I have a problem with setting up OpenGL ES 1.1 with alpha channel support. First of all: I need an alpha channel within OpenGL ES for performing alpha masking and blending effects. My game uses a texture with alpha channel for masking another texture. This only happens to work when I initialize OpenGL ES with the following configuration:
glView.setEGLConfigChooser(8, 8, 8, 8, 0, 8); I could use the stencil buffer instead and parts of my game do that, too. However, my Nexus 7 tablet crashes pretty hard with a colorfully distorted screen when I use the stencil buffer in conjunction with alpha testing (which is necessary for discarding transparent pixels in the masking texture): gl.glEnable(GL10.GL_ALPHA_TEST); gl.glAlphaFunc(GL10.GL_GREATER, 0.05f); Romain Guy says here<https://groups.google.com/d/msg/android-developers/enRw0sImmN0/uXPWFJ7fQzcJ>that the alpha channel set in setEGLConfigChooser does not need to be used unless the window is translucent. However, when I compile my game with: glView.setEGLConfigChooser(8, 8, 8, 0, 0, 8); // alpha = 0 My texture masking effect does not work anymore. Instead I can only see the unmasked texture hovering as a square on the screen. All other textures with alpha channel are rendered correctly but only when I don't try to alpha-mask them. I could leave the configuration with 8 bits alpha channel. However, then I get on some older devices crashes with an EGL_BAD_MATCH error because their surface view apparently only supports RGB565 or maybe even something worse than that. I tried fixing the problem as follows: glView.setEGLConfigChooser(5, 6, 5, 8, 0, 8); But that does not work either (config chooser cannot find a matching configuration). What can I do in this situation? How can I keep my alpha channel within OpenGL ES (I don't need it for the surface nor the window) and make older devices happy without crashing right on initialization? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
