static void draw_tunnel(void);
static void vblank(void);
-static int nframes, backbuf;
+static int nframes, num_vbl, backbuf;
static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
static unsigned char *tex;
static uint16_t bnstate;
}
}
+#define TUN_U(x) ((x) & 0x3f)
+#define TUN_V(x) (((x) >> 7) & 0x1ff)
+
__attribute__((noinline, target("arm"), section(".iwram")))
static void draw_tunnel(void)
{
- int i, j, tx, ty, angle, depth, zoffs, uoffs, flip, tunturn;
+ int i, j, tx, ty, u, v, angle, depth, zoffs, uoffs, flip, tunturn;
static int tunsweep;
uint16_t pptop, ppbot;
uint16_t *top, *bot;
flip = tunsweep < 0;
tunturn = abs(tunsweep) & 0x1f;
- zoffs = nframes;
-
- uoffs = flip ? -nframes : nframes;
+ zoffs = num_vbl;
+ uoffs = 0;//(flip ? -num_vbl : num_vbl) >> 2;
top = vram[backbuf];
bot = vram[backbuf] + 159 * 240 / 2;
for(i=0; i<80; i++) {
for(j=0; j<240/2; j++) {
tun = *--tunptr;
- tun = (tun >> 16) | (tun << 16);
- angle = tun & 0xff;
- depth = (tun >> 8) & 0xff;
- tx = ~((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
+ angle = TUN_U(tun >> 16);
+ depth = TUN_V(tun >> 16);
+ tx = ~(angle - uoffs) & 0x1f;
+ ty = (depth + zoffs) & 0x1f;
pptop = tex[(ty << 5) + tx];
- tx = ((angle >> 1) + uoffs) & 0x1f;
+ tx = (angle + uoffs) & 0x1f;
ppbot = tex[(ty << 5) + tx];
- angle = (tun >> 16) & 0xff;
- depth = (tun >> 24) & 0xff;
- tx = ~((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
+ angle = TUN_U(tun);
+ depth = TUN_V(tun);
+ tx = ~(angle - uoffs) & 0x1f;
+ ty = (depth + zoffs) & 0x1f;
pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
- tx = ((angle >> 1) + uoffs) & 0x1f;
+ tx = (angle + uoffs) & 0x1f;
ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
*top++ = pptop;
for(j=0; j<240/2; j++) {
tun = *tunptr++;
- angle = tun & 0xff;
- depth = (tun >> 8) & 0xff;
- tx = ((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
+ angle = TUN_U(tun);
+ depth = TUN_V(tun);
+ tx = (angle - uoffs) & 0x1f;
+ ty = (depth + zoffs) & 0x1f;
pptop = tex[(ty << 5) + tx];
- tx = ~((angle >> 1) + uoffs) & 0x1f;
+ tx = ~(angle + uoffs) & 0x1f;
ppbot = tex[(ty << 5) + tx];
- angle = (tun >> 16) & 0xff;
- depth = (tun >> 24) & 0xff;
- tx = ((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
+ angle = TUN_U(tun >> 16);
+ depth = TUN_V(tun >> 16);
+ tx = (angle - uoffs) & 0x1f;
+ ty = (depth + zoffs) & 0x1f;
pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
- tx = ~((angle >> 1) + uoffs) & 0x1f;
+ tx = ~(angle + uoffs) & 0x1f;
ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
*top++ = pptop;
int16_t mat[4];
static short gate_speed;
+ num_vbl++;
+
bnstate = ~REG_KEYINPUT;
if(bnstate & BN_DPAD) {
if(gate_speed < 5) {