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--  restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
--  (c)(1)(ii) of the Rights in Technical Data and Computer Software
--  clause at DFARS 252.227-7013 and/or in similar or successor
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--  OpenGL(TM) is a trademark of Silicon Graphics, Inc.
--

with GL; use GL;
with Glut; use Glut;

package body Scenebamb_Procs is
   procedure DoInit is
      ambient : array (0 .. 3) of aliased GLfloat :=
         (0.0, 0.0, 1.0, 1.0);
      diffuse : array (0 .. 3) of aliased GLfloat :=
         (1.0, 1.0, 1.0, 1.0);
      specular : array (0 .. 3) of aliased GLfloat :=
         (1.0, 1.0, 1.0, 1.0);
      position : array (0 .. 3) of aliased GLfloat :=
         (1.0, 1.0, 1.0, 0.0);
   begin
      glLightfv (GL_LIGHT0, GL_AMBIENT, ambient (0)'access);
      glLightfv (GL_LIGHT0, GL_DIFFUSE, diffuse (0)'access);
      glLightfv (GL_LIGHT0, GL_POSITION, position (0)'access);

      glEnable (GL_LIGHTING);
      glEnable (GL_LIGHT0);
      glEnable (GL_DEPTH_TEST);
      glDepthFunc (GL_LESS);
   end DoInit;

   procedure DoDisplay is
   begin
      --  16#4100# = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
      glClear (GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

      glPushMatrix;
      glRotatef (20.0, 1.0, 0.0, 0.0);

      glPushMatrix;
      glTranslatef (-0.75, 0.5, 0.0);
      glRotatef (90.0, 1.0, 0.0, 0.0);
      glutSolidTorus (0.275, 0.85, 15, 15);
      glPopMatrix;

      glPushMatrix;
      glTranslatef (-0.75, -0.5, 0.0);
      glRotatef (270.0, 1.0, 0.0, 0.0);
      glutSolidCone (1.0, 2.0, 15, 15);
      glPopMatrix;

      glPushMatrix;
      glTranslatef (0.75, 0.0, -1.0);
      glutSolidSphere (1.0, 15, 15);
      glPopMatrix;

      glPopMatrix;

      glFlush;
   end DoDisplay;


   procedure ReshapeCallback (w : Integer; h : Integer) is
   begin
      glViewport (0, 0, GLsizei(w), GLsizei(h));
      glMatrixMode (GL_PROJECTION);
      glLoadIdentity;

      if w <= h then
         glOrtho (-2.5, 2.5, GLdouble (-2.5*Float (h)/ Float (w)),
          GLdouble (2.5*Float (h)/Float (w)), -10.0, 10.0);
      else
         glOrtho (GLdouble (-2.5*Float (w)/Float (h)),
          GLdouble (2.5*Float (w)/Float (h)), -2.5, 2.5, -10.0, 10.0);
      end if;

      glMatrixMode (GL_MODELVIEW);
   end ReshapeCallback;
end Scenebamb_Procs;