OpenGLUT 0.6.3 development - OpenGLUT: aapoly.c File Reference
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# aapoly.c File Reference

## Detailed Description

This program draws filled polygons with antialiased edges.

The special GL_SRC_ALPHA_SATURATE blending function is used.

Pressing the 't' key turns the antialiasing on and off.

    /*
     * 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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

    #include <GL/openglut.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>

    GLboolean polySmooth = GL_TRUE;

    static void init(void)
    {
       glCullFace (GL_BACK);
       glEnable (GL_CULL_FACE);
       glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
       glClearColor (0.0, 0.0, 0.0, 0.0);
    }

    #define NFACE 6
    #define NVERT 8
    void drawCube(GLdouble x0, GLdouble x1, GLdouble y0, GLdouble y1,
            GLdouble z0, GLdouble z1)
    {
       static GLfloat v[8][3];
       static GLfloat c[8][4] = {
          {0.0, 0.0, 0.0, 1.0}, {1.0, 0.0, 0.0, 1.0},
          {0.0, 1.0, 0.0, 1.0}, {1.0, 1.0, 0.0, 1.0},
          {0.0, 0.0, 1.0, 1.0}, {1.0, 0.0, 1.0, 1.0},
          {0.0, 1.0, 1.0, 1.0}, {1.0, 1.0, 1.0, 1.0}
       };

    /*  indices of front, top, left, bottom, right, back faces  */
       static GLubyte indices[NFACE][4] = {
          {4, 5, 6, 7}, {2, 3, 7, 6}, {0, 4, 7, 3},
          {0, 1, 5, 4}, {1, 5, 6, 2}, {0, 3, 2, 1}
       };

       v[0][0] = v[3][0] = v[4][0] = v[7][0] = x0;
       v[1][0] = v[2][0] = v[5][0] = v[6][0] = x1;
       v[0][1] = v[1][1] = v[4][1] = v[5][1] = y0;
       v[2][1] = v[3][1] = v[6][1] = v[7][1] = y1;
       v[0][2] = v[1][2] = v[2][2] = v[3][2] = z0;
       v[4][2] = v[5][2] = v[6][2] = v[7][2] = z1;

    #ifdef GL_VERSION_1_1
       glEnableClientState (GL_VERTEX_ARRAY);
       glEnableClientState (GL_COLOR_ARRAY);
       glVertexPointer (3, GL_FLOAT, 0, v);
       glColorPointer (4, GL_FLOAT, 0, c);
       glDrawElements (GL_QUADS, NFACE*4, GL_UNSIGNED_BYTE, indices);
       glDisableClientState (GL_VERTEX_ARRAY);
       glDisableClientState (GL_COLOR_ARRAY);
    #else
       printf ("If this is GL Version 1.0, ");
       printf ("vertex arrays are not supported.\n");
       exit(1);
    #endif
    }

    /*  Note:  polygons must be drawn from front to back
     *  for proper blending.
     */
    void display(void)
    {
       if (polySmooth) {
          glClear (GL_COLOR_BUFFER_BIT);
          glEnable (GL_BLEND);
          glEnable (GL_POLYGON_SMOOTH);
          glDisable (GL_DEPTH_TEST);
       }
       else {
          glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
          glDisable (GL_BLEND);
          glDisable (GL_POLYGON_SMOOTH);
          glEnable (GL_DEPTH_TEST);
       }

       glPushMatrix ();
          glTranslatef (0.0, 0.0, -8.0);
          glRotatef (30.0, 1.0, 0.0, 0.0);
          glRotatef (60.0, 0.0, 1.0, 0.0);
          drawCube(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5);
       glPopMatrix ();

       glFlush ();
    }

    void reshape(int w, int h)
    {
       glViewport(0, 0, (GLsizei) w, (GLsizei) h);
       glMatrixMode(GL_PROJECTION);
       glLoadIdentity();
       gluPerspective(30.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
       glMatrixMode(GL_MODELVIEW);
       glLoadIdentity();
    }

    /* ARGSUSED1 */
    void keyboard(unsigned char key, int x, int y)
    {
       switch (key) {
          case 't':
          case 'T':
             polySmooth = !polySmooth;
             glutPostRedisplay();
             break;
          case 27:
             exit(0);  /*  Escape key  */
             break;
          default:
             break;
       }
    }

    /*  Main Loop
     */
    int main(int argc, char** argv)
    {
       glutInit(&argc, argv);
       glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB
                            | GLUT_ALPHA | GLUT_DEPTH);
       glutInitWindowSize(200, 200);
       glutCreateWindow(argv[0]);
       init ();
       glutReshapeFunc (reshape);
       glutKeyboardFunc (keyboard);
       glutDisplayFunc (display);
       glutMainLoop();
       return 0;
    }

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