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cl_image_format - The image format descriptor structure is defined as:
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Copyright
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Description
For example, to specify a normalized unsigned 8-bit / channel RGBA image:
image_channel_order = CL_RGBA
image_channel_data_type = CL_UNORM_INT8image_channel_data_type values of CL_UNORM_SHORT_565, CL_UNORM_SHORT_555 and CL_UNORM_INT_101010 are
special cases of packed image formats where the channels of each element are packed into a single
unsigned short or unsigned int. For these special packed image formats, the channels are normally packed
with the first channel in the most significant bits of the bitfield, and successive channels occupying
progressively less significant locations. For CL_UNORM_SHORT_565, R is in bits 15:11, G is in bits 10:5
and B is in bits 4:0. For CL_UNORM_SHORT_555, bit 15 is undefined, R is in bits 14:10, G in bits 9:5 and
B in bits 4:0. For CL_UNORM_INT_101010, bits 31:30 are undefined, R is in bits 29:20, G in bits 19:10 and
B in bits 9:0.
OpenCL implementations must maintain the minimum precision specified by the number of bits in
image_channel_data_type. If the image format specified by image_channel_order, and
image_channel_data_type cannot be supported by the OpenCL implementation, then the call to
clCreateImage(3clc) will return a NULL memory object.
Members
image_channel_order
Specifies the number of channels and the channel layout i.e. the memory layout in which channels are
stored in the image. Valid values are described in the table below.
┌─────────────────────────┬────────────────────────────────────┐
│ Format │ Description │
├─────────────────────────┼────────────────────────────────────┤
│ CL_R, CL_Rx, or CL_A │ │
├─────────────────────────┼────────────────────────────────────┤
│ CL_INTENSITY │ This format can only be used if │
│ │ channel data type = CL_UNORM_INT8, │
│ │ CL_UNORM_INT16, CL_SNORM_INT8, │
│ │ CL_SNORM_INT16, CL_HALF_FLOAT, or │
│ │ CL_FLOAT. │
├─────────────────────────┼────────────────────────────────────┤
│ CL_LUMINANCE │ This format can only be used if │
│ │ channel data type = CL_UNORM_INT8, │
│ │ CL_UNORM_INT16, CL_SNORM_INT8, │
│ │ CL_SNORM_INT16, CL_HALF_FLOAT, or │
│ │ CL_FLOAT. │
├─────────────────────────┼────────────────────────────────────┤
│ CL_RG, CL_RGx, or CL_RA │ │
├─────────────────────────┼────────────────────────────────────┤
│ CL_RGB or CL_RGBx │ This format can only be used if │
│ │ channel data type = │
│ │ CL_UNORM_SHORT_565, │
│ │ CL_UNORM_SHORT_555 or │
│ │ CL_UNORM_INT101010. │
├─────────────────────────┼────────────────────────────────────┤
│ CL_RGBA │ │
├─────────────────────────┼────────────────────────────────────┤
│ CL_ARGB, CL_BGRA. │ This format can only be used if │
│ │ channel data type = CL_UNORM_INT8, │
│ │ CL_SNORM_INT8, CL_SIGNED_INT8 or │
│ │ CL_UNSIGNED_INT8. │
└─────────────────────────┴────────────────────────────────────┘
image_channel_data_type
Describes the size of the channel data type. The number of bits per element determined by the
image_channel_data_type and image_channel_order must be a power of two. The list of supported values
is described in the table below.
┌─────────────────────────┬──────────────────────────────────────┐
│ ImageChannelDataType │ Description │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_SNORM_INT8 │ Each channel component is a │
│ │ normalized signed 8-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_SNORM_INT16 │ Each channel component is a │
│ │ normalized signed 16-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNORM_INT8 │ Each channel component is a │
│ │ normalized unsigned 8-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNORM_INT16 │ Each channel component is a │
│ │ normalized unsigned 16-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNORM_SHORT_565 │ Represents a normalized 5-6-5 │
│ │ 3-channel RGB image. The channel │
│ │ order must be CL_RGB or CL_RGBx. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNORM_SHORT_555 │ Represents a normalized x-5-5-5 │
│ │ 4-channel xRGB image. The channel │
│ │ order must be CL_RGB or CL_RGBx. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNORM_INT_101010 │ Represents a normalized x-10-10-10 │
│ │ 4-channel xRGB image. The channel │
│ │ order must be CL_RGB or CL_RGBx. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_SIGNED_INT8 │ Each channel component is an │
│ │ unnormalized signed 8-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_SIGNED_INT16 │ Each channel component is an │
│ │ unnormalized signed 16-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_SIGNED_INT32 │ Each channel component is an │
│ │ unnormalized signed 32-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNSIGNED_INT8 │ Each channel component is an │
│ │ unnormalized unsigned 8-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNSIGNED_INT16 │ Each channel component is an │
│ │ unnormalized unsigned 16-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_UNSIGNED_INT32 │ Each channel component is an │
│ │ unnormalized unsigned 32-bit integer │
│ │ value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_HALF_FLOAT │ Each channel component is a 16-bit │
│ │ half-float value. │
├─────────────────────────┼──────────────────────────────────────┤
│ CL_FLOAT │ Each channel component is a single │
│ │ precision floating-point value. │
└─────────────────────────┴──────────────────────────────────────┘
Name
cl_image_format - The image format descriptor structure is defined as:
typedef struct _cl_image_format { cl_channel_order
image_channel_order; cl_channel_type
image_channel_data_type; } cl_image_format;
Notes
1. OpenCL Specification
page 92, section 5.3.1.1 - Image Format Descriptor
The Khronos Group 11/18/2024 CL_IMAGE_FORMAT(3clc)
See Also
imageDescriptor(3clc), EXTENSION(3clc), clGetSupportedImageFormats(3clc), clCreateImage(3clc)
Specification
OpenCLSpecification[1]
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