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//02566 framework, Anders Wang Kristensen, awk@imm.dtu.dk, 2007

#include <stdlib.h>

#include <GL/glut.h>

#include <CGLA/Vec2i.h>

#include <CGLA/Vec3uc.h>

#include "scene.hpp"

#include "camera.hpp"

#include "mesh.hpp"

#include "omni.hpp"

#include "matte.hpp"

#include "plastic.hpp"

#include "metal.hpp"

#include "glass.hpp"

#include "path_tracer.hpp"

using namespace CGLA;

//global pointer to the active scene

scene* current;

static path_tracer* renderer;

const int width = 64*8;

const int height = 64*8;

static Vec3f* film;

static Vec3uc* image;

static Vec2i pixel(0);

static bool done = false;

static float gamma = 2.2f;

static float exposure = 0.f;

Vec3uc tonemap(const Vec3f& v)

{

	Vec3f u = v * std::pow(2.f, exposure);

	float r = random() - 0.5f;

	Vec3uc I;

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

	{

		float c = std::pow(u[i], 1.f / gamma);

		c = 255.f * c + 0.5f + r;

		I[i] = clamp(int(c), 0, 255);

	}

	return I;

}

void display(void)

{

	glClear(GL_COLOR_BUFFER_BIT);

	for (int j=0; j<height; ++j)

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

			image[i + j*width] = tonemap(film[i + j*width]);

	glDrawPixels(width, height, GL_RGB, GL_UNSIGNED_BYTE, image);

	glutSwapBuffers();

	GLenum e = glGetError();

	if (e != GL_NO_ERROR)

	{

		printf("OpenGL error: %s\n", gluErrorString(e));

		exit(EXIT_FAILURE);

	}

}

void reshape(GLint width, GLint height)

{

	glMatrixMode(GL_PROJECTION);

	glLoadIdentity();

	gluOrtho2D(0, width, 0, height);

	glMatrixMode(GL_MODELVIEW);

	glLoadIdentity();

}

void special(int key, int x, int y)

{

	switch (key)

	{

	case GLUT_KEY_LEFT:

		gamma = std::max(gamma - 0.1f, 0.5f);

		break;

	case GLUT_KEY_RIGHT:

		gamma = std::min(gamma + 0.1f, 5.f);

		break;

	case GLUT_KEY_DOWN:

		exposure = std::max(exposure - 0.1f, -10.f);

		break;

	case GLUT_KEY_UP:

		exposure = std::min(exposure + 0.1f, 10.f);

		break;

	}

	printf("Gamma: %.2f, exposure: %.2f\n", gamma, exposure);

	glutPostRedisplay();

}

void keyboard(unsigned char key, int x, int y)

{

	switch (key)

	{

	case 27: //ESCAPE key

		exit(0);

		break;

	}

}

void idle(void)

{

	for (int i=0; i<width*8 && !done; ++i)

	{

		Vec3f L = renderer->compute_pixel(pixel[0], pixel[1]);

		film[pixel[0] + pixel[1] * width] = L;

		//advance

		++pixel[0];

		if (pixel[0] == width)

		{

			pixel[0] = 0;

			++pixel[1];

			if (pixel[1] == height)

			{

				done = true;

				glutIdleFunc(NULL);

			}

		}

	}

 	glutPostRedisplay();

}

int main(int argc, char* argv[])

{

	//make the scene

	current = new scene;

	//setup some materials

	matte dull_white(Vec3f(0.5f, 0.5f, 0.5f));

	matte dull_gray(Vec3f(0.4f, 0.4f, 0.4f));

	matte dull_red(Vec3f(0.6f, 0.3f, 0.2f));

	matte dull_green(Vec3f(0.3f, 0.6f, 0.2f));

	matte dull_blue(Vec3f(0.2f, 0.2f, 0.6f));

	plastic glossy_white(Vec3f(0.4f, 0.4f, 0.4f), Vec3f(0.5f), 20.f);

	plastic glossy_purple(Vec3f(0.3f, 0.1f, 0.3f), Vec3f(0.65f), 8.f);

	plastic glossy_yellow(Vec3f(0.3f, 0.3f, 0.0f), Vec3f(0.65f), 32.f);

	//for exercise 2

	glass clear(Vec3f(0.99f, 0.99f, 0.99f), 1.5f);

	metal silver(Vec3f(0.9f, 0.9f, 0.9f), 22.f, 0.177f, 3.638f);

	//setup cornell box 1mx1mx1m

	mesh floor("../../data/cornell_box/floor.obj");

	floor.set_material(&glossy_white);

	current->insert(&floor);

	mesh ceiling("../../data/cornell_box/ceiling.obj");

	ceiling.set_material(&dull_gray);

	current->insert(&ceiling);

	mesh back("../../data/cornell_box/back.obj");

	back.set_material(&silver);

	current->insert(&back);

	mesh left("../../data/cornell_box/left.obj");

	left.set_material(&dull_red);

	current->insert(&left);

	mesh right("../../data/cornell_box/right.obj");

	right.set_material(&dull_blue);

	current->insert(&right);

	//add some objects to the box

	Mat4x4f tmp;

	mesh box1("../../data/cornell_box/box1.obj");

	tmp = rotation_Mat4x4f(YAXIS, -float(M_PI)/8.f);

	tmp = translation_Mat4x4f(Vec3f(-0.3f,0.f,-0.05f)) * tmp;

	box1.set_transform(tmp);

	box1.set_material(&dull_green);

	current->insert(&box1);

	mesh box2("../../data/cornell_box/box2.obj");

	tmp = translation_Mat4x4f(Vec3f(0.25f,0.f, -0.05f));

	box2.set_transform(tmp);

	box2.set_material(&glossy_purple);

	current->insert(&box2);

	mesh teapot("../../data/cornell_box/teapot1.obj");

	tmp = rotation_Mat4x4f(YAXIS, float(M_PI/4.f));

	tmp = translation_Mat4x4f(Vec3f(-0.25f,0.25f, -0.05)) * tmp;

	teapot.set_transform(tmp);

	teapot.set_material(&silver);

	current->insert(&teapot);

	mesh sphere1("../../data/cornell_box/sphere2.obj");

	tmp = translation_Mat4x4f(Vec3f(0.25f,0.45f,-0.05f));

	sphere1.set_transform(tmp);

	sphere1.set_material(&clear);

	current->insert(&sphere1);

	mesh sphere2("../../data/cornell_box/sphere2.obj");

	tmp = translation_Mat4x4f(Vec3f(0.22f,0.15f,0.25f));

	sphere2.set_transform(tmp);

	sphere2.set_material(&glossy_yellow);

	//current->insert(&sphere2);

	//light sources

	mesh quad_light("../../data/cornell_box/quad.obj");

	tmp = rotation_Mat4x4f(XAXIS, float(M_PI));

	tmp = translation_Mat4x4f(Vec3f(0.f,0.99f,0.2f)) * tmp;

	quad_light.set_transform(tmp);

	quad_light.set_exitance(Vec3f(300,300,300));

	current->insert(&quad_light);

	mesh quad_light1("../../data/cornell_box/quad.obj");

	tmp = rotation_Mat4x4f(XAXIS, float(M_PI));

	tmp = translation_Mat4x4f(Vec3f(0.f,0.99f,0.2f)) * tmp;

	quad_light1.set_transform(tmp);

	quad_light1.set_exitance(Vec3f(0,400,0));

//	current->insert(&quad_light1);

	mesh quad_light2("../../data/cornell_box/quad.obj");

	tmp = rotation_Mat4x4f(XAXIS, float(M_PI));

	tmp = translation_Mat4x4f(Vec3f(-0.2f,0.99f,0.2f)) * tmp;

	quad_light2.set_transform(tmp);

	quad_light2.set_exitance(Vec3f(400,0,0));

//	current->insert(&quad_light2);

	mesh quad_light3("../../data/cornell_box/quad.obj");

	tmp = rotation_Mat4x4f(XAXIS, float(M_PI));

	tmp = translation_Mat4x4f(Vec3f(0.2f,0.99f,0.2f)) * tmp;

	quad_light3.set_transform(tmp);

	quad_light3.set_exitance(Vec3f(0,0,400));

//	current->insert(&quad_light3);

	omni omni_light(Vec3f(30.f));

	omni_light.set_transform(translation_Mat4x4f(Vec3f(0.0f,0.95f,0.0f)));

	//current->insert(&omni_light);

	mesh sphere_light("../../data/cornell_box/small_sphere.obj");

	sphere_light.set_transform(translation_Mat4x4f(Vec3f(0.f,0.95f,0.f)));

	sphere_light.set_exitance(Vec3f(30.f/(4.f*float(M_PI)*0.01f*0.01f)));

	//current->insert(&sphere_light);

	//setup camera (eye, center, up, focal length)

	camera pentax(

		Vec3f(0.f,0.5f,2.0f), 

		Vec3f(0.f,0.5f,0.5f), 

		Vec3f(0,1,0), 

		0.035f);

	current->set_camera(&pentax);

	//build acceleration structure

	current->initialize(8, 25);

	//create the renderer

	renderer = new path_tracer(width, height, true, 4);

	renderer->set_scene(current);

	//create the film

	film = new Vec3f[width * height];

	std::fill(film, film+width*height, Vec3f(0.3f));

	image = new Vec3uc[width * height];

	std::fill(image, image+width*height, Vec3uc(32,32,32));

	//init glut

	glutInit(&argc, argv);

	glutInitWindowSize(width, height);

	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

	glutCreateWindow("Course 02566 - IMM DTU");

	glutDisplayFunc(display);

	glutReshapeFunc(reshape);

	glutKeyboardFunc(keyboard);

	glutSpecialFunc(special);

	glutIdleFunc(idle);

	//Turn the flow of control over to GLUT

	glutMainLoop();

	//clean up

	delete current;

	delete renderer;

	return EXIT_SUCCESS;

}