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! GLUT Fortran program to render simple red scene.
! This is a fortran 90 program in fixed source form.
! In a risky move, this program assumes that the default kind of
! integer is the same as glint and glsizei and also that the
! default real is the same kind as glfloat
module fscene_callbacks
use opengl_gl
use opengl_glu
use opengl_glut
private
public :: display, freshape, submenu, mainmenu, myinit
contains
subroutine display()
call glclear(GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT)
call glpushmatrix()
call glscalef(1.3, 1.3, 1.3)
call glrotatef(20.0, 1.0, 0.0, 0.0)
call glpushmatrix()
call gltranslatef(-0.75, 0.5, 0.0)
call glrotatef(90.0, 1.0, 0.0, 0.0)
call glutsolidtorus(0.275_gldouble, 0.85_gldouble, 10, 15)
call glpopmatrix()
call glpushmatrix()
call gltranslatef(-0.75, -0.5, 0.0)
call glrotatef(270.0, 1.0, 0.0, 0.0)
call glutsolidtetrahedron()
call glpopmatrix()
call glpushmatrix()
call gltranslatef(0.75, 0.0, -1.0)
call glutsolidicosahedron()
call glpopmatrix()
call glpopmatrix()
call glflush()
return
end subroutine display
subroutine freshape(w,h)
integer, intent(in out) :: w,h
real(kind=gldouble) :: wr,hr,d
call glviewport(0, 0, w, h)
call glmatrixmode(GL_PROJECTION)
call glloadidentity()
wr = w
hr = h
d = 1.0_gldouble
if ( w <= h ) then
call glortho(-2.5_gldouble, 2.5_gldouble, &
-2.5_gldouble * hr/wr, 2.5_gldouble * hr/wr, &
-10.0_gldouble, 10.0_gldouble)
else
call glortho(-2.5_gldouble * hr/wr, &
2.5_gldouble * hr/wr, &
-2.5_gldouble, 2.5_gldouble, -10.0_gldouble, &
10.0_gldouble)
end if
call glmatrixmode(GL_MODELVIEW)
return
end subroutine freshape
subroutine submenu(value)
integer, intent(in out) :: value
if ( value == 1 ) then
call glenable(GL_DEPTH_TEST)
call glenable(GL_LIGHTING)
call gldisable(GL_BLEND)
call glpolygonmode(GL_FRONT_AND_BACK, GL_FILL)
else
call gldisable(GL_DEPTH_TEST)
call gldisable(GL_LIGHTING)
call glcolor3f(1.0, 1.0, 1.0)
call glpolygonmode(GL_FRONT_AND_BACK, GL_LINE)
call glenable(GL_LINE_SMOOTH)
call glenable(GL_BLEND)
call glblendfunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
end if
call glutpostredisplay()
return
end subroutine submenu
subroutine mainmenu(value)
integer, intent(in out) :: value
if (value == 666) then
stop
end if
return
end subroutine mainmenu
subroutine myinit()
real(kind=glfloat), dimension(4), save :: lambient = (/0.0, 0.0, 0.0, 1.0/)
real(kind=glfloat), dimension(4), save :: ldiffuse = (/1.0, 0.0, 0.0, 1.0/)
real(kind=glfloat), dimension(4), save :: lspecular = (/1.0, 1.0, 1.0, 1.0/)
real(kind=glfloat), dimension(4), save :: lposition = (/1.0, 1.0, 1.0, 0.0/)
call gllightfv(GL_LIGHT0, GL_AMBIENT, lambient)
call gllightfv(GL_LIGHT0, GL_DIFFUSE, ldiffuse)
call gllightfv(GL_LIGHT0, GL_SPECULAR, lspecular)
call gllightfv(GL_LIGHT0, GL_POSITION, lposition)
call glenable(GL_LIGHT0)
call gldepthfunc(GL_LESS)
call glenable(GL_DEPTH_TEST)
call glenable(GL_LIGHTING)
return
end subroutine myinit
end module fscene_callbacks
program fscene
use fscene_callbacks
use opengl_gl
use opengl_glu
use opengl_glut
implicit none
integer :: i,j
call glutinitwindowposition(500,500)
call glutinitwindowsize(500,500)
call glutinit()
i = glutcreatewindow("Fortran GLUT program")
call myinit()
call glutdisplayfunc(display)
call glutreshapefunc(freshape)
call glutcreatemenu(submenu,i)
call glutaddmenuentry("Filled", 1)
call glutaddmenuentry("Outline", 2)
call glutcreatemenu(mainmenu,j)
call glutaddsubmenu("Polygon mode",i)
call glutaddmenuentry("Quit", 666)
call glutattachmenu(GLUT_RIGHT_BUTTON)
call glutmainloop()
stop
end program fscene
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