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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-- Unpublished-- rights reserved under the copyright laws of the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 System; use System;
with GL; use GL;
with Ada.Numerics; use Ada.Numerics;
with Ada.Numerics.Generic_Elementary_Functions;
package body Texturesurf_Procs is
package GLdouble_GEF is new
Generic_Elementary_Functions (GLfloat);
use GLdouble_GEF;
ctrlpoints : array (0 .. 3, 0 .. 3, 0 .. 2) of aliased GLfloat :=
(((-1.5, -1.5, 4.0), (-0.5, -1.5, 2.0),
(0.5, -1.5, -1.0), (1.5, -1.5, 2.0)),
((-1.5, -0.5, 1.0), (-0.5, -0.5, 3.0),
(0.5, -0.5, 0.0), (1.5, -0.5, -1.0)),
((-1.5, 0.5, 4.0), (-0.5, 0.5, 0.0),
(0.5, 0.5, 3.0), (1.5, 0.5, 4.0)),
((-1.5, 1.5, -2.0), (-0.5, 1.5, -2.0),
(0.5, 1.5, 0.0), (1.5, 1.5, -1.0)));
texpts : array (0 .. 1, 0 .. 1, 0 .. 1) of aliased GLfloat :=
(((0.0, 0.0), (0.0, 1.0)), ((1.0, 0.0), (1.0, 1.0)));
imageWidth : constant := 64;
imageHeight : constant := 64;
image : array (Integer range 0 .. (3*imageWidth*imageHeight))
of aliased GLubyte;
procedure makeImage is
ti, tj : GLfloat;
begin
for i in 0 .. (imageWidth - 1) loop
ti := 2.0*Pi*GLfloat (i)/GLfloat (imageWidth);
for j in 0 .. (imageHeight - 1) loop
tj := 2.0*Pi*GLfloat (j)/GLfloat (imageHeight);
image (3 * (imageHeight * i + j)) :=
GLubyte (127.0 * (1.0 + Sin (ti)));
image (3 * (imageHeight * i + j) + 1) :=
GLubyte (127.0 * (1.0 + Cos (2.0 * tj)));
image (3 * (imageHeight * i + j) + 2) :=
GLubyte (127.0 * (1.0 + Cos (ti + tj)));
end loop;
end loop;
end makeImage;
procedure DoInit is
begin
glMap2f (GL_MAP2_VERTEX_3, 0.0, 1.0, 3, 4,
0.0, 1.0, 12, 4, ctrlpoints (0, 0, 0)'Access);
glMap2f (GL_MAP2_TEXTURE_COORD_2, 0.0, 1.0, 2, 2,
0.0, 1.0, 4, 2, texpts (0, 0, 0)'Access);
glEnable (GL_MAP2_TEXTURE_COORD_2);
glEnable (GL_MAP2_VERTEX_3);
glMapGrid2f (20, 0.0, 1.0, 20, 0.0, 1.0);
makeImage;
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, 3, imageWidth, imageHeight, 0,
GL_RGB, GL_UNSIGNED_BYTE, image(0)'Access);
glEnable (GL_TEXTURE_2D);
glEnable (GL_DEPTH_TEST);
glEnable (GL_NORMALIZE);
glShadeModel (GL_FLAT);
end DoInit;
procedure DoDisplay is
begin
glClear (GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);
glEvalMesh2 (GL_FILL, 0, 20, 0, 20);
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 (-4.0, 4.0, GLdouble (-4.0*GLdouble (h)/GLdouble (w)),
GLdouble (4.0*GLdouble (h)/GLdouble (w)), -4.0, 4.0);
else
glOrtho ((-4.0*GLdouble (w)/GLdouble (h)),
GLdouble (4.0*GLdouble (w)/GLdouble (h)), -4.0, 4.0, -4.0, 4.0);
end if;
glMatrixMode (GL_MODELVIEW);
glLoadIdentity;
glRotatef (85.0, 1.0, 1.0, 1.0);
end ReshapeCallback;
end Texturesurf_Procs;
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