From 547bf110b2b8cfeb64212e7bd63488a4802b8493 Mon Sep 17 00:00:00 2001
From: Mitchell Richters <mjr4077au@gmail.com>
Date: Wed, 16 Sep 2020 12:31:32 +1000
Subject: [PATCH] - Blood: Create high-precision `Sinf()` and `Cosf()` inlines
 and use for player's horizon, using `calcSinTableValue()` from the backend,
 bypassing game's `costable[]`.

---
 source/blood/src/misc.h         | 10 ++++++++++
 source/blood/src/player.cpp     |  4 ++--
 source/blood/src/prediction.cpp |  4 ++--
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/source/blood/src/misc.h b/source/blood/src/misc.h
index 6a3e9b442..3b539d1d0 100644
--- a/source/blood/src/misc.h
+++ b/source/blood/src/misc.h
@@ -90,6 +90,16 @@ inline int Cos(int ang)
     return costable[ang & 2047];
 }
 
+inline double Sinf(double ang)
+{
+    return (1 << 30) * sin(BANG2RAD * ang);
+}
+
+inline double Cosf(double ang)
+{
+    return (1 << 30) * sin(BANG2RAD * (ang + 512.));
+}
+
 inline int SinScale16(int ang)
 {
     return FixedToInt(costable[(ang - 512) & 2047]);
diff --git a/source/blood/src/player.cpp b/source/blood/src/player.cpp
index 42ab50308..6606e4498 100644
--- a/source/blood/src/player.cpp
+++ b/source/blood/src/player.cpp
@@ -1558,9 +1558,9 @@ void ProcessInput(PLAYER *pPlayer)
     }
     pPlayer->q16look = clamp(pPlayer->q16look+pInput->q16horz, IntToFixed(-60), IntToFixed(60));
     if (pPlayer->q16look > 0)
-        pPlayer->q16horiz = IntToFixed(mulscale30(120, Sin(FixedToInt(pPlayer->q16look)<<3)));
+        pPlayer->q16horiz = FloatToFixed(fmulscale30(120., Sinf(FixedToFloat(pPlayer->q16look) * 8.)));
     else if (pPlayer->q16look < 0)
-        pPlayer->q16horiz = IntToFixed(mulscale30(180, Sin(FixedToInt(pPlayer->q16look)<<3)));
+        pPlayer->q16horiz = FloatToFixed(fmulscale30(180., Sinf(FixedToFloat(pPlayer->q16look) * 8.)));
     else
         pPlayer->q16horiz = 0;
     int nSector = pSprite->sectnum;
diff --git a/source/blood/src/prediction.cpp b/source/blood/src/prediction.cpp
index 0f0cf4111..03cfa333f 100644
--- a/source/blood/src/prediction.cpp
+++ b/source/blood/src/prediction.cpp
@@ -232,9 +232,9 @@ static void fakeProcessInput(PLAYER *pPlayer, InputPacket *pInput)
     predict.at20 = clamp(predict.at20+pInput->q16horz, IntToFixed(-60), IntToFixed(60));
 
     if (predict.at20 > 0)
-        predict.at24 = mulscale30(IntToFixed(120), Sin(FixedToInt(predict.at20<<3)));
+        predict.at24 = FloatToFixed(fmulscale30(120., Sinf(FixedToFloat(predict.at20) * 8.)));
     else if (predict.at20 < 0)
-        predict.at24 = mulscale30(IntToFixed(180), Sin(FixedToInt(predict.at20<<3)));
+        predict.at24 = FloatToFixed(fmulscale30(180., Sinf(FixedToFloat(predict.at20) * 8.)));
     else
         predict.at24 = 0;