/*
 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the name of
 * Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
 * ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <math.h>
#include <GL/gltk.h>

#define INREAL float

#define S_NUMPOINTS 13
#define S_ORDER     3
#define S_NUMKNOTS  (S_NUMPOINTS + S_ORDER)
#define T_NUMPOINTS 3
#define T_ORDER     3
#define T_NUMKNOTS  (T_NUMPOINTS + T_ORDER)
#define SQRT_TWO    1.41421356237309504880

typedef INREAL Point[4];

GLenum doubleBuffer, directRender;

GLenum expectedError;
GLint rotX = 40, rotY = 40;
INREAL sknots[S_NUMKNOTS] =
{
  -1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0,
  4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 9.0, 9.0
};
INREAL tknots[T_NUMKNOTS] =
{
  1.0, 1.0, 1.0, 2.0, 2.0, 2.0
};
Point ctlpoints[S_NUMPOINTS][T_NUMPOINTS] =
{
  {
    {
      4.0, 2.0, 2.0, 1.0
    },
    {
      4.0, 1.6, 2.5, 1.0
    },
    {
      4.0, 2.0, 3.0, 1.0
    }
  },
  {
    {
      5.0, 4.0, 2.0, 1.0
    },
    {
      5.0, 4.0, 2.5, 1.0
    },
    {
      5.0, 4.0, 3.0, 1.0
    }
  },
  {
    {
      6.0, 5.0, 2.0, 1.0
    },
    {
      6.0, 5.0, 2.5, 1.0
    },
    {
      6.0, 5.0, 3.0, 1.0
    }
  },
  {
    {
      SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
    },
    {
      SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
    },
    {
      SQRT_TWO * 6.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
    }
  },
  {
    {
      5.2, 6.7, 2.0, 1.0
    },
    {
      5.2, 6.7, 2.5, 1.0
    },
    {
      5.2, 6.7, 3.0, 1.0
    }
  },
  {
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
    },
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
    },
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
    }
  },
  {
    {
      4.0, 5.2, 2.0, 1.0
    },
    {
      4.0, 4.6, 2.5, 1.0
    },
    {
      4.0, 5.2, 3.0, 1.0
    }
  },
  {
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
    },
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
    },
    {
      SQRT_TWO * 4.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
    }
  },
  {
    {
      2.8, 6.7, 2.0, 1.0
    },
    {
      2.8, 6.7, 2.5, 1.0
    },
    {
      2.8, 6.7, 3.0, 1.0
    }
  },
  {
    {
      SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 2.0, SQRT_TWO
    },
    {
      SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 2.5, SQRT_TWO
    },
    {
      SQRT_TWO * 2.0, SQRT_TWO * 6.0, SQRT_TWO * 3.0, SQRT_TWO
    }
  },
  {
    {
      2.0, 5.0, 2.0, 1.0
    },
    {
      2.0, 5.0, 2.5, 1.0
    },
    {
      2.0, 5.0, 3.0, 1.0
    }
  },
  {
    {
      3.0, 4.0, 2.0, 1.0
    },
    {
      3.0, 4.0, 2.5, 1.0
    },
    {
      3.0, 4.0, 3.0, 1.0
    }
  },
  {
    {
      4.0, 2.0, 2.0, 1.0
    },
    {
      4.0, 1.6, 2.5, 1.0
    },
    {
      4.0, 2.0, 3.0, 1.0
    }
  }
};
GLUnurbsObj *theNurbs;

static void ErrorCallback(GLenum which)
{

  if (which != expectedError) {
    fprintf(stderr, "Unexpected error occured (%d):\n", which);
    fprintf(stderr, "    %s\n", gluErrorString(which));
  }
}

static void Init(void)
{

  theNurbs = gluNewNurbsRenderer();
  gluNurbsCallback(theNurbs, GLU_ERROR, ErrorCallback);

  gluNurbsProperty(theNurbs, GLU_SAMPLING_TOLERANCE, 15.0);
  gluNurbsProperty(theNurbs, GLU_DISPLAY_MODE, GLU_OUTLINE_PATCH);

  expectedError = GLU_INVALID_ENUM;
  gluNurbsProperty(theNurbs, ~0, 15.0);
  expectedError = GLU_NURBS_ERROR13;
  gluEndSurface(theNurbs);
  expectedError = 0;

  glColor3f(1.0, 1.0, 1.0);
}

static void Reshape(int width, int height)
{

  glViewport(0, 0, (GLint) width, (GLint) height);

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glFrustum(-2.0, 2.0, -2.0, 2.0, 0.8, 10.0);
  gluLookAt(7.0, 4.5, 4.0, 4.5, 4.5, 2.5, 6.0, -3.0, 2.0);
  glMatrixMode(GL_MODELVIEW);
}

static GLenum Key(int key, GLenum mask)
{

  switch (key) {
    case TK_ESCAPE:
      tkQuit();
    case TK_DOWN:
      rotX -= 5;
      break;
    case TK_UP:
      rotX += 5;
      break;
    case TK_LEFT:
      rotY -= 5;
      break;
    case TK_RIGHT:
      rotY += 5;
      break;
    default:
      return GL_FALSE;
  }
  return GL_TRUE;
}

static void Draw(void)
{

  glClear(GL_COLOR_BUFFER_BIT);

  glPushMatrix();

  glTranslatef(4.0, 4.5, 2.5);
  glRotatef(rotY, 1, 0, 0);
  glRotatef(rotX, 0, 1, 0);
  glTranslatef(-4.0, -4.5, -2.5);

  gluBeginSurface(theNurbs);
  gluNurbsSurface(theNurbs, S_NUMKNOTS, sknots, T_NUMKNOTS, tknots,
		  4 * T_NUMPOINTS, 4, &ctlpoints[0][0][0], S_ORDER,
		  T_ORDER, GL_MAP2_VERTEX_4);
  gluEndSurface(theNurbs);

  glPopMatrix();

  glFlush();

  if (doubleBuffer) {
    tkSwapBuffers();
  }
}

static GLenum Args(int argc, char **argv)
{
  GLint i;

  doubleBuffer = GL_FALSE;
  directRender = GL_TRUE;

  for (i = 1; i < argc; i++) {
    if (strcmp(argv[i], "-sb") == 0) {
      doubleBuffer = GL_FALSE;
    }
    else if (strcmp(argv[i], "-db") == 0) {
      doubleBuffer = GL_TRUE;
    }
    else if (strcmp(argv[i], "-dr") == 0) {
      directRender = GL_TRUE;
    }
    else if (strcmp(argv[i], "-ir") == 0) {
      directRender = GL_FALSE;
    }
    else {
      printf("%s (Bad option).\n", argv[i]);
      return GL_FALSE;
    }
  }
  return GL_TRUE;
}

void main(int argc, char **argv)
{
  GLenum type;

  if (Args(argc, argv) == GL_FALSE) {
    tkQuit();
  }

  tkInitPosition(0, 0, 300, 300);

  type = TK_RGB;
  type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
  type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
  tkInitDisplayMode(type);

  if (tkInitWindow("NURBS Test") == GL_FALSE) {
    tkQuit();
  }

  Init();

  tkExposeFunc(Reshape);
  tkReshapeFunc(Reshape);
  tkKeyDownFunc(Key);
  tkDisplayFunc(Draw);
  tkExec();
}