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Opengl check error macro

In Linux this is not necessary. APIENTRY is defined in the windows. h header, but nowhere in Linux. So you should put this. You make twice as many OpenGL calls. There is overhead for the call itself, as well as for checking and returning the error state. While calling glGetError( ) once may not be very expensive, it adds up if you call it millions of. If the parameters of a function call do not match the set of parameters allowed by OpenGL, or do not interact reasonably with. For most OpenGL errors, and for most OpenGL functions, a function that emits an error will have no effect. This also means that the implementation will not check for errors either. I' ll here describe how to debug OpenGL using the glGetError( ) function in OpenGL 3. x core profile or higher where.

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  • Video:Macro error check

    Check opengl macro

    I have create a small function and a macro which let you check for OpenGL errors using a single command. check glGetError once per frame to be sure there is no error; wrap most GL calls with a macro that can check the GL error code, and only turn it on when the per- frame check fails. Of course, since the attribute methods can be. Yes, there is a better way! 3 and later support the glDebugMessageCallback API, which allows you to specify a function in your app that GL will call to issue a warning or error. In this function you can do whatever. if supported( EXT_ some_ extension) # extension GL_ EXT_ some_ extension: enable # endif. You are trying to write a shader that conditionally uses a certain extension. The correct way to do what you' re trying to do is this:. If OpenGL function returns variable, then remember to declare it outside of GL_ CHECK: const char*. Call glGetError after each call to check for errors, and wrap glGetError so that this checking is transparent to your program. Even though OpenGL' s error enum is terribly vague, most functions can produce more than one type of error.

    It' s nice to be able to see what the value was, even if only to verify your assumption that what' s obviously the case is.