Subversion Repositories gelsvn

//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 dgamma = 2.2f;
static float dexposure = 0.f;

Vec3uc tonemap(const Vec3f& v)
{
    Vec3f u = v * std::pow(2.f, dexposure);
    float r = mt_random() - 0.5f;

    Vec3uc I;
    for (int i=0; i<3; ++i)
    {
        float c = std::pow(u[i], 1.f / dgamma);
        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:
        dgamma = std::max(dgamma - 0.1f, 0.5f);
        break;

    case GLUT_KEY_RIGHT:
        dgamma = std::min(dgamma + 0.1f, 5.f);
        break;

    case GLUT_KEY_DOWN:
        dexposure = std::max(dexposure - 0.1f, -10.f);
        break;

    case GLUT_KEY_UP:
        dexposure = std::min(dexposure + 0.1f, 10.f);
        break;
    }

    printf("gamma: %.2f, exposure: %.2f\n", dgamma, dexposure);
    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, 1);
    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;
}