mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-28 13:19:14 +08:00
56 lines
2.6 KiB
Plaintext
56 lines
2.6 KiB
Plaintext
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* 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
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
|
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _SIMPLETEXTURE_KERNEL_H_
|
|
#define _SIMPLETEXTURE_KERNEL_H_
|
|
#include <cuda.h>
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//! Transform an image using texture lookups
|
|
//! @param g_odata output data in global memory
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
extern "C" __global__ void transformKernel(float *g_odata, int width,
|
|
int height, float theta,
|
|
CUtexObject tex) {
|
|
// calculate normalized texture coordinates
|
|
unsigned int x = blockIdx.x * blockDim.x + threadIdx.x;
|
|
unsigned int y = blockIdx.y * blockDim.y + threadIdx.y;
|
|
|
|
float u = (float)x - (float)width / 2;
|
|
float v = (float)y - (float)height / 2;
|
|
float tu = u * cosf(theta) - v * sinf(theta);
|
|
float tv = v * cosf(theta) + u * sinf(theta);
|
|
|
|
tu /= (float)width;
|
|
tv /= (float)height;
|
|
|
|
// read from texture and write to global memory
|
|
g_odata[y * width + x] = tex2D<float>(tex, tu + 0.5f, tv + 0.5f);
|
|
}
|
|
|
|
#endif // #ifndef _SIMPLETEXTURE_KERNEL_H_
|