Main.cpp

#include "camera/Ray.h"
#include "material/BackgroundMaterial.h"
#include "material/DiffuseMaterial.h"
#include "material/texture/Constant.h"
#include "sampling/Image.h"
#include "sampling/Scene.h"
#include "shape/Background.h"
#include "shape/CirclePlane.h"
#include "shape/Sphere.h"
#include "testing/Testing.h"
#include "tools/Mat4.h"
#include <fstream>
#include <iostream>
#include <math.h>

using namespace material;
using namespace util;
using namespace test;
using namespace cam;
using namespace shapes;
using namespace std;

void writeBmp(const char* filename, Image img)
{

    int width = img.width; // Width of the image
    int height = img.height; // Height of the image

    int horizontalBytes; // Horizontal bytes to add, so the pixelarrays width is a multiple of 4
    horizontalBytes = 4 - ((width * 3) % 4);
    if (horizontalBytes == 4)
        horizontalBytes = 0;

    int pixelArraySize; // The size of the pixelArray
    pixelArraySize = ((width * 3) + horizontalBytes) * height;

    // Headers
    int header[12];
    // Bitmap file header
    char bb = 'B'; // bfType
    char mm = 'M';
    header[0] = pixelArraySize + 54; // bfSize
    header[1] = 0; // bfReserved
    header[2] = 54; // bfOffbits
    // Bitmap information header
    header[3] = 40; // biSize
    header[4] = width; // biWidth
    header[5] = height; // biHeight
    short biPLanes = 1; // biPlanes
    short biBitCount = 24; // biBitCount
    header[6] = 0; // biCompression
    header[7] = pixelArraySize; // biSizeImage
    header[8] = 0; // biXPelsPerMeter
    header[9] = 0; // biYPelsPerMeter
    header[10] = 0; // biClrUsed
    header[11] = 0; // biClrImportant

    ofstream ofile(filename, std::ios::binary);

    // Write the header in the right order
    // bfType, ...
    ofile.write(&bb, sizeof(bb));
    ofile.write(&mm, sizeof(mm));
    // ... bfSize, BfReserved, bfOffbits, biSize, biWidth, bitHeight, ...
    for (int i = 0; i < 6; i++) {
        ofile.write((char*)&header[i], sizeof(header[i]));
    }
    // ... biPlanes, bitBitCount, ...
    ofile.write((char*)&biPLanes, sizeof(biPLanes));
    ofile.write((char*)&biBitCount, sizeof(biBitCount));
    // ... biCompression, biSizeImage, biXPelsPerMeter, biYPelsPerMeter, biClrUsed, biClrImportant
    for (int i = 6; i < 12; i++) {
        ofile.write((char*)&header[i], sizeof(header[i]));
    }
    // The colors can only have a value from 0 to 255, so a char is enough to store them
    char blue, green, red;
    // Bmp is written from top to bottom
    for (int y = height - 1; y >= 0; y--) {
        for (int x = 0; x <= width - 1; x++) {
            red = ((img[{ x, y }][0]) * 255);
            green = ((img[{ x, y }][1]) * 255);
            blue = ((img[{ x, y }][2]) * 255);

            //bmp colors are bgr not rgb
            char bgr[3] = { blue, green, red };
            for (int i = 0; i < 3; i++) {
                char c0 = (bgr[i] & 0x00FF);
                //char c8 = ((bgr[i] & (unsigned int)0xFF00) >> 8);

                ofile.write(&c0, sizeof(c0));
                //ofile.write (&c8, sizeof (c8));
            }
        }
        // If needed add extra bytes after each row
        if (horizontalBytes != 0) {
            char null;
            for (int n = 0; n < horizontalBytes; n++) {
                ofile.write(&null, sizeof(null));
            }
        }
    }

    ofile.close();
}
void printBits(void const* const ptr, size_t const size)
{
    unsigned char* b = (unsigned char*)ptr;
    unsigned char byte;
    int i, j;

    for (i = size - 1; i >= 0; i--) {
        for (j = 7; j >= 0; j--) {
            byte = (b[i] >> j) & 1;
            printf("%u", byte);
        }
        printf("\n");
    }
    puts("");
}

int main()
{
    cout << "Start" << endl;
    //Image img = Image (100, 100);

    Mat4 ident;
    Mat4 camm = translate(Vec3(0, 1, 3));
    //Mat4 group22Mat = rotate (Vec3 (1, 0, 0), 0);
    CamObs obs(camm, M_PI / 2, 500, 500);
    shared_ptr<Group> group = make_shared<Group>(ident);

    BackgroundMaterial bg_colo(Vec3(1, 1, 1));
    Background bg(make_shared<BackgroundMaterial>(bg_colo));

    shared_ptr<Group> circplane_group = make_shared<Group>(ident);
    DiffuseMaterial circ_colo(Vec3(0, 1, 0.5));
    CirclePlane circ(10, make_shared<DiffuseMaterial>(circ_colo));
    circplane_group->add(make_shared<CirclePlane>(circ));

    shared_ptr<Group> sphere_group = make_shared<Group>(translate(Vec3(0, 1, 0)));
    DiffuseMaterial sphere_colo(Vec3(1, 0, 0));
    Sphere sphere(0.5, make_shared<DiffuseMaterial>(sphere_colo));
    sphere_group->add(make_shared<Sphere>(sphere));

    group->add(make_shared<Background>(bg));
    group->add(circplane_group);
    group->add(sphere_group);

    auto sc = std::make_shared<Scene>(Scene(group, obs, 3));

    size_t n = 20;
    cout << "Start render" << endl;
    Image img = raytrace(obs, sc, n * n);
    cout << "Start imaging" << endl;
    writeBmp("results/test.bmp", img);
    cout << "End" << endl;
};