cuda-samples/Samples/volumeFiltering/volume.cpp

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// CUDA Runtime
#include <cuda_runtime.h>

// Helper functions
#include <helper_cuda.h>
#include <helper_math.h>
#include "volume.h"

void Volume_init(Volume *vol, cudaExtent dataSize, void *h_data,
                 int allowStore) {
  // create 3D array
  vol->channelDesc = cudaCreateChannelDesc<VolumeType>();
  checkCudaErrors(
      cudaMalloc3DArray(&vol->content, &vol->channelDesc, dataSize,
                        allowStore ? cudaArraySurfaceLoadStore : 0));
  vol->size = dataSize;

  if (h_data) {
    // copy data to 3D array
    cudaMemcpy3DParms copyParams = {0};
    copyParams.srcPtr =
        make_cudaPitchedPtr(h_data, dataSize.width * sizeof(VolumeType),
                            dataSize.width, dataSize.height);
    copyParams.dstArray = vol->content;
    copyParams.extent = dataSize;
    copyParams.kind = cudaMemcpyHostToDevice;
    checkCudaErrors(cudaMemcpy3D(&copyParams));
  }

  if (allowStore) {
    cudaResourceDesc surfRes;
    memset(&surfRes, 0, sizeof(cudaResourceDesc));
    surfRes.resType = cudaResourceTypeArray;
    surfRes.res.array.array = vol->content;

    checkCudaErrors(cudaCreateSurfaceObject(&vol->volumeSurf, &surfRes));
  }

  cudaResourceDesc texRes;
  memset(&texRes, 0, sizeof(cudaResourceDesc));

  texRes.resType = cudaResourceTypeArray;
  texRes.res.array.array = vol->content;

  cudaTextureDesc texDescr;
  memset(&texDescr, 0, sizeof(cudaTextureDesc));

  texDescr.normalizedCoords = true;
  texDescr.filterMode = cudaFilterModeLinear;
  texDescr.addressMode[0] = cudaAddressModeWrap;
  texDescr.addressMode[1] = cudaAddressModeWrap;
  texDescr.addressMode[2] = cudaAddressModeWrap;
  texDescr.readMode =
      cudaReadModeNormalizedFloat;  // VolumeTypeInfo<VolumeType>::readMode;

  checkCudaErrors(
      cudaCreateTextureObject(&vol->volumeTex, &texRes, &texDescr, NULL));
}

void Volume_deinit(Volume *vol) {
  checkCudaErrors(cudaDestroyTextureObject(vol->volumeTex));
  checkCudaErrors(cudaDestroySurfaceObject(vol->volumeSurf));
  checkCudaErrors(cudaFreeArray(vol->content));
  vol->content = 0;
}