Which OpenCL APIs load kernels to FPGA?

Thanks.

It seems that there is some basic behavior that I don't understand: in compile time, the compiler does not know how many instances of a kernel I would be willing to launch since this is declared only during the call of clEnqueueNDRangeKernel() with global and local sizes. The only clue the compiler has is a kernel _attribute__((reqd_work_group_size()) and this is not mandatory. Therefore I understood, the actual wiring takes place when calling clEnqueueNDRangeKernel().

I am working on an image processing project and I am concerned by the time the wiring/launching takes (fractions of a second ?) and whether the wiring will occur time after time if I make such a loop:

for(i = ....)

{

Cpu write image to InputBuffer,

clSetKernelArg(...&InputBuffer),

clSetKernelArg(...&OutputBuffer),

clEnqueueNDRangeKernel(... global size, local size, ...),

clFinish(),

clEnqueueMapBuffer(...OutputBuffer)

Cpu read processed image

}

in such scenario, when will the actual wiring occur and will it occur only once ?

Is there a better structure of program flow to meet my needs ?

thanks.