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authorsotech117 <michael_foiani@brown.edu>2024-04-09 03:14:17 -0400
committersotech117 <michael_foiani@brown.edu>2024-04-09 03:14:17 -0400
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+ <title>eglCreatePbufferFromClientBuffer</title>
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+ </head>
+ <body>
+ <div class="refentry">
+ <a id="eglCreatePbufferFromClientBuffer"></a>
+ <div class="titlepage"></div>
+ <div xmlns="" class="refnamediv">
+ <h1>eglCreatePbufferFromClientBuffer</h1>
+ <p>
+ create a new <acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">EGL</acronym> pixel buffer surface
+ bound to an OpenVG image
+ </p>
+ </div>
+ <div class="refsynopsisdiv">
+ <h2>C Specification</h2>
+ <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">EGLSurface <strong class="fsfunc">eglCreatePbufferFromClientBuffer</strong>(</code>
+ <td>EGLDisplay  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">display</var>, </td>
+ </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLenum  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buftype</var>, </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLClientBuffer  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">buffer</var>, </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLConfig  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">config</var>, </td>
+ </tr>
+ <tr valign="top">
+ <td> </td>
+ <td>EGLint const *  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">attrib_list</var><code>)</code></td>
+ </tr>
+ </table>
+ </div>
+ </div>
+ <div class="refsect1">
+ <a id="parameters"></a>
+ <h2>Parameters</h2>
+ <div class="variablelist">
+ <dl class="variablelist">
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>display</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>Specifies the EGL display connection.</p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>buftype</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the type of client API buffer to be bound.
+ Must be <code class="constant">EGL_OPENVG_IMAGE</code>,
+ corresponding to an OpenVG <span class="type">VGImage</span>
+ buffer.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>buffer</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the OpenVG <span class="type">VGImage</span> handle of
+ the buffer to be bound.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>config</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the EGL frame buffer configuration that defines the
+ frame buffer resource available to the surface.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <em class="parameter">
+ <code>attrib_list</code>
+ </em>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies pixel buffer surface attributes.
+ May be <code class="constant">NULL</code> or empty
+ (first attribute is <code class="constant">EGL_NONE</code>).
+ </p>
+ </dd>
+ </dl>
+ </div>
+ </div>
+ <div class="refsect1">
+ <a id="description"></a>
+ <h2>Description</h2>
+ <p>
+ <code class="function">eglCreatePbufferFromClientBuffer</code> creates an
+ off-screen pixel buffer surface and returns its handle. If
+ <code class="function">eglCreatePbufferFromClientBuffer</code> fails to create
+ a pixel buffer surface, <code class="constant">EGL_NO_SURFACE</code>
+ is returned.
+ </p>
+ <p>
+ The new pixel buffer surface is similar to a pixel buffer
+ created with
+ <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>,
+ but storage for the color buffer is provided by a client API
+ buffer. Other buffer required by
+ <em class="parameter"><code>config</code></em>, such as depth, stencil, and
+ alpha mask, are allocated by EGL.
+ </p>
+ <p>
+ <em class="parameter"><code>buftype</code></em> must be
+ <code class="constant">EGL_OPENVG_IMAGE</code>, corresponding to an
+ OpenVG <span class="type">VGImage</span> buffer.
+ <em class="parameter"><code>buffer</code></em> must be a valid
+ <span class="type">VGImage</span> handle in the current OpenVG context,
+ cast into the type <span class="type">EGLClientBuffer</span>.
+ </p>
+ <p>
+ The height, width,, OpenVG alpha format, and OpenVG
+ colorspace (surface attributes
+ <code class="constant">EGL_HEIGHT</code>,
+ <code class="constant">EGL_WIDTH</code>,
+ <code class="constant">EGL_VG_ALPHA_FORMAT</code>, and
+ <code class="constant">EGL_VG_COLORSPACE</code>, respectively) of the
+ resulting surface are determined by the size and format of
+ <em class="parameter"><code>buffer</code></em>.
+ </p>
+ <p>
+ Surface attributes are specified as a list of
+ attribute-value pairs, terminated with
+ <code class="constant">EGL_NONE</code>. Accepted attributes are:
+ </p>
+ <div class="variablelist">
+ <dl class="variablelist">
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_MIPMAP_TEXTURE</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies whether storage for mipmaps should be
+ allocated. Space for mipmaps will be set aside if
+ the attribute value is <code class="constant">EGL_TRUE</code>
+ and <code class="constant">EGL_TEXTURE_FORMAT</code> is not
+ <code class="constant">EGL_NO_TEXTURE</code>. The default
+ value is <code class="constant">EGL_FALSE</code>.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_TEXTURE_FORMAT</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the format of the texture that will be
+ created when a pbuffer is bound to a texture map.
+ Possible values are
+ <code class="constant">EGL_NO_TEXTURE</code>,
+ <code class="constant">EGL_TEXTURE_RGB</code>, and
+ <code class="constant">EGL_TEXTURE_RGBA</code>. The default
+ value is <code class="constant">EGL_NO_TEXTURE</code>.
+ </p>
+ </dd>
+ <dt>
+ <span class="term">
+ <code class="constant">EGL_TEXTURE_TARGET</code>
+ </span>
+ </dt>
+ <dd>
+ <p>
+ Specifies the target for the texture that will be
+ created when the pbuffer is created with a texture
+ format of <code class="constant">EGL_TEXTURE_RGB</code> or
+ <code class="constant">EGL_TEXTURE_RGBA</code>. Possible
+ values are <code class="constant">EGL_NO_TEXTURE</code>, or
+ <code class="constant">EGL_TEXTURE_2D</code>. The default
+ value is <code class="constant">EGL_NO_TEXTURE</code>.
+ </p>
+ </dd>
+ </dl>
+ </div>
+ <p>
+ Any EGL rendering context that was created with respect to
+ <em class="parameter"><code>config</code></em> can be used to render into the
+ surface. Use
+ <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>
+ to attach an EGL rendering context to the surface.
+ </p>
+ <p>
+ Use
+ <a class="citerefentry" href="eglQuerySurface.html"><span class="citerefentry"><span class="refentrytitle">eglQuerySurface</span></span></a>
+ to retrieve the dimensions of the allocated pixel buffer
+ surface or the ID of <em class="parameter"><code>config</code></em>.
+ </p>
+ <p>
+ Use <a class="citerefentry" href="eglDestroySurface.html"><span class="citerefentry"><span class="refentrytitle">eglDestroySurface</span></span></a>
+ to destroy the surface.
+ </p>
+ </div>
+ <div class="refsect1">
+ <a id="notes"></a>
+ <h2>Notes</h2>
+ <p>
+ <code class="function">eglCreatePbufferFromClientBuffer</code> is
+ supported only if the EGL version is 1.2 or greater, and if
+ the EGL implementation supports the OpenVG client API.
+ </p>
+ <p>
+ Currently
+ <code class="function">eglCreatePbufferFromClientBuffer</code> only
+ supports binding OpenVG <span class="type">VGImage</span> buffers to
+ pixel buffers. While other client API resources could be
+ supported in the future, mechanisms such as OpenGL ES
+ framebuffer objects, and the family of EGL and client API
+ extensions for defining and using <span class="type">EGLImageKHR</span>
+ images, are a more flexible and general framework to satisfy
+ most of the same needs.
+ </p>
+ <p>
+ If the value of <em class="parameter"><code>config</code></em> attribute
+ <code class="constant">EGL_TEXTURE_FORMAT</code> is not
+ <code class="constant">EGL_NO_TEXTURE</code>, then the pbuffer width
+ and height specify the size of the level zero texture image
+ </p>
+ <p>
+ If <code class="constant">EGL_LARGEST_PBUFFER</code> is specified and
+ if the pbuffer will be used as a texture (i.e. the value of
+ <code class="constant">EGL_TEXTURE_TARGET</code> is
+ <code class="constant">EGL_TEXTURE_2D</code>, and the value of
+ <code class="constant">EGL_TEXTURE FORMAT</code> is
+ <code class="constant">EGL_TEXTURE_RGB</code> or
+ <code class="constant">EGL_TEXTURE_RGBA</code>), then the aspect
+ ratio will be preserved and the new width and height will be
+ valid sizes for the texture target (e.g. if the underlying
+ OpenGL ES implementation does not support non-power-of-two
+ textures, both the width and height will be a power of 2).
+ </p>
+ <p>
+ The contents of the depth and stencil buffers may not be
+ preserved when rendering a texture to the pbuffer and
+ switching which image of the texture is rendered to (e.g.,
+ switching from rendering one mipmap level to rendering
+ another).
+ </p>
+ <p>
+ Binding client API buffers to EGL pbuffers create the
+ possibility of race conditions, and of buffers being deleted
+ through one API while still in use in another API. To avoid
+ these problems, a number of constraints apply to bound
+ client API buffers:
+ </p>
+ <div class="orderedlist">
+ <ol class="orderedlist" type="1">
+ <li class="listitem">
+ <p>
+ Bound buffers may be used exclusively by either EGL,
+ or the client API that originally created them. For
+ example, if a <span class="type">VGImage</span> is bound to a
+ pbuffer, and that pbuffer is bound to any client API
+ rendering context, then the <span class="type">VGImage</span> may
+ not be used as the explicit source or destination of
+ any OpenVG operation. Errors resulting from such use
+ are described in client API specifications.
+ Similarly, while a <span class="type">VGImage</span> is in use by
+ OpenVG, the pbuffer it is bound to may not be made
+ current to any client API context using
+ <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>.
+ </p>
+ </li>
+ <li class="listitem">
+ <p>
+ Binding a buffer creates an additional reference to
+ it, and implementations must respect outstanding
+ references when destroying objects. For example, if
+ a <span class="type">VGImage</span> is bound to a pbuffer,
+ destroying the image with
+ <code class="function">vgDestroyImage</code> will not free
+ the underlying buffer, because it is still in use by
+ EGL. However, following
+ <code class="function">vgDestroyImage</code> the buffer may
+ only be referred to via the EGL pbuffer handle,
+ since the OpenVG handle to that buffer no longer
+ exists. Similarly, destroying the pbuffer with
+ <code class="function">eglDestroySurface</code> will not free
+ the underlying buffer, because it is still in use by
+ OpenVG . However, following
+ <code class="function">eglDestroySurface</code> the buffer
+ may only be referred to via the OpenVG
+ <span class="type">VGImage</span> handle, since the EGL pbuffer
+ handle no longer exists.
+ </p>
+ </li>
+ </ol>
+ </div>
+ <p>
+ </p>
+ </div>
+ <div class="refsect1">
+ <a id="errors"></a>
+ <h2>Errors</h2>
+ <p>
+ <code class="constant">EGL_NO_SURFACE</code> is returned if creation of
+ the context fails.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_DISPLAY</code> is generated if
+ <em class="parameter"><code>display</code></em> is not an EGL display connection.
+ </p>
+ <p>
+ <code class="constant">EGL_NOT_INITIALIZED</code> is generated if
+ <em class="parameter"><code>display</code></em> has not been initialized.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_CONFIG</code> is generated if
+ <em class="parameter"><code>config</code></em> is not an EGL frame buffer configuration.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_PARAMETER</code> is generated if
+ <em class="parameter"><code>buftype</code></em> is not
+ <code class="constant">EGL_OPENVG_IMAGE</code>, or if
+ <em class="parameter"><code>buffer</code></em> is not a valid handle to a
+ <span class="type">VGImage</span> object in the currently bound OpenVG
+ context.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ACCESS</code> is generated if there is
+ no current OpenVG context, or if
+ <em class="parameter"><code>buffer</code></em> is already bound to another
+ pixel buffer or in use by OpenVG as discussed in the Notes
+ section above.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ALLOC</code> is generated if there are not
+ enough resources to allocate the new surface.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
+ <em class="parameter"><code>attrib_list</code></em> contains an invalid pixel
+ buffer attribute or if an attribute value is not recognized
+ or out of range.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_ATTRIBUTE</code> is generated if
+ <em class="parameter"><code>attrib_list</code></em> contains any of the
+ attributes <code class="constant">EGL_MIPMAP_TEXTURE</code>,
+ <code class="constant">EGL_TEXTURE_FORMAT</code>, or
+ <code class="constant">EGL_TEXTURE_TARGET</code>, and
+ <em class="parameter"><code>config</code></em> does not support OpenGL ES
+ rendering (e.g. the EGL version is 1.2 or later, and the
+ <code class="constant">EGL_RENDERABLE_TYPE</code> attribute of
+ <em class="parameter"><code>config</code></em> does not include at least one
+ of <code class="constant">EGL_OPENGL_ES_BIT</code> or
+ <code class="constant">EGL_OPENGL_ES2_BIT</code>).
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_MATCH</code> is generated if
+ <em class="parameter"><code>config</code></em> does not support rendering to pixel buffers
+ (the <code class="constant">EGL_SURFACE_TYPE</code> attribute does not contain
+ <code class="constant">EGL_PBUFFER_BIT</code>).
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_MATCH</code> is generated if the
+ buffers contained in <em class="parameter"><code>buffer</code></em> do not
+ match the bit depths for those buffers specified by
+ <em class="parameter"><code>config</code></em>.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_MATCH</code> is generated if the
+ <code class="constant">EGL_TEXTURE_FORMAT</code> attribute is not
+ <code class="constant">EGL_NO_TEXTURE</code>, and
+ <code class="constant">EGL_WIDTH</code> and/or
+ <code class="constant">EGL_HEIGHT</code> specify an invalid size
+ (e.g., the texture size is not a power of 2, and the
+ underlying OpenGL ES implementation does not support
+ non-power-of-two textures).
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_MATCH</code> is generated if
+ the <code class="constant">EGL_TEXTURE_FORMAT</code> attribute is
+ <code class="constant">EGL_NO_TEXTURE</code>, and
+ <code class="constant">EGL_TEXTURE_TARGET</code> is something other
+ than <code class="constant">EGL_NO_TEXTURE</code>; or,
+ <code class="constant">EGL_TEXTURE_FORMAT</code> is something other
+ than <code class="constant">EGL_NO_TEXTURE</code>, and
+ <code class="constant">EGL_TEXTURE_TARGET</code> is
+ <code class="constant">EGL_NO_TEXTURE</code>.
+ </p>
+ <p>
+ <code class="constant">EGL_BAD_MATCH</code> is generated if the
+ implementation has additional constraints on which types of
+ client API buffers may be bound to pixel buffer surfaces.
+ For example, it is possible that the OpenVG implementation
+ might not support a <span class="type">VGImage</span> being bound to a
+ pixel buffer which will be used as a mipmapped OpenGL ES
+ texture (e.g. whose <code class="constant">EGL_MIPMAP_TEXTURE</code>
+ attribute is <code class="constant">TRUE</code>). Any such
+ constraints should be documented by the implementation
+ release notes.
+ </p>
+ </div>
+ <div class="refsect1">
+ <a id="seealso"></a>
+ <h2>See Also</h2>
+ <p>
+ <a class="citerefentry" href="eglDestroySurface.html"><span class="citerefentry"><span class="refentrytitle">eglDestroySurface</span></span></a>,
+ <a class="citerefentry" href="eglChooseConfig.html"><span class="citerefentry"><span class="refentrytitle">eglChooseConfig</span></span></a>,
+ <a class="citerefentry" href="eglCreatePbufferSurface.html"><span class="citerefentry"><span class="refentrytitle">eglCreatePbufferSurface</span></span></a>,
+ <a class="citerefentry" href="eglGetConfigs.html"><span class="citerefentry"><span class="refentrytitle">eglGetConfigs</span></span></a>,
+ <a class="citerefentry" href="eglMakeCurrent.html"><span class="citerefentry"><span class="refentrytitle">eglMakeCurrent</span></span></a>,
+ <a class="citerefentry" href="eglQuerySurface.html"><span class="citerefentry"><span class="refentrytitle">eglQuerySurface</span></span></a>
+ </p>
+ </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" /><p xmlns="http://www.w3.org/1999/xhtml"></p>
+Copyright © 2003-2014 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>
+ </body>
+</html>
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