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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-- Unpublished-- rights reserved under the copyright laws of the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 GLU; use GLU;
with GLUT; use GLUT;
with Text_IO;
package body PickDepth_Procs is
package tio renames Text_IO;
procedure DoInit is
begin
glClearColor (0.0, 0.0, 0.0, 0.0);
glDepthFunc (GL_LESS);
glEnable (GL_DEPTH_TEST);
glShadeModel (GL_FLAT);
glDepthRange (0.0, 1.0);
end DoInit;
procedure DrawRects (mode : RenderingMode) is
begin
if mode = GL_SELECT then glLoadName (1); end if;
glBegin (GL_QUADS);
glColor3f (1.0, 1.0, 0.0);
glVertex3i (2, 0, 0);
glVertex3i (2, 6, 0);
glVertex3i (6, 6, 0);
glVertex3i (6, 0, 0);
glEnd;
if mode = GL_SELECT then glLoadName (2); end if;
glBegin (GL_QUADS);
glColor3f (0.0, 1.0, 1.0);
glVertex3i (3, 2, -1);
glVertex3i (3, 8, -1);
glVertex3i (8, 8, -1);
glVertex3i (8, 2, -1);
glEnd;
if mode = GL_SELECT then glLoadName (3); end if;
glBegin (GL_QUADS);
glColor3f (1.0, 0.0, 1.0);
glVertex3i (0, 2, -2);
glVertex3i (0, 7, -2);
glVertex3i (5, 7, -2);
glVertex3i (5, 2, -2);
glEnd;
end DrawRects;
type int_ar is array (Integer range <>) of aliased GLuint;
procedure ProcessHits (hits : GLint; buffer : in int_ar) is
j : Integer := buffer'First;
begin
tio.Put_Line ("Hits = " & GLint'Image (hits));
if hits /= 0 then
for i in
Integer (buffer'First) ..
Integer (buffer'First + Integer (hits) - 1)
loop
tio.Put_Line (" number of names for hit = " &
GLuint'Image (buffer (j)));
j := j + 1;
tio.Put (" z1 is " & GLuint'Image (buffer (j)));
j := j + 1;
tio.Put ("; z2 is " & GLuint'Image (buffer (j)));
j := j + 1;
tio.New_Line;
tio.Put (" names:");
for k in 1 .. Integer (buffer (buffer'First)) loop
tio.Put (" " & GLuint'Image (buffer (j)));
j := j + 1;
end loop;
tio.New_Line;
end loop;
end if;
end ProcessHits;
BUFSIZE : constant := 512;
procedure PickRects (btn : Integer; state: Integer; x, y: Integer) is
selectBuf : array (1 .. BUFSIZE) of aliased GLuint;
hits : GLint;
viewport : array (0 .. 3) of aliased GLint;
begin
if state = GLUT_LEFT_BUTTON then
if state = GLUT_DOWN then
glGetIntegerv (GL_VIEWPORT, viewport (0)'Access);
glSelectBuffer (BUFSIZE, selectBuf (1)'Access);
hits := glRenderMode (GL_SELECT);
glInitNames;
glPushName (-1);
glMatrixMode (GL_PROJECTION);
glPushMatrix;
glLoadIdentity;
gluPickMatrix (GLdouble (x), GLdouble (viewport (3) - GLint(y)),
5.0, 5.0, viewport (0)'Access);
glOrtho (0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
DrawRects (GL_SELECT);
glPopMatrix;
glFlush;
hits := glRenderMode (GL_RENDER);
ProcessHits (hits, int_ar (selectBuf));
end if;
end if;
end PickRects;
procedure DoDisplay is
begin
glClear (GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
DrawRects (GL_RENDER);
glFlush;
end DoDisplay;
procedure ReshapeCallback (w : Integer; h : Integer) is
begin
glViewport (0, 0, GLsizei(w), GLsizei(h));
glMatrixMode (GL_PROJECTION);
glLoadIdentity;
glOrtho (0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity;
end ReshapeCallback;
end PickDepth_Procs;
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