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 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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#include <cuda.h>
#include <helper_cuda.h>

static __global__ void flipSurfaceBits(cudaSurfaceObject_t surfObj, int width, int height) {
    char data;
    unsigned int x = blockIdx.x * blockDim.x + threadIdx.x;
    unsigned int y = blockIdx.y * blockDim.y + threadIdx.y;
    if (x < width && y < height) {
        // Read from input surface
        surf2Dread(&data,  surfObj, x, y);
        // Write to output surface
        data = ~data;
        surf2Dwrite(data, surfObj, x, y);
    }
}

// Copy cudaArray to surface memory and launch the CUDA kernel
void launchFlipSurfaceBitsKernel(
    cudaArray_t *levelArray, 
    int32_t *multiPlanarWidth, 
    int32_t *multiPlanarHeight, 
    int numPlanes) {

    cudaSurfaceObject_t surfObject[numPlanes] = {0};
    cudaResourceDesc resDesc;
    
    for (int i = 0; i < numPlanes; i++) { 
        memset(&resDesc, 0, sizeof(resDesc));
        resDesc.resType = cudaResourceTypeArray;
        resDesc.res.array.array = levelArray[i];
        checkCudaErrors(cudaCreateSurfaceObject(&surfObject[i], &resDesc));
        dim3 threadsperBlock(16, 16);
        dim3 numBlocks((multiPlanarWidth[i] + threadsperBlock.x - 1) / threadsperBlock.x,
                (multiPlanarHeight[i] + threadsperBlock.y - 1) / threadsperBlock.y);
        flipSurfaceBits<<<numBlocks, threadsperBlock>>>(surfObject[i], multiPlanarWidth[i], multiPlanarHeight[i]);
    }
}