OpenGL Source Code Generator

Moderator

Posts: 529
Joined: 2003.03

Post: #1

Jul 5, 2005 — 11:13 AM

If this does what I think it does, this is somewhat interesting.

http://translate.google.com/translate?hl...s%26sa%3DN

Perhaps someone here Sprechen zie Deutsche? Google's translations leave something to be desired.

"Yes, well, that's the sort of blinkered, Philistine pig-ignorance I've come to expect from you non-creative garbage."

NCarter

Moderator

Posts: 365
Joined: 2002.04

Post: #2

Jul 5, 2005 — 11:33 AM

I assume this is a program which takes files from existing 3D model formats and exports C source code which generates the appropriate shape in OpenGL. Is that what you're thinking, or am I missing something?

Luckily, this kind of thing already exists on the Mac. Cheetah 3D can export C headers full of data arrays for OpenGL, complete with helpful comments detailing how to use it.

For example, a cube:

Code:

// Headerfile *.h (generated by Cheetah3D)

//

// There are the following name conventions:

//     NAME            =name of the object in Cheetah3D. Caution!! Avoid giving two objects the same name

//     NAME_vertex        =float array which contains the vertex,normal and uvcoord data 

//     NAME_index        =int array which contains the polygon index data

//     NAME_vertexcount    =number of vertices

//     NAME_polygoncount    =number of triangles

//

// The vertex data is saved in the following format:

//     u0,v0,normalx0,normaly0,normalz0,x0,y0,z0

//     u1,v1,normalx1,normaly1,normalz1,x1,y1,z1

//     u2,v2,normalx2,normaly2,normalz2,x2,y2,z2

//     ...

// You can draw the mesh the following way:

//     glEnableClientState(GL_INDEX_ARRAY);

//     glEnableClientState(GL_NORMAL_ARRAY);

//     glEnableClientState(GL_VERTEX_ARRAY);

//     glEnableClientState(GL_TEXTURE_COORD_ARRAY);

//     glInterleavedArrays(GL_T2F_N3F_V3F,0,NAME_vertex);

//     glDrawElements(GL_TRIANGLES,NAME_polygoncount*3,GL_UNSIGNED_INT,NAME_index)​;

//

#define Box_vertexcount     24

#define Box_polygoncount     12

float Box_vertex[Box_vertexcount][8]={

        {0.00000, 0.00000, 0.00000, 0.00000, 1.00000, -0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, 1.00000, -0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, 1.00000, 0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, 1.00000, 0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, -1.00000, 0.50000, -0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, -1.00000, 0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, -1.00000, -0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 0.00000, -1.00000, -0.50000, -0.50000, -0.50000},

        {0.00000, 0.00000, -1.00000, 0.00000, 0.00000, -0.50000, -0.50000, -0.50000},

        {0.00000, 0.00000, -1.00000, 0.00000, 0.00000, -0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, -1.00000, 0.00000, 0.00000, -0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, -1.00000, 0.00000, 0.00000, -0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 1.00000, 0.00000, 0.00000, 0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 1.00000, 0.00000, 0.00000, 0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, 1.00000, 0.00000, 0.00000, 0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, 1.00000, 0.00000, 0.00000, 0.50000, -0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 1.00000, 0.00000, -0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, 1.00000, 0.00000, -0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 1.00000, 0.00000, 0.50000, 0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, 1.00000, 0.00000, 0.50000, 0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, -1.00000, 0.00000, -0.50000, -0.50000, -0.50000},

        {0.00000, 0.00000, 0.00000, -1.00000, 0.00000, -0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, -1.00000, 0.00000, 0.50000, -0.50000, 0.50000},

        {0.00000, 0.00000, 0.00000, -1.00000, 0.00000, 0.50000, -0.50000, -0.50000},

        };

int Box_index[Box_polygoncount][3]={

        {0, 1, 2},

        {2, 3, 0},

        {4, 5, 6},

        {6, 7, 4},

        {8, 9, 10},

        {10, 11, 8},

        {12, 13, 14},

        {14, 15, 12},

        {16, 17, 18},

        {18, 19, 16},

        {20, 21, 22},

        {22, 23, 20},

        };

EDIT: on closer inspection, it looks like this OpenGL Source Code Generator also does something useful with attributes, and I don't think Cheetah 3D does that.

Neil Carter
Nether - Mac games and comic art

Cochrane

Member

Posts: 114
Joined: 2005.03

Post: #3

Jul 5, 2005 — 11:55 AM

This is not a finished code generator, it is a product requirement specification for such a code generator, which would have to be built by the people attending this particular course.

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