Mapping buffer objects
OpenCL provides a mechanism to map a region of a buffer directly into host memory instead of using the clEnqueue[Read|Write]Buffer functions. These mapped regions can be returned to the application. The application can use this mapped memory region based on the cl_map_flags flag value which is set during mapping. Now the first question which would arise in the readers mind is that how different are the two APIs clEnqueueMapBuffer and clEnqueueReadBuffer.
The clEnqueueReadBuffer function reads into a memory location pre-allocated. But clEnqueueMapBuffer returns a pointer to the mapped region.
Other difference between clEnqueueReadBuffer and clEnqueueMapBuffer is the map_flags argument. If map_flags is set to CL_MAP_READ, the ...
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