10.2.3
I'm not specifying NO_RECOVERY.
aglChoosePixelFormat returns a format without complaint.
Yes, GL_ARB_multisample appears in my extensions string.

Why would this be happening?

GLint attrib[] = { AGL_RGBA, AGL_DEPTH_SIZE, 32, AGL_DOUBLEBUFFER,
AGL_SAMPLE_BUFFERS_ARB, 1,
// AGL_SAMPLES_ARB, 2, <- uncommenting/changing has no effect
AGL_NONE };
fmt = aglChoosePixelFormat (NULL, 0, attrib);
CheckErrors(); // checks for agl/gl errors... no errors
ensure (fmt != NULL); // ok
ctx = aglCreateContext (fmt, NULL);
CheckErrors(); // gets AGL invalid pixel format
ensure (ctx != NULL); // fails

Thanks,
Dan
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