From: John Tsiombikas <nuclear@member.fsf.org>
Date: Tue, 16 Mar 2021 03:24:14 +0000 (+0200)
Subject: semi-transparent delete window
X-Git-Tag: v1.0~5
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=gba_blender;a=commitdiff_plain;h=b03d543f0fdec08c05c0ee69cbbefe2f745a7507

semi-transparent delete window
---

diff --git a/src/gbaregs.h b/src/gbaregs.h
index a85b814..e54e801 100644
--- a/src/gbaregs.h
+++ b/src/gbaregs.h
@@ -225,6 +225,24 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #define BGCNT_SZ_TX_512X512		BGCNT_SZ(3)
 #define BGCNT_SZ_RS_1024X1024	BGCNT_SZ(3)
 
+/* REG_BLDCNT bits */
+#define BLDCNT_A_BG0		0x0001
+#define BLDCNT_A_BG1		0x0002
+#define BLDCNT_A_BG2		0x0004
+#define BLDCNT_A_BG3		0x0008
+#define BLDCNT_A_OBJ		0x0010
+#define BLDCNT_A_BACKDROP	0x0020
+#define BLDCNT_B_BG0		0x0100
+#define BLDCNT_B_BG1		0x0200
+#define BLDCNT_B_BG2		0x0400
+#define BLDCNT_B_BG3		0x0800
+#define BLDCNT_B_OBJ		0x1000
+#define BLDCNT_B_BACKDROP	0x2000
+
+#define BLDCNT_ALPHA		0x0040
+#define BLDCNT_BRIGHTEN		0x0080
+#define BLDCNT_DARKEN		0x00c0
+
 /* REG_IF bits */
 #define IF_VBLANK		0x0001
 #define IF_HBLANK		0x0002
diff --git a/src/main.c b/src/main.c
index af2f6d3..7dc1a99 100644
--- a/src/main.c
+++ b/src/main.c
@@ -117,6 +117,8 @@ int main(void)
 	dma_copy16(3, fbptr[1], bgimg_pixels, 240 * 160 / 2, 0);
 
 	init_sprites();
+	REG_BLDCNT = BLDCNT_ALPHA | BLDCNT_B_BG2;
+	REG_BLDALPHA = 0x040c;
 
 	xgl_init();
 	xgl_viewport(0, 0, 240, VP_HEIGHT);
@@ -231,7 +233,8 @@ static void show_msgbox(int en)
 
 	if(en) {
 		for(i=0; i<3; i++) {
-			set_sprite(oam, SIDX_DEL0 + i, SNAM_DEL0 + i * 8, 42 + i * 64, 42, 0, SPR_SZ64);
+			set_sprite(oam, SIDX_DEL0 + i, SNAM_DEL0 + i * 8, 42 + i * 64, 50, 0,
+					SPR_SZ64 | SPR_BLEND);
 		}
 	} else {
 		for(i=0; i<3; i++) {