I am not sure if this question is aproppriate

i would like to do some playing with OpenCl code but i got a

limited internet connection and cannot download SDK (which is to big)

I found OpenCl.dll (1.0) in my windows system folder and i think

maybe i could use it with runtime dll linking (without header or

import lib) but also I am somewhat nexperienced in some fields

and I am afraid that it will take in my current situation state

a couple of days ( reading etc)

So i decided to ask maybe someone could help me with that by

providing some opencl setup code i could use with runtime linking?

If no i will be searching myself if yes it maybe could help me,

so much tnx for help...

This might help:

http://msdn.microsoft.com/en-us/library/windows/desktop/ms686944%28v=vs.85%29.aspx

You could use dependency walker to figure out the functions.

http://www.dependencywalker.com/

This is not guaranteed to work though... It would be far better to download the SDK if at all possible.

This might help:

http://msdn.microsoft.com/en-us/library/windows/desktop/ms686944%28v=vs.85%29.aspx

You could use dependency walker to figure out the functions.

http://www.dependencywalker.com/

This is not guaranteed to work though... It would be far better to download the SDK if at all possible.

Yesterdai i was starting runtime loading OpenCl.dll and then checked if i can fetch the appriopriate function pointers and it seem to work as far by now. (header i got from khronos page) so maybe it will be working...

(I hope so - other way it would be if someone got uploaded the headers and lib from the sdk as a small download i found the info that visualstudio like .lib from the sdk can be probably converted with mingw's reimp tool into mingw .a import library)

But maybe dynamic loading would suffice - hope so, I will see

tnx for answer

i began to fetch some opencl calls from some net resources

9this is somewhat experimental sec becaose i hed not mouch

time to read

int main(int argc, char **argv)
{
 
  SetupDllFunctions();
 
 
 cl_platform_id platform_id = 0;
 
 int retval = clGetPlatformIDs_(1, &platform_id, NULL);
 if(retval == CL_SUCCESS ) printf("clGetPlatformIDs success") ;
 
  cl_device_id device_id = 0;
 
  int ret = clGetDeviceIDs_( platform_id, CL_DEVICE_TYPE_GPU, 1, &device_id, NULL );
 
  if(ret == CL_SUCCESS) printf("get device id success ") ;
 
 if(ret == CL_INVALID_PLATFORM) printf("CL_INVALID_PLATFORM") ;
 if(ret == CL_INVALID_DEVICE_TYPE ) printf("CL_INVALID_DEVICE_TYPE ") ;
 if(ret == CL_INVALID_VALUE ) printf("CL_INVALID_VALUE ") ;
 if(ret == CL_DEVICE_NOT_FOUND ) printf("CL_DEVICE_NOT_FOUND ") ;
 
 cl_context context = clCreateContextFromType_(NULL, CL_DEVICE_TYPE_GPU, NULL, NULL, &ret);
 if(ret == CL_SUCCESS) printf("context success ") ;
 
cl_command_queue queue = clCreateCommandQueue_(context, device_id, 0, &ret);
 if(ret == CL_SUCCESS) printf("queue success ") ;
 
 
 
 
 char* kernel_src[2] = { "__kernel void SAXPY (__global float* x, __global float* y, float a) { const int i = get_global_id (0); y [i] += a * x [i]; } ", 0};
 
 
 cl_program program = clCreateProgramWithSource_(context, 1, kernel_src, NULL, &ret);
 if(ret == CL_SUCCESS) printf("create program success ") ;
 if(ret == CL_INVALID_CONTEXT )     printf("CL_INVALID_CONTEXT ") ;
 if(ret == CL_INVALID_VALUE )       printf("CL_INVALID_VALUE ") ;
 if(ret == CL_OUT_OF_HOST_MEMORY  ) printf("CL_OUT_OF_HOST_MEMORY ") ;
 
 
 
  return 0;
}

and the outcome here is

What are those API calls? Why are you not linking directly to the library using the provided headers, but loading it dynamically? You're introducing another point of failure. The error as I see it does not make sense, the context is clearly valid so clearly something is wrong with clCreateProgramWithSource_. Also try to print out information about the platform and device, and try on a CPU device if you have one.

well i said in the first post - I cannot download sdk ( i could only download small files ) so i just decided to use LoadLibrary on my OpenCl.dll which resides in windows/system32

well i said in the first post - I cannot download sdk ( i could only download small files ) so i just decided to use LoadLibrary on my OpenCl.dll which resides in windows/system32

clCreateProgramWithSource_ = GetProcAddress(hOpencl, "clCreateProgramWithSource");

Header i take from khronos page, it defines function names
so in my own pointers i added _ to avoid the conflict

context is raported to be good but i do not know if the clcreateprogramwithsource do not need some special
preseting of other api calls or something :/

I'm saying you do not need to do all that funky LoadLibrary stuff even without an SDK. Just link to your DLL using -lOpenCL, and use the Khronos headers. In any case I don't think it will do a difference. Where did you get this DLL? Where did it come from? Does it have any version information? What platform do you get with your clGetPlatformIDs call? OpenCL works on the basis of vendors providing implementations, there is no one OpenCL.dll that will enable ultimate access to every GPU ever designed, you need an OpenCL driver (standalone for CPU's, and generally built into graphics drivers for GPU's) and its DLL interface (provided by the vendor) which is then registered with the ICD so that you can select it at runtime without having your users link to any particular DLL.

I think i would need mingw import library (opencl.a or something) if i just use -lOpenCL i got