cuda-samples/Samples/simpleTextureDrv/simpleTexture_kernel.cu

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2021-10-21 19:04:49 +08:00
/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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#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_