13 static void draw_tunnel(void);
14 static void vblank(void);
16 static int nframes, backbuf;
17 static uint16_t *vram[] = { (uint16_t*)VRAM_LFB_FB0_ADDR, (uint16_t*)VRAM_LFB_FB1_ADDR };
18 static unsigned char *tex;
19 static uint16_t bnstate;
22 static uint16_t oam[4 * MAX_SPR];
24 static short x = 120, y = 80;
25 static unsigned char rot;
27 static int32_t tunrot;
28 static int32_t tunmat[4], tunx, tuny;
37 REG_DISPCNT = 4 | DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1;
39 vblperf_setcolor(0xff);
42 spr_setup(16, 16, spr_game_pixels, spr_game_cmap);
46 spr_oam_clear(oam, 0);
47 spr_oam_clear(oam, 1);
48 spr_oam_clear(oam, 2);
49 spr_oam_clear(oam, 3);
51 cdst = (uint16_t*)CRAM_BG_ADDR;
53 for(i=0; i<256; i++) {
54 *cdst++ = CONV_RGB24_RGB15(csrc[0], csrc[1], csrc[2]);
58 fillblock_16byte(vram[0], 0xffffffff, 240 * 160 / 16);
59 fillblock_16byte(vram[1], 0xffffffff, 240 * 160 / 16);
61 tex = iwram_sbrk(32 * 32);
62 memcpy(tex, tuncross_pixels, 32 * 32);
69 REG_BG2X = (120 << 8) - scale * 120;
70 REG_BG2Y = (80 << 8) - scale * 80;
72 /*select_input(BN_DPAD);*/
75 screen_vblank = vblank;
80 backbuf = ++nframes & 1;
82 bnstate = ~REG_KEYINPUT;
93 __attribute__((noinline, target("arm"), section(".iwram")))
94 static void draw_tunnel(void)
96 int i, j, tx, ty, angle, depth, zoffs, uoffs, flip, tunturn;
98 uint16_t pptop, ppbot;
100 uint32_t tun, *tunptr;
102 //tunsweep = SIN(nframes) >> 4;
104 if((bnstate & BN_RT) && tunsweep > -31) tunsweep--;
105 if((bnstate & BN_LT) && tunsweep < 31) tunsweep++;
108 tunturn = abs(tunsweep) & 0x1f;
112 uoffs = flip ? -nframes : nframes;
115 bot = vram[backbuf] + 159 * 240 / 2;
116 tunptr = tunmap + tunturn * 9600;
120 for(i=0; i<80; i++) {
121 for(j=0; j<240/2; j++) {
123 tun = (tun >> 16) | (tun << 16);
126 depth = (tun >> 8) & 0xff;
127 tx = ~((angle >> 1) - uoffs) & 0x1f;
128 ty = ((depth >> 1) + zoffs) & 0x1f;
129 pptop = tex[(ty << 5) + tx];
130 tx = ((angle >> 1) + uoffs) & 0x1f;
131 ppbot = tex[(ty << 5) + tx];
133 angle = (tun >> 16) & 0xff;
134 depth = (tun >> 24) & 0xff;
135 tx = ~((angle >> 1) - uoffs) & 0x1f;
136 ty = ((depth >> 1) + zoffs) & 0x1f;
137 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
138 tx = ((angle >> 1) + uoffs) & 0x1f;
139 ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
148 for(i=0; i<80; i++) {
149 for(j=0; j<240/2; j++) {
153 depth = (tun >> 8) & 0xff;
154 tx = ((angle >> 1) - uoffs) & 0x1f;
155 ty = ((depth >> 1) + zoffs) & 0x1f;
156 pptop = tex[(ty << 5) + tx];
157 tx = ~((angle >> 1) + uoffs) & 0x1f;
158 ppbot = tex[(ty << 5) + tx];
160 angle = (tun >> 16) & 0xff;
161 depth = (tun >> 24) & 0xff;
162 tx = ((angle >> 1) - uoffs) & 0x1f;
163 ty = ((depth >> 1) + zoffs) & 0x1f;
164 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
165 tx = ~((angle >> 1) + uoffs) & 0x1f;
166 ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
176 __attribute__((noinline, target("arm"), section(".iwram")))
177 static void vblank(void)
181 static short gate_speed;
183 bnstate = ~REG_KEYINPUT;
184 if(bnstate & BN_DPAD) {
189 if(bnstate & BN_LEFT) x -= gate_speed;
190 if(bnstate & BN_RIGHT) x += gate_speed;
191 if(bnstate & BN_UP) y -= gate_speed;
192 if(bnstate & BN_DOWN) y += gate_speed;
202 if(bnstate & BN_A) rot -= 2;
203 if(bnstate & BN_B) rot += 2;
206 spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
207 SPR_ROTSCL | SPR_ROTSCL_SEL(0));
213 spr_transform(oam, 0, mat);
216 dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);