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Fast-Forward Frameskip improvement (#13834)

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Tony 2022-04-06 17:39:25 +03:00 committed by GitHub
parent bf579df8b9
commit 85fef3427a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 1 deletions
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24
gfx/video_driver.c
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@ -3575,6 +3575,9 @@ void video_driver_frame(const void *data, unsigned width,
static retro_time_t frame_time_accumulator;
static float last_fps, frame_time;
static uint64_t last_used_memory, last_total_memory;
/* Mark the start of nonblock state for
* ignoring initial previous frame time */
static int8_t nonblock_active;
/* Initialise 'last_frame_duped' to 'true'
* to ensure that the first frame is rendered */
static bool last_frame_duped = true;
@ -3639,9 +3642,20 @@ void video_driver_frame(const void *data, unsigned width,
!(video_info.menu_is_alive ||
(last_frame_duped && !!data)))
{
retro_time_t frame_time_accumulator_prev = frame_time_accumulator;
retro_time_t frame_time_delta = new_time - last_time;
/* Ignore initial previous frame time
* to prevent rubber band startup */
if (!nonblock_active)
nonblock_active = -1;
else if (nonblock_active < 0)
nonblock_active = 1;
/* Accumulate the elapsed time since the
* last frame */
frame_time_accumulator += new_time - last_time;
if (nonblock_active > 0)
frame_time_accumulator += frame_time_delta;
/* Render frame if the accumulated time is
* greater than or equal to the expected
@ -3655,6 +3669,11 @@ void video_driver_frame(const void *data, unsigned width,
{
frame_time_accumulator -= video_st->core_frame_time;
/* Prevent external frame limiters from
* pushing fast forward ratio down to 1x */
if (frame_time_accumulator + frame_time_accumulator_prev < video_st->core_frame_time)
frame_time_accumulator -= frame_time_delta;
/* If fast forward is working correctly,
* the actual frame time will always be
* less than the expected frame time.
@ -3669,7 +3688,10 @@ void video_driver_frame(const void *data, unsigned width,
}
}
else
{
nonblock_active = 0;
frame_time_accumulator = 0;
}
last_time = new_time;
last_frame_duped = !data;