gluProject and gluUnproject source (for float data)

Hi… does anyone have the source for GLU functions gluProject and gluUnProject???

I want to create float versions of them so I do not need to convert my matrices to double every frame. I made a float version of gluProject and it matches the results from the original double version. Here it is:

void gluProject_float(const vector3& p_obj, vector3& p_win)
{
    vector4 t;
    t = p_obj * view_matrix; // v3 * m(4x3)
    t = t * proj_matrix; // v4 * m(4x4)
    p_win.x = win_sizex * (t.x / t.w + 1.0f) * 0.5f;
    p_win.y = win_sizey * (t.y / t.w + 1.0f) * 0.5f;
    p_win.z = (t.z / t.w + 1.0f) * 0.5f;
}

But can not find any info on how to implement gluUnProject. Any links for its definition or implementation in GLU???

I need this for a deferred shading demo … works ok when converting to double before gluUnProject but think a float version would be nice as I do not use double anywere else.

Your code for gluProject looks weird.
Shouldn’t that be

vector4 t;
t = view_matrix * p_obj; // v3 * m(4x3)
t = proj_matrix * t; // v4 * m(4x4)

I have a lib that is a a glu replacement
http://www.geocities.com/vmelkon/glhlibrary.html

The functions you would be interested in

1. glhProjectd
2. glhProjectf
3. glhUnProjectd
4. glhUnProjectf
5. glhProjectf_2
6. glhProjectf_3
7. glhUnProjectf_2
8. glhUnProjectf_3
9. glhProjectf_SSE_Aligned_2
10. glhProjectf_SSE_Aligned_WarmCache_2
11. glhProjectf_SSE_Unaligned_2
12. glhUnProjectf_SSE_Aligned_2
13. glhUnProjectf_SSE_Aligned_WarmCache_2
14. glhUnProjectf_SSE_Unaligned_2

The 5 to 14 are for mass processing.

The source for the original GLU can be found in MESA (mesa3d.org)

Go to http://www.mesa3d.org and get the latest source for the Mesa library, which includes its own version of libGLU, as well as SGI’s implementation.

Look at:

Mesa-6.2.1\src\glu\sgi\libutil\project.c

and/or

Mesa-6.2.1\src\glu\mesa\project.c

Don.

Thanks for the links and the quick reply.

V-man, the (matrix * vector) or (vertor * matrix) would be the same thing… anyway that was just a pseudo code not my actual code.

And thanks again for the library and source link.