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POGL_COLOR_MATERIAL with lighting on Android
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  1. POGL_COLOR_MATERIAL with lighting on Android
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    copied!<p>It appears that <a href="http://pyopengl.sourceforge.net/documentation/manual/glColorMaterial.3G.html" rel="nofollow noreferrer"><code>glColorMaterial()</code></a> is absent from <a href="http://www.khronos.org/opengles/sdk/1.1/docs/man/" rel="nofollow noreferrer">OpenGL ES</a>. According to <a href="http://www.idevgames.com/forum/showthread.php?t=18189" rel="nofollow noreferrer">this post</a> (for iPhone), you may still enable <code>GL_COLOR_MATERIAL</code> in OpenGL ES 1.x, but you're stuck with the default settings of <code>GL_FRONT_AND_BACK</code> and <code>GL_AMBIENT_AND_DIFFUSE</code> that you would otherwise set with <code>glColorMaterial()</code>. I would be OK with this, but the diffuse lighting is not working correctly.</p> <p>I set up my scene and tested it with one light, setting <code>glMaterialfv()</code> for <code>GL_AMBIENT</code> and <code>GL_DIFFUSE</code> once in the initialization. The normals have been set correctly, and lighting works the way it's supposed to. I see the Gouraud shading.</p> <p>With <code>GL_LIGHTING</code> disabled, the flat colors I have set with <code>glColor4f()</code> appear on the various objects in the scene. This also functions as expected. However, when <code>glEnable(GL_COLOR_MATERIAL)</code> is called, the flat colors remain. I would expect to see the lighting effects.</p> <p>glColorMaterial() is also <a href="http://www.anddev.org/viewtopic.php?p=33992" rel="nofollow noreferrer">mentioned on anddev.org</a>, but I'm not sure if the information there is accurate.</p> <p>I'm testing this on an Android 2.1 handset (Motorola Droid).</p> <p><strong>Edit</strong>: It works properly on my 1.6 handset (ADP1). I've filed <a href="http://code.google.com/p/android/issues/detail?id=8015" rel="nofollow noreferrer">Issue 8015</a>. It does <strong>not</strong> work with the emulator for Android 1.6 or 2.1.</p> <p>Here is a <a href="http://sites.google.com/site/droidful/bugs/color_material_testcase.zip" rel="nofollow noreferrer">minimal testcase</a> to reproduce the problem.</p> <p><strong>Screenshot on Android 1.6 (ADP1):</strong></p> <p><img src="https://sites.google.com/site/droidful/bugs/GL_COLOR_MATERIAL-1.6.png" alt="alt text"></p> <p><strong>Screenshot of same code running on Android 2.1 (Motorola Droid):</strong></p> <p><img src="https://sites.google.com/site/droidful/bugs/GL_COLOR_MATERIAL-2.1.png" alt="alt text"></p> <p><strong>Screenshot on Android 1.6 (Emulator):</strong></p> <p><img src="https://sites.google.com/site/droidful/bugs/GL_COLOR_MATERIAL-1.6-emulator.png" alt="alt text"></p>
 

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