#[SOLVED] how to fix this glfw window resize bug

10 messages · Page 1 of 1 (latest)

hidden vortex
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This is only happens when i use glfwSetCursorPosCallback and glfwSetFramebufferSizeCallback simultaneously.

dapper stratus
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Could you send some code?

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People probably wont answer the question if its "how do i fix da issue?" and nothing else.

hidden vortex
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this part is most suspect



CursorPosCallback :: proc "c" (window: glfw.WindowHandle, xpos, ypos: f64) {
    context = g_ctx
    @(static) firstMouse := true;
    @(static) lastX: f32;
    @(static) lastY: f32;
    @(static) sensitivity: f32 = 0.1;
    if firstMouse {
        lastX = f32(xpos);
        lastY = f32(ypos);
        firstMouse = false;
    }

    xoffset := (f32(xpos) - lastX) * sensitivity;
    yoffset := (lastY - f32(ypos)) * sensitivity; // reversed since y-coordinates go from bottom to top

    lastX = f32(xpos);
    lastY = f32(ypos);

    camera.yaw += xoffset;
    camera.pitch += yoffset;
    update_camera_rotation(&camera)
}


setup_callbacks :: proc(window: glfw.WindowHandle) {
    FramebufferSizeCallback :: proc "c" (window: glfw.WindowHandle, width, height: c.int) {
        gl.Viewport(0,0,width, height);
    }

    KeyCallback :: proc "c" (window: glfw.WindowHandle, key, scancode, action, mods: i32) {
        if key == glfw.KEY_ESCAPE && action == glfw.PRESS {
            should_exit = true
        }
    }

    glfw.SetFramebufferSizeCallback(window, FramebufferSizeCallback);
    glfw.SetKeyCallback(window, KeyCallback);
    glfw.SetCursorPosCallback(window, CursorPosCallback);
}


...

    FramebufferSizeCallback :: proc "c" (window: glfw.WindowHandle, width, height: c.int) {
        gl.Viewport(0,0,width, height);
    }
hidden vortex
#

FINALLY i sovled it

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[SOLVED] how to fix this glfw window resize bug

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i had to do this

....
frame_buffer_changed := false // global flag
    FramebufferSizeCallback :: proc "c" (window: glfw.WindowHandle, width, height: c.int) {
        frame_buffer_changed = true;
        context = g_ctx
        gl.Viewport(0,0,width, height);
    }

cursor_pos_changed := false // global flag
xpos, ypos: f64 // global mouse cursor position set
CursorPosCallback :: proc "c" (window: glfw.WindowHandle, _xpos, _ypos: f64) {
    cursor_pos_changed = true;
    xpos = _xpos
    ypos = _ypos
  }
...
    glfw.SetFramebufferSizeCallback(window, FramebufferSizeCallback);
    glfw.SetCursorPosCallback(window, CursorPosCallback);
...
cursor_pos_handle :: proc (window: glfw.WindowHandle) {
    @(static) firstMouse := true;
    @(static) lastX: f32;
    @(static) lastY: f32;
    @(static) sensitivity: f32 = 0.1;
    if frame_buffer_changed {
        frame_buffer_changed = false
        return
    } 
    if firstMouse {
        lastX = f32(xpos);
        lastY = f32(ypos);
        firstMouse = false;
    }

    xoffset := (f32(xpos) - lastX) * sensitivity;
    yoffset := (lastY - f32(ypos)) * sensitivity; // reversed since y-coordinates go from bottom to top

    lastX = f32(xpos);
    lastY = f32(ypos);

    fmt.println(xpos, ypos)

    camera.yaw += xoffset;
    camera.pitch += yoffset;
    update_camera_rotation(&camera)
}

...
// IN MAIN LOOP
    if cursor_pos_changed {
        cursor_pos_handle(window)
        cursor_pos_changed = false;
    }
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this makes it so mouse cursor movement is synchronous idk if its a good idea but yea, that fixed that problem