[Gzz] 10th & 11th (jvk)

[Janne Kujala]

10th: 

Implemented emboss texgen "vertex entry point"

11th: 

Fixed bugs in vertex entry points and implemented fish eye distortion.
"make runfisheye" to test (note: needs GL_NV_vertex_program1_1).

The current implementation just divides the paper into 
a 17x17 mesh and modulates the vertex distance from the 
bulge origin (which should animate better than modulating the
paper coordinates). 

Fisheye parameters: 
        cs1: paper-to-vertex coordinate mapping
        cs2: bulge-to-vertex coordinate mapping
        x0,y0,x1,y1: 
                the region of the paper (in paper coords) 
                that is drawn

Are these ok?


Possible improvements:
        - try to find good grid size based on x0,y0,x1,y1
        - use less vertices where the distortion is close to linear
        - use projective texture mapping 
        - implement distortion in vertex programs
        - use better distortion function
        - do not evaluate points twice 
        
What improvements should be done?


        jvk