rasterize: remove a recent depth buffering regression in advance wars tile rendering

desmume/src/gfx3d.h

@@ -53,7 +53,10 @@
 inline u32 gfx3d_extendDepth_15_to_24(u32 depth)
 {
 	//formula from http://nocash.emubase.de/gbatek.htm#ds3drearplane
-	return (depth*0x200)+((depth+1)>>15)*0x01FF;
+	//return (depth*0x200)+((depth+1)>>15)*0x01FF;
+	//but this is identical for values 0..0x7FFF. prove it to yourself with brute force.
+	//i think this isnt right since we can't get up to 0x00FFFFFF
+	return depth<<9;
 }
 
 #define TEXMODE_NONE 0

desmume/src/rasterize.cpp

@@ -501,7 +501,7 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
 	}
 	else
 	{
-		if(depth>=destFragment.depth+1) 
+		if(depth>=destFragment.depth) 
 		{
 			goto depth_fail;
 		}