typecasting question | GameDev.net

quote:
Original post by Theses

i''m just wondering for any function say for example here
glColor3f
which has 3 parameters all floats
now for the question
is there any difference between
glColor3f(1.0, 1.0, 1.0);
and
glColor3f(1.0f, 1.0f, 1.0f);
or in other words does this promotion to double have any effect on the first one

Depends on the compiler, if it sticks to its guns, the first one will store the 1.0''s as doubles in ram, and convert them to floating points before each function call (SLOW!)- the second one will just call the funcion with the fp values.

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