#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>

#define WINDSIZEX 100
#define WINDSIZEY 100

void
init (void)
{
    int i;
    GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };
    GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 };
    GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 };
    GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 };
    GLfloat blue[] = { 0.0, 0.0, 1.0, 1.0 };

    glClearColor (0.0, 0.0, 0.0, 1.0);
    glColor4fv (white);
    gluOrtho2D (0, WINDSIZEX, 0, WINDSIZEY);
    glDisable (GL_DITHER);
}


#define TEXSIZE 8
static void
test (void)
{
    int i, j;
    GLuint pb_unpack[1];
    GLubyte * pboUnpackMem = NULL;

    glGenBuffersARB(1, pb_unpack);
    glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, pb_unpack[0]);
    glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_EXT, TEXSIZE * TEXSIZE, NULL,
                    GL_STREAM_DRAW);
    pboUnpackMem = (GLubyte *) glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT,
                                       GL_WRITE_ONLY);


//  glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT);
    glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
    glDeleteBuffersARB(1, pb_unpack);
}

void
display (void)
{
    glViewport (0, 0, WINDSIZEX, WINDSIZEY);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    gluOrtho2D (0, WINDSIZEX, 0, WINDSIZEY);
    glMatrixMode (GL_MODELVIEW);
    glLoadIdentity ();

    test ();
}

int
main (int argc, char **argv)
{
    glutInit (&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize (WINDSIZEX, WINDSIZEY);
    glutInitWindowPosition (100, 100);
    glutCreateWindow (argv[0]);
    init ();
    glutDisplayFunc (display);
    glutMainLoop ();
    return 0;
}