GLScene
index is of type Int
CHECK_RET_ERROR, CHECK_SET_ERROR_RET_NIL
DEC_INIT, DEF_INIT, delegate macros.
CGRectWithWH
withLength
lineCount
use error macros
GLTexture bind:target: to handle nil texture case
GLShader prefix for cross-platform shaders
PNG methods return errors instead of throwing exceptions
QKWindow delegate