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

#define WINDSIZEX 100
#define WINDSIZEY 100

static GLfloat colorTable[][3] = {
  {
   0.0, 0.0, 0.0},
  {
   1.0, 0.0, 0.0},
  {
   0.0, 1.0, 0.0},
  {
   0.0, 0.0, 1.0},
  {
   1.0, 1.0, 1.0},
  {
   1.0, 1.0, 0.0},
  {
   1.0, 0.0, 1.0},
  {
   0.0, 1.0, 1.0}
};


#define TEXTURE_SIZE 64
void
MakeMipmap (void)
{
  GLfloat buf[TEXTURE_SIZE * TEXTURE_SIZE * 3];
  GLint i, j, level, size;
  GLfloat *ptr;

  level = 0;
  for (size = TEXTURE_SIZE; size > 0; size /= 2)
    {
      ptr = buf;
      for (i = 0; i < size; i++)
	for (j = 0; j < size; j++)
	  {
	    *ptr++ = colorTable[level + 1][0];
	    *ptr++ = colorTable[level + 1][1];
	    *ptr++ = colorTable[level + 1][2];
	  }
      glTexImage2D (GL_TEXTURE_2D, level, 3, size, size, 0, GL_RGB, GL_FLOAT,
		    buf);
      level++;
    }
}


void
init (void)
{
  int i;
  GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 };

  glClearColor (0.0, 0.0, 0.0, 1.0);
  glColor4fv (white);
  glDisable (GL_DITHER);
}


static void
test (void)
{
  int i, j;
  GLuint texName;
  GLfloat maxLodBias;


  glClear (GL_COLOR_BUFFER_BIT);

  glGenTextures (1, &texName);
  glBindTexture (GL_TEXTURE_1D, texName);
  MakeMipmap ();

  glBindTexture (GL_TEXTURE_1D, texName);

  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 5);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1000);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, 0);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, 1000);


  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
		   GL_NEAREST_MIPMAP_NEAREST);

  glEnable (GL_TEXTURE_2D);
  glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);


  glClear (GL_COLOR_BUFFER_BIT);
  glBegin (GL_POLYGON);
  glTexCoord2f (0.0, 0.0);
  glVertex2i (0, 0);
  glTexCoord2f (0.0, 1.0);
  glVertex2i (0, TEXTURE_SIZE);
  glTexCoord2f (1.0, 1.0);
  glVertex2i (TEXTURE_SIZE, TEXTURE_SIZE);
  glTexCoord2f (1.0, 0.0);
  glVertex2i (TEXTURE_SIZE, 0);
  glEnd ();

  glFlush ();
}

void
display (void)
{
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();
  gluOrtho2D (0, WINDSIZEX, 0, WINDSIZEX);
  test ();
}

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