Question about running the program at the same speed on any computer

Question

I made a program (in C ++ using gl / glut) for training purposes, where you can mainly run around the screen (in the first person) and have several solids around the scene. I tried to run it on another computer, and the speed was completely different, so I was looking for an item, and now I'm doing something like this:

Standby function:

    start = glutGet (GLUT_ELAPSED_TIME);
    double dt = (start-end)*30/1000;

    <all the movement*dt>

    glutPostRedisplay ();

    end = glutGet (GLUT_ELAPSED_TIME);

Display function:

    <rendering for all objects>

    glutSwapBuffers ();

My question is: is this the right way to do this? Is the scene displayed immediately after the idle function?

I tried placing end = glutGet (GLUT_ELAPSED_TIME) before glutSwapBuffers () and didn’t notice any changes, but when I put it after glutSwapBuffers () it slows down and even sometimes stops.

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Answer 1

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Answer 2

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obj.x += 100.0f * dt; // to move 100 units every second

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, , x + = v * dt.

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Answer 4

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Answer 5

, "" , GLUT, GLUT "" . GLUT - glutTimerFunc().

static void timerCallback (int value)
{
    // Calculate the deltas

    glutPostRedisplay(); // Have GLUT call your display function
    glutTimerFunc(elapsedMilliseconds, timerCallback, value);
}

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, glutTimerFunc(elapsedMilliseconds, timerCallback, value); .

Answer 6

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Answer 7

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