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121 lines
5.2 KiB
Plaintext
121 lines
5.2 KiB
Plaintext
/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <cuda.h>
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#include <helper_cuda.h>
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#include <helper_image.h>
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// convert floating point rgba color to 32-bit integer
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__device__ unsigned int rgbaFloatToInt(float4 rgba) {
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rgba.x = __saturatef(rgba.x); // clamp to [0.0, 1.0]
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rgba.y = __saturatef(rgba.y);
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rgba.z = __saturatef(rgba.z);
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rgba.w = __saturatef(rgba.w);
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return ((unsigned int)(rgba.w * 255.0f) << 24) |
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((unsigned int)(rgba.z * 255.0f) << 16) |
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((unsigned int)(rgba.y * 255.0f) << 8) |
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((unsigned int)(rgba.x * 255.0f));
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}
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////////////////////////////////////////////////////////////////////////////////
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//! Rotate an image using texture lookups
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//! @param outputData output data in global memory
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////////////////////////////////////////////////////////////////////////////////
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static __global__ void transformKernel(unsigned int *outputData, int width,
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int height, float theta,
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cudaTextureObject_t tex) {
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// calculate normalized texture coordinates
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unsigned int x = blockIdx.x * blockDim.x + threadIdx.x;
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unsigned int y = blockIdx.y * blockDim.y + threadIdx.y;
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float u = (float)x - (float)width / 2;
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float v = (float)y - (float)height / 2;
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float tu = u * cosf(theta) - v * sinf(theta);
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float tv = v * cosf(theta) + u * sinf(theta);
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tu /= (float)width;
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tv /= (float)height;
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// read from texture and write to global memory
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float4 pix = tex2D<float4>(tex, tu + 0.5f, tv + 0.5f);
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unsigned int pixelInt = rgbaFloatToInt(pix);
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outputData[y * width + x] = pixelInt;
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}
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static __global__ void rgbToGrayscaleKernel(unsigned int *rgbaImage,
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size_t imageWidth,
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size_t imageHeight) {
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size_t gidX = blockDim.x * blockIdx.x + threadIdx.x;
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uchar4 *pixArray = (uchar4 *)rgbaImage;
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for (int pixId = gidX; pixId < imageWidth * imageHeight;
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pixId += gridDim.x * blockDim.x) {
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uchar4 dataA = pixArray[pixId];
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unsigned char grayscale =
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(unsigned char)(dataA.x * 0.3 + dataA.y * 0.59 + dataA.z * 0.11);
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uchar4 dataB = make_uchar4(grayscale, grayscale, grayscale, 0);
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pixArray[pixId] = dataB;
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}
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}
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void launchGrayScaleKernel(unsigned int *d_rgbaImage,
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std::string image_filename, size_t imageWidth,
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size_t imageHeight, cudaStream_t stream) {
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int numThreadsPerBlock = 1024;
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int numOfBlocks = (imageWidth * imageHeight) / numThreadsPerBlock;
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rgbToGrayscaleKernel<<<numOfBlocks, numThreadsPerBlock, 0, stream>>>(
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d_rgbaImage, imageWidth, imageHeight);
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unsigned int *outputData;
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checkCudaErrors(cudaMallocHost((void**)&outputData, sizeof(unsigned int) * imageWidth * imageHeight));
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checkCudaErrors(cudaMemcpyAsync(
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outputData, d_rgbaImage, sizeof(unsigned int) * imageWidth * imageHeight,
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cudaMemcpyDeviceToHost, stream));
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checkCudaErrors(cudaStreamSynchronize(stream));
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char outputFilename[1024];
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strcpy(outputFilename, image_filename.c_str());
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strcpy(outputFilename + image_filename.length() - 4, "_out.ppm");
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sdkSavePPM4ub(outputFilename, (unsigned char *)outputData, imageWidth,
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imageHeight);
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printf("Wrote '%s'\n", outputFilename);
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checkCudaErrors(cudaFreeHost(outputData));
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}
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void rotateKernel(cudaTextureObject_t &texObj, const float angle,
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unsigned int *d_outputData, const int imageWidth,
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const int imageHeight, cudaStream_t stream) {
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dim3 dimBlock(8, 8, 1);
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dim3 dimGrid(imageWidth / dimBlock.x, imageHeight / dimBlock.y, 1);
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transformKernel<<<dimGrid, dimBlock, 0, stream>>>(d_outputData, imageWidth,
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imageHeight, angle, texObj);
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}
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