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constexpr unsigned Width = 1000;
constexpr double Aspect = 16.0 / 9.0;
constexpr unsigned Height = Width / Aspect;
constexpr unsigned Threads = 3;
#include "color.h"
#include "ray.h"
#include "renderer.h"
#include "sphere.h"
#include "vec3.h"
#include "view.h"
#include "world.h"
#include "imgui.h"
#include "imgui_impl_sdl2.h"
#include "imgui_impl_sdlrenderer2.h"
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <algorithm>
#include <chrono>
#include <cstring>
#include <iostream>
#include <ranges>
#include <thread>
static View Camera;
static World world;
static int SamplesPerPixel = 20;
static float Daylight = 0.5f;
static std::unique_ptr<Renderer<Threads>> renderer;
static std::chrono::time_point<std::chrono::high_resolution_clock> renderStart;
static std::chrono::duration<double> renderTime;
static color ray_color(const ray& r, int depth = 50);
static void initiateRender(SDL_Surface *canvas);
int main()
{
SDL_Init(SDL_INIT_VIDEO);
IMG_Init(IMG_INIT_PNG);
auto window = SDL_CreateWindow("raytrace", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, Width, Height, SDL_WINDOW_RESIZABLE);
auto canvas = SDL_CreateRGBSurfaceWithFormat(0, Width, Height, 32, SDL_PIXELFORMAT_RGBA8888);
auto painter = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC /*| SDL_RENDERER_ACCELERATED*/);
ImGui::CreateContext();
ImGui_ImplSDL2_InitForSDLRenderer(window, painter);
ImGui_ImplSDLRenderer2_Init(painter);
world.add(point3( 0.00, -100.50, -1.0), 100.0, Material::Lambertian, color(0.5, 1.0, 0.5));
world.add(point3(-0.50, 0.00, -1.2), 0.5, Material::Dielectric, color(1.0, 0.8, 0.8));
world.add(point3( 0.50, 0.00, -1.0), 0.5, Material::Metal, color(0.5, 0.5, 0.5));
world.add(point3(-0.05, -0.35, -0.7), 0.1, Material::Metal, color(0.8, 0.6, 0.0));
std::cout << "Spawning threads..." << std::endl;
initiateRender(canvas);
auto tex = SDL_CreateTextureFromSurface(painter, canvas);
std::cout << "Entering render..." << std::endl;
bool run = true;
for (SDL_Event event; run;) {
while (SDL_PollEvent(&event)) {
ImGui_ImplSDL2_ProcessEvent(&event);
if (event.type == SDL_QUIT) {
renderer->stop();
run = false;
}
}
ImGui_ImplSDLRenderer2_NewFrame();
ImGui_ImplSDL2_NewFrame();
ImGui::NewFrame();
ImGui::Begin("settings", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::SliderFloat("fov", &Camera.fieldOfView, 10, 160);
ImGui::SetNextItemWidth(100); ImGui::InputDouble("X", &Camera.camera.x(), 0.1, 0.05, "%.2lf");
ImGui::SameLine(); ImGui::SetNextItemWidth(100); ImGui::InputDouble("Y", &Camera.camera.y(), 0.1, 0.05, "%.2lf");
ImGui::SameLine(); ImGui::SetNextItemWidth(100); ImGui::InputDouble("Z", &Camera.camera.z(), 0.1, 0.05, "%.2lf");
ImGui::SliderInt("samples", &SamplesPerPixel, 1, 200);
ImGui::SliderFloat("shade", &Daylight, 0.f, 1.f);
if (ImGui::Button("recalculate")) {
initiateRender(canvas);
}
ImGui::SameLine();
if (ImGui::Button("export")) {
std::string filename ("screenshot_");
filename += std::to_string(int(randomN() * 1000000));
filename += ".png";
IMG_SavePNG(canvas, filename.c_str());
std::cout << "saved " << filename << std::endl;
}
ImGui::SameLine();
if (ImGui::Button("exit")) {
renderer->stop();
run = false;
}
if (*renderer) {
SDL_DestroyTexture(tex);
tex = SDL_CreateTextureFromSurface(painter, canvas);
ImGui::SameLine();
if (ImGui::Button("stop")) {
renderer->stop();
}
ImGui::Text("wait... %u%%", renderer->progress());
} else if (renderTime == std::chrono::duration<double>::zero()) {
SDL_DestroyTexture(tex);
tex = SDL_CreateTextureFromSurface(painter, canvas);
renderTime = std::chrono::high_resolution_clock::now() - renderStart;
} else {
ImGui::Text("%0.6lfs", renderTime.count());
}
ImGui::End();
ImGui::Begin("balls", nullptr, ImGuiWindowFlags_NoResize); {
char radius[] = "radius 0";
char mat[] = "mat 0";
char xpos[] = "x 0";
char ypos[] = "y 0";
char zpos[] = "z 0";
for (auto& o : std::views::drop(world.objects, 1)) {
ImGui::SetNextItemWidth(200);
ImGui::Combo(mat, reinterpret_cast<int *>(&o.M),
"Lambertian\0Metal\0Dielectric\0");
ImGui::SameLine(); ImGui::SetNextItemWidth(100);
ImGui::InputDouble(radius, &o.radius, 0.1, 0.05, "%.2lf");
ImGui::SetNextItemWidth(100);
ImGui::InputDouble(xpos, &o.center.x(), 0.05, 0.05, "%.2lf");
ImGui::SameLine(); ImGui::SetNextItemWidth(100);
ImGui::InputDouble(ypos, &o.center.y(), 0.1, 0.05, "%.2lf");
ImGui::SameLine(); ImGui::SetNextItemWidth(100);
ImGui::InputDouble(zpos, &o.center.z(), 0.1, 0.05, "%.2lf");
radius[7]++;
mat[4]++;
xpos[2]++;
ypos[2]++;
zpos[2]++;
}
if (ImGui::Button("add")) {
const point3 pos = vec3::random() * vec3(4, 1.5, 4) - vec3(2, 0, 4);
const color col = vec3::random();
world.add(pos, randomN() * 0.5 + 0.1, Material::Lambertian, col);
initiateRender(canvas);
}
if (ImGui::Button("del")) {
world.objects.pop_back();
initiateRender(canvas);
}
} ImGui::End();
ImGui::Render();
SDL_RenderClear(painter);
SDL_RenderCopy(painter, tex, nullptr, nullptr);
ImGui_ImplSDLRenderer2_RenderDrawData(ImGui::GetDrawData());
SDL_RenderPresent(painter);
std::this_thread::sleep_for(std::chrono::milliseconds(30));
}
ImGui_ImplSDLRenderer2_Shutdown();
ImGui_ImplSDL2_Shutdown();
ImGui::DestroyContext();
SDL_FreeSurface(canvas);
SDL_DestroyRenderer(painter);
SDL_DestroyWindow(window);
SDL_Quit();
}
color ray_color(const ray& r, int depth)
{
if (depth <= 0)
return {};
if (auto hit = world.hit(r); hit) {
const auto& [closest, sphere] = *hit;
const auto [atten, scat] = sphere.scatter(r, closest);
return atten * ray_color(scat, depth - 1);
} else {
const auto unitDir = r.direction().normalize();
const auto a = Daylight * (unitDir.y() + 1.0);
return (1.0 - a) * color(1.0, 1.0, 1.0) + a * color(0.5, 0.7, 1.0);
}
}
void initiateRender(SDL_Surface *canvas)
{
renderStart = std::chrono::high_resolution_clock::now();
renderTime = std::chrono::duration<double>::zero();
auto func = [format = canvas->format](auto x, auto y, auto pbuf) {
auto col = std::ranges::fold_left(std::views::iota(0, SamplesPerPixel), color(),
[y, x](color c, int i) { return c + ray_color(Camera.getRay(x, y, true)); });
col = col / SamplesPerPixel * 255;
pbuf[y * Width + x] = SDL_MapRGBA(format, col.x(), col.y(), col.z(), 255);
};
Camera.recalculate();
renderer.reset(new Renderer<Threads>(func, Width, Height, (uint32_t *)canvas->pixels));
}
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