initial commit

.gitignore

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+# output image
+image.ppm
+
+# binary
+flark
+
+# CMake
+# https://github.com/github/gitignore/blob/master/CMake.gitignore
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+project(flark)
+
+add_executable(flark main.cpp)
+

README.md

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+# Flark
+
+Ray tracing rendering experiments
+
+https://raytracing.github.io/

main.cpp

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+#include <iostream>
+
+const int WIDTH = 256;
+const int HEIGHT = 256;
+
+int main()
+{
+    std::cout << "P3" << std::endl;
+    std::cout << WIDTH << ' ' << HEIGHT << "\n255\n";
+
+    for (int y = HEIGHT - 1; y >= 0; --y)
+    {
+        std::cerr << "\rScanlines remaining: " << y << ' ' << std::flush;
+
+        for (int x = 0; x < WIDTH; ++x)
+        {
+            double r = double(x) / (WIDTH - 1);
+            double g = double(y) / (HEIGHT - 1);
+            double b = 0.25;
+
+            int ir = static_cast<int>(255.999 * r);
+            int ig = static_cast<int>(255.999 * g);
+            int ib = static_cast<int>(255.999 * b);
+
+            std::cout << ir << ' ' << ig << ' ' << ib << std::endl;
+        }
+    }
+
+    std::cerr << "\nDone." << std::endl;
+}
+