<div dir="ltr">Hi Jon, <div><br></div><div>Please have a look at the class below. You can create a new instance of it (give it a different name) and you should be able to change its value. </div><div>Looking at the code, the opacity uniform is not an engine uniform (engine uniforms are special uniforms), so you can even get it and then change its value if needed. </div>
<div><br></div><div>- Aashish</div><div><br></div><div><b>In vesShaderProgram.cpp</b></div><div>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">addUniform</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(128,0,128)">vesVertexOpacityUniform</span><span style="color:rgb(0,0,0)">::</span><span style="color:rgb(128,0,128)">Ptr</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(128,128,0)">new</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesVertexOpacityUniform</span><span style="color:rgb(0,0,0)">));</span></pre>
</div><div><br></div><div><b>in vesEngineUniform.h</b></div><div>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(128,128,0)">class</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesVertexOpacityUniform</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">:</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">public</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesUniform</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(0,0,0)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(128,128,0)">public</span><span style="color:rgb(0,0,0)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,128)">vesTypeMacro</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(128,0,128)">vesVertexOpacityUniform</span><span style="color:rgb(0,0,0)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesVertexOpacityUniform</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> </span>std<span style="color:rgb(0,0,0)">::</span>string<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">&</span><span style="color:rgb(0,0,0)">name</span><span style="color:rgb(0,0,0)">=</span><span style="color:rgb(0,128,0)">"vertexOpacity"</span><span style="color:rgb(0,0,0)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesUniform</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">name</span><span style="color:rgb(0,0,0)">,</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">static_cast</span><span style="color:rgb(0,0,0)"><</span><span style="color:rgb(128,128,0)">float</span><span style="color:rgb(0,0,0)">>(</span><span style="color:rgb(0,0,128)">1.0</span><span style="color:rgb(0,0,0)">))</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">virtual</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">void</span><span style="color:rgb(192,192,192)"> </span><span style="font-style:italic;color:rgb(0,0,0)">update</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesRenderState</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">&</span><span style="color:rgb(0,0,0)">renderState</span><span style="color:rgb(0,0,0)">,</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,0,128)">vesShaderProgram</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">&</span><span style="color:rgb(0,0,0)">program</span><span style="color:rgb(0,0,0)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,128)">vesNotUsed</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">program</span><span style="color:rgb(0,0,0)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(128,128,0)">this</span><span style="color:rgb(0,0,0)">-></span><span style="color:rgb(0,0,0)">set</span><span style="color:rgb(0,0,0)">(</span><span style="color:rgb(0,0,0)">renderState</span><span style="color:rgb(0,0,0)">.</span><span style="color:rgb(128,0,0)">m_mapper</span><span style="color:rgb(0,0,0)">-></span>color<span style="color:rgb(0,0,0)">()[</span><span style="color:rgb(0,0,128)">3</span><span style="color:rgb(0,0,0)">]);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(0,0,0)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(0,0,0)">};</span></pre><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(0,0,0)"><br></span></pre><pre style="margin-top:0px;margin-bottom:0px">
<span style="color:rgb(0,0,0)">I have to remember (or find out) why we didn't derive from vesEngineUniform for opacity, but that shouldn't really affect you. </span></pre><pre style="margin-top:0px;margin-bottom:0px">
<span style="color:rgb(0,0,0)"><br></span></pre><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(0,0,0)">- Aashish</span></pre><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(0,0,0)"><br>
</span></pre></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Oct 14, 2013 at 4:24 PM, Aashish Chaudhary <span dir="ltr"><<a href="mailto:aashish.chaudhary@kitware.com" target="_blank">aashish.chaudhary@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear Jon, <div><br></div><div>Let me have a look at the code and will reply back. But in short, you can make your own uniform and use that in the shader, IN other words, </div>
<div>you are bounds of engine uniforms. </div>
<div><br></div><div>I thought we have an API for the engine uniforms, let me make a check on it. </div><div><br></div><div>Thanks,</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div>
<div class="h5">On Mon, Oct 14, 2013 at 2:58 PM, Jon Chmura <span dir="ltr"><<a href="mailto:jon.chmura@me.com" target="_blank">jon.chmura@me.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div style="word-wrap:break-word"><div>I want to set the value of vertexOpacity in vesGourandTexture shader program.</div>
<div><br></div><div><div>/// \file vesGouraudTexture_frag.glsl</div><div>///</div><div>/// \ingroup shaders</div><div><br></div><div>uniform lowp float vertexOpacity;</div><div><br></div></div><div>It is given a default value of 1 in vesEngineUniform. But I can't find any accessors for it as there are for point size, line width, etc.</div>
<span><font color="#888888"><div><br></div><div>
<div style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;font-size:medium;white-space:normal;font-family:Helvetica;word-wrap:break-word;word-spacing:0px">
Jon Chmura</div><div style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;font-size:medium;white-space:normal;font-family:Helvetica;word-wrap:break-word;word-spacing:0px">
<div><a href="mailto:jon.chmura@me.com" target="_blank">jon.chmura@me.com</a></div><div><br></div></div><br><br>
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<br></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br>| Aashish Chaudhary <br>| R&D Engineer <br>| Kitware Inc. <br>| <a href="http://www.kitware.com" target="_blank">www.kitware.com</a>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>| Aashish Chaudhary <br>| R&D Engineer <br>| Kitware Inc. <br>| <a href="http://www.kitware.com">www.kitware.com</a>
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