CODEWITHSUNDEEP
opencl
Piyush Kumar
Piyush Kumar

Reputation: 167

Returning values from a vector type memory in openCL?

I am trying to use vectors in my OpenCL code. Prior to this, I was mapping the memory to and fro as 

cmDevSrc= clCreateBuffer(cxGPUContext,CL_MEM_READ_WRITE,sizeof(cl_char) * (row_info->width) * bpp,NULL,&ciErr);
cmDevDest=clCreateBuffer(cxGPUContext,CL_MEM_READ_WRITE,sizeof(cl_char) * (row_info->width) * bpp,NULL,&ciErr);

I am using cmDevSrc as my source array of unsigned chars and cmdDevDest as for destination. When I am trying to implement the same using vectors, I am passing the kernel argument as 

clSetKernelArg(ckKernel,1,sizeof(cl_uchar4 )*row_info->rowbytes*bpp,&cmDevDest);

with cmDevDest being cl_uchar4 cmDevDest. But now, I cannot read back my data using mapping , with the following error,

incompatible type for argument 2 of ‘clEnqueueMapBuffer’ 
/usr/include/CL/cl.h:1066: note: expected ‘cl_mem’ but argument is of type ‘cl_uchar4’

I don't know any other method for this compile time error at this time and I am searching net but any help will very helpful.

Thanks Piyush

Upvotes: 1

Views: 352

Answers (1)

jprice
jprice

Reputation: 9925

The clCreateBuffer function returns a cl_mem object, not a cl_uchar4 (or anything else), so cmDevSrc and cmDevDest should be declared as cl_mem variables. This is also what is causing the compiler error for your call to clEnqueueMapBuffer.

Additionally, the arg_size argument of clSetKernelArg should be sizeof(cl_mem) when you are passing memory object arguments, not the size of the buffer:

clSetKernelArg(ckKernel, 1, sizeof(cl_mem), &cmDevDest);

Upvotes: 3

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