physics: fix and refactor unsticking

[xonotic/darkplaces.git] / snd_mix.c

diff --git a/snd_mix.c b/snd_mix.c
index 736d6ea1964f54ab7d11485daafde3d5d498f039..d8ea1dbe3764a297ead5aef44712325d5d901ee4 100644 (file)
--- a/snd_mix.c
+++ b/snd_mix.c
@@ -310,6 +310,66 @@ static void S_ConvertPaintBuffer(portable_sampleframe_t *painted_ptr, void *rb_p
 }
 
 
+
+/*
+===============================================================================
+
+UNDERWATER EFFECT
+
+Muffles the intensity of sounds when the player is underwater
+
+===============================================================================
+*/
+
+static struct
+{
+       float intensity;
+       float alpha;
+       float accum[SND_LISTENERS];
+}
+underwater = {0.f, 1.f, {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f}};
+
+void S_SetUnderwaterIntensity(void)
+{
+       float target = cl.view_underwater ? bound(0.f, snd_waterfx.value, 2.f) : 0.f;
+
+       if (underwater.intensity < target)
+       {
+               underwater.intensity += cl.realframetime * 4.f;
+               underwater.intensity = min(underwater.intensity, target);
+       }
+       else if (underwater.intensity > target)
+       {
+               underwater.intensity -= cl.realframetime * 4.f;
+               underwater.intensity = max(underwater.intensity, target);
+       }
+
+       underwater.alpha = underwater.intensity ? exp(-underwater.intensity * log(12.f)) : 1.f;
+}
+
+static void S_UnderwaterFilter(int endtime)
+{
+       int i;
+       int sl;
+
+       if (!underwater.intensity)
+       {
+               if (endtime > 0)
+                       for (sl = 0; sl < SND_LISTENERS; sl++)
+                               underwater.accum[sl] = paintbuffer[endtime-1].sample[sl];
+               return;
+       }
+
+       for (i = 0; i < endtime; i++)
+               for (sl = 0; sl < SND_LISTENERS; sl++)
+               {
+                       underwater.accum[sl] += underwater.alpha * (paintbuffer[i].sample[sl] - underwater.accum[sl]);
+                       paintbuffer[i].sample[sl] = underwater.accum[sl];
+               }
+}
+
+
+
 /*
 ===============================================================================
 
@@ -580,6 +640,9 @@ void S_MixToBuffer(void *stream, unsigned int bufferframes)
 
                S_SoftClipPaintBuffer(paintbuffer, totalmixframes, snd_renderbuffer->format.width, snd_renderbuffer->format.channels);
 
+               S_UnderwaterFilter(totalmixframes);
+
+
 #ifdef CONFIG_VIDEO_CAPTURE
                if (!snd_usethreadedmixing)
                        S_CaptureAVISound(paintbuffer, totalmixframes);