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CameraHandler.cpp
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#include "CameraHandler.h"
#include "ppm.h"
#include <iostream>
#include "math.h"
#include <chrono>
#include <future>
using namespace std;
CameraHandler::CameraHandler(Camera& cam) : camera(cam)
{
w = -1 * camera.gaze;
v = camera.up;
u = crossProduct(v, w);
float left, right, top, bottom;
left = cam.near_plane.x;
right = cam.near_plane.y;
bottom = cam.near_plane.z;
top = cam.near_plane.w;
Vec3f m = cam.position + (cam.gaze * cam.near_distance);
q = m + u * left + v * top;
suConstant = (right - left) / cam.image_width;
svConstant = (top - bottom) / cam.image_height;
e = cam.position;
nx = cam.image_width;
ny = cam.image_height;
image = new unsigned char[nx*ny*3];
}
Ray CameraHandler::generateRay(int i, int j)
{
float su, sv;
Vec3f s;
su = (i + 0.5) * suConstant;
sv = (j + 0.5) * svConstant;
s = q + u * su - v * sv;
Ray ray(e, s - e);
return ray;
}
Ray CameraHandler::generateRay()
{
return Ray();
}
void CameraHandler::render()
{
auto t_start = std::chrono::high_resolution_clock::now();
cout << "rendering for file: " << camera.image_name<< " started at time" << endl;
Ray r1, r2, r3, r4;
int i,j;
for ( j = 0; j < ny; j++) {
for ( i = 0; i < nx-3; i+=4) {
/*if ( (i == 0) && (((j*100) % nx/100*100) == 0)) {
auto t_end = std::chrono::high_resolution_clock::now();
double elapsed_time_ms = std::chrono::duration<double, std::milli>(t_end - t_start).count();
cout << "rendering... %" << ((j * 100) / (nx / 100 * 100)) << " completed elapsed time: "<<(int) elapsed_time_ms/60/1000 << " minutes "<< ((int)elapsed_time_ms/1000%60)<<" seconds " << endl;
}*/
r1 = generateRay(i, j);
r2 = generateRay(i+1, j);
r3 = generateRay(i+2, j);
r4 = generateRay(i+3, j);
auto rgbf_1_handle = std::async(std::launch::async,static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r1,camera.near_distance);
auto rgbf_2_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r2,camera.near_distance);
auto rgbf_3_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r3,camera.near_distance);
auto rgbf_4_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r4,camera.near_distance);
Vec3f rgbf_1 = rgbf_1_handle.get();
if (rgbf_1.x < 0 || rgbf_1.x > 255 || rgbf_1.y < 0 || rgbf_1.y > 255 || rgbf_1.z < 0 || rgbf_1.z > 255) {
rgbf_1.x = min(255, max(0,(int) rgbf_1.x));
rgbf_1.y = min(255, max(0, (int)rgbf_1.y));
rgbf_1.z = min(255, max(0, (int)rgbf_1.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i)*3] = rgbf_1.x;
image[(nx * j + i)*3 + 1] = rgbf_1.y;
image[(nx * j + i)*3 + 2] = rgbf_1.z;
Vec3f rgbf_2 = rgbf_2_handle.get();
if (rgbf_2.x < 0 || rgbf_2.x > 255 || rgbf_2.y < 0 || rgbf_2.y > 255 || rgbf_2.z < 0 || rgbf_2.z > 255) {
rgbf_2.x = min(255, max(0,(int) rgbf_2.x));
rgbf_2.y = min(255, max(0, (int)rgbf_2.y));
rgbf_2.z = min(255, max(0, (int)rgbf_2.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 1)*3] = rgbf_2.x;
image[(nx * j + i + 1)*3 + 1] = rgbf_2.y;
image[(nx * j + i + 1 )*3 + 2] = rgbf_2.z;
Vec3f rgbf_3 = rgbf_3_handle.get();
if (rgbf_3.x < 0 || rgbf_3.x > 255 || rgbf_3.y < 0 || rgbf_3.y > 255 || rgbf_3.z < 0 || rgbf_3.z > 255) {
rgbf_3.x = min(255, max(0,(int) rgbf_3.x));
rgbf_3.y = min(255, max(0, (int)rgbf_3.y));
rgbf_3.z = min(255, max(0, (int)rgbf_3.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 2)*3] = rgbf_3.x;
image[(nx * j + i + 2)*3 + 1] = rgbf_3.y;
image[(nx * j + i + 2 )*3 + 2] = rgbf_3.z;
Vec3f rgbf_4 = rgbf_4_handle.get();
if (rgbf_4.x < 0 || rgbf_4.x > 255 || rgbf_4.y < 0 || rgbf_4.y > 255 || rgbf_4.z < 0 || rgbf_4.z > 255) {
rgbf_4.x = min(255, max(0,(int) rgbf_4.x));
rgbf_4.y = min(255, max(0, (int)rgbf_4.y));
rgbf_4.z = min(255, max(0, (int)rgbf_4.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 3)*3] = rgbf_4.x;
image[(nx * j + i + 3)*3 + 1] = rgbf_4.y;
image[(nx * j + i + 3 )*3 + 2] = rgbf_4.z;
}
if(i<nx){
// process remaining ones here
if(nx%4==1){
r1 = generateRay(i, j);
auto rgbf_1_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r1,camera.near_distance);
Vec3f rgbf_1 = rgbf_1_handle.get();
if (rgbf_1.x < 0 || rgbf_1.x > 255 || rgbf_1.y < 0 || rgbf_1.y > 255 || rgbf_1.z < 0 || rgbf_1.z > 255) {
rgbf_1.x = min(255, max(0,(int) rgbf_1.x));
rgbf_1.y = min(255, max(0, (int)rgbf_1.y));
rgbf_1.z = min(255, max(0, (int)rgbf_1.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i)*3] = rgbf_1.x;
image[(nx * j + i)*3 + 1] = rgbf_1.y;
image[(nx * j + i)*3 + 2] = rgbf_1.z;
}
else if(nx%4==2){
r1 = generateRay(i, j);
r2 = generateRay(i+1, j);
auto rgbf_1_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r1,camera.near_distance);
auto rgbf_2_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r2,camera.near_distance);
Vec3f rgbf_1 = rgbf_1_handle.get();
if (rgbf_1.x < 0 || rgbf_1.x > 255 || rgbf_1.y < 0 || rgbf_1.y > 255 || rgbf_1.z < 0 || rgbf_1.z > 255) {
rgbf_1.x = min(255, max(0,(int) rgbf_1.x));
rgbf_1.y = min(255, max(0, (int)rgbf_1.y));
rgbf_1.z = min(255, max(0, (int)rgbf_1.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i)*3] = rgbf_1.x;
image[(nx * j + i)*3 + 1] = rgbf_1.y;
image[(nx * j + i)*3 + 2] = rgbf_1.z;
Vec3f rgbf_2 = rgbf_2_handle.get();
if (rgbf_2.x < 0 || rgbf_2.x > 255 || rgbf_2.y < 0 || rgbf_2.y > 255 || rgbf_2.z < 0 || rgbf_2.z > 255) {
rgbf_2.x = min(255, max(0,(int) rgbf_2.x));
rgbf_2.y = min(255, max(0, (int)rgbf_2.y));
rgbf_2.z = min(255, max(0, (int)rgbf_2.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 1)*3] = rgbf_2.x;
image[(nx * j + i + 1)*3 + 1] = rgbf_2.y;
image[(nx * j + i + 1 )*3 + 2] = rgbf_2.z;
}
else if(nx%4==3){ // process the last [i]th [i+1]st [i+2]nd elements.
r1 = generateRay(i, j);
r2 = generateRay(i+1, j);
r3 = generateRay(i+2, j);
auto rgbf_1_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r1, camera.near_distance);
auto rgbf_2_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r2, camera.near_distance);
auto rgbf_3_handle = std::async(std::launch::async, static_cast<Vec3f(Ray::*)(float)>(&Ray::calculateColor), &r3, camera.near_distance);
Vec3f rgbf_1 = rgbf_1_handle.get();
if (rgbf_1.x < 0 || rgbf_1.x > 255 || rgbf_1.y < 0 || rgbf_1.y > 255 || rgbf_1.z < 0 || rgbf_1.z > 255) {
rgbf_1.x = min(255, max(0,(int) rgbf_1.x));
rgbf_1.y = min(255, max(0, (int)rgbf_1.y));
rgbf_1.z = min(255, max(0, (int)rgbf_1.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i)*3] = rgbf_1.x;
image[(nx * j + i)*3 + 1] = rgbf_1.y;
image[(nx * j + i)*3 + 2] = rgbf_1.z;
Vec3f rgbf_2 = rgbf_2_handle.get();
if (rgbf_2.x < 0 || rgbf_2.x > 255 || rgbf_2.y < 0 || rgbf_2.y > 255 || rgbf_2.z < 0 || rgbf_2.z > 255) {
rgbf_2.x = min(255, max(0,(int) rgbf_2.x));
rgbf_2.y = min(255, max(0, (int)rgbf_2.y));
rgbf_2.z = min(255, max(0, (int)rgbf_2.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 1)*3] = rgbf_2.x;
image[(nx * j + i + 1)*3 + 1] = rgbf_2.y;
image[(nx * j + i + 1 )*3 + 2] = rgbf_2.z;
Vec3f rgbf_3 = rgbf_3_handle.get();
if (rgbf_3.x < 0 || rgbf_3.x > 255 || rgbf_3.y < 0 || rgbf_3.y > 255 || rgbf_3.z < 0 || rgbf_3.z > 255) {
rgbf_3.x = min(255, max(0,(int) rgbf_3.x));
rgbf_3.y = min(255, max(0, (int)rgbf_3.y));
rgbf_3.z = min(255, max(0, (int)rgbf_3.z));
}
// min max might be checked if neccessary if not checked in calculate color
image[(nx * j + i + 2)*3] = rgbf_3.x;
image[(nx * j + i + 2)*3 + 1] = rgbf_3.y;
image[(nx * j + i + 2 )*3 + 2] = rgbf_3.z;
}
}
}
write_ppm(camera.image_name.c_str(),(unsigned char*) image, camera.image_width, camera.image_height);
}