cuda-samples/Samples/2_Concepts_and_Techniques/imageDenoising/imageDenoising_copy_kernel.cuh

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2022-01-13 14:05:24 +08:00
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
2021-10-21 19:04:49 +08:00
*
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* modification, are permitted provided that the following conditions
* are met:
* * 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
* documentation and/or other materials provided with the distribution.
* * Neither the name of NVIDIA CORPORATION nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*/
__global__ void Copy(TColor *dst, int imageW, int imageH,
cudaTextureObject_t texImage) {
const int ix = blockDim.x * blockIdx.x + threadIdx.x;
const int iy = blockDim.y * blockIdx.y + threadIdx.y;
// Add half of a texel to always address exact texel centers
const float x = (float)ix + 0.5f;
const float y = (float)iy + 0.5f;
if (ix < imageW && iy < imageH) {
float4 fresult = tex2D<float4>(texImage, x, y);
dst[imageW * iy + ix] = make_color(fresult.x, fresult.y, fresult.z, 0);
}
}
extern "C" void cuda_Copy(TColor *d_dst, int imageW, int imageH,
cudaTextureObject_t texImage) {
dim3 threads(BLOCKDIM_X, BLOCKDIM_Y);
dim3 grid(iDivUp(imageW, BLOCKDIM_X), iDivUp(imageH, BLOCKDIM_Y));
Copy<<<grid, threads>>>(d_dst, imageW, imageH, texImage);
}