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Cocoa Port: Use [MTLDrawable present] instead of [MTLDrawable presentAtTime:]. Does this reduce microstuttering even further?

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rogerman 2022-04-18 14:54:54 -07:00
parent bd030db03f
commit 864d419513
1 changed files with 15 additions and 1 deletions
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16
desmume/src/frontend/cocoa/userinterface/MacMetalDisplayView.mm
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@ -2392,7 +2392,21 @@
[cb addScheduledHandler:^(id<MTLCommandBuffer> block) {
@autoreleasepool
{
[drawable presentAtTime:(CFTimeInterval)outputTime / 1000000000.0];
// Let's try [MTLDrawable present] instead of [MTLDrawable presentAtTime:] in
// an effort to reduce microstuttering even further. Testing on various Metal
// machines shows a minor, but still slightly noticeable, reduction in
// microstuttering.
//
// This probably works because this method is called in response to a
// CVDisplayLink output callback, which is already expecting to see a frame
// very very soon. [MTLDrawable presentAtTime:] does have a little more
// overhead than [MTLDrawable present], and so it is possible that the former
// method might be pushing the rendered frame ahead by up to 2 frames, whereas
// the latter method will always push the rendered frame at most 1 frame ahead.
// This best explains the observed behavior in certain rendering scenarios.
//[drawable presentAtTime:(CFTimeInterval)outputTime / 1000000000.0];
[drawable present];
if (drawable == [self layerDrawable0])
{