diff options
Diffstat (limited to 'src/util.c')
| -rw-r--r-- | src/util.c | 101 |
1 files changed, 0 insertions, 101 deletions
@@ -4239,107 +4239,6 @@ cptr get_player_race_name(int pr, int ps) return (buf); } -#ifdef SUPPORT_GAMMA - -/* Table of gamma values */ -byte gamma_table[256]; - -/* Table of ln(x / 256) * 256 for x going from 0 -> 255 */ -static const s16b gamma_helper[256] = -{ - 0, -1420, -1242, -1138, -1065, -1007, -961, -921, -887, -857, -830, - -806, -783, -762, -744, -726, -710, -694, -679, -666, -652, -640, - -628, -617, -606, -596, -586, -576, -567, -577, -549, -541, -532, - -525, -517, -509, -502, -495, -488, -482, -475, -469, -463, -457, - -451, -455, -439, -434, -429, -423, -418, -413, -408, -403, -398, - -394, -389, -385, -380, -376, -371, -367, -363, -359, -355, -351, - -347, -343, -339, -336, -332, -328, -325, -321, -318, -314, -311, - -308, -304, -301, -298, -295, -291, -288, -285, -282, -279, -276, - -273, -271, -268, -265, -262, -259, -257, -254, -251, -248, -246, - -243, -241, -238, -236, -233, -231, -228, -226, -223, -221, -219, - -216, -214, -212, -209, -207, -205, -203, -200, -198, -196, -194, - -192, -190, -188, -186, -184, -182, -180, -178, -176, -174, -172, - -170, -168, -166, -164, -162, -160, -158, -156, -155, -153, -151, - -149, -147, -146, -144, -142, -140, -139, -137, -135, -134, -132, - -130, -128, -127, -125, -124, -122, -120, -119, -117, -116, -114, - -112, -111, -109, -108, -106, -105, -103, -102, -100, -99, -97, -96, - -95, -93, -92, -90, -89, -87, -86, -85, -83, -82, -80, -79, -78, - -76, -75, -74, -72, -71, -70, -68, -67, -66, -65, -63, -62, -61, - -59, -58, -57, -56, -54, -53, -52, -51, -50, -48, -47, -46, -45, - -44, -42, -41, -40, -39, -38, -37, -35, -34, -33, -32, -31, -30, - -29, -27, -26, -25, -24, -23, -22, -21, -20, -19, -18, -17, -16, - -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1 -}; - - -/* - * Build the gamma table so that floating point isn't needed. - * - * Note gamma goes from 0->256. The old value of 100 is now 128. - */ -void build_gamma_table(int gamma) -{ - int i, n; - - /* - * value is the current sum. - * diff is the new term to add to the series. - */ - long value, diff; - - /* Hack - convergence is bad in these cases. */ - gamma_table[0] = 0; - gamma_table[255] = 255; - - for (i = 1; i < 255; i++) - { - /* - * Initialise the Taylor series - * - * value and diff have been scaled by 256 - */ - n = 1; - value = 256 * 256; - diff = ((long)gamma_helper[i]) * (gamma - 256); - - while (diff) - { - value += diff; - n++; - - /* - * Use the following identiy to calculate the gamma table. - * exp(x) = 1 + x + x^2/2 + x^3/(2*3) + x^4/(2*3*4) +... - * - * n is the current term number. - * - * The gamma_helper array contains a table of - * ln(x/256) * 256 - * This is used because a^b = exp(b*ln(a)) - * - * In this case: - * a is i / 256 - * b is gamma. - * - * Note that everything is scaled by 256 for accuracy, - * plus another factor of 256 for the final result to - * be from 0-255. Thus gamma_helper[] * gamma must be - * divided by 256*256 each itteration, to get back to - * the original power series. - */ - diff = (((diff / 256) * gamma_helper[i]) * (gamma - 256)) / (256 * n); - } - - /* - * Store the value in the table so that the - * floating point pow function isn't needed. - */ - gamma_table[i] = ((long)(value / 256) * i) / 256; - } -} - -#endif /* SUPPORT_GAMMA */ - /* * Ask to select an item in a list */ |