Window is completely white in LWJGL

Question

I have a main package like so:

// Imports and package stuff

public class Main {
    public static void main(String[] args) {
        // Initialisation code

        long window = glfwCreateWindow(800, 600, "Hello World", 0, 0);

        // Initialisation code

        glfwShowWindow(window);
        glfwMakeContextCurrent(window);
        GL.createCapabilities();
        glClearColor(0, 0, 0, 1);

        while (!glfwWindowShouldClose(window)) {
            glfwPollEvents();
            glClear(GL_COLOR_BUFFER_BIT);
            glBegin(GL_QUADS);
                glColor4f(1, 0, 0, 1);
                glVertex2f(0.5f, 0.5f);
                glVertex2f(0.5f, -0.5f);
                glVertex2f(-0.5f, -0.5f);
                glVertex2f(-0.5f, 0.5f);
            glEnd();
            glfwSwapBuffers(window);
        }

        glfwTerminate();
    }
}

(The // comments show omitted code).

I expect the output "window" to be a black window with a red rectangle in the middle, but what I'm getting is a window with a white background.

At first, I suspected it was the glClearColor line messing up (because it sets the default colour to be cleared, and maybe that was white). I tried editing the glClearColor line (I fiddled around with the alpha values, as well as the RGB), but they all resulted in the same white background.

Any help is appreciated!

Answer 1

So, I tried running your code and I was getting a NullPointerException on

glfwShowWindow(window);

So, try putting

if (!glfwInit()) {
    System.err.println("GLFW Failed to initialize!");
    System.exit(1);
}

before you create your window. This worked for me. Hope this helped!