glfw_callbacks.cpp

void scroll_callback(GLFWwindow* window, double xoffset, double yoffset) {
    if (yoffset!=0)
         camera.zoom(-yoffset);
}


void mouseButton(GLFWwindow* window, int button, int action, int mods) {
    ImGuiIO& io = ImGui::GetIO();
    if (io.WantCaptureMouse)
        return;
    mouse_buttons[button] = action;
}

void mouseMotion(GLFWwindow* window, double xpos, double ypos) {
    ImGuiIO& io = ImGui::GetIO();
    if (io.WantCaptureMouse)
        return;

    double dxn = (xpos - mouse_x) / window_w;
    double dyn = (ypos - mouse_y) / window_h;
    mouse_x = xpos;
    mouse_y = ypos;

    if (mouse_buttons[GLFW_MOUSE_BUTTON_LEFT] == GLFW_PRESS)
        camera.rotate(dxn, dyn);
    if (mouse_buttons[GLFW_MOUSE_BUTTON_RIGHT] == GLFW_PRESS)
        camera.shift_center(dxn, dyn);
}