GF_GL_NB_FRAG_SHADERS   43 src/compositor/visual_manager.h #define GF_GL_NB_FRAG_SHADERS		(1<<(GF_GL_NUM_OF_FLAGS) )	//=2^GF_GL_NUM_OF_FLAGS
GF_GL_NB_FRAG_SHADERS   45 src/compositor/visual_manager.h #define GF_GL_NB_FRAG_SHADERS		(1<<(GF_GL_NUM_OF_FLAGS-1) )	//=2^GF_GL_NUM_OF_FLAGS-1 ( ExternalOES ignored in fragment shader when the platform is not Android)