Provided by: nvidia-cuda-dev_9.1.85-3ubuntu1_amd64 
NAME
Texture Object Management -
Functions
cudaError_t cudaCreateTextureObject (cudaTextureObject_t *pTexObject, const struct
cudaResourceDesc *pResDesc, const struct cudaTextureDesc *pTexDesc, const struct
cudaResourceViewDesc *pResViewDesc)
Creates a texture object.
cudaError_t cudaDestroyTextureObject (cudaTextureObject_t texObject)
Destroys a texture object.
cudaError_t cudaGetTextureObjectResourceDesc (struct cudaResourceDesc *pResDesc,
cudaTextureObject_t texObject)
Returns a texture object's resource descriptor.
cudaError_t cudaGetTextureObjectResourceViewDesc (struct cudaResourceViewDesc
*pResViewDesc, cudaTextureObject_t texObject)
Returns a texture object's resource view descriptor.
cudaError_t cudaGetTextureObjectTextureDesc (struct cudaTextureDesc *pTexDesc,
cudaTextureObject_t texObject)
Returns a texture object's texture descriptor.
Detailed Description
\brief texture object management functions of the CUDA runtime API (cuda_runtime_api.h)
This section describes the low level texture object management functions of the CUDA
runtime application programming interface. The texture object API is only supported on
devices of compute capability 3.0 or higher.
Function Documentation
cudaError_t cudaCreateTextureObject (cudaTextureObject_t * pTexObject, const struct
cudaResourceDesc * pResDesc, const struct cudaTextureDesc * pTexDesc, const struct
cudaResourceViewDesc * 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 cudaResourceDesc structure is defined as:
struct cudaResourceDesc {
enum cudaResourceType resType;
union {
struct {
cudaArray_t array;
} array;
struct {
cudaMipmappedArray_t mipmap;
} mipmap;
struct {
void *devPtr;
struct cudaChannelFormatDesc desc;
size_t sizeInBytes;
} linear;
struct {
void *devPtr;
struct cudaChannelFormatDesc desc;
size_t width;
size_t height;
size_t pitchInBytes;
} pitch2D;
} res;
};
where:
• cudaResourceDesc::resType specifies the type of resource to texture from. CUresourceType
is defined as:
enum cudaResourceType {
cudaResourceTypeArray = 0x00,
cudaResourceTypeMipmappedArray = 0x01,
cudaResourceTypeLinear = 0x02,
cudaResourceTypePitch2D = 0x03
};
.RS 4 If cudaResourceDesc::resType is set to cudaResourceTypeArray,
cudaResourceDesc::res::array::array must be set to a valid CUDA array handle.
.RS 4 If cudaResourceDesc::resType is set to cudaResourceTypeMipmappedArray,
cudaResourceDesc::res::mipmap::mipmap must be set to a valid CUDA mipmapped array handle
and cudaTextureDesc::normalizedCoords must be set to true.
.RS 4 If cudaResourceDesc::resType is set to cudaResourceTypeLinear,
cudaResourceDesc::res::linear::devPtr must be set to a valid device pointer, that is
aligned to cudaDeviceProp::textureAlignment. cudaResourceDesc::res::linear::desc describes
the format and the number of components per array element.
cudaResourceDesc::res::linear::sizeInBytes specifies the size of the array in bytes. The
total number of elements in the linear address range cannot exceed
cudaDeviceProp::maxTexture1DLinear. The number of elements is computed as (sizeInBytes /
sizeof(desc)).
.RS 4 If cudaResourceDesc::resType is set to cudaResourceTypePitch2D,
cudaResourceDesc::res::pitch2D::devPtr must be set to a valid device pointer, that is
aligned to cudaDeviceProp::textureAlignment. cudaResourceDesc::res::pitch2D::desc
describes the format and the number of components per array element.
cudaResourceDesc::res::pitch2D::width and cudaResourceDesc::res::pitch2D::height specify
the width and height of the array in elements, and cannot exceed
cudaDeviceProp::maxTexture2DLinear[0] and cudaDeviceProp::maxTexture2DLinear[1]
respectively. cudaResourceDesc::res::pitch2D::pitchInBytes specifies the pitch between two
rows in bytes and has to be aligned to cudaDeviceProp::texturePitchAlignment. Pitch cannot
exceed cudaDeviceProp::maxTexture2DLinear[2].
The cudaTextureDesc struct is defined as
struct cudaTextureDesc {
enum cudaTextureAddressMode addressMode[3];
enum cudaTextureFilterMode filterMode;
enum cudaTextureReadMode readMode;
int sRGB;
float borderColor[4];
int normalizedCoords;
unsigned int maxAnisotropy;
enum cudaTextureFilterMode mipmapFilterMode;
float mipmapLevelBias;
float minMipmapLevelClamp;
float maxMipmapLevelClamp;
};
where
• cudaTextureDesc::addressMode specifies the addressing mode for each dimension of the
texture data. cudaTextureAddressMode is defined as:
enum cudaTextureAddressMode {
cudaAddressModeWrap = 0,
cudaAddressModeClamp = 1,
cudaAddressModeMirror = 2,
cudaAddressModeBorder = 3
};
This is ignored if cudaResourceDesc::resType is cudaResourceTypeLinear. Also, if
cudaTextureDesc::normalizedCoords is set to zero, cudaAddressModeWrap and
cudaAddressModeMirror won't be supported and will be switched to cudaAddressModeClamp.
• cudaTextureDesc::filterMode specifies the filtering mode to be used when fetching from
the texture. cudaTextureFilterMode is defined as:
enum cudaTextureFilterMode {
cudaFilterModePoint = 0,
cudaFilterModeLinear = 1
};
This is ignored if cudaResourceDesc::resType is cudaResourceTypeLinear.
• cudaTextureDesc::readMode specifies whether integer data should be converted to floating
point or not. cudaTextureReadMode is defined as:
enum cudaTextureReadMode {
cudaReadModeElementType = 0,
cudaReadModeNormalizedFloat = 1
};
Note that this applies only to 8-bit and 16-bit integer formats. 32-bit integer format
would not be promoted, regardless of whether or not this cudaTextureDesc::readMode is set
cudaReadModeNormalizedFloat is specified.
• cudaTextureDesc::sRGB specifies whether sRGB to linear conversion should be performed
during texture fetch.
• cudaTextureDesc::borderColor specifies the float values of color. where:
cudaTextureDesc::borderColor[0] contains value of 'R', cudaTextureDesc::borderColor[1]
contains value of 'G', cudaTextureDesc::borderColor[2] contains value of 'B',
cudaTextureDesc::borderColor[3] contains value of 'A' Note that application using
integer border color values will need to <reinterpret_cast> these values to float. The
values are set only when the addressing mode specified by cudaTextureDesc::addressMode
is cudaAddressModeBorder.
• cudaTextureDesc::normalizedCoords specifies whether the texture coordinates will be
normalized or not.
• cudaTextureDesc::maxAnisotropy specifies the maximum anistropy ratio to be used when
doing anisotropic filtering. This value will be clamped to the range [1,16].
• cudaTextureDesc::mipmapFilterMode specifies the filter mode when the calculated mipmap
level lies between two defined mipmap levels.
• cudaTextureDesc::mipmapLevelBias specifies the offset to be applied to the calculated
mipmap level.
• cudaTextureDesc::minMipmapLevelClamp specifies the lower end of the mipmap level range
to clamp access to.
• cudaTextureDesc::maxMipmapLevelClamp specifies the upper end of the mipmap level range
to clamp access to.
The cudaResourceViewDesc struct is defined as
struct cudaResourceViewDesc {
enum cudaResourceViewFormat format;
size_t width;
size_t height;
size_t depth;
unsigned int firstMipmapLevel;
unsigned int lastMipmapLevel;
unsigned int firstLayer;
unsigned int lastLayer;
};
where:
• cudaResourceViewDesc::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 32-bit unsigned integer
format with 2 or 4 channels, depending on the block compressed format. For ex., BC1 and
BC4 require the underlying CUDA array to have a 32-bit unsigned int with 2 channels. The
other BC formats require the underlying resource to have the same 32-bit unsigned int
format but with 4 channels.
• cudaResourceViewDesc::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.
• cudaResourceViewDesc::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.
• cudaResourceViewDesc::depth specifies the new depth of the texture data. This value has
to be equal to that of the original resource.
• cudaResourceViewDesc::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.cudaTextureDesc::minMipmapLevelClamp and cudaTextureDesc::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.
• cudaResourceViewDesc::lastMipmapLevel specifies the least detailed mipmap level. For
non-mipmapped resources, this value has to be zero.
• cudaResourceViewDesc::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.
• cudaResourceViewDesc::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:
cudaSuccess, cudaErrorInvalidValue
See also:
cudaDestroyTextureObject, cuTexObjectCreate
cudaError_t cudaDestroyTextureObject (cudaTextureObject_t texObject)
Destroys the texture object specified by texObject.
Parameters:
texObject - Texture object to destroy
Returns:
cudaSuccess, cudaErrorInvalidValue
See also:
cudaCreateTextureObject, cuTexObjectDestroy
cudaError_t cudaGetTextureObjectResourceDesc (struct cudaResourceDesc * pResDesc,
cudaTextureObject_t texObject)
Returns the resource descriptor for the texture object specified by texObject.
Parameters:
pResDesc - Resource descriptor
texObject - Texture object
Returns:
cudaSuccess, cudaErrorInvalidValue
See also:
cudaCreateTextureObject, cuTexObjectGetResourceDesc
cudaError_t cudaGetTextureObjectResourceViewDesc (struct cudaResourceViewDesc * pResViewDesc,
cudaTextureObject_t texObject)
Returns the resource view descriptor for the texture object specified by texObject. If no
resource view was specified, cudaErrorInvalidValue is returned.
Parameters:
pResViewDesc - Resource view descriptor
texObject - Texture object
Returns:
cudaSuccess, cudaErrorInvalidValue
See also:
cudaCreateTextureObject, cuTexObjectGetResourceViewDesc
cudaError_t cudaGetTextureObjectTextureDesc (struct cudaTextureDesc * pTexDesc,
cudaTextureObject_t texObject)
Returns the texture descriptor for the texture object specified by texObject.
Parameters:
pTexDesc - Texture descriptor
texObject - Texture object
Returns:
cudaSuccess, cudaErrorInvalidValue
See also:
cudaCreateTextureObject, cuTexObjectGetTextureDesc
Author
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