| // Copyright (c) 2022, ETH Zurich and UNC Chapel Hill. | |
| // 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 | |
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| // | |
| // * 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 ETH Zurich and UNC Chapel Hill 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 AND CONTRIBUTORS "AS IS" | |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
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| // | |
| // Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de) | |
| #include "mvs/gpu_mat_prng.h" | |
| namespace colmap { | |
| namespace mvs { | |
| namespace { | |
| __global__ void InitRandomStateKernel(GpuMat<curandState> output) { | |
| const size_t row = blockIdx.y * blockDim.y + threadIdx.y; | |
| const size_t col = blockIdx.x * blockDim.x + threadIdx.x; | |
| const size_t uniqueBlockIndex = blockIdx.y * gridDim.x + blockIdx.x; | |
| const size_t id = uniqueBlockIndex * blockDim.y * blockDim.x + | |
| threadIdx.y * blockDim.x + threadIdx.x; | |
| // Each thread gets same seed, a different sequence number, no offset. | |
| if (col < output.GetWidth() && row < output.GetHeight()) { | |
| curand_init(id, 0, 0, &output.GetRef(row, col)); | |
| } | |
| } | |
| } // namespace | |
| GpuMatPRNG::GpuMatPRNG(const int width, const int height) | |
| : GpuMat(width, height) { | |
| InitRandomStateKernel<<<gridSize_, blockSize_>>>(*this); | |
| } | |
| } // namespace mvs | |
| } // namespace colmap | |