#include <GL/glut.h>

#include "litscene.h"
#include "simplecamera.h"

LitScene TheScene;
SimpleCamera TheCamera(250,250);
int Nx, Ny;//resolution

#define DEPTH 4

void set_pixel(int x, int y, Colour col)
{
    	glBegin(GL_POINTS);
        	glColor3f(col.red(), col.green(), col.blue());
        	glVertex2i(x, y);
    	glEnd();
}

void display(void)
{
    	int i, j;
    	Colour col;

        /* clear the window, set it to the background colour */
    	glClearColor(0.0,0.0,0.0,0.0); /* background colour = black */
    	glClear(GL_COLOR_BUFFER_BIT);
    
    	for(i = 0; i < Nx; i++)
        for(j = 0; j < Ny; j++) {
            	Ray ray = TheCamera.ray(i,j);
            	if (TheScene.intersect(NULL, ray, col, DEPTH))
				{
					set_pixel(i,j,col); 
				}
        }
    
        /* force any unfinished OpenGL commands to be done */
    	glFlush();
    	
	cout << "Finished\n";
}


void create_window(void)
{
	Nx = TheCamera.xResolution();
	Ny = TheCamera.yResolution();

	
        /* create a window with the desired size and title */   
    	glutInitWindowSize(Nx, Ny);
    	glutCreateWindow("simple graphics");

        /* specify the function to be used for rendering in this window */
    	glutDisplayFunc(display);

    	glMatrixMode(GL_PROJECTION);
    	glLoadIdentity();
    	
    	gluOrtho2D(0.0,(double)Nx-1,0.0,(double)Ny-1);
    	glViewport(0,0,Nx,Ny);
}

/***************************************************************************/
/* The main function */
/***************************************************************************/
int main(int argc, char **argv)
{
	/* initialise the window manager library */
    	glutInit(&argc, argv);

        /* set up the camera */
      	TheCamera.setResolution(250,250);
    	TheCamera.setVPWindow(-2.0,2.0,-2.0,2.0);
    	TheCamera.zcop() = 2.0;
    	   
        /* read the scene from standard input*/
    	cin >> TheScene;
    	
    	cout << TheScene << "\n";

        /* open a window of the specified size */
    	create_window();

        /* enter the event loop */    
    	glutMainLoop();
}