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;
100 int32_t startx, starty;
101 uint16_t *tmap = (uint16_t*)tunmap;
106 if(bnstate & KEY_LT) tunrot++;
107 if(bnstate & KEY_RT) tunrot--;
111 tunmat[0] = COS(tunrot);
112 tunmat[1] = -SIN(tunrot);
113 tunmat[2] = SIN(tunrot);
114 tunmat[3] = COS(tunrot);
115 tunx = (128 << 8) - tunmat[0] * 120 + tunmat[1] * -80;
116 tuny = (128 << 8) - tunmat[2] * 120 + tunmat[3] * -80;
121 for(i=0; i<160; i++) {
124 for(j=0; j<240/2; j++) {
125 tx = (tunx >> 8) & 0xff;
126 ty = (tuny >> 8) & 0xff;
127 tun = tmap[(ty << 8) + tx];
133 depth = (tun >> 8) & 0xff;
134 tx = ((angle >> 1) - uoffs) & 0x1f;
135 ty = ((depth >> 1) + zoffs) & 0x1f;
136 pptop = tex[(ty << 5) + tx];
138 tx = (tunx >> 8) & 0xff;
139 ty = (tuny >> 8) & 0xff;
140 tun = tmap[(ty << 8) + tx];
146 depth = (tun >> 8) & 0xff;
147 tx = ((angle >> 1) - uoffs) & 0x1f;
148 ty = ((depth >> 1) + zoffs) & 0x1f;
149 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
154 tunx = startx + tunmat[1];
155 tuny = starty + tunmat[3];
159 __attribute__((noinline, target("arm"), section(".iwram")))
160 static void vblank(void)
164 static short gate_speed;
166 bnstate = ~REG_KEYINPUT;
167 if(bnstate & BN_DPAD) {
172 if(bnstate & BN_LEFT) x -= gate_speed;
173 if(bnstate & BN_RIGHT) x += gate_speed;
174 if(bnstate & BN_UP) y -= gate_speed;
175 if(bnstate & BN_DOWN) y += gate_speed;
185 if(bnstate & BN_A) rot -= 2;
186 if(bnstate & BN_B) rot += 2;
189 spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
190 SPR_ROTSCL | SPR_ROTSCL_SEL(0));
196 spr_transform(oam, 0, mat);
199 dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);