From cc78c886c82ac74deebeaccb7a3c1eca64031a75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?arvid=20schr=C3=B6der?= <arvidschroeder@web.de>
Date: Tue, 13 Dec 2022 02:47:01 +0100
Subject: [PATCH] Added superrender

---
 renderer/superrenderer.cpp | 110 +++++++++++++++++++++++++++++++++++++
 renderer/superrenderer.h   |  33 +++++++++++
 2 files changed, 143 insertions(+)
 create mode 100644 renderer/superrenderer.cpp
 create mode 100644 renderer/superrenderer.h

diff --git a/renderer/superrenderer.cpp b/renderer/superrenderer.cpp
new file mode 100644
index 0000000..6c17403
--- /dev/null
+++ b/renderer/superrenderer.cpp
@@ -0,0 +1,110 @@
+//
+// Created by arvids on 13.12.22.
+//
+
+#include "superrenderer.h"
+#include "common/ray.h"
+#include <iostream>
+#include <chrono>
+#include <vector>
+#include <iomanip>
+#include "camera/camera.h"
+#include "scene/scene.h"
+
+void SuperRenderer::renderThread(const Scene *scene, Camera const *camera, Texture *image, int width, int widthStep,
+                                 int widthOffset, int height, int heightStep, int heightOffset, std::atomic<int> *k,
+                                 int const stepSize, int superSamplingFactor) {
+    float const aspectRatio = static_cast<float>(height) / width;
+    for (int y = heightOffset; y < height; y += heightStep) {
+        for (int x = widthOffset; x < width; x += widthStep) {
+            Color fragmentColor = {};
+            fragmentColor = calcSuperColor(scene, camera, width, height, superSamplingFactor, aspectRatio, y, x,
+                                           fragmentColor);
+            fragmentColor /= static_cast<float>(superSamplingFactor * superSamplingFactor);
+            image->setPixelAt(x, y, clamped(fragmentColor));
+            // Super hacky progress bar!
+            if (++*k % stepSize == 0) {
+                std::cout << "=" << std::flush;
+            }
+        }
+    }
+}
+
+Color &
+SuperRenderer::calcSuperColor(const Scene *scene, const Camera *camera, int width, int height, int superSamplingFactor,
+                              const float aspectRatio, int y, int x, Color &fragmentColor) {
+    for (int x1 = 0; x1 < superSamplingFactor; x1++) {
+        for (int y1 = 0; y1 < superSamplingFactor; y1++) {
+            float offsetX = (-0.5f + static_cast<float>(x1) / static_cast<float>(superSamplingFactor - 1));
+            float offsetY = (-0.5f + static_cast<float>(y1) / static_cast<float>(superSamplingFactor - 1));
+
+            Ray ray = camera->createRay(((static_cast<float>(x) + offsetX) / static_cast<float>(width) * 2.0f - 1),
+                                        -((static_cast<float>(y) + offsetY) / static_cast<float>(height) * 2.0f - 1) * aspectRatio);
+            fragmentColor += scene->traceRay(ray);
+        }
+    }
+    return fragmentColor;
+}
+
+Texture SuperRenderer::renderImage(Scene const &scene, Camera const &camera, int width, int height) {
+    Texture image(width, height);
+
+    // Setup timer
+    std::chrono::steady_clock::time_point start, stop;
+
+    // Reset Ray counting
+    Ray::resetRayCount();
+
+    // Super-hacky progress bar!
+    std::cout << "(SuperRenderer): Begin rendering..." << std::endl;
+    std::cout << "| 0%";
+    int const barSize = 50;
+    int const stepSize = (width * height) / barSize;
+    for (int i = 0; i < barSize - 3 - 5; ++i)
+        std::cout << " ";
+    std::cout << "100% |" << std::endl << "|";
+    std::atomic<int> k(0);
+
+    /* Start timer */ start = std::chrono::steady_clock::now();
+
+    // Spawn a thread for every logical processor -1, calling the renderThread function
+    int const nThreads = std::thread::hardware_concurrency();
+    std::vector<std::thread> threads;
+    for (int t = 0; t < nThreads - 1; ++t) {
+        threads.emplace_back(renderThread, &scene, &camera, &image, width, nThreads, t, height, 1, 0, &k, stepSize,
+                             this->superSamplingFactor);
+    }
+
+    // Call the renderThread function yourself
+    renderThread(&scene, &camera, &image, width, nThreads, nThreads - 1, height, 1, 0, &k, stepSize,
+                 this->superSamplingFactor);
+
+    // Rejoin the threads
+    for (int t = 0; t < nThreads - 1; ++t) {
+        threads[t].join();
+    }
+
+    // Stop timer
+    stop = std::chrono::steady_clock::now();
+
+    std::cout << "| Done!" << std::endl;
+
+    // Calculate the Time taken in seconds
+    double seconds = std::chrono::duration_cast<std::chrono::duration<double>>(stop - start).count();
+
+    std::cout << "Time: " << seconds << "s" << std::endl;
+
+    // Get the number of seconds per ray
+    int rays = Ray::getRayCount();
+
+    std::cout << "Paths: " << rays << std::endl;
+    std::cout << "Paths per second: " << std::fixed << std::setprecision(0) << rays / seconds << std::endl;
+
+
+    return image;
+}
+
+
+void SuperRenderer::setSuperSamplingFactor(int superSamplingFactor) {
+    SuperRenderer::superSamplingFactor = superSamplingFactor;
+}
diff --git a/renderer/superrenderer.h b/renderer/superrenderer.h
new file mode 100644
index 0000000..92c88c1
--- /dev/null
+++ b/renderer/superrenderer.h
@@ -0,0 +1,33 @@
+//
+// Created by arvids on 13.12.22.
+//
+
+#ifndef CG1_TRACER_SUPERRENDERER_H
+#define CG1_TRACER_SUPERRENDERER_H
+
+#include "renderer.h"
+#include <thread>
+#include <atomic>
+
+class SuperRenderer : public Renderer {
+public:
+    static void
+    renderThread(const Scene *scene, Camera const *camera, Texture *image, int width, int widthStep,
+                 int widthOffset, int height, int heightStep, int heightOffset, std::atomic<int> *k,
+                 int const stepSize, int superSamplingFactor);
+
+    Texture renderImage(const Scene &scene, const Camera &camera, int width, int height) override;
+    void setSuperSamplingFactor(int superSamplingFactor);
+
+private:
+private:
+
+    int superSamplingFactor;
+
+    static Color &
+    calcSuperColor(const Scene *scene, const Camera *camera, int width, int height, int superSamplingFactor,
+                   const float aspectRatio, int y, int x, Color &fragmentColor);
+};
+
+
+#endif //CG1_TRACER_SUPERRENDERER_H