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
31
32
33GLenum doubleBuffer;
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
42   glClearColor(0.0, 0.0, 1.0, 1.0);
43
44
45#define SIZE 32
46   {
47      GLubyte tex2d[SIZE][SIZE][3];
48      GLint s, t;
49
50      for (s = 0; s < SIZE; s++) {
51	 for (t = 0; t < SIZE; t++) {
52#if 0
53	    tex2d[t][s][0] = (s < SIZE/2) ? 0 : 255;
54	    tex2d[t][s][1] = (t < SIZE/2) ? 0 : 255;
55	    tex2d[t][s][2] = 0;
56#else
57	    tex2d[t][s][0] = s*255/(SIZE-1);
58	    tex2d[t][s][1] = t*255/(SIZE-1);
59	    tex2d[t][s][2] = 0;
60#endif
61	 }
62      }
63
64      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
65
66      glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
67                   GL_RGB, GL_UNSIGNED_BYTE, tex2d);
68
69      glEnable(GL_TEXTURE_2D);
70      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
71      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
72      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
73      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
74
75      glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
76   }
77
78}
79
80static void Reshape(int width, int height)
81{
82
83    glViewport(0, 0, (GLint)width, (GLint)height);
84
85    glMatrixMode(GL_PROJECTION);
86    glLoadIdentity();
87/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
88    glMatrixMode(GL_MODELVIEW);
89}
90
91static void Key(unsigned char key, int x, int y)
92{
93
94    switch (key) {
95      case 27:
96	exit(1);
97      default:
98	break;
99    }
100
101    glutPostRedisplay();
102}
103
104static void Draw(void)
105{
106   glClear(GL_COLOR_BUFFER_BIT);
107
108   glBegin(GL_TRIANGLES);
109   glTexCoord2f(1,-1);
110   glVertex3f( 0.9, -0.9, -0.0);
111   glTexCoord2f(1,1);
112   glVertex3f( 0.9,  0.9, -0.0);
113   glTexCoord2f(-1,0);
114   glVertex3f(-0.9,  0.0, -0.0);
115   glEnd();
116
117   glFlush();
118
119   if (doubleBuffer) {
120      glutSwapBuffers();
121   }
122}
123
124static GLenum Args(int argc, char **argv)
125{
126    GLint i;
127
128    doubleBuffer = GL_FALSE;
129
130    for (i = 1; i < argc; i++) {
131        if (strcmp(argv[i], "-sb") == 0) {
132	    doubleBuffer = GL_FALSE;
133	} else if (strcmp(argv[i], "-db") == 0) {
134	    doubleBuffer = GL_TRUE;
135	} else {
136	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
137	    return GL_FALSE;
138	}
139    }
140    return GL_TRUE;
141}
142
143int main(int argc, char **argv)
144{
145    GLenum type;
146
147    glutInit(&argc, argv);
148
149    if (Args(argc, argv) == GL_FALSE) {
150	exit(1);
151    }
152
153    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
154
155    type = GLUT_RGB | GLUT_ALPHA;
156    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
157    glutInitDisplayMode(type);
158
159    if (glutCreateWindow(*argv) == GL_FALSE) {
160	exit(1);
161    }
162
163    Init();
164
165    glutReshapeFunc(Reshape);
166    glutKeyboardFunc(Key);
167    glutDisplayFunc(Draw);
168    glutMainLoop();
169	return 0;
170}
171