import opencl_course source for a start

2013-03-11 22:03:27 +01:00
commit 08272c7de5
64 changed files with 12336 additions and 0 deletions
--- a/opencl/reduce/main.cpp
+++ b/opencl/reduce/main.cpp
@@ -0,0 +1,116 @@
+///original author: Erwin Coumans
+#include "btOpenCLUtils.h"
+#include "../parallel_primitives/host/btOpenCLArray.h"
+#include "../parallel_primitives/host/btLauncherCL.h"
+#include <stdio.h>
+
+
+#define MSTRINGIFY(A) #A
+const char* kernelString= MSTRINGIFY(
+__kernel void ReduceGlobal(__global int* d_in, __global int* d_out, int numElements)
+{
+	int myId = get_global_id(0);
+	int tid = get_local_id(0);
+
+
+	int ls = get_local_size(0);
+	for (unsigned int s=ls/2;s>0;s>>=1)
+	{
+		if (myId<numElements)
+		{
+			if (tid<s)
+			{
+				d_in[myId] += d_in[myId+s];
+			}
+		}
+		barrier(CLK_GLOBAL_MEM_FENCE);
+	}
+	if (tid==0)
+	{
+		if (myId<numElements)
+		{
+			d_out[get_group_id(0)]=d_in[myId];
+		}
+	}
+}
+);
+
+int main(int argc, char* argv[])
+{
+	int ciErrNum = 0;
+	int preferred_device = -1;
+	int preferred_platform = -1;
+	cl_platform_id		platformId;
+	cl_context			ctx;
+	cl_command_queue	queue;
+	cl_device_id		device;
+	cl_kernel			addKernel;
+	ctx = btOpenCLUtils::createContextFromType(CL_DEVICE_TYPE_ALL, &ciErrNum,0,0,preferred_device,preferred_platform,&platformId);
+	btOpenCLUtils::printPlatformInfo(platformId);
+	oclCHECKERROR(ciErrNum, CL_SUCCESS);
+	if (!ctx) {
+		printf("No OpenCL capable GPU found!");
+		return 0;
+	}
+
+	device = btOpenCLUtils::getDevice(ctx,0);
+	queue = clCreateCommandQueue(ctx, device, 0, &ciErrNum);
+	addKernel = btOpenCLUtils::compileCLKernelFromString(ctx,device,kernelString,"ReduceGlobal",&ciErrNum);
+	oclCHECKERROR(ciErrNum, CL_SUCCESS);
+	int numElements = 1024*1024;
+	btOpenCLArray<int> a(ctx,queue);
+	btOpenCLArray<int> b(ctx,queue);
+	btAlignedObjectArray<int> hostA;
+	btAlignedObjectArray<int> hostB;
+
+	for (int i=0;i<numElements;i++)
+	{
+		hostA.push_back(1);
+		hostB.push_back(0.f);
+	}
+	a.copyFromHost(hostA);
+	b.copyFromHost(hostB);
+	
+	int hostSum= 0;
+	for (int i=0;i<numElements;i++)
+	{
+		hostSum += hostA.at(i);
+	}
+	b.resize(numElements);
+
+	{
+		btLauncherCL launcher( queue, addKernel);
+		launcher.setBuffer( a.getBufferCL());
+		launcher.setBuffer( b.getBufferCL());
+		launcher.setConst(  numElements );
+		launcher.launch1D( numElements,1024);
+	}
+	clFinish(queue);
+	{
+		btLauncherCL launcher( queue, addKernel);
+		launcher.setBuffer( b.getBufferCL());
+		launcher.setBuffer( a.getBufferCL());
+		launcher.setConst(  1024 );
+		launcher.launch1D( 1024,1024);
+	}
+	clFinish(queue);
+
+	printf("hostSum = %d\n", hostSum);
+
+	int clSum = a.at(0);
+	printf("clSum = %d\n", clSum );
+	if (hostSum != clSum)
+	{
+		printf("Incorrect result\n");
+	} else
+	{
+		printf("Correct result\n");
+	}
+
+	
+	clReleaseCommandQueue(queue);
+	clReleaseContext(ctx);
+	printf("press key\n");
+	getchar();
+	return 0;
+}