diff --git a/src/r_draw_pal.cpp b/src/r_draw_pal.cpp
index 33c482934..9d15460af 100644
--- a/src/r_draw_pal.cpp
+++ b/src/r_draw_pal.cpp
@@ -1183,14 +1183,17 @@ namespace swrenderer
 		dest = thread->dest_for_thread(_dest_y, pitch, dest);
 		pitch *= thread->num_cores;
 
+		const PalEntry* pal = GPalette.BaseColors;
+		int _srcalpha = 32768, _destalpha = 32768;
 		do
 		{
-			const PalEntry* pal = GPalette.BaseColors;
-			// *** [SP] this is incomplete, not sure what to do here.
-			/*int r = clamp((int)pal[_srccolor].r, 0, 255) >> 2;
-			int g = clamp((int)pal[_srccolor].g, 0, 255) >> 2;
-			int b = clamp((int)pal[_srccolor].b, 0, 255) >> 2;
-			*dest = RGB256k.RGB[r][g][b];*/
+			int src_r = ((_srccolor << 3) & 0x78) * _srcalpha;
+			int src_g = ((_srccolor >> 17) & 0x78) * _srcalpha;
+			int src_b = ((_srccolor >> 7) & 0x78) * _srcalpha;
+			int r = clamp((src_r + pal[*dest].r * _destalpha)>>18, 0, 255);
+			int g = clamp((src_g + pal[*dest].g * _destalpha)>>18, 0, 255);
+			int b = clamp((src_b + pal[*dest].b * _destalpha)>>18, 0, 255);
+			*dest = RGB256k.RGB[r][g][b];
 			dest += pitch;
 		} while (--count);
 
diff --git a/src/v_video.cpp b/src/v_video.cpp
index 6e333f840..62a587281 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -144,9 +144,7 @@ DWORD Col2RGB8[65][256];
 DWORD *Col2RGB8_LessPrecision[65];
 DWORD Col2RGB8_Inverse[65][256];
 ColorTable32k RGB32k;
-#ifndef NO_RGB666
 ColorTable256k RGB256k;
-#endif
 }
 
 
@@ -666,14 +664,12 @@ static void BuildTransTable (const PalEntry *palette)
 		for (g = 0; g < 32; g++)
 			for (b = 0; b < 32; b++)
 				//RGB32k.RGB[r][g][b] = ColorMatcher.Pick ((r<<3)|(r>>2), (g<<3)|(g>>2), (b<<3)|(b>>2));
-				RGB32k.RGB[r][g][b] = 2;
-#ifndef NO_RGB666
+				RGB32k.RGB[r][g][b] = 4;
 	// create the RGB666 lookup table
 	for (r = 0; r < 64; r++)
 		for (g = 0; g < 64; g++)
 			for (b = 0; b < 64; b++)
 				RGB256k.RGB[r][g][b] = ColorMatcher.Pick ((r<<2)|(r>>4), (g<<2)|(g>>4), (b<<2)|(b>>4));
-#endif
 
 	int x, y;
 
diff --git a/src/v_video.h b/src/v_video.h
index 2079ff64b..57d15869c 100644
--- a/src/v_video.h
+++ b/src/v_video.h
@@ -463,14 +463,12 @@ union ColorTable32k
 extern "C" ColorTable32k RGB32k;
 
 // [SP] RGB666 support
-#ifndef NO_RGB666
 union ColorTable256k
 {
 	BYTE RGB[64][64][64];
 	BYTE All[64 *64 *64];
 };
 extern "C" ColorTable256k RGB256k;
-#endif
 
 // Col2RGB8 is a pre-multiplied palette for color lookup. It is stored in a
 // special R10B10G10 format for efficient blending computation.