draw a stupid rectangle with GL ES
with basic texture working
The opengl grey-scale can barely work
Using resource for vertex/fragment shader
Using TextureView instead of GLSurfaceView
1) using wait() in thread to avoid wasting cpu 2)Add more basic filters
9 patch display
add some more filters
using clear preview for zoom in
Create README.md
Update README.md
Merge pull request #1 from fortdam/opengl_dev

merge opengl implementation to master branch