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Faster and more precise demo skipping

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- Approximate index of wanted keyframe to decrease linear search time.
- Only apply the magic `-5` to the Keyframe calculation, to make seeking with the mouse more accurate.
- After the method returns, the specified tick will be the _next_ tick being played instead of being the current tick.
This commit is contained in:
Robert Müller 2022-08-27 12:01:36 +02:00
parent 334bdad922
commit 76cefa1c85
1 changed files with 7 additions and 10 deletions
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17
src/engine/shared/demo.cpp
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@ -939,19 +939,16 @@ int CDemoPlayer::SetPos(int WantedTick)
if(!m_File)
return -1;
// -5 because we have to have a current tick and previous tick when we do the playback
WantedTick = clamp(WantedTick, m_Info.m_Info.m_FirstTick, m_Info.m_Info.m_LastTick) - 5;
WantedTick = clamp(WantedTick, m_Info.m_Info.m_FirstTick, m_Info.m_Info.m_LastTick);
const int KeyFrameWantedTick = WantedTick - 5; // -5 because we have to have a current tick and previous tick when we do the playback
const float Percent = (KeyFrameWantedTick - m_Info.m_Info.m_FirstTick) / (float)(m_Info.m_Info.m_LastTick - m_Info.m_Info.m_FirstTick);
// get correct key frame
int KeyFrame = 0;
while(KeyFrame < m_Info.m_SeekablePoints - 1 && m_pKeyFrames[KeyFrame].m_Tick < WantedTick)
{
int KeyFrame = clamp((int)(m_Info.m_SeekablePoints * Percent), 0, m_Info.m_SeekablePoints - 1);
while(KeyFrame < m_Info.m_SeekablePoints - 1 && m_pKeyFrames[KeyFrame].m_Tick < KeyFrameWantedTick)
KeyFrame++;
}
while(KeyFrame > 0 && m_pKeyFrames[KeyFrame].m_Tick > WantedTick)
{
while(KeyFrame > 0 && m_pKeyFrames[KeyFrame].m_Tick > KeyFrameWantedTick)
KeyFrame--;
}
// seek to the correct key frame
io_seek(m_File, m_pKeyFrames[KeyFrame].m_Filepos, IOSEEK_START);
@ -961,7 +958,7 @@ int CDemoPlayer::SetPos(int WantedTick)
m_Info.m_PreviousTick = -1;
// playback everything until we hit our tick
while(m_Info.m_PreviousTick < WantedTick && IsPlaying())
while(m_Info.m_NextTick < WantedTick)
DoTick();
Play();