diff --git a/.gitignore b/.gitignore
index b93a0b0..be729f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,6 +19,5 @@ config.status
 forge
 *.tar.gz
 configure
-src/forge*
 *.pkg.tar.zst
 pkg
\ No newline at end of file
diff --git a/Makefile.am b/Makefile.am
index a8d0eb1..877c428 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,5 @@
 AUTOMAKE_OPTIONS = foreign subdir-objects -Wall
 bin_PROGRAMS = forge
 forge_SOURCES = src/main.c src/args.c src/forge.c
+forge_CFLAGS = -Ofast -march=native -flto -funroll-loops -fprefetch-loop-arrays -fno-exceptions -fopenmp
 include_HEADERS = src/main.h src/args.h src/config.h src/types.h src/forge.h
\ No newline at end of file
diff --git a/Makefile.dev b/Makefile.dev
index 44d9968..deb4a01 100644
--- a/Makefile.dev
+++ b/Makefile.dev
@@ -9,7 +9,7 @@ clean:
 
 build:
 	@mkdir -p build
-	gcc -Wall src/*.c src/*.h -lglfw -lGL -lm -o build/$(TARGET)
+	gcc -Wall -Wextra src/*.c src/*.h -lglfw -lGL -lm -o build/$(TARGET)
 
 .PHONY: install
 install: build
diff --git a/README.md b/README.md
index fdfc274..89d37d6 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ TODO
 
 See [Releases](https://github.com/klemek/forge/releases)
 
-```sh
+```shell
 tar xvzf forge-x.y.z.tar.gz
 cd forge-x.y.z
 ./configure
@@ -25,7 +25,7 @@ make install
 
 ### From repository (PKGBUILD)
 
-```sh
+```shell
 git clone https://github.com/klemek/forge
 cd forge
 forge -si
@@ -34,7 +34,7 @@ forge -si
 
 ### From repository (dev version)
 
-```sh
+```shell
 git clone https://github.com/klemek/forge
 cd forge
 aclocal
@@ -59,21 +59,24 @@ options:
 
 ## Release guide
 
-```bash
+```shell
+# get latest version
+git pull origin master
 # update configure.ac with new version
 $EDITOR configure.ac
 # make full build
 make -f Makefile.dev release
+# update PKGBUILD with new version and sha256 sum
+sha256sum forge-x.y.z.tar.gz
+$EDITOR PKGBUILD
 # push to repo
 git commit -am "forge vX.Y.Z"
 git tag vX.Y.Z
 git push origin master --tags
 # create release from tag on github
-# update PKGBUILD with new sha256 sum
-sha256sum forge-x.y.z.tar.gz
+# attach .tar.gz to the github release
 make -f Makefile.dev release-arch
-git commit -am "update arch sha256"
-# add .pkg.tar.zst on the release
+# attach .pkg.tar.zst to the github release
 ```
 
 ## Roadmap
diff --git a/src/forge.c b/src/forge.c
new file mode 100644
index 0000000..9cdde6f
--- /dev/null
+++ b/src/forge.c
@@ -0,0 +1,50 @@
+#include "config.h"
+#include "types.h"
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <GLFW/glfw3.h>
+
+void error_callback(int error, const char *description) {
+  fprintf(stderr, "Error: %s\n", description);
+}
+
+static void key_callback(GLFWwindow *window, int key, int scancode, int action,
+                         int mods) {
+  if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+    glfwSetWindowShouldClose(window, GLFW_TRUE);
+}
+
+void forge_run(parameters params) {
+  GLFWwindow *window;
+  glfwSetErrorCallback(error_callback);
+
+  fprintf(stdout, "[GLFW] %s\n", glfwGetVersionString());
+
+  if (!glfwInit()) {
+    fprintf(stderr, "[GLFW] Initialization failed\n");
+    exit(1);
+  }
+
+  window = glfwCreateWindow(640, 480, PACKAGE " " VERSION, NULL, NULL);
+
+  if (!window) {
+    fprintf(stderr, "[GLFW] Window or context creation failed\n");
+    glfwTerminate();
+    exit(1);
+  }
+
+  glfwMakeContextCurrent(window);
+  glfwSetKeyCallback(window, key_callback);
+  glfwSwapInterval(1);
+
+  while (!glfwWindowShouldClose(window)) {
+    glClear(GL_COLOR_BUFFER_BIT);
+    glfwSwapBuffers(window);
+    glfwPollEvents();
+  }
+
+  glfwTerminate();
+}
\ No newline at end of file
diff --git a/src/forge.h b/src/forge.h
new file mode 100644
index 0000000..3dafa75
--- /dev/null
+++ b/src/forge.h
@@ -0,0 +1,8 @@
+#include "types.h"
+
+#ifndef FORGE_H
+#define FORGE_H
+
+void forge_run(parameters params);
+
+#endif
\ No newline at end of file