Taking pipeline processing to the next level

[finalpatch via Digitalmars-d]

On Tuesday, 6 September 2016 at 14:47:21 UTC, Manu wrote:

>> with a main loop that reads the source buffer in *12* pixels 
>> step, call
>> MySimpleKernel 3 times, then call AnotherKernel 4 times.
>
> It's interesting thoughts. What did you do when buffers weren't 
> multiple of the kernels?

The end of a scan line is special cased . If I need 12 pixels for 
the last iteration but there are only 8 left, an instance of 
Kernel::InputVector is allocated on stack, 8 remaining pixels are 
memcpy into it then send to the kernel. Output from kernel are 
also assigned to a stack variable first, then memcpy 8 pixels to 
the output buffer.