/*
 * 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 <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <stdlib.h>
#include "gltk.h"

GLenum doubleBuffer, directRender;

char *texFileName = 0;
TK_RGBImageRec *image;

float *minFilter, *magFilter, *sWrapMode, *tWrapMode;
float decal[] =
{GL_DECAL};
float modulate[] =
{GL_MODULATE};
float repeat[] =
{GL_REPEAT};
float clamp[] =
{GL_CLAMP};
float nr[] =
{GL_NEAREST};
float ln[] =
{GL_LINEAR};
float nr_mipmap_nr[] =
{GL_NEAREST_MIPMAP_NEAREST};
float nr_mipmap_ln[] =
{GL_NEAREST_MIPMAP_LINEAR};
float ln_mipmap_nr[] =
{GL_LINEAR_MIPMAP_NEAREST};
float ln_mipmap_ln[] =
{GL_LINEAR_MIPMAP_LINEAR};
GLint sphereMap[] =
{GL_SPHERE_MAP};

GLenum doSphere = GL_FALSE;
float xRotation = 0.0, yRotation = 0.0, zTranslate = -3.125;

GLint cube;
float c[6][4][3] =
{
  {
    {
      1.0, 1.0, -1.0
    },
    {
      -1.0, 1.0, -1.0
    },
    {
      -1.0, -1.0, -1.0
    },
    {
      1.0, -1.0, -1.0
    }
  },
  {
    {
      1.0, 1.0, 1.0
    },
    {
      1.0, 1.0, -1.0
    },
    {
      1.0, -1.0, -1.0
    },
    {
      1.0, -1.0, 1.0
    }
  },
  {
    {
      -1.0, 1.0, 1.0
    },
    {
      1.0, 1.0, 1.0
    },
    {
      1.0, -1.0, 1.0
    },
    {
      -1.0, -1.0, 1.0
    }
  },
  {
    {
      -1.0, 1.0, -1.0
    },
    {
      -1.0, 1.0, 1.0
    },
    {
      -1.0, -1.0, 1.0
    },
    {
      -1.0, -1.0, -1.0
    }
  },
  {
    {
      -1.0, 1.0, 1.0
    },
    {
      -1.0, 1.0, -1.0
    },
    {
      1.0, 1.0, -1.0
    },
    {
      1.0, 1.0, 1.0
    }
  },
  {
    {
      -1.0, -1.0, -1.0
    },
    {
      -1.0, -1.0, 1.0
    },
    {
      1.0, -1.0, 1.0
    },
    {
      1.0, -1.0, -1.0
    }
  }
};
static float n[6][3] =
{
  {
    0.0, 0.0, -1.0
  },
  {
    1.0, 0.0, 0.0
  },
  {
    0.0, 0.0, 1.0
  },
  {
    -1.0, 0.0, 0.0
  },
  {
    0.0, 1.0, 0.0
  },
  {
    0.0, -1.0, 0.0
  }
};
static float t[6][4][2] =
{
  {
    {
      1.1, 1.1
    },
    {
      -0.1, 1.1
    },
    {
      -0.1, -0.1
    },
    {
      1.1, -0.1
    }
  },
  {
    {
      1.1, 1.1
    },
    {
      -0.1, 1.1
    },
    {
      -0.1, -0.1
    },
    {
      1.1, -0.1
    }
  },
  {
    {
      -0.1, 1.1
    },
    {
      1.1, 1.1
    },
    {
      1.1, -0.1
    },
    {
      -0.1, -0.1
    }
  },
  {
    {
      1.1, 1.1
    },
    {
      -0.1, 1.1
    },
    {
      -0.1, -0.1
    },
    {
      1.1, -0.1
    }
  },
  {
    {
      1.1, 1.1
    },
    {
      -0.1, 1.1
    },
    {
      -0.1, -0.1
    },
    {
      1.1, -0.1
    }
  },
  {
    {
      1.1, 1.1
    },
    {
      -0.1, 1.1
    },
    {
      -0.1, -0.1
    },
    {
      1.1, -0.1
    }
  },
};

static void BuildCube(void)
{
  GLint i;

  glNewList(cube, GL_COMPILE);
  for (i = 0; i < 6; i++) {
    glBegin(GL_POLYGON);
    glNormal3fv(n[i]);
    glTexCoord2fv(t[i][0]);
    glVertex3fv(c[i][0]);
    glNormal3fv(n[i]);
    glTexCoord2fv(t[i][1]);
    glVertex3fv(c[i][1]);
    glNormal3fv(n[i]);
    glTexCoord2fv(t[i][2]);
    glVertex3fv(c[i][2]);
    glNormal3fv(n[i]);
    glTexCoord2fv(t[i][3]);
    glVertex3fv(c[i][3]);
    glEnd();
  }
  glEndList();
}

static void BuildLists(void)
{

  cube = glGenLists(1);
  BuildCube();
}

static void Init(void)
{

  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image->sizeX, image->sizeY,
		    GL_RGB, GL_UNSIGNED_BYTE, image->data);
  glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal);
  glEnable(GL_TEXTURE_2D);

  glFrontFace(GL_CCW);
  glCullFace(GL_FRONT);
  glEnable(GL_CULL_FACE);

  BuildLists();

  glClearColor(0.0, 0.0, 0.0, 0.0);

  magFilter = nr;
  minFilter = nr;
  sWrapMode = repeat;
  tWrapMode = repeat;
}

static void Reshape(int width, int height)
{

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

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(145.0, 1.0, 0.01, 1000);
  glMatrixMode(GL_MODELVIEW);
}

static GLenum Key(int key, GLenum mask)
{

  switch (key) {
    case TK_ESCAPE:
      tkQuit();

    case TK_LEFT:
      yRotation -= 0.5;
      break;
    case TK_RIGHT:
      yRotation += 0.5;
      break;
    case TK_UP:
      xRotation -= 0.5;
      break;
    case TK_DOWN:
      xRotation += 0.5;
      break;
    case TK_T:
      zTranslate += 0.25;
      break;
    case TK_t:
      zTranslate -= 0.25;
      break;

    case TK_s:
      doSphere = !doSphere;
      if (doSphere) {
	glTexGeniv(GL_S, GL_TEXTURE_GEN_MODE, sphereMap);
	glTexGeniv(GL_T, GL_TEXTURE_GEN_MODE, sphereMap);
	glEnable(GL_TEXTURE_GEN_S);
	glEnable(GL_TEXTURE_GEN_T);
      }
      else {
	glDisable(GL_TEXTURE_GEN_S);
	glDisable(GL_TEXTURE_GEN_T);
      }
      break;

    case TK_0:
      magFilter = nr;
      break;
    case TK_1:
      magFilter = ln;
      break;
    case TK_2:
      minFilter = nr;
      break;
    case TK_3:
      minFilter = ln;
      break;
    case TK_4:
      minFilter = nr_mipmap_nr;
      break;
    case TK_5:
      minFilter = nr_mipmap_ln;
      break;
    case TK_6:
      minFilter = ln_mipmap_nr;
      break;
    case TK_7:
      minFilter = ln_mipmap_ln;
      break;

    default:
      return GL_FALSE;
  }
  return GL_TRUE;
}

static void Draw(void)
{

  glClear(GL_COLOR_BUFFER_BIT);

  glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sWrapMode);
  glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tWrapMode);
  glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter);
  glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);

  glPushMatrix();

  glTranslatef(0.0, 0.0, zTranslate);
  glRotatef(xRotation, 1, 0, 0);
  glRotatef(yRotation, 0, 1, 0);
  glCallList(cube);

  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 if (strcmp(argv[i], "-f") == 0) {
      if (i + 1 >= argc || argv[i + 1][0] == '-') {
	printf("-f (No file name).\n");
	return GL_FALSE;
      }
      else {
	texFileName = argv[++i];
      }
    }
    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();
  }

  if (texFileName == 0) {
    printf("No image file.\n");
    tkQuit();
  }

  image = tkRGBImageLoad(texFileName);

  tkInitPosition(0, 0, 300, 300);

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

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

  Init();

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