uxn

commit 5848fbe50b9bbed18d2b70301c32826da286128a
parent 8bbe5c1dfddab6b7daccb67919954499868b7af1
Author: Sigrid Solveig Haflínudóttir <ftrvxmtrx@gmail.com>
Date:   Sat, 25 Dec 2021 16:26:01 +0100

ppu_blit: mostly cosmetic - explain blending's 4th row, gain few more cycles

Diffstat:
M
src/devices/ppu.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/devices/ppu.c b/src/devices/ppu.c
@@ -103,13 +103,14 @@ ppu_write(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 color)
 void
 ppu_blit(Ppu *p, Layer *layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint8 flipx, Uint8 flipy, Uint8 twobpp)
 {
+	Uint8 opaque = blending[4][color];
 	Uint16 v, h;
 	for(v = 0; v < 8; ++v)
 		for(h = 0; h < 8; ++h) {
 			Uint8 ch = (sprite[v + 0] >> (7 - h)) & 0x1;
 			if(twobpp)
 				ch |= ((sprite[v + 8] >> (7 - h)) & 0x1) << 1;
-			if(ch || blending[4][color])
+			if(opaque || ch)
 				ppu_write(p,
 					layer,
 					x + (flipx ? 7 - h : h),