cudaGetChannelDesc (3)
NAME
Texture Reference Management -Functions
cudaError_t cudaBindTexture (size_t *offset, const struct textureReference *texref, const void *devPtr, const struct cudaChannelFormatDesc *desc, size_t size=UINT_MAX)
Binds a memory area to a texture.
cudaError_t cudaBindTexture2D (size_t *offset, const struct textureReference *texref, const void *devPtr, const struct cudaChannelFormatDesc *desc, size_t width, size_t height, size_t pitch)
Binds a 2D memory area to a texture.
cudaError_t cudaBindTextureToArray (const struct textureReference *texref, cudaArray_const_t array, const struct cudaChannelFormatDesc *desc)
Binds an array to a texture.
cudaError_t cudaBindTextureToMipmappedArray (const struct textureReference *texref, cudaMipmappedArray_const_t mipmappedArray, const struct cudaChannelFormatDesc *desc)
Binds a mipmapped array to a texture.
struct cudaChannelFormatDesc cudaCreateChannelDesc (int x, int y, int z, int w, enum cudaChannelFormatKind f)
Returns a channel descriptor using the specified format.
cudaError_t cudaGetChannelDesc (struct cudaChannelFormatDesc *desc, cudaArray_const_t array)
Get the channel descriptor of an array.
cudaError_t cudaGetTextureAlignmentOffset (size_t *offset, const struct textureReference *texref)
Get the alignment offset of a texture.
cudaError_t cudaGetTextureReference (const struct textureReference **texref, const void *symbol)
Get the texture reference associated with a symbol.
cudaError_t cudaUnbindTexture (const struct textureReference *texref)
Unbinds a texture.
Detailed Description
\brief texture reference management functions of the CUDA runtime API (cuda_runtime_api.h)
This section describes the low level texture reference management functions of the CUDA runtime application programming interface.
Some functions have overloaded C++ API template versions documented separately in the C++ API Routines module.
Function Documentation
cudaError_t cudaBindTexture (size_t * offset, const struct textureReference * texref, const void * devPtr, const struct cudaChannelFormatDesc * desc, size_t size = UINT_MAX)
Binds size bytes of the memory area pointed to by devPtr to the texture reference texref. desc describes how the memory is interpreted when fetching values from the texture. Any memory previously bound to texref is unbound.
Since the hardware enforces an alignment requirement on texture base addresses, cudaBindTexture() returns in *offset a byte offset that must be applied to texture fetches in order to read from the desired memory. This offset must be divided by the texel size and passed to kernels that read from the texture so they can be applied to the tex1Dfetch() function. If the device memory pointer was returned from cudaMalloc(), the offset is guaranteed to be 0 and NULL may be passed as the offset parameter.
The total number of elements (or texels) in the linear address range cannot exceed cudaDeviceProp::maxTexture1DLinear[0]. The number of elements is computed as (size / elementSize), where elementSize is determined from desc.
Parameters:
-
offset - Offset in bytes
texref - Texture to bind
devPtr - Memory area on device
desc - Channel format
size - Size of the memory area pointed to by devPtr
Returns:
- cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C++ API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C API)
cudaError_t cudaBindTexture2D (size_t * offset, const struct textureReference * texref, const void * devPtr, const struct cudaChannelFormatDesc * desc, size_t width, size_t height, size_t pitch)
Binds the 2D memory area pointed to by devPtr to the texture reference texref. The size of the area is constrained by width in texel units, height in texel units, and pitch in byte units. desc describes how the memory is interpreted when fetching values from the texture. Any memory previously bound to texref is unbound.
Since the hardware enforces an alignment requirement on texture base addresses, cudaBindTexture2D() returns in *offset a byte offset that must be applied to texture fetches in order to read from the desired memory. This offset must be divided by the texel size and passed to kernels that read from the texture so they can be applied to the tex2D() function. If the device memory pointer was returned from cudaMalloc(), the offset is guaranteed to be 0 and NULL may be passed as the offset parameter.
width and height, which are specified in elements (or texels), cannot exceed cudaDeviceProp::maxTexture2DLinear[0] and cudaDeviceProp::maxTexture2DLinear[1] respectively. pitch, which is specified in bytes, cannot exceed cudaDeviceProp::maxTexture2DLinear[2].
The driver returns cudaErrorInvalidValue if pitch is not a multiple of cudaDeviceProp::texturePitchAlignment.
Parameters:
-
offset - Offset in bytes
texref - Texture reference to bind
devPtr - 2D memory area on device
desc - Channel format
width - Width in texel units
height - Height in texel units
pitch - Pitch in bytes
Returns:
- cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C++ API), cudaBindTexture2D (C++ API, inherited channel descriptor), cudaBindTextureToArray (C API), cudaBindTextureToArray (C API), cudaGetTextureAlignmentOffset (C API)
cudaError_t cudaBindTextureToArray (const struct textureReference * texref, cudaArray_const_t array, const struct cudaChannelFormatDesc * desc)
Binds the CUDA array array to the texture reference texref. desc describes how the memory is interpreted when fetching values from the texture. Any CUDA array previously bound to texref is unbound.
Parameters:
-
texref - Texture to bind
array - Memory array on device
desc - Channel format
Returns:
- cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C++ API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C API)
cudaError_t cudaBindTextureToMipmappedArray (const struct textureReference * texref, cudaMipmappedArray_const_t mipmappedArray, const struct cudaChannelFormatDesc * desc)
Binds the CUDA mipmapped array mipmappedArray to the texture reference texref. desc describes how the memory is interpreted when fetching values from the texture. Any CUDA mipmapped array previously bound to texref is unbound.
Parameters:
-
texref - Texture to bind
mipmappedArray - Memory mipmapped array on device
desc - Channel format
Returns:
- cudaSuccess, cudaErrorInvalidValue, cudaErrorInvalidDevicePointer, cudaErrorInvalidTexture
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C++ API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C API)
struct cudaChannelFormatDesc cudaCreateChannelDesc (int x, int y, int z, int w, enum cudaChannelFormatKind f) [read]
Returns a channel descriptor with format f and number of bits of each component x, y, z, and w. The cudaChannelFormatDesc is defined as:
struct cudaChannelFormatDesc {
int x, y, z, w;
enum cudaChannelFormatKind f;
};
where cudaChannelFormatKind is one of cudaChannelFormatKindSigned, cudaChannelFormatKindUnsigned, or cudaChannelFormatKindFloat.
Parameters:
-
x - X component
y - Y component
z - Z component
w - W component
f - Channel format
Returns:
- Channel descriptor with format f
See also:
- cudaCreateChannelDesc (C++ API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C API)
cudaError_t cudaGetChannelDesc (struct cudaChannelFormatDesc * desc, cudaArray_const_t array)
Returns in *desc the channel descriptor of the CUDA array array.
Parameters:
-
desc - Channel format
array - Memory array on device
Returns:
- cudaSuccess, cudaErrorInvalidValue
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C API)
cudaError_t cudaGetTextureAlignmentOffset (size_t * offset, const struct textureReference * texref)
Returns in *offset the offset that was returned when texture reference texref was bound.
Parameters:
-
offset - Offset of texture reference in bytes
texref - Texture to get offset of
Returns:
- cudaSuccess, cudaErrorInvalidTexture, cudaErrorInvalidTextureBinding
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C API), cudaGetTextureAlignmentOffset (C++ API)
cudaError_t cudaGetTextureReference (const struct textureReference ** texref, const void * symbol)
Returns in *texref the structure associated to the texture reference defined by symbol symbol.
Parameters:
-
texref - Texture reference associated with symbol
symbol - Texture to get reference for
Returns:
- cudaSuccess, cudaErrorInvalidTexture
Note:
-
Note that this function may also return error codes from previous, asynchronous launches.
Use of a string naming a variable as the symbol parameter was removed in CUDA 5.0.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureAlignmentOffset (C API), cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C API)
cudaError_t cudaUnbindTexture (const struct textureReference * texref)
Unbinds the texture bound to texref.
Parameters:
- texref - Texture to unbind
Returns:
- cudaSuccess
Note:
- Note that this function may also return error codes from previous, asynchronous launches.
See also:
- cudaCreateChannelDesc (C API), cudaGetChannelDesc, cudaGetTextureReference, cudaBindTexture (C API), cudaBindTexture2D (C API), cudaBindTextureToArray (C API), cudaUnbindTexture (C++ API), cudaGetTextureAlignmentOffset (C API)
Author
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