Window changes size randomly when dragged abruptly between 2 monitors

support
1

Hi I am using the most basic HelloWorld example:

#include <stdio.h>
#include <stdlib.h>

#include "GLFW/glfw3.h"

const int width = 960;
const int height = 640;

void error_callback(int error, const char* description) {
    fputs(description, stderr);
}

int main() {
    GLFWwindow* window;
    glfwSetErrorCallback(error_callback);
    if (!glfwInit()) {
        exit(EXIT_FAILURE);
    }

    window = glfwCreateWindow(width, height, "Simple example", NULL, NULL);
    if (!window) {
        glfwTerminate();
        exit(EXIT_FAILURE);
    }
    
    glfwMakeContextCurrent(window);

    while (!glfwWindowShouldClose(window)) {
        glfwWaitEvents();

        glfwSwapBuffers(window);
    }

    glfwDestroyWindow(window);
    glfwTerminate();
    exit(EXIT_SUCCESS);
}

When the window is abruptly shaken between 2 monitors it sometimes changes size randomly (sometimes it grows, sometimes it shrinks). Is it kind of bug?
By the way softly moving between the 2 monitors has normal effect, and I saw this topic: link, my problem isn’t related to GLFW_SCALE_TO_MONITOR .

2

Hi and welcome to the GLFW forum!

I’ve not heard of this before, and can’t replicate on the multi monitor system I have available at the moment (Windows 10, latest GLFW, 2 same monitors AMD GPU with latest WHQL drivers).

Can you replicate with a GLFW sample built from source with cmake?

If so some more details about your system would be useful such as what OS (& window manager if Linux) are you running on & what GPU and drivers you are using along with some info on the 2 monitors and their sizes and any scaling settings if present.

Cheers,

Doug.