ref: c250669d2fda82fdf6e6ee5cdaeee477dd347eb1
dir: /snd.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
Dat *imfs;
Sfx *sfxs;
int sfxon, muson, pcmon;
int sfxlck;
enum{
Rate = 44100,
PcmHz = 7000,
ImfHz = 700,
SfxHz = 140,
Nsamp = Rate / ImfHz * 4,
Npsamp = Rate / PcmHz * 4,
Mdiv = ImfHz / Tb,
Pdiv = PcmHz / Tb,
Nbuf = Nsamp * Mdiv,
Rwse = 0x01,
Rnum = 0xa0,
Roct = 0xb0,
Ropm = 0xbd,
Rfed = 0xc0
};
/* channel 0, op 0-1 registers */
static uchar inst[] = {0x20, 0x23, 0x40, 0x43, 0x60, 0x63, 0x80, 0x83, 0xe0, 0xe3};
static uchar *sfxp, *sfxe, *pcm, *pcme, *imf;
static Sfx *sfxd, *pcmd;
static Dat *imfd;
static vlong stc, sdt, mdt;
static int sfd = -1;
static uchar sbuf[Nbuf];
static int h[] = { /* stolen property coefficients */
32767, 32766, 32764, 32760, 32755, 32749, 32741, 32731, 32721, 32708,
32695, 32679, 32663, 32645, 32625, 32604, 32582, 32558, 32533, 32506,
32478, 32448, 32417, 32385, 32351, 32316, 32279, 32241, 32202, 32161,
32119, 32075, 32030, 31984, 31936, 31887, 31836, 31784, 31731, 31676,
31620, 31563, 31504, 31444, 31383, 31320, 31256, 31191, 31124, 31056,
30987, 30916, 30845, 30771, 30697, 30621, 30544, 30466, 30387, 30306,
30224, 30141, 30057, 29971, 29884, 29796, 29707, 29617, 29525, 29433,
29339, 29244, 29148, 29050, 28952, 28852, 28752, 28650, 28547, 28443,
28338, 28232, 28125, 28017, 27908, 27797, 27686, 27574, 27461, 27346,
27231, 27115, 26998, 26879, 26760, 26640, 26519, 26398, 26275, 26151,
26027, 25901, 25775, 25648, 25520, 25391, 25262, 25131, 25000, 24868,
24735, 24602, 24467, 24332, 24197, 24060, 23923, 23785, 23647, 23507,
23368, 23227, 23086, 22944, 22802, 22659, 22515, 22371, 22226, 22081,
21935, 21789, 21642, 21494, 21346, 21198, 21049, 20900, 20750, 20600,
20449, 20298, 20146, 19995, 19842, 19690, 19537, 19383, 19230, 19076,
18922, 18767, 18612, 18457, 18302, 18146, 17990, 17834, 17678, 17521,
17365, 17208, 17051, 16894, 16737, 16579, 16422, 16264, 16106, 15949,
15791, 15633, 15475, 15317, 15159, 15001, 14843, 14685, 14527, 14369,
14212, 14054, 13896, 13739, 13581, 13424, 13266, 13109, 12952, 12795,
12639, 12482, 12326, 12170, 12014, 11858, 11703, 11548, 11393, 11238,
11084, 10929, 10776, 10622, 10469, 10316, 10164, 10011, 9860, 9708,
9557, 9407, 9256, 9106, 8957, 8808, 8659, 8511, 8364, 8216, 8070,
7924, 7778, 7633, 7488, 7344, 7200, 7057, 6914, 6773, 6631, 6490,
6350, 6210, 6071, 5933, 5795, 5658, 5521, 5385, 5250, 5115, 4981,
4848, 4716, 4584, 4452, 4322, 4192, 4063, 3935, 3807, 3680, 3554,
3429, 3304, 3180, 3057, 2935, 2813, 2692, 2572, 2453, 2335, 2217,
2101, 1985, 1870, 1755, 1642, 1529, 1418, 1307, 1197, 1088, 979, 872,
765, 660, 555, 451, 348, 246, 145, 44, -54, -153, -250, -347, -443,
-537, -631, -724, -816, -908, -998, -1087, -1175, -1263, -1349, -1435,
-1519, -1603, -1685, -1767, -1848, -1928, -2006, -2084, -2161, -2237,
-2312, -2386, -2459, -2531, -2603, -2673, -2742, -2810, -2878, -2944,
-3009, -3074, -3137, -3200, -3261, -3322, -3381, -3440, -3498, -3554,
-3610, -3665, -3719, -3772, -3824, -3875, -3925, -3974, -4022, -4069,
-4116, -4161, -4205, -4249, -4291, -4333, -4374, -4413, -4452, -4490,
-4527, -4563, -4599, -4633, -4666, -4699, -4730, -4761, -4791, -4820,
-4848, -4875, -4901, -4926, -4951, -4974, -4997, -5019, -5040, -5060,
-5080, -5098, -5116, -5133, -5149, -5164, -5178, -5192, -5205, -5217,
-5228, -5238, -5248, -5257, -5265, -5272, -5278, -5284, -5289, -5293,
-5297, -5299, -5301, -5303, -5303, -5303, -5302, -5300, -5298, -5295,
-5291, -5287, -5282, -5276, -5270, -5263, -5255, -5246, -5237, -5228,
-5217, -5206, -5195, -5183, -5170, -5157, -5143, -5128, -5113, -5097,
-5081, -5064, -5047, -5029, -5010, -4991, -4972, -4952, -4931, -4910,
-4889, -4867, -4844, -4821, -4797, -4774, -4749, -4724, -4699, -4673,
-4647, -4620, -4593, -4566, -4538, -4510, -4481, -4452, -4422, -4393,
-4363, -4332, -4301, -4270, -4238, -4206, -4174, -4142, -4109, -4076,
-4042, -4009, -3975, -3940, -3906, -3871, -3836, -3801, -3765, -3729,
-3693, -3657, -3620, -3584, -3547, -3510, -3472, -3435, -3397, -3360,
-3322, -3283, -3245, -3207, -3168, -3129, -3091, -3052, -3013, -2973,
-2934, -2895, -2855, -2816, -2776, -2736, -2697, -2657, -2617, -2577,
-2537, -2497, -2457, -2417, -2377, -2337, -2297, -2256, -2216, -2176,
-2136, -2096, -2056, -2016, -1976, -1936, -1896, -1856, -1817, -1777,
-1737, -1698, -1658, -1619, -1579, -1540, -1501, -1462, -1423, -1384,
-1345, -1306, -1268, -1230, -1191, -1153, -1115, -1077, -1040, -1002,
-965, -927, -890, -854, -817, -780, -744, -708, -672, -636, -600,
-565, -530, -494, -460, -425, -391, -356, -322, -289, -255, -222,
-189, -156, -123, -91, -59, -27, 4, 35, 66, 97, 127, 158, 188, 218,
247, 277, 306, 334, 363, 391, 419, 447, 474, 501, 528, 554, 581, 606,
632, 657, 683, 707, 732, 756, 780, 803, 827, 850, 872, 895, 917, 939,
960, 981, 1002, 1023, 1043, 1063, 1082, 1102, 1121, 1139, 1158, 1176,
1194, 1211, 1228, 1245, 1262, 1278, 1294, 1309, 1325, 1340, 1354,
1369, 1383, 1397, 1410, 1423, 1436, 1448, 1461, 1473, 1484, 1496,
1507, 1517, 1528, 1538, 1548, 1557, 1566, 1575, 1584, 1592, 1600,
1608, 1616, 1623, 1630, 1636, 1643, 1649, 1654, 1660, 1665, 1670,
1675, 1679, 1683, 1687, 1690, 1694, 1697, 1700, 1702, 1704, 1706,
1708, 1709, 1711, 1712, 1712, 1713, 1713, 1713, 1713, 1712, 1711,
1710, 1709, 1708, 1706, 1704, 1702, 1700, 1697, 1694, 1691, 1688,
1685, 1681, 1677, 1673, 1669, 1664, 1660, 1655, 1650, 1644, 1639,
1633, 1627, 1621, 1615, 1609, 1602, 1596, 1589, 1582, 1575, 1567,
1560, 1552, 1544, 1536, 1528, 1520, 1511, 1503, 1494, 1485, 1476,
1467, 1458, 1448, 1439, 1429, 1419, 1409, 1399, 1389, 1379, 1368,
1358, 1347, 1337, 1326, 1315, 1304, 1293, 1282, 1271, 1260, 1248,
1237, 1225, 1213, 1202, 1190, 1178, 1166, 1154, 1142, 1130, 1118,
1106, 1094, 1081, 1069, 1057, 1044, 1032, 1019, 1007, 994, 981, 969,
956, 943, 931, 918, 905, 892, 879, 867, 854, 841, 828, 815, 802, 790,
777, 764, 751, 738, 725, 713, 700, 687, 674, 662, 649, 636, 623, 611,
598, 585, 573, 560, 548, 535, 523, 510, 498, 486, 473, 461, 449, 437,
425, 413, 401, 389, 377, 365, 353, 341, 330, 318, 307, 295, 284, 272,
261, 250, 239, 228, 217, 206, 195, 184, 173, 163, 152, 141, 131, 121,
110, 100, 90, 80, 70, 60, 51, 41, 31, 22, 12, 3, -5, -14, -23, -32,
-41, -50, -59, -67, -76, -84, -93, -101, -109, -117, -125, -133, -140,
-148, -156, -163, -170, -178, -185, -192, -199, -206, -212, -219,
-226, -232, -239, -245, -251, -257, -263, -269, -275, -280, -286,
-291, -297, -302, -307, -312, -317, -322, -327, -332, -336, -341,
-345, -349, -354, -358, -362, -366, -369, -373, -377, -380, -384,
-387, -390, -394, -397, -400, -402, -405, -408, -411, -413, -416,
-418, -420, -422, -424, -426, -428, -430, -432, -433, -435, -436,
-438, -439, -440, -442, -443, -444, -445, -445, -446, -447, -447,
-448, -448, -449, -449, -449, -449, -449, -449, -449, -449, -449,
-449, -449, -448, -448, -447, -447, -446, -445, -444, -443, -443,
-442, -441, -440, -438, -437, -436, -435, -433, -432, -430, -429,
-427, -426, -424, -422, -420, -419, -417, -415, -413, -411, -409,
-407, -405, -403, -400, -398, -396, -393, -391, -389, -386, -384,
-381, -379, -376, -374, -371, -368, -366, -363, -360, -357, -355,
-352, -349, -346, -343, -340, -337, -334, -331, -328, -325, -322,
-319, -316, -313, -310, -307, -304, -301, -298, -294, -291, -288,
-285, -282, -278, -275, -272, -269, -265, -262, -259, -256, -252,
-249, -246, -243, -239, -236, -233, -230, -226, -223, -220, -217,
-213, -210, -207, -204, -200, -197, -194, -191, -187, -184, -181,
-178, -175, -172, -168, -165, -162, -159, -156, -153, -150, -147,
-143, -140, -137, -134, -131, -128, -125, -122, -120, -117, -114,
-111, -108, -105, -102, -99, -97, -94, -91, -88, -86, -83, -80, -78,
-75, -72, -70, -67, -65, -62, -59, -57, -55, -52, -50, -47, -45, -43,
-40, -38, -36, -33, -31, -29, -27, -25, -22, -20, -18, -16, -14, -12,
-10, -8, -6, -4, -2, 0, 0, 2, 4, 6, 8, 9, 11, 13, 14, 16, 17, 19, 21,
22, 24, 25, 27, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40, 41, 42, 43,
44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59,
59, 60, 61, 62, 62, 63, 63, 64, 64, 65, 66, 66, 66, 67, 67, 68, 68,
69, 69, 69, 70, 70, 70, 70, 71, 71, 71, 71, 71, 72, 72, 72, 72, 72,
72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72, 72,
72, 71, 71, 71, 71, 71, 70, 70, 70, 70, 69, 69, 69, 69, 68, 68, 68,
67, 67, 67, 66, 66, 66, 65, 65, 64, 64, 64, 63, 63, 62, 62, 62, 61,
61, 60, 60, 59, 59, 58, 58, 58, 57, 57, 56, 56, 55, 55, 54, 54, 53,
53, 52, 52, 51, 51, 50, 50, 49, 48, 48, 47, 47, 46, 46, 45, 45, 44,
44, 43, 43, 42, 42, 41, 41, 40, 39, 39, 38, 38, 37, 37, 36, 36, 35,
35, 34, 34, 33, 33, 32, 32, 31, 31, 30, 30, 29, 29, 28, 28, 27, 27,
26, 26, 25, 25, 24, 24, 23, 23, 23, 22, 22, 21, 21, 20, 20, 20, 19,
19, 18, 18, 17, 17, 17, 16, 16, 15, 15, 15, 14, 14, 14, 13, 13, 12,
12, 12, 11, 11, 11, 10, 10, 10, 9, 9, 9, 9, 8, 8, 8, 7, 7, 7, 7, 6, 6,
6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1,
1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
enum{
Nl = 8, /* 2^Nl samples per zero crossing in fir */
Nη = 8, /* phase bits for filter interpolation */
Np = Nl+Nη, /* phase bits (fract of fixed point) */
TΔ = ((uvlong)PcmHz<<Np) / Rate,
One = 1<<Np,
LΔ = 1<<Np,
Le = nelem(h)<<Nη,
Lscale = 13128,
Nextra = 1 + (Le / LΔ),
Npbuf = Nextra*2 + (Nsamp - 1)
};
static int hΔ[nelem(h)], xb[Npbuf], xbi;
static ulong xt;
static u8int ratt[][30] = {
{8,8,8,8,8,8,8,7,7,7,7,7,7,6,0,0,0,0,0,1,3,5,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,7,7,7,7,7,6,4,0,0,0,0,0,2,4,6,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,7,7,7,7,6,6,4,1,0,0,0,1,2,4,6,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,7,7,7,7,6,5,4,2,1,0,1,2,3,5,7,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,7,7,7,6,5,4,3,2,2,3,3,5,6,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,7,7,7,6,6,5,4,4,4,4,5,6,7,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,7,7,7,6,6,5,5,5,6,6,7,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,7,7,7,6,6,7,7,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8}
}, latt[][30] = {
{8,8,8,8,8,8,8,8,5,3,1,0,0,0,0,0,6,7,7,7,7,7,7,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,6,4,2,0,0,0,0,0,4,6,7,7,7,7,7,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,6,4,2,1,0,0,0,1,4,6,6,7,7,7,7,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,7,5,3,2,1,0,1,2,4,5,6,7,7,7,7,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,6,5,3,3,2,2,3,4,5,6,7,7,7,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,7,6,5,4,4,4,4,5,6,6,7,7,7,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,7,6,6,5,5,5,6,6,7,7,7,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,7,7,6,6,7,7,7,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8},
{8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8}
};
static int atton, attx, atty, lvol, rvol;
static void
stopal(void)
{
if(sfxd == nil)
return;
opl2wr(Roct, 0);
sfxp = sfxe = nil;
sfxd = nil;
}
static void
imfcmd(void)
{
int r, v, dt;
uchar *u;
dt = 0;
while(dt == 0){
u = imf;
r = u[0];
v = u[1];
dt = u[3]<<8 | u[2];
opl2wr(r, v);
imf += 4;
if(imf >= imfd->e)
imf = imfd->p;
}
mdt = stc + dt;
}
static void
alcmd(void)
{
int v;
if(sfxp >= sfxe){
stopal();
return;
}
v = *sfxp++;
if(v != 0){
opl2wr(Rnum, v);
opl2wr(Roct, sfxd->blk);
}else
opl2wr(Roct, 0);
sdt = stc + ImfHz / SfxHz;
}
/* this spins constantly even when there's no music being played continuously,
* in essence only because some sound effects need an echo to play correctly.
* it sucks. */
static int
opl2step(void)
{
uchar *p;
if(!muson && !sfxon)
return -1;
p = sbuf;
while(p < sbuf + sizeof sbuf){
if(stc == sdt && sfxd != nil)
alcmd();
if(stc == mdt && imfd != nil)
imfcmd();
p = opl2out(p, Nsamp);
stc++;
}
return 0;
}
/* stolen property cargocult upsampling */
static void
filter(uchar *s)
{
ulong l, p, i;
int *x, o, a;
s16int m;
vlong v;
v = 0;
x = &xb[xt>>Np]; /* left side */
l = p = xt & (1<<Np)-1;
while(l < Le){
i = l >> Nη;
a = ((int)(l & (1<<Nη)-1) * hΔ[i] >> Nη) + h[i];
v += (vlong)*(--x) * a;
l += LΔ;
}
x = &xb[xt>>Np]; /* right side */
l = One-p & (1<<Np)-1;
if(l == 0) /* h[0] was already summed above if p == 0 */
l += LΔ;
while(l < Le){
i = l >> Nη;
a = ((int)(l & (1<<Nη)-1) * hΔ[i] >> Nη) + h[i];
v += (vlong)*x++ * a;
l += LΔ;
}
v >>= 2; /* scale */
v *= Lscale;
v >>= 27;
m = s[0] | s[1] << 8;
o = (s32int)(v >> 16) * lvol / 16 + m;
if(o > 32767)
o = 32767;
else if(o < -32768)
o = -32768;
s[0] = o;
s[1] = o >> 8;
o = (s32int)(v >> 16) * rvol / 16 + m;
if(o > 32767)
o = 32767;
else if(o < -32768)
o = -32768;
s[2] = o;
s[3] = o >> 8;
}
static void
resample(uchar *p, int n)
{
int i, s;
uchar *b;
ulong e;
b = sbuf;
more:
do{
for(i=xbi; n>0 && i<Npbuf; n--, i++)
xb[i] = ((uint)*p++ << 24) - 0x7fffffff;
xbi = i;
if(i < 2 * Nextra) /* minimum for filter */
break;
e = i - Nextra << Np;
while(xt < e){ /* process buffer and mix */
if(b >= sbuf + nelem(sbuf)){
n = 0;
break;
}
filter(b);
b += 4;
xt += TΔ;
}
e = xt >> Np;
if(e >= Npbuf - Nextra){ /* wrap at eob */
xt = xt - (e << Np) + (Nextra << Np);
s = (xt >> Np) - Nextra;
e -= Nextra;
i -= e;
if(i > 0){
memmove(xb + s, xb + e, i * sizeof i);
s += i;
}
xbi = s;
}
}while(n > 0);
if(b < sbuf + nelem(sbuf) && p < pcme){
n += (b - sbuf) / Npsamp;
goto more;
}
pcm = p;
}
static void
setvol(void)
{
int x, y, ax, ay;
s32int f;
if(!atton){
lvol = rvol = 16;
return;
}
ax = attx - vw.x;
ay = atty - vw.y;
f = ffs(ax, vw.cos);
x = f - ffs(ay, vw.sin) >> Dtlshift;
f = ffs(ax, vw.sin);
y = f + ffs(ay, vw.cos) >> Dtlshift;
if(x < 0)
x = -x;
if(x >= nelem(latt))
x = nelem(latt) - 1;
if(y < -nelem(latt))
y = -nelem(latt);
else if(y >= nelem(latt))
y = nelem(latt) - 1;
lvol = 16 - latt[x][nelem(latt)+y];
rvol = 16 - ratt[x][nelem(latt)+y];
}
static void
pcmstep(void)
{
uchar *e, *p;
p = pcm;
e = pcme;
if(p == e)
return;
if(p + Pdiv < e)
e = p + Pdiv;
setvol();
resample(p, e-p);
}
void
sndstep(void)
{
if(sfd < 0)
return;
if(opl2step() < 0){
if(!pcmon)
return;
memset(sbuf, 0, sizeof sbuf);
}
pcmstep();
if(!nosleep)
write(sfd, sbuf, sizeof sbuf);
}
void
stopsfx(void)
{
if(sfd < 0)
return;
stopal();
pcm = pcme = nil;
pcmd = nil;
}
int
lastsfx(void)
{
if(pcm < pcme)
return pcmd - sfxs;
else if(sfxd != nil)
return sfxd - sfxs;
return -1;
}
void
sfxatt(int n, int att, int x, int y)
{
Sfx *s;
uchar *r, *i;
if(sfd < 0 || sfxlck)
return;
s = sfxs+n;
if(pcmon && s->pcm != nil){
if(pcm < pcme && s->pri < pcmd->pri)
return;
pcmd = s;
pcm = s->pcm->p;
pcme = s->pcm->e;
xbi = Nextra;
xt = Nextra << Np;
if(atton = att){
attx = x;
atty = y;
}
}else if(sfxon){
if(sfxd != nil && s->pri < sfxd->pri)
return;
stopal();
sfxd = s;
sfxp = s->p;
sfxe = s->e;
sdt = stc;
i = s->inst;
r = inst;
while(r < inst + sizeof inst)
opl2wr(*r++, *i++);
}
}
void
sfx(int n)
{
sfxatt(n, 0, 0, 0);
}
void
stopmus(void)
{
int i;
if(sfd < 0)
return;
stopsfx();
if(!muson && !sfxon)
return;
for(i=Roct+1; i<Roct+9; i++)
opl2wr(i, 0);
imf = nil;
imfd = nil;
}
void
mus(int n)
{
Dat *d;
d = imfs+n;
if(sfd < 0 || !muson || d == imfd)
return;
stopmus();
mdt = stc;
imfd = d;
imf = d->p;
}
void
initsnd(void)
{
int n, fd;
fd = open("/dev/audio", OWRITE);
if(fd < 0){
fprint(2, "initsnd: %r\n");
return;
}
opl2init(Rate);
opl2wr(Rwse, 0x20);
opl2wr(Ropm, 0);
opl2wr(Rfed, 0);
for(n=0; n<nelem(hΔ)-1; n++)
hΔ[n] = h[n+1] - h[n];
sfd = fd;
}