I see, I had no idea this was such a big issue with OpenGL. I don't recall
seeing this issue in any DirectX games, so that makes sense.
Also I have tested the timer (and the test FPS in the tests folder) and it
failed on one system, passed on one other. It failed on one i7 processor
and passed on an i5 processor. I am not sure what these tests are to
determine (precision of timer?).
On Sunday, February 26, 2017 at 11:21:07 PM UTC-6, Benjamin Moran wrote:
>
> Just wanted to add that smooth scrolling is really difficult to do, and a
> lot of production games also have stutters. For example, Axiom Verge has
> exactly this same stuttering. I've been playing that recently, and you can
> notice it if you look.
>
> One trick that people do is to set the target FPS to 61, and make sure
> vsync is enabled. This will give you the smooth scrolling you desire by
> pushing against the vsync and effectively letting the GPU do it.
> Unfortunately, this won't work with higher refresh rate monitors that are
> starting to come out now, but will do the trick for the majority of users.
>
> I've seen some general OpenGL articles claiming that completely smooth
> scrolling is "impossible on the CPU" and that you need to let the GPU do it
> (as in the trick above). I'm not sure if that's true or not, since we do
> have access to much higher precision counters these days. Anyway, if we can
> improve pyglet in the area then we should do it.
>
>
> On Thursday, February 23, 2017 at 11:27:29 PM UTC+9, Benjamin Moran wrote:
>>
>> I'm not an expert on this topic, but pyglet is currently using a Waitable
>> Timer on Windows, and Glibc usleep on Linux. This should be microsecond
>> precision on both platforms. If there is a more precise way to do this,
>> then it's worth doing. The clock module actually has a built in test
>> function that you can run by: "python pyglet/clock.py"
>> There are a few options for testing.
>>
>>
>>
>> On Wednesday, February 22, 2017 at 4:03:39 PM UTC+9, Charles wrote:
>>>
>>> I've been noticing this quite often, but what essentially what happens
>>> is, the sprite 'catches' and has a small stutter as it moves. At first I
>>> thought this was a camera issue, but I have since noticed it on sprites
>>> moving without any screen movement whatsoever.
>>>
>>> The movement is fast, but there seems to be periods where it starts to
>>> stutter. This can be several in a row, to constant, to every other second,
>>> but it's there.
>>>
>>> I have reduced the issue to a basic program:
>>>
>>> import pyglet
>>>
>>> window = pyglet.window.Window(800,600, vsync=False)
>>> fps_display = pyglet.clock.ClockDisplay(color=(1,0,0,0.5))
>>>
>>> batch = pyglet.graphics.Batch()
>>>
>>> tileImg = pyglet.image.load("tile_test.png")
>>>
>>> playerImg = pyglet.image.load("square.png")
>>>
>>> group = pyglet.graphics.Group()
>>>
>>> sprites = []
>>> for i in xrange(50):
>>> for j in xrange(50):
>>> sprites.append(pyglet.sprite.Sprite(tileImg, x=i*32, y=j*32,
>>> batch=batch))
>>>
>>> playerSprite = pyglet.sprite.Sprite(playerImg, x=50, y=50, batch=batch)
>>>
>>> @window.event
>>> def on_draw():
>>> window.clear()
>>>
>>> batch.draw()
>>>
>>> def moveChar(dt, axis, val):
>>> if axis == "x":
>>> playerSprite.update(x=playerSprite.x+val)
>>> else:
>>> playerSprite.update(y=playerSprite.y+val)
>>>
>>> @window.event
>>> def on_key_press(symbol,modifiers):
>>> if symbol == pyglet.window.key.LEFT:
>>> pyglet.clock.schedule_interval(moveChar, 1/60.0, "x", -1)
>>>
>>> elif symbol == pyglet.window.key.RIGHT:
>>> pyglet.clock.schedule_interval(moveChar, 1/60.0, "x", 1)
>>>
>>> elif symbol == pyglet.window.key.UP:
>>> pyglet.clock.schedule_interval(moveChar, 1/60.0, "y", 1)
>>>
>>> elif symbol == pyglet.window.key.DOWN:
>>>
>>> pyglet.clock.schedule_interval(moveChar, 1/60.0, "y", -1)
>>>
>>> else:
>>> pyglet.clock.unschedule(moveChar)
>>>
>>>
>>> pyglet.app.run()
>>>
>>>
>>> Can anyone test this to see if they too get an issue? I am not sure if
>>> we are allowed to post links here but I have a simple video showcasing the
>>> issue: http://www.mediafire.com/file/ir7f5x5gxnbgi90/sprite-stutter.mp4
>>> (Sorry on the hosting, YT butchers the quality to where you can't see it)
>>>
>>
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