Provided by: nvidia-cuda-dev_7.5.18-0ubuntu1_amd64 
NAME
Texture Object Management -
Functions
CUresult cuTexObjectCreate (CUtexObject *pTexObject, const CUDA_RESOURCE_DESC *pResDesc,
const CUDA_TEXTURE_DESC *pTexDesc, const CUDA_RESOURCE_VIEW_DESC *pResViewDesc)
Creates a texture object.
CUresult cuTexObjectDestroy (CUtexObject texObject)
Destroys a texture object.
CUresult cuTexObjectGetResourceDesc (CUDA_RESOURCE_DESC *pResDesc, CUtexObject texObject)
Returns a texture object's resource descriptor.
CUresult cuTexObjectGetResourceViewDesc (CUDA_RESOURCE_VIEW_DESC *pResViewDesc,
CUtexObject texObject)
Returns a texture object's resource view descriptor.
CUresult cuTexObjectGetTextureDesc (CUDA_TEXTURE_DESC *pTexDesc, CUtexObject texObject)
Returns a texture object's texture descriptor.
Detailed Description
\brief texture object management functions of the low-level CUDA driver API (cuda.h)
This section describes the texture object management functions of the low-level CUDA
driver application programming interface. The texture object API is only supported on
devices of compute capability 3.0 or higher.
Function Documentation
CUresult cuTexObjectCreate (CUtexObject * pTexObject, const CUDA_RESOURCE_DESC * pResDesc,
const CUDA_TEXTURE_DESC * pTexDesc, const CUDA_RESOURCE_VIEW_DESC * pResViewDesc)
Creates a texture object and returns it in pTexObject. pResDesc describes the data to
texture from. pTexDesc describes how the data should be sampled. pResViewDesc is an
optional argument that specifies an alternate format for the data described by pResDesc,
and also describes the subresource region to restrict access to when texturing.
pResViewDesc can only be specified if the type of resource is a CUDA array or a CUDA
mipmapped array.
Texture objects are only supported on devices of compute capability 3.0 or higher.
Additionally, a texture object is an opaque value, and, as such, should only be accessed
through CUDA API calls.
The CUDA_RESOURCE_DESC structure is defined as:
typedef struct CUDA_RESOURCE_DESC_st
{
CUresourcetype resType;
union {
struct {
CUarray hArray;
} array;
struct {
CUmipmappedArray hMipmappedArray;
} mipmap;
struct {
CUdeviceptr devPtr;
CUarray_format format;
unsigned int numChannels;
size_t sizeInBytes;
} linear;
struct {
CUdeviceptr devPtr;
CUarray_format format;
unsigned int numChannels;
size_t width;
size_t height;
size_t pitchInBytes;
} pitch2D;
} res;
unsigned int flags;
} CUDA_RESOURCE_DESC;
where:
• CUDA_RESOURCE_DESC::resType specifies the type of resource to texture from.
CUresourceType is defined as:
typedef enum CUresourcetype_enum {
CU_RESOURCE_TYPE_ARRAY = 0x00,
CU_RESOURCE_TYPE_MIPMAPPED_ARRAY = 0x01,
CU_RESOURCE_TYPE_LINEAR = 0x02,
CU_RESOURCE_TYPE_PITCH2D = 0x03
} CUresourcetype;
.RS 4 If CUDA_RESOURCE_DESC::resType is set to CU_RESOURCE_TYPE_ARRAY,
CUDA_RESOURCE_DESC::res::array::hArray must be set to a valid CUDA array handle.
.RS 4 If CUDA_RESOURCE_DESC::resType is set to CU_RESOURCE_TYPE_MIPMAPPED_ARRAY,
CUDA_RESOURCE_DESC::res::mipmap::hMipmappedArray must be set to a valid CUDA mipmapped
array handle.
.RS 4 If CUDA_RESOURCE_DESC::resType is set to CU_RESOURCE_TYPE_LINEAR,
CUDA_RESOURCE_DESC::res::linear::devPtr must be set to a valid device pointer, that is
aligned to CU_DEVICE_ATTRIBUTE_TEXTURE_ALIGNMENT. CUDA_RESOURCE_DESC::res::linear::format
and CUDA_RESOURCE_DESC::res::linear::numChannels describe the format of each component and
the number of components per array element. CUDA_RESOURCE_DESC::res::linear::sizeInBytes
specifies the size of the array in bytes. The total number of elements in the linear
address range cannot exceed CU_DEVICE_ATTRIBUTE_MAXIMUM_TEXTURE1D_LINEAR_WIDTH. The number
of elements is computed as (sizeInBytes / (sizeof(format) * numChannels)).
.RS 4 If CUDA_RESOURCE_DESC::resType is set to CU_RESOURCE_TYPE_PITCH2D,
CUDA_RESOURCE_DESC::res::pitch2D::devPtr must be set to a valid device pointer, that is
aligned to CU_DEVICE_ATTRIBUTE_TEXTURE_ALIGNMENT. CUDA_RESOURCE_DESC::res::pitch2D::format
and CUDA_RESOURCE_DESC::res::pitch2D::numChannels describe the format of each component
and the number of components per array element. CUDA_RESOURCE_DESC::res::pitch2D::width
and CUDA_RESOURCE_DESC::res::pitch2D::height specify the width and height of the array in
elements, and cannot exceed CU_DEVICE_ATTRIBUTE_MAXIMUM_TEXTURE2D_LINEAR_WIDTH and
CU_DEVICE_ATTRIBUTE_MAXIMUM_TEXTURE2D_LINEAR_HEIGHT respectively.
CUDA_RESOURCE_DESC::res::pitch2D::pitchInBytes specifies the pitch between two rows in
bytes and has to be aligned to CU_DEVICE_ATTRIBUTE_TEXTURE_PITCH_ALIGNMENT. Pitch cannot
exceed CU_DEVICE_ATTRIBUTE_MAXIMUM_TEXTURE2D_LINEAR_PITCH.
• flags must be set to zero.
The CUDA_TEXTURE_DESC struct is defined as
typedef struct CUDA_TEXTURE_DESC_st {
CUaddress_mode addressMode[3];
CUfilter_mode filterMode;
unsigned int flags;
unsigned int maxAnisotropy;
CUfilter_mode mipmapFilterMode;
float mipmapLevelBias;
float minMipmapLevelClamp;
float maxMipmapLevelClamp;
} CUDA_TEXTURE_DESC;
where
• CUDA_TEXTURE_DESC::addressMode specifies the addressing mode for each dimension of the
texture data. CUaddress_mode is defined as:
typedef enum CUaddress_mode_enum {
CU_TR_ADDRESS_MODE_WRAP = 0,
CU_TR_ADDRESS_MODE_CLAMP = 1,
CU_TR_ADDRESS_MODE_MIRROR = 2,
CU_TR_ADDRESS_MODE_BORDER = 3
} CUaddress_mode;
This is ignored if CUDA_RESOURCE_DESC::resType is CU_RESOURCE_TYPE_LINEAR. Also, if the
flag, CU_TRSF_NORMALIZED_COORDINATES is not set, the only supported address mode is
CU_TR_ADDRESS_MODE_CLAMP.
• CUDA_TEXTURE_DESC::filterMode specifies the filtering mode to be used when fetching from
the texture. CUfilter_mode is defined as:
typedef enum CUfilter_mode_enum {
CU_TR_FILTER_MODE_POINT = 0,
CU_TR_FILTER_MODE_LINEAR = 1
} CUfilter_mode;
This is ignored if CUDA_RESOURCE_DESC::resType is CU_RESOURCE_TYPE_LINEAR.
• CUDA_TEXTURE_DESC::flags can be any combination of the following:
• CU_TRSF_READ_AS_INTEGER, which suppresses the default behavior of having the texture
promote integer data to floating point data in the range [0, 1]. Note that texture
with 32-bit integer format would not be promoted, regardless of whether or not this
flag is specified.
• CU_TRSF_NORMALIZED_COORDINATES, which suppresses the default behavior of having the
texture coordinates range from [0, Dim) where Dim is the width or height of the CUDA
array. Instead, the texture coordinates [0, 1.0) reference the entire breadth of the
array dimension; Note that for CUDA mipmapped arrays, this flag has to be set.
• CUDA_TEXTURE_DESC::maxAnisotropy specifies the maximum anisotropy ratio to be used when
doing anisotropic filtering. This value will be clamped to the range [1,16].
• CUDA_TEXTURE_DESC::mipmapFilterMode specifies the filter mode when the calculated mipmap
level lies between two defined mipmap levels.
• CUDA_TEXTURE_DESC::mipmapLevelBias specifies the offset to be applied to the calculated
mipmap level.
• CUDA_TEXTURE_DESC::minMipmapLevelClamp specifies the lower end of the mipmap level range
to clamp access to.
• CUDA_TEXTURE_DESC::maxMipmapLevelClamp specifies the upper end of the mipmap level range
to clamp access to.
The CUDA_RESOURCE_VIEW_DESC struct is defined as
typedef struct CUDA_RESOURCE_VIEW_DESC_st
{
CUresourceViewFormat format;
size_t width;
size_t height;
size_t depth;
unsigned int firstMipmapLevel;
unsigned int lastMipmapLevel;
unsigned int firstLayer;
unsigned int lastLayer;
} CUDA_RESOURCE_VIEW_DESC;
where:
• CUDA_RESOURCE_VIEW_DESC::format specifies how the data contained in the CUDA array or
CUDA mipmapped array should be interpreted. Note that this can incur a change in size of
the texture data. If the resource view format is a block compressed format, then the
underlying CUDA array or CUDA mipmapped array has to have a base of format
CU_AD_FORMAT_UNSIGNED_INT32. with 2 or 4 channels, depending on the block compressed
format. For ex., BC1 and BC4 require the underlying CUDA array to have a format of
CU_AD_FORMAT_UNSIGNED_INT32 with 2 channels. The other BC formats require the underlying
resource to have the same base format but with 4 channels.
• CUDA_RESOURCE_VIEW_DESC::width specifies the new width of the texture data. If the
resource view format is a block compressed format, this value has to be 4 times the
original width of the resource. For non block compressed formats, this value has to be
equal to that of the original resource.
• CUDA_RESOURCE_VIEW_DESC::height specifies the new height of the texture data. If the
resource view format is a block compressed format, this value has to be 4 times the
original height of the resource. For non block compressed formats, this value has to be
equal to that of the original resource.
• CUDA_RESOURCE_VIEW_DESC::depth specifies the new depth of the texture data. This value
has to be equal to that of the original resource.
• CUDA_RESOURCE_VIEW_DESC::firstMipmapLevel specifies the most detailed mipmap level. This
will be the new mipmap level zero. For non-mipmapped resources, this value has to be
zero.CUDA_TEXTURE_DESC::minMipmapLevelClamp and CUDA_TEXTURE_DESC::maxMipmapLevelClamp
will be relative to this value. For ex., if the firstMipmapLevel is set to 2, and a
minMipmapLevelClamp of 1.2 is specified, then the actual minimum mipmap level clamp will
be 3.2.
• CUDA_RESOURCE_VIEW_DESC::lastMipmapLevel specifies the least detailed mipmap level. For
non-mipmapped resources, this value has to be zero.
• CUDA_RESOURCE_VIEW_DESC::firstLayer specifies the first layer index for layered
textures. This will be the new layer zero. For non-layered resources, this value has to
be zero.
• CUDA_RESOURCE_VIEW_DESC::lastLayer specifies the last layer index for layered textures.
For non-layered resources, this value has to be zero.
Parameters:
pTexObject - Texture object to create
pResDesc - Resource descriptor
pTexDesc - Texture descriptor
pResViewDesc - Resource view descriptor
Returns:
CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
See also:
cuTexObjectDestroy
CUresult cuTexObjectDestroy (CUtexObject texObject)
Destroys the texture object specified by texObject.
Parameters:
texObject - Texture object to destroy
Returns:
CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
See also:
cuTexObjectCreate
CUresult cuTexObjectGetResourceDesc (CUDA_RESOURCE_DESC * pResDesc, CUtexObject texObject)
Returns the resource descriptor for the texture object specified by texObject.
Parameters:
pResDesc - Resource descriptor
texObject - Texture object
Returns:
CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
See also:
cuTexObjectCreate
CUresult cuTexObjectGetResourceViewDesc (CUDA_RESOURCE_VIEW_DESC * pResViewDesc, CUtexObject
texObject)
Returns the resource view descriptor for the texture object specified by texObject. If no
resource view was set for texObject, the CUDA_ERROR_INVALID_VALUE is returned.
Parameters:
pResViewDesc - Resource view descriptor
texObject - Texture object
Returns:
CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
See also:
cuTexObjectCreate
CUresult cuTexObjectGetTextureDesc (CUDA_TEXTURE_DESC * pTexDesc, CUtexObject texObject)
Returns the texture descriptor for the texture object specified by texObject.
Parameters:
pTexDesc - Texture descriptor
texObject - Texture object
Returns:
CUDA_SUCCESS, CUDA_ERROR_DEINITIALIZED, CUDA_ERROR_NOT_INITIALIZED,
CUDA_ERROR_INVALID_CONTEXT, CUDA_ERROR_INVALID_VALUE
See also:
cuTexObjectCreate
Author
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