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https://github.com/NVIDIA/cuda-samples.git
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84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
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/* Copyright (c) 2021, 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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#ifndef _VOLUME_H_
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#define _VOLUME_H_
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#include <cuda_runtime.h>
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typedef unsigned char VolumeType;
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extern "C" {
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struct Volume {
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cudaArray *content;
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cudaExtent size;
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cudaChannelFormatDesc channelDesc;
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cudaTextureObject_t volumeTex;
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cudaSurfaceObject_t volumeSurf;
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};
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void Volume_init(Volume *vol, cudaExtent size, void *data, int allowStore);
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void Volume_deinit(Volume *vol);
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};
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//////////////////////////////////////////////////////////////////////////
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#ifdef __CUDACC__
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/* Helper class to do popular integer storage to float conversions if required
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*/
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template <typename T>
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struct VolumeTypeInfo {};
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template <>
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struct VolumeTypeInfo<unsigned char> {
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static const cudaTextureReadMode readMode = cudaReadModeNormalizedFloat;
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static __inline__ __device__ unsigned char convert(float sampled) {
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return (unsigned char)(saturate(sampled) * 255.0);
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}
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};
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template <>
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struct VolumeTypeInfo<unsigned short> {
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static const cudaTextureReadMode readMode = cudaReadModeNormalizedFloat;
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static __inline__ __device__ unsigned short convert(float sampled) {
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return (unsigned short)(saturate(sampled) * 65535.0);
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}
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};
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template <>
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struct VolumeTypeInfo<float> {
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static const cudaTextureReadMode readMode = cudaReadModeElementType;
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static __inline__ __device__ float convert(float sampled) { return sampled; }
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};
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#endif
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#endif
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