1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/* Copyright (c) 2022, 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.
*/
#include <cuda.h>
#include <helper_cuda.h>
#include <helper_image.h>
// convert floating point rgba color to 32-bit integer
__device__ unsigned int rgbaFloatToInt(float4 rgba) {
rgba.x = __saturatef(rgba.x); // clamp to [0.0, 1.0]
rgba.y = __saturatef(rgba.y);
rgba.z = __saturatef(rgba.z);
rgba.w = __saturatef(rgba.w);
return ((unsigned int)(rgba.w * 255.0f) << 24) |
((unsigned int)(rgba.z * 255.0f) << 16) |
((unsigned int)(rgba.y * 255.0f) << 8) |
((unsigned int)(rgba.x * 255.0f));
}
////////////////////////////////////////////////////////////////////////////////
//! Rotate an image using texture lookups
//! @param outputData output data in global memory
////////////////////////////////////////////////////////////////////////////////
static __global__ void transformKernel(unsigned int *outputData, int width,
int height, float theta,
cudaTextureObject_t 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
float4 pix = tex2D<float4>(tex, tu + 0.5f, tv + 0.5f);
unsigned int pixelInt = rgbaFloatToInt(pix);
outputData[y * width + x] = pixelInt;
}
static __global__ void rgbToGrayscaleKernel(unsigned int *rgbaImage,
size_t imageWidth,
size_t imageHeight) {
size_t gidX = blockDim.x * blockIdx.x + threadIdx.x;
uchar4 *pixArray = (uchar4 *)rgbaImage;
for (int pixId = gidX; pixId < imageWidth * imageHeight;
pixId += gridDim.x * blockDim.x) {
uchar4 dataA = pixArray[pixId];
unsigned char grayscale =
(unsigned char)(dataA.x * 0.3 + dataA.y * 0.59 + dataA.z * 0.11);
uchar4 dataB = make_uchar4(grayscale, grayscale, grayscale, 0);
pixArray[pixId] = dataB;
}
}
void launchGrayScaleKernel(unsigned int *d_rgbaImage,
std::string image_filename, size_t imageWidth,
size_t imageHeight, cudaStream_t stream) {
int numThreadsPerBlock = 1024;
int numOfBlocks = (imageWidth * imageHeight) / numThreadsPerBlock;
rgbToGrayscaleKernel<<<numOfBlocks, numThreadsPerBlock, 0, stream>>>(
d_rgbaImage, imageWidth, imageHeight);
unsigned int *outputData;
checkCudaErrors(cudaMallocHost((void**)&outputData, sizeof(unsigned int) * imageWidth * imageHeight));
checkCudaErrors(cudaMemcpyAsync(
outputData, d_rgbaImage, sizeof(unsigned int) * imageWidth * imageHeight,
cudaMemcpyDeviceToHost, stream));
checkCudaErrors(cudaStreamSynchronize(stream));
char outputFilename[1024];
strcpy(outputFilename, image_filename.c_str());
strcpy(outputFilename + image_filename.length() - 4, "_out.ppm");
sdkSavePPM4ub(outputFilename, (unsigned char *)outputData, imageWidth,
imageHeight);
printf("Wrote '%s'\n", outputFilename);
checkCudaErrors(cudaFreeHost(outputData));
}
void rotateKernel(cudaTextureObject_t &texObj, const float angle,
unsigned int *d_outputData, const int imageWidth,
const int imageHeight, cudaStream_t stream) {
dim3 dimBlock(8, 8, 1);
dim3 dimGrid(imageWidth / dimBlock.x, imageHeight / dimBlock.y, 1);
transformKernel<<<dimGrid, dimBlock, 0, stream>>>(d_outputData, imageWidth,
imageHeight, angle, texObj);
}
|
