Viewport wrong with 1280x1024

Hello,

I am writing some OpenGL Applications with SDL as WindowManager. I have a Problem with the resolution of 1280x1024. When i start the Program (Not Fullscreen) it looks fine like here:

http://data.whosme.de/denginewindow.PNG

But as soon as i move the Window by click and hold the mouse on the window title and move the whole window, then my Viewport gets moved like that: There are 16 more pixels above, that i canno reach. But my glClearColor is reaching that area as you see:

http://data.whosme.de/denginewindow2.PNG

With other Resolutions it is working. Maybe its because that 1280/1024 = 1.25 is and 1024/768 = 1.33, 640/480 = 1.33 is and so on.

Here is my Code for the Viewport:

void init(int theWidth, int theHeight) {
        myWidth     = cast(float) theWidth;
        myHeight    = cast(float) theHeight;

		glClearColor(0.3f, 0.3f, 0.5f, 1.0f);
		glShadeModel(GL_SMOOTH);
		glEnable(GL_DEPTH_TEST);
		glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
		glDepthFunc(GL_LEQUAL);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

		glEnable(GL_TEXTURE_2D);

        join3D();
    };

    void refresh() {
        SDL_GL_SwapBuffers();
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glLoadIdentity();
        //refresh screen
    };

    void uninit() {

    };

    void  join2D() {
        glMatrixMode (GL_PROJECTION);
        glLoadIdentity();

        glOrtho(0, myWidth, 0, myHeight,0,1);

        glMatrixMode (GL_MODELVIEW);
        glLoadIdentity();
    };

    void join3D() {
        glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(90.0f, myWidth / myHeight, 0.1f, 1024.0f);
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
    };

Ehm, I don’t see a glViewport call anywhere…

N.

oh… ehe
You re right!

I put glViewport(0, 0, theWidth, theHeight); now into my void init() function.

Its nearly the same Problem. Again just with 1280 x 1024 and just on Windowed Mode and when i move the Window. But this time the Viewport is too high. And when i move the Window its jumping down.

Thats the way it is before moving the Window:
http://data.whosme.de/denginewindow4.PNG

And after moving the Window it shows correct as on this screenshot:
http://data.whosme.de/denginewindow.PNG

greetings

Try calling glViewport whenever the window is resized.

But the WIndow is not getting resized. I am just moving it. Additional to that i only have that problem with that 1280x1024 resolution.