cuda-samples/Samples/HSOpticalFlow/upscaleKernel.cuh
2021-10-21 16:34:49 +05:30

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/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
*
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#include "common.h"
///////////////////////////////////////////////////////////////////////////////
/// \brief upscale one component of a displacement field, CUDA kernel
/// \param[in] width field width
/// \param[in] height field height
/// \param[in] stride field stride
/// \param[in] scale scale factor (multiplier)
/// \param[out] out result
///////////////////////////////////////////////////////////////////////////////
__global__ void UpscaleKernel(int width, int height, int stride, float scale,
float *out, cudaTextureObject_t texCoarse) {
const int ix = threadIdx.x + blockIdx.x * blockDim.x;
const int iy = threadIdx.y + blockIdx.y * blockDim.y;
if (ix >= width || iy >= height) return;
float x = ((float)ix + 0.5f) / (float)width;
float y = ((float)iy + 0.5f) / (float)height;
// exploit hardware interpolation
// and scale interpolated vector to match next pyramid level resolution
out[ix + iy * stride] = tex2D<float>(texCoarse, x, y) * scale;
}
///////////////////////////////////////////////////////////////////////////////
/// \brief upscale one component of a displacement field, kernel wrapper
/// \param[in] src field component to upscale
/// \param[in] width field current width
/// \param[in] height field current height
/// \param[in] stride field current stride
/// \param[in] newWidth field new width
/// \param[in] newHeight field new height
/// \param[in] newStride field new stride
/// \param[in] scale value scale factor (multiplier)
/// \param[out] out upscaled field component
///////////////////////////////////////////////////////////////////////////////
static void Upscale(const float *src, int width, int height, int stride,
int newWidth, int newHeight, int newStride, float scale,
float *out) {
dim3 threads(32, 8);
dim3 blocks(iDivUp(newWidth, threads.x), iDivUp(newHeight, threads.y));
cudaTextureObject_t texCoarse;
cudaResourceDesc texRes;
memset(&texRes, 0, sizeof(cudaResourceDesc));
texRes.resType = cudaResourceTypePitch2D;
texRes.res.pitch2D.devPtr = (void *)src;
texRes.res.pitch2D.desc = cudaCreateChannelDesc<float>();
texRes.res.pitch2D.width = width;
texRes.res.pitch2D.height = height;
texRes.res.pitch2D.pitchInBytes = stride * sizeof(float);
cudaTextureDesc texDescr;
memset(&texDescr, 0, sizeof(cudaTextureDesc));
texDescr.normalizedCoords = true;
texDescr.filterMode = cudaFilterModeLinear;
texDescr.addressMode[0] = cudaAddressModeMirror;
texDescr.addressMode[1] = cudaAddressModeMirror;
texDescr.readMode = cudaReadModeElementType;
checkCudaErrors(
cudaCreateTextureObject(&texCoarse, &texRes, &texDescr, NULL));
UpscaleKernel<<<blocks, threads>>>(newWidth, newHeight, newStride, scale, out,
texCoarse);
}