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////////////////////////////////////////////////////////////////////////////
// File: CuTexImage.cpp
// Author: Changchang Wu
// Description : implementation of the CuTexImage class.
//
// Copyright (c) 2011 Changchang Wu (ccwu@cs.washington.edu)
// and the University of Washington at Seattle
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// Version 3 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <algorithm>
#include <stdlib.h>
#include <vector>
#include <fstream>
using namespace std;
#include <cuda.h>
#include <cuda_runtime_api.h>
#include "CuTexImage.h"
#if CUDA_VERSION <= 2010
#error "Require CUDA 2.2 or higher"
#endif
namespace pba {
CuTexImage::CuTexImage() {
_owner = true;
_cuData = NULL;
_numBytes = _numChannel = 0;
_imgWidth = _imgHeight = 0;
}
CuTexImage::~CuTexImage() {
if (_cuData && _owner) cudaFree(_cuData);
}
void CuTexImage::ReleaseData() {
if (_cuData && _owner) cudaFree(_cuData);
_cuData = NULL;
_numBytes = 0;
}
void CuTexImage::SwapData(CuTexImage& src) {
if (_cuData == src._cuData) return;
void* cuData = _cuData;
unsigned int numChannel = _numChannel;
unsigned int imgWidth = _imgWidth;
unsigned int imgHeight = _imgHeight;
bool owner = _owner;
size_t numBytes = _numBytes;
_cuData = src._cuData;
_numChannel = src._numChannel;
_numBytes = src._numBytes;
_imgWidth = src._imgWidth;
_imgHeight = src._imgHeight;
_owner = src._owner;
src._cuData = cuData;
src._numChannel = numChannel;
src._numBytes = numBytes;
src._imgWidth = imgWidth;
src._imgHeight = imgHeight;
src._owner = owner;
}
bool CuTexImage::InitTexture(unsigned int width, unsigned int height,
unsigned int nchannel) {
size_t size = sizeof(float) * width * height * nchannel;
_imgWidth = width;
_imgHeight = height;
_numChannel = nchannel;
if (size <= _numBytes) return true;
if (_cuData && _owner) cudaFree(_cuData);
// allocate the array data
cudaError_t e = cudaMalloc(&_cuData, size);
_numBytes = e == cudaSuccess ? size : 0;
_owner = true;
return e == cudaSuccess;
}
void CuTexImage::SetTexture(void* data, unsigned int width,
unsigned int nchannel) {
if (_cuData && _owner) cudaFree(_cuData);
_imgWidth = width;
_imgHeight = 1;
_numChannel = nchannel;
_numBytes = sizeof(float) * width * _imgHeight * _numChannel;
_cuData = data;
_owner = false;
}
void CuTexImage::CopyFromHost(const void* buf) {
if (_cuData == NULL || buf == NULL || GetDataSize() == 0) return;
cudaMemcpy(_cuData, buf, _imgWidth * _imgHeight * _numChannel * sizeof(float),
cudaMemcpyHostToDevice);
}
void CuTexImage::CopyFromDevice(const void* buf) {
if (_cuData == NULL) return;
cudaMemcpy((char*)_cuData, buf,
_imgWidth * _imgHeight * _numChannel * sizeof(float),
cudaMemcpyDeviceToDevice);
}
void CuTexImage::CopyToHost(void* buf) {
if (_cuData == NULL) return;
size_t sz = _imgWidth * _imgHeight * _numChannel * sizeof(float);
// cudaThreadSynchronize();
cudaMemcpy(buf, _cuData, sz, cudaMemcpyDeviceToHost);
cudaThreadSynchronize();
}
void CuTexImage::SaveToFile(const char* name) {
ofstream out(name);
vector<float> value(GetLength());
CopyToHost(&value[0]);
for (size_t i = 0; i < value.size(); ++i) out << value[i] << '\n';
}
} // namespace pba
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