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<h1 id="firstHeading" class="firstHeading">Shader:send</h1>
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<td><i> <b>Available since LÖVE <a href="https://love2d.org/wiki/0.9.0" title="0.9.0">0.9.0</a></b> </i>
</td></tr>
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<td> <small>It has been renamed from <a href="PixelEffect%3asend.html" title="PixelEffect:send">PixelEffect:send</a>.</small>
</td></tr></table>
<p>Sends one or more values to a special (<i>extern</i>) variable inside the shader. Extern variables have to be marked using the <i>extern</i> keyword, e.g.
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="glsl source-glsl"><span class="kw2">extern</span> number time<span class="sy0">;</span><br /><span class="kw2">extern</span> <span class="kw3">vec2</span> light_pos<span class="sy0">;</span><br /><span class="kw2">extern</span> <span class="kw3">vec4</span> colors<span class="br0">[</span><span class="nu0">4</span><span class="br0">]</span><span class="sy0">;</span></div></div>
<p>The corresponding send calls would be
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">shader:send<span class="br0">(</span><span class="st0">"time"</span>, t<span class="br0">)</span><br />shader:send<span class="br0">(</span><span class="st0">"light_pos"</span>, <span class="br0">{</span>light_x, light_y<span class="br0">}</span><span class="br0">)</span><br />shader:send<span class="br0">(</span><span class="st0">"colors"</span>, <span class="br0">{</span>r1, g1, b1, a1<span class="br0">}</span>, <span class="br0">{</span>r2, g2, b2, a2<span class="br0">}</span>, <span class="br0">{</span>r3, g3, b3, a3<span class="br0">}</span>, <span class="br0">{</span>r4, g4, b4, a4<span class="br0">}</span><span class="br0">)</span></div></div>
<p><br />
Extern variables can be accessed in both the Vertex and Pixel components of a shader, as long as the variable is declared in each.
</p>
<h2> <span class="mw-headline" id="Function"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, number, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the number to send to the shader.
</dd><dt><code><a href="number.html" title="number">number</a> number</code></dt><dd> Number to send to store in the extern.
</dd><dt><code><a href="number.html" title="number">number</a> ...</code></dt><dd> Additional numbers to send in case the extern is an array.
</dd></dl>
<h3> <span class="mw-headline" id="Returns"> Returns </span></h3>
<p>Nothing.
</p>
<h3> <span class="mw-headline" id="Notes"> Notes </span></h3>
<p>Because all numbers in Lua are floating point, you must use the function <a href="https://love2d.org/w/index.php?title=Shader:sendInt&action=edit&redlink=1" class="new" title="Shader:sendInt (page does not exist)">Shader:sendInt</a> to send values to <code>extern int</code> variables in the shader's code.
</p>
<h2> <span class="mw-headline" id="Function_2"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis_2"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, vector, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments_2"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the vector to send to the shader.
</dd><dt><code><a href="table.html" title="table">table</a> vector</code></dt><dd> Numbers to send to the extern as a vector. The number of elements in the table determines the type of the vector (e.g. two numbers -> vec2). At least two and at most four numbers can be used.
</dd><dt><code><a href="table.html" title="table">table</a> ...</code></dt><dd> Additional vectors to send in case the extern is an array. All vectors need to be of the same size (e.g. only vec3's)
</dd></dl>
<h3> <span class="mw-headline" id="Returns_2"> Returns </span></h3>
<p>Nothing.
</p>
<h2> <span class="mw-headline" id="Function_3"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis_3"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, matrix, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments_3"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the matrix to send to the shader.
</dd><dt><code><a href="table.html" title="table">table</a> matrix</code></dt><dd> 2x2, 3x3, or 4x4 matrix to send to the extern. Using table form: <code>{{a,b,c,d}, {e,f,g,h}, ... }</code>
</dd><dt><code><a href="table.html" title="table">table</a> ...</code></dt><dd> Additional matrices of the same type as <i>matrix</i> to store in the extern array.
</dd></dl>
<h3> <span class="mw-headline" id="Returns_3"> Returns </span></h3>
<p>Nothing.
</p>
<h2> <span class="mw-headline" id="Function_4"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis_4"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, image, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments_4"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the Image to send to the shader.
</dd><dt><code><a href="Image.html" title="Image">Image</a> image</code></dt><dd> Image to send to the extern.
</dd><dt><code><a href="Image.html" title="Image">Image</a> ...</code></dt><dd> Additional Images in case the extern is an array.
</dd></dl>
<h3> <span class="mw-headline" id="Returns_4"> Returns </span></h3>
<p>Nothing.
</p>
<h2> <span class="mw-headline" id="Function_5"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis_5"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, canvas, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments_5"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the Canvas to send to the shader.
</dd><dt><code><a href="Canvas.html" title="Canvas">Canvas</a> canvas</code></dt><dd> Canvas to send to the extern. The shader extern type is <i>Image</i>.
</dd><dt><code><a href="Canvas.html" title="Canvas">Canvas</a> ...</code></dt><dd> Additional Canvases to send to the extern array.
</dd></dl>
<h3> <span class="mw-headline" id="Returns_5"> Returns </span></h3>
<p>Nothing.
</p>
<h2> <span class="mw-headline" id="Function_6"> Function </span></h2>
<h3> <span class="mw-headline" id="Synopsis_6"> Synopsis </span></h3>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="lua source-lua">Shader:send<span class="br0">(</span> name, boolean, ... <span class="br0">)</span></div></div>
<h3> <span class="mw-headline" id="Arguments_6"> Arguments </span></h3>
<dl><dt><code><a href="string.html" title="string">string</a> name</code></dt><dd> Name of the boolean to send to the shader.
</dd><dt><code><a href="boolean.html" title="boolean">boolean</a> boolean</code></dt><dd> Boolean to send to store in the extern.
</dd><dt><code><a href="boolean.html" title="boolean">boolean</a> ...</code></dt><dd> Additional booleans to send in case the extern is an array.
</dd></dl>
<h3> <span class="mw-headline" id="Returns_6"> Returns </span></h3>
<p>Nothing.
</p>
<h2> <span class="mw-headline" id="See_Also"> See Also </span></h2>
<ul><li> <a href="Shader.html" title="Shader">Shader</a>
</li><li> <a href="https://love2d.org/w/index.php?title=Shader:sendInt&action=edit&redlink=1" class="new" title="Shader:sendInt (page does not exist)">Shader:sendInt</a>
</li></ul>
<h2> <span class="mw-headline" id="Other_Languages"> Other Languages </span></h2>
<div class="i18n">
<p><a href="https://love2d.org/w/index.php?title=Shader:send_(Dansk)&action=edit&redlink=1" class="new" title="Shader:send (Dansk) (page does not exist)">Dansk</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Deutsch)&action=edit&redlink=1" class="new" title="Shader:send (Deutsch) (page does not exist)">Deutsch</a> –
<strong class="selflink">English</strong> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Espa%C3%B1ol)&action=edit&redlink=1" class="new" title="Shader:send (Español) (page does not exist)">Español</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Fran%C3%A7ais)&action=edit&redlink=1" class="new" title="Shader:send (Français) (page does not exist)">Français</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Indonesia)&action=edit&redlink=1" class="new" title="Shader:send (Indonesia) (page does not exist)">Indonesia</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Italiano)&action=edit&redlink=1" class="new" title="Shader:send (Italiano) (page does not exist)">Italiano</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Lietuvi%C5%A1kai)&action=edit&redlink=1" class="new" title="Shader:send (Lietuviškai) (page does not exist)">Lietuviškai</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Magyar)&action=edit&redlink=1" class="new" title="Shader:send (Magyar) (page does not exist)">Magyar</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Nederlands)&action=edit&redlink=1" class="new" title="Shader:send (Nederlands) (page does not exist)">Nederlands</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Polski)&action=edit&redlink=1" class="new" title="Shader:send (Polski) (page does not exist)">Polski</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Portugu%C3%AAs)&action=edit&redlink=1" class="new" title="Shader:send (Português) (page does not exist)">Português</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Rom%C3%A2n%C4%83)&action=edit&redlink=1" class="new" title="Shader:send (Română) (page does not exist)">Română</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Slovensk%C3%BD)&action=edit&redlink=1" class="new" title="Shader:send (Slovenský) (page does not exist)">Slovenský</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Suomi)&action=edit&redlink=1" class="new" title="Shader:send (Suomi) (page does not exist)">Suomi</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Svenska)&action=edit&redlink=1" class="new" title="Shader:send (Svenska) (page does not exist)">Svenska</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(T%C3%BCrk%C3%A7e)&action=edit&redlink=1" class="new" title="Shader:send (Türkçe) (page does not exist)">Türkçe</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%C4%8Cesky)&action=edit&redlink=1" class="new" title="Shader:send (Česky) (page does not exist)">Česky</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%CE%95%CE%BB%CE%BB%CE%B7%CE%BD%CE%B9%CE%BA%CE%AC)&action=edit&redlink=1" class="new" title="Shader:send (Ελληνικά) (page does not exist)">Ελληνικά</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%D0%91%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D1%81%D0%BA%D0%B8)&action=edit&redlink=1" class="new" title="Shader:send (Български) (page does not exist)">Български</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%D0%A0%D1%83%D1%81%D1%81%D0%BA%D0%B8%D0%B9)&action=edit&redlink=1" class="new" title="Shader:send (Русский) (page does not exist)">Русский</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%D0%A1%D1%80%D0%BF%D1%81%D0%BA%D0%B8)&action=edit&redlink=1" class="new" title="Shader:send (Српски) (page does not exist)">Српски</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%D0%A3%D0%BA%D1%80%D0%B0%D1%97%D0%BD%D1%81%D1%8C%D0%BA%D0%B0)&action=edit&redlink=1" class="new" title="Shader:send (Українська) (page does not exist)">Українська</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%D7%A2%D7%91%D7%A8%D7%99%D7%AA)&action=edit&redlink=1" class="new" title="Shader:send (עברית) (page does not exist)">עברית</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%E0%B9%84%E0%B8%97%E0%B8%A2)&action=edit&redlink=1" class="new" title="Shader:send (ไทย) (page does not exist)">ไทย</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%E6%97%A5%E6%9C%AC%E8%AA%9E)&action=edit&redlink=1" class="new" title="Shader:send (日本語) (page does not exist)">日本語</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%E6%AD%A3%E9%AB%94%E4%B8%AD%E6%96%87)&action=edit&redlink=1" class="new" title="Shader:send (正體中文) (page does not exist)">正體中文</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87)&action=edit&redlink=1" class="new" title="Shader:send (简体中文) (page does not exist)">简体中文</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(Ti%E1%BA%BFng_Vi%E1%BB%87t)&action=edit&redlink=1" class="new" title="Shader:send (Tiếng Việt) (page does not exist)">Tiếng Việt</a> –
<a href="https://love2d.org/w/index.php?title=Shader:send_(%ED%95%9C%EA%B5%AD%EC%96%B4)&action=edit&redlink=1" class="new" title="Shader:send (한국어) (page does not exist)">한국어</a>
<br />
<span style="text-align:right;"><i><a href="https://love2d.org/wiki/Help:i18n" title="Help:i18n">More info</a></i></span>
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<h5>Personal tools</h5>
<div class="pBody">
<ul>
<li id="pt-login"><a href="https://love2d.org/w/index.php?title=Special:UserLogin&returnto=Shader:send" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o">Log in</a></li>
</ul>
</div>
</div>
<div class="portlet" id="p-logo">
<a style="background-image: url(wiki.png);" href="https://love2d.org/wiki/Main_Page" title="Visit the main page"></a>
</div>
<!-- <div class="portlet" id="p-docs">
<h5>Documentation</h5>
<div class="pBody">
<ul>
<li><a href="//love2d.org/wiki/love">love</a></li>
<li><a href="//love2d.org/wiki/love.audio">love.audio</a></li>
<li><a href="//love2d.org/wiki/love.event">love.event</a></li>
<li><a href="//love2d.org/wiki/love.filesystem">love.filesystem</a></li>
<li><a href="//love2d.org/wiki/love.graphics">love.graphics</a></li>
<li><a href="//love2d.org/wiki/love.image">love.image</a></li>
<li><a href="//love2d.org/wiki/love.joystick">love.joystick</a></li>
<li><a href="//love2d.org/wiki/love.keyboard">love.keyboard</a></li>
<li><a href="//love2d.org/wiki/love.math">love.math</a></li>
<li><a href="//love2d.org/wiki/love.mouse">love.mouse</a></li>
<li><a href="//love2d.org/wiki/love.physics">love.physics</a></li>
<li><a href="//love2d.org/wiki/love.sound">love.sound</a></li>
<li><a href="//love2d.org/wiki/love.system">love.system</a></li>
<li><a href="//love2d.org/wiki/love.timer">love.timer</a></li>
<li><a href="//love2d.org/wiki/love.window">love.window</a></li>
</ul>
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<div class='generated-sidebar portlet' id='p-documentation'>
<h5>documentation</h5>
<div class='pBody'>
<ul>
<li id="n-love"><a href="love.html">love</a></li>
<li id="n-love.audio"><a href="love.audio.html">love.audio</a></li>
<li id="n-love.event"><a href="love.event.html">love.event</a></li>
<li id="n-love.filesystem"><a href="love.filesystem.html">love.filesystem</a></li>
<li id="n-love.font"><a href="love.font.html">love.font</a></li>
<li id="n-love.graphics"><a href="love.graphics.html">love.graphics</a></li>
<li id="n-love.image"><a href="love.image.html">love.image</a></li>
<li id="n-love.joystick"><a href="love.joystick.html">love.joystick</a></li>
<li id="n-love.keyboard"><a href="love.keyboard.html">love.keyboard</a></li>
<li id="n-love.math"><a href="love.math.html">love.math</a></li>
<li id="n-love.mouse"><a href="love.mouse.html">love.mouse</a></li>
<li id="n-love.physics"><a href="love.physics.html">love.physics</a></li>
<li id="n-love.sound"><a href="love.sound.html">love.sound</a></li>
<li id="n-love.system"><a href="love.system.html">love.system</a></li>
<li id="n-love.thread"><a href="love.thread.html">love.thread</a></li>
<li id="n-love.timer"><a href="love.timer.html">love.timer</a></li>
<li id="n-love.window"><a href="love.window.html">love.window</a></li>
</ul>
</div>
</div>
<div class='generated-sidebar portlet' id='p-navigation'>
<h5>Navigation</h5>
<div class='pBody'>
<ul>
<li id="n-Home"><a href="http://love2d.org/">Home</a></li>
<li id="n-Forums"><a href="http://love2d.org/forums">Forums</a></li>
<li id="n-Issue-tracker"><a href="http://bitbucket.org/rude/love/issues">Issue tracker</a></li>
</ul>
</div>
</div>
<div class='generated-sidebar portlet' id='p-wiki_navigation'>
<h5>wiki navigation</h5>
<div class='pBody'>
<ul>
<li id="n-mainpage-description"><a href="https://love2d.org/wiki/Main_Page" title="Visit the main page [z]" accesskey="z">Main page</a></li>
<li id="n-recentchanges"><a href="https://love2d.org/wiki/Special:RecentChanges" title="The list of recent changes in the wiki [r]" accesskey="r">Recent changes</a></li>
<li id="n-randompage"><a href="https://love2d.org/wiki/Special:Random" title="Load a random page [x]" accesskey="x">Random page</a></li>
</ul>
</div>
</div>
<div id="p-search" class="portlet">
<h5><label for="searchInput">Search</label></h5>
<div id="searchBody" class="pBody">
<form action="https://love2d.org/w/index.php" id="searchform"><div>
<input type='hidden' name="title" value="Special:Search"/>
<input id="searchInput" name="search" type="text" title="Search LOVE [f]" accesskey="f" value="" />
<input type='submit' name="go" class="searchButton" id="searchGoButton" value="Go" title="Go to a page with this exact name if exists" />
<input type='submit' name="fulltext" class="searchButton" id="mw-searchButton" value="Search" title="Search the pages for this text" />
</div></form>
</div>
</div>
<div class="portlet" id="p-tb">
<h5>Toolbox</h5>
<div class="pBody">
<ul>
<li id="t-whatlinkshere"><a href="https://love2d.org/wiki/Special:WhatLinksHere/Shader:send" title="List of all wiki pages that link here [j]" accesskey="j">What links here</a></li>
<li id="t-recentchangeslinked"><a href="https://love2d.org/wiki/Special:RecentChangesLinked/Shader:send" title="Recent changes in pages linked from this page [k]" accesskey="k">Related changes</a></li>
<li id="t-specialpages"><a href="https://love2d.org/wiki/Special:SpecialPages" title="List of all special pages [q]" accesskey="q">Special pages</a></li>
<li id="t-print"><a href="https://love2d.org/w/index.php?title=Shader:send&printable=yes" rel="alternate" title="Printable version of this page [p]" accesskey="p">Printable version</a></li> <li id="t-permalink"><a href="https://love2d.org/w/index.php?title=Shader:send&oldid=11810" title="Permanent link to this revision of the page">Permanent link</a></li><li id="t-smwbrowselink"><a href="https://love2d.org/wiki/Special:Browse/Shader:send" title="Special:Browse/Shader:send">Browse properties</a></li> </ul>
</div>
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<ul id="f-list">
<li id="lastmod"> This page was last modified on 10 October 2013, at 07:54.</li>
<li id="copyright">Content is available under <a href="http://www.gnu.org/copyleft/fdl.html" class="external ">GNU Free Documentation License 1.3</a>.</li>
<li id="privacy"><a href="https://love2d.org/wiki/LOVE:Privacy_policy" title="LOVE:Privacy policy">Privacy policy</a></li>
<li id="about"><a href="https://love2d.org/wiki/LOVE:About" title="LOVE:About">About LOVE</a></li>
<li id="disclaimer"><a href="https://love2d.org/wiki/LOVE:General_disclaimer" title="LOVE:General disclaimer">Disclaimers</a></li>
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