Initial commit

.clang-format

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+BasedOnStyle: LLVM

.gitignore

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+build/
+
+*.ppm
+
+.clangd/
+.cache/
+.vs/
+.vscode/
+
+compile_flags.txt

README.md

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+# Ray tracing in one week-end
+
+C implementation of the [*Ray tracing in one week-end*](https://raytracing.github.io/) series by Peter Shirley.

build.sh

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+#!/bin/bash
+
+CC=${CC:-"gcc"}
+CFLAGS=${CFLAGS:-"-Wall -Wextra -std=c18 -g"}
+LDFLAGS=${LDFLAGS:-""}
+MAIN_FILE=${MAIN_FILE:-"main.c"}
+
+# Write out compile_flags.txt for clangd
+echo "${CFLAGS}" | tr ' ' '\n' > compile_flags.txt
+
+mkdir -p build
+
+${CC} ${CFLAGS} ${MAIN_FILE} -o build/raytracer ${LDFLAGS}

main.c

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+#include <stdio.h>
+
+int main(void) {
+  const int image_width = 256;
+  const int image_height = 256;
+
+  printf("P3\n%u %u\n255\n", image_width, image_height);
+
+  for(int j = image_height - 1; j >= 0; --j) {
+    for(int i = 0; i < image_width; ++i) {
+        double r = (double)(i) / (image_width - 1);
+        double g = (double)(j) / (image_height - 1);
+        double b = 0.25;
+
+        int ir = (int)(255.999 * r);
+        int ig = (int)(255.999 * g);
+        int ib = (int)(255.999 * b);
+
+        printf("%d %d %d\n", ir, ig, ib);
+    }
+  }
+
+  return 0;
+}