Description
Return the channel data type. Valid values are:
CLK_SNORM_INT8
CLK_SNORM_INT16
CLK_UNORM_INT8
CLK_UNORM_INT16
CLK_UNORM_SHORT_565
CLK_UNORM_SHORT_555
CLK_UNORM_SHORT_101010
CLK_SIGNED_INT8
CLK_SIGNED_INT16
CLK_SIGNED_INT32
CLK_UNSIGNED_INT8
CLK_UNSIGNED_INT16
CLK_UNSIGNED_INT32
CLK_HALF_FLOAT
CLK_FLOAT
The CLK_ prefixes in the list above correspond to the CL_ prefixes used to describe the image channel order and data type in the tables for cl_image_format. For example, both CL_UNORM_INT8 and CLK_UNORM_INT8 refer to an image channel data type that is an unnormalized unsigned 8-bit integer.
Notes
The values returned by get_image_channel_data_type as
shown above with the CLK_ prefixes correspond to the CL_ prefixes used to describe
the image channel order and data type in the table of supported names and values in
clCreateSubBuffer and
list of supported Image Channel Order Values for clCreateImage3D.
For example, both
CL_UNORM_INT8 and CLK_UNORM_INT8 refer to an image channel data type that is an
unnormalized unsigned 8-bit integer.
The following table describes the mapping of the number of channels of an image element to the appropriate components in the float4, int4 or unsigned int4 vector data type for the color values returned by read_image{f|i|ui} or supplied to write_image{f|i|ui}. The unmapped components will be set to 0.0 for red, green and blue channels and will be set to 1.0 for the alpha channel.
| Channel Order | float4, int4 or unsigned int4 components of channel data |
|---|---|
CL_R, CL_Rx |
(r, 0.0, 0.0, 1.0)
|
CL_A
|
(0.0, 0.0, 0.0, a)
|
CL_RG, CL_RGx |
(r, g, 0.0, 1.0)
|
CL_RA
|
(r, 0.0, 0.0, a)
|
CL_RGB, CL_RGBx |
(r, g, b, 1.0)
|
CL_RGBA, CL_BGRA, CL_ARGB
|
(r, g, b, a)
|
CL_INTENSITY
|
(I, I, I, I)
|
CL_LUMINANCE
|
(L, L, L, 1.0)
|
A kernel that uses a sampler with the CL_ADDRESS_CLAMP addressing mode with multiple images may result in additional samplers being used internally by an implementation. If the same sampler is used with multiple images called via read_image{f | i | ui}, then it is possible that an implementation may need to allocate an additional sampler to handle the different border color values that may be needed depending on the image formats being used. These implementation allocated samplers will count against the maximum sampler values supported by the device and given by CL_DEVICE_MAX_SAMPLERS. Enqueuing a kernel that requires more samplers than the implementation can support will result in a CL_OUT_OF_RESOURCES error being returned.
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