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<font size="2">Hi Sebastian,</font></div>
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<div style="direction: ltr;"><font size="2">Thanks for the reply.<br>
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<div id="divRpF545474" style="direction:ltr"><font face="Tahoma" size="2" color="#000000"><b>From:</b> osg-users [osg-users-bounces@lists.openscenegraph.org] on behalf of Sebastian Messerschmidt [sebastian.messerschmidt@gmx.de]</font></div>
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<div id="divRpF545474" style="direction:ltr"><font face="Tahoma" size="2" color="#000000"><b>Sent:</b> Sunday, March 13, 2016 4:03 AM</font></div>
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<div id="divRpF545474" style="direction:ltr"><font face="Tahoma" size="2" color="#000000"><b>To:</b> OpenSceneGraph Users</font></div>
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<div id="divRpF545474" style="direction:ltr"><font face="Tahoma" size="2" color="#000000"><b>Subject:</b> Re: [osg-users] Running OSG models on OpenGLES2.0</font></div>
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<div class="moz-cite-prefix">Hi Hyun,</div>
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<div style="direction:ltr; font-family:Tahoma; color:#000000; font-size:10pt">Hi Chris,
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<div>I tried most of examples. Now I'm focusing on glsl_simple.osgt as it looks simple, but only the second row of shapes shows. If I modify the vertex shader a little, I get to see both first/second row.</div>
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<div>Can you tell us which platform you are using? You usually don't have to add precision qualifiers to make shaders work.
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I have Xilinx ZynqMP SoC with MALI 400MP, and I'm running Ubuntu on it. I also have Yocto built rootfs. I've integrated the MALI OpenGLES2 library/driver there, and I'm building OSG manually. It fails to compile if I don't add the precision for float & int
in shaders. The OSG build configuration is more or less as below (it's for 3.4.0), with some addition to point to EGL/OPENGLES2 libraries and headers:</div>
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<code class="bash spaces" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; margin:0px!important; outline:0px!important; overflow:visible!important; padding:0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; background:none!important"> </code><code class="bash plain" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; margin:0px!important; outline:0px!important; overflow:visible!important; padding:0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; color:white!important; background:none!important">-DCMAKE_BUILD_TYPE=Release
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<code class="bash spaces" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; margin:0px!important; outline:0px!important; overflow:visible!important; padding:0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; background:none!important"> </code><code class="bash plain" style="font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; border:0px!important; bottom:auto!important; float:none!important; height:auto!important; left:auto!important; margin:0px!important; outline:0px!important; overflow:visible!important; padding:0px!important; position:static!important; right:auto!important; top:auto!important; vertical-align:baseline!important; width:auto!important; min-height:auto!important; color:white!important; background:none!important">-DOPENGL_PROFILE=GLES2
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<div>I've received some OSG model (file.osg) from someone, and I was able to run it on the desktop (OpenGL). I was told the OSG model runs on OpenGLES2.0. For me to run it on OpenGLES2, I added the precision qualifiers to build, but the result still doesn't
look correct. I'm not sure if more / what modification is needed. For example, I modified the OSG shader generator, but it didn't help. Does OSG layers completely abstract underlying APIs (OpenGL, OpenGLES,,,), meaning the OSG models are API independent? or
does each OSG model have some API specific code? For example, I don't see any precision qualifiers in OSG examples, and does that mean those models are not for OpenGLES2.0?</div>
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<div>OSG doesn't completely abstract the APIs, but it can be built specifically to work with OpenGL ES, by using the compiler flags you used. You will however have to put some work into it, since you will have to write shaders. Since you are not telling us
which "shader generator" you are using, it is hard to guess what you are trying to achieve.
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<div>There is not something like "models for OpenGLES2.0". You will have to write appropriate shaders and might have to run some visitors to change fixed function pipeline functions in to uniforms/attributes of the model.</div>
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<div>For instance osg::Material is not working outside the compatibility -profiles, so might have to run a visitor, that parses osg::Material instances and replaces them with uniforms or per-vertex attributes which you will have to evaluate in the shader.
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<div>I'm trying to figure out where the issue comes from: OSG model, OSG layers, OpenGLES library.</div>
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<div>Chris asked you for an example model that is not working. You mentioned the glsl-simple model, which from a glance doesn't have ES-compatible code. The easiest thing to do is to start with a model(preferably not containing shaders) and a simple ES-Shader.</div>
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<div>Unfortunately the examples here are relatively rare. Might be a great opportunity to create some minimalistic core/ES-based shader example and to extend the OpenGL-ES pseudo loader.
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<font face="Times New Roman" size="3">If there are already OSG models confirmed to work with OpenGLES2, I'd use those to validate my platform. But, none of examples in OpenSceneGraph-Data shows correct results on my platform </font><span style="font-family: 'Times New Roman'; font-size: medium;">(nothing
displayed except the glsl_simple.osgt)</span><span style="font-family: 'Times New Roman'; font-size: medium;"> </span><span style="font-family: 'Times New Roman'; font-size: medium;">comparing to results from desktop with OpenGL. Once my platform is confirmed
to work, I will be able to focus on debugging the model. With lack of OSG / shader experience, I can't easily tell where the issue comes from, and I'm looking for references for validation.</span></div>
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<div><font face="Times New Roman" size="3">Thanks,</font></div>
<div><font face="Times New Roman" size="3">-hyun<br>
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<div>Thanks,</div>
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<div>-hyun </div>
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<div>Cheers</div>
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<div>Sebastian </div>
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<div id="divRpF374469" style="direction:ltr"><font color="#000000" size="2" face="Tahoma"><b>From:</b> osg-users [<a class="moz-txt-link-abbreviated" href="mailto:osg-users-bounces@lists.openscenegraph.org" target="_blank">osg-users-bounces@lists.openscenegraph.org</a>]
on behalf of Chris Hanson [<a class="moz-txt-link-abbreviated" href="mailto:xenon@alphapixel.com" target="_blank">xenon@alphapixel.com</a>]</font></div>
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<div id="divRpF374469" style="direction:ltr"><font color="#000000" size="2" face="Tahoma"><b>Sent:</b> Friday, March 11, 2016 5:27 PM</font></div>
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<div id="divRpF374469" style="direction:ltr"><font color="#000000" size="2" face="Tahoma"><b>To:</b> OpenSceneGraph Users</font></div>
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<div id="divRpF374469" style="direction:ltr"><font color="#000000" size="2" face="Tahoma"><b>Subject:</b> Re: [osg-users] Running OSG models on OpenGLES2.0</font></div>
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<div dir="ltr">OGL ES requires a shader. </div>
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<div>Many of the OSG-Data models don't have shaders built into them, and will not transform and rasterize as a result.</div>
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<div>Which OSG model did you try that had most surfaces transparent?</div>
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<pre>_______________________________________________</pre>
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<pre>osg-users mailing list</pre>
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<pre><a class="moz-txt-link-abbreviated" href="mailto:osg-users@lists.openscenegraph.org" target="_blank">osg-users@lists.openscenegraph.org</a></pre>
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<pre><a class="moz-txt-link-freetext" href="http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org" target="_blank">http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org</a></pre>
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