'Usage of function clGetExtensionFunctionAddress

I'm new to OpenCL extensions and I try to use the extension function clImportMemoryARM witht code blow:

cl_mem buffer = NULL;
clImportMemoryARM = (clImportMemoryARMFunc)clGetExtensionFunctionAddressForPlatform(plt->platforms[0], "clImportMemoryARM");
buffer = clImportMemoryARM(plt->context[0], 0, NULL, NULL, 0, &ret);

But I recieved the error ‘clImportMemoryARMFunc’ was not declared in this scope in build, and I changed clImportMemoryARMFunc with clImportMemoryARM also recieved the error message error: assignment of function ‘_cl_mem clImportMemoryARM(cl_context, cl_mem_flags, const cl_import_properties_arm, void, size_t, cl_int). I just don't konw how to use the function like this, could any tech-savvy can solve the problem?

Thanks a lot!

opencl


Solution 1:[1]

It because the driver did not expose clImportMemoryARM to user so you have to define a function pointer youself like this:

typedef cl_mem(clImportMemoryARM_func)
(cl_context                     psContext,
cl_mem_flags                    bfFlags,
const cl_import_properties_arm *properties,
void *                          pvMemory,
size_t                          uiSize,
cl_int *                        piErrorCodeRet);

and then you can use function pointer to this API,like this:

clImportMemoryARM_func *clImportMemoryARM = NULL;

clImportMemoryARM = (clImportMemoryARM_func *)clGetExtensionFunctionAddressForPlatform(plt->platforms[0], "clImportMemoryARM");

Solution 2:[2]

You need to include cl_ext.h:

#include <CL/cl_ext.h>

This file is part of OpenCL headers. This header should have all extensions which don't have "external dependencies" (like e.g OpenGL), and it also has clImportMemoryARM and a bunch of other ARM functions and declarations.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Michael
Solution 2 mogu

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