Add GLFW OpenGL window example

2 files changed, 45 insertions, 1 deletions

diff --git a/README.md b/README.md
index 6238c22..833a9c7 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
 # opentest
-Bloon test
+
+Sample OpenGL window example using GLFW.
+
+Compile on macOS:
+
+```
+clang main.c -o ogl_example -lglfw -framework OpenGL
+```
+
+Run:
+
+```
+./ogl_example
+```
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..3edd036
--- /dev/null
+++ b/main.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <GLFW/glfw3.h>
+
+int main(void)
+{
+    if (!glfwInit()) {
+        fprintf(stderr, "Failed to initialize GLFW\n");
+        return 1;
+    }
+
+    GLFWwindow *window = glfwCreateWindow(640, 480, "Hello OpenGL", NULL, NULL);
+    if (!window) {
+        fprintf(stderr, "Failed to create window\n");
+        glfwTerminate();
+        return 1;
+    }
+
+    glfwMakeContextCurrent(window);
+
+    while (!glfwWindowShouldClose(window)) {
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        glfwSwapBuffers(window);
+
+        glfwPollEvents();
+    }
+
+    glfwDestroyWindow(window);
+    glfwTerminate();
+    return 0;
+}