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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