X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fgamescr.c;h=8d5f34491f67707b50c54b8f4ad343df15079d1f;hb=f6bf5b7710b9a695ddaef0ad929796a4e151268e;hp=51df533c6768a29905226e0fb8b884cf0822e3a6;hpb=2718dd43c524c4b313de8acc3cc97c497810064b;p=gbajam21

diff --git a/src/gamescr.c b/src/gamescr.c
index 51df533..8d5f344 100644
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -24,6 +24,10 @@ static uint16_t oam[4 * MAX_SPR];
 static short x = 120, y = 80;
 static unsigned char rot;
 
+static int32_t bgmat[4];
+static int32_t bgx, bgy;
+static int32_t tunrot;
+
 void gamescr(void)
 {
 	int i;
@@ -74,6 +78,15 @@ void gamescr(void)
 		vblperf_end();
 		wait_vblank();
 		present(backbuf);
+
+		tunrot = nframes;
+		bgmat[0] = (COS(tunrot) * 140) >> 8;
+		bgmat[1] = (-SIN(tunrot) * 140) >> 8;
+		bgmat[2] = (SIN(tunrot) * 140) >> 8;
+		bgmat[3] = (COS(tunrot) * 140) >> 8;
+		bgx = (120 << 8) - bgmat[0] * 120 + bgmat[1] * -80;
+		bgy = (80 << 8) - bgmat[2] * 120 + bgmat[3] * -80;
+
 		vblperf_begin();
 	}
 }
@@ -81,52 +94,51 @@ void gamescr(void)
 __attribute__((noinline, target("arm"), section(".iwram")))
 static void draw_tunnel(void)
 {
-	static int uoffs;
-	int i, j, tx, ty, angle, depth, zoffs;
+	int i, j, tx, ty, angle, depth, zoffs, uoffs;
 	uint16_t pptop, ppbot;
 	uint16_t *top, *bot;
 	uint32_t tun, *tunptr;
 
 	zoffs = nframes;
 
-	if(bnstate & BN_LT) uoffs++;
-	if(bnstate & BN_RT) uoffs--;
+	uoffs = tunrot >> 1;
 
-	top = vram[backbuf];
-	bot = vram[backbuf] + 159 * 240 / 2;
+	top = vram[backbuf] + 20;
+	bot = vram[backbuf] + 159 * 240 / 2 + 20;
 	tunptr = tunmap;
 	for(i=0; i<80; i++) {
+		for(j=0; j<160/2; j++) {
 #ifdef VBLBAR
-		top++;
-		bot++;
-		tunptr++;
-
-		for(j=1; j<240/2; j++) {
-#else
-		for(j=0; j<240/2; j++) {
+			if(j == 160/4) {
+				tunptr++;
+				top++;
+				bot++;
+				continue;
+			}
 #endif
 			tun = *tunptr++;
 
 			angle = tun & 0xff;
 			depth = (tun >> 8) & 0xff;
-			tx = ((angle >> 1) + uoffs) & 0x1f;
+			tx = ((angle >> 1) - uoffs) & 0x1f;
 			ty = ((depth >> 1) + zoffs) & 0x1f;
 			pptop = tex[(ty << 5) + tx];
-			tx = ~((angle >> 1) - uoffs) & 0x1f;
+			tx = ~((angle >> 1) + uoffs) & 0x1f;
 			ppbot = tex[(ty << 5) + tx];
 
 			angle = (tun >> 16) & 0xff;
 			depth = (tun >> 24) & 0xff;
-			tx = ((angle >> 1) + uoffs) & 0x1f;
+			tx = ((angle >> 1) - uoffs) & 0x1f;
 			ty = ((depth >> 1) + zoffs) & 0x1f;
 			pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
-			tx = ~((angle >> 1) - uoffs) & 0x1f;
+			tx = ~((angle >> 1) + uoffs) & 0x1f;
 			ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
 
 			*top++ = pptop;
 			*bot++ = ppbot;
 		}
-		bot -= 240;
+		top += 40;
+		bot -= 240 - 40;
 	}
 }
 
@@ -137,6 +149,13 @@ static void vblank(void)
 	int16_t mat[4];
 	static short gate_speed;
 
+	REG_BG2PA = bgmat[0];
+	REG_BG2PB = bgmat[1];
+	REG_BG2PC = bgmat[2];
+	REG_BG2PD = bgmat[3];
+	REG_BG2X = bgx;
+	REG_BG2Y = bgy;
+
 	bnstate = ~REG_KEYINPUT;
 	if(bnstate & BN_DPAD) {
 		if(gate_speed < 5) {
@@ -156,16 +175,17 @@ static void vblank(void)
 		gate_speed = 0;
 	}
 
-	if(bnstate & BN_A) rot--;
-	if(bnstate & BN_B) rot++;
+	if(bnstate & BN_A) rot -= 2;
+	if(bnstate & BN_B) rot += 2;
+
 
 	spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
 			SPR_ROTSCL | SPR_ROTSCL_SEL(0));
 
-	mat[0] = COS(rot) << 1;
-	mat[1] = -SIN(rot) << 1;
-	mat[2] = SIN(rot) << 1;
-	mat[3] = COS(rot) << 1;
+	mat[0] = COS(rot);
+	mat[1] = -SIN(rot);
+	mat[2] = SIN(rot);
+	mat[3] = COS(rot);
 	spr_transform(oam, 0, mat);