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vector class returning valid glVertex3f params

Started by FlyingDemon Apr 19, 2004 at 11:40 PM 3 replies 300+ views

Original Post

Apr 19, 2004 at 11:40 PM

how would i get my vector class to return a valid variable(s) to use in OpenGL. eg. class Vector{ public: float x, y, z; blah... }; how can i make a function that makes it possible to use my vector class like this: Vector vec; glVertex3f(vec); or glVertex3f(vec.ReturnGL3F) to be used instead of glVertex3f(vec.x, vec.y, vec.z); i''ve tried so many different ways but i just cant get it to work.

SiCrane

Apr 19, 2004 at 11:43 PM

Did you try something like:


void glVertex(const Vector & vec) {
  glVertex3f(vec.x, vec.y, vec.z);
}

FlyingDemon

Apr 19, 2004 at 11:53 PM

yes, but things get confusing whem im using values from a vector and values from somewere else like 2dvectors (float var[2]) and other raw data that wasn't arranged in vectors. I forgot to put the 3f on the openGl functions and also forgot to remove the 3f on that function, thats how it got confussing.

[edited by - FlyingDemon on April 19, 2004 12:55:56 AM]

Sneftel

Apr 20, 2004 at 12:08 AM

How 'bout:


class Vector
{
public:
    union
    {
        struct
        {
            float x, y, z;
        };
        float xyz[3];
    };
};

Vector vec;
glVertex3fv(vec.xyz);

Unnamed structs aren't technically part of the standard (tho for all I know they were added in c++0x), but both GCC and MSVC++ support them.

"Sneftel is correct, if rather vulgar." --Flarelocke

[edited by - sneftel on April 20, 2004 1:08:47 AM]

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