On Sep 3, 2009, at 2:09 AM, Chris Wood wrote:
What's the state of play now with >8bit colour modes in snow leopard?
I'm afraid I'm not the person to answer this question, but I'm not aware of anything that has changed.
Next, core image performance. I've read somewhere that CI is now implemented using OpenCL, and as OpenCL isn't supported on my GPU that would imply CI is now running on the CPU (this would be a disaster for me, and I'd have to drop SL support until the situation changes or I can re-write the whole thing in GLSL :( ). If it IS running on CPU, that would explain why performance is down and CPU usage is up. Can anyone confirm what's going on here?
No, Core Image will still run on your GPU. OpenCL is only used for machines that support it, although if I recall correctly it may also be used for the software path. So for hardware newer than yours or older than yours, OpenCL is involved :)
Last quick question: I can't access any of the openCL patches in QC4 it seems. It's supposed to run on the CPU if the GPU isn't supported, so is there any way to tell QC to let me play with them even if performance is bad?
I think this is an unfortunate regression in the last little bit of development. Please file a bug if you have time, but it is a known issue if you don't. QC should be using the CPU path if the GPU doesn't support it, but that's not the case right now.
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