Add 'package-glfw/' from commit 'a8f2a899cdd0bb4316b7d50f2ee3296bf6fb208f'

git-subtree-dir: package-glfw
git-subtree-mainline: cddb3ce509
git-subtree-split: a8f2a899cd

package-glfw/src/main.zig

@@ -0,0 +1,25 @@
+const std = @import("std");
+
+const c = @cImport({
+    @cInclude("GLFW/glfw3.h");
+});
+
+pub fn main() !void {
+    if (c.glfwInit() == 0) {
+        @panic("GLFW Initialization failed");
+    }
+    defer c.glfwTerminate();
+
+    // todo error callback
+
+    const win = c.glfwCreateWindow(640, 480, "Hello Zig!", null, null);
+    if (win == null) {
+        @panic("GLFW window creation failed");
+    }
+    defer c.glfwDestroyWindow(win);
+
+    while (c.glfwWindowShouldClose(win) == 0) {
+        c.glfwPollEvents();
+        c.glfwSwapBuffers(win);
+    }
+}