问题
I'm using my own GLSurfaceView and have been struggling with crashes related to the EGL config chooser for a while.
It seems as though requesting RGB_565 by calling setEGLConfigChooser(5, 6, 5, 0, 16, 0) should be the most supported. However, running this code on the emulator using host GPU I still get a crash, seemingly because my graphics card does not natively support RGB_565. Setting to RGBA_8888 by calling setEGLConfigChooser(8, 8, 8, 8, 16, 0) seems to run fine on my emulator and HTC Rezound device, but I'm seeing a small number of crash reports in the market still.
My guess is that most phones support RGBA_8888 natively now but a small number of my users have phones which are only compatible with RGB_565, which prevents my config chooser from getting a config.
Seeing as how I don't need the alpha channel, is there a right way to try RGBA_8888 first and then fall back to RGB_565? Is there a cleaner way to just ask for any ol' config without caring about the alpha value?
I saw a possible solution to determine ahead of time what the default display config was and request that specifically here: https://stackoverflow.com/a/20918779/234256. Unfortunately, it looks like the suggested getPixelFormat function is deprecated as of API level 17.
回答1:
From my experience I do not think setEGLConfigChooser() actually works correctly, i.e. it has a bug in its implementation. Across a number of devices I have seen crashes where setEGLConfigChooser() fails to select a valid context even if the underlying surface is of the correct type.
I have found the only reliable way to choose an EGL context is with a custom EGLConfigChooser. This also has the added benefit of choosing a config based on your own rules, e.g. surface must have depth and preferably RGB888 but can settle for RGB565. This is actually pretty straightforward to use eglChooseConfig() to get a list of possible configurations and then return one of them that matches your selection criteria.
回答2:
This gsoc code sample is for enabling MSAA. But it also contains code to select configurations, checking if they are available.
https://code.google.com/p/gdc2011-android-opengl/source/browse/trunk/src/com/example/gdc11/MultisampleConfigChooser.java#90
来源：https://stackoverflow.com/questions/24741584/what-is-the-right-way-to-choose-an-egl-config-in-android