autumn ver
handle EGL_CONTEXT_LOST
translate texts of link to Play Store
divide settings into categories
typo
Update strings.xml
description texts
too long to fit in, shorten the description
transfer map
more better selection of precision

- highp(f32) is used by most major android GPUs in vertex shader
- Mali always uses mediump(f16) in fragment shader
draw leaves (work in progress)
works in progress
print errors of glLinkProgram
fix wrong order
draw textures
discard pixel if the alpha = 0
alpha blend
Android.mk to compile
[test] draw a leaf
wrong calculation of view matrix -- the given offset must int the range of -1 to 1