void gl_triangle(int x0, int y0, int z0, int x1, int y1
, int z1, int x2, int y2, int z2, int bf);
Draws a triangle between the three points 0, 1 and 2.
z0, z1 and z2 are the colors at those points. Hence,
if you set the palette to a grayscale, the triangle
will have an interpolated gray shade.
If you are using
more than 8 bit color, the
z values will be
interpreted as an index to a lookup table of at most
4096 entries long. Each entry is of type
You can set the entries with the function
bf value is used to tell the routine not to draw
the triangle if it is facing the other way.
which way the triangle should be facing to be drawn.
since you will more than likely require both
bf = 0 disables drawing when the points are arranged clockwise,
bf = 1 disables drawing when the points are arranged counter clockwise.
bf = -1 will probably always draw the triangle.
Beware, these functions are not a direct part of the svgalib library.
Instead their source is part of svgalib and can be found in the
threeDkit/ subdirectory of the original svgalib distribution. However, it is not
installed in the system by default, s.t. it is unclear where you can find it
if your svgalib was installed by some
In case of any such problem, simply get an svgalib distribution from the net. Yo
dont need to install it. Just
make in the
threeDkit/ subdirectory. As of this writing,
svgalib-1.2.12.tar.gz is the latest version and can be retrieved by ftp from
sunsite.unc.edu at /pub/Linux/libs/graphics and
tsx-11.mit.edu at /pub/linux/sources/libs which will most probably be mirrored by a site close to you.
The functions are defined in the
tri.o and triangl.o files (or their resp. sources) which you must link to your program.