X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fgamescr.c;fp=src%2Fgamescr.c;h=70991e8ef128c76fbd75e1e8f382e885cb82fd5c;hb=f6d4c2f2ee940cadff5c5792c789ba86b9df7d4d;hp=1b11c25796d657fbf863aedf20d4273313cfe007;hpb=622fc6ef720a41a066e1bfcbdc6e003609da2da7;p=gbajam21

diff --git a/src/gamescr.c b/src/gamescr.c
index 1b11c25..70991e8 100644
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -7,14 +7,17 @@
 #include "intr.h"
 #include "debug.h"
 
+static void draw_tunnel(void);
+
+static int nframes, backbuf;
+static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
+static unsigned char *tex;
+
 void gamescr(void)
 {
-	int i, j, tx, ty, angle, depth, nframes, backbuf, zoffs;
-	static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
-	uint16_t *cdst, *top, *bot;
+	int i;
+	uint16_t *cdst;
 	unsigned char *csrc;
-	uint32_t tun, *tunptr;
-	unsigned char *tex;
 
 	REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_FB1;
 
@@ -37,41 +40,7 @@ void gamescr(void)
 	for(;;) {
 		backbuf = ++nframes & 1;
 
-		zoffs = nframes << 1;
-
-		top = vram[backbuf];
-		bot = vram[backbuf] + 159 * 240 / 2;
-		tunptr = tunmap;
-		for(i=0; i<80; i++) {
-			top++;
-			bot++;
-			tunptr++;
-			for(j=1; j<240/2; j++) {
-				uint16_t pptop, ppbot;
-
-				tun = *tunptr++;
-
-				angle = tun & 0xff;
-				depth = (tun >> 8) & 0xff;
-				tx = ((angle >> 1) + zoffs) & 0x1f;
-				ty = ((depth >> 1) + zoffs) & 0x1f;
-				pptop = tex[(ty << 5) + tx];
-				tx = ((angle >> 1) - zoffs) & 0x1f;
-				ppbot = tex[(ty << 5) + tx];
-
-				angle = (tun >> 16) & 0xff;
-				depth = (tun >> 24) & 0xff;
-				tx = ((angle >> 1) + zoffs) & 0x1f;
-				ty = ((depth >> 1) + zoffs) & 0x1f;
-				pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
-				tx = ((angle >> 1) - zoffs) & 0x1f;
-				ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
-
-				*top++ = pptop;
-				*bot++ = ppbot;
-			}
-			bot -= 240;
-		}
+		draw_tunnel();
 
 		vblperf_end();
 		wait_vblank();
@@ -79,3 +48,46 @@ void gamescr(void)
 		vblperf_begin();
 	}
 }
+
+__attribute__((noinline, target("arm"), section(".iwram")))
+static void draw_tunnel(void)
+{
+	int i, j, tx, ty, angle, depth, zoffs;
+	uint16_t pptop, ppbot;
+	uint16_t *top, *bot;
+	uint32_t tun, *tunptr;
+
+	zoffs = nframes;
+
+	top = vram[backbuf];
+	bot = vram[backbuf] + 159 * 240 / 2;
+	tunptr = tunmap;
+	for(i=0; i<80; i++) {
+		top++;
+		bot++;
+		tunptr++;
+		for(j=1; j<240/2; j++) {
+			tun = *tunptr++;
+
+			angle = tun & 0xff;
+			depth = (tun >> 8) & 0xff;
+			tx = ((angle >> 1) + zoffs) & 0x1f;
+			ty = ((depth >> 1) + zoffs) & 0x1f;
+			pptop = tex[(ty << 5) + tx];
+			tx = ((angle >> 1) - zoffs) & 0x1f;
+			ppbot = tex[(ty << 5) + tx];
+
+			angle = (tun >> 16) & 0xff;
+			depth = (tun >> 24) & 0xff;
+			tx = ((angle >> 1) + zoffs) & 0x1f;
+			ty = ((depth >> 1) + zoffs) & 0x1f;
+			pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
+			tx = ((angle >> 1) - zoffs) & 0x1f;
+			ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
+
+			*top++ = pptop;
+			*bot++ = ppbot;
+		}
+		bot -= 240;
+	}
+}