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<title>cl_khr_gl_msaa_sharing</title>
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<h1>cl_khr_gl_msaa_sharing</h1>
<p>
Extends the CL/GL sharing to support GL multi-sampled texture (color or depth).
</p>
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<a id="synopsis"></a>
<h3>
</h3>
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#pragma OPENCL EXTENSION cl_khr_gl_msaa_sharing : enable
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<h2></h2>
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<strong class="fsfunc">
read_imagef
</strong>
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read_imagei
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read_imageui
</strong>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_t </a>
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, </td>
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read_imagef
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read_imagei
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read_imagef
</strong>
(</code>
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, </td>
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read_imagef
</strong>
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, </td>
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<strong class="fsfunc">
get_image_width
</strong>
(</code>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
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get_image_width
</strong>
(</code>
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 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
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<strong class="fsfunc">
get_image_width
</strong>
(</code>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
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get_image_width
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
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get_image_height
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get_image_height
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(</code>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_t </a>
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<code>)</code></td>
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<strong class="fsfunc">
get_image_height
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(</code>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
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<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
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<strong class="fsfunc">
get_image_height
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(</code>
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<strong class="fsfunc">
get_image_channel_data_type
</strong>
(</code>
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<strong class="fsfunc">
get_image_channel_data_type
</strong>
(</code>
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<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_t </a>
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_data_type
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_data_type
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_order
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_order
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_order
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_channel_order
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<strong class="fsfunc">
get_image_dim
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<strong class="fsfunc">
get_image_dim
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<strong class="fsfunc">
get_image_dim
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
<strong class="fsfunc">
get_image_dim
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">size_t</a>
<strong class="fsfunc">
get_image_array_size
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_num_samples
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_num_samples
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_num_samples
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">int</a>
<strong class="fsfunc">
get_image_num_samples
</strong>
(</code>
<td>
<a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_msaa_depth_t </a>
 <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
<code>)</code></td>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
This extension name is <code class="function">cl_khr_gl_msaa_sharing</code>. This extension requires
<a class="citerefentry" href="cl_khr_gl_depth_images.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_gl_depth_images</span></span></a>.
</p>
<p>
Multi-sample CL image objects (MSAA) can only be read
from a kernel. Multi-sample CL image objects
cannot be used as arguments to
<a class="citerefentry" href="clEnqueueReadImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueReadImage</span></span></a> ,
<a class="citerefentry" href="clEnqueueWriteImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueWriteImage</span></span></a>,
<a class="citerefentry" href="clEnqueueCopyImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImage</span></span></a>,
<a class="citerefentry" href="clEnqueueCopyImageToBuffer.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyImageToBuffer</span></span></a>,
<a class="citerefentry" href="clEnqueueCopyBufferToImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueCopyBufferToImage</span></span></a>,
<a class="citerefentry" href="clEnqueueMapImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueMapImage</span></span></a> and
<a class="citerefentry" href="clEnqueueFillImage.html"><span class="citerefentry"><span class="refentrytitle">clEnqueueFillImage</span></span></a> and will return a
<span class="errorname">CL_INVALID_OPERATION</span> error.
</p>
<p>
Add the following entry to table 9.5 (see
<a class="citerefentry" href="clGetGLTextureInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetGLTextureInfo</span></span></a>):
</p>
<div class="informaltable">
<table border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
<col />
</colgroup>
<thead>
<tr>
<th align="left">cl_gl_texture_info</th>
<th align="left">Return Type</th>
<th align="left">Info. returned in <code class="varname">param_value</code></th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<code class="constant">CL_GL_NUM_SAMPLES</code>
</td>
<td align="left">
<span class="type">GLsizei</span>
</td>
<td align="left"><p>The samples argument passed to
glTexImage2DMultisample or
glTexImage3DMultisample.</p>
<p>If <code class="varname">image</code> is not a MSAA texture, 1 is
returned.</p></td>
</tr>
</tbody>
</table>
</div>
<p>
Add the following new data types to table 6.3 in section 6.1.3 of the OpenCL 2.0 specification
(see <a class="citerefentry" href="otherDataTypes.html"><span class="citerefentry"><span class="refentrytitle">otherDataTypes</span></span></a>):
</p>
<div class="informaltable">
<table border="1">
<colgroup>
<col align="left" class="col1" />
<col align="left" class="col2" />
</colgroup>
<thead>
<tr>
<th align="left">Type</th>
<th align="left">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">
<span class="type">image2d_msaa_t</span>
</td>
<td align="left">A 2D multi-sample color image. Refer to section
6.13.14 for a detailed description of the built-in
functions that use this type.</td>
</tr>
<tr>
<td align="left">
<span class="type">image2d_array_msaa_t</span>
</td>
<td align="left">A 2D multi-sample color image array. Refer to
section 6.13.14 for a detailed description of the
built-in functions that use this type.</td>
</tr>
<tr>
<td align="left">
<span class="type">image2d_msaa_depth_t</span>
</td>
<td align="left">A 2D multi-sample depth image. Refer to section
6.13.14 for a detailed description of the built-in
functions that use this type.</td>
</tr>
<tr>
<td align="left">
<span class="type">image2d_array_msaa_depth_t</span>
</td>
<td align="left">A 2D multi-sample depth image array. Refer to
section 6.13.14 for a detailed description of the
built-in functions that use this type.</td>
</tr>
</tbody>
</table>
</div>
<p>
NOTE: When a multisample image is accessed in a
kernel, the access takes one vector of
integers describing which pixel to fetch and
an integer corresponding to the sample numbers
describing which sample within the pixel to
fetch. sample identifies the sample position in the
multi-sample image.
</p>
<p>
For best performance, we recommend that
<code class="varname">sample</code> be a literal value so it is known at
compile time and the OpenCL compiler can
perform appropriate optimizations for multisample reads on the device.
</p>
<p>
No standard sampling instructions are allowed on
the multisample image. Accessing a coordinate
outside the image and/or a sample that is outside
the number of samples associated with each
pixel in the image is undefined
</p>
<p>
<code class="function">read_imagef</code> uses the coordinate
(<code class="varname">coord.x, coord.y</code>) and <code class="varname">sample</code> to
do an element lookup in the 2D image or depth image object
specified by <code class="varname">image</code>.
</p>
<p>
<code class="function">read_imagef</code> returns floating-point values in the
range [0.0 ... 1.0] for image objects created with
<code class="varname">image_channel_data_type</code> set to one of the
predefined packed formats or <code class="constant">CL_UNORM_INT8</code>, or
<code class="constant">CL_UNORM_INT16</code>.
</p>
<p>
<code class="function">read_imagef</code> returns floating-point values in the
range [-1.0 ... 1.0] for image objects created with
<code class="varname">image_channel_data_type</code> set to <code class="constant">CL_SNORM_INT8</code>,
or <code class="constant">CL_SNORM_INT16</code>.
</p>
<p>
<code class="function">read_imagef</code> returns floating-point values for image
objects created with <code class="varname">image_channel_data_type</code> set to
<code class="constant">CL_HALF_FLOAT</code> or <code class="constant">CL_FLOAT</code>.
</p>
<p>
Values returned by <code class="function">read_imagef</code> for image objects
with <code class="varname">image_channel_data_type</code> values not specified
in the description above are undefined.
</p>
<p>
<code class="function">read_imagei</code> uses the coordinate
(<code class="varname">coord.x, coord.y</code>) and <code class="varname">sample</code> to
do an element lookup in the 2D image object
specified by <code class="varname">image</code>.
</p>
<p>
<code class="function">read_imagei</code> and <code class="function">read_imageui</code> return
unnormalized signed integer and unsigned integer
values respectively. Each channel will be stored in a
32-bit integer.
</p>
<p><code class="function">read_imagei</code> can only be used with image objects
created with <code class="varname">image_channel_data_type</code> set to one of
the following values:</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="constant">CL_SIGNED_INT8,</code>
</li>
<li class="listitem">
<code class="constant">CL_SIGNED_INT16,</code>
</li>
<li class="listitem">
<code class="constant">CL_SIGNED_INT32</code>
</li>
</ul>
</div>
<p>
If the <code class="varname">image_channel_data_type</code> is not one of the
above values, the values returned by <code class="function">read_imagei</code>
are undefined.
</p>
<p>
<code class="function">read_imageui</code> can only be used with image objects
created with <code class="varname">image_channel_data_type</code> set to one of
the following values:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="constant">CL_UNSIGNED_INT8,</code>
</li>
<li class="listitem">
<code class="constant">CL_UNSIGNED_INT16,</code>
</li>
<li class="listitem">
<code class="constant">CL_UNSIGNED_INT32</code>
</li>
</ul>
</div>
<p>
If the <code class="varname">image_channel_data_type</code> is not one of the
above values, the values returned by <code class="function">read_imageui</code>
are undefined.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.0-extensions.pdf#page=113" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<a class="citerefentry" href="imageFunctions.html">
<span class="citerefentry">
<span class="refentrytitle">Image Read and Write Functions</span>
</span>
</a>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" />Copyright © 2007-2013 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.
</div>
</div>
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