From 317202c05f732efd377dc94b510bd3ea94cee644 Mon Sep 17 00:00:00 2001
From: Fabian Greffrath <fabian@greffrath.com>
Date: Mon, 13 Jan 2020 12:08:11 +0100
Subject: [PATCH] bring back the original Spectre/Invisibility fuzz effect

Apply the original fix found in @fragglet's repository from Lee's
why_i_left_doom.html. Fixes #33
---
 Source/r_draw.c | 103 ++----------------------------------------------
 1 file changed, 3 insertions(+), 100 deletions(-)

diff --git a/Source/r_draw.c b/Source/r_draw.c
index 524dda3b..fe948851 100644
--- a/Source/r_draw.c
+++ b/Source/r_draw.c
@@ -275,7 +275,6 @@ void R_DrawTLColumn (void)
 
 #define FUZZTABLE 50 
 
-/*
 // killough 11/98: convert fuzzoffset to be screenwidth-independent
 static const int fuzzoffset[FUZZTABLE] = {
   0,-1,0,-1,0,0,-1,
@@ -345,8 +344,10 @@ void R_DrawFuzzColumn(void)
       // killough 3/20/98: use fullcolormap instead of colormaps
       // killough 11/98: use linesize
 
-      *dest = fullcolormap[6*256+dest[fuzzoffset[fuzzpos] ^ linesize]]; 
+      // fraggle 1/8/2000: fix with the bugfix from lees
+      // why_i_left_doom.html
 
+      *dest = fullcolormap[6*256+dest[fuzzoffset[fuzzpos++] ^ linesize]];
       dest += linesize;             // killough 11/98
 
       // Clamp table lookup index.
@@ -354,104 +355,6 @@ void R_DrawFuzzColumn(void)
     } 
   while (--count);
 }
-*/
-
-static const int fuzzoffset[FUZZTABLE] = {
-  1,0,1,0,1,1,0,
-  1,1,0,1,1,1,0,
-  1,1,1,0,0,0,0,
-  1,0,0,1,1,1,1,0,
-  1,0,1,1,0,0,1,
-  1,0,0,0,0,1,1,
-  1,1,0,1,1,0,1 
-}; 
-
-static int fuzzpos = 0; 
-
-//
-// Framebuffer postprocessing.
-// Creates a fuzzy image by copying pixels
-//  from adjacent ones to left and right.
-// Used with an all black colormap, this
-//  could create the SHADOW effect,
-//  i.e. spectres and invisible players.
-//
-
-// haleyjd: 03/24/09: from SMMU v3.10 source. Lee Killough released a patch
-// for this problem along with his "Why I Quit Doom" message, but that patch
-// was NOT applied to the archived source code on /idgames, and the patch
-// itself appears to be forever lost. I have no idea if this code from SMMU
-// matches the patch, or if fraggle just wrote it himself without knowledge
-// of the existing fix.
-
-// sf: restored original fuzz effect (changed in mbf)
-
-void R_DrawFuzzColumn(void) 
-{ 
-  int      count; 
-  byte     *dest; 
-  fixed_t  frac;
-  fixed_t  fracstep;     
-
-  // Adjust borders. Low... 
-  if (!dc_yl) 
-    dc_yl = 1;
-
-  // .. and high.
-  if (dc_yh == viewheight-1) 
-    dc_yh = viewheight - 2; 
-                 
-  count = dc_yh - dc_yl; 
-
-  // Zero length.
-  if (count < 0) 
-    return; 
-    
-#ifdef RANGECHECK 
-  if ((unsigned) dc_x >= MAX_SCREENWIDTH
-      || dc_yl < 0 
-      || dc_yh >= MAX_SCREENHEIGHT)
-    I_Error ("R_DrawFuzzColumn: %i to %i at %i",
-             dc_yl, dc_yh, dc_x);
-#endif
-
-  // Keep till detailshift bug in blocky mode fixed,
-  //  or blocky mode removed.
-
-  // Does not work with blocky mode.
-  dest = ylookup[dc_yl] + columnofs[dc_x];
-  
-  // Looks familiar.
-  fracstep = dc_iscale; 
-  frac = dc_texturemid + (dc_yl-centery)*fracstep; 
-
-  // Looks like an attempt at dithering,
-  // using the colormap #6 (of 0-31, a bit brighter than average).
-
-  do 
-  {
-     // Lookup framebuffer, and retrieve
-     //  a pixel that is either one column
-     //  left or right of the current one.
-     // Add index from colormap to index.
-     // killough 3/20/98: use fullcolormap instead of colormaps
-
-                //sf : hires
-     *dest = fullcolormap[6*256+
-                          dest[fuzzoffset[fuzzpos] ?   SCREENWIDTH<<hires 
-                                                   : -(SCREENWIDTH<<hires)]];
-     
-     // Clamp table lookup index.
-     if (++fuzzpos == FUZZTABLE) 
-        fuzzpos = 0;
-        
-     dest += SCREENWIDTH<<hires;
-
-     frac += fracstep; 
-  } 
-  while (count--); 
-}
-
 
 //
 // R_DrawTranslatedColumn