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 <GL/glew.h>
26
27#include <stdio.h>
28#include <string.h>
29#include <stdlib.h>
30#include "glut_wrap.h"
31
32
33#define CI_OFFSET_1 16
34#define CI_OFFSET_2 32
35
36GLenum doubleBuffer;
37
38static GLuint DrawPBO;
39
40static void Init(void)
41{
42   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
43   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
44   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
45   fflush(stderr);
46
47   glClearColor(0.0, 0.0, 1.0, 0.0);
48
49#define SIZE 16
50   {
51      GLubyte tex2d[SIZE][SIZE][4];
52      GLint s, t;
53
54      for (s = 0; s < SIZE; s++) {
55	 for (t = 0; t < SIZE; t++) {
56	    /* bgra:
57	     */
58	    tex2d[t][s][0] = 0x30;
59	    tex2d[t][s][1] = t*255/(SIZE-1);
60	    tex2d[t][s][2] = s*255/(SIZE-1);
61	    tex2d[t][s][3] = 0xff;
62	 }
63      }
64
65
66      /* put image into DrawPBO */
67      glGenBuffersARB(1, &DrawPBO);
68      glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, DrawPBO);
69      glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT,
70		      SIZE * SIZE * 4, tex2d, GL_STATIC_DRAW);
71      glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, 0);
72
73
74      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
75      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
76      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
77      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
78
79      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
80      glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
81      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SIZE, SIZE, 0,
82		   GL_BGRA, GL_UNSIGNED_BYTE, NULL);
83      glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
84      glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
85      glEnable(GL_TEXTURE_2D);
86   }
87
88}
89
90static void Reshape(int width, int height)
91{
92
93    glViewport(0, 0, (GLint)width, (GLint)height);
94
95    glMatrixMode(GL_PROJECTION);
96    glLoadIdentity();
97    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
98    glMatrixMode(GL_MODELVIEW);
99}
100
101static void Key(unsigned char key, int x, int y)
102{
103
104    switch (key) {
105      case 27:
106	exit(1);
107      default:
108	break;
109    }
110
111    glutPostRedisplay();
112}
113
114static void Draw(void)
115{
116   glClear(GL_COLOR_BUFFER_BIT);
117
118   glBegin(GL_QUADS);
119   glTexCoord2f(1,0);
120   glVertex3f( 0.9, -0.9, -30.0);
121   glTexCoord2f(1,1);
122   glVertex3f( 0.9,  0.9, -30.0);
123   glTexCoord2f(0,1);
124   glVertex3f(-0.9,  0.9, -30.0);
125   glTexCoord2f(0,0);
126   glVertex3f(-0.9,  -0.9, -30.0);
127   glEnd();
128
129   glFlush();
130
131   if (doubleBuffer) {
132      glutSwapBuffers();
133   }
134}
135
136static GLenum Args(int argc, char **argv)
137{
138    GLint i;
139
140    doubleBuffer = GL_FALSE;
141
142    for (i = 1; i < argc; i++) {
143        if (strcmp(argv[i], "-sb") == 0) {
144	    doubleBuffer = GL_FALSE;
145	} else if (strcmp(argv[i], "-db") == 0) {
146	    doubleBuffer = GL_TRUE;
147	} else {
148	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
149	    return GL_FALSE;
150	}
151    }
152    return GL_TRUE;
153}
154
155int main(int argc, char **argv)
156{
157    GLenum type;
158
159    glutInit(&argc, argv);
160
161    if (Args(argc, argv) == GL_FALSE) {
162	exit(1);
163    }
164
165    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
166
167    type = GLUT_RGB;
168    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
169    glutInitDisplayMode(type);
170
171    if (glutCreateWindow(*argv) == GL_FALSE) {
172	exit(1);
173    }
174
175    glewInit();
176
177    Init();
178
179    glutReshapeFunc(Reshape);
180    glutKeyboardFunc(Key);
181    glutDisplayFunc(Draw);
182    glutMainLoop();
183	return 0;
184}
185