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package com.mbien.opencl;
import com.sun.gluegen.runtime.BufferFactory;
import com.sun.gluegen.runtime.PointerBuffer;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import static com.mbien.opencl.CLException.*;
/**
*
* @author Michael Bien
*/
public abstract class CLMemory <B extends Buffer> implements CLResource {
B buffer;
public final long ID;
protected final CLContext context;
protected final CL cl;
protected <Buffer> CLMemory(CLContext context, long id) {
this.context = context;
this.cl = context.cl;
this.ID = id;
}
protected CLMemory(CLContext context, B directBuffer, long id) {
this.buffer = directBuffer;
this.context = context;
this.cl = context.cl;
this.ID = id;
}
protected static final boolean isHostPointerFlag(int flags) {
return (flags & CL.CL_MEM_COPY_HOST_PTR) != 0 || (flags & CL.CL_MEM_USE_HOST_PTR) != 0;
}
protected static final int sizeOfBufferElem(Buffer buffer) {
if (buffer instanceof ByteBuffer) {
return BufferFactory.SIZEOF_BYTE;
} else if (buffer instanceof IntBuffer) {
return BufferFactory.SIZEOF_INT;
} else if (buffer instanceof ShortBuffer) {
return BufferFactory.SIZEOF_SHORT;
} else if (buffer instanceof FloatBuffer) {
return BufferFactory.SIZEOF_FLOAT;
} else if (buffer instanceof DoubleBuffer) {
return BufferFactory.SIZEOF_DOUBLE;
}
throw new RuntimeException("Unexpected buffer type " + buffer.getClass().getName());
}
/**
* Returns a new instance of CLMemory pointing to the same CLResource but using a different Buffer.
*/
public abstract <T extends Buffer> CLMemory<T> cloneWith(T directBuffer);
public CLMemory<B> use(B buffer) {
if(this.buffer != null && buffer != null && this.buffer.getClass() != buffer.getClass()) {
throw new IllegalArgumentException(
"expected a Buffer of class " + this.buffer.getClass()
+" but got " + buffer.getClass());
}
this.buffer = buffer;
return this;
}
public B getBuffer() {
return buffer;
}
/**
* Returns the size of the wrapped direct buffer in byte.
*/
public int getSize() {
if(buffer == null) {
return 0;
}
return sizeOfBufferElem(buffer) * buffer.capacity();
}
public long getCLSize() {
PointerBuffer pb = PointerBuffer.allocateDirect(1);
int ret = cl.clGetMemObjectInfo(ID, CL.CL_MEM_SIZE, PointerBuffer.elementSize(), pb.getBuffer(), null);
checkForError(ret, "can not optain buffer info");
return pb.get();
}
public void release() {
int ret = cl.clReleaseMemObject(ID);
context.onMemoryReleased(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 CLMemory<?> other = (CLMemory<?>) obj;
if (this.ID != other.ID) {
return false;
}
if (this.context != other.context && (this.context == null || !this.context.equals(other.context))) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 83 * hash + (int) (this.ID ^ (this.ID >>> 32));
hash = 83 * hash + (this.context != null ? this.context.hashCode() : 0);
return hash;
}
/**
* Memory settings for configuring CLMemory.
*/
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),
/**
* Enum representing CL.CL_MEM_USE_HOST_PTR.
* 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_BUFFER(CL.CL_MEM_USE_HOST_PTR),
// ALLOC_HOST_PTR(CL_MEM_ALLOC_HOST_PTR), // this is the default in java world anyway
/**
* Enum representing CL.CL_MEM_COPY_HOST_PTR.
* 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_BUFFER(CL.CL_MEM_COPY_HOST_PTR);
/**
* Value of wrapped OpenCL flag.
*/
public final int CONFIG;
private Mem(int config) {
this.CONFIG = config;
}
public static Mem valueOf(int bufferFlag) {
switch (bufferFlag) {
case CL.CL_MEM_READ_WRITE:
return Mem.READ_WRITE;
case CL.CL_MEM_READ_ONLY:
return Mem.READ_ONLY;
case CL.CL_MEM_USE_HOST_PTR:
return Mem.USE_BUFFER;
// case(CL_MEM_ALLOC_HOST_PTR):
// return ALLOC_HOST_PTR;
case CL.CL_MEM_COPY_HOST_PTR:
return Mem.COPY_BUFFER;
}
return null;
}
static int flagsToInt(Mem[] flags) {
int clFlags = 0;
if (flags != null) {
for (int i = 0; i < flags.length; i++) {
clFlags |= flags[i].CONFIG;
}
}
if (clFlags == 0) {
clFlags = CL.CL_MEM_READ_WRITE;
}
return clFlags;
}
}
}
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