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/glew.h>
29#include "glut_wrap.h"
30
31static GLenum doubleBuffer;
32static GLenum frontface = GL_CCW;
33static GLboolean ProvokeFirst = 0;
34
35static void Init(void)
36{
37   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
38   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
39   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
40   fflush(stderr);
41   glShadeModel(GL_FLAT);
42}
43
44static void Reshape(int width, int height)
45{
46    glViewport(0, 0, (GLint)width, (GLint)height);
47
48    glMatrixMode(GL_PROJECTION);
49    glLoadIdentity();
50/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
51    glMatrixMode(GL_MODELVIEW);
52}
53
54static void Key(unsigned char key, int x, int y)
55{
56   switch (key) {
57   case 'f':
58      frontface = (frontface == GL_CCW) ? GL_CW : GL_CCW;
59      glFrontFace(frontface);
60      break;
61   case 'p':
62      ProvokeFirst = !ProvokeFirst;
63      printf("provoke first: %d\n", ProvokeFirst);
64      if (ProvokeFirst)
65         glProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT);
66      else
67         glProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
68      break;
69   case 27:
70      exit(1);
71   default:
72      return;
73   }
74
75    glutPostRedisplay();
76}
77
78static void Draw(void)
79{
80   glClear(GL_COLOR_BUFFER_BIT);
81   glPolygonMode(GL_FRONT, GL_LINE);
82   glPolygonMode(GL_BACK, GL_POINT);
83
84   glBegin(GL_TRIANGLES);
85   glEdgeFlag(1);
86   glColor3f(0.3,0.3,.9);
87   glVertex3f( 0.9, -0.9, -0.0);
88   glEdgeFlag(0);
89   glColor3f(.8,0,0);
90   glVertex3f( 0.9,  0.9, -0.0);
91   glEdgeFlag(1);
92   glColor3f(0,.9,0);
93   glVertex3f(-0.9,  0.0, -0.0);
94   glEnd();
95
96   glFlush();
97
98   if (doubleBuffer) {
99      glutSwapBuffers();
100   }
101}
102
103static 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
122int 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    glewInit();
143    Init();
144
145    glutReshapeFunc(Reshape);
146    glutKeyboardFunc(Key);
147    glutDisplayFunc(Draw);
148    glutMainLoop();
149    return 0;
150}
151