#include <SDL.h>

#include "raytracer.h"

int w = 512;

int h = 200;

float *render_buffer;

Raytracer rt;

Camera cam;

void update(SDL_Surface *screen)

{

	rt.render(w, h, render_buffer);

	if ( SDL_MUSTLOCK(screen) ) {

		if ( SDL_LockSurface(screen) < 0 ) {

			return;

		}

	}

	Uint32 *bufp = (Uint32 *)screen->pixels;

	unsigned char c[3];

	for (float *fd = render_buffer; fd != render_buffer + w*h*3; fd += 3)

	{

		for (int i = 0; i < 3; i++)

		{

			if (fd[i] > 1.0)

				c[i] = 255;

			else

				c[i] = (unsigned char)(fd[i] * 255.0);

		}

		*bufp = SDL_MapRGB(screen->format, c[0], c[1], c[2]);

		bufp++;

	}

	if ( SDL_MUSTLOCK(screen) ) {

		SDL_UnlockSurface(screen);

	}

	SDL_UpdateRect(screen, 0, 0, w, h);

	SDL_Flip(screen);

}

int main()

{

	/* initialize SDL */

	SDL_Surface *screen;

	if( SDL_Init(SDL_INIT_VIDEO) < 0 ) {

		fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());

		exit(1);

	}

	atexit(SDL_Quit);

	screen = SDL_SetVideoMode(w, h, 32, SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_RESIZABLE);

	if ( screen == NULL ) {

		fprintf(stderr, "Unable to set video mode: %s\n", SDL_GetError());

		exit(1);

	}

	/* initialize raytracer and prepare scene */

	render_buffer = (float *) malloc(w*h*3*sizeof(float));

	rt.setThreads(2);

	KdTree top;

	rt.setTop(&top);

	Light light1(Vector3(2.0, -5.0, -5.0), Colour(0.7, 0.3, 0.6));

	rt.addlight(&light1);

	Light light2(Vector3(-2.0, 10.0, 2.0), Colour(0.4, 0.6, 0.3));

	rt.addlight(&light2);

	Material mat_sph(Colour(1.0, 1.0, 1.0));

	for (int y=0; y<20; y++)

		for (int x=0; x<20; x++)

			rt.addshape(new Sphere(Vector3(x-10, (float)random()/RAND_MAX*5.0, y-10), 0.45, &mat_sph));

	rt.setCamera(&cam);

	cam.setEye(Vector3(0,0,10));

	/* build kd-tree */

	top.optimize();

	/* loop... */

	SDL_Event event;

	bool quit = false;

	float roty = 0.0, rotx = 0.0, move = 0.0;

	while (!quit)

	{

		while (SDL_PollEvent(&event))

		{

			switch (event.type) {

				case SDL_VIDEORESIZE:

					w = event.resize.w;

					h = event.resize.h;

					render_buffer = (float *) realloc(render_buffer, w*h*3*sizeof(float));

					screen = SDL_SetVideoMode(w, h, 32, SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_RESIZABLE);

					break;

				case SDL_KEYDOWN:

					if (event.key.keysym.sym == SDLK_ESCAPE) {

						quit = true;

						break;

					}

					if (event.key.keysym.sym == SDLK_LEFT) {

						roty = -0.01;

						break;

					}

					if (event.key.keysym.sym == SDLK_RIGHT) {

						roty = +0.01;

						break;

					}

					if (event.key.keysym.sym == SDLK_DOWN) {

						rotx = +0.01;

						break;

					}

					if (event.key.keysym.sym == SDLK_UP) {

						rotx = -0.01;

						break;

					}

					if (event.key.keysym.sym == SDLK_w) {

						move = +0.5;

						break;

					}

					if (event.key.keysym.sym == SDLK_s) {

						move = -0.5;

						break;

					}

					break;

				case SDL_KEYUP:

					if (event.key.keysym.sym == SDLK_LEFT || event.key.keysym.sym == SDLK_RIGHT) {

						roty = 0.0;

						break;

					}

					if (event.key.keysym.sym == SDLK_UP || event.key.keysym.sym == SDLK_DOWN) {

						rotx = 0.0;

						break;

					}

					if (event.key.keysym.sym == SDLK_w || event.key.keysym.sym == SDLK_s) {

							move = 0.0;

							break;

						}

					break;

				case SDL_QUIT:

					quit = true;

			}

		}

		cam.rotate(Quaternion(cos(roty),0,sin(roty),0).normalize());

		cam.rotate(Quaternion(cos(rotx),cam.u[0]*sin(rotx),0,cam.u[2]*sin(rotx)).normalize());

		cam.u.y = 0;

		cam.u.normalize();

		cam.move(move,0,0);

		update(screen);

	}

	free(render_buffer);

}