1 files changed, 175 insertions, 0 deletions
diff --git a/progs/redbook/alpha3D.c b/progs/redbook/alpha3D.c
new file mode 100644
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+++ b/progs/redbook/alpha3D.c
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+/*
+ * Copyright (c) 1993-1997, 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+ * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ *  alpha3D.c
+ *  This program demonstrates how to intermix opaque and
+ *  alpha blended polygons in the same scene, by using 
+ *  glDepthMask.  Press the 'a' key to animate moving the 
+ *  transparent object through the opaque object.  Press 
+ *  the 'r' key to reset the scene.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <GL/glut.h>
+
+#define MAXZ 8.0
+#define MINZ -8.0
+#define ZINC 0.4
+
+static float solidZ = MAXZ;
+static float transparentZ = MINZ;
+static GLuint sphereList, cubeList;
+
+static void init(void)
+{
+   GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 0.15 };
+   GLfloat mat_shininess[] = { 100.0 };
+   GLfloat position[] = { 0.5, 0.5, 1.0, 0.0 };
+
+   glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
+   glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
+   glLightfv(GL_LIGHT0, GL_POSITION, position);
+
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glEnable(GL_DEPTH_TEST);
+
+   sphereList = glGenLists(1);
+   glNewList(sphereList, GL_COMPILE);
+      glutSolidSphere (0.4, 16, 16);
+   glEndList();
+
+   cubeList = glGenLists(1);
+   glNewList(cubeList, GL_COMPILE);
+      glutSolidCube (0.6);
+   glEndList();
+}
+
+void display(void)
+{
+   GLfloat mat_solid[] = { 0.75, 0.75, 0.0, 1.0 };
+   GLfloat mat_zero[] = { 0.0, 0.0, 0.0, 1.0 };
+   GLfloat mat_transparent[] = { 0.0, 0.8, 0.8, 0.6 };
+   GLfloat mat_emission[] = { 0.0, 0.3, 0.3, 0.6 };
+
+   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glPushMatrix ();
+      glTranslatef (-0.15, -0.15, solidZ);
+      glMaterialfv(GL_FRONT, GL_EMISSION, mat_zero);
+      glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_solid);
+      glCallList (sphereList);
+   glPopMatrix ();
+
+   glPushMatrix ();
+      glTranslatef (0.15, 0.15, transparentZ);
+      glRotatef (15.0, 1.0, 1.0, 0.0);
+      glRotatef (30.0, 0.0, 1.0, 0.0);
+      glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission);
+      glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_transparent);
+      glEnable (GL_BLEND);
+      glDepthMask (GL_FALSE);
+      glBlendFunc (GL_SRC_ALPHA, GL_ONE);
+      glCallList (cubeList);
+      glDepthMask (GL_TRUE);
+      glDisable (GL_BLEND);
+   glPopMatrix ();
+
+   glutSwapBuffers();
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLint) w, (GLint) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   if (w <= h)
+      glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,
+               1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
+   else
+      glOrtho (-1.5*(GLfloat)w/(GLfloat)h,
+               1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+void animate(void)
+{
+   if (solidZ <= MINZ || transparentZ >= MAXZ)
+      glutIdleFunc(NULL);
+   else {
+      solidZ -= ZINC;
+      transparentZ += ZINC;
+      glutPostRedisplay();
+   }
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 'a':
+      case 'A':
+         solidZ = MAXZ;
+         transparentZ = MINZ;
+         glutIdleFunc(animate);
+         break;
+      case 'r':
+      case 'R':
+         solidZ = MAXZ;
+         transparentZ = MINZ;
+         glutPostRedisplay();
+         break;
+      case 27:
+        exit(0);
+    }
+}
+
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
+   glutInitWindowSize(500, 500);
+   glutCreateWindow(argv[0]);
+   init();
+   glutReshapeFunc(reshape);
+   glutKeyboardFunc(keyboard);
+   glutDisplayFunc(display);
+   glutMainLoop();
+   return 0;
+}