Changes between Version 15 and Version 16 of OpenCLTransformation

Timestamp:

08/07/14 14:03:19 (12 years ago)

Author:

fuufusuu

Comment:

--

OpenCLTransformation

@@ -22 +22 @@
 }}}
 
+=== Notes About Address Space ===
+* 'clSetKernelArg': sets arguments for an array of each device in the kernel. 
 
+Currently, this method
+{{{
+err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &input);
+}}}
+
+Is replaced by careful use of malloc, but a method may be implemented later.
+
+* 'Private (local)' : Each kernel gets it's own version of this variable. malloc + memcpy is the way to do this.
+
+* 'Global' : Each kernel shares this data, an update to one will affect the other. Pointer with memory location. For regular non pointer variables, make a pointer and assign it to it, then use the pointer.
+
+* 'Group' : Each workgroup shares the same data. Currently unimplemented.
+{{{
+  ((args*)kernel.arguments)->input = input;
+  //global
+
+  ((args*)kernel.arguments)->param[2] = (int *)malloc(sizeof(int));
+  memcpy(((args*)kernel.arguments)->param[2], &count, sizeof(int));
+  //local
+}}}
 
 == Methods and equivalents ==
@@ -75 +97 @@
 }}}
 
-err  = clSetKernelArg(kernel, 0, sizeof(cl_mem), &input);
-err |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &output);
-err |= clSetKernelArg(kernel, 2, sizeof(unsigned int), &count);
-
-* 'clSetKernelArg': sets arguments for an array of each device in the kernel. 
-
-Support for global, local, constant and group, local being the default
-Private (local) - variable assignment, or malloc + memcpy
-
-Global - pointer with memory location. For regular non pointer variables, make a pointer and assign it to it, then use the pointer
-Global variables can be declared in program source but they must use the "constant" address space qualifier and need to be initialized. 
-You cannot have global variables that can be modified by kernels and where the modified values are persistent across work-groups and kernel executions. 
-
-Constant is just like global, but read only
-
-group - ???
-{{{
-  ((args*)kernel.arguments)->input = input;
-  
-  ((args*)kernel.arguments)->output = output;
-
-  ((args*)kernel.arguments)->count = count;
-}}}
 
 err = clGetKernelWorkGroupInfo(kernel, device_id, CL_KERNEL_WORK_GROUP_SIZE, sizeof(local), &local, NULL);