__attribute__((noinline, target("arm"), section(".iwram")))
static void draw_tunnel(void)
{
- int i, j, tx, ty, angle, depth, zoffs, uoffs;
- uint16_t pptop;
- uint16_t *top;
- uint16_t tun;
- int32_t startx, starty;
- uint16_t *tmap = (uint16_t*)tunmap;
+ int i, j, tx, ty, angle, depth, zoffs, uoffs, flip, tunturn;
+ static int tunsweep;
+ uint16_t pptop, ppbot;
+ uint16_t *top, *bot;
+ uint32_t tun, *tunptr;
- zoffs = nframes;
+ //tunsweep = SIN(nframes) >> 4;
+
+ if((bnstate & BN_RT) && tunsweep > -31) tunsweep--;
+ if((bnstate & BN_LT) && tunsweep < 31) tunsweep++;
- /*
- if(bnstate & KEY_LT) tunrot++;
- if(bnstate & KEY_RT) tunrot--;
- */
- tunrot = nframes;
+ flip = tunsweep < 0;
+ tunturn = abs(tunsweep) & 0x1f;
- tunmat[0] = COS(tunrot);
- tunmat[1] = -SIN(tunrot);
- tunmat[2] = SIN(tunrot);
- tunmat[3] = COS(tunrot);
- tunx = (128 << 8) - tunmat[0] * 120 + tunmat[1] * -80;
- tuny = (128 << 8) - tunmat[2] * 120 + tunmat[3] * -80;
+ zoffs = nframes;
- uoffs = tunrot;
+ uoffs = flip ? -nframes : nframes;
top = vram[backbuf];
- for(i=0; i<160; i++) {
- startx = tunx;
- starty = tuny;
- for(j=0; j<240/2; j++) {
- tx = (tunx >> 8) & 0xff;
- ty = (tuny >> 8) & 0xff;
- tun = tmap[(ty << 8) + tx];
-
- tunx += tunmat[0];
- tuny += tunmat[2];
-
- angle = tun & 0xff;
- depth = (tun >> 8) & 0xff;
- tx = ((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
- pptop = tex[(ty << 5) + tx];
-
- tx = (tunx >> 8) & 0xff;
- ty = (tuny >> 8) & 0xff;
- tun = tmap[(ty << 8) + tx];
-
- tunx += tunmat[0];
- tuny += tunmat[2];
-
- angle = tun & 0xff;
- depth = (tun >> 8) & 0xff;
- tx = ((angle >> 1) - uoffs) & 0x1f;
- ty = ((depth >> 1) + zoffs) & 0x1f;
- pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
-
- *top++ = pptop;
+ bot = vram[backbuf] + 159 * 240 / 2;
+ tunptr = tunmap + tunturn * 9600;
+
+ if(flip) {
+ tunptr += 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;
+ pptop = tex[(ty << 5) + tx];
+ tx = ((angle >> 1) + 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;
+ pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
+ tx = ((angle >> 1) + uoffs) & 0x1f;
+ ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
+
+ *top++ = pptop;
+ *bot++ = ppbot;
+ }
+ bot -= 240;
+ tunptr += 240;
+ }
+ } else {
+ for(i=0; i<80; i++) {
+ 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;
+ pptop = tex[(ty << 5) + tx];
+ tx = ~((angle >> 1) + 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;
+ pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
+ tx = ~((angle >> 1) + uoffs) & 0x1f;
+ ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
+
+ *top++ = pptop;
+ *bot++ = ppbot;
+ }
+ bot -= 240;
}
-
- tunx = startx + tunmat[1];
- tuny = starty + tunmat[3];
}
}