Setup projet and output PPM image file

3 files changed, 45 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..7da22d4
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.10)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
+
+project(path-tracer VERSION 1.0)
+
+add_executable(path-tracer src/main.cpp)
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..2cd66a9
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,37 @@
+#include <iostream>
+
+int main() {
+    size_t width = 256;
+    size_t height = 256;
+
+    // PPM format header
+    std::cout << "P3" << std::endl;
+
+    std::cout << width << std::endl;
+    std::cout << height << std::endl;
+
+    // Max color
+    std::cout << "255" << std::endl;
+
+    std::cerr << "Generating image" << std::endl;
+
+    for (size_t column = 0; column < width; column++) {
+        std::cerr << width - column << " lines remaining" << std::endl;
+
+        for (size_t row = 0; row < height; row++) {
+            auto r = double(column) / (width-1);
+            auto g = double(row) / (height-1);
+            auto 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 << '\n';
+        }
+    }
+
+    std::cerr << "Done !" << std::endl;
+
+    return 0;
+}