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--
-- (c) Copyright 1993,1994,1995,1996 Silicon Graphics, Inc.
-- ALL RIGHTS RESERVED
-- Permission to use, copy, modify, and distribute this software for
-- any purpose and without fee is hereby granted, provided that the above
-- copyright notice appear in all copies and that both the copyright notice
-- and this permission notice appear in supporting documentation, and that
-- the name of Silicon Graphics, Inc. not be used in advertising
-- or publicity pertaining to distribution of the software without specific,
-- written prior permission.
--
-- THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
-- AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
-- INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
-- FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
-- GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
-- SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
-- KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
-- LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
-- THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
-- ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
-- ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
-- POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
--
-- US Government Users Restricted Rights
-- Use, duplication, or disclosure by the Government is subject to
-- 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
-- clauses in the FAR or the DOD or NASA FAR Supplement.
-- Unpublished-- rights reserved under the copyright laws of the
-- United States. Contractor/manufacturer is Silicon Graphics,
-- Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
--
-- OpenGL(TM) is a trademark of Silicon Graphics, Inc.
--
with GL; use GL;
with Glut; use Glut;
package body Texgen_Procs is
stripeImage : array (0 .. 95) of aliased GLubyte;
procedure makeStripeImage is
begin
for j in 0 .. 31 loop
if j <= 4 then stripeImage (3*j) := 255;
else stripeImage (3*j) := 0;
end if;
if j > 4 then stripeImage (3*j+1) := 255;
else stripeImage (3*j+1) := 0;
end if;
stripeImage (3*j+2) := 0;
end loop;
end makeStripeImage;
sgenparams : array (0 .. 3) of aliased GLfloat :=
(1.0, 1.0, 1.0, 0.0);
procedure DoInit is
begin
glClearColor (0.0, 0.0, 0.0, 0.0);
makeStripeImage;
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameteri (GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage1D (GL_TEXTURE_1D, 0, 3, 32, 0,
GL_RGB, GL_UNSIGNED_BYTE, stripeImage(0)'Access);
glTexGeni (GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGenfv (GL_S, GL_OBJECT_PLANE, sgenparams (0)'ACCESS);
glEnable (GL_DEPTH_TEST);
glDepthFunc (GL_LESS);
glEnable (GL_TEXTURE_GEN_S);
glEnable (GL_TEXTURE_1D);
glEnable (GL_CULL_FACE);
glEnable (GL_LIGHTING);
glEnable (GL_LIGHT0);
glEnable (GL_AUTO_NORMAL);
glEnable (GL_NORMALIZE);
glFrontFace (GL_CW);
glCullFace (GL_BACK);
glMaterialf (GL_FRONT, GL_SHININESS, 64.0);
end DoInit;
procedure DoDisplay is
begin
glClear (GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
glPushMatrix;
glRotatef (45.0, 0.0, 0.0, 1.0);
glutSolidTeapot (2.0);
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 (-3.5, 3.5, GLdouble (-3.5*GLdouble (h)/GLdouble (w)),
GLdouble (3.5*GLdouble (h)/GLdouble (w)), -3.5, 3.5);
else
glOrtho ((-3.5*GLdouble (w)/GLdouble (h)),
GLdouble (3.5*GLdouble (w)/GLdouble (h)), -3.5, 3.5, -3.5, 3.5);
end if;
glMatrixMode (GL_MODELVIEW);
glLoadIdentity;
end ReshapeCallback;
end Texgen_Procs;
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