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package com.mbien.opencl;
import java.nio.ByteBuffer;
import static com.mbien.opencl.CLException.*;
/**
*
* @author Michael Bien
*/
public class CLBuffer {
public enum MEM {
/**
* This flag specifies that the memory object will be read and
* written by a kernel.
*/
READ_WRITE(CL.CL_MEM_READ_WRITE),
/**
* This flags specifies that the memory object will be written
* but not read by a kernel.
* Reading from a buffer or image object created with WRITE_ONLY
* inside a kernel is undefined.
*/
WRITE_ONLY(CL.CL_MEM_WRITE_ONLY),
/**
* This flag specifies that the memory object is a read-only memory
* object when used inside a kernel. Writing to a buffer or image object
* created withREAD_ONLY inside a kernel is undefined.
*/
READ_ONLY(CL.CL_MEM_READ_ONLY);
/**
* If specified, it indicates that the application wants the OpenCL
* implementation to use memory referenced by host_ptr as the storage
* bits for the memory object. OpenCL implementations are allowed
* to cache the buffer contents pointed to by host_ptr in device memory.
* This cached copy can be used when kernels are executed on a device.
*/
// USE_HOST_PTR(CL.CL_MEM_USE_HOST_PTR),
// ALLOC_HOST_PTR(CL.CL_MEM_ALLOC_HOST_PTR), // this is the default in java world anyway
/**
* If CL_MEM_COPY_HOST_PTR specified, it indicates that the application
* wants the OpenCL implementation to allocate memory for the memory object
* and copy the data from memory referenced by host_ptr.<br/>
* COPY_HOST_PTR and USE_HOST_PTR are mutually exclusive.
*/
// COPY_HOST_PTR(CL.CL_MEM_COPY_HOST_PTR);
/**
* Value of wrapped OpenCL flag.
*/
public final int CL_FLAG;
private MEM(int CL_TYPE) {
this.CL_FLAG = CL_TYPE;
}
public static MEM valueOf(int bufferFlag) {
switch(bufferFlag) {
case(CL.CL_MEM_READ_WRITE):
return READ_WRITE;
case(CL.CL_MEM_READ_ONLY):
return READ_ONLY;
// case(CL.CL_MEM_USE_HOST_PTR):
// return USE_HOST_PTR;
// case(CL.CL_MEM_ALLOC_HOST_PTR):
// return ALLOC_HOST_PTR;
// case(CL.CL_MEM_COPY_HOST_PTR):
// return COPY_HOST_PTR;
}
return null;
}
static int flagsToInt(MEM[] flags) {
int clFlags = CL.CL_MEM_READ_WRITE;
if(flags != null) {
for (int i = 0; i < flags.length; i++) {
clFlags |= flags[i].CL_FLAG;
}
}
return clFlags;
}
}
public final ByteBuffer buffer;
public final long ID;
private final CLContext context;
private final CL cl;
CLBuffer(CLContext context, ByteBuffer directBuffer, int flags) {
if(!directBuffer.isDirect())
throw new IllegalArgumentException("buffer is not a direct buffer");
this.buffer = directBuffer;
this.context = context;
this.cl = context.cl;
int[] intArray = new int[1];
this.ID = cl.clCreateBuffer(context.ID, flags, directBuffer.capacity(), null, intArray, 0);
checkForError(intArray[0], "can not create cl buffer");
}
public void release() {
int ret = cl.clReleaseMemObject(ID);
context.onBufferReleased(this);
checkForError(ret, "can not release mem object");
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final CLBuffer other = (CLBuffer) obj;
if (this.buffer != other.buffer && (this.buffer == null || !this.buffer.equals(other.buffer))) {
return false;
}
if (this.context.ID != other.context.ID) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 3;
hash = 29 * hash + (this.buffer != null ? this.buffer.hashCode() : 0);
hash = 29 * hash + (int) (this.context.ID ^ (this.context.ID >>> 32));
return hash;
}
}
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