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#ifndef _BICUBICTEXTURE_CU_
#define _BICUBICTEXTURE_CU_

#include <helper_math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// includes, cuda
#include <helper_cuda.h>

typedef unsigned int  uint;
typedef unsigned char uchar;

#include "bicubicTexture_kernel.cuh"

cudaArray *d_imageArray = 0;

extern "C" void initTexture(int imageWidth, int imageHeight, uchar *h_data)
{
    // allocate array and copy image data
    cudaChannelFormatDesc channelDesc = cudaCreateChannelDesc(8, 0, 0, 0, cudaChannelFormatKindUnsigned);
    checkCudaErrors(cudaMallocArray(&d_imageArray, &channelDesc, imageWidth, imageHeight));
    checkCudaErrors(cudaMemcpy2DToArray(d_imageArray,
                                        0,
                                        0,
                                        h_data,
                                        imageWidth * sizeof(uchar),
                                        imageWidth * sizeof(uchar),
                                        imageHeight,
                                        cudaMemcpyHostToDevice));
    free(h_data);

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

    texRes.resType         = cudaResourceTypeArray;
    texRes.res.array.array = d_imageArray;

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

    texDescr.normalizedCoords = false;
    texDescr.filterMode       = cudaFilterModeLinear;
    texDescr.addressMode[0]   = cudaAddressModeClamp;
    texDescr.addressMode[1]   = cudaAddressModeClamp;
    texDescr.readMode         = cudaReadModeNormalizedFloat;

    checkCudaErrors(cudaCreateTextureObject(&texObjLinear, &texRes, &texDescr, NULL));

    memset(&texDescr, 0, sizeof(cudaTextureDesc));
    texDescr.normalizedCoords = false;
    texDescr.filterMode       = cudaFilterModePoint;
    texDescr.addressMode[0]   = cudaAddressModeClamp;
    texDescr.addressMode[1]   = cudaAddressModeClamp;
    texDescr.readMode         = cudaReadModeNormalizedFloat;

    checkCudaErrors(cudaCreateTextureObject(&texObjPoint, &texRes, &texDescr, NULL));
}

extern "C" void freeTexture()
{
    checkCudaErrors(cudaDestroyTextureObject(texObjPoint));
    checkCudaErrors(cudaDestroyTextureObject(texObjLinear));
    checkCudaErrors(cudaFreeArray(d_imageArray));
}

// render image using CUDA
extern "C" void render(int     width,
                       int     height,
                       float   tx,
                       float   ty,
                       float   scale,
                       float   cx,
                       float   cy,
                       dim3    blockSize,
                       dim3    gridSize,
                       int     filter_mode,
                       uchar4 *output)
{
    // call CUDA kernel, writing results to PBO memory
    switch (filter_mode) {
    case MODE_NEAREST:
        d_render<<<gridSize, blockSize>>>(output, width, height, tx, ty, scale, cx, cy, texObjPoint);
        break;

    case MODE_BILINEAR:
        d_render<<<gridSize, blockSize>>>(output, width, height, tx, ty, scale, cx, cy, texObjLinear);
        break;

    case MODE_BICUBIC:
        d_renderBicubic<<<gridSize, blockSize>>>(output, width, height, tx, ty, scale, cx, cy, texObjPoint);
        break;

    case MODE_FAST_BICUBIC:
        d_renderFastBicubic<<<gridSize, blockSize>>>(output, width, height, tx, ty, scale, cx, cy, texObjLinear);
        break;

    case MODE_CATROM:
        d_renderCatRom<<<gridSize, blockSize>>>(output, width, height, tx, ty, scale, cx, cy, texObjPoint);
        break;
    }

    getLastCudaError("kernel failed");
}

#endif
