progs/trivial/tri-unfilled-tri.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     glClearColor(0.0, 0.0, 1.0, 0.0);
  45 }
  46
  47 static void Reshape(int width, int height)
  48 {
  49
  50     glViewport(0, 0, (GLint)width, (GLint)height);
  51
  52     glMatrixMode(GL_PROJECTION);
  53     glLoadIdentity();
  54 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  55     glMatrixMode(GL_MODELVIEW);
  56 }
  57
  58 static void Key(unsigned char key, int x, int y)
  59 {
  60
  61     switch (key) {
  62       case 27:
  63         exit(1);
  64       default:
  65         break;
  66     }
  67
  68     glutPostRedisplay();
  69 }
  70
  71 static void Draw(void)
  72 {
  73    glClear(GL_COLOR_BUFFER_BIT);
  74
  75    glPolygonMode(GL_FRONT, GL_LINE);
  76    glPolygonMode(GL_BACK, GL_LINE);
  77
  78    glBegin(GL_TRIANGLES);
  79    glColor3f(0,0,.7);
  80    glVertex3f( 0.9, -0.9, -0.0);
  81    glColor3f(.8,0,0);
  82    glVertex3f( 0.9,  0.9, -0.0);
  83    glColor3f(0,.9,0);
  84    glVertex3f(-0.9,  0.0, -0.0);
  85    glEnd();
  86
  87    glPolygonMode(GL_FRONT, GL_FILL);
  88    glPolygonMode(GL_BACK, GL_FILL);
  89
  90    glBegin(GL_TRIANGLES);
  91    glColor3f(0,0,.7);
  92    glVertex3f( 0.8, -0.8, -0.0);
  93    glColor3f(.8,0,0);
  94    glVertex3f( 0.8,  0.8, -0.0);
  95    glColor3f(0,.9,0);
  96    glVertex3f(-0.8,  0.0, -0.0);
  97    glEnd();
  98
  99    glPolygonMode(GL_FRONT, GL_LINE);
 100    glPolygonMode(GL_BACK, GL_LINE);
 101
 102    glBegin(GL_TRIANGLES);
 103    glColor3f(.8,0,0);
 104    glVertex3f( -0.9,  0.9, -0.0);
 105    glColor3f(0,0,.7);
 106    glVertex3f( -0.9, -0.9, -0.0);
 107    glColor3f(0,.9,0);
 108    glVertex3f( 0.9,  0.0, -0.0);
 109    glEnd();
 110
 111    glPolygonMode(GL_FRONT, GL_FILL);
 112    glPolygonMode(GL_BACK, GL_FILL);
 113
 114    glBegin(GL_TRIANGLES);
 115    glColor3f(.8,0,0);
 116    glVertex3f( -0.8,  0.8, -0.0);
 117    glColor3f(0,0,.7);
 118    glVertex3f( -0.8, -0.8, -0.0);
 119    glColor3f(0,.9,0);
 120    glVertex3f( 0.8,  0.0, -0.0);
 121    glEnd();
 122
 123    glFlush();
 124
 125    if (doubleBuffer) {
 126       glutSwapBuffers();
 127    }
 128 }
 129
 130 static GLenum Args(int argc, char **argv)
 131 {
 132     GLint i;
 133
 134     doubleBuffer = GL_FALSE;
 135
 136     for (i = 1; i < argc; i++) {
 137         if (strcmp(argv[i], "-sb") == 0) {
 138             doubleBuffer = GL_FALSE;
 139         } else if (strcmp(argv[i], "-db") == 0) {
 140             doubleBuffer = GL_TRUE;
 141         } else {
 142             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 143             return GL_FALSE;
 144         }
 145     }
 146     return GL_TRUE;
 147 }
 148
 149 int main(int argc, char **argv)
 150 {
 151     GLenum type;
 152
 153     glutInit(&argc, argv);
 154
 155     if (Args(argc, argv) == GL_FALSE) {
 156         exit(1);
 157     }
 158
 159     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 160
 161     type = GLUT_RGB | GLUT_ALPHA;
 162     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 163     glutInitDisplayMode(type);
 164
 165     if (glutCreateWindow(*argv) == GL_FALSE) {
 166         exit(1);
 167     }
 168
 169     Init();
 170
 171     glutReshapeFunc(Reshape);
 172     glutKeyboardFunc(Key);
 173     glutDisplayFunc(Draw);
 174     glutMainLoop();
 175         return 0;
 176 }