140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/*
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* alpha3D.c
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* This program demonstrates how to intermix opaque and
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* alpha blended polygons in the same scene, by using glDepthMask.
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* Pressing the left mouse button toggles the eye position.
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*/
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#include "pch.c"
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#pragma hdrstop
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static void myinit(void)
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{
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GLfloat mat_ambient[] = { 0.0, 0.0, 0.0, 0.15 };
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GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 0.15 };
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GLfloat mat_shininess[] = { 15.0 };
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glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
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glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
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glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
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glEnable (GL_LIGHTING);
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glEnable (GL_LIGHT0);
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glDepthFunc(GL_LESS);
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glEnable(GL_DEPTH_TEST);
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}
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static GLboolean eyePosition = GL_FALSE;
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static void toggleEye (AUX_EVENTREC *event)
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{
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if (eyePosition)
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eyePosition = GL_FALSE;
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else
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eyePosition = GL_TRUE;
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}
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static void display(void)
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{
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GLfloat position[] = { 0.0, 0.0, 1.0, 1.0 };
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GLfloat mat_torus[] = { 0.75, 0.75, 0.0, 1.0 };
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GLfloat mat_cylinder[] = { 0.0, 0.75, 0.75, 0.15 };
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glLightfv (GL_LIGHT0, GL_POSITION, position);
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glPushMatrix ();
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if (eyePosition)
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gluLookAt (0.0, 0.0, 9.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
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else
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gluLookAt (0.0, 0.0, -9.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
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glPushMatrix ();
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glTranslatef (0.0, 0.0, 1.0);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_torus);
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auxSolidTorus (0.275, 0.85);
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glPopMatrix ();
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glEnable (GL_BLEND);
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glDepthMask (GL_FALSE);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_cylinder);
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glTranslatef (0.0, 0.0, -1.0);
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auxSolidCylinder (1.0, 2.0);
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glDepthMask (GL_TRUE);
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glDisable (GL_BLEND);
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glPopMatrix ();
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glFlush ();
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}
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static void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(30.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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static void OglBounds(int *w, int *h)
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{
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*w = 500;
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*h = 500;
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}
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static void OglInit(HDC hdc)
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{
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SetHdcPixelFormat(hdc, 8, 0, 16, 0);
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}
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static void OglDraw(int w, int h)
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{
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myinit();
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myReshape(w, h);
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display();
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}
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OglModule oglmod_alpha3d =
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{
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"alpha3d",
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NULL,
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OglBounds,
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OglInit,
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OglDraw
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};
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