cl_khr_gl_depth_images
Extends CL/GL sharing to allow a CL image to be created from a GL depth or depth-stencil texture.
Description
The cl_khr_gl_depth_images extension extends
CL / GL sharing by allowing a CL depth image to be created from a GL
depth or depth-stencil texture. 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 9.7.3.1 of the OpenCL 2.0 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) |
|---|---|
GL_DEPTH_COMPONENT32F
|
CL_DEPTH, CL_FLOAT
|
GL_DEPTH_COMPONENT16
|
CL_DEPTH, CL_UNORM_INT16
|
GL_DEPTH24_STENCIL8
|
CL_DEPTH_STENCIL, CL_UNORM_INT24
|
GL_DEPTH32F_STENCIL8
|
CL_DEPTH_STENCIL, CL_FLOAT
|
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