Extends CL/GL sharing to allow a CL image to be created from a GL depth or depth-stencil texture.

#pragma OPENCL EXTENSION cl_khr_gl_depth_images : enable


The cl_khr_gl_depth_images extension extends CL / GL sharing (i.e. the cl_khr_gl_sharing extension) defined in section 9.7 to allow a CL depth image to be created from a GL depth or depth-stencil texture. If this extension is supported by an implementation, the string cl_khr_gl_depth_images will be present in the CL_PLATFORM_EXTENSIONS string described in table 4.1 or CL_DEVICE_EXTENSIONS string described in table 4.3.

Depth images with an image channel order of CL_DEPTH_STENCIL can only be created using the clCreateFromGLTexture API.

For the image format given by channel order of CL_DEPTH_STENCIL and channel data type of CL_UNORM_INT24, the depth is stored as an unsigned normalized 24-bit value.

For the image format given by channel order of CL DEPTH_STENCIL and channel data type of CL_FLOAT, each pixel is two 32-bit values. The depth is stored as a single precision floating point value followed by the stencil which is stored as a 8-bit integer value.

The stencil value cannot be read or written using the read imagef and write imagef built-in functions in an OpenCL kernel.

Depth image objects with an image channel order = CL_DEPTH_STENCIL cannot be used as arguments to clEnqueueReadImage, clEnqueueWriteImage, clEnqueueCopyImage, clEnqueueCopyImageToBuffer, clEnqueueCopyBufferToImage, clEnqueueMapImage and clEnqueueFillImage and will return a CL_INVALID_OPERATION error.

The following new image formats are added to table 9.4 in section of the OpenCL 2.1 extension specification. If a GL texture object with an internal format from table 9.4 is successfully created by OpenGL, then there is guaranteed to be a mapping to one of the corresponding CL image format(s) in that table.

GL internal format CL image format (channel order, channel data type)


OpenCL Specification

Copyright © 2007-2015 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.