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

#include "bitmap.h"

// Define a constant for the value of PI
#define GL_PI 3.1415f

// Put here your own global variables and procedures
static int MenuID;

static float xRot = 0.0;
static float yRot = 0.0;

static int dMode = 0;

void StrokeText(char *string) {
  int len, i;
  len = (int) strlen (string);
  for (i = 0; i < len; i++) {
    glutStrokeCharacter (GLUT_STROKE_ROMAN, string[i]);
  }
}

// Called to draw scene
void RenderScene(void)
{
  int i;
  
  // Clear the window with current clearing color
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  glPushMatrix();
  
  glRotatef(xRot, 1.0f, 0.0f, 0.0f);
  glRotatef(yRot, 0.0f, 1.0f, 0.0f);
  
  glColor3f(0.7, 0.7, 0.7);
  
  if (dMode == 0) {
    
    //	FRONT
    
    glBegin(GL_QUADS);
    glTexCoord2f(0.0, 0.0);  glVertex3f(-20.0, -20.0, 0.01);
    glTexCoord2f(1.0, 0.0);  glVertex3f(20.0, -20.0, 0.01);
    glTexCoord2f(1.0, 1.0);  glVertex3f(20.0, 20.0, 0.01);
    glTexCoord2f(0.0, 1.0);  glVertex3f(-20.0, 20.0, 0.01);
    glEnd();
    
    //	BACK
    
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 0.0);  glVertex3f(-20.0, -20.0, -0.01);
    glTexCoord2f(0.0, 0.0);  glVertex3f(20.0, -20.0, -0.01);
    glTexCoord2f(0.0, 1.0);  glVertex3f(20.0, 20.0, -0.01);
    glTexCoord2f(1.0, 1.0);  glVertex3f(-20.0, 20.0, -0.01);
    glEnd();
    
  } else if (dMode == 1) {
    
    //	FRONT
    
    glBegin(GL_QUADS);
    glTexCoord2f(0.0, 0.0);  glVertex3f(-20.0, -20.0, 0.01);
    glTexCoord2f(1.0, 0.0);  glVertex3f(20.0, -20.0, 0.01);
    glTexCoord2f(1.0, 1.0);  glVertex3f(10.0, 10.0, 0.01);
    glTexCoord2f(0.0, 1.0);  glVertex3f(-10.0, 10.0, 0.01);
    glEnd();
    
    //	BACK
    
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 0.0);  glVertex3f(-20.0, -20.0, -0.01);
    glTexCoord2f(0.0, 0.0);  glVertex3f(20.0, -20.0, -0.01);
    glTexCoord2f(0.0, 1.0);  glVertex3f(10.0, 10.0, -0.01);
    glTexCoord2f(1.0, 1.0);  glVertex3f(-10.0, 10.0, -0.01);
    glEnd();
    
  } else if (dMode == 2) {
    
    //	FRONT
    
    glBegin(GL_POLYGON);
    for (i=0; i<50; i++) {
      glTexCoord2f(0.5-0.5*cos((GLfloat)i*GL_PI/25.0), 0.5-0.5*sin((GLfloat)i*GL_PI/25.0));
      glVertex3f(-20.0*cos((GLfloat)i*GL_PI/25.0), -20.0*sin((GLfloat)i*GL_PI/25.0), 0.01);
    }
    glEnd();
    
    //	BACK
    
    glBegin(GL_POLYGON);
    for (i=0; i<50; i++) {
      glTexCoord2f(0.5+0.5*cos((GLfloat)i*GL_PI/25.0), 0.5-0.5*sin((GLfloat)i*GL_PI/25.0));
      glVertex3f(-20.0*cos((GLfloat)i*GL_PI/25.0), -20.0*sin((GLfloat)i*GL_PI/25.0), -0.01);
    }
    glEnd();
    
  }
  
  glPopMatrix();
  
  // Flush drawing commands
  glutSwapBuffers();
}

// This function does any needed initialization on the rendering
// context. 
void SetupRC()
{
  BITMAPINFO *texInfo; 
  GLubyte    *texBits; 

  // Black background
  glClearColor(0.0f, 0.0f, 0.0f, 1.0f );
  glEnable(GL_DEPTH_TEST);
  
  texBits = LoadDIBitmap("DONOTENT.bmp", &texInfo);
  
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
  
  glTexImage2D(GL_TEXTURE_2D, 0, 3, texInfo->bmiHeader.biWidth, texInfo->bmiHeader.biHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, texBits);
  glEnable(GL_TEXTURE_2D);
  
  glEnable(GL_DEPTH_TEST);
  
  glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
}

void SpecialKeys(int key, int x, int y)
{

	if(key == GLUT_KEY_UP)
		xRot-= 5.0f;

	if(key == GLUT_KEY_DOWN)
		xRot += 5.0f;

	if(key == GLUT_KEY_LEFT)
		yRot -= 5.0f;

	if(key == GLUT_KEY_RIGHT)
		yRot += 5.0f;

	if(key > 356.0f)
		xRot = 0.0f;

	if(key < -1.0f)
		xRot = 355.0f;

	if(key > 356.0f)
		yRot = 0.0f;

	if(key < -1.0f)
		yRot = 355.0f;

  // Refresh the Window
  glutPostRedisplay();
}

void Keyboard(unsigned char key, int x, int y)
{

  // ...

  glutPostRedisplay();
}

void Timer(int value)
{

  // ...

  glutPostRedisplay();
  glutTimerFunc(1000, Timer, value + 1);
}

void Idle()
{
  glutPostRedisplay();
}

void ChangeSize(GLsizei w, GLsizei h)
{
  GLfloat fAspect;
  
  // Prevent a divide by zero
  if(h == 0)
    h = 1;
  
  // Set Viewport to window dimensions
  glViewport(0, 0, w, h);
  
  fAspect = (GLfloat)w/(GLfloat)h;
  
  // Reset coordinate system
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  
  // Produce the perspective projection
  gluPerspective(60.0f,    // fovy
		 fAspect,  // aspect
		 10.0,     // zNear
		 100.0     // zFar
		 );

  // Positioning the camera
  gluLookAt(0.0, 0.0, 50.0, // eye
	    0.0, 0.0, 0.0,  // center
	    0.0, 1.0, 0.0   // up
	    );
  
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void ProcessMenu(int value)
{
  switch(value)
    {
    case 1:
	dMode = 0;
      break;
      
    case 2:
	dMode = 1;
      break;
      
    case 3:
	dMode = 2;
      break;
      
    case 4:
	exit(0);
      break;

    default:
      break;
    }
  
  glutPostRedisplay();
}

int main(int argc, char* argv[])
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  glutCreateWindow("Kor-alaku textura polygonon");
  glutReshapeFunc(ChangeSize);
  glutSpecialFunc(SpecialKeys);
  glutKeyboardFunc(Keyboard);
  glutDisplayFunc(RenderScene);
  glutTimerFunc(1000, Timer, 1); // 1 mp mulva meghivodik a Timer() fuggveny
  glutIdleFunc(Idle); // Idle(), ha nem tortenik semmi

  MenuID = glutCreateMenu(ProcessMenu);
  glutAddMenuEntry("Negyzetes textura negyzetre feszitve", 1);
  glutAddMenuEntry("Negyzetes textura trapezra feszitve", 2);
  glutAddMenuEntry("Kor alaku textura korre feszitve", 3);
  glutAddMenuEntry("Kilepes", 3);
  glutAttachMenu(GLUT_RIGHT_BUTTON);

  SetupRC();
  glutMainLoop();
  
  return 0;
}