Here is some simple, basic code to open up a window in GLFW. For more tutorials on how to draw triangles and render graphics to a screen, check out: https://learnopengl.com/. The tutorials are in C++, but it might be possible to translate them into Jai.
#import "glfw";
#import "GL";
main :: () {
if !glfwInit() then return;
defer glfwTerminate();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
window := glfwCreateWindow(640, 480, "GLFW Window", null, null);
if !window then return;
defer glfwDestroyWindow(window);
glfwMakeContextCurrent(window);
while !glfwWindowShouldClose(window) {
glfwSwapBuffers(window);
glfwPollEvents();
}
}