Graphics context for example

examples/c.zig

@@ -0,0 +1,13 @@
+pub usingnamespace @cImport({
+    @cDefine("GLFW_INCLUDE_NONE", {});
+    @cInclude("GLFW/glfw3.h");
+});
+
+const vk = @import("vulkan");
+
+// usually the GLFW vulkan functions are exported if Vulkan is included,
+// but since  thats not the case here, they are manually imported.
+
+pub extern "c" fn glfwGetInstanceProcAddress(instance: vk.Instance, procname: [*:0]const u8) vk.PfnVoidFunction;
+pub extern "c" fn glfwGetPhysicalDevicePresentationSupport(instance: vk.Instance, pdev: vk.PhysicalDevice, queuefamily: u32) c_int;
+pub extern "c" fn glfwCreateWindowSurface(instance: vk.Instance, window: *GLFWwindow, allocation_callbacks: ?*const vk.AllocationCallbacks, surface: *vk.SurfaceKHR) vk.Result;