173 lines
5.3 KiB
C
173 lines
5.3 KiB
C
/*
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* Copyright (c) 1993-1997, 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(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* aapoly.c
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* This program draws filled polygons with antialiased
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* edges. The special GL_SRC_ALPHA_SATURATE blending
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* function is used.
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* Pressing the 't' key turns the antialiasing on and off.
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*/
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#include <GL/glut.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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GLboolean polySmooth = GL_TRUE;
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static void init(void)
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{
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glCullFace (GL_BACK);
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glEnable (GL_CULL_FACE);
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glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
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glClearColor (0.0, 0.0, 0.0, 0.0);
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}
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#define NFACE 6
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#define NVERT 8
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void drawCube(GLdouble x0, GLdouble x1, GLdouble y0, GLdouble y1,
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GLdouble z0, GLdouble z1)
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{
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static GLfloat v[8][3];
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static GLfloat c[8][4] = {
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{0.0, 0.0, 0.0, 1.0}, {1.0, 0.0, 0.0, 1.0},
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{0.0, 1.0, 0.0, 1.0}, {1.0, 1.0, 0.0, 1.0},
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{0.0, 0.0, 1.0, 1.0}, {1.0, 0.0, 1.0, 1.0},
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{0.0, 1.0, 1.0, 1.0}, {1.0, 1.0, 1.0, 1.0}
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};
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/* indices of front, top, left, bottom, right, back faces */
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static GLubyte indices[NFACE][4] = {
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{4, 5, 6, 7}, {2, 3, 7, 6}, {0, 4, 7, 3},
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{0, 1, 5, 4}, {1, 5, 6, 2}, {0, 3, 2, 1}
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};
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v[0][0] = v[3][0] = v[4][0] = v[7][0] = x0;
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v[1][0] = v[2][0] = v[5][0] = v[6][0] = x1;
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v[0][1] = v[1][1] = v[4][1] = v[5][1] = y0;
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v[2][1] = v[3][1] = v[6][1] = v[7][1] = y1;
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v[0][2] = v[1][2] = v[2][2] = v[3][2] = z0;
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v[4][2] = v[5][2] = v[6][2] = v[7][2] = z1;
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#ifdef GL_VERSION_1_1
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glEnableClientState (GL_VERTEX_ARRAY);
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glEnableClientState (GL_COLOR_ARRAY);
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glVertexPointer (3, GL_FLOAT, 0, v);
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glColorPointer (4, GL_FLOAT, 0, c);
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glDrawElements (GL_QUADS, NFACE*4, GL_UNSIGNED_BYTE, indices);
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glDisableClientState (GL_VERTEX_ARRAY);
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glDisableClientState (GL_COLOR_ARRAY);
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#else
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printf ("If this is GL Version 1.0, ");
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printf ("vertex arrays are not supported.\n");
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exit(1);
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#endif
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}
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/* Note: polygons must be drawn from front to back
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* for proper blending.
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*/
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void display(void)
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{
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if (polySmooth) {
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glClear (GL_COLOR_BUFFER_BIT);
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glEnable (GL_BLEND);
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glEnable (GL_POLYGON_SMOOTH);
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glDisable (GL_DEPTH_TEST);
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}
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else {
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glDisable (GL_BLEND);
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glDisable (GL_POLYGON_SMOOTH);
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glEnable (GL_DEPTH_TEST);
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}
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glPushMatrix ();
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glTranslatef (0.0, 0.0, -8.0);
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glRotatef (30.0, 1.0, 0.0, 0.0);
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glRotatef (60.0, 0.0, 1.0, 0.0);
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drawCube(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5);
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glPopMatrix ();
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glFlush ();
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}
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void reshape(int w, int h)
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{
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glViewport(0, 0, (GLsizei) w, (GLsizei) 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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/* ARGSUSED1 */
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 't':
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case 'T':
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polySmooth = !polySmooth;
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glutPostRedisplay();
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break;
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case 27:
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exit(0); /* Escape key */
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break;
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default:
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break;
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}
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}
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/* Main Loop
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*/
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int main(int argc, char** argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB
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| GLUT_ALPHA | GLUT_DEPTH);
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glutInitWindowSize(200, 200);
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glutCreateWindow(argv[0]);
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init ();
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glutReshapeFunc (reshape);
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glutKeyboardFunc (keyboard);
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glutDisplayFunc (display);
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glutMainLoop();
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return 0;
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}
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