fglintro man page on IRIX

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fglIntro(3G)		       OpenGL Reference			  fglIntro(3G)

NAME
     - Introduction to OpenGL FORTRAN Bindings

OVERVIEW
     OpenGL is a high-performance 3D-oriented renderer that supersedes IrisGL.
     It is supported on all SGI graphics adaptors except for the G, GT and
     GTX. A number of other workstation and personal computer vendors also
     support OpenGL.

     This manpage contains OpenGL FORTRAN binding specific information.

NOTES
     The FORTRAN bindings naming convention for routines is to prefix each
     OpenGL call with fgl. GL_ prefix is used for the constants.

     The OpenGL FORTRAN bindings header files consist of /usr/include/GL/fgl.h
     and /usr/include/GL/fglu.h, the OpenGL FORTRAN bindings libraries are
     /usr/lib/libfGL.a and /usr/lib/libfGLU.a.

     There are no FORTRAN bindings for X and GLX.

     To determine if a pointer is null, compare it to GL_NULL (which is
     actually an 8-character string).

     Beware of problems with the commands that return strings of potentially
     unlimited length, such as fglGetString. The FORTRAN bindings support only
     limited length strings. If you need to deal with longer strings, you will
     need to write an interface routine that copies the result string into a
     buffer and then returns a token at a time.

EXAMPLES
     Compile with f77 -o sphere sphere.f -lfglut -lfGLU -lfGL -lglut -lGLU
     -lGL -lXmu -lXext -lXi -lX11

     C	GLUT Fortran program to draw red light sphere.

	     subroutine display #include "GL/fgl.h"
	     call fglclear(GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT)
	     call fglcalllist(1)
	     call glutswapbuffers
	     end

	     subroutine gfxinit #include "GL/fgl.h"
	     real diffuse(4),pos(4)
	     data diffuse /1.0, 0.0, 0.0, 1.0/
	     data pos /1.0, 1.0, 1.0, 0.0/
	     call fglnewlist(1, GL_COMPILE)
	     call glutsolidsphere(dble(1.0), 20, 20)

									Page 1

fglIntro(3G)		       OpenGL Reference			  fglIntro(3G)

	     call fglendlist
	     call fgllightfv(GL_LIGHT0, GL_DIFFUSE, diffuse)
	     call fgllightfv(GL_LIGHT0, GL_POSITION, pos)
	     call fglenable(GL_LIGHTING)
	     call fglenable(GL_LIGHT0)
	     call fglenable(GL_DEPTH_TEST)
	     call fglmatrixmode(GL_PROJECTION)
	     call fgluperspective(dble(40.0), dble(1.0),
	  2			  dble(1.0), dble(10.0))
	     call fglmatrixmode(GL_MODELVIEW)
	     call fglulookat(dble(0.0), dble(0.0), dble(5.0),
	  2		     dble(0.0), dble(0.0), dble(0.0),
	  3		     dble(0.0), dble(1.0), dble(1.0))
	     call fgltranslatef(0.0, 0.0, -1.0)
	     end

	     program main #include "GL/fglut.h"
	     external display
	     external reshape
	     external submenu
	     external mainmenu
	     call glutinit
	     call glutinitdisplaymode(GLUT_DOUBLE+GLUT_RGB+GLUT_DEPTH)
	     call glutcreatewindow('Fortran GLUT sphere')
	     call gfxinit
	     call glutdisplayfunc(display)
	     call glutmainloop
	     end

BUGS
     OpenGL FORTRAN bindings may contain unresolved symbols. Adding
     -ignore_unresolved to your compile command line will eliminate the error.

SEE ALSO
     glIntro

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