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lammps/lib/gpu/geryon/nvc_texture.h
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nvc_texture.h
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/***************************************************************************
nvc_texture.h
-------------------
W. Michael Brown
Utilities for dealing with CUDA Runtime textures
__________________________________________________________________________
This file is part of the Geryon Unified Coprocessor Library (UCL)
__________________________________________________________________________
begin : Fri Jul 2 2010
copyright : (C) 2010 by W. Michael Brown
email : brownw@ornl.gov
***************************************************************************/
/* -----------------------------------------------------------------------
Copyright (2010) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the Simplified BSD License.
----------------------------------------------------------------------- */
#ifndef NVC_TEXTURE
#define NVC_TEXTURE
#include "nvc_mat.h"
namespace ucl_cudart {
/// Class storing a texture reference
class UCL_Texture {
public:
UCL_Texture() {}
~UCL_Texture() {}
/// Construct with a specified texture reference
inline UCL_Texture(textureReference *t) { get_texture(t); }
/// Set the texture reference for this object
inline void get_texture(textureReference *t) { _tex_ptr=t; }
/// Bind a float array where each fetch grabs a vector of length numel
template<class mat_typ>
inline void bind_float(mat_typ &vec, const unsigned numel) {
#ifdef UCL_DEBUG
assert(numel!=0 && numel<5);
#endif
int bits[4]={0,0,0,0};
for (int i=0; i<numel; i++) bits[i]=32;
_channel = cudaCreateChannelDesc(bits[0], bits[1], bits[2], bits[3],
cudaChannelFormatKindFloat);
(*_tex_ptr).addressMode[0] = cudaAddressModeClamp;
(*_tex_ptr).addressMode[1] = cudaAddressModeClamp;
(*_tex_ptr).filterMode = cudaFilterModePoint;
(*_tex_ptr).normalized = false;
CUDA_SAFE_CALL(cudaBindTexture(NULL,_tex_ptr,vec.cbegin(),&_channel));
}
/// Unbind the texture reference from the memory allocation
inline void unbind() { CUDA_SAFE_CALL(cudaUnbindTexture(_tex_ptr)); }
private:
textureReference *_tex_ptr;
cudaChannelFormatDesc _channel;
};
} // namespace
#endif
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