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nvc_texture.h
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Sun, Oct 6, 22:58
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rLAMMPS lammps
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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