Background color not changing

support
1

Hello all,

I’m trying to change the background color in a GLFW generated window, but it’s not changing. I tried changing the values in glClearColor() and putting glClear() in various places, even encapsulating in a class method.

Code below is very similar to the code snippet in the GLFW docs.

GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
    if (!window)
    {
        // Window or OpenGL context creation failed
        std::cout << "Error creating window!" << std::endl;
        glfwTerminate();
        exit(EXIT_FAILURE);
    }

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1);

    glClearColor(1.0f, 0.2f, 0.0f, 1.0f);

    while (!glfwWindowShouldClose(window)) 
    {
        int width, height;

        glfwGetFramebufferSize(window, &width, &height);

        glViewport(0, 0, width, height);
        glClear(GL_COLOR_BUFFER_BIT);



        glfwSwapBuffers(window);
        glfwPollEvents();
    }

Everything compiles and links well. I’m on Ubuntu 20.04, and when I tried a similar code on Visual Studio on Windows 10, everything worked perfectly.

I recompiled the GLFW library several times to determine if it was the problem.
I can’t draw anything because I can’t control color so I’m not sure how to go forward.

2

I would first try running some of the GLFW tests and examples by cloning and compiling the GitHub repository: GitHub - glfw/glfw: A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input

If those work you could then try this cmake GLFW starter which also sets the background colour.

3

It didn’t work at first, but once I installed the GLAD library, it finally worked. It was probably because the GL functions were from an older version of OpenGL on my system. GLAD updated those functions.