Editing Openai/692b5dfe-c870-8001-8b1b-e406111f0f53 (section)

=== Think of a window as the piece of glass your GPU will eventually paint onto. ===

In Windows, a window is actually created by the OS API (Win32 API).
In Linux, windows come from systems like X11 or Wayland.
In macOS, they come from Cocoa (Objective-C).

The BIG problem:

===== So Vulkan cannot assume one method. =====

That’s why we use GLFW (or SDL).
GLFW hides OS differences and gives you a simple API:

<syntaxhighlight lang="cpp">glfwInit();
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API); // important for Vulkan
GLFWwindow* window = glfwCreateWindow(800, 600, "My Window", nullptr, nullptr);

</syntaxhighlight>

===== If you forget: =====

<syntaxhighlight lang="cpp">glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);

</syntaxhighlight>

GLFW will try to create an OpenGL context.
This breaks Vulkan.

===== Do you understand why Vulkan doesn’t create windows itself? =====

(Just answer yes or no.
If no, I’ll re-explain simpler.)