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<!-- doxytag: class="irr::video::IShaderConstantSetCallBack" --><!-- doxytag: inherits="irr::IReferenceCounted" -->
<p>Interface making it possible to set constants for gpu programs every frame.
<a href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#details">More...</a></p>
<p><code>#include <<a class="el" href="_i_shader_constant_set_call_back_8h_source.html">IShaderConstantSetCallBack.h</a>></code></p>
<div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for irr::video::IShaderConstantSetCallBack:</div>
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<p><a href="classirr_1_1video_1_1_i_shader_constant_set_call_back-members.html">List of all members.</a></p>
<h2><a name="pub-methods"></a>
Public Member Functions</h2>
<ul>
<li>virtual void <a class="el" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#a91cf4eb8d20d278defaca4e3c9390396">OnSetConstants</a> (<a class="el" href="classirr_1_1video_1_1_i_material_renderer_services.html">IMaterialRendererServices</a> *services, <a class="el" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6">s32</a> userData)=0
<dl class="el"><dd class="mdescRight">Called by the engine when the vertex and/or pixel shader constants for an material renderer should be set. <a href="#a91cf4eb8d20d278defaca4e3c9390396"></a><br/></dl><li>virtual void <a class="el" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#a837ad9419ca4c17b011af75bb24e7a72">OnSetMaterial</a> (const <a class="el" href="classirr_1_1video_1_1_s_material.html">SMaterial</a> &material)
<dl class="el"><dd class="mdescRight">Called to let the callBack know the used material (optional method) <a href="#a837ad9419ca4c17b011af75bb24e7a72"></a><br/></dl></ul>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Interface making it possible to set constants for gpu programs every frame. </p>
<p>Implement this interface in an own class and pass a pointer to it to one of the methods in <a class="el" href="classirr_1_1video_1_1_i_g_p_u_programming_services.html" title="Interface making it possible to create and use programs running on the GPU.">IGPUProgrammingServices</a> when creating a shader. The OnSetConstants method will be called every frame now. </p>
<p>Definition at line <a class="el" href="_i_shader_constant_set_call_back_8h_source.html#l00021">21</a> of file <a class="el" href="_i_shader_constant_set_call_back_8h_source.html">IShaderConstantSetCallBack.h</a>.</p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a91cf4eb8d20d278defaca4e3c9390396"></a><!-- doxytag: member="irr::video::IShaderConstantSetCallBack::OnSetConstants" ref="a91cf4eb8d20d278defaca4e3c9390396" args="(IMaterialRendererServices *services, s32 userData)=0" -->
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<td class="memname">virtual void irr::video::IShaderConstantSetCallBack::OnSetConstants </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classirr_1_1video_1_1_i_material_renderer_services.html">IMaterialRendererServices</a> * </td>
<td class="paramname"><em>services</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6">s32</a> </td>
<td class="paramname"><em>userData</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [pure virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Called by the engine when the vertex and/or pixel shader constants for an material renderer should be set. </p>
<p>Implement the <a class="el" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html" title="Interface making it possible to set constants for gpu programs every frame.">IShaderConstantSetCallBack</a> in an own class and implement your own OnSetConstants method using the given <a class="el" href="classirr_1_1video_1_1_i_material_renderer_services.html" title="Interface providing some methods for changing advanced, internal states of a IVideoDriver.">IMaterialRendererServices</a> interface. Pass a pointer to this class to one of the methods in <a class="el" href="classirr_1_1video_1_1_i_g_p_u_programming_services.html" title="Interface making it possible to create and use programs running on the GPU.">IGPUProgrammingServices</a> when creating a shader. The OnSetConstants method will now be called every time before geometry is being drawn using your shader material. A sample implementation would look like this: </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#a91cf4eb8d20d278defaca4e3c9390396" title="Called by the engine when the vertex and/or pixel shader constants for an material renderer should be...">OnSetConstants</a>(video::IMaterialRendererServices* services, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> userData)
{
video::IVideoDriver* driver = services->getVideoDriver();
<span class="comment">// set clip matrix at register 4</span>
<a class="code" href="namespaceirr_1_1core.html#a73fa92e638c5ca97efd72da307cc9b65" title="Typedef for f32 matrix.">core::matrix4</a> worldViewProj(driver->getTransform(<a class="code" href="namespaceirr_1_1video.html#a15b57657a320243be03ae6f66fcff43dae7ec186418508c67a7562af012d7b63f" title="Projection transformation.">video::ETS_PROJECTION</a>));
worldViewProj *= driver->getTransform(<a class="code" href="namespaceirr_1_1video.html#a15b57657a320243be03ae6f66fcff43da152f4262d5874186e0288934c7d31e14" title="View transformation.">video::ETS_VIEW</a>);
worldViewProj *= driver->getTransform(<a class="code" href="namespaceirr_1_1video.html#a15b57657a320243be03ae6f66fcff43da843cf42adb3fa9caf61c9e228cf14e85" title="World transformation.">video::ETS_WORLD</a>);
services->setVertexShaderConstant(&worldViewProj.M[0], 4, 4);
<span class="comment">// for high level shading languages, this would be another solution:</span>
<span class="comment">//services->setVertexShaderConstant("mWorldViewProj", worldViewProj.M, 16);</span>
<span class="comment">// set some light color at register 9</span>
video::SColorf col(0.0f,1.0f,1.0f,0.0f);
services->setVertexShaderConstant(reinterpret_cast<const f32*>(&col), 9, 1);
<span class="comment">// for high level shading languages, this would be another solution:</span>
<span class="comment">//services->setVertexShaderConstant("myColor", reinterpret_cast<f32*>(&col), 4);</span>
}
</pre></div> <dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">services,:</td><td>Pointer to an interface providing methods to set the constants for the shader. </td></tr>
<tr><td class="paramname">userData,:</td><td>Userdata int which can be specified when creating the shader. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a837ad9419ca4c17b011af75bb24e7a72"></a><!-- doxytag: member="irr::video::IShaderConstantSetCallBack::OnSetMaterial" ref="a837ad9419ca4c17b011af75bb24e7a72" args="(const SMaterial &material)" -->
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<div class="memproto">
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<td class="memname">virtual void irr::video::IShaderConstantSetCallBack::OnSetMaterial </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classirr_1_1video_1_1_s_material.html">SMaterial</a> & </td>
<td class="paramname"><em>material</em></td><td>)</td>
<td><code> [inline, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Called to let the callBack know the used material (optional method) </p>
<div class="fragment"><pre class="fragment"> <span class="keyword">class </span>MyCallBack : <span class="keyword">public</span> IShaderConstantSetCallBack
{
<span class="keyword">const</span> video::SMaterial *UsedMaterial;
<a class="code" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#a837ad9419ca4c17b011af75bb24e7a72" title="Called to let the callBack know the used material (optional method)">OnSetMaterial</a>(<span class="keyword">const</span> video::SMaterial& material)
{
UsedMaterial=&material;
}
<a class="code" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html#a91cf4eb8d20d278defaca4e3c9390396" title="Called by the engine when the vertex and/or pixel shader constants for an material renderer should be...">OnSetConstants</a>(IMaterialRendererServices* services, <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> userData)
{
services->setVertexShaderConstant(<span class="stringliteral">"myColor"</span>, reinterpret_cast<f32*>(&UsedMaterial->color), 4);
}
}
</pre></div>
<p>Definition at line <a class="el" href="_i_shader_constant_set_call_back_8h_source.html#l00044">44</a> of file <a class="el" href="_i_shader_constant_set_call_back_8h_source.html">IShaderConstantSetCallBack.h</a>.</p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="_i_shader_constant_set_call_back_8h_source.html">IShaderConstantSetCallBack.h</a></li>
</ul>
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<li class="navelem"><a class="el" href="classirr_1_1video_1_1_i_shader_constant_set_call_back.html">IShaderConstantSetCallBack</a> </li>
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