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NAME
Image_Read_and_Write_Functions - Built-in functions to read, write, and query image memory
objects. Click an item in the table below for details about that function.
┌──────────────────────────────────┬──────────────────────────────────┐
│read_imagef1d(3clc) for 1D │ Do an element lookup in the 1D │
│ │ image object with or without a │
│ │ sampler, returning │
│ │ floating-point values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imagei1d(3clc) for 1D │ Do an element lookup in the 1D │
│ │ image object with or without a │
│ │ sampler, returning unnormalized │
│ │ signed integer and unsigned │
│ │ integer values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imageh1d(3clc) for 1D │ OPTIONAL function to do an │
│ │ element lookup in the 1D image │
│ │ object with or without a │
│ │ sampler, returning │
│ │ floating-point values. Enabled │
│ │ with cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│write_image1d(3clc) for 1D │ Write color value to location in │
│ │ the 2D image object. The half │
│ │ type is enabled with │
│ │ cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imagef2d(3clc) for 2D │ Do an element lookup in the 2D │
│ │ image object with or without a │
│ │ sampler, returning │
│ │ floating-point values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imagei2d(3clc) for 2D │ Do an element lookup in the 2D │
│ │ image object with or without a │
│ │ sampler, returning unnormalized │
│ │ signed integer and unsigned │
│ │ integer values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imageh2d(3clc) for 2D │ OPTIONAL function to do an │
│ │ element lookup in the 2D image │
│ │ object with or without a │
│ │ sampler, returning │
│ │ floating-point values. Enabled │
│ │ with cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│write_image2d(3clc) for 2D │ Write color value to location in │
│ │ the 2D image object. The half │
│ │ type is enabled with │
│ │ cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imagef3d(3clc) for 3D │ Do an element lookup in the 3D │
│ │ image object with or without a │
│ │ sampler, returning │
│ │ floating-point values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imagei3d(3clc) for 3D │ Do an element lookup in the 3D │
│ │ image object with or without a │
│ │ sampler, returning unnormalized │
│ │ signed integer and unsigned │
│ │ integer values. │
├──────────────────────────────────┼──────────────────────────────────┤
│read_imageh3d(3clc) for 3D │ OPTIONAL function to do an │
│ │ element lookup in the 3D image │
│ │ object with or without a │
│ │ sampler, returning │
│ │ floating-point values. Enabled │
│ │ with cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│write_image3d(3clc) for 3D │ Write color value to location in │
│ │ the 2D image object. The half │
│ │ type is enabled with │
│ │ cl_khr_fp16(3clc). │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_width(3clc) │ Return the image width in pixels │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_height(3clc) │ Return the image height in │
│ │ pixels. │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_depth(3clc) │ Return the 3D image depth in │
│ │ pixels │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_channel_data_type(3clc) │ Return the image channel data │
│ │ type │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_channel_order(3clc) │ Return the image channel order │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_dim(3clc) │ Return the image dimensions │
├──────────────────────────────────┼──────────────────────────────────┤
│get_image_array_size(3clc) │ Return the number of images in │
│ │ an image array │
└──────────────────────────────────┴──────────────────────────────────┘
NOTES
The built-in functions defined in this section can only be used with image memory objects.
An image memory object can be accessed by specific function calls that read from and/or
write to specific locations in the image.
Image memory objects that are being read by a kernel should be declared with the
accessQualifiers(3clc) qualifier. write_image calls to image memory objects declared with
the accessQualifiers(3clc) qualifier will generate a compilation error. Image memory
objects that are being written to by a kernel should be declared with the
accessQualifiers(3clc) qualifier. read_image calls to image memory objects declared with
the accessQualifiers(3clc) qualifier will generate a compilation error. read_image and
write_image calls to the same image memory object in a kernel are not supported.
The read_image calls returns a four component floating-point, integer or unsigned integer
color value. The color values returned by read_image are identified as x, y, z, w where x
refers to the red component, y refers to the green component, z refers to the blue
component and w refers to the alpha component.
SPECIFICATION
OpenCL Specification[1]
SEE ALSO
sampler_t(3clc), cl_khr_3d_image_writes(3clc)
AUTHORS
The Khronos Group
COPYRIGHT
Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and/or associated documentation files (the "Materials"), to deal in the Materials
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Materials, and to permit
persons to whom the Materials are furnished to do so, subject to the condition that this
copyright notice and permission notice shall be included in all copies or substantial
portions of the Materials.
NOTES
1. OpenCL Specification
page 292, section 6.12.14 - Image Read and Write Functions