mirrors/OpenRCT2
1
0
Fork 0
mirror of https://github.com/OpenRCT2/OpenRCT2 synced 2026-01-18 20:43:04 +01:00
Code Issues Releases Wiki Activity

Optimize Mixer::EffectPanS16

Browse Source
This commit is contained in:
Daniël Heres
2015-10-23 12:40:35 +02:00
parent b33a8fc101
commit 831dc631c8
1 changed files with 10 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/audio/mixer.cpp
View File

@@ -738,10 +738,17 @@ void Mixer::MixChannel(Channel& channel, uint8* data, int length)
void Mixer::EffectPanS16(Channel& channel, sint16* data, int length)
{
const float dt = 1 / (length * 2);
float left_volume = channel.oldvolume_l;
float right_volume = channel.oldvolume_r;
const float d_left = dt * channel.volume_l;
const float d_right = dt * channel.volume_r;
for (int i = 0; i < length * 2; i += 2) {
float t = (float)i / (length * 2);
data[i] = (sint16)(data[i] * ((1.0 - t) * channel.oldvolume_l + t * channel.volume_l));
data[i + 1] = (sint16)(data[i + 1] * ((1.0 - t) * channel.oldvolume_r + t * channel.volume_r));
data[i] = (sint16)(data[i] * left_volume);
data[i + 1] = (sint16)(data[i + 1] * right_volume);
left_volume += d_left;
right_volume += d_right;
}
}