/* 
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

#include "windowHandler.h"
#include <stdio.h>
void WindowHandler::ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
{
	if (height==0)	// Prevent A Divide By Zero By
	{
		height=1;// Making Height Equal One
	}

	glViewport(0,0,width,height); // Reset The Current Viewport

	
	glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
	glLoadIdentity();	


	// Calculate The Aspect Ratio Of The Window
	gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
	gluLookAt (0,0,15, 0,0,0, 0,1,0);

	glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
	glLoadIdentity(); // Reset The Modelview Matrix

}


int WindowHandler::InitGL(GLvoid)										// All Setup For OpenGL Goes Here
{
	glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
	glShadeModel(GL_SMOOTH); // Enable Smooth Shading
	glClearColor(0.00f, 0.00f, 0.00f, 0.0f); // Black Background
	glClearDepth(1.0f);  // Depth Buffer Setup
	glEnable(GL_DEPTH_TEST); // Enables Depth Testing
	glDepthFunc(GL_LEQUAL);	// The Type Of Depth Testing To Do
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  // Really Nice Perspective Calculations

    return TRUE;
}


GLvoid WindowHandler::KillGLWindow(GLvoid) // Properly Kill The Window
{
	SDL_Quit();
}


BOOL WindowHandler::CreateGLWindow(char* title, int width, int height, int bits, BOOL fullscreenflag)
{
	Uint32 flags;
	int size;

	/* Initialize SDL */
	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
		fprintf(stderr, "Couldn't init SDL: %s\n", SDL_GetError());
		return FALSE;
	}

	flags = SDL_OPENGL;
	if ( fullscreenflag ) {
		flags |= SDL_FULLSCREEN;
	}
	SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 1 );
	if ( (screen = SDL_SetVideoMode(width, height, 0, flags)) == NULL ) {
		return FALSE;
	}
	SDL_GL_GetAttribute( SDL_GL_STENCIL_SIZE, &size);

	ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen

	if (!InitGL()) // Initialize Our Newly Created GL Window
	{
	  KillGLWindow();  // Reset The Display
	  return FALSE;
	}

	return TRUE;
}