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 bgmat[4];
28 static int32_t bgx, bgy;
29 static int32_t tunrot;
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);
64 /*select_input(BN_DPAD);*/
67 screen_vblank = vblank;
72 backbuf = ++nframes & 1;
74 bnstate = ~REG_KEYINPUT;
83 bgmat[0] = (COS(tunrot) * 280) >> 8;
84 bgmat[1] = (-SIN(tunrot) * 280) >> 8;
85 bgmat[2] = (SIN(tunrot) * 280) >> 8;
86 bgmat[3] = (COS(tunrot) * 280) >> 8;
87 bgx = (120 << 8) - bgmat[0] * 120 + bgmat[1] * -80;
88 bgy = (80 << 8) - bgmat[2] * 120 + bgmat[3] * -80;
94 __attribute__((noinline, target("arm"), section(".iwram")))
95 static void draw_tunnel(void)
97 int i, j, tx, ty, angle, depth, zoffs, uoffs;
98 uint16_t pptop, ppbot;
100 uint32_t tun, *tunptr;
106 top = vram[backbuf] + 20;
107 bot = vram[backbuf] + 159 * 240 / 2 + 20;
109 for(i=0; i<80; i++) {
110 for(j=0; j<160/2; j++) {
122 depth = (tun >> 8) & 0xff;
123 tx = ((angle >> 1) - uoffs) & 0x1f;
124 ty = ((depth >> 1) + zoffs) & 0x1f;
125 pptop = tex[(ty << 5) + tx];
126 tx = ~((angle >> 1) + uoffs) & 0x1f;
127 ppbot = tex[(ty << 5) + tx];
129 angle = (tun >> 16) & 0xff;
130 depth = (tun >> 24) & 0xff;
131 tx = ((angle >> 1) - uoffs) & 0x1f;
132 ty = ((depth >> 1) + zoffs) & 0x1f;
133 pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
134 tx = ~((angle >> 1) + uoffs) & 0x1f;
135 ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
145 __attribute__((noinline, target("arm"), section(".iwram")))
146 static void vblank(void)
150 static short gate_speed;
152 REG_BG2PA = bgmat[0];
153 REG_BG2PB = bgmat[1];
154 REG_BG2PC = bgmat[2];
155 REG_BG2PD = bgmat[3];
159 bnstate = ~REG_KEYINPUT;
160 if(bnstate & BN_DPAD) {
165 if(bnstate & BN_LEFT) x -= gate_speed;
166 if(bnstate & BN_RIGHT) x += gate_speed;
167 if(bnstate & BN_UP) y -= gate_speed;
168 if(bnstate & BN_DOWN) y += gate_speed;
178 if(bnstate & BN_A) rot -= 2;
179 if(bnstate & BN_B) rot += 2;
182 spr_oam(oam, 0, 512 + 256, x - 64, y - 64, SPR_256COL | SPR_SZ64 | SPR_DBLSZ |
183 SPR_ROTSCL | SPR_ROTSCL_SEL(0));
185 mat[0] = COS(rot) << 1;
186 mat[1] = -SIN(rot) << 1;
187 mat[2] = SIN(rot) << 1;
188 mat[3] = COS(rot) << 1;
189 spr_transform(oam, 0, mat);
192 dma_copy16(3, (void*)OAM_ADDR, oam, sizeof oam / 2, 0);