4 files changed, 150 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..03f2f20
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.direnv
+.ccls
+.clang-format
+.ccls-cache
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..d24a185
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1633083543,
+        "narHash": "sha256-thXKms0SvDirYb8/Hw0zqAE1TsuSFWd0y51mSzkPGLU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "92609f3d9bc3acffbdbe54fa1c591a885612aa73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..21b787c
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,57 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    }:
+    let
+      allPrograms = [ 1 ];
+      supportedSystems = [ "x86_64-linux" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
+      nixpkgsFor = forAllSystems (system:
+        import nixpkgs { inherit system; }
+      );
+    in
+    {
+      devShell = forAllSystems
+        (system:
+          let
+            pkgs = nixpkgsFor."${system}";
+          in
+          with pkgs;
+          mkShell {
+            buildInputs = [ gcc glew glfw glm freeglut mesa_glu clang-tools ];
+          });
+
+      apps = forAllSystems
+        (system:
+          let
+            pkgs = nixpkgsFor."${system}";
+            execs = with builtins; map toString allPrograms;
+            mkApp = name: with pkgs; stdenv.mkDerivation {
+              name = "${name}";
+              src = ./src;
+              buildInputs = [ gcc glew glfw glm freeglut mesa_glu ];
+              unpackPhase = ''
+                true
+              '';
+              buildPhase = ''
+                gcc -o main $src/${name}/main.c -lglut -lGLU -lGL
+              '';
+              installPhase = ''
+                install -Dm755 main $out/bin/main
+              '';
+            };
+          in
+          with pkgs;
+          lib.genAttrs execs (p: {
+            type = "app";
+            program = "${mkApp p}/bin/main";
+          }));
+    };
+}
diff --git a/src/1/main.c b/src/1/main.c
new file mode 100644
index 0000000..f75eca5
--- /dev/null
+++ b/src/1/main.c
@@ -0,0 +1,62 @@
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <time.h>
+
+typedef GLfloat point2[2];
+
+float rand_float() { return 1 * (float)rand() / (float)RAND_MAX; }
+
+void myInit() {
+    glClearColor(1.0, 1.0, 1.0, 1.0);
+    glColor3f(rand_float(), rand_float(), rand_float());
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluOrtho2D(0.0, 500.0, 0.0, 500.0);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void triangle(point2 a, point2 b, point2 c) {
+    glBegin(GL_TRIANGLES);
+    glVertex2fv(a);
+    glVertex2fv(b);
+    glVertex2fv(c);
+    glEnd();
+}
+
+void divide_triangle(point2 a, point2 b, point2 c, int k) {
+    point2 ab, ac, bc;
+    int j;
+    if (k > 0) {
+        for (j = 0; j < 2; j++)
+            ab[j] = (a[j] + b[j]) / 2;
+        for (j = 0; j < 2; j++)
+            ac[j] = (a[j] + c[j]) / 2;
+        for (j = 0; j < 2; j++)
+            bc[j] = (b[j] + c[j]) / 2;
+
+        divide_triangle(a, ab, ac, k - 1);
+        divide_triangle(c, ac, bc, k - 1);
+        divide_triangle(b, bc, ab, k - 1);
+    } else {
+        triangle(a, b, c);
+    }
+}
+
+void display() {
+    glClear(GL_COLOR_BUFFER_BIT);
+    point2 v[3] = {{0.0, 0.0}, {250.0, 500.0}, {500.0, 0.0}};
+    divide_triangle(v[0], v[1], v[2], 8);
+    glFlush();
+}
+
+int main(int argc, char *argv[]) {
+    srand(time(0));
+    glutInit(&argc, argv);
+    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+    glutInitWindowSize(500, 500);
+    glutInitWindowPosition(0, 0);
+    glutCreateWindow("Sierpinski Gasket");
+    glutDisplayFunc(display);
+    myInit();
+    glutMainLoop();
+}