cudacvtfloat.cu
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright 2016 Li Li, Colin Heinzmann *
* *
* Licensed under the Apache License, Version 2.0 (the "License"); *
* you may not use this file except in compliance with the License. *
* You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an "AS IS" BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <iostream>
using namespace std;
#include "cudadefines.hpp"
namespace br { namespace cuda { namespace cvtfloat {
__global__ void kernel(const unsigned char* src, float* dst, int rows, int cols) {
// get my index
int rowInd = blockIdx.y*blockDim.y + threadIdx.y;
int colInd = blockIdx.x*blockDim.x + threadIdx.x;
// bounds check
if (rowInd >= rows || colInd >= cols) {
return;
}
int index = rowInd*cols + colInd;
dst[index] = (float)src[index];
}
void wrapper(void* src, void** dst, int rows, int cols) {
cudaError_t err;
CUDA_SAFE_MALLOC(dst, rows*cols*sizeof(float), &err);
dim3 threadsPerBlock(8, 8);
dim3 blocks(
cols / threadsPerBlock.x + 1,
rows / threadsPerBlock.y + 1
);
kernel<<<threadsPerBlock, blocks>>>((const unsigned char*)src, (float*)(*dst), rows, cols);
CUDA_KERNEL_ERR_CHK(&err);
// free the src memory since it is now in a newly allocated dst
CUDA_SAFE_FREE(src, &err);
}
}}}