From e6779231651b08c7d2b81fb69ec8ac5a50b5a500 Mon Sep 17 00:00:00 2001
From: terminx <terminx@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Sun, 2 Nov 2014 05:35:06 +0000
Subject: [PATCH] LUT for slope recip calculations in classic. DONT_BUILD.

git-svn-id: https://svn.eduke32.com/eduke32@4714 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/eduke32/build/src/a-c.c    | 3 ++-
 polymer/eduke32/build/src/engine.c | 6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/polymer/eduke32/build/src/a-c.c b/polymer/eduke32/build/src/a-c.c
index 2529d066d..5bac2017f 100644
--- a/polymer/eduke32/build/src/a-c.c
+++ b/polymer/eduke32/build/src/a-c.c
@@ -96,6 +96,7 @@ void hlineasm4(int32_t cnt, int32_t skiploadincs, int32_t paloffs, uint32_t by,
 
 
 ///// Sloped ceiling/floor vertical line functions /////
+extern int32_t sloptable[16384];
 
 void slopevlin(intptr_t p, int32_t i, intptr_t slopaloffs, int32_t cnt, int32_t bx, int32_t by)
 {
@@ -107,7 +108,7 @@ void slopevlin(intptr_t p, int32_t i, intptr_t slopaloffs, int32_t cnt, int32_t
     slopalptr = (intptr_t *)slopaloffs;
     for (; cnt>0; cnt--)
     {
-        i = krecipasm(bz>>6); bz += bzinc;
+        i = (sloptable[(bz>>6)+8192]); bz += bzinc;
         u = bx+(inthi_t)globalx3*i;
         v = by+(inthi_t)globaly3*i;
         (*(char *)p) = *(char *)(((intptr_t)slopalptr[0])+gbuf[((u>>(32-glogx))<<glogy)+(v>>(32-glogy))]);
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 9eff744ec..fc4352bc3 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -187,6 +187,7 @@ int32_t globalx1, globaly2, globalx3, globaly3;
 };
 #endif
 
+int32_t sloptable[16384];
 static intptr_t slopalookup[16384];    // was 2048
 #if defined(USE_OPENGL)
 palette_t palookupfog[MAXPALOOKUPS];
@@ -4239,7 +4240,7 @@ static void tslopevlin(uint8_t *p, int32_t i, const intptr_t *slopalptr, int32_t
         uint8_t ch;
         uint32_t u, v;
 
-        i = krecipasm(bz>>6); bz += bzinc;
+        i = (sloptable[(bz>>6)+8192]); bz += bzinc;
         u = bx + xtou*i;
         v = by + ytov*i;
         ch = *(uint8_t *)(slopalptr[0] + buf[((u>>(32-logx))<<logy)+(v>>(32-logy))]);
@@ -8009,6 +8010,9 @@ static int32_t loadtables(void)
         for (i=0; i<2048; i++)
             reciptable[i] = divscale30(2048, i+2048);
 
+        for (i=0; i<16384; i++)
+        	sloptable[i] = krecipasm(i-8192);
+
         for (i=0; i<=512; i++)
             sintable[i] = (int16_t)(16384.f * sinf((float)i * BANG2RAD));
         for (i=513; i<1024; i++)