convolutionFFT2D_gold.cpp

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#include <assert.h>
#include "convolutionFFT2D_common.h"

////////////////////////////////////////////////////////////////////////////////
// Reference straightforward CPU convolution
////////////////////////////////////////////////////////////////////////////////
extern "C" void convolutionClampToBorderCPU(float *h_Result, float *h_Data,
                                            float *h_Kernel, int dataH,
                                            int dataW, int kernelH, int kernelW,
                                            int kernelY, int kernelX) {
  for (int y = 0; y < dataH; y++)
    for (int x = 0; x < dataW; x++) {
      double sum = 0;

      for (int ky = -(kernelH - kernelY - 1); ky <= kernelY; ky++)
        for (int kx = -(kernelW - kernelX - 1); kx <= kernelX; kx++) {
          int dy = y + ky;
          int dx = x + kx;

          if (dy < 0) dy = 0;

          if (dx < 0) dx = 0;

          if (dy >= dataH) dy = dataH - 1;

          if (dx >= dataW) dx = dataW - 1;

          sum += h_Data[dy * dataW + dx] *
                 h_Kernel[(kernelY - ky) * kernelW + (kernelX - kx)];
        }

      h_Result[y * dataW + x] = (float)sum;
    }
}