Rename the Log Tag
- rename the log tag from OGLSample to OGLESSample
Add more to AndroidAsset Class
- add missing header file
- add missing asset pointer
- add function body
Add delete shader and program
- add glDeleteShader to proper place
- add glDeleteProgram to proper place
Add libpng to project
- add libpng's source code and build for andorid
- update the Android.mk of project
Modify Android.mk to just collect all c and cpp files
- make Android.mk to collect all c and cpp files, but not force write the cpp or c files in it
Bug fix of typo
- typo fix for log.h
Bug fix for Shader
- fragment shader should have precision for float, but vertex shader did not need that
- make shader source code be split by \n, but not a whole bunch of strings in one line
Refactor of GLSLShader
- remove un-necessary handle for vertex and fragment
- make LoadShader() more clear
- add CreateProgram() function
- add log for shader compile error and program link error
Remove some comments
- remove some comments
- fix the outside shader which is just for easy edit
Rename png filename to image filename
- just rename