diff options
Diffstat (limited to 'sys/src/games/2600/tia.c')
| -rw-r--r-- | sys/src/games/2600/tia.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/sys/src/games/2600/tia.c b/sys/src/games/2600/tia.c new file mode 100644 index 000000000..3819fedaa --- /dev/null +++ b/sys/src/games/2600/tia.c @@ -0,0 +1,212 @@ +#include <u.h> +#include <libc.h> +#include <emu.h> +#include "dat.h" +#include "fns.h" + +int ppux=1, ppuy; +int col, pri; +u8int p0x, p1x, m0x, m1x, blx; +u16int coll; +u8int disp; +int p0difc; +int bwmod = 1<<3; + +enum { + SRCPF, + SRCP0, + SRCP1, + SRCM0, + SRCM1, + SRCBL, +}; + +static void +pixeldraw(u8int v) +{ + u32int c; + union { u32int l; u8int c[4]; } u; + u32int *p; + static u32int col[] = { + 0x000000, 0x404040, 0x6C6C6C, 0x909090, 0xB0B0B0, 0xC8C8C8, 0xDCDCDC, 0xECECEC, + 0x444400, 0x646410, 0x848424, 0xA0A034, 0xB8B840, 0xD0D050, 0xE8E85C, 0xFCFC68, + 0x702800, 0x844414, 0x985C28, 0xAC783C, 0xBC8C4C, 0xCCA05C, 0xDCB468, 0xECC878, + 0x841800, 0x983418, 0xAC5030, 0xC06848, 0xD0805C, 0xE09470, 0xECA880, 0xFCBC94, + 0x880000, 0x9C2020, 0xB03C3C, 0xC05858, 0xD07070, 0xE08888, 0xECA0A0, 0xFCB4B4, + 0x78005C, 0x8C2074, 0xA03C88, 0xB0589C, 0xC070B0, 0xD084C0, 0xDC9CD0, 0xECB0E0, + 0x480078, 0x602090, 0x783CA4, 0x8C58B8, 0xA070CC, 0xB484DC, 0xC49CEC, 0xD4B0FC, + 0x140084, 0x302098, 0x4C3CAC, 0x6858C0, 0x7C70D0, 0x9488E0, 0xA8A0EC, 0xBCB4FC, + 0x000088, 0x1C209C, 0x3840B0, 0x505CC0, 0x6874D0, 0x7C8CE0, 0x90A4EC, 0xA4B8FC, + 0x00187C, 0x1C3890, 0x3854A8, 0x5070BC, 0x6888CC, 0x7C9CDC, 0x90B4EC, 0xA4C8FC, + 0x002C5C, 0x1C4C78, 0x386890, 0x5084AC, 0x689CC0, 0x7CB4D4, 0x90CCE8, 0xA4E0FC, + 0x003C2C, 0x1C5C48, 0x387C64, 0x509C80, 0x68B494, 0x7CD0AC, 0x90E4C0, 0xA4FCD4, + 0x003C00, 0x205C20, 0x407C40, 0x5C9C5C, 0x74B474, 0x8CD08C, 0xA4E4A4, 0xB8FCB8, + 0x143800, 0x345C1C, 0x507C38, 0x6C9850, 0x84B468, 0x9CCC7C, 0xB4E490, 0xC8FCA4, + 0x2C3000, 0x4C501C, 0x687034, 0x848C4C, 0x9CA864, 0xB4C078, 0xCCD488, 0xE0EC9C, + 0x442800, 0x644818, 0x846830, 0xA08444, 0xB89C58, 0xD0B46C, 0xE8CC7C, 0xFCE08C, + }; + + c = col[v >> 1]; + u.c[0] = c; + u.c[1] = c >> 8; + u.c[2] = c >> 16; + u.c[3] = 0xff; + p = (u32int *)pic + ppuy * PICW * scale + ppux * 2 * scale; + switch(scale){ + case 16: *p++ = u.l; *p++ = u.l; + case 15: *p++ = u.l; *p++ = u.l; + case 14: *p++ = u.l; *p++ = u.l; + case 13: *p++ = u.l; *p++ = u.l; + case 12: *p++ = u.l; *p++ = u.l; + case 11: *p++ = u.l; *p++ = u.l; + case 10: *p++ = u.l; *p++ = u.l; + case 9: *p++ = u.l; *p++ = u.l; + case 8: *p++ = u.l; *p++ = u.l; + case 7: *p++ = u.l; *p++ = u.l; + case 6: *p++ = u.l; *p++ = u.l; + case 5: *p++ = u.l; *p++ = u.l; + case 4: *p++ = u.l; *p++ = u.l; + case 3: *p++ = u.l; *p++ = u.l; + case 2: *p++ = u.l; *p++ = u.l; + default: *p++ = u.l; *p = u.l; + } +} + +static void +pixel(u8int v, int p, int s) +{ + if(p > pri){ + col = v; + pri = p; + } + disp |= 1<<s; +} + +static void +playfield(void) +{ + int x, p; + u8int c; + + x = ppux / 4; + if(x >= 20) + if((reg[CTRLPF] & 1) != 0) + x = 39 - x; + else + x = x - 20; + if(x < 4){ + if((reg[PF0] & 0x10<<x) == 0) + return; + }else if(x < 12){ + if((reg[PF1] & 0x800>>x) == 0) + return; + }else + if((reg[PF2] & 1<<x-12) == 0) + return; + if((reg[CTRLPF] & 6) == 2) + if(ppux < 80){ + c = reg[COLUP0]; + p = 3; + }else{ + c = reg[COLUP1]; + p = 2; + } + else{ + c = reg[COLUPF]; + p = (reg[CTRLPF] & 4) + 1; + } + pixel(c, p, SRCPF); +} + +static void +player(int n) +{ + u8int c; + int x; + + c = reg[GRP0 + n]; + x = ppux - (n ? p1x : p0x); + if(x < 0) + return; + switch(reg[NUSIZ0 + n] & 7){ + default: if(x >= 8) return; break; + case 1: if(x >= 8 && (x < 16 || x >= 24)) return; break; + case 2: if(x >= 8 && (x < 32 || x >= 40)) return; break; + case 3: if(x >= 40 || ((x & 15) >= 8)) return; break; + case 4: if(x >= 8 && (x < 64 || x >= 72)) return; break; + case 5: if(x >= 16) return; x >>= 1; break; + case 6: if(x >= 72 || ((x & 31) >= 8)) return; break; + case 7: if(x >= 32) return; x >>= 2; break; + } + x &= 7; + if((reg[REFP0 + n] & 8) == 0) + x ^= 7; + if((c & 1<<x) == 0) + return; + c = reg[COLUP0 + n]; + pixel(c, 3 - n, SRCP0 + n); +} + +static void +missile(int n) +{ + int x; + + x = ppux - (n ? m1x : m0x); + if((reg[RESMP0 + n] & 2) != 0){ + if(n) + m1x = p1x; + else + m0x = p0x; + return; + } + if(x < 0 || x >= 1<<(reg[NUSIZ0] >> 4 & 3) || (reg[ENAM0 + n] & 2) == 0) + return; + pixel(reg[COLUP0 + n], 3 - n, SRCM0 + n); +} + +static void +ball(void) +{ + int x; + + x = ppux - blx; + if(x < 0 || x >= 1<<(reg[CTRLPF] >> 4 & 3) || (reg[ENABL] & 2) == 0) + return; + pixel(reg[COLUPF], (reg[CTRLPF] & 4) + 1, SRCBL); +} + +void +tiastep(void) +{ + static u16int colltab[64] = { + 0x0000, 0x0000, 0x0000, 0x0020, 0x0000, 0x0080, 0x8000, 0x80a0, + 0x0000, 0x0200, 0x0001, 0x0221, 0x0002, 0x0282, 0x8003, 0x82a3, + 0x0000, 0x0800, 0x0008, 0x0828, 0x0004, 0x0884, 0x800c, 0x88ac, + 0x4000, 0x4a00, 0x4009, 0x4a29, 0x4006, 0x4a86, 0xc00f, 0xcaaf, + 0x0000, 0x2000, 0x0010, 0x2030, 0x0040, 0x20c0, 0x8050, 0xa0f0, + 0x0100, 0x2300, 0x0111, 0x2331, 0x0142, 0x23c2, 0x8153, 0xa3f3, + 0x0400, 0x2c00, 0x0418, 0x2c38, 0x0444, 0x2cc4, 0x845c, 0xacfc, + 0x4500, 0x6f00, 0x4519, 0x6f39, 0x4546, 0x6fc6, 0xc55f, 0xefff, + }; + + if(ppuy < PICH && ppux < 160){ + col = reg[COLUBK]; + pri = 0; + disp = 0; + playfield(); + player(0); + player(1); + missile(0); + missile(1); + ball(); + coll |= colltab[disp]; + pixeldraw(col); + } + if(ppux == 160) + nrdy = 0; + if(++ppux == 228){ + ppuy++; + ppux = 0; + } +} |