Re: [HOpenGL] MacOSX accumulation buffer.

That sad, because the document is from `Mar 26 2001'... On Jan 27, 2009, at 7:34 PM, Corey O'Connor wrote:

Not I.:-\ Last time I tried I used some hefty desktop graphics cards too. That was several years ago when this technote definitely applied: http://developer.apple.com/technotes/tn/tn2014.html#Section10

"Mac OS X also supports AUX (auxiliary) buffers and an 8-bit stencil buffer. Accumulation buffers are not supported in hardware on Mac OS X."

Cheers, Corey O'Connor

On Tue, Jan 27, 2009 at 10:21 AM, Sebastiaan Visser wrote:

...

Hello,

Maybe my question is not really related to the HOpenGL library in particular, but more general a MacOSX+OpenGL problem. I hope some of you guys recognize this issue.

It seems there is no way to get the accumulation buffer to work efficiently on MacOSX. Using this buffer to implement a neat motion blur slows down the framerate to less than 8 fps on my machine. A brand new Macbook with the newest NVIDIA GeForce 9400M running a very simple demo with just one 3D torus.

I am using this initialization code:

...

initialDisplayMode $= [ ... , WithAccumBuffer ]

initialDisplayCapabilities $= [ ... , Where DisplayAccA IsEqualTo 8 -- Also tried 1, 16, 24, 32... ]

And use the buffer like this:

...

withMotionBlur comp = do accum Mult 0.95 comp accum Accum 0.05 accum Return 1.2

The result looks verry pretty but is terribly slow.

Is there someone how has ever used the accumulation buffer on MacOSX without experiencing slowdowns?

Thanks,

-- sebastiaan