gl_trisetdrawpoint - Man Page

set a triangle drawing function


#include <triangle.h>

void gl_trisetdrawpoint(void (setpixelfunc) (int x, int y, int color) );


If this function is called with setpixelfunc non-zero, then the function setpixelfunc is used from there after to draw each pixel (instead of the usual direct screen buffer writes).

This function need never be used, except if you want to use your own pixel drawing function for extra effects. If you use this feature, you can be assured that none of the triangle routines will access the hardware, enabling portability to other environments.

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 linux distribution.

In case of any such problem, simply get an svgalib distribution from the net. Yo don't 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 at /pub/Linux/libs/graphics and 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

The functions are defined in the tri.o and triangl.o files (or their resp. sources) which you must link to your program.

See Also

vgagl(7), svgalib(7), threedkit(7), gl_striangle(3), gl_swtriangle(3), gl_triangle(3), gl_trigetcolorlookup(3), gl_trisetcolorlookup(3), gl_wtriangle(3), plane(6), wrapdemo(6).


This manual page was edited by Michael Weller <>. The demos, the initial documentation and the whole threedkit stuff was done by Paul Sheer <>.

Paper mail:

Paul Sheer
P O BOX 890507
Johannesburg 2106
South Africa

Donations (by check or postal order) will be appreciated and will encourage further development of this software. However this is strictly on a voluntary basis where this software falls under the GNU LIBRARY GENERAL PUBLIC LICENSE.

Referenced By

gl_striangle(3), gl_swtriangle(3), gl_triangle(3), gl_trisetcolorlookup(3), gl_wtriangle(3), threedkit(7), vgagl(7).

2 Aug 1997 Svgalib (>= 1.2.11) Svgalib User Manual