Test for transparency before dithering.

snes9xgit · May 6, 2018 · bd9db57 · bd9db57
1 parent 113a43c
commit bd9db57
Showing 1 changed file with 6 additions and 6 deletions.
diff --git a/fxinst.cpp b/fxinst.cpp
@@ -906,14 +906,14 @@ static void fx_plot_2bit (void)
 		return;
 #endif
 
+	if (!(GSU.vPlotOptionReg & 0x01) && !(COLR & 0xf))
+		return;
+
 	if (GSU.vPlotOptionReg & 0x02)
 		c = ((x ^ y) & 1) ? (uint8) (GSU.vColorReg >> 4) : (uint8) GSU.vColorReg;
 	else
 		c = (uint8) GSU.vColorReg;
 
-	if (!(GSU.vPlotOptionReg & 0x01) && !(c & 0xf))
-		return;
-
 	a = GSU.apvScreen[y >> 3] + GSU.x[x >> 3] + ((y & 7) << 1);
 	v = 128 >> (x & 7);
 
@@ -970,14 +970,14 @@ static void fx_plot_4bit (void)
 		return;
 #endif
 
+	if (!(GSU.vPlotOptionReg & 0x01) && !(COLR & 0xf))
+		return;
+
 	if (GSU.vPlotOptionReg & 0x02)
 		c = ((x ^ y) & 1) ? (uint8) (GSU.vColorReg >> 4) : (uint8) GSU.vColorReg;
 	else
 		c = (uint8) GSU.vColorReg;
 
-	if (!(GSU.vPlotOptionReg & 0x01) && !(c & 0xf))
-		return;
-
 	a = GSU.apvScreen[y >> 3] + GSU.x[x >> 3] + ((y & 7) << 1);
 	v = 128 >> (x & 7);