Getting useful errors from Cg

Since Cg programs are compiled at the program's runtime, you must catch Cg compile and runtime errors from within your program. Here's how:

First, you will need a callback. Cg will call this function whenver there is an error. Example:

void MyErrorCallback(void) {
CGerror error = cgGetError();
const char* errorString = cgGetErrorString(cgGetError());
printf("Cg error: %s\n", errorString);

// check for compiler errors
if (error == CG_COMPILER_ERROR)
printf("%s\n", cgGetLastListing(context));
}


Next, you need to set the callback:
cgSetErrorCallback(MyErrorCallback);

Now you should get more useful output when Cg has problems.