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POAdditive blending artefacts with OpenGL ES 2.0 on some Android devices
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copied!<p>I am developing a cross-platform game for Android and iOS. For a couple of billboard-like objects I am using additive blending(<code>glBlend(GL_ONE, GL_ONE)</code>) with black background textures. The rendered objects look fine(i.e. the black pixels from the texture look totally transparent) almost everywhere. However on two different Android devices with Adreno GPU's(one Nexus 4 and the other one Sony Xperia Go) I have artefacts like this:<img src="https://i.stack.imgur.com/qwX7K.jpg" alt="enter image description here"> </p> <p>As it is visible with the hamburger icon, the background color bleeds into the rendered quad. I am assuming it is the background color bleeding because the effect is not visible when the billboard quads are directly in front of the background. To make things weirder, the effect is not visible when I take a screenshot from the device, so I have to take a picture of the screen with another camera. I also noticed that the artefacts disappear when I enable <code>Disable HW Overlays</code> from the Android developer settings. Artefacts disappear also when I have another transparent window on the screen, such as the volume slider when I press the volume buttons.</p> <p>When I am rendering my scene, I first render opaque objects in the first pass and then in the second pass I render my transparent billboards with <code>glBlend(GL_ONE, GL_ONE)</code> and with disabling depth-write.</p>

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