| /* |
| * 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| * Unpublished-- rights reserved under the copyright laws of the |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. |
| */ |
| |
| /* |
| * aapoly.c |
| * 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. |
| */ |
| #include <GL/glut.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; |
| } |
| |