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OSX fix for BitonicSort demo #2

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OSX fix for BitonicSort demo #2

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20 changes: 19 additions & 1 deletion src/com/jogamp/opencl/demos/bitonicsort/BitonicSort.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import com.jogamp.opencl.CLCommandQueue;
import com.jogamp.opencl.CLContext;
import com.jogamp.opencl.CLDevice;
import com.jogamp.opencl.CLDevice.Type;
import com.jogamp.opencl.CLKernel;
import com.jogamp.opencl.CLProgram;
import java.io.IOException;
Expand All @@ -21,7 +22,9 @@
/**
* Bitonic sort optimized for GPUs.
* Uses NVIDIA's bitonic merge sort kernel.
*
* @author Michael Bien
* @author rexguo (bug fix for OSX)
*/
public class BitonicSort {

Expand All @@ -46,9 +49,24 @@ public BitonicSort() throws IOException {

try{

context = CLContext.create();
/**
* It is possible that a CPU context is created on
* machines with under-powered GPUs. So we explicitly
* ask for a GPU device.
*
* On CPU devices on OSX 10.6.8, Core 2 Duo 3GHz, trying
* to setup the workgroup size results in:
* Exception in thread "main" java.lang.RuntimeException:
* Minimum work-group size 512 required by this application
* is not supported on this device.
*/
context = CLContext.create(Type.GPU);
CLCommandQueue queue = context.getMaxFlopsDevice().createCommandQueue();

out.println(context);
out.println(context.getMaxFlopsDevice());
out.println();

out.println("Initializing OpenCL bitonic sorter...");
kernels = initBitonicSort(queue);

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