progs/trivial/tri-lit-material.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <GL/glut.h>
  29
  30
  31 #define CI_OFFSET_1 16
  32 #define CI_OFFSET_2 32
  33
  34
  35 GLenum doubleBuffer;
  36
  37 static void Init(void)
  38 {
  39    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  40    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  41    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  42    fflush(stderr);
  43
  44   glEnable(GL_LIGHTING);
  45   glEnable(GL_LIGHT0);
  46
  47     glClearColor(0.0, 0.0, 1.0, 0.0);
  48 }
  49
  50 static void Reshape(int width, int height)
  51 {
  52
  53     glViewport(0, 0, (GLint)width, (GLint)height);
  54
  55     glMatrixMode(GL_PROJECTION);
  56     glLoadIdentity();
  57 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  58     glMatrixMode(GL_MODELVIEW);
  59 }
  60
  61 static void Key(unsigned char key, int x, int y)
  62 {
  63
  64     switch (key) {
  65       case 27:
  66         exit(1);
  67       default:
  68         break;
  69     }
  70
  71     glutPostRedisplay();
  72 }
  73
  74 static void Draw(void)
  75 {
  76    static GLfloat red[4] = {0.8, 0.1, 0.0, 1.0};
  77    static GLfloat green[4] = {0.0, 0.8, 0.2, 1.0};
  78    static GLfloat blue[4] = {0.2, 0.2, .9, 1.0};
  79
  80    glClear(GL_COLOR_BUFFER_BIT);
  81
  82    glBegin(GL_TRIANGLES);
  83    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
  84    glNormal3f(0,0,.7);
  85    glVertex3f( 0.9, -0.9, -0.0);
  86
  87    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
  88    glNormal3f(0,0,.8);
  89    glVertex3f( 0.9,  0.9, -0.0);
  90
  91    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
  92    glNormal3f(0,0,.9);
  93    glVertex3f(-0.9,  0.0, -0.0);
  94    glEnd();
  95
  96    glFlush();
  97
  98    if (doubleBuffer) {
  99       glutSwapBuffers();
 100    }
 101 }
 102
 103 static GLenum Args(int argc, char **argv)
 104 {
 105     GLint i;
 106
 107     doubleBuffer = GL_FALSE;
 108
 109     for (i = 1; i < argc; i++) {
 110         if (strcmp(argv[i], "-sb") == 0) {
 111             doubleBuffer = GL_FALSE;
 112         } else if (strcmp(argv[i], "-db") == 0) {
 113             doubleBuffer = GL_TRUE;
 114         } else {
 115             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 116             return GL_FALSE;
 117         }
 118     }
 119     return GL_TRUE;
 120 }
 121
 122 int main(int argc, char **argv)
 123 {
 124     GLenum type;
 125
 126     glutInit(&argc, argv);
 127
 128     if (Args(argc, argv) == GL_FALSE) {
 129         exit(1);
 130     }
 131
 132     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 133
 134     type = GLUT_RGB | GLUT_ALPHA;
 135     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 136     glutInitDisplayMode(type);
 137
 138     if (glutCreateWindow(*argv) == GL_FALSE) {
 139         exit(1);
 140     }
 141
 142     Init();
 143
 144     glutReshapeFunc(Reshape);
 145     glutKeyboardFunc(Key);
 146     glutDisplayFunc(Draw);
 147     glutMainLoop();
 148         return 0;
 149 }