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subroutine output(x,y,s)
use opengl_gl
use opengl_glut
real :: x,y
character :: s*(*)
character :: c
integer :: i,lenc
call glrasterpos2f(x,y)
lenc = len(s)
do i=1,lenc
c = s(i:i)
call glutbitmapcharacter(GLUT_BITMAP_TIMES_ROMAN_24, &
ichar(c))
end do
end subroutine output
subroutine display
use opengl_gl
call glclear(GL_COLOR_BUFFER_BIT)
call output(0.0,24.0, &
'This is written in a GLUT bitmap font.')
call output(100.0,100.0,'ABCDEFGabcdefg')
call output(50.0,145.0, &
'(positioned in pixels with upper-left origin)')
call glflush
end subroutine display
subroutine reshape(w,h)
use opengl_gl
use opengl_glu
integer, intent(inout) :: w, h
call glviewport(0, 0, w, h)
call glmatrixmode(GL_PROJECTION)
call glloadidentity
call gluortho2d(dble(0.0), dble(w), dble(0.0), dble(h))
call glscalef(1.0, -1.0, 1.0)
call gltranslatef(real(0.0), real(-h), real(0.0))
call glmatrixmode(GL_MODELVIEW)
end subroutine reshape
program main
use opengl_glut
use opengl_gl
implicit none
integer :: win
interface
subroutine display()
end subroutine display
subroutine reshape(w,h)
integer, intent(inout):: w, h
end subroutine reshape
end interface
call glutinitdisplaymode(GLUT_RGB + GLUT_SINGLE)
call glutinitwindowsize(500, 150)
call glutinit
win = glutcreatewindow('Fortran GLUT bitmap A')
call glclearcolor(0.0, 0.0, 0.0, 1.0)
call glutdisplayfunc(display)
call glutreshapefunc(reshape)
call glutmainloop
end program main
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