Mirai's Miscellaneous Misadventures

M47 / core / math.c

/* license: AGPLv3 or later */
/* copyright 2023 zamfofex */

#include <mimimi.h>

static signed char mimimi_sine_table[] = {0, 3, 6, 9, 12, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 57, 60, 63, 66, 68, 71, 73, 76, 78, 81, 83, 86, 88, 90, 92, 94, 97, 99, 101, 102, 104, 106, 108, 109, 111, 112, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 124, 125, 126, 126, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, 126, 126, 125, 124, 124, 123, 122, 121, 120, 119, 118, 117, 115, 114, 112, 111, 109, 108, 106, 104, 102, 101, 99, 97, 94, 92, 90, 88, 86, 83, 81, 78, 76, 73, 71, 68, 66, 63, 60, 57, 55, 52, 49, 46, 43, 40, 37, 34, 31, 28, 25, 22, 19, 16, 12, 9, 6, 3, 0, -3, -6, -9, -12, -16, -19, -22, -25, -28, -31, -34, -37, -40, -43, -46, -49, -52, -55, -57, -60, -63, -66, -68, -71, -73, -76, -78, -81, -83, -86, -88, -90, -92, -94, -97, -99, -101, -102, -104, -106, -108, -109, -111, -112, -114, -115, -117, -118, -119, -120, -121, -122, -123, -124, -124, -125, -126, -126, -127, -127, -127, -127, -127, -127, -127, -127, -127, -127, -127, -126, -126, -125, -124, -124, -123, -122, -121, -120, -119, -118, -117, -115, -114, -112, -111, -109, -108, -106, -104, -102, -101, -99, -97, -94, -92, -90, -88, -86, -83, -81, -78, -76, -73, -71, -68, -66, -63, -60, -57, -55, -52, -49, -46, -43, -40, -37, -34, -31, -28, -25, -22, -19, -16, -12, -9, -6, -3, 0, 3, 6, 9, 12, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 57, 60, 63, 66, 68, 71, 73, 76, 78, 81, 83, 86, 88, 90, 92, 94, 97, 99, 101, 102, 104, 106, 108, 109, 111, 112, 114, 115, 117, 118, 119, 120, 121, 122, 123, 124, 124, 125, 126, 126, 127, 127, 127, 127, 127};
static int mimimi_arc_tangent_table[] = {0,2,3,4,6,7,8,9,11,12,13,15,16,17,18,20,21,22,23,25,26,27,29,30,31,32,34,35,36,37,39,40,41,43,44,45,46,48,49,50,51,53,54,55,57,58,59,60,62,63,64,65,67,68,69,71,72,73,74,76,77,78,79,81,82,83,85,86,87,88,90,91,92,93,95,96,97,98,100,101,102,104,105,106,107,109,110,111,112,114,115,116,118,119,120,121,123,124,125,126,128,129,130,132,133,134,135,137,138,139,140,142,143,144,145,147,148,149,151,152,153,154,156,157,158,159,161,162,163,165,166,167,168,170,171,172,173,175,176,177,178,180,181,182,184,185,186,187,189,190,191,192,194,195,196,197,199,200,201,203,204,205,206,208,209,210,211,213,214,215,216,218,219,220,222,223,224,225,227,228,229,230,232,233,234,235,237,238,239,240,242,243,244,246,247,248,249,251,252,253,254,256,257,258,259,261,262,263,264,266,267,268,269,271,272,273,275,276,277,278,280,281,282,283,285,286,287,288,290,291,292,293,295,296,297,298,300,301,302,303,305,306,307,308,310,311,312,313,315,316,317,318,320,321,322,324,325,326,327,329,330,331,332,334,335,336,337,339,340,341,342,344,345,346,347,349,350,351,352,354,355,356,357,359,360,361,362,364,365,366,367,369,370,371,372,374,375,376,377,379,380,381,382,384,385,386,387,388,390,391,392,393,395,396,397,398,400,401,402,403,405,406,407,408,410,411,412,413,415,416,417,418,420,421,422,423,425,426,427,428,429,431,432,433,434,436,437,438,439,441,442,443,444,446,447,448,449,451,452,453,454,455,457,458,459,460,462,463,464,465,467,468,469,470,472,473,474,475,476,478,479,480,481,483,484,485,486,488,489,490,491,492,494,495,496,497,499,500,501,502,503,505,506,507,508,510,511,512,513,514,516,517,518,519,521,522,523,524,526,527,528,529,530,532,533,534,535,536,538,539,540,541,543,544,545,546,547,549,550,551,552,554,555,556,557,558,560,561,562,563,564,566,567,568,569,571,572,573,574,575,577,578,579,580,581,583,584,585,586,588,589,590,591,592,594,595,596,597,598,600,601,602,603,604,606,607,608,609,610,612,613,614,615,616,618,619,620,621,623,624,625,626,627,629,630,631,632,633,635,636,637,638,639,641,642,643,644,645,646,648,649,650,651,652,654,655,656,657,658,660,661,662,663,664,666,667,668,669,670,672,673,674,675,676,678,679,680,681,682,683,685,686,687,688,689,691,692,693,694,695,697,698,699,700,701,702,704,705,706,707,708,710,711,712,713,714,715,717,718,719,720,721,722,724,725,726,727,728,730,731,732,733,734,735,737,738,739,740,741,742,744,745,746,747,748,750,751,752,753,754,755,757,758,759,760,761,762,764,765,766,767,768,769,771,772,773,774,775,776,778,779,780,781,782,783,784,786,787,788,789,790,791,793,794,795,796,797,798,800,801,802,803,804,805,807,808,809,810,811,812,813,815,816,817,818,819,820,822,823,824,825,826,827,828,830,831,832,833,834,835,836,838,839,840,841,842,843,844,846,847,848,849,850,851,852,854,855,856,857,858,859,860,862,863,864,865,866,867,868,870,871,872,873,874,875,876,878,879,880,881,882,883,884,885,887,888,889,890,891,892,893,894,896,897,898,899,900,901,902,904,905,906,907,908,909,910,911,913,914,915,916,917,918,919,920,921,923,924,925,926,927,928,929,930,932,933,934,935,936,937,938,939,940,942,943,944,945,946,947,948,949,951,952,953,954,955,956,957,958,959,960,962,963,964,965,966,967,968,969,970,972,973,974,975,976,977,978,979,980,981,983,984,985,986,987,988,989,990,991,992,994,995,996,997,998,999,1000,1001,1002,1003,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067,1068,1069,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1086,1087,1088,1089,1090,1091,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,1117,1118,1119,1120,1121,1123,1124,1125,1126,1127,1128,1129,1130,1131,1132,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1200,1201,1202,1203,1204,1205,1206,1207,1208,1210,1211,1212,1213,1214,1215,1216,1217,1218,1219,1220,1221,1222,1223,1224,1225,1226,1227,1228,1229,1230,1231,1232,1233,1234,1235,1236,1237,1238,1239,1240,1241,1242,1243,1244,1245,1246,1247,1248,1249,1250,1251,1252,1253,1254,1255,1256,1257,1258,1259,1260,1261,1262,1263,1264,1265,1266,1267,1268,1269,1270,1271,1272,1273,1274,1275,1276,1277,1278,1279,1280,1281,1282,1283,1284,1285,1286,1287,1288,1289,1290,1291,1292,1293,1294,1295,1296,1297,1298,1299,1300,1301,1302,1303,1303,1304,1305,1306,1307,1308,1309,1310,1311,1312,1313,1314,1315,1316,1317,1318,1319,1320,1321,1322,1323,1324,1325,1326,1327,1328,1329,1330,1331,1332,1333,1334,1335,1336,1337,1338,1339,1340,1340,1341,1342,1343,1344,1345,1346,1347,1348,1349,1350,1351,1352,1353,1354,1355,1356,1357,1358,1359,1360,1361,1362,1363,1364,1364,1365,1366,1367,1368,1369,1370,1371,1372,1373,1374,1375,1376,1377,1378,1379,1380,1381,1382,1383,1384,1384,1385,1386,1387,1388,1389,1390,1391,1392,1393,1394,1395,1396,1397,1398,1399,1400,1401,1401,1402,1403,1404,1405,1406,1407,1408,1409,1410,1411,1412,1413,1414,1415,1415,1416,1417,1418,1419,1420,1421,1422,1423,1424,1425,1426,1427,1428,1429,1429,1430,1431,1432,1433,1434,1435,1436,1437,1438,1439,1440,1441,1441,1442,1443,1444,1445,1446,1447,1448,1449,1450,1451,1452,1453,1453,1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1463,1464,1465,1466,1467,1468,1469,1470,1471,1472,1473,1474,1474,1475,1476,1477,1478,1479,1480,1481,1482,1483,1483,1484,1485,1486,1487,1488,1489,1490,1491,1492,1493,1493,1494,1495,1496,1497,1498,1499,1500,1501,1501,1502,1503,1504,1505,1506,1507,1508,1509,1510,1510,1511,1512,1513,1514,1515,1516,1517,1518,1518,1519,1520,1521,1522,1523,1524,1525,1526,1526,1527,1528,1529,1530,1531,1532,1533,1533,1534,1535,1536,1537,1538,1539,1540,1541,1541,1542,1543,1544,1545,1546,1547,1548,1548,1549,1550,1551,1552,1553,1554,1555,1555,1556,1557,1558,1559,1560,1561,1561,1562,1563,1564,1565,1566,1567,1568,1568,1569,1570,1571,1572,1573,1574,1574,1575,1576,1577,1578,1579,1580,1581,1581,1582,1583,1584,1585,1586,1587,1587,1588,1589,1590,1591,1592,1593,1593,1594,1595,1596,1597,1598,1598,1599,1600,1601,1602,1603,1604,1604,1605,1606,1607,1608,1609,1610,1610,1611,1612,1613,1614,1615,1615,1616,1617,1618,1619,1620,1621,1621,1622,1623,1624,1625,1626,1626,1627,1628,1629,1630,1631,1631,1632,1633,1634,1635,1636,1636,1637,1638,1639,1640,1641,1641,1642,1643,1644,1645,1646,1646,1647,1648,1649,1650,1651,1651,1652,1653,1654,1655,1656,1656,1657,1658,1659,1660,1660,1661,1662,1663,1664,1665,1665,1666,1667,1668,1669,1670,1670,1671,1672,1673,1674,1674,1675,1676,1677,1678,1678,1679,1680,1681,1682,1683,1683,1684,1685,1686,1687,1687,1688,1689,1690,1691,1691,1692,1693,1694,1695,1696,1696,1697,1698,1699,1700,1700,1701,1702,1703,1704,1704,1705,1706,1707,1708,1708,1709,1710,1711,1712,1712,1713,1714,1715,1716,1716,1717,1718,1719,1720,1720,1721,1722,1723,1724,1724,1725,1726,1727,1727,1728,1729,1730,1731,1731,1732,1733,1734,1735,1735,1736,1737,1738,1739,1739,1740,1741,1742,1742,1743,1744,1745,1746,1746,1747,1748,1749,1750,1750,1751,1752,1753,1753,1754,1755,1756,1757,1757,1758,1759,1760,1760,1761,1762,1763,1764,1764,1765,1766,1767,1767,1768,1769,1770,1770,1771,1772,1773,1774,1774,1775,1776,1777,1777,1778,1779,1780,1780,1781,1782,1783,1784,1784,1785,1786,1787,1787,1788,1789,1790,1790,1791,1792,1793,1793,1794,1795,1796,1796,1797,1798,1799,1800,1800,1801,1802,1803,1803,1804,1805,1806,1806,1807,1808,1809,1809,1810,1811,1812,1812,1813,1814,1815,1815,1816,1817,1818,1818,1819,1820,1821,1821,1822,1823,1824,1824,1825,1826,1827,1827,1828,1829,1830,1830,1831,1832,1833,1833,1834,1835,1835,1836,1837,1838,1838,1839,1840,1841,1841,1842,1843,1844,1844,1845,1846,1847,1847,1848,1849,1849,1850,1851,1852,1852,1853,1854,1855,1855,1856,1857,1858,1858,1859,1860,1860,1861,1862,1863,1863,1864,1865,1866,1866,1867,1868,1868,1869,1870,1871,1871,1872,1873,1873,1874,1875,1876,1876,1877,1878,1879,1879,1880,1881,1881,1882,1883,1884,1884,1885,1886,1886,1887,1888,1889,1889,1890,1891,1891,1892,1893,1894,1894,1895,1896,1896,1897,1898,1899,1899,1900,1901,1901,1902,1903,1903,1904,1905,1906,1906,1907,1908,1908,1909,1910,1911,1911,1912,1913,1913,1914,1915,1915,1916,1917,1918,1918,1919,1920,1920,1921,1922,1922,1923,1924,1925,1925,1926,1927,1927,1928,1929,1929,1930,1931,1932,1932,1933,1934,1934,1935,1936,1936,1937,1938,1938,1939,1940,1940,1941,1942,1943,1943,1944,1945,1945,1946,1947,1947,1948,1949,1949,1950,1951,1951,1952,1953,1954,1954,1955,1956,1956,1957,1958,1958,1959,1960,1960,1961,1962,1962,1963,1964,1964,1965,1966,1966,1967,1968,1968,1969,1970,1970,1971,1972,1973,1973,1974,1975,1975,1976,1977,1977,1978,1979,1979,1980,1981,1981,1982,1983,1983,1984,1985,1985,1986,1987,1987,1988,1989,1989,1990,1991,1991,1992,1993,1993,1994,1995,1995,1996,1997,1997,1998,1999,1999,2000,2001,2001,2002,2003,2003,2004,2004,2005,2006,2006,2007,2008,2008,2009,2010,2010,2011,2012,2012,2013,2014,2014,2015,2016,2016,2017,2018,2018,2019,2020,2020,2021,2021,2022,2023,2023,2024,2025,2025,2026,2027,2027,2028,2029,2029,2030,2031,2031,2032,2032,2033,2034,2034,2035,2036,2036,2037,2038,2038,2039,2040,2040,2041,2041,2042,2043,2043,2044,2045,2045,2046,2047,2047,2048,2048};

signed char *mimimi_sine = mimimi_sine_table;
signed char *mimimi_cosine = mimimi_sine_table + 64;

int mimimi_div(int n, int q)
{
	if (n < 0) return (n + 1) / q - 1;
	if (n > 0) return (n - 1) / q + 1;
	return 0;
}

int mimimi_div_down(int n, int q)
{
	if (n > 0) return n / q;
	return mimimi_div(n, q);
}

int mimimi_div_up(int n, int q)
{
	return -mimimi_div_down(-n, q);
}

int mimimi_mod(int n, int q)
{
	return (n % q + q) % q;
}

static int mimimi_arc_tangent(int x)
{
	if (x < 0) return -mimimi_arc_tangent(-x);
	if (x > 2048) return 4096 - mimimi_arc_tangent(2048 * 2048 / x);
	return mimimi_arc_tangent_table[x];
}

int mimimi_angle(int y, int x)
{
	if (x > 0) return mimimi_arc_tangent(2048 * y / x);
	if (y > 0) return 4096 - mimimi_arc_tangent(2048 * x / y);
	if (y < 0) return -4096 - mimimi_arc_tangent(2048 * x / y);
	if (x < 0) return 8192 + mimimi_arc_tangent(2048 * y / x);
	return 0;
}