rasterize: fix depth buffering again.

desmume/src/NDSSystem.cpp

@@ -1712,6 +1712,8 @@ void NDS_exec(s32 nb)
 #endif
 			}
 
+//this doesnt work anyway. why take a speed hit for public releases?
+#ifndef PUBLIC_RELEASE
 #ifdef EXPERIMENTAL_WIFI
 			// FIXME: the wifi stuff isn't actually clocked by the ARM7 clock, 
 			// but by a 22 mhz oscillator.
@@ -1737,6 +1739,7 @@ void NDS_exec(s32 nb)
 					WIFI_SoftAP_usTrigger(&wifiMac);
 				}
 			}*/
+#endif
 #endif
 		} // for (j = 0; j < INSTRUCTIONS_PER_BATCH && (!FORCE) && (execute); j++)
 

desmume/src/gfx3d.h

@@ -54,9 +54,9 @@ 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;
-	//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;
+	//I think this might be slightly faster
+	if(depth==0x7FFF) return 0x00FFFFFF;
+	else return depth<<9;
 }
 
 #define TEXMODE_NONE 0

desmume/src/rasterize.cpp

@@ -487,19 +487,8 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
 	}
 	else
 	{
-		//the traditional value
 		depth = u32floor(z*0x7FFF);
-
-		//this would work in sonic chronicles but break battles of prince of persia
-		//depth = u32floor(z*0xFFFFFF);
-
-		//so we have this compromise: 
-		depth = gfx3d_extendDepth_15_to_24(depth);
-
-		//some contemplation on the matter:
-		//it seems that everything in the ds uses 15 bit depths
-		//except that thedepth buffer is 24 bit. but nothing ever uses 24 bits!!!
-		//this makes no sense.
+		depth <<= 9;
 	}
 	if(polyAttr.decalMode)
 	{