int
get_image_channel_data_type
(
|
image1d_buffer_t
image
) |
int
get_image_channel_data_type
(
|
image1d_array_t
image
) |
int
get_image_channel_data_type
(
|
image2d_array_t
image
) |
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
Notes
The values returned by get_image_channel_order
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
clCreateImage. 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 uint4 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.
Copyright © 2007-2011 The Khronos Group Inc.
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copy of this software and/or associated documentation files (the
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