Use NS_ENUM instead of typedef enum to eliminate 'ambiguous use' errors
Use NS_ENUM instead of typedef enum to eliminate 'ambiguous use' errors

jakeva/GPUImage,UndaApp/GPUImage,eighteight/GPUImage,PlanetaToBe/GPUImage,birthmark/GPUImage,jakeva/GPUImage,shi-yan/GPUImage,wfxiang08/GPUImage,catbus/GPUImage,eighteight/GPUImage,birthmark/GPUImage,lacyrhoades/GPUImage,lacyrhoades/GPUImage,BradLarson/GPUImage,UndaApp/GPUImage,wysaid/GPUImage,PlanetaToBe/GPUImage,BradLarson/GPUImage,msfeldstein/GPUImage,shi-yan/GPUImage,msfeldstein/GPUImage,wysaid/GPUImage,catbus/GPUImage,wfxiang08/GPUImage,wysaid/GPUImage,eighteight/GPUImage,BradLarson/GPUImage