polygon3d_base.cpp

typedef struct V3D
      {
         fixed x, y, z;       - position
         fixed u, v;          - texture map coordinates
         int c;               - color
      } V3D;

void do_polygon3dr(BITMAP *bmp, int i, int *sdci, int xoffset, int yoffset)
{
    //sdci[1]=layer
    //sdci[2]=pos[12]
    //sdci[3]=uv[8]
    //sdci[4]=color[4]
    //sdci[5]=size[2]
    //sdci[6]=flip
    //sdci[7]=tile/combo
    //sdci[8]=polytype

    std::vector<long>* v_ptr = (std::vector<long>*)script_drawing_commands[i].GetPtr();

    if(!v_ptr)
    {
        al_trace("Quad3d: Vector pointer is null! Internal error. \n");
        return;
    }

    std::vector<long> &v = *v_ptr;

    if(v.empty())
        return;

    long* pos = &v[0];
    long* uv = &v[12];
    long* col = &v[20];
    long* size = &v[24];

    int w = size[0]; //magic numerical constants... yuck.
    int h = size[1];
    int flip = (sdci[6]/10000)&3;
    int tile = sdci[7]/10000;
    int polytype = sdci[8]/10000;

    polytype = vbound(polytype, 0, 14);

    if(((w-1) & w) != 0 || ((h-1) & h) != 0) return;   //non power of two error

    int tex_width = w*16;
    int tex_height = h*16;

    bool mustDestroyBmp = false;
    BITMAP *tex = script_drawing_commands.GetSmallTextureBitmap(w,h);

    if(!tex)
    {
        mustDestroyBmp = true;
        tex = create_bitmap_ex(8, tex_width, tex_height);
        clear_bitmap(tex);
    }

    if(tile > 0)   // TILE
    {
        TileHelper::OverTile(tex, tile, 0, 0, w, h, col[0], flip);
    }
    else        // COMBO
    {
        const newcombo & c = combobuf[ vbound(abs(tile), 0, 0xffff) ];
        const int tiletodraw = combo_tile(c, 0, 0);
        flip = flip ^ c.flip;

        TileHelper::OldPutTile(tex, tiletodraw, 0, 0, w, h, col[0], flip);
    }

    V3D_f V1 = { static_cast<float>(pos[0]+xoffset), static_cast<float>(pos[1] +yoffset), static_cast<float>(pos[2]),  static_cast<float>(uv[0]), static_cast<float>(uv[1]), col[0] };
    V3D_f V2 = { static_cast<float>(pos[3]+xoffset), static_cast<float>(pos[4] +yoffset), static_cast<float>(pos[5]),  static_cast<float>(uv[2]), static_cast<float>(uv[3]), col[1] };
    V3D_f V3 = { static_cast<float>(pos[6]+xoffset), static_cast<float>(pos[7] +yoffset), static_cast<float>(pos[8]),  static_cast<float>(uv[4]), static_cast<float>(uv[5]), col[2] };
    V3D_f V4 = { static_cast<float>(pos[9]+xoffset), static_cast<float>(pos[10]+yoffset), static_cast<float>(pos[11]), static_cast<float>(uv[6]), static_cast<float>(uv[7]), col[3] };

    quad3d_f(bmp, polytype, tex, &V1, &V2, &V3, &V4);

    if(mustDestroyBmp)
        destroy_bitmap(tex);

}