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
work in progress
multiple leaves, rotation
random leaves
under construction
delta time limit for BG
non scroll mode if isPreview is true
floating leaves
under construction