/* Libraries we use */
#include <GL/gl.h>
#include <GL/glu.h>

/* Some definitions */
#define WIDTH 800
#define HEIGHT 800
#define TITLE "Josh's Wavefront Object Viewer"

/* Some function prototypes */
void	display(void);
void	mouse(int button, int state, int x, int y);
void	motion(int x, int y);

/* Some global variables */
float	rotationMatrix[16];
int	startx, starty;

/* The program's main entry point */
int	main(int argc, char *argv[])
{
	/* OpenGL initialization */
	glShadeModel(GL_SMOOTH);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	float lpos[] = {0.0f, -6.0f, 0.0f, 1.0f};
	glLightfv(GL_LIGHT0, GL_POSITION, lpos);
	glEnable(GL_CULL_FACE);
	glClearColor(0, .3, 0.5, 1);
	/* Initialize the default rotation matrix */
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glGetFloatv(GL_MODELVIEW_MATRIX, rotationMatrix);
	return 0;
}

/* This function is called to display the scene each refresh */
void	display(void)
{
	glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
	glLoadIdentity();
	glMultMatrixf(rotationMatrix);
}

/* handle mouse button press/release events */
void	mouse(int button, int state, int x, int y)
{
	startx = x;
	starty = y;
}

/* handle mouse motion events */
void	motion(int x, int y)
{
	glLoadIdentity();
	glRotatef(y-starty, 1, 0, 0);
	glRotatef(x-startx, 0, 0, 1);
	glMultMatrixf(rotationMatrix);
	glGetFloatv(GL_MODELVIEW_MATRIX, rotationMatrix);
	startx=x;
	starty=y;
}