iOS, Cocos2d-iphone: Can any tell me what are these codes @“”?

Question

static NSString *CCDrawNodeHWTransformVertexShaderSource =
    @"uniform highp mat4 u_MVP;\n"
    @"uniform highp vec4 u_TintColor;\n"
    @"void main(){\n"
    @"  gl_Position = u_MVP*cc_Position;\n"
    @"  cc_FragColor = clamp(u_TintColor*cc_Color, 0.0, 1.0);\n"
    @"  cc_FragTexCoord1 = cc_TexCoord1;\n"
    @"}\n";

I got some errors in using cocos2d-iphone and xcode 7 and found the above code.

The error message:

Objects/CCMetalShaders/CCShaders.air: No such file or directory

What are the @"" codes? seems like they are opengl es or some c language? Can anyone points me to a direction of what they are and how can I learn more about them? Thank you.

Answer 1

try to set your Deployment target above 6

It works for me, at least..)