The GPU will happily swizzle the components for you.
The QuartzComposerOffline example uses:
glReadPixels(0, 0, width, height,
GL_BGRA,GL_UNSIGNED_INT_8_8_8_8_REV, _scratchBufferPtr);
This causes an endian-reversed image on my Intel Leopard machine.
Changing GL_UNSIGNED_INT_8_8_8_8_REV to GL_UNSIGNED_INT_8_8_8_8 for
little endian processors did the trick.
--
Kevin Packard
blackfrog software, inc.
http://blackfrog.com
On Apr 4, 2008, at 10:40 AM, [EMAIL PROTECTED] wrote:
My app uses QC to perform offscreen rendering. All works well with
Tiger PPC or Intel and Leopard PPC.
However with Leopard Intel the colour components and alpha are mixed
up.
The same thing happens with QuartzComposerOffline example code.
The Tiff files created by this app are also messed up.
I get QC to produce an NSImage whereas the QuartzComposerOffline
example performs a gpu readback.
Either way the alpha and colors appear to be in a weird order. (Not
just reversed)
Before I write code to un-mangle it, does anyone have any ideas?
Thanks,
Adam
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