Question

I have a texture. It is JPEG file, with a red RGB(255,0,0) background. What is the best way, to load this texture(or show) where my RGB(255,0,0) colors be TRANSPARENT?

Answer 1

Well jpegs don’t have a transparency channel (AFAIK) so the first thing to do is edit it in Paint.NET or whatever, use magic wand or similar to make your red pixels transparent, and save as a PNG.

At runtime you need to load the PNG from assets or resources into a Bitmap.Config.ARGB_8888 bitmap before converting to a texture.

Finally your GLSurfaceView view needs to explicitly request that it’s translucent cos its opaque by default… here’s what I do in my GLSurfaceView-derived constructor, before calling setRenderer():

    // Make the surface transparent, which it isn't by default
    setEGLConfigChooser(8, 8, 8, 8, 0, 0); 
    getHolder().setFormat(PixelFormat.TRANSLUCENT);