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Editorial Team
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Asked: 2026-05-21T23:05:26+00:00

I need to draw a bitmap on top of a completely rendered GLSurfaceView. By

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I need to draw a bitmap on top of a completely rendered GLSurfaceView. By completely rendered I mean that the entire thing is filled with colorized triangles. Obviously the bitmap will hide the triangles underneath it, but I would like to minimize how much is hidden.
enter image description here

The bitmap is 64×64 pixels and has many empty areas that are translucent in the PNG file. When I draw the bitmap by making a square with two triangles, the translucent areas become black (the green areas in the picture above), perhaps because the app background is black. Is there an easy way to get the translucent areas to not affect the image (the second image above)? Do I need to create a complex set of triangles that exactly outlines the non-translucent parts when I render the bitmap?

I am developing on a Motorola Xoom, Android 3.0. Thanks for your time.

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1 Answer

  1. Editorial Team

    Use the alpha test.

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